US4539591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of impressing and reading out a surface charge on a multi-layered detector structure
Assignee: Quantum Imaging Corp
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Filing: 1979-05-14
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Granted: 1985-09-03
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Expires: 1999-05-14
Abstract
Abstract A method of recording and reading out a latent image which comprises placing a uniform surface charge on the photoconductive layer of a multilayered detector apparatus, biasing said photoconductive layer with an electric field whose polarity opposes said surface charge, discharging some portion of said surface charge of said photoconductive layer by exposing said detector to a modulated radiation flux capable of generating electron hole pairs in the photoconductor; scanning the surface of said partially discharged photoconductive layer with a small diameter photon beam whereby said surface charge is sequentially further discharged, and measuring the changing electric current of said sequential further discharge as a function of time.
Inventors
- 👤 Alfonso Zermeno
- 👤 Lee M. Marsh, Jr.
- 👤 Ronald W. Cowart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:03
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/26; G03; G03G; G03G15/00; G03G15/054; G03G15/22; G03G15/221; G03G15/222; G21; G21K; G21K4/00; H; H04; H04N; H04N23/00; H04N23/30; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/38; H05G1/42; H05G1/64; H10; H10F; H10F99/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A method of recording and reading out a latent image comprising: placing a surface charge on the photoconductive layer of a multilayered detector apparatus; causing said surface charge to be distributed uniformly on said photoconductive layer; biasing said photoconductive layer with an electronic field whose polarity opposes said surface charge; discharing some portion of said surface charge of said photoconductive layer by exposing said detector to a modulated radiation flux capable of generating electron hole pairs in the photoconductor; scanning the surface of said partially discharged photoconductive layer with a small diameter photon beam whereby surface charge is sequentially further discharged; and measuring the changing electric potential of said sequential further discharge as a function of time.
Claim 2
Independent Claim
117 words
A method of recording and reading out a latent image comprising: placing a surface charge on the photoconductive layer of a multilayered detector apparatus; causing said surface charge to be distributed uniformly on said photoconductive layer; biasing said photoconductive layer with an electronic field whose polarity opposes said surface charge; discharing some portion of said surface charge of said photoconductive layer by exposing said detector to a modulated radiation flux capable of generating electron hole pairs in the photoconductor; scanning the surface of said partially discharged photoconductive layer with a small diameter photon beam whereby surface charge is sequentially further discharged; and measuring the changing electric potential of said sequential further discharge as a function of time.
Claim 3
Dependent Claim
24 words
A method as in claim 1 including the step of converting said time dependent electric potential into a video signal for storage and display.
Claim 4
Dependent Claim
11 words
A method as in claim 2 including amplifying said video signal.
Claim 5
Dependent Claim
21 words
A method as in claim 3 including the step of rewriting said amplified video signal onto an analog archival storage medium.
Claim 6
Dependent Claim
11 words
A method as in claim 2 including digitalizing said video signal.
Claim 7
Dependent Claim
22 words
A method as in claim 5 including processing said digitalized video signal in a digital computer for image enhancement and pattern recognition.
Claim 8
Dependent Claim
18 words
A method as in claim 5 including storing said digitalized video signal in a digital archival storage medium.
References Cited (Backward Citations)
US2277013A
Cited
US2833930A
Cited
US2853383A
Cited
US2912592A
Cited
US3000735A
Cited
US3069551A
Cited
US3055006A
Cited
US3355289A
Cited
US3412242A
Cited
US3609031A
Cited
US4176275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |