Patent ID: 8605371
Filing Date: 2013-12-10
Classification: G02B

Abstract:
1. Miniature zoom lens, comprising: a) the zoom lens, as viewed from the object plane, includes at least the following in the stated sequence: b) the first optical lens group being a stationary lens group; c) the second, third, and fourth optical lens groups being 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; d) the second, third and fourth optical lens groups being configured in such a way that a change in focal length is achieved solely by displacement of the second and third optical lens groups and during the change of the focal length the position of the fourth optical lens group remains unchanged; e) the lens has a zoom factor which is >2.0; and f) a ratio of the partial overall length of the lens and of the image diagonals is ≦3.5.