Leakage field decreasing device for CRT display

Details Leakage field decreasing device for CRT display Leakage field decreasing device for CRT display

1996-02-20

1998-08-04

Issing, Gregory C

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 8, 315 85, G09G 104, H01J 2906, H01J 152

Patent

active

057898723

ABSTRACT:
The invention provides a device for effectively decreasing the electric field irradiated from the front surface of a CRT display. This device cancels the leakage field composed of a deflection component and a high voltage ripple component irradiated in the front direction of the CRT by generating an inverse electric field composed of the deflection component and high voltage ripple component. The inverse electric field is obtained by detecting an alternating-current voltage irradiated in the anode portion of the CRT by capacitive coupling a detector to the anode, inverting and amplifying the detected voltage, and applying the inverted voltage to an inverse field generating means installed near the front surface of the CRT.

REFERENCES:
patent: 5151635 (1992-09-01), Capples
patent: 5243262 (1993-09-01), Moen
patent: 5311099 (1994-05-01), Grocki
patent: 5396151 (1995-03-01), Cappels, Sr.
patent: 5432411 (1995-07-01), Beeteson et al.
patent: 5534756 (1996-07-01), Beeteson et al.

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