Patent FR2554563A1 successfully refreshed from Google Patents.
US4065202A
Expired / Lapsed
US
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Projection system for display of parallax and perspective
Assignee: National Aeronautics and Space Administration
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Filing: 1975-11-06
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Granted: 1977-12-27
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Expires: 1995-11-06
Abstract
Abstract A projection system for the display of parallax and perspective of a real image from a hologram in which a reference beam is projected in a sequence of several projections at selected angles of perspective through the hologram, this sequence being rapidly performed. The resulting angular spaced images emitting from the hologram are directed onto a mirror which is coordinately tilted to reflect all of the resulting images in register onto a screen where they appear as a single three-dimensional image.
Inventors
- 👤 Robert L. Kurtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:58
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A three-dimensional holographic projection system comprising: positioning means for positioning a holographic transparency in a position where light may be transmitted through it; light source means for projecting a beam of monochromatic light along a movable path through a hologram positioned by said positioning means; scanning and blanking means coupled to said light source means for causing said beam to be selectively and sequentially displaced to selectively strike said hologram at a plurality of selected perspective angles and said light to be blanked except when striking said hologram at said selected perspective angles; a viewing screen; and mirror means responsive to resulting displaced beams omitted from the holographic transparency for reflecting said beam in register on said screen.
Claim 2
Dependent Claim
118 words
A three-dimensional holographic projection system comprising: positioning means for positioning a holographic transparency in a position where light may be transmitted through it; light source means for projecting a beam of monochromatic light along a movable path through a hologram positioned by said positioning means; scanning and blanking means coupled to said light source means for causing said beam to be selectively and sequentially displaced to selectively strike said hologram at a plurality of selected perspective angles and said light to be blanked except when striking said hologram at said selected perspective angles; a viewing screen; and mirror means responsive to resulting displaced beams omitted from the holographic transparency for reflecting said beam in register on said screen.
Claim 3
Dependent Claim
13 words
A system as set forth in claim 1 wherein said screen is translucent.
Claim 4
Dependent Claim
27 words
A system as set forth in claim 1 wherein said mirror means includes a plane mirror and means for synchronously, with said scanning means, tilting said mirror.
Claim 5
Dependent Claim
16 words
A system as set forth in claim 1 wherein said mirror means comprises a curved mirror.
Claim 6
Dependent Claim
32 words
A system as set forth in claim 1 wherein said scanning means includes means for scanning selected regions of a said hologram linearly along at least one line at discrete selected angles.
Claim 7
Dependent Claim
45 words
A system as set forth in claim 5 wherein: said scanning means comprises means for causing said beam to scan to horizontal and vertical positions, and said mirror means includes means for synchronously, with said scanning means, tilting said mirror means about two normal axes.
References Cited (Backward Citations)
US3632181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |