US3692380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing holograms utilizing a plurality of short focus convex lenses
Assignee: Fujitsu Ltd
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Filing: 1971-02-01
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Granted: 1972-09-19
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Expires: 1991-02-01
Abstract
Abstract A plurality of short focus convex lenses are irradiated with a coherent beam of light. The coherent beam of light is diffused by the lenses and the diffused light is directed to a storage plate. The storage plate is irradiated with a reference beam of light in a manner whereby the reference beam of light interferes with the diffused beam of light.
Inventors
- 👤 Takefumi Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:39
CPC Classifications
G; G03; G03H; G03H1/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A method of producing holograms, comprising the steps of irradiating a coherent beam of light onto a plurality of short focus convex lenses constituting an image information; diffusing the coherent beam of light by the convex lenses; directing the diffused light to a storage plate located a considerable distance further away from the convex lenses than the foci of the convex lenses so that the diffused light from all the convex lenses irradiates the storage plate; and irradiating the storage plate with a reference beam of light so as to cause the reference beam to interfere with the diffused beam of light.
Claim 2
Independent Claim
102 words
A method of producing holograms, comprising the steps of irradiating a coherent beam of light onto a plurality of short focus convex lenses constituting an image information; diffusing the coherent beam of light by the convex lenses; directing the diffused light to a storage plate located a considerable distance further away from the convex lenses than the foci of the convex lenses so that the diffused light from all the convex lenses irradiates the storage plate; and irradiating the storage plate with a reference beam of light so as to cause the reference beam to interfere with the diffused beam of light.
Claim 3
Dependent Claim
31 words
A method of producing holograms as claimed in claim 1, wherein the image information is constituted by the intensity ratio of the coherent beams of light passing through the convex lenses.
Claim 4
Dependent Claim
26 words
A method of producing holograms as claimed in claim 1, which comprises varying the image information by controlling the magnitude of light irradiating the convex lenses.
Claim 5
Dependent Claim
121 words
Apparatus for producing holograms, comprising light means for providing a coherent body beam of light and a reference beam of light; an information source comprising a plurality of coplanarly positioned short convex lenses for diffusing the coherent beam of light; a plurality of light switches in front of the convex lenses for controlling the coherent beam of light irradiating the convex lenses; control means for controlling the operation of the light switches to constitute the image information; and a storage plate behind the information source at a position in which it receives the diffused light from all the convex lenses, said storage plate being located a considerable distance further away from the convex lenses than the foci of the convex lenses.
Claim 6
Dependent Claim
121 words
Apparatus for producing holograms, comprising light means for providing a coherent body beam of light and a reference beam of light; an information source comprising a plurality of coplanarly positioned short convex lenses for diffusing the coherent beam of light; a plurality of light switches in front of the convex lenses for controlling the coherent beam of light irradiating the convex lenses; control means for controlling the operation of the light switches to constitute the image information; and a storage plate behind the information source at a position in which it receives the diffused light from all the convex lenses, said storage plate being located a considerable distance further away from the convex lenses than the foci of the convex lenses.
Claim 7
Dependent Claim
18 words
Apparatus for producing holograms as claimed in claim 4, wherein the storage plate comprises a photographic dry plate.
Claim 8
Dependent Claim
30 words
Apparatus for producing holograms as claimed in claim 4, wherein the storage plate comprises a storage medium on which holograms may be produced and from which holograms may be erased.
Claim 9
Dependent Claim
36 words
Apparatus for producing holograms as claimed in claim 4, wherein the light means comprises a laser source for providing a polarized coherent beam of light, and a polarizing plate positioned in front of the convex lenses.
References Cited (Backward Citations)
US3515452A
Cited
US3572878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |