Projection lens device and projector

Details Projection lens device and projector Projection lens device and projector

2006-04-04

2006-04-04

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C353S069000, C353S070000, C353S085000, C353S097000, C353S101000

Reexamination Certificate

active

07021772

ABSTRACT:
The invention provides a lens device and projector in which light passing through liquid crystal panels is projected on a screen using the lens device. The lens device includes a diaphragm mechanism. A telecentric optical system for the display device is provided between the diaphragm mechanism and the liquid crystal panels. An aperture of the diaphragm mechanism is positioned at a location where primary rays that are emitted from the liquid crystal panels parallel to an optical axis intersect with the optical axis. Contrast characteristics of the liquid crystal panels vary depending on angles and directions of incidence of rays of light. The aperture of the diaphragm mechanism is formed in a substantially triangular shape in accordance with the shape of the contrast characteristics.

REFERENCES:
patent: 5742436 (1998-04-01), Fürter
patent: 6619804 (2003-09-01), Davis et al.
patent: 6646716 (2003-11-01), Ramanujan et al.
patent: 06-059233 (1994-03-01), None
patent: 08-043729 (1996-02-01), None

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