Projection zoom lens system and projection type display...

Details Projection zoom lens system and projection type display... Projection zoom lens system and projection type display...

2009-12-07

2011-12-06

Martinez, Joseph P (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S770000

Reexamination Certificate

active

08072690

ABSTRACT:
In order from a magnification side of the projection zoom lens system, five lens groups are arranged. The fourth lens group includes, in order from the magnification side, a negative lens having at least one aspheric surface, a positive lens, a negative lens concave toward the magnification side, a positive lens convex toward the reduction side, and a positive lens. The fifth lens group is formed of one lens, and is configured so that a ratio of a focal length of the fifth lens group to a focal length of the whole system at a wide-angle end is within a numerical range of 3 to 8.

REFERENCES:
patent: 2007/0121214 (2007-05-01), Kuo
patent: 2001-91829 (2001-04-01), None
patent: 2001-100100 (2001-04-01), None

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