Reflection type overhead projector
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United States of America Patent
Stats
-
Apr 27, 1993
Grant Date -
N/A
app pub date -
Jul 19, 1991
filing date -
Feb 22, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mirror Fresnel lens (12) is disposed on a base (11), on which a liquid crystal display (18) is mounted. The liquid crystal display (18) is provided with a polarization plate (24) only in the mirror Fresnel lens (12) side. Light from a light source (15) passes through the liquid crystal display (18), is reflected by the mirror Fresnel lens (12), again passes through the liquid crystal display (18), is converged by a projection lens 16 and reflected by the mirror (17) and eventually arrives at a screen (20). A separated polarization plate (25) is provided in a manner to overlap with the projection lens 16. The separated polarization plate (25) is paired with the polarization plate (24).
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International Classification(s)
Cited Art Landscape
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