JPH1050238A - Deflection device for in-line type color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily correct misconvergence due to a temperature rise in a deflection device, by connecting in series a diode bridge circuit to a horizontal polarizing coil, and connecting in parallel a sub-coil pair via a variable circuit element to the circuit. SOLUTION: A diode bridge circuit 25, composed of diodes 24a-24d, is directly connected to a horizontal deflection coil 21H, and a pair of sub-coil pairs 29a and 29b, wound on the same annular magnetic core and generating a magnetic field having different polarity to a pair of side beams, is connected in parallel to the output terminals 26 and 27 side of the diode bridge circuit 25. When a variable coil 28 is moved in an arrow 35 direction, inductance on the sub-coil pair 29a side is reduced compared with that on the sub-coil pair 29b side, to flow much current to the sub-coil pair 29a. Consequently, the magnetic field, generated from the sub-coil pair 29a and 29b, can be made so that a magnetic field, generated from the sub-coil pair 29a, can occupy a main field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflecting device for an in-line type color picture tube suitable for a high-resolution color display tube, and more particularly to a deflecting device for an in-line type color picture tube for correcting misconvergence of a pair of side beams.

[0002]

2. Description of the Related Art In general, an in-line type color picture tube has an electron gun which emits three electron beams arranged in a line composed of a center beam and a pair of side beams passing on the same horizontal plane, and emitted from the electron gun. By deflecting the three electron beams by the magnetic fields generated by the horizontal and vertical deflection coils of the deflecting device, and horizontally and vertically scanning a phosphor screen including three color phosphor layers that emit blue, green, and red light,
It is formed in a structure for displaying a color image.

In this in-line type color picture tube, the horizontal and vertical deflection magnetic fields generated by the deflecting device are made to be non-uniform magnetic fields, so that the combination of the color picture tube and the deflecting device can be achieved without using a circuit correcting means. Thus, there is a feature having a self-convergence function that three electron beams can be concentrated over the entire screen. That is,
As shown in FIG. 9, the magnetic field 1H generated by the horizontal deflection coil of the deflecting device is applied to a pincushion type, and the magnetic field 1V generated by the vertical deflection coil is applied to a barrel type, as shown in FIG. Accordingly, the convergence of the pair of side beams 2B and 2R can be corrected without an external correction circuit.

[0004] Further, regarding the saddle type horizontal deflection coil, recently, as shown in FIG. 10, a notch 4 is formed inside the mold 3 and a horizontal deflection coil 5H is directly wound into a slot, as shown in FIG. Things are used.

[0005] However, in the case of color display tubes, the horizontal deflection frequency is often increased to 64 kHz, even in 15-inch color picture tubes, in order to increase the resolution. When the horizontal deflection frequency is increased in this way, when mounted on a monitor, the temperature becomes high due to the heat generated by the deflection device itself and the ambient temperature. That is, the temperature rise in the normal monitor is 40 ° C. due to the heat generated by the deflecting device, and 20 ° C. due to the heat generated by the drive circuit arranged in the monitor.
° C, and an outside air temperature of 20 to 40 ° C is added, and the temperature rises to nearly 100 ° C.

Therefore, the tension of the horizontal deflection coil 5 which is slot-wound directly on the mold 3 is loosened due to the above-mentioned temperature rise, and as shown in FIG. The misconvergence XH in the lateral direction of the beam is the red side beam pattern 7R.
Appears as a positive cross pattern on the left and the blue side beam pattern 7B on the right. In addition, once the tension is loosened as described above, even if the deflecting device is at room temperature, it does not return to the original state, and the normal cross pattern appears even with the deflecting device at normal temperature. In addition, after adjusting the mounting position of the deflection device, the color picture tube (ITC
In the case of the tube, it is difficult to perform the correction, which is a major cause of deterioration of the quality of the color picture tube.

The amount of change in misconvergence XH of the pair of side beams in the lateral direction due to this temperature change is, for example, about 0.1 mm in the case of a 15-inch type color picture tube. 0.
Since it is about 3 mm, which is not smaller than the required amount, it is a serious problem.

[0008]

As described above, in the in-line type color picture tube deflecting device, particularly in the case of a color display tube, the temperature rise during operation is large with the increase of the horizontal deflection frequency. On the other hand, in a deflection device in which a horizontal deflection coil is slot-wound directly on the mold, the tension is loosened due to the temperature rise, and the lateral misconvergence XH of the pair of side beams is caused by the red side beam pattern on the left and the blue side beam. It appears as a positive cross pattern with the beam pattern on the right. In addition, the positive cross pattern does not return to the original state even when the deflecting device is at room temperature, and appears in the deflecting device at room temperature. In addition, it is difficult to correct the ITC tube, which is a major cause of deterioration in the quality of the color picture tube.
There is a problem.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to correct misconvergence caused by a rise in the temperature of a deflecting device and improve the convergence characteristics of an in-line type color picture tube.

[0010]

SUMMARY OF THE INVENTION A three-row arrangement of a center beam and a pair of side beams emitted from an electron gun of an in-line type color picture tube passing on the same horizontal plane.
An in-line type color picture tube deflector having a horizontal deflection coil for deflecting an electron beam in a horizontal direction, a diode bridge circuit connected in series to the horizontal deflection coil, and a variable circuit element provided on an output terminal side of the diode bridge circuit And a pair of sub-coil pairs that are connected in parallel via the variable circuit element and generate a magnetic field of opposite polarity to the pair of side beams to correct misconvergence of the pair of side beams. Was.

Further, the pair of sub-coils is wound around the same magnetic core.

Further, a pair of sub-coils are respectively wound around a U-shaped magnetic core.

A pair of sub-coil pairs are wound around four independent magnetic cores.

Further, a correction circuit is provided on the electron gun side of the deflection device.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows an in-line type color picture tube device to which a deflecting device according to one embodiment is mounted. The color picture tube has a panel 10 and an envelope composed of a funnel 11 joined to the panel 10 and a three-color phosphor layer that emits blue, green and red light on the inner surface of the panel 10. A phosphor screen 12 is provided, and a shadow mask 13 is disposed inside the phosphor screen 12 so as to face the phosphor screen 12. On the other hand, in the neck 14 of the funnel 11, a center beam 15G
An electron gun 16 for emitting three electron beams 15B, 15G, 15R arranged in a line composed of a pair of side beams 15B, 15R is arranged. A deflector 18 to be described later is mounted outside the vicinity of the boundary between the large diameter portion 17 and the neck 14 of the funnel 11. Then, the three electron beams 15B, 1 arranged in a row and emitted from the electron gun 16 are arranged.
5G and 15R are deflected by the horizontal and vertical main deflecting magnetic fields generated by the deflecting device 18 so that the phosphor screen 12 is horizontally and vertically deflected.
It is formed in a structure for displaying a color image by performing vertical scanning.

The deflecting device 18 is, as shown in FIG.
A pair of upper and lower saddle-type horizontal deflection coils 21H that are arranged inside the mold 20 and generate a horizontal deflection main magnetic field that deflects the three electron beams in the horizontal direction. It has a pair of left and right saddle-type vertical deflection coils 21V for generating a vertical deflection main magnetic field which deflects in the direction, and a cylindrical core 22 disposed outside the vertical deflection coils 21V so as to cover the vertical deflection coils 21V. Further, in the deflection device 18, the rear end side (electron gun side)
Is provided with correction means 23 for correcting misconvergence of the pair of side beams.

This correction means 23, as shown in FIG.
4 connected in series to the pair of horizontal deflection coils 21H.
A diode bridge circuit 25 composed of a plurality of diodes 24a to 24d, a variable coil 28 (variable circuit element) provided on the output terminals 26 and 27 of the diode bridge circuit 25, and connected in parallel via the variable coil 28. And a pair of sub-coil pairs 29a and 29b for generating magnetic fields having different polarities with respect to the pair of side beams.

That is, the pair of sub-coils 29a
, 29b, the sub-coil pair 29a, when a horizontal deflection current flows between the output terminals 26, 27 of the diode bridge circuit as shown in FIG. 3 (a), with respect to the pair of side beams 15B, 15R. 3 indicated by arrow 30
A magnetic field 31a is generated to move the electron beams 15B, 15G, 15R outward in the arrangement direction. As for the sub-coil pair 29b, as shown in (b), the magnetic field 31b for canceling the magnetic field generated by the sub-coil 29a, that is, the three electron beams 15B and 15G indicated by the arrow 32 with respect to the pair of side beams 15B and 15R. , 15R are wound around the same annular magnetic core 33 so as to generate a magnetic field 31b moving inward in the arrangement direction.

When the deflecting device 18 is configured as described above,
The correcting means 23 provided in the deflecting device 18 can correct the lateral misconvergence XH of the pair of side beams due to the temperature change of the deflecting device shown in FIG.

That is, when the variable coil 28 shown in FIG. 1 is moved in the direction of the arrow 35, the inductance of the subcoil pair 29a becomes smaller than that of the subcoil pair 29b, and more current flows in the subcoil pair 29a than in the subcoil pair 29b. Flows. As a result, these sub coil pairs 29a
, 29b can be made to be mainly the magnetic field generated from the sub-coil pair 29a by adjusting the variable coil 28.

Therefore, when deflecting to the right of the screen, a horizontal deflection current flows in the direction of arrow 36 shown in FIG.
3 is an equivalent circuit shown in FIG. 5A, and a magnetic field 31a indicated by a broken line is generated from the sub-coil pair 29a. The pair of side beams 15B and 15B are generated by the magnetic field 30a.
The three electron beams 15B, 15G, 15 indicated by arrow 30 in R
It exerts a force to move outward in the array direction of R. When deflecting to the right of the screen, a horizontal deflection current flows in the direction opposite to the direction of the arrow 36 shown in FIG.
A magnetic field 31a, also indicated by a broken line, is generated from the sub-coil pair 29a, and the three electron beams 15B,
It exerts a force to move it outward in the arrangement direction of 15G and 15R. As a result, the lateral misconvergence XH of the pair of side beams shown in FIG. 11 can be corrected.

By moving the variable coil 28 shown in FIG. 1 in the direction opposite to the direction of the arrow 35, the red side shown in FIG. Misconvergence in which the beam pattern 7R is on the right and the blue side beam pattern 7B is on the left can also be corrected.

When the variable coil 28 is located at the center, the magnetic fields generated from the respective sub-coil pairs 29a and 29b have the same magnitude and opposite directions, and cancel each other. The correction of the misconvergence XH in the lateral direction of the pair of side beams is not performed.

Next, different structures of the sub-coils will be described.

The sub-coil pair shown in FIG. 7 is formed by winding each coil (only 29a is shown) around a pair of U-shaped magnetic cores 37.
Three electron beams 15B, 15G, 15R at the rear of the deflection device
Are arranged outside the neck 14 in the arrangement direction. Even with such a configuration, the same effects as those of the sub coil of the above embodiment can be obtained.

The sub-coil pair shown in FIG. 8 is obtained by winding each coil (only 29a is shown) around four independent rod-shaped magnetic cores 38.
Is disposed outside the neck 14 at the rear of the deflecting device. Even with such a configuration, the same effects as those of the sub coil of the above embodiment can be obtained.

[0028]

According to the present invention, a diode bridge circuit connected in series to a horizontal deflection coil, a variable circuit element provided on an output terminal side of the diode bridge circuit, and a variable circuit element are connected to an in-line type color picture tube deflector. And a pair of sub-coil pairs for generating a magnetic field of opposite polarity to the pair of side beams and correcting misconvergence of the pair of side beams is provided. When wound around the same magnetic core, a pair of U-shaped magnetic cores, or four independent magnetic cores and further provided with a correction circuit on the electron gun side of the deflecting device, a pair of side beams due to a temperature change of the deflecting device can be formed. The horizontal misconvergence XH can be easily corrected and corrected, and the convergence characteristics of the in-line type color picture tube can be improved. Can.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a correction unit of a deflection device for an in-line type color picture tube according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing a configuration of a sub-coil pair of the correction means, respectively.

FIG. 3A is a perspective view showing a configuration of an in-line type color picture tube deflector according to an embodiment of the present invention, and FIG. 3B is a front view showing a part of the deflector. .

FIG. 4 is a diagram showing a configuration of an in-line type color picture tube device equipped with a deflection device according to an embodiment of the present invention.

FIGS. 5A and 5B are diagrams for explaining the operation of the correction means shown in FIG. 1;

FIG. 6 is a diagram for explaining misconvergence caused by design errors and manufacturing variations of the in-line type color picture tube deflecting device.

FIG. 7 is a diagram showing a different configuration of a correcting means of the in-line type color picture tube deflecting device.

FIG. 8 is a diagram showing still another configuration of the correction means of the in-line type color picture tube deflection device.

FIG. 9 is a diagram showing horizontal and vertical deflection magnetic fields that provide a self-convergence function to the in-line type color picture tube deflection device.

FIG. 10 is a diagram showing a structure of a slot-winding horizontal deflection coil.

FIG. 11 is a diagram for explaining misconvergence caused by a temperature change of the in-line type color picture tube deflector.

[Explanation of symbols]

 15B, 15R ... a pair of side beams 15G ... center beam 16 ... electron gun 18 ... deflection device 21H ... horizontal deflection coil 21V ... horizontal deflection coil 23 ... correction means 24a to 24d ... diode 25 ... diode bridge circuit 28 ... variable coil 29a, 29b ... a pair of coil pairs 33 ... magnetic core 37 ... magnetic core 38 ... magnetic core

Claims (5)

[Claims] 1. An in-line type having a horizontal deflection coil for horizontally deflecting three electron beams arranged in a row composed of a center beam and a pair of side beams, which are emitted from an electron gun of an in-line type color picture tube and pass on the same horizontal plane. In the color picture tube deflecting device, a diode bridge circuit connected in series to the horizontal deflection coil, a variable circuit element provided on an output terminal side of the diode bridge circuit, and a parallel connection via the variable circuit element are provided. A correction means comprising a pair of sub-coil pairs for generating a magnetic field of opposite polarity to the pair of side beams and correcting the misconvergence of the pair of side beams is provided. Deflection device. 2. The deflecting device for an in-line type color picture tube according to claim 1, wherein the pair of sub-coils are wound around the same magnetic core. 3. The deflector for an in-line type color picture tube according to claim 1, wherein each of the pair of sub-coils is wound around a U-shaped magnetic core. 4. The deflector for an in-line type color picture tube according to claim 1, wherein a pair of sub-coil pairs are respectively wound around four independent magnetic cores. 5. The deflecting device for an in-line type color picture tube according to claim 1, wherein the correction circuit is provided on an electron gun side of the deflecting device.