Wide-angle optical system for solid image pickup element

Details Wide-angle optical system for solid image pickup element Wide-angle optical system for solid image pickup element

2006-02-07

2006-02-07

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S708000

Reexamination Certificate

active

06995928

ABSTRACT:
In a wide-angle optical system for a solid image pickup element, an image pickup lens2is a biconvex lens, and its surface closer to an image surface is being formed into such an aspherical shape that the positive refractive power is weaker at a location more spaced in a diametrical direction apart from an optical axis. Further, the image pickup lens2satisfies the following condition expression (1):in-line-formulae description="In-line Formulae" end="lead"?1.3≧|r1/r2|≧0.8  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein r1is a radius of curvature of a surface of the image pickup lens closer to an object, and r2is a radius of curvature of the surface of the image pickup lens closer to the image surface. Thus, the distortion can be corrected appropriately.

REFERENCES:
patent: RE34455 (1993-11-01), Arai et al.
patent: 6392820 (2002-05-01), Shijo et al.

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