Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2007-07-03
2007-07-03
Dowling, William C. (Department: 2851)
Optics: image projectors
Polarizer or interference filter
C353S031000, C349S009000, C359S634000
Reexamination Certificate
active
11009053
ABSTRACT:
The present invention provides a projection type image display device capable of affording a bright display of a high saturation and capable of ensuring a high reliability of optical parts. The projection type image display device is provided with a color synthesizer for color-synthesizing modulated and polarized light of red light, green light, and blue light, outputted from an image display element. The color synthesizer has an optical characteristic such that the transmittance including reflection by a reflecting film in the interior of the color synthesizer becomes highest for the polarized light of blue light out of the modulated and polarized light of red light, that of green light, and that of blue light. The color synthesizer also has an optical characteristic such that the quantity of the polarized light of blue light outputted becomes largest out of the modulated and polarized light of red light, green light, and blue light.
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Hirata Koji
Nakashima Tsutomu
Yatsu Masahiko
Antonelli, Terry Stout & Kraus, LLP.
Dowling William C.
Hitachi , Ltd.
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