JPS61145968A - Pincushion distortion correcting device - Google Patents

Abstract

PURPOSE:To make a circuit simple, to decrease the cost and to save the space by adding a saw tooth, wave voltage obtained at a vertical oscillating circuit, and generating a parabolic wave signal necessary to right and left pincushion distortion correcting circuits. CONSTITUTION:A vertical saw tooth wave voltage generated at the vertical oscillating circuit is inputted through a resistance R1 to a correcting circuit. A transistor Q1 is for a parabolic signal amplifying and transistors Q2 and Q3 are for the parabolic signal output of Darlington connection. A vertical saw tooth wave voltage converts resistances R1 and R2 to a parabolic wave signal by an integrating circuit composed of a capacitor C1, and inputs to a base of a parabolic amplifying transistor Q1. The parabolic wave signal outputted from the collector is inputted to the base of the transistor Q2, amplified at the transistors Q2 and Q3, the parabolic wave signal outputted from a collector of the transistor Q3 is overlapped to a horizontal deflecting electric current, added to right and left pincushion distortion correcting circuits and pincushion distortion is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pincushion distortion correction device used in a television receiver.

In the left and right pincushion distortion correction circuits of conventional television receivers, it is necessary to use parabolic wave signals for correction. Conventionally, the parabolic wave signal was supplied by applying the vertical output waveform of the vertical deflection circuit to the primary side of the transformer T1 and passing the input obtained from the secondary side through the resistor R1 through the diode D1, as shown in Figure 2.゜-! In addition to an integrating circuit consisting of a capacitor C1 and a resistor R2, a parabolic wave signal is generated and applied to the base of a transistor Q1, or as shown in FIG. 3, a parabolic wave signal output IC1 is used to supply the parabolic wave signal.

Problems to be Solved by the Invention However, in such conventional circuits, the number of components becomes complicated, which increases costs and prevents space saving of printed circuit boards.

The present invention solves these conventional problems and reduces costs by simplifying the circuit.

It also aims to save space.

Means for Solving the Problems In the present invention, the sawtooth wave voltage obtained by the vertical oscillation circuit is applied to the integrating circuit in order to generate the parabolic wave signal necessary for the left and right pincushion distortion correction circuits. be.

According to the present invention, the signal source for obtaining the parabolic wave signal is made into a vertical oscillation circuit and its sawtooth wave voltage output is utilized, thereby eliminating the need for obtaining the signal from the conventional vertical output stage. Since there is no need for a transformer or a dedicated parabolic waveform output IC, cost and space savings can be achieved.

Example Embodiments of the present invention will be described below with reference to circuit diagrams.

As shown in FIG. 1, a vertical sawtooth voltage generated by a vertical oscillation circuit is input to a correction circuit via a resistor R1.

Transistor Q1 is for parabolic signal amplification, transistor Q2. Q3 is a Darlington-connected parabolic signal output transistor.

The vertical sawtooth voltage is applied to resistors R1, R2 and capacitor C2.
It is converted into a parabolic wave signal by an integrating circuit consisting of the following, and is input to the pace of the parabolic amplification transistor Q1. The parabolic wave signal output from the collector is the transistor Q2
A parabolic wave signal is input to the horizontal deflection current, amplified by transistors Q2 and Q03, and output from the collector of transistor Q3.

This corrects pincushion distortion.

Effects of the Invention As described above, the circuit of the present invention has a vertical oscillation circuit.
Since a parabolic wave signal is generated using a wave voltage, the circuit is simplified, and costs and space can be saved.

[Brief explanation of the drawing]

FIG. 3 is a circuit diagram of another conventional example using a parabolic waveform output IC. Ql...Transistor for parabolic amplification, Q2゜Q3...Transistor for parabolic output, R1. R2, CI...Integrator circuit.

Claims (1)

[Claims] A pincushion distortion correction device in which a sawtooth voltage obtained by a vertical oscillation circuit of a vertical deflection circuit is applied to a left and right pincushion distortion correction circuit through an integrating circuit.