US3737878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic read/write storage system
Assignee: International Business Machines Corp
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Filing: 1971-03-22
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Granted: 1973-06-05
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Expires: 1991-03-22
Abstract
Abstract The invention relates to a holographic mass data storage system in which coded representations of data are recorded on the photosensitive surface of a drum sequentially under control of mechanical means, and means for reading the written information, by reflection onto an array of radially disposed photodetectors. An address control means is provided whereby the written information may be selectively read out in any desired combinations of words of information.
Inventors
- 👤 R Gamblin
- 👤 C Southard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/002; G11B7/0025; G11C; G11C13/00; G11C13/04; G11C13/042; G03; G03H; G03H2270/00; G03H2270/20; G03H2270/21
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A hologram read out system for reading out recorded information holographically stored on the surface of a drum comprising: means for rotating said drum; a plurality of light sources; a plurality of photodiode matrices each containing an array of photodiodes; said light sources and matrices being alternately arranged in radial relationship to said surface; means for activating said light sources to direct light beams upon the drum recorded information, each of the latter issuing a reflected light pattern depending upon the nature of the recorded information, that is directed upon an appropriate array of photodiodes, and read out buffers interconnected to said diode matrices for storing electrical representations of the stored information.
Claim 2
Dependent Claim
112 words
A hologram read out system for reading out recorded information holographically stored on the surface of a drum comprising: means for rotating said drum; a plurality of light sources; a plurality of photodiode matrices each containing an array of photodiodes; said light sources and matrices being alternately arranged in radial relationship to said surface; means for activating said light sources to direct light beams upon the drum recorded information, each of the latter issuing a reflected light pattern depending upon the nature of the recorded information, that is directed upon an appropriate array of photodiodes, and read out buffers interconnected to said diode matrices for storing electrical representations of the stored information.
Claim 3
Dependent Claim
34 words
The system as in claim 1 in which the spatial orientation of said sources and matrices is such as to provide maximum intensities in the reflected light during the issuance of said gating pulses.
Claim 4
Dependent Claim
52 words
A system as in claim 1 further including a timing track on said drum; optical means associated therewith for reading out light pulses, and a gating control means responsive to said pulses for issuing timed electrical gating signals to said read out buffers for reading therein electrical representations of the stored information.
Claim 5
Dependent Claim
29 words
A system as in claim 3 in which said means for activating said light sources comprises a sequence control means for controlling different sequences of activation of said sources.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |