Demagnetizer for display unit

Details Demagnetizer for display unit Demagnetizer for display unit

1994-02-02

1995-12-12

Pascal, Robert J.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

H04N 929

Patent

active

054752833

ABSTRACT:
A demagnetizer for display unit which allows to reliably demagnetize without bothering the user thereof. A start pulse a1 is sent out from a timer 21 to an activating pulse generating circuit 22 in every predetermined time t1 to sent out an activating pulse b. Receiving the activating pulse b, a demagnetizing current generating circuit 23 sends out a demagnetizing current I to a degauss coil 1 to demagnetize a magnetized shadow mask (or aperture grille). The activating pulse b is also supplied to a reset pulse generating circuit 24 to send out a reset pulse c to the timer 21. Thereby a counting of the timer 21 is reset and the start pulse a1 is sent out as the predetermined time t1 elapses. This demagnetizer allows to carry out the demagnetizing action without bothering the user.

REFERENCES:
patent: 4636911 (1987-01-01), Truskalo
patent: 5148083 (1992-09-01), Hatada

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