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Patent US6170953B1 successfully refreshed from Google Patents.
US6170953B1
Expired / Lapsed
US
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Laser video projector for projecting image to a plurality of screens
Assignee: Samsung Electronics Co Ltd
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Filing: 1999-03-22
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Granted: 2001-01-09
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Expires: 2019-03-22
Abstract
Abstract A laser video projector for projecting an image to a plurality of screens is provided. It is possible to display an identical image to a plurality of screens by modulating light from the light source by an acousto-optic modulator (AOM) according to a video signal and projecting video information to a plurality of screens using a scanner. The laser video projector includes a light source for outputting a beam of white light, a light separator for separating the beam of the white light into beams of monochromatic lights having first, second, and third wavelengths, a light modulator for modulating the beams of the monochromatic lights according to a chrominance signal, a light combiner for combining the monochromatic lights modulated by the light modulator into a beam, a light scanner for scanning the combined beam of the modulated monochromatic lights, thus forming an image, a multi-screen projecting optical system for changing the light path so that the image formed by the light scanner is displayed on multiple screens, and a plurality of screens corresponding to the plurality of images.
Inventors
- 👤 Jin-ho Lee
- 👤 Young-mo Hwang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:02
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3129
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
132 words
A laser video projector for projecting an image to a plurality of screens, comprising: a light source for outputting a beam of white light; light separating means for separating the beam of the white light into beams of monochromatic lights having first, second, and third wavelengths; light modulating means for modulating the beams of the monochromatic lights according to a chrominance signal; light combining means for combining the monochromatic lights modulated by the light modulating means into a beam; light scanning means for scanning the combined beam of the modulated monochromatic lights, thus forming an image; a multi-screen projecting optical system for changing the light path so that the image formed by the light scanning means is displayed on multiple screens; and a plurality of screens corresponding to the plurality of images.
Claim 2
Dependent Claim
132 words
A laser video projector for projecting an image to a plurality of screens, comprising: a light source for outputting a beam of white light; light separating means for separating the beam of the white light into beams of monochromatic lights having first, second, and third wavelengths; light modulating means for modulating the beams of the monochromatic lights according to a chrominance signal; light combining means for combining the monochromatic lights modulated by the light modulating means into a beam; light scanning means for scanning the combined beam of the modulated monochromatic lights, thus forming an image; a multi-screen projecting optical system for changing the light path so that the image formed by the light scanning means is displayed on multiple screens; and a plurality of screens corresponding to the plurality of images.
Claim 3
Dependent Claim
79 words
The laser video projector of claim 1 , wherein the light separating means comprises: a first dichroic mirror for reflecting at least 99% of monochromatic light of a first wavelength from the beam of the white light and transmitting at least 95% of monochromatic light of second and third wavelengths; and a second dichroic mirror for reflecting at least 99% of monochromatic light of the second wavelength and transmitting at least 95% of monochromatic light of the third wavelength.
Claim 4
Dependent Claim
32 words
The laser video projector of claim 2 , wherein the light separating means further comprises a high reflection mirror for reflecting at least 99% of the monochromatic light of the third wavelength.
Claim 5
Dependent Claim
32 words
The laser video projector of claim 1 , wherein the light modulating means comprises three acousto-optic modulators for modulating the beams of the monochromatic lights of the first, second, and third wavelengths.
Claim 6
Dependent Claim
67 words
The laser video projector of claim 1 , wherein the light combining means comprises: a third dichroic mirror for transmitting the beam of the monochromatic light of the first wavelength and reflecting the beam of the monochromatic light of the second and third wavelengths; and a fourth dichroic mirror for reflecting the monochromatic light of the second wavelength and transmitting the monochromatic light of the third wavelength.
Claim 7
Dependent Claim
28 words
The laser video projector of claim 5 , wherein the light combining means further comprises a high reflection mirror for reflecting the monochromatic light of the third wavelength.
Claim 8
Dependent Claim
45 words
The laser video projector of claim 1 , wherein the light scanning means comprises: vertical scanning means for vertically scanning the combined beam output from the light combining means; and horizontal scanning means for horizontally scanning the combined beam output from the vertical scanning means.
Claim 9
Dependent Claim
16 words
The laser video projector of claim 7 , wherein the vertical scanning means comprises a galvanometer.
Claim 10
Dependent Claim
17 words
The laser video projector of claim 7 , wherein the horizontal scanning means comprises a polygonal mirror.
Claim 11
Dependent Claim
45 words
The laser video projector of claim 7 , further comprising relay lenses for controlling the vertically scanned combined beam to be incident on the effective area of the horizontal scanning means on a light path between the vertical scanning means and the horizontal scanning means.
Claim 12
Dependent Claim
34 words
The laser video projector of claim 7 , further comprising a fθ lens for correcting a combined beam scanned to the screen on a light path between the horizontal scanning means and the screen.
Claim 13
Dependent Claim
20 words
The laser video projector of claim 1 , wherein the multi-screen projecting optical system comprises a plurality of reflecting mirrors.
Claim 14
Dependent Claim
51 words
The laser video projector of claim 1 , further comprising an optical system for making the laser beam of the white light emitted from the light source a parallel beam and controlling the thickness of the parallel beam on a light path between the light source and the light separating means.
Claim 15
Dependent Claim
39 words
The laser video projector of claim 13 , wherein the optical system comprises: a collimating lens for changing the laser beam of the white light into parallel beam; and telescopic lenses for controlling the thickness of the parallel beam.
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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) | 2004-01-09 | 2004-07-10 | 2005-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-09 | 2008-07-10 | 2009-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-09 | 2012-07-10 | 2013-01-09 | $7700.00 | Window Closed / Lapsed |