Asymmetric aperture diaphragm placing structure for...

Details Asymmetric aperture diaphragm placing structure for... Asymmetric aperture diaphragm placing structure for...

2005-09-13

2005-09-13

Nguyen, Judy (Department: 2851)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C353S100000, C359S739000, C359S740000, C355S071000

Reexamination Certificate

active

06942349

ABSTRACT:
An asymmetric aperture diaphragm placing structure for a projection lens is provided for securing an asymmetric aperture diaphragm to a lens holder. The asymmetric aperture diaphragm includes a positioning part formed asymmetrical about the optical axis. The lens holder has a mating part adapted to engage the positioning part only in a state where the asymmetric aperture diaphragm is in a predetermined direction with respect to the optical axis. The asymmetric aperture diaphragm is secured to the lens holder in a state where the positioning part and the mating part engage each other.

REFERENCES:
patent: 6724546 (2004-04-01), Nishimae et al.
patent: 63-144319 (1988-06-01), None
patent: 06-011681 (1994-01-01), None
patent: 3137435 (2000-12-01), None
“DLP Projector System Optics Contrast-Enhancement Techniques”, Texas Instruments Application Report, Jun. 2001.

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