Wide angle deflection system

Claim 2

In combination with a narrow-neck, large screen shadow-mask color kinescope; a wide-angle toroidal deflection yoke mounted on said kinescope neck and having respective vertical deflection winding halves and respective horizontal deflection winding halves; and a thyristor horizontal deflection circuit driving said horizontal deflection winding halves in parallel; apparatus comprising: a vertical deflection circuit including a quasi-complementary symmetry, Class B, push-pull output, transistor deflection wave amplifier; and means providing a transformerless coupling of the output of said quasi-complementary symmetry amplifier across the series combination of said vertical deflection winding halves of said toroidal yoke; said vertical deflection circuit also including: a pre-driVer transistor stage having an input terminal, and having an output terminal for supplying input signals to said quasi-complementary symmetry amplifier; resistive means in series with said vertical winding halves for developing a voltage wave at a feedback terminal in response to deflection current traversing said winding halves; a feedback path for said voltage wave comprising a capacitor coupled between said feedback terminal and said predriver transistor input terminal; and means for periodically charging and discharging said capacitor; said feedback path also including a diode in series with said capacitor, said diode being poled for forward conduction upon charging of said capacitor.

Claim 3

Apparatus in accordance with claim 1 wherein said feedback path also includes an additional diode connected in shunt with said first-named diode but with opposite poling for forward conduction upon discharging of said capacitor.

Claim 4

A transistor deflection circuit including: a phase-inverting deflection wave amplifier having an input terminal and an output terminal; a deflection yoke winding; a current sampling resistor; means for connecting said winding and said resistor in series between said output terminal and a point of reference potential a feedback path including a capacitor coupled between the junction of said winding and resistor and said input terminal; a charging potential source; a charging resistor coupled between said source and said input terminal; a discharge transistor coupled between said input terminal and a point of reference potential, and subject to periodic conduction and non-conduction; and a pair of paralleled oppositely poled diodes disposed in said feedback path in series with said capacitor.

Claim 5

A transistor deflection circuit including: a phase-inverting deflection wave amplifier having an input terminal and an output terminal; a deflection yoke winding; a current sampling resistor; means for connecting said winding and said resistor in series between said output terminal and a point of reference potential a feedback path including a capacitor coupled between the junction of said winding and resistor and said input terminal; a charging potential source; a charging resistor coupled between said source and said input terminal; a discharge transistor coupled between said input terminal and a point of reference potential, and subject to periodic conduction and non-conduction; and a pair of paralleled oppositely poled diodes disposed in said feedback path in series with said capacitor.

Claim 6

A transistor deflection circuit including: a multistage phase-inverting deflection wave amplifier having an input terminal and an output terminal, and including an input stage transistor coupled to said input terminal; a deflection yoke winding; a current sampling resistor; means for connecting said winding and said resistor in series between said output terminal and a point of reference potential; a feedback path including a capacitor coupled between the junction of said winding and resistor and said input terminal; a charging potential source; charging resistance means coupled between said source and said input terminal and including a variable resistor for controlling the rate of charging of said capacitor; means including a discharge transistor, coupled between said input terminal, and a point of reference potential, and subject to periodic conduction and non-conduction, for periodically discharging said capacitor, the conduction of said discharge transistor effecting the discharging of said capacitor and cutting off said input stage transistor; means for effecting a step rise in the potential at said input terminal, upon each periodic cessation of conduction by said discharge transistor, at a rate substantially higher than said charging rate, the magnitude of said step rise in potential being substantially independent of the setting of said variable resistor, said effecting means comprising a first diode, in series with said capacitor in said feedback path, and poled for forward conduction upon charging of said capacitor; and means for bypassing said first diode during the discharging of said capacitor, said bypassing means comprising a second diode in shunt with said first diode and poled for forward conduction upon discharging of said capacitor.

Claim 7

A transistor deflection circuit including: a multistage phase-inverting deflection wave amplifier having an input terminal and an output terminal, and including an input stage transistor coupled to said input terminal; a deflection yoke winding; a current sampling resistor; means for connecting said winding and said resistor in series between said output terminal and a point of reference potential; a feedback path including a capacitor coupled between the junction of said winding and resistor and said input terminal; a charging potential source; charging resistance means coupled between said source and said input terminal and including a variable resistor for controlling the rate of charging of said capacitor; means including a discharge transistor, coupled between said input terminal, and a point of reference potential, and subject to periodic conduction and non-conduction, for periodically discharging said capacitor, the conduction of said discharge transistor effecting the discharging of said capacitor and cutting off said input stage transistor; means for effecting a step rise in the potential at said input terminal, upon each periodic cessation of conduction by said discharge transistor, at a rate substantially higher than said charging rate, the magnitude of said step rise in potential being substantially independent of the setting of said variable resistor, said effecting means comprising a first diode, in series with said capacitor in said feedback path, and poled for forward conduction upon charging of said capacitor; and means for bypassing said first diode during the discharging of said capacitor, said bypassing means comprising a second diode in shunt with said first diode and poled for forward conduction upon discharging of said capacitor.

Claim 8

Apparatus in accordance with claim 4 wherein said multistage amplifier includes a quasi-complementary symmetry push-pull output circuit responsive to the output of said input stage transistor and capacitively coupled to the series combination of said deflection yoke winding and current sampling resistor.