Compact imaging lens system

Details Compact imaging lens system Compact imaging lens system

2007-09-07

2009-10-06

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S735000

Reexamination Certificate

active

07599129

ABSTRACT:
A compact imaging lens system includes, in order from the object side to the image side, a first lens (1) of negative refractive power, a free-form surface prism (2) of positive refractive power and a second lens (3) of positive refractive power. The free-form surface prism has an incidence surface (S3), a reflection surface (S4) and an exit surface (S5). The first lens is disposed on the side of the incidence surface, and the second lens is disposed on the side of the exit surface. The free-form surface prism functions equivalent to a right-angle prism with aspheric surfaces.

REFERENCES:
patent: 4493537 (1985-01-01), Nakahashi
patent: 4525038 (1985-06-01), Muller
patent: 5251073 (1993-10-01), Schauss
patent: 6323892 (2001-11-01), Mihara
patent: 6788343 (2004-09-01), Takayoshi
patent: 7508597 (2009-03-01), Liao
patent: 2002/0041445 (2002-04-01), Nishioka et al.
patent: 2004/0027475 (2004-02-01), Kamo
patent: 2008/0062538 (2008-03-01), Liao

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