Zoom lens unit, imaging device and photographing device

Details Zoom lens unit, imaging device and photographing device Zoom lens unit, imaging device and photographing device

2007-12-04

2007-12-04

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000, C359S685000, C359S687000, C359S689000, C359S690000, C359S715000, C359S716000, C359S740000

Reexamination Certificate

active

11582329

ABSTRACT:
A zoom lens unit includes: a positive first lens group; a negative second lens group; and a positive subsequent lens group as a whole, the subsequent lens group includes a third lens group, and an aperture stop is disposed between the second lens group and the third lens group, and a lens construction including the first and the second lens groups satisfies the condition (1): 1.0<ri/ri+1<5.0, in which riand ri+1are curvature radii of lens surfaces Siand Si+1in the lens construction, respectively, the lens surfaces Siand Si+1being “i”th and “i+1”th lens surfaces, respectively, counted from the object side, and a reflectivity-reducing treatment adapted to reduce intensity of a ghost image is performed on each lens surface forming at least one of pairs of lens surfaces satisfying the condition (1).

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