Variable-magnification optical system and image-taking...

Details Variable-magnification optical system and image-taking... Variable-magnification optical system and image-taking...

2005-09-29

2008-10-07

LeDynh, Bot (Department: 2862)

Photography

Having variable focal length of camera objective

C348S240300, C359S678000, C359S683000, C359S689000

Reexamination Certificate

active

07433584

ABSTRACT:
A variable-magnification optical system has, from the object side to the image side, at least a first lens group having a positive optical power, a second lens group having a negative optical power, and a third lens group having a positive optical power. The first lens group includes an optical prism that changes the optical path, and a prescribed conditional formula is fulfilled.

REFERENCES:
patent: 6771432 (2004-08-01), Mihara
patent: 7075732 (2006-07-01), Watanabe et al.
patent: 2006/0274426 (2006-12-01), Sueyoshi
patent: 8-248318 (1996-09-01), None
patent: 9-146000 (1997-06-01), None

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