Color splitting/combining prism, and optical system and projector therewith
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United States of America Patent
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Jan 23, 2018
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app pub date -
Aug 26, 2016
filing date -
Feb 28, 2014
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Abstract
A color splitting/combining prism splits apart illumination light from a projector and combines together projection light from the projector. A part of the illumination light that is not used as the projection light passes through the color splitting/combining prism as OFF-light via an image display element in a direction different from the projection light. The color splitting/combining prism includes a dichroic film of which a cutoff wavelength, at which the dichroic film exhibits a transmittance of 50% when splitting two different colors between reflection and transmission, is provided in a wavelength range in which wavelength separation is possible for all of the illumination light, the projection light, and the OFF-light that are incident at different incidence angles respectively.
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