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US4533211A
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Frequency multiplexed optical spatial filter based upon photochemical hole burning
Assignee: International Business Machines Corp
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Filing: 1983-01-31
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Granted: 1985-08-06
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Expires: 2003-01-31
Abstract
Abstract A frequency multiplexed optical spatial filter is based upon a thin film of a photochemical hole burning material. The filter stores a plurality of images in the photochemical hole burning medium. The images are formed at different optical frequencies and coexist in the same volume of the storage medium. Individual images are accessed by changing the frequency of the illuminating radiation.
Inventors
- 👤 Gary C. Bjorklund
- 👤 Glenn T. Sincerbox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:50
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/46; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
35 words
A frequency multiplexed optical spatial filter comprising: a plurality of images stored in a photochemical hole burning storage medium, said images formed at different optical frequencies and co-existing in the same volume of said medium.
Claim 2
Dependent Claim
35 words
A frequency multiplexed optical spatial filter comprising: a plurality of images stored in a photochemical hole burning storage medium, said images formed at different optical frequencies and co-existing in the same volume of said medium.
Claim 3
Dependent Claim
20 words
An optical spatial filter as described in claim 1 wherein said storage material is an alkali halide containing color centers.
Claim 4
Dependent Claim
18 words
An optical spatial filter as described in claim 1 wherein said storage material is LiF containing color centers.
Claim 5
Dependent Claim
18 words
An optical spatial filter as described in claim 1 wherein said storage material is NaCl containing color centers.
Claim 6
Dependent Claim
72 words
A pattern recognition system comprising: a frequency multiplexed optical spatial filter including a plurality of images stored in a photochemical hole burning storage medium, said images formed at different optical frequencies and coexisting in the same volume of said medium, means for illuminating said medium with a first optical frequency with an unknown image, and means for comparing said unknown image with said plurality of images by altering said first optical wavelength.
Claim 7
Dependent Claim
72 words
A pattern recognition system comprising: a frequency multiplexed optical spatial filter including a plurality of images stored in a photochemical hole burning storage medium, said images formed at different optical frequencies and coexisting in the same volume of said medium, means for illuminating said medium with a first optical frequency with an unknown image, and means for comparing said unknown image with said plurality of images by altering said first optical wavelength.
Claim 8
Dependent Claim
16 words
A pattern recognition system as described in claim 5 wherein said illuminating means is a laser.
Claim 9
Dependent Claim
17 words
A pattern recognition system as described in claim 5 wherein said illuminating means is a GaAlAs laser.
Claim 10
Dependent Claim
16 words
A pattern recognition system as described in claim 5 wherein said comparing means is a photodetector.
Claim 11
Independent Claim
67 words
A method of pattern recognition comprising the steps of storing a plurality of known images in a photochemical hole burning storage medium, said images formed at different optical frequencies and co-existing in the same volume of said medium, illuminating said storage medium with a first optical frequency with an unknown image, and comparing said unknown image with said plurality of images by altering said first optical frequency.
Claim 12
Independent Claim
67 words
A method of pattern recognition comprising the steps of storing a plurality of known images in a photochemical hole burning storage medium, said images formed at different optical frequencies and co-existing in the same volume of said medium, illuminating said storage medium with a first optical frequency with an unknown image, and comparing said unknown image with said plurality of images by altering said first optical frequency.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |