CRT Degaussing system

Details CRT Degaussing system CRT Degaussing system

1982-09-29

1984-04-24

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

361150, H01F 1300

Patent

active

044450729

ABSTRACT:
A degaussing system in a CRT device detects a trigger pulse and provides a timed control pulse which controls a power circuit "on" time. The power supplied to the degaussing coil is gradually reduced by the increasing resistance of a PTC thermistor in series with the degaussing coil, then turned off by the end of the control pulse. Degaussing can be initiated manually or automatically as often as desired, and may be triggered automatically in response to a predetermined period of device inactivity.

REFERENCES:
patent: 3872347 (1975-03-01), Matsushima et al.
patent: 3879633 (1975-04-01), Stark, Jr.
patent: 3896330 (1975-07-01), Chamberlain
patent: 3982153 (1976-09-01), Burdick et al.

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