JPH0546376Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an S-curve correction device that improves horizontal linearity in television receivers, CRT displays, and the like.

2. Description of the Related Art Generally, as shown in FIG. 6, such a circuit connects an S-shaped capacitor 2 of an appropriate capacitance in series with a horizontal deflection coil 1, and connects the horizontal deflection coil 1 between both ends of the S-shaped capacitor 2. S-shaped correction is performed by generating a parabolic waveform based on series resonance between the inductance and the capacitance of the capacitor 2.
In FIG. 6, Q ₁ is a horizontal output transistor, D ₁ is a damper diode, C ₁ is a resonant capacitor, 3 is a flyback transformer, and 4 is a DC power supply.

Problems to be Solved by the Invention However, in the conventional method using an S-shaped capacitor, the parabolic waveform for S-shaped correction control is generated by resonance between the S-shaped capacitor and the horizontal deflection coil. There is less freedom to change. This is because, for example, the inductance value of a horizontal deflection coil is determined from the viewpoint of deflection ability. Therefore, in the conventional example, there is a drawback that it is difficult to obtain a sufficiently desirable waveform.

The present invention was made in view of these points, and
S that allows for a higher degree of freedom in parabolic waveforms
The purpose of this invention is to provide a character correction device.

Means for Solving the Problems In order to achieve the above object, the S-shaped correction device of the present invention connects the controlled winding of a saturable reactor to a horizontal deflection coil, and connects the control winding of the saturable reactor with a vertical period. The configuration is such that the parabolic waveform current with a horizontal period and the parabolic waveform current with a horizontal period are added in a superimposed manner.

Effect According to such a configuration, the inductance of the controlled winding connected to the horizontal deflection coil changes, making the waveform of the horizontal deflection current parabolic in the vertical period, correcting left and right pincushion distortion, and correcting the left and right pincushion distortion in the horizontal period. The horizontal sawtooth shape with character correction provides good horizontal straightness. That is, the left and right pincushion distortion and horizontal linearity can be improved by using one saturable reactor. Moreover, since the horizontally periodic parabolic waveform current applied to the control winding can be formed separately from the horizontal deflection coil, the degree of freedom in setting the waveform is increased.

Embodiment In FIG. 1, in which the present invention is implemented, the same parts as in FIG. 6 are given the same reference numerals, and redundant explanation will be omitted. In this embodiment, a saturable reactor 5 is connected to the horizontal deflection coil 1, and an S-shaped correction capacitor 2 is inserted between the saturable reactor 5 and the ground, although it is not necessarily required. This saturable reactor 5
Although it is not necessary to be limited to this, the first and second controlled windings 10a and 10b are wound around both end branches 7 and 8 of the core 6 having a diagonal shape, and one end of the horizontal deflection coil 1 and It is connected in series with the S-shaped capacitor 2. A control winding 11 is wound around the central branch 9 .
One end of this control winding 11 is connected to a terminal 12,
The other end is grounded. The central branch 9 of the core 6 is thinner than both end branches 10a, 10b, and is more likely to cause magnetic saturation. The configuration shown in FIG. 1 is similar to a left and right pincushion distortion correction circuit conventionally used in a horizontal deflection circuit, but the configuration of this embodiment is significantly different from that in the signal applied to the terminal 12. That is, in the conventional left/right pincushion distortion correction circuit, a parabolic waveform current with a vertical period is simply added, but in this embodiment, as shown in FIG. 14 is applied.

Figure 3 shows the parabolic waveform current 14 of the horizontal period.
By applying such a parabolic waveform current 14 to the control winding 11, the inductance of the first and second controlled windings 10a and 10b can be changed as shown in FIG. let still,
FIG. 4 shows one horizontal period, with the vertical axis showing the inductance L and the horizontal axis showing the screen position.

The horizontal deflection current _IDY is generated by the first and second controlled windings 10a, 10 having such inductance characteristics.
Under the effect of b, the solid line waveform 15 in FIG. 5 is corrected to the dotted line waveform 16, thereby achieving good horizontal linearity on the screen. Regarding S-shaped correction, only the parabolic waveform current 14 with a horizontal period is supplied to the control winding 11 of the saturable reactor 5,
Although it is not necessary to provide the vertically periodic parabolic waveform current 13, by inputting both, it is possible to enjoy the advantage that S-curve correction and right-left pincushion distortion correction can be achieved with one saturable reactor 5. In other words, the S-shaped correction can be achieved by using a conventional pincushion distortion correction device, and a new saturable reactor is not required for the S-shaped correction.

Effects of the invention According to the invention, the S-shaped correction of the horizontal deflection current is determined by the horizontally periodic parabolic waveform current applied to the control winding of the saturable reactor, and the parabolic waveform current is formed independently of the horizontal deflection coil. Therefore, the degree of freedom in setting the parabolic waveform (therefore, the S-shaped correction waveform) is higher than in the past, and desirable S-shaped correction can be realized. Furthermore, since the saturable reactor is also used as the left and right pincushion distortion correction circuits, there is an effect of reducing the cost of the entire horizontal deflection circuit.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an S-shaped correction device embodying the present invention, and FIGS. 2, 3, 4, and 5 are explanatory diagrams thereof. FIG. 6 is a circuit diagram of a conventional example. DESCRIPTION OF SYMBOLS 1...Horizontal deflection coil, 5...Saturable reactor, 10a...First controlled winding, 10b...Second
Controlled winding, 11... Control winding, 13... Parabolic waveform current with vertical period, 14... Parabolic waveform current with horizontal period.

Claims (1)

[Scope of utility model registration request] A horizontal deflection coil is connected to the controlled winding of a saturable reactor formed by winding a controlled winding and a control winding around the core, and a parabolic waveform current with a vertical period for correcting left and right pincushion distortion is connected to the control winding. An S-shape correction device characterized in that a parabolic waveform current with a horizontal period for S-shape correction is applied in a superimposed manner.