US3909102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color holography
Assignee: Hitachi Ltd
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Filing: 1974-01-10
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Granted: 1975-09-30
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Expires: 1994-01-10
Abstract
Abstract A hologram composing apparatus comprises a light source which generates an information light beam and a reference light beam coherent therewith and a predetermined recording medium on which there are recorded a plurality of holograms composed to divide incident light into a plurality of small beams and to impart irregular phase shifts to the respective small beams. A first lens arrangement causes the information light beam to impinge on the holograms and a second lens collimates the light diffracted from the holograms and introduces it into an information constructing component. A third lens converges the light emerging from the information constructing component at different positions on a hologram recording medium, and an optical element is provided to direct the reference light beam to the respective convergence points.
Inventors
- 👤 Yoshito Tsunoda
- 👤 Fumio Imagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:37
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/16; G02; G02B; G02B5/00; G02B5/32; G03H1/0486; G03H1/0476; G03H2001/0482; G03H1/26; G03H1/2645; G03H2001/266; G03H1/30; G03H2001/303; G03H2222/00; G03H2222/10; G03H2222/17; G03H2222/18; G03H2222/36; G03H2223/00; G03H2223/13
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
212 words
A color hologram comprising apparatus comprising: first means for generating an information coherent light beam and a reference coherent light beam each of said information and reference light beams being made up of respective red, green and blue light wavelength components; second means for directing said information light beam onto an illumination hologram medium composed of a plurality of illumination holograms disposed at a plurality of different positions thereon, said respective illumination holograms being holograms produced by red, green, and blue light wavelengths at said different positions on said illumination hologram medium corresponding to said red, green and blue light wavelengths and each of said illumination holograms respectively having the property of simultaneously dividing said light beam incident thereon into a plurality of discrete smaller diffracted rays, the phase shifts of which are irregularly distributed relative to one another; a recording medium disposed in The path of said information light beam; third means for directing the red, green and blue light rays diffracted by said illumination hologram onto an information storage element and for causing the red, green and blue light rays emanating therefrom to converge at respectively different positions on said recording medium; and fourth means for directing said reference light beam onto said respectively different positions on said recording medium.
Claim 2
Dependent Claim
212 words
A color hologram comprising apparatus comprising: first means for generating an information coherent light beam and a reference coherent light beam each of said information and reference light beams being made up of respective red, green and blue light wavelength components; second means for directing said information light beam onto an illumination hologram medium composed of a plurality of illumination holograms disposed at a plurality of different positions thereon, said respective illumination holograms being holograms produced by red, green, and blue light wavelengths at said different positions on said illumination hologram medium corresponding to said red, green and blue light wavelengths and each of said illumination holograms respectively having the property of simultaneously dividing said light beam incident thereon into a plurality of discrete smaller diffracted rays, the phase shifts of which are irregularly distributed relative to one another; a recording medium disposed in The path of said information light beam; third means for directing the red, green and blue light rays diffracted by said illumination hologram onto an information storage element and for causing the red, green and blue light rays emanating therefrom to converge at respectively different positions on said recording medium; and fourth means for directing said reference light beam onto said respectively different positions on said recording medium.
Claim 3
Dependent Claim
33 words
A hologram composing apparatus according to claim 1, wherein said third means comprises a collimating lens and a converging lens disposed optically in series between said illumination hologram medium and said recording medium.
Claim 4
Dependent Claim
23 words
A hologram composing apparatus according to claim 2, wherein said information storage element is disposed between said collimating lens and said converging lens.
Claim 5
Dependent Claim
23 words
A hologram composing apparatus according to claim 2, wherein said information storage element is disposed between said converging lens and said recording medium.
References Cited (Backward Citations)
US3746783A
Cited
US3744871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |