US3774066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interactive-display storage cathode ray tube
Assignee: International Business Machines Corp
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Filing: 1972-01-31
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Granted: 1973-11-20
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Expires: 1992-01-31
Abstract
Abstract Modification of a display storage cathode ray tube that employs an electron beam for impingement on an insulating phosphor to switch the latter from an OFF state (low voltage) to its ON state (high voltage), using a flood beam of electrons to maintain the phosphor stably either at high or low voltage. Modification consists in using a light pen, having a higher intensity or different spectral distribution than the ambient light of the cathode ray tube, which is used to shift the voltage of the phosphor by photoconductive action toward the potential of a backplate to achieve either writing or erasing, depending on the backplate potential.
Inventors
- 👤 B Kazan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:35
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/122
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
Charge image storage apparatus capable of bistable storage comprising a transparent photoconductive phosphor, a transparent mesh electrode, adjacent said phosphor, connected to a source of electrical energy and acting as a collector of secondary electrons, means for bombarding said phosphor surface facing said mesh with electrons to cause secondary electrons to be emitted from said phosphor whereby said mesh electrons collects said secondary electrons, a transparent backplate electrode on the opposite surface of and in electrical contact with said phosphor, means for maintaining one of two reference potentials on said transparent electrode, said reference potentials being selectable at will, and a light-emitting pen for shining a pattern of light through said backplate electrode while the latter is maintained at a potential substantially below said collector mesh electrode potential so as to extinguish light emission from previously light-emitting areas of said phosphor.
Claim 2
Dependent Claim
141 words
Charge image storage apparatus capable of bistable storage comprising a transparent photoconductive phosphor, a transparent mesh electrode, adjacent said phosphor, connected to a source of electrical energy and acting as a collector of secondary electrons, means for bombarding said phosphor surface facing said mesh with electrons to cause secondary electrons to be emitted from said phosphor whereby said mesh electrons collects said secondary electrons, a transparent backplate electrode on the opposite surface of and in electrical contact with said phosphor, means for maintaining one of two reference potentials on said transparent electrode, said reference potentials being selectable at will, and a light-emitting pen for shining a pattern of light through said backplate electrode while the latter is maintained at a potential substantially below said collector mesh electrode potential so as to extinguish light emission from previously light-emitting areas of said phosphor.
Claim 3
Dependent Claim
146 words
Charge image storage apparatus capable of bistable storage comprising a storage target including a phosphor, a transparent mesh electrode, adjacent said phosphor, connected to a source of electrical energy and acting as a collector of secondary electrons, means for bombarding said phosphor surface facing said mesh with electrons to cause secondary electrons to be emitted from said phosphor whereby said mesh electrode collects said secondary electrons, a transparent photoconductor layer on the opposite surface of and in contact with said phosphor, a transparent backing electrode in contact with said photoconductor layer, means for maintaining one of two different reference potentials on said backplate electrode, and a light-emitting pen for shining a pattern of light through said backplate electrode while the latter is maintained at a potential substantially below said collector mesh electrode potential so as to extinguish light emission from previously light-emitting areas of said phosphur.
Claim 4
Dependent Claim
146 words
Charge image storage apparatus capable of bistable storage comprising a storage target including a phosphor, a transparent mesh electrode, adjacent said phosphor, connected to a source of electrical energy and acting as a collector of secondary electrons, means for bombarding said phosphor surface facing said mesh with electrons to cause secondary electrons to be emitted from said phosphor whereby said mesh electrode collects said secondary electrons, a transparent photoconductor layer on the opposite surface of and in contact with said phosphor, a transparent backing electrode in contact with said photoconductor layer, means for maintaining one of two different reference potentials on said backplate electrode, and a light-emitting pen for shining a pattern of light through said backplate electrode while the latter is maintained at a potential substantially below said collector mesh electrode potential so as to extinguish light emission from previously light-emitting areas of said phosphur.
Claim 5
Dependent Claim
46 words
The apparatus of claim 2 including a filter in front of both said light-emitting pen and said storage target, said filter being highly absorbent of both ambient light and light which photoconductively excites said phosphor, but is highly transmissive of the radiation emitted by aid phosphor.
Claim 6
Dependent Claim
39 words
The apparatus of claim 3 wherein means are provided for actuating both the position and light-emission of said light-emitting pen while the relative position of said filter with respect to said light-emitting pen and said storage target remains fixed.
References Cited (Backward Citations)
US2547638A
Cited
US2855589A
Cited
US3189889A
Cited
US3325673A
Cited
US3426236A
Cited
US3586861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |