Projection lens and projector

Details Projection lens and projector Projection lens and projector

2007-06-01

2009-10-27

Koval, Melissa J (Department: 2862)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C353S099000, C353S101000

Reexamination Certificate

active

07607785

ABSTRACT:
There is provided a projection lens for a projector which utilizes a reflection type display device, comprising a movable aperture70which is movable as a movable lens components moves, wherein an opening75in the movable aperture70is formed into a circular shape which is centered at the center of an optical axis69of the projection lens and has a swollen portion73on part of the opening75in such a manner as to project from a circumferential portion in a direction of the center of a beam of stray light into the interior of the opening75.

REFERENCES:
patent: 5047847 (1991-09-01), Toda et al.
patent: 6271974 (2001-08-01), Wachi
patent: 2004/0109236 (2004-06-01), Nishioka
patent: 01-133014 (1989-05-01), None
patent: 2001-188196 (2001-07-01), None
patent: 2003-322822 (2003-11-01), None
patent: 2004-157346 (2004-06-01), None
Japanese Office Action (and English translation thereof) dated May 8, 2008, issued in a counterpart Japanese Application.

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