US3782804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holography using multiple diffused object illumination beams
Assignee: Hitachi Ltd
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Filing: 1972-10-18
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Granted: 1974-01-01
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Expires: 1992-10-18
Abstract
Abstract A hologram recording apparatus comprises a diffraction grating which serves to convert an object light beam obtained from a single light source into a plurality of beams, and a diffuser which is arranged in the path of the multiple light, whereby an object is illuminated by light from said diffuser.
Inventors
- 👤 Y Kanazawa
- 👤 Y Eto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:15
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
An apparatus for making Fourier transform holograms comprising: first means for providing first and second beams of coherent energy; second means, disposed in the path of said first beam of energy, for converting said first beam into a plurality of diffracted energy beams and for spatially separating each of said plurality of diffracted beams from the other of said plurality of diffracted beams; third means, disposed in the path of said diffracted energy beams at a location where said beams are spatially separated, for scattering said diffracted energy beams; fourth means, disposed in the path of said scattered energy beams, for collimating said scattered energy beams and directing said collimated scattered beams upon an object; and fifth means, disposed in the path of said second energy beam and the beams directed toward said object, for forming a hologram of said object with a substantially increased signal-to-noise ratio.
Claim 2
Independent Claim
147 words
An apparatus for making Fourier transform holograms comprising: first means for providing first and second beams of coherent energy; second means, disposed in the path of said first beam of energy, for converting said first beam into a plurality of diffracted energy beams and for spatially separating each of said plurality of diffracted beams from the other of said plurality of diffracted beams; third means, disposed in the path of said diffracted energy beams at a location where said beams are spatially separated, for scattering said diffracted energy beams; fourth means, disposed in the path of said scattered energy beams, for collimating said scattered energy beams and directing said collimated scattered beams upon an object; and fifth means, disposed in the path of said second energy beam and the beams directed toward said object, for forming a hologram of said object with a substantially increased signal-to-noise ratio.
Claim 3
Dependent Claim
63 words
An apparatus according to claim 1, wherein said energy is light, said second means comprises a transparent diffraction grating and a first lens displaced with respect to said grating to receive said plurality of said diffracted energy beams, and wherein said fourth means comprises a first collimating lens, a focal point of which is coincident with a focal point of said first lens.
Claim 4
Dependent Claim
32 words
An apparatus according to claim 2, wherein said third means comprises a diffuser disposed between said first lens and said first collimating lens displaced with respect to the coincident focal points thereof.
Claim 5
Dependent Claim
50 words
An apparatus according to claim 3, wherein said second means comprises a first beam expander and a second collimating lens for directing an expanded collimated beam onto said diffraction grating, and further including a second beam expander and a third collimating lens disposed in the path of said second beam.
Claim 6
Dependent Claim
29 words
An apparatus according to claim 2, wherein said third means comprises a diffuser disposed between said first lens and said first collimating lens at the coincident focal points thereof.
Claim 7
Dependent Claim
50 words
An apparatus according to claim 5, wherein said second means comprises a first beam expander and a second collimating lens for directing an expanded collimaTed beam onto said diffraction grating, and further including a second beam expander and a third collimating lens disposed in the path of said second 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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |