Polarization beam splitter, polarization converter, and projector
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United States of America Patent
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Jun 26, 2001
Grant Date -
N/A
app pub date -
Feb 19, 1999
filing date -
Feb 25, 1998
priority date (Note) -
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Abstract
A technique for improving properties of polarizing beam splitters and polarizing conversion elements, and a projection display apparatus having high light utilization efficiency using such polarizing beam splitters are provided. A polarizing beam splitter in accordance with the present invention includes a light transmissive substrate having a refractive index ranging from approximately 1.48 to 1.58, and a polarization separating film formed on the light transmissive substrate. The polarization separating film includes a multilayered structural section formed by alternately arranging MgF.sub.2 layers and MgO layers. The polarization separating film in accordance with the present invention can improve the transmission property and the reflection property with respect to two types of polarized light. Also, by using the polarization separating film for a polarizing conversion element or a projection display apparatus, it is possible to provide a polarizing conversion element or a projection display apparatus having high light utilization efficiency.
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