Wide-angle lens system and image-taking device

Details Wide-angle lens system and image-taking device Wide-angle lens system and image-taking device

2008-05-20

2008-05-20

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S781000

Reexamination Certificate

active

11398947

ABSTRACT:
A wide-angle lens system has, from the object side thereof: a first lens element having a negative optical power and having a meniscus shape convex to the object side; a second lens element having a biconcave shape; a third lens element having a biconvex shape; and a fourth lens element having a negative optical power and having a meniscus shape convex to the image side. Alternatively, a wide-angle lens system has, from the object side thereof: a first lens element having a negative optical power; a second lens element having a negative optical power; a third lens element having a positive optical power; and a fourth lens element having a positive optical power.

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European Search Report dated Jul. 6, 2006, for counterpart European Application No. Ep 06 00 7532.

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