US3608994A
Expired / Lapsed
US
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Holographic information storage-and-retrieval system
Assignee: International Business Machines Corp
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Filing: 1969-04-28
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Granted: 1971-09-28
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Expires: 1989-04-28
Abstract
Abstract The invention concerns an information retrieval system in which a hologram is utilized as a mass-storage media that is scanned by means of a laser beam. The information which is retrieved is read out onto a photodiode array. Interposed between the hologram and the photodiode array is a key in the form of a spatial filter. When correlation is secured between the key and the information scanned in the hologram, an output beam is directed through the filter and onto the photodiode array. A second hologram is further interposed between the filter and the first hologram to provide for conversion to a single font when different fonts are employed in the first hologram.
Inventors
- 👤 James A Mcdonnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:29
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0065; G02; G02B; G02B27/00; G02B27/42; G02B27/46; G11C; G11C13/00; G11C13/04; G11C13/042; G11C15/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
A holographic system for storing and retrieving information, comprising: a first optical system including a coherent source for issuing a coherent light beam; a second optical system including a holoarray containing a plurality of holograms each storing different text portions of said information, a scanning laser for selectively scanning said holoarray and providing information beams containing images of said text portions of said information; a coupler forming a part of said first optical system for receiving and storing the images of said information beams; a lens forming part of said first optical system and disposed in the path of said coherent light beam for directing a collimated beam through the images stored in said coupler and providing a diffracted output beam; a filter containing a hologram of key information interposed in the path of said diffracted output beam to provide a modulated output beam; a transforming lens disposed in the path of said modulating output beam; and an image plane for receiving a point image of light from said modulated beam when correlation is secured between said key information and the image of a selected text of said information.
Claim 2
Dependent Claim
189 words
A holographic system for storing and retrieving information, comprising: a first optical system including a coherent source for issuing a coherent light beam; a second optical system including a holoarray containing a plurality of holograms each storing different text portions of said information, a scanning laser for selectively scanning said holoarray and providing information beams containing images of said text portions of said information; a coupler forming a part of said first optical system for receiving and storing the images of said information beams; a lens forming part of said first optical system and disposed in the path of said coherent light beam for directing a collimated beam through the images stored in said coupler and providing a diffracted output beam; a filter containing a hologram of key information interposed in the path of said diffracted output beam to provide a modulated output beam; a transforming lens disposed in the path of said modulating output beam; and an image plane for receiving a point image of light from said modulated beam when correlation is secured between said key information and the image of a selected text of said information.
Claim 3
Dependent Claim
51 words
A system as in claim 1 in which said information is constituted of different font characteristics, and further including a font hologram disposed in proximity to said filter to enable correlation between said key information and corresponding selected text information regardless of the font characteristics of said corresponding selected text information.
Claim 4
Dependent Claim
67 words
A system as in claim 1 in which said coherent source has a frequency of f2 for reading out the images stored in said coupler, said scan laser having a frequency f1, for storing said images in said coupler, said first optical system further including a mode filter capable of proViding selectively said frequency f2 and a frequency f3 for erasing the images stored in said coupler.
References Cited (Backward Citations)
US3408143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |