Lens system and image-taking apparatus having the same

Details Lens system and image-taking apparatus having the same Lens system and image-taking apparatus having the same

2007-01-09

2007-01-09

Epps, Georgia (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C359S691000

Reexamination Certificate

active

11366692

ABSTRACT:
A lens system disclosed in the present application comprises: in order from the front to the rear, a first lens element having a meniscus shape whose concave surface is directed rearward and having a negative optical power; an aperture stop; a second lens element whose both lens surfaces have a convex shape; a third lens element whose both lens surfaces have a concave, and a fourth lens element whose rear surface has a convex shape and having a positive optical power. Thus, a lens system which maintains telecentricity and high optical performance despite a simple and small-sized structure is disclosed.

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