JPH10241603A - Convergence adjusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a delicate convergence adjustment in a tube surface peripheral part by a method, wherein a convergence correction piece made of ferrite rubber with small possibility of heat generation is united to a plastic substrate and the plastic substrate is held slidably on a separator of a deflection yoke. SOLUTION: A convergence correction piece 28 made of ferrite rubber which poses no concern for heat generation due to an eddy current, which is united to a plastic substrate 29 is used as a convergence correction member 27 for adjusting the magnetic field distribution of a deflection magnetic field. Further, the plastic substrate 29 is held on guide parts 26v, 26h provided on a separator 26 of a deflection yoke 23, so as to be able to come close to or go away from a tube axis, whereby a delicate convergence adjustment in a tube surface peripheral part of a cathode ray tube 22 is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a convergence adjusting apparatus for adjusting convergence by distorting a magnetic field distribution of a deflection magnetic field of a deflection yoke used mainly for a multi-sync monitor or the like.

[0002]

2. Description of the Related Art A monitor receiver 1 shown in FIG. 1 is a multi-sync monitor capable of switching a deflection frequency corresponding to a plurality of horizontal synchronization frequencies, and has a neck portion of a cathode ray tube (CRT) 2 as a display device. A deflection yoke 3 for deflecting the electron beam is assembled, and a convergence purity magnet 4 for correcting a position shift of the electron beam is assembled near the electron gun. The deflection yoke 3 is formed by winding a toroidal coil around a ferrite core whose front and rear ends are partitioned by separators 5 and 6, and is supplied with a sawtooth-like horizontal deflection current and a vertical deflection current from a deflection circuit (not shown). A deflection magnetic field is generated to deflect the electron beam emitted from the electron gun in the horizontal and vertical directions. The convergence purity magnet 4
It can rotate around the tube axis of the cathode ray tube 2,
By adjusting the rotation position, a deviation due to a positional deviation of the electron gun of the cathode ray tube 2, a deviation due to an axial deviation of the toroidal coil of the deflection yoke 3, or a focusing deviation of each of the R, G, B electron beams due to geomagnetism is corrected. It has become.

At the time of convergence adjustment, first,
The convergence purity magnet 4 is rotated to change the direction of the magnetic field, and the R, G, and B emitted from the electron gun are emitted.
Are moved in the horizontal direction or the vertical direction on the entire screen, and convergence adjustment is performed so that the electron beams are focused on the central portion of the cathode ray tube 2. Next, as shown in FIG. 6, a convergence correction iron piece 7 is assembled to the separator 6 at the rear end of the deflection yoke 3 to correct misconvergence in the peripheral portion of the tube surface, and the deflection applied to the R, G, B electron beams is performed. The magnetic field distribution of the deflecting magnetic field is distorted so that the biasing force becomes uniform. Misconvergence at the periphery of the tube surface is caused by the difference in the force applied to the R, G, and B electron beams due to the density of the magnetic field distribution of the deflecting magnetic field. Therefore, suppressing the amount of misconvergence at the periphery of the tube surface is an extremely important key in improving image quality.

The convergence correction iron piece 7 is shown in FIGS.
As shown in (1), the deflection yoke 3 is slidably held by a vertical guide portion 6v and a horizontal guide portion 6h which are formed integrally with the separator 6 at the rear end of the deflection yoke 3 vertically and horizontally. The vertical guide part 6v is also a horizontal guide part 6h.
Also, a pair of rail members 8 having an F-shaped cross section with guide grooves 8a and 8b provided in two upper and lower stages are arranged in parallel and spaced apart from each other by the width of the convergence correction iron piece 7. Upper guide groove 8a or lower guide groove 8b
The convergence correction iron piece 7 is slidably held in such a manner as to be sandwiched by one or both of them. For this reason, the magnetic flux passing through the convergence correction iron piece 7 can be increased or decreased by adjusting the holding position of the convergence correction iron piece 7 toward or away from the tube axis of the cathode ray tube 2. As a result, the magnetic field distribution of the deflecting magnetic field is distorted in accordance with the increase and decrease of the magnetic flux, and the force of the deflecting magnetic field on each of the R, G, and B electron beams emitted from the electron gun of the cathode ray tube 2 is changed, Misconvergence is corrected.

[0005]

The conventional convergence adjusting device 9 comprises a convergence correcting iron piece 7 for adjusting the magnetic field distribution of the deflecting magnetic field sandwiched between rail members 8 formed on the separator 6. There is
Especially when applied to a multi-sync monitor having a considerably high horizontal scanning frequency in the high resolution mode, eddy current is easily generated in the convergence correction iron piece 7, and the convergence correction iron piece 7 is likely to be a heat source due to the eddy current. There is a problem in that overheating exceeding the limit is caused or the holding position of the convergence correction iron piece 7 with respect to the separator 6 is likely to be deviated.

