JP2000082421A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke having a structure in which respective ringed compensating magnets are easily arranged and effectively compensate without interference with other components, in a limited space in the tube axis direction. SOLUTION: In a perspective view showing a mounting part of ringed compensating magnets of the deflection yoke, a quadrupole magnet 1 which compensates an R(red) beam and a B(blue) beam which are side beams and a bipolar magnet 2 correcting three beams are respectively loaded as ringed compensating magnets. Convergence yokes 3 generating a quadrupole or hexapole magnetic field and compensating characteristics, such as convergence are equipped. The compensating magnets 1, 2 are positioned near a main converging lens of an electron gun so as to more efficiently compensate the electron beams emitted from the electron gun, and they have respectively different diameters, thereby they can be mounted in the same position or in piles, in the tube axis direction. That is, by setting the inside diameter of the compensating magnet 1 larger than the outside diameter of the compensating magnet 2, the compensating magnet 2 can be fitted into the hollow portion of the compensating magnet 1. Thus, it will not take up in the tube axis direction, even if the plural compensating magnets 1, 2 are loaded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke mounted on a television receiver or an image display device using a color cathode-ray tube having an in-line arrangement and having a horizontal deflection coil, a vertical deflection coil, and a main core.

[0002]

2. Description of the Related Art A cathode ray tube (CRT) image display device such as a color television receiver or a video display device has a rear side of a deflection yoke (electron gun side) in order to improve convergence and avoid deterioration of electron beam focus characteristics. ) Are mounted with ring-shaped correction magnets having different magnetizations such as two poles, four poles, and six poles. This compensating magnet magnetizes the magnets of the N pole and S pole at equal positions on the circumference,
A required magnetic field is generated by rotating the magnet to form a pair.

In recent years, in particular, in order to eliminate the focus deterioration due to the halation of the beam spot, the beam aberration is corrected after passing through the focusing lens so that the beam correctly passes through the main focusing lens. Has become.

For this reason, the two poles and four poles are also provided on the deflection yoke side.
Techniques for mounting correction magnets having different numbers of poles, such as poles and six poles, are widely used. Each of these correction magnets has the same diameter, and from its shape,
It is common to arrange them in rows. These known documents include, for example, JP-A-9-63511 and JP-A-9-199053.

However, when a pair of magnets are rotated by providing a plurality of correction magnets having different numbers of poles, a measure is required so that the other magnets do not rotate at the same time. In addition, it is necessary to maintain a certain amount of torque when rotating each correction magnet, and to satisfy these, the structure of the mounting part becomes complicated, and measures such as extending the rear of the deflection yoke and taking measures are necessary. Met.

FIG. 4 is a side view of a ring-shaped correction magnet mounting portion in a conventional deflection yoke. As shown in the figure, the four-pole and two-pole correction magnets 1 and 2 have the same diameter, and are arranged in series on the tube axis.
In addition, a non-magnetic component 10 is required between the correction magnets 1 and 2 in order to prevent rotation of one of the correction magnets or to maintain torque during rotation. Since the thickness of the nonmagnetic component 10 is increased, it is necessary to secure a space for mounting in the tube axis direction.

[0007]

In consideration of its effects and effects, it is best to mount the correction magnet so as to be arranged near the cathode ray tube electron gun, especially near the main focusing lens. However, a convergence correction coil for generating a 4-pole or 6-pole magnetic field is generally mounted on a portion where the correction magnet is disposed.
A plurality of sets may be mounted depending on the correction method and its configuration.

Further, since this part can utilize the leakage magnetic field of the horizontal and vertical deflection coils, in order to satisfy the characteristics, there are not a few cases where the structure is such that each correction component mainly composed of a magnetic material can be mounted. . These components need to be laid out so as not to interfere with each other either mechanically or magnetically. In some cases, it is necessary to extend the rear of the deflection yoke to take measures. Extending the deflection yoke backward is not preferable because it affects the operation of the deflection yoke for correcting the electron beam aberration and the correction magnet of another piece.

In recent years, in order to prevent unnecessary leakage magnetic fields from the deflection yoke, a coil shape in which the fringe portions of the horizontal and vertical deflection coils extend from the vertical direction to the horizontal direction with respect to the conventional tube axis has been adopted. Since the coil is extended rearward, the mounting space for the convergence yoke and the correction magnet is further restricted, and effective correction may be difficult.

