Picture-taking lens, image pick-up unit and hand-held device

Details Picture-taking lens, image pick-up unit and hand-held device Picture-taking lens, image pick-up unit and hand-held device

2005-10-27

2009-02-03

Ye, Lin (Department: 2622)

Television

Camera, system and detail

Optics

C359S773000

Reexamination Certificate

active

07486328

ABSTRACT:
A picture-taking lens for forming an image of an object image on a solid picture-taking element, comprising in order from the object side: a first lens having a positive refractive power and directing a convex surface toward the object side; an aperture stop, a second lens having a positive refractive power and a meniscus shape directing a convex surface toward the image side; and a third lens having a negative refractive power and directing a concave surface toward the image side, wherein the picture-taking lens satisfies the following conditional expression: 0.20<R1/f<0.42, 0.10<D2/f<0.40, where R1is a radius of curvature of the object side surface of the first lens, D2is an air gap on the axis between the first lens and the second lens, f is a focal length of a whole system of the picture-taking lens.

REFERENCES:
patent: 5940219 (1999-08-01), Yamada
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patent: 6560041 (2003-05-01), Ikeda et al.
patent: 7061695 (2006-06-01), Cahall et al.
patent: 7304807 (2007-12-01), Isono
patent: 2003/0210475 (2003-11-01), Shinohara
patent: 2005/0013018 (2005-01-01), Ning
patent: 2004-163786 (2004-06-01), None
European Search Report.

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