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Other than first group moves for focusing (internal focus type)

Subclass of:

359 - Optical: systems and elements

359642000 - LENS

359676000 - With variable magnification (e.g., zoom type)

359683000 - With mechanical compensation

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DocumentTitleDate
20100007966Zoom lens and image pickup apparatus equipped with same - A zoom lens includes, in order from the object side thereof, a first lens unit having a positive refracting power, which is movable during zooming, a second lens unit having a negative refracting power, which is movable during zooming, a third lens unit having a positive refracting power, which is movable during zooming, a fourth lens unit having a positive refracting power, which is movable during zooming, a fifth lens unit having a positive refracting power, which is movable or stationary during zooming. The zoom lens further includes an aperture stop that moves integrally with the third lens unit during zooming. The first lens unit is located closer to the object side at the telephoto end than at the wide angle end, and the third lens unit is located closer to the object side at the telephoto end than at the telephoto end. The first lens unit is composed of only one cemented lens made up of a negative lens element and a positive lens element arranged in order from the object side, and the third lens unit includes at least two positive lens elements. The zoom lens satisfies a certain condition.01-14-2010
20120176685REFRACTIVE, VARIABLE MAGNIFICATION OPTICAL SYSTEM - A refractive, variable magnification optical system comprising, sequentially from a side nearest an object, a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a fourth lens group having a positive refractive power. The first lens group includes sequentially from the side nearest the object, a negative meniscus lens having a convex surface facing toward the object, a prism that refracts an optical path, a plano-convex lens, and a biconvex lens, a light transmitting surface of the prism and the plano-convex lens being cemented. The third lens group 07-12-2012
20100073778ZOOM LENS, CAMERA DEVICE AND PERSONAL DIGITAL ASSISTANT - A zoom lens including, in order from an object side to an image side, a first group having a negative focal length, a second group having a positive focal length, a third group having a negative focal length, a fourth group having a positive focal length, and an aperture stop between the second group and the third group, wherein when changing a magnification from a short focus end to a long focus end, at least the second group monotonically moves from the image side to the object side such that a distance between the first group and the second group decreases, and a distance between the second group and the third group increases, and the third group includes a three-cemented lens having a negative lens, a positive lens and a negative lens in order from the object side.03-25-2010
20130033759ZOOM LENS AND INFORMATION DEVICE INCORPORATING THE SAME - A zoom lens includes first to fifth lens groups having positive, negative, negative, positive, and positive refractive power, respectively. The third lens group includes a single negative meniscus lens with a concave surface on an object side, to move along the optical axis for focusing. When zooming from a wide angle end to a telephoto end, an interval between the first and second lens groups increases, an interval between the second and third lens groups increases, an interval between the third and fourth lens groups decreases, and an interval between the fourth and fifth lens groups decreases. The fourth and fifth lens groups are set to have a combined lateral magnification β02-07-2013
20100046085LENS BARREL AND IMAGING DEVICE - An interchangeable lens unit comprises a second lens group unit, a focus lens unit, a fourth lens group unit, a zoom ring unit, and a focus motor. The zoom ring unit mechanically transmits operational force inputted to a zoom ring to the second lens group unit and the fourth lens group unit. The focus motor electrically drives the focus lens unit in the Z axis direction with respect to the second lens group unit. When the zoom ring is operated in a state in which no power is being supplied to the focus motor, a gap is always ensured in the Z axis direction between the focus lens unit and the second lens group unit.02-25-2010
20130088786ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME - A zoom lens includes a lens unit Ln having negative refractive power including two or less lenses moving during focusing and zooming, a lens unit Lp04-11-2013
20100128361Zoom lens and image pickup apparatus equipped with same - A zoom lens includes, in order from the object side thereof, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a positive refracting power, a fourth lens unit having a positive refracting power, and a fifth lens unit having a negative refracting power. During zooming from the wide angle end to the telephoto end, the first lens unit and the third lens unit are kept stationary with respect to the image plane, and at least the second lens unit and the fourth lens unit move. The first lens unit includes, in order from the object side, a first sub unit having a negative refracting power, a reflecting optical element that bends an optical path by reflection, and a second sub unit having a positive refracting power. The second sub unit includes a cemented lens.05-27-2010
20100134900ZOOM LENS AND IMAGING APPARATUS - A zoom lens is provided and includes: a first lens group having a positive power, a second lens group having a negative power, a stop, a third lens group having a positive power, and a fourth lens group having a positive power in order. Zooming is performed by moving at least the first lens group, the second lens group, the stop, and the third lens group along the optical axis. During zooming, the stop is moved so as to be closer to an image plane at a wide-angle end than at a telephoto end and to be closer to the second lens group at the telephoto end than at the wide-angle end. The following conditional expressions (1) and (2) are satisfied. For the conditional expressions (1) and (2), fw is a focal length at the wide-angle end of the entire system, ft is a focal length at the telephoto end of the entire system, f06-03-2010
20090091842REAR-FOCUSING TYPE ZOOM LENS AND IMAGING APPARATUS - A rear-focusing type zoom lens includes in order from an object side: a positive first group that is fixed, a negative second group that is moved toward an image plane along an optical axis during zooming from a wide-angle end to a telephoto end, a negative third group that is fixed in an optical axis direction, and a positive fourth group that moves along the optical axis direction to correct image plane variation, which is caused by the zooming, and to perform focusing. The first group includes a first subgroup having a negative refractive power as a whole and a second subgroup having a positive refractive power as a whole. The first subgroup includes, in order from the object side, a negative meniscus lens having a convex surface directed toward the object side, a first negative lens, a positive lens, and a second negative lens.04-09-2009
20090091841ZOOM LENS, IMAGING DEVICE, AND PERSONAL DIGITAL ASSISTANT - The invention provides a zoom lens including at least a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, in order from an object side, and an aperture stop between the second lens group and the third lens group, wherein, in changing magnification from a wide angle end toward a telephoto end, at least the first lens group and the third lens group move toward the object side so as to increase a spacing between the first lens group and the second lens group, and to decrease a spacing between the second lens group and the third lens group.04-09-2009
20130163094Objective Optical System and Observation Apparatus Provided with the Same - An objective optical system of an embodiment according to the present invention is formed in such a way that: the objective optical system includes an immovable lens group which is arranged nearest to the object side, which is immovable in focusing, and which has negative power, and first and second movable lens groups at least one of which moves along the optical axis in focusing; and an amount of variation in magnification per movement of the first movable lens group is different from an amount of variation in magnification per movement of the second movable lens group.06-27-2013
20090046374Zoom lens and imaging apparatus - A zoom lens and an imaging apparatus are disclosed. The zoom lens includes, in order from an object side to an image-plane side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power. During a change of a lens zoom position from a maximum wide angle state to a maximum telephoto state, at least the second lens group moves toward an image side, the third lens group moves toward an object side, and the fourth lens group is fixed in an optical-axis direction. An aperture stop is disposed near the object side of the third lens group. The first to fifth lens groups satisfy predetermined conditions.02-19-2009
20110279907Zoom lens and image pickup apparatus - A zoom lens and an image pickup apparatus are disclosed. The zoom lens includes, in order from an object side to an image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power. The fifth lens group includes a fixed group having a negative refractive power, and a movable group having a positive refractive power and being movable in a direction substantially orthogonal to the optical axis. The image formed on an image surface is movable in a direction substantially orthogonal to the optical axis by moving the movable group of the fifth lens group in the direction substantially orthogonal to the optical axis. The fifth lens group is satisfied predetermined conditions.11-17-2011
20110299176MINIATURE ZOOM LENS - A Miniature zoom lens, in particular for use in mobile telephones, in which the zoom lens, as viewed from the object plane, has the following in the stated sequence: at least one negative first optical lens group, at least one negative second optical lens group, at least one positive third optical lens group, and at least one positive fourth optical lens group. The second, third, and fourth optical lens groups are configured in such a way that focusing is achieved solely by displacement of the fourth optical lens group, and during the focusing the positions of the second and third lens groups remain unchanged.12-08-2011
20110286106ENHANCED VARIABLE POWER ZOOM LENS - The present invention is directed to provide an enhanced variable power zoom lens that has focusing lens optics reduced in weight so as to relieve of a load on a focusing drive system, and that has its anti-vibration lens optics reduced in both diameter and weight so as to relieve of a load on an anti-vibration drive system and downsize the same. The enhanced variable power zoom lens is adapted to have the foremost or first lens group G11-24-2011
20110286107ENHANCED VARIABLE POWER ZOOM LENS - An enhanced variable power zoom lens is lightweight in whole and in part, especially, having its focusing lens optics reduced in weight so as to relieve of a load on a focusing drive system, and having its anti-vibration lens optics reduced in both diameter and weight so as to relieve of a load on an anti-vibration drive system and downsize the same. The zoom lens has the foremost or first lens group of positive refractivity, the second lens group of negative refractivity, the third lens group of positive refractivity, the fourth lens group of negative refractivity, and the fifth lens group arranged in sequence from a position closer to the object. The fourth lens group moves toward the image plane for focusing on from the infinity to a proximity object while part of the third lens group moves orthogonal to the optical axis for shifting an image.11-24-2011
20110299175Zoom optical system, and imaging apparatus incorporating the same - The invention provides a zoom optical system comprising at least three lens groups and designed to implement zooming by varying a separation between the respective lens groups. The zoom optical system includes, on an image plane side with respect to a stop, a lens group comprising a plurality of lenses and having positive refracting power throughout. The lens group having positive refracting power includes an air double-convex positive lens in it.12-08-2011
20090147375ZOOM LENS, IMAGING APPARATUS, AND PERSONAL DATA ASSISTANT - A zoom lens includes a first optical system having a positive focal length, the first optical system, a second optical system having a negative focal length, a third optical system having a positive focal length, a fourth optical system having a negative focal length, and a fifth optical system having a positive focal length, which are arranged in order from an object side to an image side and an aperture stop provided at an object side of the third optical system. The following condition is satisfied:06-11-2009
20080204893Small refractive zoom lens optical system - Disclosed is a zoom lens optical system including: a first lens group that is provided close to an object, has a negative refractive power in total, and includes an optical part having a surface that reflects light; a second lens group that has a negative refractive power in total; an iris; a third lens group that has a positive refractive power in total; and a fourth lens group that has a positive refractive power in total. At least one of the second lens group, the third lens group, and the fourth lens group is moved to vary magnification. The second lens group is moved to perform focus adjustment when a distance to an object is changed between a long distance to a short distance, and the distance from a first lens of the first lens group to an imaging surface is fixed even when the lens moves during a change in magnification and the focus adjustment.08-28-2008
20100033838HIGH ZOOM-RATIO ZOOM LENS SYSTEM - A high zoom-ratio zoom lens system of five lens groups includes a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a negative fifth lens group, in this order from the object.02-11-2010
20090190234ZOOM LENS AND OPTICAL APPARATUS AND METHOD FOR MANUFACTURING THEREOF - A zoom lens includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, which are disposed in order from an object along the optical axis, wherein the third lens group comprises: a pre-group, which has a first positive lens, a negative meniscus lens having a convex surface facing the object, a second positive lens, and which has a positive refractive power; and a negative meniscus lens having a convex surface facing the object, which are disposed in order from the object; at least one of three surfaces of an object side and image side lens surfaces of the first positive lens and an object side lens surface of the negative meniscus lens is aspherical; and at least one of three surfaces of an object side lens surface of the second positive lens, and an object side and image side lens surfaces of the negative meniscus lens is aspherical.07-30-2009
20100123957ZOOM LENS AND IMAGING APPARATUS - A first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having the negative refractive power, and a fourth lens group having the positive refractive power are included in order from an object side, and variation of magnification from a wide-angle end to a telephoto end is performed by monotonically moving the second lens group toward an image side and compensation of a fluctuation of an image surface resulting from the variation of magnification is performed by moving the third lens group. At least one positive lens having an optical material satisfying a conditional expressions is included in at least one of the first lens group G1 and the fourth lens group.05-20-2010
20120033308COMPACT ZOOM LENS - A zoom lens includes: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a positive refractive power and including one piece of positive lens; and a fourth lens group having a negative refractive power, wherein the first, second, third, and fourth lens groups are sequentially disposed in an order from an object side to an image surface side of the zoom lens, all distances between adjacent lens groups change and the third lens group performs focusing while zooming from a wide angle position to a telephoto position, and a following condition is satisfied: 0<(L02-09-2012
