Light reflective polarizer and projector using the same
First Claim
Patent Images
1. A projector, comprising:
- a light source device;
an electro-optic device that modulates light emitted from the light source device;
two polarizers that are disposed respectively on a light incoming side and a light outgoing side of the electro-optic device; and
a projection optical system that projects light output from the electro-optic device, wherein at least one of the two polarizers includes a structural birefringent polarizing plate having a fine periodic structure periodically formed in a predetermined direction, and a polarizing plate arranged on a light outgoing side of the structural birefringent polarizing plate.
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Abstract
The present invention provides a projector that stably displays high-contrast, bright images by improving light resistance and heat resistance of a polarizer. The projector includes: a light source device; an electro-optic device that modulates light emitted from the light source device; two polarizers that are disposed respectively on a light incoming side and a light outgoing side of the electro-optic device; and a projection optical system that projects light output from the electro-optic device. At least one of the two polarizers is a structural birefringent polarizing plate.
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Citations
24 Claims
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1. A projector, comprising:
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a light source device;
an electro-optic device that modulates light emitted from the light source device;
two polarizers that are disposed respectively on a light incoming side and a light outgoing side of the electro-optic device; and
a projection optical system that projects light output from the electro-optic device, wherein at least one of the two polarizers includes a structural birefringent polarizing plate having a fine periodic structure periodically formed in a predetermined direction, and a polarizing plate arranged on a light outgoing side of the structural birefringent polarizing plate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
a light transmissive crystal substrate; and
the fine periodic structure formed on the light transmissive crystal substrate.
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4. The projector in accordance with claim 1, wherein the polarizing plate arranged on the light outgoing side of the structural birefringent polarizing plate is a light absorbing polarizing plate.
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5. The projector in accordance with claim 4, wherein a light transmissive crystal substrate is further arranged on a light outgoing side of the light absorbing polarizing plate, and the light transmissive crystal substrate is appressed to the light absorbing polarizing plate.
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6. The projector in accordance with claim 1, wherein the polarizing plate arranged on the light outgoing side of the structural birefringent polarizing plate is a light reflective polarizing plate.
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7. The projector in accordance with claim 6, wherein the light reflective polarizing plate is a multi-layered polarizing plate that is obtained by alternatively laminating a birefringent film and non-birefringent film.
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8. A projector, comprising:
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a light source device;
an electro-optic device that modulates light emitted from the light source device;
two polarizers that are disposed respectively on a light incoming side and a light outgoing side of the electro-optic device; and
a projection optical system that projects light output from the electro-optic device, wherein at least one of the two polarizers is a structural birefringent polarizing plate having a fine periodic structure periodically formed in a predetermined direction, and the structural birefringent polarizing plate is inclined to a center axis of light illuminating the electro-optic device. - View Dependent Claims (9)
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10. A projector, comprising:
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a light source device;
an electro-optic device that modulates light emitted from the light source device;
two polarizers that are disposed respectively on a light incoming side and a light outgoing side of the electro-optic device; and
a projection optical system that projects light output from the electro-optic device, wherein at least one of the two polarizers is a structural birefringent polarizing plate having a fine periodic structure periodically formed in a predetermined direction, and the structural birefringent polarizing plate is divided into a plurality of areas, and at least one of the plurality of areas is inclined to a center axis of light illuminating the electro-optic device. - View Dependent Claims (11)
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12. A polarizer, comprising:
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a first prism having a light incoming surface and a light outgoing surface, which face to each other in a non-parallel orientation; and
a light reflective polarizing plate that is disposed on a side of the light outgoing surface of the first prism, wherein the light reflective polarizing plate divides light emitted from the first prism into first and second polarized lights having different polarizing directions, and transmits the first polarized light while reflecting the second polarized light, an angle defined by the light incoming surface and the light outgoing surface of the first prism is set to cause the second polarized light, which has been reflected by the light reflective polarizing plate and returned to the first prism, to be totally reflected by the light incoming surface, and the first polarized light transmitted through the light reflective polarizing plate is to travel in a direction different from the direction of light entering the light reflective polarizing plate. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A polarizer, comprising:
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a first prism having a light incoming surface and a light outgoing surface, which face to each other in a non-parallel orientation; and
a light reflective polarizing plate that is disposed on a side of the light outgoing surface of the first prism, wherein the light reflective polarizing plate divides light emitted from the first prism into first and second polarized lights having different polarizing directions, and transmits the first polarized light while reflecting the second polarized light, and an angle defined by the light incoming surface and the light outgoing surface of the first prism is set to cause the second polarized light, which has been reflected by the light reflective polarizing plate and returned to the first prism, to be totally reflected by the light incoming surface, the polarizer further comprising;
a second prism, which is disposed on a light outgoing side of the light reflective polarizing plate to receive the first polarized light transmitted through the light reflective polarizing plate, wherein the second prism is arranged to make a traveling direction of the first polarized light emitted via the second prism substantially coincide with a traveling direction of light entering the first prism. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification