Projection lens and optical projector provided with the same

Details Projection lens and optical projector provided with the same Projection lens and optical projector provided with the same

2006-07-11

2006-07-11

Perkey, W. B. (Department: 2851)

Photocopying

Projection printing and copying cameras

Illumination systems or details

C355S055000, C359S761000, C359S663000

Reexamination Certificate

active

07075622

ABSTRACT:
A fixed-focus projection lens2comprises practically six lenses; a single lens having negative refracting power serving as a first lens10,a single lens having positive refracting power serving as a second lens20,a single lens having negative refracting power serving as a third lens30,a compound lens having positive refracting power, consisting of a first component lens41and a second component lens42,and serving as a fourth lens40,and a single lens having positive refracting power serving as a fifth lens50,arranged in that order from the side of a screen toward a display device. A surface11,on the side of the display device, of the first lens10,and a surface41,on the side of the display device, of the second component lens42of the fourth lens40are aspherical.

REFERENCES:
patent: 5946144 (1999-08-01), Yamamoto
patent: 2002/0176058 (2002-11-01), Yasui et al.
patent: 2004/0051964 (2004-03-01), Endo et al.
patent: A 2000-137165 (2000-05-01), None

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