US3600510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Close viewing tv for simulators
Assignee: United States Department of the Navy
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Filing: 1969-07-01
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Granted: 1971-08-17
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Expires: 1989-07-01
Abstract
Abstract The number of lines in a television raster is increased to remove a raster visible on a television tube screen at close viewing distances without a concomitant increase in complexity of apparatus. One gun of a two-gun cathode-ray display tube receives a video signal. The second gun receives the video signal delayed. The scanning lines generated by the two guns on the display screen are controlled by sweep voltages in such manner that the lines are interleaved and the horizontal sweep of one beam is delayed an amount proportional to the video delay.
Inventors
- 👤 Joseph R Owen
- 👤 John J Kulik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:15
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
259 words
In a television system, the improvement comprising: a television camera for developing a video signal, a cathode-ray tube, said cathode-ray tube having a screen and two electron beam guns located therein, each of said electron beam guns being adapted to be controlled to trace a respeCtive separate and distinct raster on said screen, said rasters each being comprised of a plurality of horizontal scanning lines, the horizontal scanning lines generated by one gun being interlaced with the horizontal scanning lines generated by the other gun, the scanning arrangement being such that the separate and distinct rasters are not superimposed, the scanning spot generated by one beam being horizontally displaced with respect to the scanning spot generated by the other beam a distance sufficient to avoid interference, a first line connecting the video output terminal of said camera to a first of said electron beam guns whereby the signal level of the beam developed by said first gun is controlled by the video signal developed by said camera, a second line connecting the video output terminal of said camera to said second electron beam gun whereby the signal level of the electron beam developed by said second electron gun is controlled by the video signal developed by said camera, and delay means connected in said second line between said camera and said second electron beam gun to delay said video signal for a time proportional to the horizontal displacement of the scanning spots generated by said electron beams, whereby the scanning raster visible under adverse conditions is caused to disappear.
Claim 2
Dependent Claim
259 words
In a television system, the improvement comprising: a television camera for developing a video signal, a cathode-ray tube, said cathode-ray tube having a screen and two electron beam guns located therein, each of said electron beam guns being adapted to be controlled to trace a respeCtive separate and distinct raster on said screen, said rasters each being comprised of a plurality of horizontal scanning lines, the horizontal scanning lines generated by one gun being interlaced with the horizontal scanning lines generated by the other gun, the scanning arrangement being such that the separate and distinct rasters are not superimposed, the scanning spot generated by one beam being horizontally displaced with respect to the scanning spot generated by the other beam a distance sufficient to avoid interference, a first line connecting the video output terminal of said camera to a first of said electron beam guns whereby the signal level of the beam developed by said first gun is controlled by the video signal developed by said camera, a second line connecting the video output terminal of said camera to said second electron beam gun whereby the signal level of the electron beam developed by said second electron gun is controlled by the video signal developed by said camera, and delay means connected in said second line between said camera and said second electron beam gun to delay said video signal for a time proportional to the horizontal displacement of the scanning spots generated by said electron beams, whereby the scanning raster visible under adverse conditions is caused to disappear.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |