US4337992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hologram movie projection apparatus
Assignee: Individual
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Filing: 1980-04-16
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Granted: 1982-07-06
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Expires: 2000-04-16
Abstract
Abstract A shutterless hologram movie apparatus using an incoherent (non-laser) light source in the viewing apparatus. Image immobilization and dispersion compensation are both accomplished with the same reference beam-forming optics. The hologram film is imaged onto the exit pupil by means of a converging lens or mirror in the vicinity of the image. As the hologram film is drawn vertically across the reference beam, horizontal time frame bands on the film scan the exit pupil, resulting in apparent motion of the image.
Inventors
- 👤 Kenneth C. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:32
CPC Classifications
G; G03; G03H; G03H1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
299 words
A means of generating three dimensional moving imagery comprising: a hologram medium comprising elemental time frame holograms recorded on a hologram film or films as narrow juxtaposed bands oriented transversely to the long dimension of said hologram film(s), appropriate mechanism whereby said hologram film(s) is (are) drawn across a stationary reference beam or beams, the direction of said drawing to be parallel to the long dimension of said hologram film(s), and whereby moving imagery visible from within a system exit pupil is generated, first focusing means whereby the portion of said hologram film(s) illuminated by said reference beam(s) is substantially imaged onto said exit pupil, the long dimension of said hologram film(s) being imaged transversely to the normal eye plane, diffraction means comprising a diffraction grating or gratings, whereby said reference beam(s) is (are) generated by diffraction from a source beam or beams, zero order stop means, preferably a louvered filter or filters interposed between said diffraction grating(s) and said hologram film(s), whereby the portion of said source beam(s) not diffracted by said diffraction grating(s) is blocked from entering said exit pupil, a small light source or sources from which said source beam(s) originate(s), second focusing means interposed either between said light source(s) and said diffraction grating(s), or between said diffraction grating(s) and said hologram film(s), or between said hologram film(s) and said first focusing means, or a combination thereof, wherein said second focusing means without said diffraction means and said hologram medium present would image said light source substantially to a point central to the image, thereby eliminating chromatic dispersion at said point, and thereby causing imagery generated from any said time frame hologram and focused in a designated image plane containing said point to appear motionless as said time frame hologram is drawn across said reference beam.
Claim 2
Dependent Claim
299 words
A means of generating three dimensional moving imagery comprising: a hologram medium comprising elemental time frame holograms recorded on a hologram film or films as narrow juxtaposed bands oriented transversely to the long dimension of said hologram film(s), appropriate mechanism whereby said hologram film(s) is (are) drawn across a stationary reference beam or beams, the direction of said drawing to be parallel to the long dimension of said hologram film(s), and whereby moving imagery visible from within a system exit pupil is generated, first focusing means whereby the portion of said hologram film(s) illuminated by said reference beam(s) is substantially imaged onto said exit pupil, the long dimension of said hologram film(s) being imaged transversely to the normal eye plane, diffraction means comprising a diffraction grating or gratings, whereby said reference beam(s) is (are) generated by diffraction from a source beam or beams, zero order stop means, preferably a louvered filter or filters interposed between said diffraction grating(s) and said hologram film(s), whereby the portion of said source beam(s) not diffracted by said diffraction grating(s) is blocked from entering said exit pupil, a small light source or sources from which said source beam(s) originate(s), second focusing means interposed either between said light source(s) and said diffraction grating(s), or between said diffraction grating(s) and said hologram film(s), or between said hologram film(s) and said first focusing means, or a combination thereof, wherein said second focusing means without said diffraction means and said hologram medium present would image said light source substantially to a point central to the image, thereby eliminating chromatic dispersion at said point, and thereby causing imagery generated from any said time frame hologram and focused in a designated image plane containing said point to appear motionless as said time frame hologram is drawn across said reference beam.
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) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |