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US3880497A
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Method of storing optical information on a random carrier
Assignee: Xerox Corp
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Filing: 1973-11-08
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Granted: 1975-04-29
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Expires: 1993-11-08
Abstract
Abstract The present invention relates to the storage of optical information on a random or pseudo-random carrier. Such a carrier is comprised of a pseudo-random distribution of pulses, which distribution is modulated in accordance with the intensity distribution from an illuminated object. Provided that the spatial variation in the pulse parameters is at least on the order of the wavelength of light, a microstructure of the original object is formed which is coded with intensity information from the object. A recording of the microstructure may be made. By illuminating this recording with coherent light, the information stored thereon may be processed for reconstructing an image of the original object or extracting information from the recording.
Inventors
- 👤 Olof Bryngdahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:42
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/46; G03; G03B; G03B15/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
81 words
A method of storing optical information on a random carrier comprising the steps of: providing a carrier comprised of a pseudo-random distribution of pulses, the spatial variation in the pulse parameters being at least equal to the wavelength of light; modulating said distribution of pulses with optical information characterizing physical parameters of an illuminated object such that a microstructure is formed of a modified distribution of pulses with the optical information coded thereon; and recordinG the microstructure on a storage medium.
Claim 2
Independent Claim
81 words
A method of storing optical information on a random carrier comprising the steps of: providing a carrier comprised of a pseudo-random distribution of pulses, the spatial variation in the pulse parameters being at least equal to the wavelength of light; modulating said distribution of pulses with optical information characterizing physical parameters of an illuminated object such that a microstructure is formed of a modified distribution of pulses with the optical information coded thereon; and recordinG the microstructure on a storage medium.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein is further included the step of reconstructing said optical information from said microstructure.
Claim 4
Dependent Claim
34 words
The method of claim 1 wherein the storage medium is of an optically sensitive material which provides a carrier comprised of optical pulses in a pseudo-random distribution coded with optical information from the object.
Claim 5
Dependent Claim
28 words
The method of claim 3 wherein is further included the step of reconstructing an image of the object from the microstructure defined by said distribution of optical pulses.
Claim 6
Dependent Claim
30 words
The method of claim 4 wherein said reconstructing step includes the steps of illuminating said microstructure with spatially coherent light and imaging the resulting diffracted irradiance onto an image plane.
Claim 7
Dependent Claim
23 words
The method of claim 5 wherein is further included the step of spatially filtering said irradiance between said microstructure and said image plane.
Claim 8
Dependent Claim
26 words
The method of claim 6 wherein said distribution of pulses is randomized such that a microtexture is provided in the image formed in said image plane.
Claim 9
Dependent Claim
31 words
The method of claim 7 wherein said irradiance is imaged by a telecentric lens system whereby a double Fourier transform of the diffracted irradiance reconstructs the image in said image plane.
Claim 10
Dependent Claim
23 words
The method of claim 3 wherein the storage medium is a photographic emulsion which provides a carrier comprised of a distribution of grains.
Claim 11
Dependent Claim
23 words
The method of claim 3 wherein the storage medium is of deformagraphic material which provides a carrier comprised of a distribution of wrinkles.
Claim 12
Dependent Claim
24 words
The method of claim 1 wherein the number of pulses in said distribution is modulated in accordance with the intensity of said optical information.
Claim 13
Dependent Claim
24 words
The method of claim 1 wherein the width of pulses in said distribution is modulated in accordance with the intensity of said optical information.
Claim 14
Dependent Claim
26 words
The method of claim 1 wherein the number and width of pulses in said distribution is modulated in accordance with the intensity of said optical information.
Claim 15
Dependent Claim
48 words
The method of claim 11 wherein said distribution is a distribution of optical pulses coded with optical information and wherein is further included the step of reconstructing said optical information from said distribution whereby a randomness of reconstructed light in regard to both density and intensity is achieved.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |