Title:
PROJECTION DISPLAY SYSTEM USING TWO LAMP SOURCES
Document Type and Number:
WIPO Patent Application WO2002084339
Kind Code:
A3
Abstract:
The invention relates to a projection display system comprising two lamp sources (32,46) each having a different geometric aligning means. By combining a first light source (32) having an annular cross-sectioned beam and a second light source (46) having a circular cross-sectioned beam sized to be identical to said annulus, a light beam is created that provides more light and greater beam uniformity than has heretofore been available using low cost components. The annular beam is produced by a first lamp apparatus having a rear spherical reflector (88) and a front parabolic reflector (84) oriented along an optical axis. The circular beam is produced by a second lamp apparatus having a front spherical reflector (104) and a rear parabolic reflector (106) and having an orientation orthogonal to said optical axis. When the two beams are combined at an oval-shaped flat reflector (52) positioned at a 45° angle to the optical axis, a complementary beam is formed which provides a highly efficient and uniformly distributed light source.
More Like This:
Inventors:
KANE ROBERT
Application Number:
PCT/IB2002/001246
Publication Date:
January 15, 2004
Filing Date:
April 05, 2002
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
International Classes:
G02B19/00; G03B21/00; G03B21/14; H04N5/74; (IPC1-7): G02B27/18; H04N5/74; H04N9/31
Domestic Patent References:
| WO2000065399A2 | 2000-11-02 |
Foreign References:
| GB1062545A | 1967-03-22 | |||
| EP0997768A2 | 2000-05-03 | |||
| EP0683425A1 | 1995-11-22 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 09 30 July 1999 (1999-07-30)
Download PDF: