Polarized beam splitter and an illumination optical system and a projector provided with a polarized beam splitter
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Jun 30, 1998
filing date -
Jul 3, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A beam splitter for use in a projector is provided with a first transparent base; a second transparent base; and a polarizing multilayered film placed between the first and second transparent bases. The polarizing multilayered film includes high refraction layers each having a refractive index n.sub.H and low refraction layers each having a refractive index n.sub.L lower than the refractive index n.sub.H the high refraction layers and the low refraction layers being alternately laminated one another. The refractive index n.sub.H and the refractive index n.sub.L satisfies the following equation: ##EQU1##
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