US3604974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aperiodic linearity correction circuit for crt deflection
Assignee: International Business Machines Corp
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Filing: 1969-12-08
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Granted: 1971-09-14
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Expires: 1989-12-08
Abstract
Abstract A linearity correction circuit for a cathode-ray tube incorporating a horizontal sweep generator which is responsive to a direct coupled, amplified, inverted and rectified version of its output signal, which when integrated by the horizontal sweep generator, causes a decrease in the amplitude of the horizontal sweep signal near the ends of the sweep where the nonlinearity is greatest. No reactive components are utilized in the feedback network enabling the circuit to be reset at any time during a sweep or held in the reset position for any length of time greater than the minimum recovery time of the sweep generator with no effect on the shape of the next sweep.
Inventors
- 👤 David W Phillips
- 👤 George W Van Cleave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:56
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
23 words
The deflection system set forth in claim 1 wherein said defining means comprises a constant voltage bias supply for providing a constant-voltage signal.
Claim 2
Dependent Claim
98 words
The deflection system set forth in claim 2 wherein said differencing means comprises a differential amplifier responsive to said output compensated voltage signal and to said constant voltage signal for providing a first signal proportional to said output compensated voltage signal and a second signal proportional to the inverse of said output compensated voltage signal at the differential output terminals of said differential amplifier, and a rectifier circuit comprising a pair of oppositely polarized diodes connected across said differential output terminals, the terminal of said diodes being joined to provide at the junction thereof said difference voltage signal.
Claim 3
Dependent Claim
59 words
The deflection system set forth in claim 3 wherein said conversion means comprises a transistor having base emitter and collector electrodes, said emitter electrode being connected through a resistor to a supply voltage, said base electrode being connected to the junction of said diodes, and said collector electrode being connected to said means for coupling said feedback current signal.
References Cited (Backward Citations)
US3422305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |