Patent application number | Description | Published |
20080212184 | Zoom Lens and Imaging Apparatus - Provided are a zoom lens and an imaging apparatus using the zoom lens, the zoom lens being suited for achieving compactness without increasing the number of lenses and being capable of implementing motion blur compensation. The zoom lens includes lenses arranged in order from an object side into 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 positive refractive power. In the event of a shift of a lens position mode from a wide angle end mode to a telephoto end mode, the first lens group is fixed along an optical axis direction, the second lens group moves to an image side, the third lens group is fixed along the optical axis direction, the fourth lens group compensates for a fluctuation in an image plane position due to the shift of the second lens group, and concurrently moves along the optical axis direction in a close-distance focusing event, and the fifth lens group is fixed along the optical axis direction. An aperture diaphragm is disposed in the vicinity of the third lens group. The fifth lens group includes a negative sub lens group having negative refractive power and a positive sub lens group having a positive refractive power, wherein the image can be shifted in conjunction with a shift of the positive sub lens group in a direction substantially perpendicular to the optical axis. The zoom lens satisfies conditional equation (1) given as 0.609-04-2008 | |
20090009884 | Zoom Lens and image pickup apparatus - A zoom lens includes first to third lens groups having negative, positive, and positive refractive powers, respectively. When a lens position state changes from a wide-angle to a telephoto, all lens groups are moved in an optical axis direction so that a distance between the first and second lens groups decreases and a distance between the second and third lens groups increases. A close-distance focusing is accomplished by moving the third lens group. The first lens group is composed of negative and positive lens components. The second lens group is composed of a positive lens component, and a cemented lens composed of a positive lens of biconvex shape, and a negative lens of biconcave shape. The third lens group is composed of a positive lens component in which at least one of object-side and image-side lens surfaces is aspheric. The zoom lens is satisfied a predetermined condition. | 01-08-2009 |
20090046374 | Zoom 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 |
20090109545 | Zoom Lens and Image-Pickup Apparatus - To provide a zoom lens capable of achieving stable optical quality by inhibiting an effect of assemble errors during manufacturing. A zoom lens includes a positive first lens group G | 04-30-2009 |
20090135485 | Zoom lens and image capturing apparatus - The object of the present invention is to provide a zoom lens in which a lens group located in the vicinity of an aperture stop includes two subgroups and one of the subgroups is shifted so that an image is shifted. Thus, an increase in the size of lens groups including a shift lens group can be prevented. In addition, the sensitivity with respect to the axis tilt can be reduced while maintaining a sufficient distance between the two subgroups without increasing the size of the lens groups. Accordingly, a sufficient performance can be provided. | 05-28-2009 |
20100033836 | Variable focal length lens system - A variable focal length lens system includes: 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 negative refracting power; and a sixth lens group having a positive refracting power; the first to sixth lens groups being disposed in order from an object side. | 02-11-2010 |
20100195217 | Variable focal length lens system and imaging apparatus - A variable focal length lens system includes first to fourth lens groups which have positive, negative, positive, and positive refractive powers, respectively, and are arranged in this order from an object side to an image side. An aperture diaphragm is arranged in the vicinity of the third lens group. The variable focal length lens system satisfies the following Conditional expressions 1 and 2: | 08-05-2010 |
20100220398 | Variable-focal-length lens system and imaging apparatus - A variable-focal-length lens system includes first to fifth lens groups having positive, negative, positive, negative, and positive refractive powers, respectively, from the object side. As the lens-position state changes from wide-angle to telephoto, the air space between the first and second lens groups increases, the air space between the second and third lens groups decreases, the air space between the third and fourth lens groups changes, the air space between the fourth and fifth lens groups increases, the first lens group moves monotonously toward the object, the second lens group is fixed in the optical-axis direction, and the third and fourth lens groups move toward the object. Conditions 0.209-02-2010 | |
20100220399 | Variable focal distance lens system and imaging device - A variable focal distance lens system includes a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power, which are sequentially disposed from an object side to an image side. The system satisfies −0.65<(R | 09-02-2010 |
20100232020 | Zoom lens and imaging apparatus - A lens includes a front group including a plurality of lens groups; and a rear group that is provided on an image side of the front group and that includes a negative lens and a positive lens. The positive lens has a flat lens surface on its image side, and is tiltable about a spherical center of its object side lens surface that is convex on the object side. When a lens system is inclined, the positive lens is tilted in relation to the optical axis of the lens system based on: a focal length of the overall lens system; an angle of the optical axis of the lens system after being inclined in relation to the optical axis before being inclined; a distance between the image side lens surface of the positive lens and the image plane; and a refractive index of the positive lens. | 09-16-2010 |
20110085248 | Variable focal length lens system and image pickup device - Disclosed herein is a variable focal length lens system including a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The first to the fifth lens groups are arranged in order from an object side. The variable focal length lens system satisfies following conditional expressions (1) to (3): | 04-14-2011 |
20110157721 | LENS BARREL AND IMAGING APPARATUS - A lens barrel includes: a variable focal length lens system including at least three movable lens groups; and guiding means for moving the variable focal length lens system forward and backward in an optical axis direction. The variable focal length lens system includes at least first, second and third lens groups having positive, negative and positive refracting power, respectively, arranged in this order from an object side. When a lens position setting is changed from a wide angle end state to a telescopic end state, at least the first and third lens groups are moved toward the object side such that air separation between the first and second lens groups monotonously increases and air separation between the second and third lens groups monotonously decreases. The guiding means includes a fixed frame, a rotating frame, a rectilinear guiding frame, a first guide frame, and a second guide frame. | 06-30-2011 |
20130057751 | VARIABLE FOCAL LENGTH LENS SYSTEM AND IMAGING APPARATUS - A variable focal length lens system including: a first lens group having positive power; a second lens group having negative power; a third lens group having positive power; and a fourth lens group having positive power sequentially arranged from a side where an object is present. An aperture stop is disposed between the second and third lens groups. The first to fourth lens groups are so moved that the distance between the first and second lens groups increases, the distance between the second and third lens groups decreases, and the distance between the third and fourth lens groups decreases when a lens position setting is changed from a wide angle end state to a telescopic end state. The third lens group includes a negative lens and a positive lens disposed on the image side thereof. The variable focal length lens system satisfies the following conditional expression. | 03-07-2013 |