Band-pass filter and image display apparatus
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Accused Products
Abstract
A band-pass filter has a reflecting optical element having a fixed reflection angle selection region for wavelengths of a given region, and has an optical path such that reflection is performed at least once and transmission is performed at least once at the reflecting optical element.
7 Citations
33 Claims
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1-22. -22. (canceled)
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23. A band-pass filter comprising:
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first and second reflecting optical elements, each of the first and second reflecting optical elements having a fixed reflection angle selection region for wavelengths of a given region, the band-pass filter being configured such that an optical path of an incident light beam causes first a first transmission of the incident light beam by the first reflecting optical element and subsequently a first reflection of the incident light beam by the second reflecting optical element, wherein a wavelength distribution of the incident light beam is narrowed by the first transmission of the incident light beam and is cut by the first reflection of the incident light beam. - View Dependent Claims (24, 27, 29, 30, 32)
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25. A band-pass filter comprising:
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first and second reflecting optical elements, each of the first and second reflecting optical elements having a fixed reflection angle selection region for wavelengths of a given region, the band-pass filter being configured such that an optical path of an incident light beam causes first a first reflection of the incident light beam by the first reflecting optical element and subsequently a first transmission of the incident light beam by the second reflecting optical element, wherein a wavelength distribution of the incident light beam is narrowed by the first reflection of the incident light beam and is cut by the first transmission of the incident light beam. - View Dependent Claims (26, 28, 31, 33)
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Specification