Polarization beam splitting optical system
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United States of America Patent
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Jan 31, 2006
Grant Date -
Sep 23, 2004
app pub date -
Jan 28, 2004
filing date -
Jan 31, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A polarization beam splitting optical system is disclosed which reduces components of the P-polarization direction that are contained in polarized light that is analyzed upon being incident on a polarization splitting film in an inclined manner with respect to an optical axis of an optical system. This optical system includes a polarization splitting film, which guides polarized light from a first optical system to a reflection type image display element and then analyzes and guides polarized light from the image display element to a projection optical system. When δ is the phase difference of P-polarized light and S-polarized light at the polarization splitting film, the polarization splitting film satisfies the condition: 120°≦|δ|≦180°.
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