Therefore, in order to suppress heat generation due to eddy current,
For example, the convergence adjusting device 10 shown in FIGS.
As described above, a plan to use a convergence correction rubber piece 11 made of a ferrite rubber obtained by processing a soft ferrite rubber instead of the convergence correction iron piece 7 has been studied. However, the soft ferrite rubber is difficult to process, and unless a certain thickness is secured, a correction effect comparable to that of the convergence correction iron piece 7 cannot be obtained. Therefore, it is necessary to use the convergence correction rubber piece 11 having a large thickness as shown in the figure. was there. For this reason, the existing guide portions 6v and 6h formed integrally with the separator 6 cannot be diverted for the convergence correction rubber piece 11, and the rail-shaped guide portions 12v and 6v are adapted to the thick convergence correction rubber piece 11. There was a problem that a separator 12 having 12h had to be newly prepared.
In addition, the convergence correction rubber piece 11 does not have the structural strength of the convergence correction iron piece 7 and has a remarkable rigidity characteristic of soft rubber.
However, it is difficult to precisely and reliably adjust the holding position of the convergence correction rubber piece 11 with respect to the tube axis, and it is difficult to finely adjust the convergence around the tube surface.

The present invention has solved the above-mentioned problems. In this invention, a convergence correction piece made of ferrite rubber, which is less likely to generate heat, is combined with a plastic substrate, and the plastic substrate is slidably held by a separator of a deflection yoke. It is an object of the present invention to provide a convergence adjustment device that enables fine convergence adjustment of a peripheral portion of a tube surface.

[0008]

In order to achieve the above object, the present invention combines a separator provided at the shaft end of a deflection yoke attached to a cathode ray tube and a convergence correction piece made of ferrite rubber on a plastic substrate. And
A convergence correcting member for slidably holding the plastic substrate with respect to the separator.

The separator has a pair of guides along two orthogonal axes on a plane substantially orthogonal to the axis of the cathode ray tube. The convergence correction member is configured such that the plastic substrate is formed of an axis of the cathode ray tube. The guide is held by the guide portion in a state in which the guide can be slid freely in a direction of approaching and separating from the guide.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view showing an embodiment of a cathode ray tube to which a convergence adjusting device of the present invention is applied, FIG. 2 is an enlarged cross-sectional view taken along line II-II of FIG.
FIG. 3 is a perspective view of a main part of the convergence adjusting device shown in FIG. 1, and FIG. 4 is an exploded perspective view of the convergence adjusting device shown in FIG.

A convergence adjusting device 21 shown in FIG.
Is composed of a separator 26 disposed at the rear end of the axis of the deflection yoke 23 attached to the cathode ray tube 22, and a convergence correction member 27 slidably held by the separator 26. Reference numeral 24 denotes a convergence purity magnet, and reference numeral 25 denotes a separator disposed at the front end of the deflection yoke 23. The convergence correction member 27 is a convergence correction piece 2 made of ferrite rubber.
8 is fixedly bonded to a plastic substrate 29 by bonding or the like. The plastic substrate 29 has the same size and shape as the conventional convergence correction iron piece 7, and therefore, the separator 26 having the same shape as that of the conventional convergence correction iron piece 7 can be used as it is.

The separator 26 has a pair of guide portions 26v and 26h along two orthogonal axes on a plane substantially orthogonal to the axis of the cathode ray tube 22, and the convergence correction member 27 is attached to these guide portions 26v and 26h. It is slidably held. The vertical guide part 26v is also the horizontal guide part 2.
6h also includes a pair of rail members 8 having an F-shaped cross-section in which guide grooves 8a and 8b are formed in two upper and lower stages, and are spaced apart from each other by the width of the plastic substrate 29 to face each other. The convergence correction member 27 is assembled to the separator 26 so as to be sandwiched between the members 8.
That is, the convergence correction member 27 is held by the guide portion 26v or 26h in a state in which the plastic substrate 29 can be slid freely in a direction approaching or separating from the axis of the cathode ray tube 22.

As described above, the convergence adjusting device 2
Reference numeral 1 denotes a plastic substrate 29 in which a convergence correction piece 28 made of ferrite rubber is combined with a plastic substrate 29 as a means for adjusting the magnetic field distribution of the deflection magnetic field.
9 is held by guide portions 26v and 26h provided on the separator 26 of the deflection yoke 23 so as to be able to approach and separate from the tube axis. Since the convergence correction piece 28 made of ferrite rubber hardly generates an eddy current with respect to a high-frequency deflection current, heat generation can be suppressed. It is suitable for.

When compared with the convergence correcting iron piece 7, the convergence correcting piece 2 made of ferrite rubber is used.
8 requires a plastic substrate 29
Can be mounted on the separator 26 with high accuracy as long as it is processed in accordance with the dimensions and shapes of the guide portions 26v and 26h.
The low workability of the substrate itself does not pose a problem, and the plastic substrate 29 has a sufficient structural strength as compared with the convergence correction piece 28 made of ferrite.
6v, 26h, the sliding position can be easily adjusted, and the holding position of the convergence correction piece 28 with respect to the tube axis of the cathode ray tube 22 is adjusted to be close or apart,
By increasing or decreasing the magnetic flux passing through the convergence correction piece 28, it is possible to finely adjust the convergence around the tube surface.

The separator 26 has a pair of guide portions 26v and 26h along two orthogonal axes on a plane substantially orthogonal to the axis of the cathode ray tube 22, and the convergence correction member 27 is a plastic substrate 29 formed of a cathode ray tube. 2
Since the guide portions 26v and 26h are slidably moved in the direction of approaching and separating from the second axis line, the convergence correction member 27 attached to the horizontal guide portion 26v or the vertical guide portion 26h can be attached at a position, for example. By performing the adjustment, it is easy to finely adjust the convergence at the periphery of the cathode ray tube 22.

In the above-described embodiment, a lock mechanism (not shown) for locking the holding position of the convergence correction member 27 is provided on the guide portions 26v and 26h of the separator 26, and the convergence correction member 27 with respect to the guide portions 26v and 26h is provided. It is also possible to lock the holding position.

[0017]

As described above, according to the convergence adjusting apparatus of the present invention, as a means for adjusting the magnetic field distribution of the deflecting magnetic field, a convergence correction piece made of ferrite rubber is used. The guide portion provided on the separator of the deflection yoke is configured to be held close to and away from the tube axis, so that the convergence correction piece made of ferrite rubber generates almost no eddy current even for high-frequency deflection current.
Heat generation can be suppressed, and therefore it is suitable for a multi-sync monitor or the like that supports a plurality of deflection frequencies including a high resolution mode.Also, even when a wall thickness is required compared to a convergence correction iron piece, a plastic substrate can be used. As long as it is processed according to the dimensions and shape of the guide part, it can be mounted on the separator with high accuracy, so the low workability of the ferrite rubber convergence correction piece itself does not matter, and the plastic substrate is ferrite. Since it has sufficient structural strength compared to the convergence correction piece made of, it is easy to adjust the sliding position even when sliding with respect to the guide part, and the holding position of the convergence correction piece with respect to the tube axis of the cathode ray tube is close to or By adjusting the separation and increasing or decreasing the magnetic flux passing through the convergence correction piece, Excellent effects etc. are possible strange convergence adjustment.

Further, the separator has a pair of guide portions along two orthogonal axes on a plane substantially orthogonal to the axis of the cathode ray tube.
Since the plastic substrate is held by the guide portion in a state in which the plastic substrate can freely slide in a direction approaching and separating from the axis of the cathode ray tube, for example, a mounting position of a convergence correction member mounted on a horizontal guide portion or a vertical guide portion By adjusting, there is an effect such as that delicate convergence adjustment in the peripheral portion of the tube surface of the cathode ray tube is easy.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment of a cathode ray tube to which a convergence adjusting device of the present invention is applied.

FIG. 2 is an enlarged cross-sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of a main part of the convergence adjusting device shown in FIG. 1;

4 is an exploded perspective view of the convergence adjusting device shown in FIG.

FIG. 5 is a schematic side view showing an example of a cathode ray tube to which a conventional convergence adjusting device is applied.

6 is an enlarged cross-sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a perspective view of a main part of the convergence adjustment device shown in FIG. 5;

8 is an exploded perspective view of the convergence adjusting device shown in FIG.

FIG. 9 is a perspective view of a main part showing a modification of the conventional convergence adjusting device.

10 is an exploded perspective view of the convergence adjustment device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Convergence adjustment device 22 Cathode ray tube 23 Deflection yoke 24 Convergence purity magnet 25, 26 Separator 26v Vertical guide part 26h Horizontal guide part 27 Convergence correction member 28 Convergence correction piece made of ferrite rubber 29 Plastic substrate

Claims (2)

[Claims] A separator disposed at an axial end of a deflection yoke attached to a cathode ray tube and a convergence correction piece made of ferrite rubber are combined with a plastic substrate;
A convergence adjusting device, comprising: a convergence correction member that slidably holds the plastic substrate with respect to the separator. 2. The separator has a pair of guide portions along two orthogonal axes on a plane substantially orthogonal to the axis of the cathode ray tube, and the convergence correction member includes:
2. The convergence adjusting device according to claim 1, wherein the plastic substrate is held by the guide portion in a state in which the plastic substrate can freely slide in a direction approaching and separating from an axis of the cathode ray tube.