Projection lens system

Details Projection lens system Projection lens system

2011-04-19

2011-04-19

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S753000, C359S714000

Reexamination Certificate

active

07929217

ABSTRACT:
The present disclosure relates to a projection lens. The projection lens includes, in order from the magnified end to the minified end thereof, a first lens of negative refraction power, a second lens of positive refraction power, a third lens of negative refraction power, a fourth lens of positive refraction power, and a fifth lens of positive refraction power. The forth lens and the third lens are bonded to integrally form a compound lens of negative refraction power. The projection lens satisfies the following condition: 0.4<R12/f<0.9. Wherein, R12is a radius of curvature of the surface at the minified end of the first lens, f is an effective focal length of the projection lens.

REFERENCES:
patent: 6236521 (2001-05-01), Nanba
patent: 2009/0316276 (2009-12-01), Hsu et al.

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