Patent US5084807A successfully refreshed from Google Patents.
US5084807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illumination system for LCD projection television
Assignee: US Philips Corp
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Filing: 1989-04-14
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Granted: 1992-01-28
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Expires: 2009-04-14
Abstract
Abstract The present invention is directed to illumination structures useful in display systems for projection video and television devices performing with high efficiency and good color rendition. Such illumination sources include a light source having an inner and outer envelope with plane mirrors within the outer envelope to direct reflected light, a light source providing randomly polarized light with polarizing structure for passing a desired polarization of the polarized light, and an arc lamp having at least two arcs for supplying uniform illumination in two dimensions. These illuminating structures enable significantly improved illumination in the appropriate projection video and television systems.
Inventors
- 👤 Thomas S. McKechnie
- 👤 Jill F. Goldenberg
- 👤 Joshua D. Eskin
- 👤 Jeffrey Shimizu
- 👤 Ralph H. Bradley, Jr.
- 👤 William F. Guerinot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:51
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/315
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
An illumination device comprising (a) light source means including at least two active areas for producing uniform illumination in two dimensions, said active areas each being one of an xenon arc or a metal halide arc, (b) at least one reflector means for increasing said uniform illumination by reflecting light from said light source means, and (c) condenser lens means for passing light from said light source means and said reflector means, said at least one reflector means reflecting light not originally passing from said light source means to said condenser lens means.
Claim 2
Dependent Claim
93 words
An illumination device comprising (a) light source means including at least two active areas for producing uniform illumination in two dimensions, said active areas each being one of an xenon arc or a metal halide arc, (b) at least one reflector means for increasing said uniform illumination by reflecting light from said light source means, and (c) condenser lens means for passing light from said light source means and said reflector means, said at least one reflector means reflecting light not originally passing from said light source means to said condenser lens means.
Claim 3
Dependent Claim
18 words
An illumination device according to claim 1, wherein each of said active areas is a metal halide arc.
Claim 4
Dependent Claim
22 words
An illumination device according to claim 2, wherein each of said active areas has a length ranging from 0.3 to 1.5 inches.
Claim 5
Dependent Claim
20 words
An illumination device according to claim 3, wherein each of said active areas is at at most about 1.06 inches.
Claim 6
Dependent Claim
17 words
An illumination device according to claim 2, wherein said light source means is a 250 watt lamp.
Claim 7
Dependent Claim
17 words
An illumination device according to claim 1, wherein each of said active areas is an xenon arc.
Claim 8
Dependent Claim
19 words
An illumination device according to claim 6, wherein said xenon arc has an arc length of about 1 mm.
Claim 9
Dependent Claim
17 words
An illumination device according to claim 1, wherein each of said active areas maximizes light collection efficiency.
Claim 10
Dependent Claim
28 words
An illumination device according to claim 1, wherein said reflector means directs light between said active areas so that said condenser means images twice as many light images.
Claim 11
Dependent Claim
40 words
An illumination device according to claim 1, wherein said light source means directs light radially in substantially all directions including through said condenser lens means, and wherein said reflector means reflects light not originally passing through said condenser lens means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |