Deflection control circuit for image pick-up tube

Details Deflection control circuit for image pick-up tube Deflection control circuit for image pick-up tube

H - Electricity

01

J

355/13

H01J 29/70 (2006.01) H04N 3/22 (2006.01) H04N 5/228 (2006.01)

Patent

CA 1171972

ABSTRACT OF THE DISCLOSURE A circuit for controlling the deflection of an elec- tron beam in an image pick-up tube of the electro-static deflec- tion type including a target electrode, a cathode electrode for generating the electron beam, and deflection plates for causing the electron beam to scan the target electrode, the circuit in- cluding a current source transistor for generating a current, a first capacitor for storing a voltage corresponding to the gene- rated current, a pair of switching transistors for generating a saw-tooth signal in accordance with the voltage stored by the ca- pacitor and for supplying the saw-tooth signal to the deflection plates for causing the beam to scan an effective image area on the target electrode, a transistor for increasing the amount of current generated by the current source transistor when the effective image area is not being scanned, a circuit for discharg- ing the capacitor during only a portion of the time period when the effective image area is not being scanned and for clamping the level of the saw-tooth signal to an over-scan start potential, and a circuit for clamping the level of the signal to an effective scan start potential when the electron beam begins scanning the effective image area, wherein the electron beam is caused to scan an over-scan area outside the effective image area at a rate faster than used to scan the effective image area so as to neutralize charges in the over-scan area which tend to distort the electron beam.

381321

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