Polarized beam splitter and an illumination optical system and a

Details Polarized beam splitter and an illumination optical system and a Polarized beam splitter and an illumination optical system and a

1998-06-30

1999-10-19

Dowling, William

Optics: image projectors

Polarizer or interference filter

353 34, 359498, 359583, G03B 2114

Patent

active

059676353

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##

REFERENCES:
patent: 5453859 (1995-09-01), Sannohe et al.
patent: 5579159 (1996-11-01), Ito
patent: 5625491 (1997-04-01), Von Gunten et al.
patent: 5648870 (1997-07-01), Mistutake
patent: 5872653 (1999-02-01), Schrenk et al.

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