20090207501ZOOM LENS AND IMAGING DEVICE HAVING THE SAME - A zoom lens including, in an order from an object side to an image side, a first lens group having a positive refracting power, a second lens group having a negative refracting power, a rear group including at least one lens group, the zooming operation being performed by changing a spacing of the lens groups, wherein the zoom lens has an aperture stop and, when the second lens group is taken as a first focus group and a sub-lens group constituting a portion of one lens group of the rear group is taken as a second focus group, the lens structure and the movement amount of the first and second focus groups are set appropriately.08-20-2009
20110199689OPTICAL SYSTEM AND OPTICAL APPARATUS - The optical system includes first (positive) and second (negative) lens units arranged in order from an object side to an image side, and an aperture stop disposed further on the image side than the second lens unit. The first lens unit includes at least one first optical element satisfying φGH>0.0, υdGH<39.5 and ndGH>1.70. The optical system satisfies 0.65<|φ08-18-2011
20090147374Rear focusing zoom lens - Rear focusing zoom lens capable of attaining the desired brightness as much as 1.8 in F-number with the zooming ratio of 11× or above, reducing distortion aberration for the photoshooting at the wide-angle end, compensating for axial chromatic aberration and chromatic aberration at the telephoto end, minimizing a diameter of the leading lens piece and the entire length of the lens optics, satisfying a requirement of the reduced weight06-11-2009
20090273846ZOOM LENS SYSTEM AND IMAGING APPARATUS - A positive first lens group G11-05-2009
20090284842ZOOM LENS SYSTEM - A zoom lens system includes, in order from an object side to an image side, first to fifth lens group respectively having positive, negative, positive, positive, and positive refractive power. When zooming from a wide-angle end to a telephoto end, the first, third and fourth lens groups move to the object side and the second lens group moves to the image side, whereby a spacing between the first and second lens groups and a spacing between the fourth and fifth lens groups are both increased and a spacing between the second and third lens groups is decreased. The following condition is satisfied:11-19-2009
20110170202ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes a negative first lens-group, a positive second lens-group, and a positive third lens-group, sequentially arranged from the object side. The focal length magnification of the zoom lens is changeable by changing a distance between the lens-groups. The first lens-group is composed of a negative first lens, the image side of which is concave, and a positive second lens that is an aspheric plastic lens. The second lens-group is composed of a cemented lens and a meniscus-form fifth lens having a convex surface facing the object side. The cemented lens is composed of a double-convex-form positive third lens and a double-concave-form negative fourth lens. The third lens-group is composed of a positive sixth lens, which is a single lens. Formula (1) about focal length fG2 of the second lens-group and focal length fw of the entire system at wide end is satisfied:07-14-2011
20090296230ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - Provided is a zoom lens including in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power, each of the first lens unit, the second lens unit, the third lens unit, and fourth lens unit moving to perform zooming, in which M12-03-2009
20090002842ZOOM LENS, IMAGE PICKUP APPARATUS AND DIGITAL EQUIPMENT - A zoom lens includes, in order from an object side thereof: a first lens group having a negative optical power and comprising a reflection optical element; a second lens group having a positive optical power; a third lens group having a negative optical power; a fourth lens group having a positive optical power; and, a fifth lens group. The first lens group and the fourth lens group are positioned at a fixed distance and at least the second lens group, the third lens group and the fifth lens group move along an optical axis, for varying a power of the zoom lens from a wide-angle end to a telephoto end. The zoom lens satisfies a predetermined expression relating to a focal length of the first lens group, and a focal length of the zoom lens at the wide-angle end.01-01-2009
20090002841ZOOM LENS SYSTEM, OPTICAL APPARATUS, AND METHOD FOR ZOOMING - Providing a zoom lens system having excellent optical performance, an optical apparatus, and a method for zooming the zoom lens system. The zoom lens system includes, in order from an object, a first lens group G01-01-2009
20110205636ZOOM LENS SYSTEM, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING ZOOM LENS SYSTEM - A zoom lens system includes, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a position of the first lens group is fixed. At least a portion of any one of the lens groups is moved in a direction including a component perpendicular to an optical axis, and a given conditional expression is satisfied, thereby providing a zoom lens system capable of excellently suppressing variation in aberrations upon zooming and upon correcting an image blur, an optical apparatus including the zoom lens system, and a method for manufacturing the zoom lens system.08-25-2011
20090168193Zoom lens and imaging apparatus - A zoom lens configured by arranging a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group in order from the object side to the image side, and further having an aperture diaphragm on the object side of the third lens group. In the first lens group, a first lens, a second lens, and a third lens are located in order from the object side to the image side. In the second lens group, a fourth lens, a fifth lens, and a sixth lens are located in order from the object side to the image side. The third lens group is made up of a seventh lens which is a convex lens, the fourth lens group is made up of at least two or more cemented lenses, the third lens group and the fourth lens group include at least one surface formed into an aspherical surface.07-02-2009
20080291545Zoom lens - The invention relates to a zoom lens that can achieve higher performance easily. In order from the object side of the zoom lens, it comprises a positive first lens group G11-27-2008
20080304163Three-unit zoom lens system and image pickup apparatus having three-unit zoom lens system - A three-unit zoom lens system includes in order from an object side thereof, a first lens unit having a negative refracting power, a second lens unit having a positive refracting power, and a third lens unit having a refracting power. The first lens unit includes a biconcave negative lens component nearest to the object side, and the biconcave negative lens component is the only negative lens component in the first lens unit. The second lens unit includes a cemented lens component which includes in order from the object side thereof, at least three lenses cemented mutually on an optical axis, namely a first positive lens, a negative lens, and a second positive lens. A surface on the image side of the negative lens is a concave surface, and the negative lens has an Abbe's number smaller than the Abbe's number for the first positive lens and the second positive lens, and has a refractive index higher than a refractive index of the second positive lens. The third lens unit includes one lens component, and satisfies predetermined conditional expressions.12-11-2008
20120293872Zoom Lens with Bent Optical Path and Image Pickup Apparatus Using the Same - A zoom lens with a bent optical path comprising, in order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a rear lens unit group having a positive refractive power as a whole. The first lens unit includes a reflecting member. The rear lens unit group includes three lens unit including, in order from the object side to the image side, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The distances between the lens units change during zooming from the wide angle end to the telephoto end. The zoom lens satisfies the predetermined conditional expressions.11-22-2012
20110007403ZOOM OPTICAL SYSTEM, OPTICAL APPARATUS EQUIPPED THEREWITH AND METHOD FOR MANUFACTURING THE ZOOM OPTICAL SYSTEM - Composing a zoom optical system ZL, in order from an object side, a first lens group G01-13-2011
