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    Degaussing circuit with bucking current source for reducing current in degaussing coil to zero
    1.
    发明授权
    Degaussing circuit with bucking current source for reducing current in degaussing coil to zero 失效
    降低电流消耗电流以减少线圈中的电流为零

    公开(公告)号：US3657729A

    公开(公告)日：1972-04-18

    申请号：US3657729D

    申请日：1970-05-06

    Applicant: MOTOROLA INC

    Inventor： HANSEN ROBERT B ,  SLAVIK WILLIAM H

    IPC: H04N9/29 ,  H01J31/20 ,  H01F13/00

    CPC classification number: H04N9/29

    Abstract: A degaussing circuit used in a color television receiver includes a positive temperature coefficient resistor connected in series with the degassing coil, and in addition includes a circuit coupled with the filament winding of the receiver for applying a current through the coil in phase opposition to the current through the positive temperature coefficient resistor. The opposition current is of a magnitude equal to the residual current through the positive temperature coefficient resistor to reduce the current in the degaussing coil to zero after the degaussing operation is complete.

    Abstract translation: 在彩色电视接收机中使用的消磁电路包括与脱气线圈串联连接的正温度系数电阻器，并且还包括与接收器的灯丝绕组耦合的电路，用于与电流相反地施加电流通过线圈 通过正温度系数电阻。 对置电流的大小等于通过正温度系数电阻器的剩余电流，以在消磁操作完成后将消磁线圈中的电流降至零。

    Automatic brightness control circuit for establishing the black level of signals in a television reciver
    2.
    发明授权
    Automatic brightness control circuit for establishing the black level of signals in a television reciver 失效
    用于在电视接收机中建立黑信号的自动亮度控制电路

    公开(公告)号：US3588341A

    公开(公告)日：1971-06-28

    申请号：US3588341D

    申请日：1969-04-01

    Applicant: MOTOROLA INC

    Inventor： HANSEN ROBERT B

    IPC: H04N5/57 ,  H04M5/16

    CPC classification number: H04N5/57

    Abstract: IN AN AUTOMATIC BRIGHTNESS CONTROL CIRCUIT FOR A COLOR TELEVISION RECEIVER USING DIRECT DEMODULATION OF THE COLOR AND BRIGHTNESS SIGNALS, THE SIGNALS PRESENT ON THE BASE AND EMITTER OF THE GREEN NPN OUTPUT TRANSISTOR AMPLIFIER ARE COMPARED BY CONNECTING THEM ACROSS THE BASE-EMITTER PATH OF A PNP TRANSISTOR, AND WHENEVER THE NPN TRAMSISTOR IS CUT OFF, INDICATIVE OF A BLACK LEVEL SIGNALS, THE PNP COMPARISON TRAMSISTOR IS RENDERED CONDUCTIVE. THE COLLECTOR OF THE COMPARISON TRANSISTOR IS CONNECTED THROUGH AN INTEGRATING CIRCUIT, THE OUTPUT OF WHICH IS USED TO VARY THE DC OPERATING LEVELS OF THE THREE DRIVER AMPLIFIERS IN A CLOSED LOOP CONTROL SYSTEM.

    Horizontal pincushion correction circuit
    4.
    发明授权
    Horizontal pincushion correction circuit 失效
    水平引线校正电路

    公开(公告)号：US3571653A

    公开(公告)日：1971-03-23

    申请号：US3571653D

    申请日：1967-08-18

    Applicant: MOTOROLA INC

    Inventor： HANSEN ROBERT B ,  MCSHANE JAMES P JR

    IPC: H04N3/233 ,  H01J29/76

    CPC classification number: H04N3/233

    Abstract: The circuit includes means to develop a parabolic signal at the vertical sweep frequency for controlling the bias on the output device in the horizontal sweep system. The polarity of the signal is such as to cause increasing conduction of the device towards the top and bottom of the raster and since the output device mainly controls scan on the right side of the raster, this serves to increase distortion on the right side in order to approach the greater distortion which normally appears on the left side. The circuit further includes means to simultaneously correct the distortion on both sides and straighten the raster.

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