Optical lens system for taking image

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

2007-05-31

2008-12-23

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S784000

Reexamination Certificate

active

07468847

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 surface on the object side and a concave surface on the image side, and at least one of the object side and image-side surfaces being aspheric; a negative plastic second lens element having a concave surface on the object side and a convex surface on the image side, and the object-side and image-side surfaces thereof being aspheric; a positive plastic third lens element having a convex surface on the object side and a concave surface on the image side, the object-side and image-side surfaces thereof being aspheric; and an aperture stop located in front of the first lens element for controlling brightness of the optical lens system. A focal length of the second lens element is f2, a focal length of the optical lens system is f, and they satisfy the relation: 0.1<|f/f2|<0.74.

REFERENCES:
patent: 5071235 (1991-12-01), Mori et al.
patent: 7184225 (2007-02-01), Noda
patent: 7295384 (2007-11-01), Sato et al.
patent: 7301712 (2007-11-01), Kamo

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