Dichroic mirror and projector having the same
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United States of America Patent
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-
Jul 15, 1997
Issued Date -
N/A
app pub date -
Aug 16, 1994
filing date -
Jul 26, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dichroic mirror for reflecting a beam of a given color includes a substrate and a multilayered film formed on the substrate. The multilayered film is constituted by a first dichroic reflecting layer, an intermediate layer, and a second dichroic reflecting layer sequentially from the beam incident side. The first dichroic reflecting layer has a smaller reflection range of one of two orthogonal polarized components of the beam than the other of the two orthogonal polarized components. The intermediate layer rotates a polarization plane of at least part of a beam of the one component of the beam passing through the first dichroic reflecting layer, and the second dichroic reflecting layer reflects the at least part of the beam whose polarization plane is rotated by the intermediate layer. A projector having the dichroic mirror is also disclosed.
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Cited Art Landscape
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