Parabolic dielectric multilayer reflector

Details Parabolic dielectric multilayer reflector Parabolic dielectric multilayer reflector

1994-04-25

1996-06-04

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 71, 359584, 359589, 313112, G02B 525, G02F 1335

Patent

active

055238629

ABSTRACT:
A reflector used for a light source material of a liquid crystal video projector provides a good projection image and causes no color shading to occur in the periphery of a screen. The reflector has a surface on which a dielectric multifilm coating is deposited. The reflector reflects only visible light beams and has a wavelength .lambda..sub.1, which has a spectral transmittance on a short wave side (with normal incidence) of 20% and is equal to or smaller than 440 nm and, at the same time, has a wavelength .lambda..sub.2, which has a spectral transmittance on a long wave side (with normal incidence) of 50% and is equal to or greater than 820 nm.

REFERENCES:
patent: 4861142 (1989-08-01), Tanaka et al.
patent: 5143445 (1992-09-01), Bateman et al.
patent: 5339198 (1994-08-01), Wheatley et al.
"Principles and Properties of Cold Mirrors," ISOMET Corporation, Technical Memorandum No. 1, Jan. 1965.

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