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Focusing-voltage-output-circuit-for-cathode-ray-tube

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Focusing voltage output circuit for cathode ray tube

Details

Inventors: Yuki, Ikuo;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

In a focusing voltage output circuit for a cathode ray tube, a variable impedance circuit is connected in series with a variable resistor for adjustment of focusing voltage. The impedance of the variable impedance circuit is changed in response to a video luminance signal or a beam current to change the focusing voltage so as to optimize the focus tracking characteristic.

DETAILED DESCRIPTION This invention contemplates elimination of the above prior art drawbacks and has for its object to provide a focusing voltage output circuit which can always realize an optimized focus tracking characteristic irrespective of the focus tracking characteristic of the FBT.
According to this invention, a variable impedance circuit is connected in series with a variable resistor for focusing voltage adjustment, and the impedance of the variable impedance circuit is changed with a video luminance signal or a beam current to change the focusing voltage so that the focus tracking characteristic can be optimized.

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