Projector lens system and projector apparatus
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United States of America Patent
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Apr 8, 2014
Grant Date -
Apr 11, 2013
app pub date -
Oct 9, 2012
filing date -
Oct 11, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A projector lens system is provided. The projector lens system comprising, in order from a screen side thereof: a first negative lens that is made of resin and is convex on the screen side; a first positive lens that is made of glass and is biconvex; a stop; a cemented lens that has negative refractive power and is composed, in order from the screen side, of a second negative lens that is made of glass and a second positive lens that is made of glass; and a third positive lens that is made of resin, wherein a refractive index n1 of the first negative lens, a refractive index n2 of the first positive lens, a refractive index n32 of the second positive lens, and a refractive index n4 of the third positive lens satisfy the following conditions: 1.45≦n1≦1.60; 1.45≦n4≦1.60; 0.16≦n2−n1≦0.31; 0.16≦n32−n4≦0.31; 0.95≦n1/n4≦1.05; and 0.95≦n2/n32≦1.05.
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