USRE28631E
Expired / Lapsed
US
⏱️ 0.0 years remaining
High voltage deflection correction in CRT displays
Assignee: —
•
Filing: 1974-09-16
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Granted: 1975-11-25
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Expires: 1994-09-16
Abstract
Abstract The X and Y deflection voltages for a CRT display are corrected to accommodate excursions in the acceleration or anode voltage of a CRT display by multiplication with a signal which is a function of the square root of the high voltage. The invention (may be practiced following pincushion correction (correction for a planar CRT screen geometry), or directly. A second embodiment) integrates pincushion and anode voltage correction, thereby to require fewer and simpler circuits.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:00
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/233; H04N3/2335
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
195 words
In a cathode ray tube display system receiving raw x and y deflection voltages to govern desired displays on the cathode ray tube, the deflection voltage modificationn apparatus comprising: a cathode ray tube having a high voltage anode; a high voltage supply providing an anode voltage to the anode of said cathode ray tube; means responsive to said high voltage supply for providing a signal as a function of the square root of said anode voltage; (sun) sum means receiving raw x and y deflection voltage signals and providing a negative scalar of the sum of the squares thereof; means responsive to said sum means (,) and said square root means (and said high voltage supply) for providing a signal which is a function of said (anode voltage) square root signal minus the product of said square root signal and said negative scalar function of said sums of squares signals; and means receiving said raw x and y deflection voltages and responsive to said last named means for providing X and Y deflection signals to said cathode ray tube as respective products of the output of said last named means and said raw deflection voltages.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |