Lens system with small emergence angle

Details Lens system with small emergence angle Lens system with small emergence angle

2008-07-02

2009-06-16

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S772000, C359S771000

Reexamination Certificate

active

07548384

ABSTRACT:
A lens system includes a positive refractive power first lens, a negative refractive power second lens, a positive refractive power third lens, and a negative refractive power fourth lens in that order from the object side of the lens system. Wherein the lens system satisfies the following conditions: (1) D1/D2<1.6; and (2) R2/F1>1.8, wherein, D1 is the effective radius of a surface of the third lens facing the image side of the lens system, D2 is a distance from the top point of a surface to the optical center of the third lens, R2 is the radius of curvature of a surface of the first lens facing the image side of the lens system, and F1 is a focal length of the first lens.

REFERENCES:
patent: 5808815 (1998-09-01), Kouthoofd
patent: 2007/0242370 (2007-10-01), Fukuta et al.

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