Patent US3569770A successfully refreshed from Google Patents.
US3569770A
Expired / Lapsed
US
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Selective fast erase dark trace scan converter
Assignee: United States Department of the Navy
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Filing: 1968-05-28
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Granted: 1971-03-09
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Expires: 1988-05-28
Abstract
Abstract A dark trace tube and selective write/selective erase system therefor, the tube having a P-10 target for long storage of information written thereon. An electron gun provides a beam which is utilized to either write or erase an image on the P-10 target, depending upon the intensity of the beam. Erasure is effectuated by defocusing and increasing the beam energy to generate heat and may be caused to occur rapidly to erase either the entire raster or selected areas thereof. Additionally, a heater is provided about the inner periphery of the P-10 target for slow, controlled erasure capability. Means are also provided both to selectively write upon the P-10 target and to enhance the contrast of the written image.
Inventors
- 👤 Walter R Gustafson
- 👤 William H Mcmillen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:16
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/06; G01S7/10; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/225; H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/122
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
A long persistence storage tube and control system therefor comprising: an electron gun assembly for supplying electrons in response to the receipt of a signal; heat erasable target means for receiving and storing said supplied electrons; programmer means for providing a control signal; first means for supplying a set of writing signals to said gun assembly for producing electrons of a first energy level including first switch means connected with said programmer means and responsive to said control signal to apply to said gun assembly one of said sets of write signals and erase signals; and second means for supplying a set of erasing signals to said gun assembly for producing electrons of a second energy level having a magnitude greater than said first energy level for generating heat to erase said target means immediately upon impact therewith, including second switch means connected with said programmer means being responsive to said control signal to apply to said gun assembly one of said sets of write signals and erase signals.
Claim 2
Dependent Claim
169 words
A long persistence storage tube and control system therefor comprising: an electron gun assembly for supplying electrons in response to the receipt of a signal; heat erasable target means for receiving and storing said supplied electrons; programmer means for providing a control signal; first means for supplying a set of writing signals to said gun assembly for producing electrons of a first energy level including first switch means connected with said programmer means and responsive to said control signal to apply to said gun assembly one of said sets of write signals and erase signals; and second means for supplying a set of erasing signals to said gun assembly for producing electrons of a second energy level having a magnitude greater than said first energy level for generating heat to erase said target means immediately upon impact therewith, including second switch means connected with said programmer means being responsive to said control signal to apply to said gun assembly one of said sets of write signals and erase signals.
Claim 3
Dependent Claim
29 words
A long persistence storage tube and control system therefor according to claim 1 further including: switch means connected with said programmer means for providing a command pulse signal thereto.
Claim 4
Dependent Claim
222 words
A long persistence storage tube and control system therefor according to claim 2 wherein said programmer comprises: first resettable counter means adapted to receive and count said command pulse signal; first comparator means connected with said first counter means and responsive thereto to provide a signal when said first counter means has reached a first preselected count; second comparator means connected with said first counter means and responsive thereto to provide a signal when said first counter means has reached a second preselected count; decoder means connected with said first counter means and responsive thereto to provide a signal when said first counter means has reached a third predetermined count; second resettable counter means connected with said decoder means to count the signal therefrom; third comparator means connected with said second counter means and responsive thereto to provide a signal when said second counter means reaches a first preselected count; fourth comparator means connected with said second counter means and responsive thereto to provide a signal when said second counter means reaches a second predetermined count; and means operatively connected with said first comparator means and said third comparator means to provide said control signal to said first switch means and said second switch means upon the common occurrence of a signal from said first comparator means and said third comparator means.
Claim 5
Dependent Claim
72 words
A long persistence storage tube and control system therefor according to claim 3 wherein said programmer means further includes: first set-reset flip-flop means connected at the set terminal thereof to said first comparator means and at the reset terminal thereof to said second comparator means; and second set-reset flip-flop means connected at the set terminal thereof to said third comparator means and at the reset terminal thereof to said fourth comparator means.
Claim 6
Dependent Claim
53 words
A long term persistence storage tube and control system therefor according to claim 4 wherein: said decoder means is operatively connected to reset said first counter means; and said second flip-flop means is operatively connected to reset said second counter means upon the receipt thereto of a signal from said fourth comparator means.
Claim 7
Dependent Claim
53 words
A long persistence storage tube and control system therefor according to claim 1 further including: means in proximity with said target mEans for heating said target means to vary the persistence thereof; and means positioned forward of said electron gun assembly for enhancing the contrast of the information written on said target means.
Claim 8
Dependent Claim
41 words
A long persistence storage tube and control system therefor according to claim 1 wherein: said target means includes a thickness of potassium chloride, whereby a dark trace appears thereon upon said target being impinged by electrons having said first energy level.
Claim 9
Dependent Claim
44 words
A long persistence storage tube and control system therefor according to claim 1 further including: switch means operatively connected with said first means and said second means for providing a defocusing voltage during the presence of said second signals having said second energy level.
Claim 10
Dependent Claim
137 words
A long persistence storage tube and control system therefor comprising: an electron gun assembly for supplying electrons in response to the receipt of a signal; heat erasable target means for receiving and storing said supplied electrons; means in proximity with said target means for heating said target means to vary the persistence thereof; means positioned forward of said electron gun assembly for enhancing the contrast of the information written on said target means; first means for supplying a set of writing signals to said gun assembly for producing electrons of a first energy level; and second means for supplying a set of erasing signals to said gun assembly for producing electrons of a second energy level having a magnitude greater than said first energy level for generating heat to erase said target means immediately upon impact therewith.
Claim 11
Dependent Claim
137 words
A long persistence storage tube and control system therefor comprising: an electron gun assembly for supplying electrons in response to the receipt of a signal; heat erasable target means for receiving and storing said supplied electrons; means in proximity with said target means for heating said target means to vary the persistence thereof; means positioned forward of said electron gun assembly for enhancing the contrast of the information written on said target means; first means for supplying a set of writing signals to said gun assembly for producing electrons of a first energy level; and second means for supplying a set of erasing signals to said gun assembly for producing electrons of a second energy level having a magnitude greater than said first energy level for generating heat to erase said target means immediately upon impact therewith.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |