公开(公告)号：US07336304B2

公开(公告)日：2008-02-26

申请号：US10921939

申请日：2004-08-20

申请人： Hiroshi Endo ,  Michio Cho

发明人： Hiroshi Endo ,  Michio Cho

IPC分类号： H04N5/262 ,  H04N5/225 ,  G03B13/00 ,  G03B17/00 ,  G02N15/14

CPC分类号： G02B15/177

摘要： A zoom lens including front and rear elements, the front elements is set up so that the front elements are disposed at a position to satisfy the formula: T 1 ≥ Ha 1 + HH 1 + L + HH 2 + f 2 ⁡ ( f 1 - L ) f 1 + f 2 - L + f 1 2 m - f 1 , where a length from the top of the front elements on the optical axis to the front main point of the front elements: Ha1, a main point of the front elements: HH1, a length from the rear main point of the front elements to the front main point of the rear elements: L, a main point of the rear elements: HH2, a focal length of the front elements: f1, a focal length of the rear elements: f2, a length from the object at the time of photography to the front main point of the front elements: m, and a length from the top of the front elements on the optical axis to the imaging plane: T1.