20110205635ZOOM LENS ASSEMBLY - This invention provides a zoom lens assembly in order from an object side toward an image side including a first lens group with negative refractive power, a second lens group with positive refractive power and a third lens group with positive refractive power. The first lens group has only two lenses with refractive power from an object side toward an image side in order including a first lens with negative refractive power and a second lens with negative refractive power. The second lens group from an object side toward an image side in order includes an aperture stop, a third lens and a fourth lens. The third lens group includes a fifth lens. The number of the lens with refractive power in the zoom lens assembly is N, which satisfies the condition of 5≦N≦7, and the lens with refractive power in the zoom lens assembly includes at least three aspheric-surface lens.08-25-2011
20120069451ZOOM LENS SYSTEM AND ELECTRONIC IMAGING APPARATUS - A zoom lens system includes a negative first lens group, a positive second lens group and a positive third lens group, in that order from the object side, wherein upon zooming from the short to long focal length extremities, the distance between the first and second lens groups decreases, and the distance between the second and third lens groups increases. The first lens group includes a negative lens element and a positive lens element; and the second lens group includes a cemented lens formed from a positive lens element and a negative lens element, and a negative lens element, in that order from the object side. The following conditions (1) and (2) are satisfied:03-22-2012
20090002843ZOOM LENS - In the zoom lens, the second lens group includes at least one surface that is an aspheric surface, and during changing magnification, the second lens group, the third lens group, and the fourth lens group are respectively capable of moving independently, with the position of the aperture moving along a convex trajectory on the optical axis from the image side to the object side during changing magnification. Through operation in this manner, the zoom lens of the invention is inexpensive and compact, and efficiently corrects various types of aberration. Thus, at a high magnification ratio of 5× or greater, the zoom lens of the invention affords a wide field exceeding approximately 78 degrees at the wide angle end, and affords a high performance compact zoom lens whose distortion is held to 3% or less.01-01-2009
20090097131ZOOM LENS SYSTEM - A zoom lens system consists, in order from an object side to an image-forming side, of a first negative lens group G04-16-2009
20090219624PROJECTION ZOOM LENS SYSTEM AND PROJECTION TYPE DISPLAY APPARATUS - The projection zoom lens system includes a negative first lens group, a positive second lens group, a third lens group, a positive fourth lens group, a fifth lens group, and a positive sixth lens group. The lens system is nearly telecentric on a reduction side. During zooming, the second to fifth lens groups are moved while the first and six lens groups remain stationary. The third lens group includes a positive lens L09-03-2009
20120105974Zoom Lens - Provided is a compact zoom lens with a high resolving power, a large aperture, and a high variable power. The zoom lens includes a positive first lens group, a moving negative second lens group, a stationary positive third lens group, and a moving positive fourth lens group. The first lens group includes a negative eleventh lens, a positive twelfth lens, and a positive thirteenth lens. The second lens group is composed of a negative twenty-first lens, a negative twenty-second lens, a positive twenty-third lens, and a negative twenty-fourth lens. The third lens group includes a positive thirty-first lens, a positive thirty-second lens, and a negative thirty-third lens. The fourth lens group is composed of a positive forty-first lens having one or more aspheric surfaces. The zoom lens satisfies the prescribed conditional expressions.05-03-2012
20090251794ZOOM LENS SYSTEM, INTERCHANGEABLE LENS APPARATUS AND CAMERA SYSTEM - A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention, in order from an object side to an image side, comprises: a first lens unit having positive optical power; a second lens unit having negative optical power; and at least three subsequent lens units, wherein the at least three subsequent lens units, in order from an object side to an image side, include: a lens unit A having positive optical power; a lens unit B having positive optical power and arranged on the image side relative to the lens unit A; and a lens unit C having negative optical power and arranged on the image side relative to the lens unit A, the lens unit C being located on the most image side, at the time of zooming, all lens units move in a direction along the optical axis so that intervals between the lens units vary, and at the time of focusing, the lens unit B moves in a direction along the optical axis.10-08-2009
20090251793ZOOM LENS SYSTEM AND IMAGING OPTICAL DEVICE EMPLOYING THE SAME - The present zoom lens system comprises a plurality of lens units including at least: a front lens unit having negative optical power; and a rear lens unit having positive optical power, arranged on the image side of the front lens unit, and composed of a plurality of lens elements; wherein magnification change is performed by changing an interval between the individual lens units, wherein the rear lens unit comprises: a rear A lens unit capable of moving in a direction perpendicular to an optical axis; and a rear B lens unit that is arranged on the image side of the rear A lens unit and that can move in an optical axis direction in such a manner that an interval relative to the rear A lens unit in the optical axis direction is changed, and wherein focusing adjustment during variation of the object distance is achieved by changing the interval between the rear A lens unit and the rear B lens unit.10-08-2009
20090257131Zoom lens and image pickup apparatus equipped with same - An apparatus has a zoom lens and an image pickup element disposed on the image side of the zoom lens that converts an optical image formed by the zoom lens into an electrical signal. The zoom lens includes, in order from the object side to the image side, a negative first lens unit, a negative second lens unit, a positive third lens unit, and a negative fourth lens unit. During zooming from the wide angle end to the telephoto end, the distance between the first lens unit and the second lens unit changes, the distance between the second lens unit and the third lens unit changes, and the distance between the third lens unit and the fourth lens unit changes, the distance between the second lens unit and the third lens unit being smaller at the telephoto end than at the wide angle end. The first lens unit includes a reflecting surface that deflects the optical path, and the zoom lens satisfies the following condition (1): −10010-15-2009
20090122418ZOOM LENS UNIT AND IMAGING APPARATUS - A zoom lens unit includes, in order from an object side to an image side: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; a fourth lens group having a negative refracting power; a fifth lens group having a positive refracting power; and a sixth lens group having a negative refracting power, an aperture stop is disposed between the second lens group and the third lens group, and when changing magnification from a wide-angle end to a telephoto end, at least the second lens group, the third lens group and the fifth lens group are moved, and the first lens group includes a reflecting optical element which bends a light path in the first lens group to obtain a predetermined light path length.05-14-2009
20100149654ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes first to fourth lens units in order from the object side to the image side. The first, third, and fourth lens units have a positive refractive power. The second lens unit has a negative refractive power. Distances between the lens units are changed during zooming. The first lens unit is composed of a cemented lens including a first lens having a negative refractive power and a second lens having a positive refractive power arranged in order from the object side to the image side. The Nd1a and νd1a are a refractive index and an Abbe number, respectively, of a material of the first lens for the d-line and are adequately set.06-17-2010
