Projection type display apparatus and lighting device

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United States of America Patent

PATENT NO 9693026
APP PUB NO 20150201172A1
SERIAL NO

14593052

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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In a projection type display apparatus, a lighting device includes two reflection type cutoff filters (first cutoff filter and reflective second cutoff filter) which block out ultraviolet range light on an output optical path from a light source. A cut on wavelength of the second cutoff filter on the front side is longer than that of the first cutoff filter on the rear side. The two cutoff filters are formed on planar-shaped first faces of a first integrator lens and a second integrator lens. For this reason, both input faces of the two cutoff filters are orthogonal to an apparatus optical axis.

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Patent Owner(s)

  • SEIKO EPSON CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirota, Takenori Chiba, JP 34 177
Kurosawa, Ryuichi Hara-mura, JP 38 409
Tomikawa, Naoki Fujimi-machi, JP 20 92

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