Magnetism-erasing circuit for use in cathode ray tubes using a D

Details Magnetism-erasing circuit for use in cathode ray tubes using a D Magnetism-erasing circuit for use in cathode ray tubes using a D

1994-12-22

1996-04-23

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 8, 361150, H01J 2956

Patent

active

055106820

ABSTRACT:
A magnetism-erasing circuit for use in cathode ray tubes of portable televisions or the like for erasing the magnetism from the cathode ray tubes is disclosed. The magnetism-erasing circuit includes: a) automatic trigger for an automatically generating trigger signals when a D-C supply is initially applied to the magnetism-erasing circuit, b) trigger detecting means, c) delay and second trigger means for generating second trigger pulses which are delayed by a specified time interval by the detected trigger signals from the trigger detecting means, and d) means for controlling the driving of the magnetism-coil by applying currents to a magnetism-erasing coil. The magnetism-erasing circuit of the present invention further includes manual trigger means for manually generating trigger signals under the condition where a D-C supply has already been applied to the circuit.

REFERENCES:
patent: 5093755 (1992-03-01), Hartmann et al.
patent: 5264478 (1993-11-01), Kim et al.

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