Method and apparatus for automatically controlling highlight eff

Details Method and apparatus for automatically controlling highlight eff Method and apparatus for automatically controlling highlight eff

1982-01-08

1985-09-10

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358223, 315381, H01J 2952

Patent

active

045409196

ABSTRACT:
During the horizontal retrace scan period of a scanning beam in a television pickup tube, the beam current is increased to the maximum possible value to recharge the target layer, and the cathode voltage is raised by a few volts to prevent readout of normal video. Also, the scanning beam path may be modified to insure that every area of the image is scanned by the retrace scan prior to being scanned by the active picture scan.

REFERENCES:
patent: 3955116 (1976-05-01), van den Berg
patent: 3999011 (1976-12-01), Sato et al.
patent: 4097901 (1978-06-01), Peters
patent: 4141043 (1979-02-01), Liu
patent: 4143305 (1979-03-01), Gibson et al.
patent: 4149110 (1979-04-01), Dallos
patent: 4166281 (1979-08-01), Dischert et al.
patent: 4229767 (1980-10-01), Ryan
patent: 4237491 (1980-12-01), Olson et al.
patent: 4249215 (1981-02-01), Himmelbauer
patent: 4379310 (1983-04-01), Bendell
patent: 4380028 (1983-05-01), Pepin
Childress et al., IBM Disclosure; CRT Light Output Enhancement Technique, vol. 13, No. 5, Oct.1970.
J. H. T. Van Roosmalen, 4th Symp. on Photoelectronic Image Devices, vol. 28A, 1969, "Adjustable Saturation in a Pick-Up Tube with Linear Light Transfer Characteristics".
"New Technological Development in Camera Tubes", 6th T.V. Symp., Montreux, Switzerland, May 19-23, 1969.

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