Optical system for taking image

Details Optical system for taking image Optical system for taking image

2008-07-01

2008-07-01

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S716000, C359S784000

Reexamination Certificate

active

07394602

ABSTRACT:
An optical 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, a focal length of the second lens element is f2, a focal length of the optical system is f, and they satisfy the relations: f/f1>0.95, |f/f2|>0.34.

REFERENCES:
patent: 2007/0242369 (2007-10-01), Huang et al.

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