US3740469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflective panoramic t.v. projection system
Assignee: United States Department of the Navy
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Filing: 1972-04-19
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Granted: 1973-06-19
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Expires: 1992-04-19
Abstract
Abstract A 360* panoramic television display system employs a plurality of television projection tubes operating in a single-line-scan mode and located in fixed positions around the vertical axis of the display system. The projected single-line-scans from the tubes are mediated by a reflective assembly contoured and faceted such that, when rotated, the single-line-scans, oriented vertically, are caused to move on the display screen in the horizontal direction at the television field rate, thus generating a television raster through 360*.
Inventors
- 👤 J Herndon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:06
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7425; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/3147
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A 360* panoramic television projection system comprising: a 360* projection screen extending about a vertical central axis; a plurality of television projection means, n in number, for generating in synchronism a like number of single line, vertical scanning beams; a reflection element having n contoured facets and mounted within said screen for rotation about said axis; support means for supporting said projection means in equally spaced locations about said axis and aimed inwardly at said reflection element; and drive means for rotating said reflection element whereby with each 1/n revolution of said element each facet thereof causes one of said beams to sweep 1/n of the azimuth of said screen.
Claim 2
Dependent Claim
110 words
A 360* panoramic television projection system comprising: a 360* projection screen extending about a vertical central axis; a plurality of television projection means, n in number, for generating in synchronism a like number of single line, vertical scanning beams; a reflection element having n contoured facets and mounted within said screen for rotation about said axis; support means for supporting said projection means in equally spaced locations about said axis and aimed inwardly at said reflection element; and drive means for rotating said reflection element whereby with each 1/n revolution of said element each facet thereof causes one of said beams to sweep 1/n of the azimuth of said screen.
Claim 3
Dependent Claim
51 words
A projection system as defined in claim 1, and wherein: said 360* projection screen is spherically curved; and said projection means and said reflection element facets are so located that for any rotative position of said reflection element, the light paths from said projection means to said screen are substantially equal.
Claim 4
Dependent Claim
32 words
A projection system as defined in claim 2, and wherein: x and y coordinates of points on said contoured facets are defined by the following equations: x h - (k-y/tan Psi )
Claim 5
Dependent Claim
53 words
A projection system as defined in claim 3, and wherein: said projection means are operative to modulate the intensity of said beams in response to video signals derived from a television camera system comprising n single, vertical line scanning cameras viewing a panoramic scene through a rotatable reflection element having n contoured facets.
Claim 6
Dependent Claim
52 words
A projection system as defined in claim 4, and wherein: said projection means produce said vertical scan lines at a rate determined by sync signals derived from said camera system; and said drive means for said reflection element of said projection system is responsive to sync signals derived from said camera system.
Claim 7
Dependent Claim
62 words
A projection system as defined in claim 5, and wherein: said projection means are each operable in synchronism to provide a predetermined number of vertical single line scans for each 1n revolution of said reflection element, said predetermined number being characterized as ending, with a fraction, whereby a raster is formed on said screen consisting of successive, interlaced fields of vertical lines.
Claim 8
Dependent Claim
74 words
A projection system as defined in claim 5, and wherein: said reflective element rotates a plurality of revolutions during the time required for one of said vertical line scans; and said projection means are each operable in synchronism to provide additional vertical line scans starting a fraction of a raster line time behind the previously mentioned vertical line scans, whereby a 360* interlace raster of generally horizontal, spiral lines is generated on said screen.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |