Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural ray-type tube
Patent
1979-04-19
1980-11-04
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Plural ray-type tube
328123, H01J 2950, H01J 3100
Patent
active
042322502
ABSTRACT:
An improved erase cycle for direct-viewing bistable storage tubes that substantially eliminates the bright flash characteristic of conventional erasure methods. As applied to the backplate of a meshless storage tube, the improved cycle suitably comprises two or more short (about 2 to 10 ms) fade positive pulses separated by a negative, decaying recovery pulse about 50-100 ms in length and optionally, a "dead time" of about 200 ms at the target operating level. The final fade positive pulse is followed by a longer recovery interval that gradually increases the backplate voltage to its previous operating level while the flood guns retain the storage phosphor in an erased, unwritten condition.
REFERENCES:
patent: 3293473 (1966-12-01), Anderson
patent: 3413513 (1968-12-01), Donoghue et al.
patent: 3594607 (1971-07-01), Frankland
patent: 3611000 (1971-10-01), Johnston
patent: 3970889 (1976-07-01), Cobb
Devere, Storage Cathode-Ray Tubes and Circuits, 2nd Ed., 1971, Tektronix Circuit Concepts Series, pp. 19, 20, 47-52.
Schmid, Principles of Storage Tubes and Oscilloscopes, 3rd Ed., 1977, Tektronix, U.K. Ltd., pp. 17, 18.
Blum Theodore M.
Tektronix Inc.
Winkelman John D.
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