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Patent US3628847A successfully refreshed from Google Patents.
US3628847A
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US
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Hologram memory
Assignee: RCA Corp
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Filing: 1969-09-05
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Granted: 1971-12-21
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Expires: 1989-09-05
Abstract
Abstract An array of holograms, each representing many light sources, is employed during the write operation. When one of these holograms is illuminated by a laser beam, the reconstructed light sources of that hologram illuminate a corresponding number of memory locations of a ''''page'''' of data. The light from the page then is focused onto a small area of a recording medium. A reference beam from the same laser concurrently is directed at this same small area to cause to be ''''written'''' there a hologram of the page.
Inventors
- 👤 David Ira Bostwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:09
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/04; G11C13/042; H; H04; H04N; H04N5/00; H04N5/76; H04N5/89
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
In combination: a page of data comprising an array of memory locations, each location optically representing the value of the binary digit stored at that location; an array of holograms, each of a plurality of coherent light sources equal in number to the memory locations on said page and located in a position corresponding to that of a memory location; a recording medium; a source of coherent light; means for deriving from said source a reference beam and directing it at one of a plurality of locations on said recording medium; means for deriving from said source an object beam and directing said object beam at a hologram of said array for reconstructing the image of the light sources stored there over the corresponding memory locations on said page; and means for focusing the light reaching said page onto the same location on said recording medium as said reference beam.
Claim 2
Dependent Claim
150 words
In combination: a page of data comprising an array of memory locations, each location optically representing the value of the binary digit stored at that location; an array of holograms, each of a plurality of coherent light sources equal in number to the memory locations on said page and located in a position corresponding to that of a memory location; a recording medium; a source of coherent light; means for deriving from said source a reference beam and directing it at one of a plurality of locations on said recording medium; means for deriving from said source an object beam and directing said object beam at a hologram of said array for reconstructing the image of the light sources stored there over the corresponding memory locations on said page; and means for focusing the light reaching said page onto the same location on said recording medium as said reference beam.
Claim 3
Dependent Claim
23 words
In the combination as set forth in claim 1, said page of data comprising a member formed with light-passing and light-blocking memory locations.
Claim 4
Dependent Claim
40 words
In the combination as set forth in claim 1, said page of data comprising a sheet Formed with opaque locations to represent storage of bits of one value and transparent locations to represent storage of bits of the other value.
Claim 5
Dependent Claim
30 words
In the combination as set forth in claim 1, said page of data comprising a sheet formed with dark and light regions to represent storage of bits of different value.
References Cited (Backward Citations)
US3529887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |