Color separation element and projection apparatus

Details Color separation element and projection apparatus Color separation element and projection apparatus

1999-03-25

2000-06-06

Dowling, William

Optics: image projectors

Polarizer or interference filter

349 9, 359487, G03B 2114

Patent

active

060709820

ABSTRACT:
A color separation element includes a polarization dependent reflecting element having a different reflectivity dependent on a polarization plane and a wavelength of an incident light, and a polarization converting element, arranged at a predetermined angle to the polarization dependent reflecting element. The polarization converting element converts one linearly polarized light between a p-polarized light component and a s-polarized light component transmitted through the polarization dependent reflecting element into the other linearly polarized light which is reflected towards the polarization dependent reflecting element, and converts the other linearly polarized light between the p-polarized light component and the s-polarized light component transmitted through the polarization dependent reflecting element into the one linearly polarized light which is reflected towards the polarization dependent reflecting element.

REFERENCES:
patent: 4798448 (1989-01-01), van Raalte
patent: 5237446 (1993-08-01), Takahashi
patent: 5568315 (1996-10-01), Shuman
patent: 5650874 (1997-07-01), Shuman
patent: 5748369 (1998-05-01), Yokota
patent: 5748379 (1998-05-01), Salsman et al.
patent: 5784181 (1998-07-01), Loiseaux et al.
Patent Abstracts of Japan, vol. 199, No. 808, Jun. 30, 1998 & JP 10 062775 A (NEC Corp), Mar. 6, 1998 * abstract *.
Patent Abstracts of Japan, vol. 199, No. 811, Sep. 30, 1998 & JP 10 161255 A (Hitachi LTD), Jun. 19, 1998 * abstract *.

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