Lens system

Details Lens system Lens system

2011-02-15

2011-02-15

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S773000

Reexamination Certificate

active

07889441

ABSTRACT:
A lens system including sequentially, from an object side to an image side, a first lens of a biconvex type having two aspherical surfaces, a second lens of a biconcave type having at least one aspherical surface, a third lens having two aspherical surfaces and having a positive refracting power, and a fourth lens having two aspherical surfaces and having a negative refracting power.

REFERENCES:
patent: 2008/0180816 (2008-07-01), Nakamura
patent: 2002-365529 (2002-12-01), None
patent: 2005-208236 (2005-04-01), None
patent: 2008-185880 (2008-08-01), None
patent: 10-2008-0076207 (2008-08-01), None

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