Wide-angle optical system for solid-state image pickup device

Details Wide-angle optical system for solid-state image pickup device Wide-angle optical system for solid-state image pickup device

2006-12-19

2009-02-24

Sugaman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S112230

Reexamination Certificate

active

07495844

ABSTRACT:
It is to provide a wide-angle optical system for a solid image pickup device that favorably corrects distortion. The imaging lens is a biconvex lens, the object side face is formed into an aspheric shape in which the negative refracting power becomes stronger the farther the imaging lens is from an optical axis in the radial direction, and a condition expressed by the following expression (1) is to be satisfied;in-line-formulae description="In-line Formulae" end="lead"?0.8>|r1/r2|≧0.5  (1)in-line-formulae description="In-line Formulae" end="tail"?where,r1: center radius curvature of the object side face of the imaging lensr2: center radius curvature of the image surface side face of the imaging lens.

REFERENCES:
patent: 6344935 (2002-02-01), Maruyama
patent: 6888686 (2005-05-01), Do

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