Three-piece lens assembly

Details Three-piece lens assembly Three-piece lens assembly

2006-07-19

2008-10-28

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S791000, C359S792000

Reexamination Certificate

active

07443613

ABSTRACT:
A three-piece lens assembly comprises: a first lens group, a second lens group, a third lens group and an aperture. The first lens group is a positive meniscus lens with a convex surface facing the object side and with another surface facing an aperture. The second lens group is a positive meniscus lens with a concave surface facing the aperture and the object side. The third lens group is a biconcave lens with a concave surface facing the second lens and the object side and with another surface facing the image side, and the concave surface of the third lens facing the object side is greater than the another surface of the third lens facing the image side in radius of curvature. Both sides of the first, second and third lens groups are aspheric and are all made of plastic material.

REFERENCES:
patent: 6987625 (2006-01-01), Nakamura
patent: 7099092 (2006-08-01), Sato

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