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US 7,095,538 B2Granted
Band-pass filter and image display apparatus
AssigneeMinolta Co., Ltd.
InventorsTetsuya Noda, Yasushi Tanijiri, Takeshi Endo, Hiroaki Ueda
Life of this patent
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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.
Claims11
A band-pass filter comprising:
- 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.
A band-pass filter comprising:
- 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.
Dependencies are inferred from the claim text.