Light source unit and projector type display device using...

Details Light source unit and projector type display device using... Light source unit and projector type display device using...

2005-06-21

2005-06-21

O'Shea, Sandra (Department: 2875)

Illumination

Light source and modifier

Plural serial lens elements or components

C362S308000, C362S347000, C362S263000

Reexamination Certificate

active

06908218

ABSTRACT:
A light source unit is provided which includes a lamp and a reflector for reflecting rays of light emitted by a light emitting element of the lamp and for focusing the reflected rays of light. In order to focus on a predetermined focal point the rays of light emitted by the light emitting element of the lamp and refracted by a cross-sectional shape of the lamp, the reflector has a concave reflective shape formed so as to satisfy a predetermined calculation expression. Alternatively, a reflective surface shape of the reflector may be obtained by shifting portions of an ellipse and rotating a curve of the shifted portions around the optical axis of the light source unit.

REFERENCES:
patent: 4958909 (1990-09-01), Kubo
patent: 5243501 (1993-09-01), Makita et al.
patent: 5634704 (1997-06-01), Shikama et al.
patent: 6623145 (2003-09-01), Ishihara
patent: 2001-110217 (2001-04-01), None

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