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Patent US3758825A successfully refreshed from Google Patents.
US3758825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital deflection system for cathode ray tubes
Assignee: BEL TEL LAB Inc
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Filing: 1971-08-20
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Granted: 1973-09-11
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Expires: 1991-08-20
Abstract
Abstract A linearly changing current applied to a deflection coil of a relatively flatfaced cathode ray tube results in a nonlinear sweep on the tube face. The disclosed circuit, which comprises a clock source, a pair of counters, word recognizing circuitry, and a digitally controlled current source, reduces this nonlinearity by producing a sweep current having a nonuniform staircase waveshape.
Inventors
- 👤 W Kapers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:44
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/233; H04N3/2335; G; G09; G09G; G09G1/00; G09G1/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A sweep circuit for energizing a deflection coil of a cathode ray tube, said circuit comprising, a clock source, first and second counters, means connecting said first and second counters to said source to produce output combinations representative of the counts in said counters, means connected between said first and second counters and responsive only to predetermined output combinations from said second counter to make only said first counter nonresponsive to said clock source for the duration of each of said predetermined combinations, and a digitally controlled current source connected between said first counter and said coil and responsive to said first counter output combinations to produce a current in said coil.
Claim 2
Dependent Claim
112 words
A sweep circuit for energizing a deflection coil of a cathode ray tube, said circuit comprising, a clock source, first and second counters, means connecting said first and second counters to said source to produce output combinations representative of the counts in said counters, means connected between said first and second counters and responsive only to predetermined output combinations from said second counter to make only said first counter nonresponsive to said clock source for the duration of each of said predetermined combinations, and a digitally controlled current source connected between said first counter and said coil and responsive to said first counter output combinations to produce a current in said coil.
Claim 3
Dependent Claim
35 words
A sweep circuit in accordance with claim 1 in which said means comprises a plurality of matching gates connected to said second counter to produce outputs on the occurrence of said predetermined output combinations, respectively.
Claim 4
Dependent Claim
101 words
A sweep circuit for energizing a deflection coil of a cathode ray tube, said circuit comprising a clock source, first and second counters, a normally enabled gate connected between said soUrce and said first counter, means connecting said second counter to said source for receiving clock pulses from said source whenever said source produces such pulses, means connecting said second counter to said gate to disable said gate in response to predetermined output combinations from said second counter for the duration of each of said predetermined combinations, and a digitally controlled current source connected between said first counter and said coil.
Claim 5
Dependent Claim
101 words
A sweep circuit for energizing a deflection coil of a cathode ray tube, said circuit comprising a clock source, first and second counters, a normally enabled gate connected between said soUrce and said first counter, means connecting said second counter to said source for receiving clock pulses from said source whenever said source produces such pulses, means connecting said second counter to said gate to disable said gate in response to predetermined output combinations from said second counter for the duration of each of said predetermined combinations, and a digitally controlled current source connected between said first counter and said coil.
Claim 6
Dependent Claim
64 words
A sweep circuit in accordance with claim 3 in which the last-mentioned means comprises a plurality of matching gates connected to said second counter to produce outputs on the occurrence of said predetermined output combinations, respectively, and an OR gate connected between said matching gates and said normally enabled gate to disable said normally enabled gate in response to outputs from said OR gate.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |