Fixed focus lens

Details Fixed focus lens Fixed focus lens

2011-07-05

2011-07-05

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S715000, C359S772000

Reexamination Certificate

active

07974016

ABSTRACT:
A fixed focus lens includes, numbered in order of location from an object side to an image side, a first lens, a second lens, a third lens, and a fourth lens. The first lens is a biconvex lens with a positive refractive power, and the second lens is a convex-concave lens with a negative refractive power. The third lens is a concave-convex lens with a positive refractive power, and the fourth lens is an aspherical lens having a negative refractive power in the centre portion thereof and a positive refractive power at the periphery portion thereof. The fixed focus lens satisfies the condition: 1.0>|(1/r2−1/r1)|>0.6, where r1denotes the radius of curvature of a front surface of the second lens and r2denotes the radius of curvature of a rear surface of the first lens.

REFERENCES:
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patent: 7321474 (2008-01-01), Jo
patent: 7755854 (2010-07-01), Sano
patent: 2007/0188891 (2007-08-01), Shinohara
patent: 1737635 (2006-02-01), None

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