Prism unit and projector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jan 9, 2018
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N/A
app pub date -
Sep 21, 2015
filing date -
Sep 19, 2014
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Abstract
A prism unit that combines light in the three primary colors of R, G, and B on the same optical axis includes: a G-reflecting dichroic coating that reflects G light and passes R and B light; and an RB dichroic coating that reflects one of R and B, and passes the other one of R and B, the prism unit satisfying the following conditional expression: λrg≧λrb≧0.67×λrg+0.33×λgb, where λgb represents the wavelength at which the transmittance is 50% when the colors of G and B on the composite optical axis are combined, λrg represents the wavelength at which the transmittance is 50% when the colors of R and G on the composite optical axis are combined, and λrb represents the wavelength at which the transmittance is 50% when the colors of R and B on the composite optical axis are combined.
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