Polarization beam splitter and projection display apparatus

Details Polarization beam splitter and projection display apparatus Polarization beam splitter and projection display apparatus

1994-06-01

1995-09-26

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

353 20, 359487, 359498, 359583, 359588, G02B 530, G02B 2728, G03B 2114, G02F 11335

Patent

active

054538599

ABSTRACT:
A polarization beam splitter which includes a first prism, a second prism, and a dielectric multilayer film which is sandwiched between the first and second prisms is disclosed. The dielectric multilayer film comprising: a plurality of high refractive index layers having a refractive index higher than refractive indices of the first and second prisms; a plurality of intermediate refractive index layers having a refractive index lower than the refractive index of the high refractive index layers; and a plurality of low refractive index layers having a refractive index lower than the refractive index of the intermediate refractive index layers, a reference incident angle .theta..sub.0 of light which is incident on the dielectric multilayer film through the first or second prism being within a range of the following expression:

REFERENCES:
patent: 2403731 (1946-07-01), MacNeille
patent: 3346319 (1967-10-01), Billings
patent: 3622225 (1971-11-01), Buchman et al.
patent: 4461542 (1984-07-01), Gagnon
patent: 4544237 (1985-10-01), Gagnon
patent: 4553822 (1985-11-01), Mahlein
patent: 4733926 (1988-03-01), Title
patent: 4966438 (1990-10-01), Mouchart
patent: 4974219 (1990-11-01), Korth
patent: 5357370 (1994-10-01), Miyatake et al.

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