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Patent US4283777A successfully refreshed from Google Patents.
US4283777A
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Optical memory having a parallel read out
Assignee: Xerox Corp
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Filing: 1979-05-14
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Granted: 1981-08-11
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Expires: 1999-05-14
Abstract
Abstract The output beam of a read laser for an optical memory is diffracted to provide a plurality of read beams of substantially equal intensity for simultaneously scanning all of the data tracks of a selected data channel with a different one of the read beams, whereby each of the read beams is optically modulated in accordance with the data recorded on a respective one of the data tracks. The optically modulated read beams are applied to respective detectors, whereby the data recorded on the different data tracks is simultaneously converted into corresponding video electrical signals. Those signals are, in turn, output selectively or in parallel.
Inventors
- 👤 Donald J. Curry
- 👤 Gordon R. Knight
- 👤 Daniel C. Kowalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:11
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0901; G11B7/004; G11B7/005; G11B7/0938; G11B7/12; G11B7/125; G11B7/128; G11B7/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
In an optical memory having a recording medium with at least one band of tracks including a plurality of data tracks, a head containing a laser for supplying a beam of coherent radiation, and a plurality of detectors for generating individual video signals in response to radiation propogated from respective ones of said data tracks; the improvement comprising a diffraction grating disposed between said laser and said recording medium for dividing said beam into a plurality of discrete read beams of substantially equal intensity, and means disposed between said diffraction grating and said recording medium for simultaneously focusing said read beams onto respective ones of said data tracks, whereby said data tracks are read out in parallel.
Claim 2
Dependent Claim
117 words
In an optical memory having a recording medium with at least one band of tracks including a plurality of data tracks, a head containing a laser for supplying a beam of coherent radiation, and a plurality of detectors for generating individual video signals in response to radiation propogated from respective ones of said data tracks; the improvement comprising a diffraction grating disposed between said laser and said recording medium for dividing said beam into a plurality of discrete read beams of substantially equal intensity, and means disposed between said diffraction grating and said recording medium for simultaneously focusing said read beams onto respective ones of said data tracks, whereby said data tracks are read out in parallel.
Claim 3
Dependent Claim
33 words
The improvement of claim 1 wherein said recording medium is a disk, and said read beams are substantially in radial alignment with respect to said disk while being focused onto said data tracks.
Claim 4
Dependent Claim
24 words
The improvement of claim 2 wherein said optical memory is a digital optical disk memory, and said disk is removably mounted on said drive.
Claim 5
Dependent Claim
51 words
The improvement of claim 3 wherein said disk memory is a direct read after write optical memory said disk comprises an ablatable reflective film coated on an optically transparent substrate, and said film has a predetermined ablation threshold selected to prevent any significant ablation of said film by said read beams.
Claim 6
Dependent Claim
71 words
The improvement of claim 1 wherein said recording medium has a plurality of data channels each of which contains a band of tracks including a servo track and a plurality of data tracks; and further including means for referencing said head to the servo track of a selected one of said channels, whereby said read beams are focused on at least certain ones of the data tracks of said selected channel.
Claim 7
Dependent Claim
18 words
The improvement of claim 5 wherein said recording medium is a disk, and said data channels are concentric.
Claim 8
Dependent Claim
26 words
The improvement of claim 6 wherein said memory is a direct read after write optical disk memory, and said disk is removably mounted on said memory.
Claim 9
Dependent Claim
40 words
The improvement of claim 7 wherein said disk comprises an ablatable reflective film coated on an optically transparent substrate, and said film has a predetermined ablation threshold selected to prevent any significant ablation of said film by said read beams.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |