Projection lens and projection display apparatus
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United States of America Patent
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Jan 20, 2015
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N/A
app pub date -
Mar 26, 2014
filing date -
Apr 12, 2013
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Abstract
A projection lens that projects image information displayed on the reduction side conjugate position onto the magnification side conjugate position includes an aspherical lens having a positive refractive power that satisfies predetermined conditional expressions and, when the back focus of the entire system is taken as Bf, the focal length of the entire system is taken as f, the maximum effective image circle diameter on the reduction side is taken as Imφ, and the distance from the reduction side conjugate position to the reduction side pupil position is taken as dexp, satisfies conditional expressions (6): Bf/f>2 and (7): 0.5<|Imφ/dexp|<1.
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