Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-04-30
1991-07-30
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315386, G09G 104, H01J 2952
Patent
active
050362607
ABSTRACT:
A source of kine supply voltage is coupled to a video amplifier that drives a cathode of a cathode ray tube of a projection television receiver via a self biasing diode. When, due to, for example, a fault condition, the kine supply voltage is lost, the self biasing diode decouples the cathode of the cathode ray tube from a supply return terminal of an ultor supply voltage to form a high impedance, low capacitance at the cathode of the cathode ray tube. A beam current develops a self biasing voltage at the cathode of the cathode ray tube that substantially reduces the beam current to provide protection against a damage to a screen of the cathode ray tube.
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Pages 1 & 2 of schematic diagram entitled Rear Projection CRT Board, dated 3/25/88 and 1/12/89.
U.S. Pat. Appl. RCA 86,031 entitled A Protection Circuit for a Cathode Ray Tube, in the name of John Barrett George.
U.S. Pat. Appl. RCA 86,033 entitled A Deflection Loss Protection Arrangement for a CRT, in the names of Leroy Samuel Wignot and Lawrence Edward Smith.
Schematic diagram for PV-140/Digital (G) Zenith rear proj. color digital TV receiver, reprinted in Profax, May 1990.
U.S. Pat. Appl. RCA 86,041 entitled Projection TV Deflection Loss Protection Circuit, in the names of Marvin Neil Norman, Lawrence Edward Smith & Peter Ronald Knight.
U.S. Pat. Appl. RCA 85,651 entitled Video Display Apparatus with Kinescope Spot Burn Protection Circuit, in the names of Thomas David Gurley and Leroy Samuel Wignot.
Henig Sammy S.
Issing Gregory C.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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