Picture reproduction apparatus with a cathode ray tube and an ar

Details Picture reproduction apparatus with a cathode ray tube and an ar Picture reproduction apparatus with a cathode ray tube and an ar

1989-09-01

1991-01-22

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315383, G09G 104, H01J 2958

Patent

active

049873504

ABSTRACT:
A video-display unit in which the beam current of a cathode-ray tube is measured for a predetermined time interval during display of some lines exterior to an image, for establishing automatic cutoff for the electronic beam. This electron beam is defocused during that predetermined time interval, and the defocusing is independent of the contents of the image, so that initial lines are substantially invisible. An electronic switch may be provided for decreasing the focusing voltage of the cathode ray tube. The electronic switch may be a high-vacuum tube connected to the focusing electrode of the cathode-ray tube, or this switch may be a transistor connected through a transformer to the focusing electrode. The transformer may be attenuated.

REFERENCES:
patent: 4540919 (1985-09-01), Ryan
patent: 4763048 (1988-08-01), Schiller
patent: 4827183 (1989-05-01), Seats

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