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US 2011/0032487 A1Published application
Color splitter and combiner system and projection display apparatus
AssigneeCanon Kabushiki Kaisha
InventorKazuhiro INOKO
Life of this patent
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Abstract
A color splitter and combiner system includes a first transparent member located on an optical path between a first polarization beam splitter and an optical path combiner, and a second transparent member located on an optical path between a second polarization beam splitter and an optical path combiner. 0.05 (mm)<|t1/v1−t2/v2|<1.00 (mm) is met, where t1 is a thickness of the first transparent member, t2 is a thickness of the second transparent member, v1 is an Abbe number of a material of the first transparent member, and v2 is an Abbe number of a material of the second transparent member.
Claims6
A color splitter and combiner system comprising:
- a first polarization beam splitter configured to lead first color light to a first reflection type image display element and to analyze first reflected light from the first reflection type image display element;
- a second polarization beam splitter configured to lead second color light to a second reflection type image display element, to analyze second reflected light from the second reflection type image display element, and to lead third color light to a third reflection type image display element, and to analyze third reflected light from the third reflection type image display element;
- an optical path combiner configured to combine the first color light emitted from the first polarization beam splitter with the second color light and the third color light that are emitted from the second polarization beam splitter;
- a first transparent member located on an optical path between the first polarization beam splitter and the optical path combiner;
- and
- a second transparent member located on an optical path between the second polarization beam splitter and the optical path combiner,
- wherein 0.05 (mm)<|t1/v1−t2/v2|<1.00 (mm) is met, where t1 is a thickness of the first transparent member, t2 is a thickness of the second transparent member, v1 is an Abbe number of a material of the first transparent member, and v2 is an Abbe number of a material of the second transparent member.
4 more elements
A projection display apparatus comprising:
- a first reflection type image display element configured to display an image;
- a second reflection type image display element configured to display an image;
- a third reflection type image display element configured to display an image;
- an illumination optical system configured to illuminate the first, second and third reflection type image display elements using light from a light source;
- and
- a color splitter and combiner system, wherein the color splitter and combiner system includes:
- a first polarization beam splitter configured to lead first color light to a first reflection type image display element and to analyze first reflected light from the first reflection type image display element;
- a second polarization beam splitter configured to lead second color light to a second reflection type image display element, to analyze second reflected light from the second reflection type image display element, and to lead third color light to a third reflection type image display element, and to analyze third reflected light from the third reflection type image display element;
- an optical path combiner configured to combine the first color light emitted from the first polarization beam splitter with the second color light and the third color light that are emitted from the second polarization beam splitter;
- a first transparent member located on an optical path between the first polarization beam splitter and the optical path combiner;
- and
- a second transparent member located on an optical path between the second polarization beam splitter and the optical path combiner,
- wherein 0.05 (mm)<|t1/v1−t2/v2|<1.00 (mm) is met, where t1 is a thickness of the first transparent member, t2 is a thickness of the second transparent member, v1 is an Abbe number of a material of the first transparent member, and v2 is an Abbe number of a material of the second transparent member.
10 more elements
Dependencies are inferred from the claim text.