Projection lens and projection type display device
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United States of America Patent
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Jun 30, 2015
Grant Date -
Oct 16, 2014
app pub date -
Apr 7, 2014
filing date -
Apr 12, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
When a single lens which includes a surface having the smallest effective beam diameter or a cemented lens is designated as a reference lens, a system substantially consisting of lenses disposed closer to a magnification side than the reference lens is designated as a front group, and a system substantially consisting of lenses disposed closer to a reduction side than the reference lens is designated as a rear group, the projection lens satisfying conditional expressions (1) and (2) given below as well as conditional expressions (3) and (4): 75<2ω(1), βP<10 (2), |fM/fF|<2.0 (3), and |fM/fR|<2.0 (4).
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Cited Art Landscape
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