Variable magnification optical system and imaging device

Details Variable magnification optical system and imaging device Variable magnification optical system and imaging device

2008-06-17

2008-06-17

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07388716

ABSTRACT:
A variable magnification optical system for forming an optical image of an object onto a light acceptance surface of an image sensor, has in order from an object side: a first lens group having negative optical power; a second lens group having positive optical power; and a third lens group having positive optical power, the third lens group including at least two lenses. In magnification change from a wide-angle limit to a telephoto limit, the first lens group moves along a locus convex to an image side, the second lens group moves monotonically to the object side, and the third lens group moves along a locus convex to the object side.

REFERENCES:
patent: 5111338 (1992-05-01), Nakayama
patent: 6943962 (2005-09-01), Sekita
patent: 6978088 (2005-12-01), Nomura
patent: 7046452 (2006-05-01), Ori

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