Three-piece type optical lens

Details Three-piece type optical lens Three-piece type optical lens

2007-02-28

2008-12-02

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S708000

Reexamination Certificate

active

07460314

ABSTRACT:
A three piece type optical lens includes a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, an IR cut-off filter and an image sensor arranged along an optical axis in sequence from an object side. The first lens element and the second lens element are both meniscus aspherical lens while a convex surface of the first lens element is on the object side and a convex surface of the second lens is on the image side. The third lens element is an M-shaped aspherical lens whose object side and image side are both M-shaped and a central surface of the optical axis can be a convex surface or a concave surface. A pre-aperture is disposed or a center-aperture is arranged on the optical lens.

REFERENCES:
patent: 7199948 (2007-04-01), Sato
patent: 2006/0061882 (2006-03-01), Sun
patent: 2007/0070526 (2007-03-01), Sato
patent: 2007/0091468 (2007-04-01), Kubota et al.

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