Beam-combining device and color image projection apparatus provi

Details Beam-combining device and color image projection apparatus provi Beam-combining device and color image projection apparatus provi

1995-05-05

1996-10-08

Dowling, William

Optics: image projectors

Distortion compensation

353 37, G03B 2100

Patent

active

055623344

ABSTRACT:
An optical device for combining at least two sub-beams (b.sub.G, b.sub.R, b.sub.B) of different colours to one colour beam (b.sub.C) is described, which device comprises at least one colour-selective reflector which is arranged on a transparent plate-shaped substrate. By using a correction element composed of a first sub-element chosen from the group of cylindrical lens and obliquely arranged spherical lens, and a second sub-element chosen from the group of plane-parallel plate, wedge and prism, aberrations caused by the substrate in a sub-beam can be corrected.

REFERENCES:
patent: 3253505 (1966-05-01), Miller
patent: 4615595 (1986-10-01), Hornbeck
patent: 4754272 (1988-06-01), Illenberg et al.
patent: 4969730 (1990-11-01), Van Den Brandt
patent: 5046837 (1991-09-01), Stroomer et al.
patent: 5084807 (1992-01-01), McKechnie et al.
patent: 5231431 (1993-07-01), Yano et al.

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