Current drive deflection apparatus utilizing constant current generator

Claim 2

Apparatus for deflecting an electron beam in a cathode ray tube comprising: a deflection winding; means for providing a constant current; current control means; current amplifier means connected to said means for providing a constant current, to said current control means, and to said winding for providing a current to said winding in response to the difference of the current flowing through said current control means and the constant current from said means for providing a constant current; and means connected to said current control means for varying the conduction of said current control means to apply a current of predetermined waveform to said wiNding.

Claim 3

Apparatus as defined in claim 1 wherein said current amplifier means includes: a first amplifier having an input means connected to said means for providing a constant current and to said current control means and an output means connected in circuit with said winding; and a second amplifier having an input means connected to said current control means and to said means for providing a constant current and an output means connected in circuit with said winding.

Claim 4

Apparatus as defined in claim 2 wherein said first amplifier includes a first transistor and a second transistor each having input means and output means, said input means of said first transistor comprising the input means of said first amplifier, said output means of said second transistor being connected to the output means of said first amplifier, and said output means of said first transistor being connected to said input means of said second transistor, and wherein said second amplifier includes a third transistor and a fourth transistor each having input means and output means, said input means of said third transistor comprising the input means of said second amplifier, said output means of said fourth transistor being connected to the output means of said second amplifier, and said output means of said third transistor being connected to said input means of said fourth transistor.

Claim 5

Apparatus as defined in claim 2 wherein said first and second amplifiers each include resistance means connected from the input means to the output means thereof for controlling the gains of said first and second amplifiers.

Claim 6

Apparatus as defined in claim 2 wherein said current amplifier means includes potential reference means connected between the input means of said first amplifier and the input means of said second amplifier.

Claim 7

Apparatus as defined in claim 1 including direct current feedback means connected between said current amplifier means and said means for providing a constant current for stabilizing said means for providing a constant current.

Claim 8

Apparatus as defined in claim 1 including feedback means connected in circuit with said winding and further connected to said means for providing a constant current for providing alternating feedback to compensate for non-linearities of the current through said winding.

Claim 9

Apparatus as defined in claim 1 including means for generating a pincushion correction signal connected to said current amplifier means, said current amplifier means combining the pincushion correction signal with the current of a predetermined waveform.

Claim 10

Apparatus as defined by claim 1 wherein said means for varying the conduction of said current control means includes: oscillator means for providing signals at the sweep rate of the cathode ray tube; integrating means; means connecting said winding to said integrating means; means connecting said oscillator means to said integrating means; and means connecting said integrating means to said current control means.

Claim 11

Apparatus as defined in claim 9 wherein said integrating means includes a series connected resistance means and capacitance means, said winding being connected in series with a capacitor with the junction between said winding and said capacitor being connected to said resistance means, said oscillator means being connected to a junction between said resistance means and said capacitance means whereby pulses provided by said oscillator means periodically discharge said capacitance means, and a junction between said resistance means and said capacitance means is connected to said current control means.

Claim 12

In a television receiver including a cathode ray tube, apparatus for deflecting an electron beam in the cathode ray tube comprising: a deflection winding; first transistor means biased for generating a constant current; second transistor means; a complementary current amplifier connected between said first transistor means, said second transistor means, and said deflectIon winding for amplifying the difference of the currents flowing through said first and second transistors and applying the amplified difference current to said deflection winding; and means connected to said second transistor means for providing a sawtooth signal thereto whereby the conduction of said second transistor means is varied to vary the amount of current flowing through said deflection winding.

Claim 13

In a television receiver including a cathode ray tube, apparatus for deflecting an electron beam in the cathode ray tube comprising: a deflection winding; first transistor means biased for generating a constant current; second transistor means; a complementary current amplifier connected between said first transistor means, said second transistor means, and said deflectIon winding for amplifying the difference of the currents flowing through said first and second transistors and applying the amplified difference current to said deflection winding; and means connected to said second transistor means for providing a sawtooth signal thereto whereby the conduction of said second transistor means is varied to vary the amount of current flowing through said deflection winding.

Claim 14

Apparatus as defined in claim 11 wherein said means for providing a sawtooth signal includes: an integrating means connected to said deflection winding for receiving a parabolic signal therefrom; an oscillator means connected to said integrating means for providing reset signals thereto; and means connecting said integrating means to said second transistor means for providing the sawtooth signal thereto.

Claim 15

Apparatus as defined in claim 12 wherein said integrating means includes a resistance means and a capacitance means connected in series with a source of energizing potential.

Claim 16

Apparatus as defined in claim 11 wherein a direct current feedback means is connected between an output of said complementary current amplifier and said first transistor means for stabilizing the constant current provided by said first transistor means, and a potential reference means is connected between said first and second transistor means for stabilizing the voltage therebetween.

Claim 17

Apparatus as defined in claim 11 including convergence apparatus connected to said deflection winding for receiving a parabolic waveform therefrom.

Claim 18

Apparatus as defined in claim 11 including feedback means connected in circuit with said winding and further connected to said first transistor means for providing alternating feedback to compensate for non-linearities of the current through said winding.

Claim 19

Apparatus as defined in claim 16 wherein said feedback means includes a capacitor.