Projection lens with high resolution and reduced overall length

Details Projection lens with high resolution and reduced overall length Projection lens with high resolution and reduced overall length

2007-12-07

2010-06-22

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S717000, C359S749000

Reexamination Certificate

active

07742243

ABSTRACT:
An exemplary projection lens includes, in this order from the magnification side to the minification side thereof, a negative lens group of negative fraction power, and a positive lens group of positive fraction power. The projection lens satisfies the formulas of: −2.5<F1/F<−1.5; and 1.3<F2/F<1.5, where F1, F2, and F respectively represent the effective focal lengths of the negative lens group, the positive lens group, and the projection lens.

REFERENCES:
patent: 5731912 (1998-03-01), Abe
patent: 5999337 (1999-12-01), Ozaki
patent: 6147812 (2000-11-01), Narimatsu et al.
patent: 2003/0090815 (2003-05-01), Chang
patent: 2007/0058267 (2007-03-01), Kawana

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