Optical lens system for taking image

Details Optical lens system for taking image Optical lens system for taking image

2007-01-16

2008-10-14

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S785000

Reexamination Certificate

active

07436603

ABSTRACT:
An optical lens system for taking image comprises three lens elements with refractive power, from the object side to the image side: a first positive lens element having a convex front surface and a concave rear surface, and the front surface being aspheric; a negative plastic second lens element having a concave front surface and a convex rear surface, and the front and rear surfaces thereof being aspheric; a positive plastic third lens element having a convex front surface and a concave rear surface, the front and rear surfaces thereof being aspheric; and an aperture stop located between the first and second lens elements for controlling brightness of the optical system. The focal length of the first lens element is f1, the focal length of the optical lens system is f, and they satisfy the relations: f/f1<0.9.

REFERENCES:
patent: 6927927 (2005-08-01), Isono
patent: 7262925 (2007-08-01), Huang
patent: 7274518 (2007-09-01), Tang et al.
patent: 2005/0264671 (2005-12-01), Isono et al.
patent: 2006/0146423 (2006-07-01), Amanai
patent: 2008/0100926 (2008-05-01), Chen et al.

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