20100182704Zoom Lens and Image Pickup Apparatus - A zoom lens includes: a first lens group with a positive refractive power, including a reflection optical element; a second lens group with a negative refractive power; a third lens group with a positive refractive power; a fourth lens group with a positive refractive power; and a fifth lens group with a negative refractive power. A power of the zoom lens varies by moving the second lens group, the fourth lens group, and the fifth lens group along an optical axis. A negative lens in the first lens group or a positive lens in the second lens group satisfies the predetermined conditions relating to a refractive index and an Abbe number.07-22-2010
20100182705ZOOM LENS SYSTEM AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens system including, in order from object-side to image-side: a positive first lens unit, a second negative lens unit, a third lens unit and a fourth positive lens units, in which: the fourth unit includes a front subunit having positive power and a rear subunit having positive power; the following conditions are satisfied:07-22-2010
20100238562ZOOM LENS SYSTEM AND OPTICAL APPARATUS USING THE SAME - Providing a zoom lens system being compact and simple having excellent optical performance suitable for an optical apparatus with a limited space for a zoom lens, and capable of shifting an image, and an optical apparatus equipped therewith. The system includes, in order from an object: a first group having positive power and an optical path bending element; a second group having negative power; a third group having positive power; and a fourth group having positive power. Upon zooming from a wide-angle end to a telephoto end, the first and third groups are fixed relative to an image plane, the second group and the fourth group are moved along the optical axis, an image on the image plane can be shifted by shifting the third group or a portion thereof substantially perpendicularly to the optical axis. The first group includes at least one negative lens, and satisfies a given condition.09-23-2010
20110058260ZOOM LENS SYSTEM AND IMAGING APPARATUS INCLUDING THE SAME - A zoom lens system includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power, wherein the first through third lens groups are arranged sequentially from an object side. When the zoom lens system is zoomed from a wide angle position to a telephoto position, an interval between the first lens group and the second lens group decreases and an interval between the second lens group and the third lens group increases. The first lens group comprises three lenses. An imaging apparatus includes the zoom lens system.03-10-2011
20090040621ZOOM LENS - A zoom lens for capturing images that enhances the image aberration correction rate to achieve high resolution and zooming ratio. The zoom lens includes, in sequence from an object side to an image side, a first lens group with positive refraction power, a second lens group with negative refraction power, a third lens group with positive refraction power, a fourth lens group with positive refraction power, a fifth lens group with positive refraction power and a sixth lens group with positive refraction power. The positions of first and sixth lens groups are fixed during photographing. When the zoom lens is made to zoom from a wide-angle end to a telephoto end thereof, the second lens group moves toward the image side while the fourth and fifth lens groups move toward the object side. In addition, the zoom lens has a reflection element so as to fold the image light entering thereof.02-12-2009
20110109978Zoom lens and image pickup apparatus equipped with same - A zoom lens according to the present invention includes, in order from the object side to the image side, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a negative refracting power, and a fourth lens unit having a positive refracting power, wherein during zooming from the wide angle end to the telephoto end, the first lens unit, the second lens unit, the third lens unit, and the fourth lens unit move in such a way that they are located closer the object side at the telephoto end than at the wide angle end, the distance between the first lens unit and the second lens unit is larger at the telephoto end than at the wide angle end, the distance between the second lens unit and the third lens unit is larger at the telephoto end than at the wide angle end, and the distance between the third lens unit and the fourth lens unit is smaller at the telephoto end than at the wide angle end. The zoom lens satisfies a predetermined condition.05-12-2011
20090034089ZOOM LENS - The zoom lens 02-05-2009
20110116172OPTICAL SYSTEM, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING OPTICAL SYSTEM - An optical system includes, in order from an object side: a first lens group G05-19-2011
20090097132Three-unit zoom lens and image pickup apparatus equipped with same - A three-unit zoom lens includes, in order from the object side, a negative first lens unit G04-16-2009
20090244719ZOOM LENS SYSTEM AND ELECTRONIC IMAGING APPARATUS THAT USES THE SAME - A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group.10-01-2009
20090251795ZOOM LENS SYSTEM, INTERCHANGEABLE LENS APPARATUS AND CAMERA SYSTEM - A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention, in order from an object side to an image side, comprises: a first lens unit having positive optical power; a second lens unit having negative optical power; and at least two subsequent lens units, wherein the at least two subsequent lens units include a lens unit A and a lens unit B arranged on the image side relative to the lens unit A, at the time of zooming, all lens units move in a direction along the optical axis so that intervals between the lens units vary, at the time of focusing, the lens unit A moves in a direction along the optical axis, and the following condition is satisfied.10-08-2009
20090034090ZOOM LENS SYSTEM - A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in this order from the object.02-05-2009
20110069396ZOOM LENS - The invention relates to a new mechanism for permitting a zoom lens to focus on a short distance subject by moving a focusing lens group in an amount that varies in an optical axis direction depending on a zooming position. The zoom lens comprises, in order from its object side, a positive first lens group, a negative second lens group and a positive third lens group. Zooming is implemented while the space between adjoining lens groups is varied, and focusing on a short distance subject is implemented by moving the negative second lens group in an amount that varies in the optical axis direction depending on a zooming position. The negative second lens group comprises a negative front unit G03-24-2011
20080285145COMPACT ZOOM LENS OPTICAL SYSTEM AND DRIVING METHOD OF THE SAME - A refractive-type zoom lens optical system includes a first lens group having a negative lens power and including a reflection member, a second lens group having a negative lens power, a third lens group having a positive lens power, a fourth lens group having a negative lens power, and a stop between the second lens group and the third lens group, wherein an overall length of the system is fixed during zooming and focusing.11-20-2008
20110157719ZOOM LENS AND PHOTOGRAPHING APPARATUS HAVING THE SAME - A zoom lens includes, sequentially from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group. During zooming from a wide angle position to a telephoto position, the interval between the first lens group and the second lens group increases, the interval between the second lens group and the third lens group decreases, and an interval between the third lens group and the fourth lens group varies. The fourth lens group includes, sequentially from the object side, a first sub-lens group having a positive refractive power, a second sub-lens group having a negative refractive power, and a third sub-lens group. The second sub-lens group of the fourth lens group is moved along an optical axis to perform focusing.06-30-2011
20100321791VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL APPARATUS WITH THE SAME, AND METHOD FOR MANUFACTURING VARIABLE MAGNIFICATION OPTICAL SYSTEM - Provided are a variable magnification optical system for making it possible to properly set a variable magnification ratio of each lens group by properly setting a variable magnification ratio of a fifth lens group, and an optical apparatus with the variable magnification optical system, and a method for manufacturing the variable magnification optical system. The optical apparatus has first to sixth lens groups (G12-23-2010
20110019288ZOOM LENS - An inner-focusing zoom lens that includes multi groups of lens pieces, namely, the first lens group or the leading lens group of positive refractivity, the second lens group of negative refractivity, and the remaining trailing groups of positive refractivity, as a whole. At least one group of positive refractivity among the trailing groups includes two or more negative lens pieces, at least one of which is connected on its surface to another lens piece to form a duplicated composite lens so that the junction between two of them functions to diverge incident beams. Assuming now that a sum of the refractivities of all the junctions of the composite lenses can be expressed as Σφ=Σ|(N1−N2)/R| where N1 and N2 are refractivities that substances before and after the junction of the composite lenses respectively have, R is a radius of curvature of the junction, ft is a focal length of the comprehensive lens optics of the zoom lens at the telephoto end.01-27-2011
20080278824Image pickup apparatus having optical path reflecting zoom lens system - An image pickup apparatus having an optical path reflecting zoom lens system includes a zoom lens system, and an image pickup element which is disposed at an image side of the zoom lens system. The zoom lens system includes in order from an object side thereof a first lens unit G11-13-2008
20120206818ZOOM LENS SYSTEM - A zoom lens system including, in an order from an object to an image: a first lens group including at least one lens, and a refraction member for bending an optical axis, and having positive refractive power; a second lens group having negative refractive power; a third lens group; and a fourth lens group, wherein zooming is performed by changing at least one interval between the first through fourth lens groups.08-16-2012
20100020411PROJECTION VARIABLE FOCUSING LENS AND PROJECTION DISPLAY DEVICE - Disclosed is a projection variable focusing lens and a projection display device that has a reduction side which is telecentric, a high magnifying power, a small size, a light weight, and a low manufacturing cost and is capable of correcting all aberrations occurring when power varies with good balance.01-28-2010
20100020410Zoom lens, lens barrel and image pickup apparatus - Disclosed herein is a zoom lens, wherein a stop moves in an optical axis direction n in a phase of zooming; a position of the stop in a telephoto end is located on an object side with respect to a position of the stop in a wide-angle end; an opening size of the stop is controlled in conjunction with the zooming so that an open F number becomes approximately constant in a range from the wide-angle end to a specific intermediate focal length; the opening size of the stop is made approximately constant in a range from the specific intermediate focal length to the telephoto end so that the open F number is changed; and the specific intermediate focal length fulfills the following conditional expression (1), wide-angle end focal length×1.501-28-2010
20120307375ZOOM LENS, IMAGING DEVICE AND INFORMATION DEVICE - A zoom lens includes, in order from an object side in an optical axis a first lens group having a positive refractive power, a second lens group having a negative refractive power; a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, a fifth lens group having a positive refractive power, and an aperture stop arranged between the third lens group and the fourth lens group, an interval between the first lens group and the second lens group being increased, an interval between the second lens group and the third lens group being varied, an interval between the third lens group and the fourth lens group being decreased, and an interval between the fourth lens group and the fifth lens group being decreased when changing a magnification from a wide-angle end to a telephoto end.12-06-2012
20120307374ZOOM LENS SYSTEM AND OPTICAL INSTRUMENT USING THE SAME - A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side. The second lens group constitutes a focusing lens group. The following conditions (1) and (2) are satisfied:12-06-2012
20120307373ZOOM LENS AND IMAGE PICKUP APPARATUS EQUIPPED WITH ZOOM LENS - A zoom lens includes, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. All of the lens units are moved during zooming from a wide-angle end to a telephoto end. An aperture stop is arranged on the image side of the third lens unit. A distance T23 from a lens surface closest to the image side in the second lens unit to a lens surface closest to the object side in the third lens unit when the zoom lens is at the telephoto end, a focal length fT of the entire zoom lens at the telephoto end, and focal lengths f1, f2, and f3 of the first, second, and third lens units, respectively, are set based on predetermined mathematical conditions.12-06-2012
20120013993ZOOM LENS SYSTEM, INTERCHANGEABLE LENS APPARATUS AND CAMERA SYSTEM - A zoom lens system comprising: a first lens unit having positive optical power; a second lens unit having positive optical power; and at least one subsequent lens unit, wherein the zoom lens system has an image blur compensating lens unit which moves in a direction perpendicular to an optical axis, at least the first lens unit moves along the optical axis at the time of zooming from a wide-angle limit to a telephoto limit, the second lens unit or a third lens unit which is located closest to the object side in the at least one subsequent lens unit moves along the optical axis at the time of focusing from an infinity in-focus condition to a close-object in-focus condition, and the condition: 0.10<|m|/(f01-19-2012
20120013992ZOOM LENS AND IMAGE PICKUP APPARATUS - A zoom lens comprising, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The second and third lens units are configured to move in an optical axis direction for a magnification variation, and the first lens unit is configured to move in the optical axis direction to reduce an image-plane fluctuation associated with the magnification variation. Expressions −0.83≦f01-19-2012
20110085249ZOOM LENS SYSTEM AND IMAGE PICKUP APPARATUS - A zoom lens system and an image pickup apparatus including the same are provided. The zoom lens system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power, which are arranged in an order from an object side. When zooming is performed from a wide angle position to a telephoto position, the first lens group, the third lens group and the fifth lens group remain fixed and the second lens group and the fourth lens group move.04-14-2011
20120026602ZOOM LENS SYSTEM, INTERCHANGEABLE LENS APPARATUS AND CAMERA SYSTEM - A zoom lens system, in order from an object side to an image side, comprising a front unit and a rear unit, wherein the rear unit, in order from the object side to the image side, comprises: a subsequent first lens unit and a subsequent second lens unit having negative optical power and being a focusing lens unit which moves along an optical axis at the time of focusing from an infinity in-focus condition to a close-object in-focus condition, the subsequent first lens unit comprises a first-N sub lens unit having negative optical power and a first-P sub lens unit having positive optical power, and the first-N sub lens unit or the first-P sub lens unit is an image blur compensating lens unit which moves in a direction perpendicular to the optical axis in order to optically compensate image blur; an interchangeable lens apparatus; and a camera system are provided.02-02-2012
20090135498ZOOM LENS, OPTICAL APPARATUS EQUIPPED WITH THE ZOOM LENS AND METHOD FOR FORMING AN IMAGE OF AN OBJECT AND VARYING A FOCAL LENGTH - A zoom lens comprises the following lens groups in the order from an object side: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; and a fourth lens group having a positive refracting power; wherein, upon zooming, at least the first lens group and the fourth lens group move to the object side; and wherein, upon focusing, the fourth lens group comprises a front lens group, and a rear lens group arranged with an air space on an image side of the front lens group, and the rear lens group is moved in a direction of an optical axis of the zoom lens.05-28-2009
20110102906LENS SYSTEM - A lens system includes, in order from an object side, a first lens group with positive refractive power, a second lens group with negative refractive power that moves during zooming, a third lens group with positive refractive power, and a fourth lens group with positive refractive power that moves during zooming and focusing adjustments. The first lens group includes a lens with positive refractive power and an Abbe number vd05-05-2011
20100091382ZOOM LENS, OPTICAL APPARATUS HAVING THE SAME, AND MANUFACTURING METHOD - A zoom lens having an optical element for deflecting an optical path includes, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having positive refractive power; and a fifth lens group having negative refractive power. The third lens group has a plurality of lenses, and the following conditional expressions 1.0004-15-2010
20120212833ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes: a first lens group having negative refractive power; a diaphragm; a second lens group having positive refractive power; a third lens group having negative refractive power; and a fourth lens group having positive refractive power, arranged in order from an object side. The first lens group is configured by at least one negative lens and one positive lens. The third lens group is configured by one negative lens. Then power is changed from a wide angle end state to a telephoto end state, the first, second, and third lens groups are moved in the direction of an optical axis, and the fourth lens group is fixed. When focusing, the third lens group is moved in the direction of the optical axis so as to satisfy the following Conditional Equations,08-23-2012
20120162779Zoom Lens System, Interchangeable Lens Apparatus and Camera System - A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, wherein the first lens unit moves along an optical axis, and the fourth lens unit is fixed relative to an image surface, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, and the condition: 0.8<|f06-28-2012
20120162778Zoom Lens System, Interchangeable Lens Apparatus and Camera System - A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, wherein the third lens unit moves along an optical axis in focusing from an infinity in-focus condition to a close-object in-focus condition, and the conditions: 0.5<|f06-28-2012
20120162777Zoom Lens System, Interchangeable Lens Apparatus and Camera System - A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, wherein the first lens unit is composed of at least three lens elements, has at least one lens element having positive optical power, and moves along an optical axis in zooming, and the conditions: n06-28-2012
20120212834ZOOM LENS SYSTEM - A zoom lens system has a combined focal length fw at the wide angle end and includes, in order from an object side, a first lens group with positive refractive power and combined focal length f08-23-2012
20120075717VARIABLE POWER OPTICAL SYSTEM AND IMAGING APPARATUS - A variable power optical system, including a fixed negative first lens group, a second positive lens group and a third positive lens group, wherein the first lens group includes a deflecting element arranged to bend an optical path, and when d03-29-2012
20120075716Zoom lens and electronic amaging apparatus incorporating the same - The zoom lens of the invention comprises, in order from an object side thereof, a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, a fourth lens group having positive refracting power, a fifth lens group having negative refracting power, and a sixth lens group having positive refracting power. The first lens group includes a reflective optical element, and the lens component in, and on the most image side of, the fourth lens group has negative refracting power.03-29-2012
20120176686ZOOMS LENS SYSTEM AND PHOTOGRAPHING APPARATUS INCLUDING THE SAME - A zoom lens system and a photographing apparatus including the same, wherein the zoom lens system includes a first lens group including one or more lenses, and an optical member for changing a path of light, and having a positive refractive power; a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, wherein zooming is performed by varying air gaps between the first through fourth lens groups.07-12-2012
20100007967ZOOM LENS UNIT, IMAGING APPARATUS AND PORTABLE INFORMATION TERMINAL DEVICE - A zoom lens unit including, in order from an object side to an image surface side: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; and a fourth lens group having a positive refracting power, wherein when changing magnification from a wide-angle end to a telephoto end, an interval between the first lens group and the second lens group increases, an interval between the second lens group and the third lens group decreases, and an interval between the third lens group and the fourth lens group increases, wherein when performing focusing on a close range object at least at the telephoto end, with reference to a focused state on an infinite object, the first lens group and the second lens group are fixed, the third lens group is capable of being moved to the image surface side, and the fourth lens group is capable of being moved to the object side.01-14-2010
20120081796Zoom lens and imaging apparatus - In a zoom lens, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having the positive refractive power are disposed from an object side to an image side; and in a phase of variable magnification from a wide-angle end to a telescopic end, the first lens group is moved and the second lens group is moved to the object side such that an air interval between the first lens group and the second lens group is decreased and an air interval between the second lens group and the third lens group is increased.04-05-2012
20120262799ZOOM LENS - An embodiment of this invention provides a zoom lens, which includes, in order from an object side to an image-forming side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power, wherein the second lens group, the fourth lens group, and the fifth lens group are moving with respect to one another, for zooming from a wide-angle end to a telephoto end thereof.10-18-2012
20120327518ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes, in order from the object side to the image side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; a third lens group that has a positive refractive power; and a fourth lens group that has a positive refractive power12-27-2012
20110216423HIGH ZOOM-RATIO ZOOM LENS SYSTEM - A high zoom-ratio zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group, in that order from the object side, wherein upon zooming from the short to the long focal length extremities, the first through fourth lens groups are moved along the optical axis direction, wherein an amount of movement of the first lens group is greater than that of the third lens group. The following conditions (1) and (2) are satisfied:09-08-2011
20120140337Zoom lens and image capturing apparatus - An inner focus type zoom lens includes a first lens group that has positive refracting power and is normally located at a fixed position, a second lens group that has negative refracting power and is movable in an optical axis direction for zooming, a third lens group that has positive refracting power, a fourth lens group that is movable for correction of a focal position due to the zooming and for focusing, and a fifth lens group that has positive refracting power, in order from an object side, wherein the first lens group includes a negative lens, a first positive lens, and a second positive lens arranged in order from the object side, wherein a first face of the negative lens has a shape of a concave surface turned on the object side, and wherein the zoom lens satisfies the following conditional equation (1) −10.006-07-2012
20110157720ZOOM LENS AND PHOTOGRAPHING APPARATUS INCLUDING THE SAME - A small-sized zoom lens having a high zooming rate and a high optical performance, the zoom lens including a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, wherein an iris diaphragm is disposed between the second lens group and the third lens group.06-30-2011
20080247054ZOOM LENS - A zoom lens is provided and has a first group having a positive refractive power, a second group having a negative refractive power, an aperture stop, a third group having a positive refractive power and a fourth group having a positive refractive power, which groups are arranged in this order from the object side. The first group has a three-group four-lens configuration where a cemented lens of a negative lens and a positive lens, and two positive single-lenses and are disposed in this order from the object side. The second group has a three-group four-lens configuration where two single-lenses and each having a negative refractive power with a strong concave surface on the image side, and a cemented lens of a double-concave lens and a positive lens are disposed in this order from the object side.10-09-2008
20130141797ZOOM LENS AND IMAGING APPARATUS - A zoom lens is provided, and includes, in sequence from an object side: a first lens group with positive refractive power; a second lens group with negative refractive power; a third lens group with positive refractive power; a fourth lens group with positive refractive power; and a fifth lens group with negative refractive power. At the time of a magnification change from a wide-angle end to a telescopic end, the first lens group, the third lens group, and the fifth lens group are fixed in a direction of an optical axis, the second lens group moves along the optical axis from the object side to an image side for the magnification change, the fourth lens group moves along the optical axis to compensate for a change of a position of the image surface according to the movement of the second lens group, and performs focusing. The first lens group includes at least one negative lens and at least three positive lenses, and a cemented lens in which a biconcave negative lens and a positive lens are cemented is disposed on a most object side of the first lens group.06-06-2013
20080218875Zoom Lens System and Imaging Device - There is provided a zoom lens system including at least a first lens group GR09-11-2008
20130120853ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - Provided is a zoom lens comprising, in order from an object side to an image side, a first lens unit having positive refracting power; a second lens unit having negative refracting power; a third lens unit having positive refracting power; a fourth lens unit having negative refracting power; and a fifth lens unit having positive refracting power, wherein the lens units move when zooming from the wide-angle end to the telephoto end; the third lens unit and the fifth lens unit move together when zooming; the fifth lens unit includes an aperture stop in the optical path thereof; the third lens unit or the fourth lens unit moves during focusing; and the following conditional expression is satisfied: 0.5<|f05-16-2013
20110211264ZOOM LENS SYSTEM - A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group. The second lens group includes a positive lens element, and two negative lens elements. The following conditions (1) and (2) are satisfied:09-01-2011
20080198474Optical path bending type zoom lens system and image taking apparatus including the same - A zoom lens system comprises, in order from an object side, a positive first lens unit including a reflective optical element, a negative second lens unit, a positive third lens unit and a positive fourth lens unit, or a positive first lens unit, a negative second lens unit, a positive third lens unit, a negative fourth lens unit and a positive fifth lens unit. During zooming from a wide-angle end toward a telephoto end, the first lens unit is fixed, at least the second and third lens units move, and a space between the lens units changes. The second lens unit is positioned closer to an image-surface side in the telephoto end than in the wide-angle end, and the third lens unit is positioned closer to the object side in the telephoto end than in the wide-angle end. An image taking apparatus including the zoom lens system is also disclosed.08-21-2008
20110299177ZOOM LENS - A zoom lens comprising sequentially from an object side a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a negative refractive power; and a fifth lens group having a positive refractive power and formed by a cemented lens alone that includes a negative lens and a positive lens. The zoom lens zooms from a wide angle edge to a telephoto edge by moving the second lens group along an optical axis, from the object side toward the image plane side. The zoom lens performs focusing and corrects image plane variation accompanying zoom by moving the fourth lens group along the optical axis, and corrects image blur caused by minute vibrations by moving the entire fifth lens group in a direction orthogonal to the optical axis.12-08-2011
20120019931Zoom lens, and imaging apparatus incorporating the same - The invention provides a zoom lens, characterized by comprising, in order from an object side thereof, 01-26-2012
20120019930HIGH-SPEED ZOOM LENS - Embodiments of an optical zoom lens system may comprise three lens groups with a PNP power sequence. The first lens group may vary focus. The second and third lens groups may be movable to vary magnification during zoom. The first lens group may include three lens subgroups with an NNP power sequence: a stationary first lens subgroup, a second lens subgroup including a movable lens element, and a stationary or movable third lens subgroup. The second lens subgroup may include two parts, which may be movable at different rates of travel to vary focus. One part may include the movable lens element. Lens elements of the first lens group may be movable according to different focus movement plans. In the first lens group, lens element movement and lens element power may contribute to provide low focus breathing over the entire zoom range. The F-number may be F/2.8 or less.01-26-2012
20130201565Inner Focusing Telephotographing Zoom Lens - The present invention is directed to providing a large aperture telephotographing zoom lens that employs an inner-focusing system to enable quick focusing and avoid a great aberration when the zoom lens renders the close object in focus. The zoom lens comprises at least five groups of lens pieces arranged in series, namely, the foremost or first lens group of positive refractivity positioned the closest to the object, the succeeding second lens group of negative refractivity, the third lens group of negative refractivity, the fourth lens group of positive refractivity, and the rearmost or fifth lens group of positive refractivity. During varying the magnification for zooming in a transition from the wide-angle end to the telephoto end, all the lens pieces of the second, third, and fourth lens groups are moved toward the image plane, and the third lens group alone is displaced for focusing.08-08-2013
20120087016ZOOM LENS AND IMAGE PICKUP APPARATUS WITH ZOOM LENS - A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. In the zoom lens, during zooming, each lens unit is configured to move such that distances among the lens units vary. The first lens unit consists of three lenses. A relative partial dispersion θgF and an Abbe number νd of a material of the positive lens included in the first lens unit are appropriately set by satisfying predetermined mathematical conditions.04-12-2012
20120092777ZOOM LENS AND IMAGING APPARATUS INCORPORATING THE SAME - A zoom lens comprising, in order from an object side thereof, a first lens group of positive refracting power, a second lens group of negative refracting power, an aperture stop, a third lens group of positive refracting power, a fourth lens group of negative refracting power, and a fifth lens group of positive refracting power. Upon zooming from the wide-angle end to the telephoto end, at least the first lens group and the aperture stop remain fixed in position, the second and third lens groups move in the optical axis direction, and the separation between each of the lens groups and the aperture stop changes. Upon focusing from a focusing-on-infinity state to a close-range-focusing state, the fourth lens group moves in the optical axis direction, with satisfaction of the following:04-19-2012

Patent applications in class Other than first group moves for focusing (internal focus type)