Lens system

Details Lens system Lens system

2007-11-15

2009-12-22

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

Reexamination Certificate

active

07636207

ABSTRACT:
A lens system includes a positive refractive power first lens, a positive refractive power second lens, and a negative refractive power third lens in that order from the object side of the lens system. Wherein the lens system satisfies the following conditions: (1) 0.25<R1F/F<0.5; (2) R2F<R2R<0; and (3) 0<R1F<R1R, wherein, R1R and R1F are radius of curvature of object side surface and image side surface of the first lens respectively, R2R and R2F are radius of curvature of object side surface and image side surface of the second lens respectively, and F is a focal length of the lens system.

REFERENCES:
patent: 5808815 (1998-09-01), Kouthoofd
patent: 6795253 (2004-09-01), Shinohara
patent: 2005/0002119 (2005-01-01), Nakamura
patent: 2007/0109668 (2007-05-01), Isono
patent: 1677153 (2005-10-01), None
DA Zhou. A new method of blacking the edge of the optical element Optics, Mechanics & Electronics Information, Aug. 1996, vol. 13, No. 8, pp. 27-28, The Chinese Optical Society, No. 3888 Dong nanhu Road. Changchun, 130033,China.

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