Illumination apparatus and a liquid crystal projector using...

Details Illumination apparatus and a liquid crystal projector using... Illumination apparatus and a liquid crystal projector using...

2005-03-15

2005-03-15

O'Shea, Sandra (Department: 2875)

Illumination

Light source and modifier

Including reflector

C362S298000, C362S304000, C349S009000, C353S122000

Reexamination Certificate

active

06866404

ABSTRACT:
An illumination apparatus includes a reflector including a parabolic or ellipsoidal mirror, a light source arranged near a (first) focal point of the reflector, and a front mirror having a transparent window and a mirror surface symmetrical about the light axis. Luminous flux emitted from the light source is reflected from the reflector. In the case of the parabolic mirror, the front mirror has the same size as an entrance of an output light utilizing optical system, and the luminous flux exits toward the optical system as collimated light. In the case of the ellipsoidal mirror, the front mirror is arranged between two focal points of the ellipsoidal mirror, and the luminous flux is directed toward the second focal point. However, at least one part of the luminous flux is reflected from the front mirror and returned toward the first focal point.

REFERENCES:
patent: 3676667 (1972-07-01), Malifaud
patent: 4735495 (1988-04-01), Henkes
patent: 5142387 (1992-08-01), Shikama et al.
patent: 6497488 (2002-12-01), Yamauchi et al.
patent: 03111806 (1991-05-01), None
patent: 05264904 (1993-10-01), None
patent: 10161065 (1998-06-01), None
patent: 2001066697 (2001-03-01), None

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