Optical reflection polarizer and projector comprising the same
First Claim
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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, at least one of the two polarizers comprising;
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.
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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.
59 Citations
13 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, at least one of the two polarizers comprising;
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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, at least one of the two polarizers including a plurality of polarizer elements, each polarizer element comprising;
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 plurality of polarizer elements are jointed in such a manner that the respective light incoming surfaces of the first prisms are located in a virtually same plane, wherein in the each polarizer element, the light reflective polarizing plate divides light emitted from the first prism into first and second polarized lights having different polarizing directions, and transmitting 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.
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13. A polarizer comprising a plurality of polarizer elements, each polarizer element 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 plurality of polarizer elements are jointed in such a manner that the respective light incoming surfaces of the first prisms are located in a virtually same plane, wherein in the each polarizer element, the light reflective polarizing plate divides light emitted from the first prism into first and second polarized lights having different polarizing directions, and transmitting 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.
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Specification