Polarization conversion device, polarization conversion unit, and projection type video apparatus
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United States of America Patent
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Apr 7, 2015
Grant Date -
Jul 26, 2012
app pub date -
Dec 7, 2011
filing date -
Jan 21, 2011
priority date (Note) -
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Abstract
A polarization separation device includes a transmissive substrate formed of crystalline material having a birefringent property and an optical rotatory property, and a polarization separation portion that is provided on an incidence-side surface of the transmissive substrate and transmits P-polarized light and reflects S-polarized light. A reflective element, which reflects the S-polarized light reflected by the polarization separation portion, is disposed substantially in parallel with the transmissive substrate. A phase difference plate is disposed at an emission-side of the transmissive substrate. The P-polarized light, which is transmitted through the polarization separation portion and is incident to the transmissive substrate, is made to be emitted from an emission-side surface of the transmissive substrate while maintaining a polarization plane thereof, and the polarization plane of the P-polarized light transmitted through the transmissive substrate is converted to be as S-polarized light in the phase difference plate.
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