Vertical deflection device for use in television receivers

Claim 2

A vertical deflection device comprising a pulse oscillator which oscillates in synchronism with synchronizing signals applied thereto; a switching element driven by said oscillator; an integrating circuit connected to the output terminal of said switching element; a deflection coil connected to said integrating circuit; the pulse width of the pulse generated by said pulse oscillator being smaller than the pulse width of the pulse appearing at the connection between said deflection coil and integrating circuit during the fly-back time, and means applying the pulse from said pulse oscillator and one of the pulse appearing at said connection of said deflection coil and the pulse produced in response to said second mentioned pulse to said switching element whereby the switching time of said switching element is determined by said one pulse.

Claim 3

A vertical deflection device as set forth in claim 1 wherein a differentiation circuit is connected to said connection of said vertical deflection coil, and the output of said differentiation circuit is limited in amplitude and applied to the input terminal of said switching element.

Claim 4

A vertical deflection device as set forth in claim 1 wherein a differentiation circuit consisting of a capacitor and a resistor is connected to said connection of said deflection coil; the output of said differentiation circuit is applied to the input terminal of said switching element through a resistor; and the output of said pulse oscillator is simultaneously applied to said input terminal of said switching element through a diode.

Claim 5

A vertical deflection device as set forth in claim 1 wherein said integrating circuit is a Miller integrating circuit comprised of an amplifier and a capacitance feedback circuit.

Claim 6

A vertical deflection device as set forth in claim 4 wherein a circuit for differentiating the signal from said capacitance feedback circuit is provided, and the output waveform of said differentiating circuit is shaped for application to said switching circuit as the input.

Claim 7

In a vertical deflection system having a source of synchronizing signals, a deflection coil system including means providing fly-back pulses, and means for driving said deflection coil system; the improvement wherein said driving means comprises a pulse oscillator for generating first pulses of lesser duration than said fly-back pulses and connected for synchronization to said source of synchronizing signals, a switching element, an integrating circuit connected to the output of said switching element, means connecting said coil system to the output of said integrating circuit, and means for controlling said switching element comprising means applying said first pulses to said switching circuit for controlling the initiation of operation of said switching element, and means responsive to said fly-back pulses for controlling the operation period of said switching element as a function of the width of said fly-back pulses.

Claim 8

In a vertical deflection system having a source of synchronizing signals, a deflection coil system including means providing fly-back pulses, and means for driving said deflection coil system; the improvement wherein said driving means comprises a pulse oscillator for generating first pulses of lesser duration than said fly-back pulses and connected for synchronization to said source of synchronizing signals, a switching element, an integrating circuit connected to the output of said switching element, means connecting said coil system to the output of said integrating circuit, and means for controlling said switching element comprising means applying said first pulses to said switching circuit for controlling the initiation of operation of said switching element, and means responsive to said fly-back pulses for controlling the operation period of said switching element as a function of the width of said fly-back pulses.