US3831054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage tube erase control
Assignee: RCA Corp
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Filing: 1973-03-23
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Granted: 1974-08-20
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Expires: 1993-03-23
Abstract
Abstract Storage tubes are typically operated in either ERASE, WRITE, or READ modes. In accordance with the invention, there is provided a hybrid mode of operation, incorporating characteristics of both WRITE and READ control, to enhance the removal of previously stored charge patterns during image ERASE operation.
Inventors
- 👤 D Dorsey
- 👤 W Rodda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:06
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N7/122; H04N7/14; H04N7/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
238 words
In an electronic storage device of the type having a target composed of a plurality of insulators arranged on a substrate, input, output, control and focus electrodes, and means for generating an electron beam for applying information signals to the target to establish a desired charge pattern representative thereof upon the writing of said information signals into storage and for thereafter detecting the charge pattern on said target upon the reading of said information signals out of storage, the combination therewith of apparatus for erasing the charge pattern from said target subsequent to the reading of said information signals from storage and prior to the writing of other information signals into storage, said apparatus comprising: means for generating an unmodulated electron beam for scanning the insulators on said substrate; means for applying first bias potentials to said control electrode and to said substrate during a first interval of said unmodulated scanning by said electron beam; and means for applying second bias potentials to said control electrode and to said substrate during a second interval of said unmodulated scanning by said beam, said last-mentioned means applying a more positive potential to said control electrode during said second interval of unmodulated beam scanning as compared to said first interval of unmodulated beam scanning and applying a less positive potential to said substrate during said second interval of unmodulated beam scanning as compared to said first interval of unmodulated beam scanning.
Claim 2
Dependent Claim
238 words
In an electronic storage device of the type having a target composed of a plurality of insulators arranged on a substrate, input, output, control and focus electrodes, and means for generating an electron beam for applying information signals to the target to establish a desired charge pattern representative thereof upon the writing of said information signals into storage and for thereafter detecting the charge pattern on said target upon the reading of said information signals out of storage, the combination therewith of apparatus for erasing the charge pattern from said target subsequent to the reading of said information signals from storage and prior to the writing of other information signals into storage, said apparatus comprising: means for generating an unmodulated electron beam for scanning the insulators on said substrate; means for applying first bias potentials to said control electrode and to said substrate during a first interval of said unmodulated scanning by said electron beam; and means for applying second bias potentials to said control electrode and to said substrate during a second interval of said unmodulated scanning by said beam, said last-mentioned means applying a more positive potential to said control electrode during said second interval of unmodulated beam scanning as compared to said first interval of unmodulated beam scanning and applying a less positive potential to said substrate during said second interval of unmodulated beam scanning as compared to said first interval of unmodulated beam scanning.
Claim 3
Dependent Claim
64 words
The apparatus of claim 1 wherein said first bias potential applying means applies its bias potentials to said control electrode and to said substrate for an interval of said unmodulated electron beam scanning which is less than the interval of said unmodulated beam scanning during which said second bias potential applying means applies its bias potentials to said control electrode and to said substrate.
Claim 4
Dependent Claim
54 words
The apparatus of claim 1 wherein said first bias potential applying means applies a bias potential to said control electrode which is comparable in magnitude to a potential similarly applied to said control electrode during the detection of a charge pattern from said target upon the reading of said information signals out of storage.
Claim 5
Dependent Claim
51 words
The apparatus of claim 3 wherein said first bias potential applying means applies a bias potential to said substrate which is comparable in magnitude to a potential similarly applied to said substrate during the establishment of a charge pattern representative of information signals upon the writing of said signals into storage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |