Patent application number | Description | Published |
20080304162 | ZOOM LENS AND IMAGE PROJECTION APPARATUS HAVING THE SAME - A zoom lens includes a first lens unit having a negative optical power located closest to an enlargement side. In the zoom lens, a focal length of the zoom lens at a wide-angle end (fw) and a focal length of the first lens unit (f1) satisfy the following condition: | 12-11-2008 |
20090201591 | ZOOM LENS SYSTEM AND CAMERA INCLUDING THE SAME - A zoom lens system includes a first lens unit having a positive optical power, a second lens unit having a negative optical power which moves during zooming, a third lens unit having a positive optical power which does not move for zooming, and a fourth lens unit having a positive optical power which moves during zooming. The first lens unit, the second lens unit, the third lens unit, and the fourth lens unit are arranged in order from the object side to the image side. A back focus of the zoom lens system and a focal length of the third lens unit are adequately set. | 08-13-2009 |
20100067119 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes, in order from object to image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power and movable during zooming, a third lens unit having a positive refractive power and including a positive lens element positioned nearest to an object-side end, and a fourth lens unit having a positive refractive power and movable during zooming. The second lens unit includes at least three negative lens elements arranged successively and independently along an optical axis and at least one positive lens element. The zoom lens satisfies specific numerical conditions defined for a focal length fw of the zoom lens at a wide-angle end, focal lengths f2 and f3 of the second and third lens units, and a focal length f31 of a positive lens element of the third lens unit nearest to the object-side end. | 03-18-2010 |
20110080648 | IMAGING APPARATUS - An imaging apparatus includes an imaging system, a dome cover that houses the imaging system, and a correction lens between the imaging system and the dome cover. The focal length of the dome cover and the focal length of the correction lens are appropriately set based on predetermined conditions. | 04-07-2011 |
20120013992 | ZOOM 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≦f | 01-19-2012 |
20120268625 | ZOOM LENS AND IMAGE PICKUP APPARATUS EQUIPPED WITH ZOOM LENS - A zoom lens includes 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 in order from an object side to an image side. The second and fourth lens units move during zooming, and the first and third lens units do not move for zooming. A focal length fw of the entire zoom lens at a wide-angle end, a focal length ft of the entire zoom lens at a telephoto end, a focal length f | 10-25-2012 |
20130278814 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes, in order from an object side toward 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. The second lens unit, the third lens unit, and the fourth lens unit are moved during zooming. A position of the third lens unit at a telephoto end is closer to the object side than a position of the third lens unit at a wide-angle end. The focal length of the zoom lens at the wide-angle end, the difference in the position of the second lens unit on an optical axis between that at the wide-angle end and that at the telephoto end, and the focal length of the second lens unit are set appropriately. | 10-24-2013 |
20130321682 | ZOOM LENS AND IMAGE PICKUP APPARATUS EQUIPPED WITH THE SAME - A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, a third lens unit having negative refractive power, and a fourth lens unit having positive refractive power, in which each lens unit moves during zooming from a wide-angle end to a telephoto end, and a focal length of the first lens unit, a focal length of the second lens unit, and a focal length of the entire zoom lens at the wide-angle end are appropriately set. | 12-05-2013 |
20140300781 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes first, second, and third lens units respectively having negative, positive, and negative refractive powers in this order from an object side to an image side. The lens units move during zooming such that the spacing between adjacent lens units changes, the second and third lens units are positioned on the object side at a telephoto end when compared to a wide angle end, and the third lens unit moves during focusing. A lateral magnification of the second lens unit at the wide angle end, a lateral magnification of the second lens unit at the telephoto end, a lateral magnification of the third lens unit at the wide angle end, a lateral magnification of the third lens unit at the telephoto end, a focal length of the first lens unit, and a focal length of the second lens unit are appropriately set. | 10-09-2014 |
20150054988 | ZOOM LENS AND IMAGE PICKUP DEVICE INCLUDING THE SAME - A zoom lens is provided which has a wide angle of view and is bright and in which the entire lens system is compact and which can achieve high optical characteristic over the entire zoom range. | 02-26-2015 |