Method of and apparatus for canceling electric field

Details Method of and apparatus for canceling electric field Method of and apparatus for canceling electric field

1993-12-28

1995-04-04

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 8, 315 85, 361150, H01J 2956

Patent

active

054040841

ABSTRACT:
An electric field cancellation apparatus that can reduce electric field radiation from a cathode ray tube inexpensively includes a canceling pulse generating circuit generating a pulse voltage that cancels a leaked electric field radiated from a high voltage generating circuit employed with a deflection circuit or the like. The canceling pulse voltage is superimposed upon an output voltage of the high voltage generating circuit and is applied through an anode to an aperture grill of the cathode ray tube, whereby an electric field having a phase opposite to that of the leaked electric field is radiated from the whole surface of the aperture grill, so that the leaked electric field radiated from the cathode ray tube can be canceled.

REFERENCES:
patent: 5151635 (1992-09-01), Cappels
patent: 5231332 (1993-07-01), Beaumont et al.
patent: 5243262 (1993-09-01), Moen
patent: 5260626 (1993-11-01), Takase et al.
patent: 5311099 (1994-05-01), Grocki

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