US4135251A
Expired / Lapsed
US
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Method for coded sequential non-coherent, redundant optical data-storage
Assignee: Siemens AG
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Filing: 1973-03-12
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Granted: 1979-01-16
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Expires: 1993-03-12
Abstract
Abstract A method for coded, sequential, non-coherent, redundant, optical data storage wherein a number of one-dimensional holograms is recorded in a timed succession upon a light-sensitive tape through the utilization of a pulse amplitude-modulated light beam and a correction light beam of the light-sensitive tape is separately effected from the signal beam with respect to space and time in such a way that the entire exposure resulting from the signal exposure beam and the correction exposure beam is constant during each recordation, and wherein either the pulse amplitude- modulated light beam or the correction exposure beam are modulated with a noise intensity with respect to time in such a way that the contrast of the individual recorded holograms varies statistically.
Inventors
- 👤 Hartwig Ruell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:57
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/20; G03H1/202; G03H1/06; G03H1/18; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G03H1/0486
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A method for coded, sequential, non-coherent, redundant, optical data storage, comprising the steps of: sequentially recording in a timed sequence a number of one-dimensional holograms upon a light-sensitive tape with a pulse amplitude-modulated light beam; applying a correction exposure of the light-sensitive tape with a correction beam separate from the signal exposure with respect to space and time to provide an entire exposure which is constant during each recording; and modulating one of the beams with a noise signal with respect to time to provide a contrast of the individual recorded holograms which statistically varies.
Claim 2
Independent Claim
95 words
A method for coded, sequential, non-coherent, redundant, optical data storage, comprising the steps of: sequentially recording in a timed sequence a number of one-dimensional holograms upon a light-sensitive tape with a pulse amplitude-modulated light beam; applying a correction exposure of the light-sensitive tape with a correction beam separate from the signal exposure with respect to space and time to provide an entire exposure which is constant during each recording; and modulating one of the beams with a noise signal with respect to time to provide a contrast of the individual recorded holograms which statistically varies.
Claim 3
Dependent Claim
46 words
A method according to claim 1, wherein the step of modulating one of the beams is further defined as modulating with a noise signal having a spectrum which provides that the entire exposures are positioned within the linear range of the characteristic of the light-sensitive tape.
Claim 4
Dependent Claim
22 words
A method according to claim 1, comprising the step of simultaneously recording the noise signal upon a second light-sensitive tape for retrieval.
Claim 5
Dependent Claim
22 words
A method according to claim 3, comprising the step of recording synchronization marks at equal instance upon both of the light-sensitive tapes.
Claim 6
Dependent Claim
38 words
A method according to claim 3, comprising the steps of permeating both of the tapes with a reconstruction light beam; demodulating each light beam with respect to intensity; and mixing the demodulation products to retrieve the decoded information.
References Cited (Backward Citations)
US3764979A
Cited
US3778128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |