Projection lens device and projector
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United States of America Patent
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-
Apr 4, 2006
Grant Date -
Jul 22, 2004
app pub date -
Nov 7, 2003
filing date -
Nov 7, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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