An object of the present invention is to provide a structure in which ring-shaped correction magnets can be easily installed in a space limited in the tube axis direction and can be corrected effectively without interference with other parts. To provide an improved deflection yoke.

[0011]

In order to achieve the above object, a first means is mounted on a television receiver or an image display device using an in-line color cathode ray tube, and comprises a horizontal deflection coil and a vertical deflection coil. And a deflection yoke having a main core, a plurality of sets of a pair of ring-shaped correction magnets having different numbers of poles for correcting aberrations of three electron beams emitted from an electron gun of a cathode ray tube, and adjacent ring-shaped correction magnets Are set to be larger than the outside diameter of the other, and each ring-shaped correction magnet is mounted at an equivalent position in the tube axis direction of the cathode ray tube.

In order to achieve the above object, a second means is mounted on a television receiver or an image display device using a color cathode ray tube in an in-line arrangement, and comprises a horizontal deflection coil, a vertical deflection coil, and a main core. With a deflection yoke provided by a cathode ray tube electron gun
A plurality of sets of a pair of ring-shaped correction magnets having different numbers of poles for correcting aberrations of the electron beam are provided, and the inner diameter of one of the adjacent ring-shaped correction magnets is set to be larger than the outer diameter of the other. Are mounted so as to partially overlap in the tube axis direction of the cathode ray tube.

[0013] In order to achieve the above object, the third means is the first or second means, wherein, among the claws for rotating the ring-shaped correction magnet, the inclination of the claw of the inner ring-shaped correction magnet. Is set to be larger than the inclination of the claw of the outer ring-shaped correction magnet.

The ring-shaped correction magnet mounted for the purpose of correcting aberrations of three electron beams emitted from the electron gun of the cathode ray tube or correcting convergence, etc.
In order to arrange it near the main focusing lens formed by the cylindrical electrode of the electron gun, it is generally mounted via a holder behind the deflection yoke.

At this time, each of the correction magnets has a different diameter for each pair, and has such a shape that another pair of correction magnets can be arranged on the inner diameter side of the pair of ring-shaped correction magnets. The pair of outer and inner correction magnets are separately fixed by hooks provided on the holder, thereby improving the interference between the respective correction magnets and the workability during rotation of the magnets.

In addition, when adjusting the rotation of each correction magnet, a rotation holding claw is generally installed on each correction magnet. In order to improve the adjustment workability, the rotation holding claw is a ring. In many cases, the shape correction magnet is mounted at a certain angle in the direction opposite to the deflection yoke.

Even when the correction magnets are superimposed, it is possible to provide an angle to the holding claws in the same manner. By making the diameter larger, the diameter of the outer correction magnet can be made relatively small.

The mounted ring-shaped correction magnets are completely or partially overlapped on the tube axis of the cathode ray tube on the inside and outside, respectively, so that the mounting space in the tube axis direction is reduced by half. Therefore, it is not necessary to extend the deflection yoke backward.

When each correction magnet is arranged in series with respect to the tube axis, when each correction magnet is rotated,
It was necessary to take measures to prevent other compensating magnets from rotating similarly.

In the conventional means, as a countermeasure, non-magnetic parts are mounted between the correction magnets. However, since each correction magnet has a different inside diameter, each correction magnet can be fixed independently. It becomes possible, and there is no need to add such components, the number of components is reduced, and the cost is not increased.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a mounting portion of a deflection yoke according to the present invention for mounting a ring-shaped correction magnet.
As shown in the figure, a quadrupole magnet 1 for correcting R (red) and B (blue) beams as side beams and a dipole magnet 2 for correcting three beams are mounted as ring-shaped correction magnets, respectively. Have been. Further, a convergence yoke 3 for generating a quadrupole or hexapole magnetic field and correcting characteristics such as convergence is provided.

The mounting positions of the correction magnets 1 and 2 are set near the main focusing lens of the electron gun and have different diameters so that the electron beam emitted from the electron gun can be corrected more effectively. , Can be mounted at the same position or in the tube axis direction.

That is, the inner diameter of the correction magnet 1 is
By setting the diameter larger than the outer diameter of the correction magnet 2, the correction magnet 2 can be fitted into the inner space of the correction magnet 1, so that even if a plurality of correction magnets 1 and 2 are mounted, a space is required in the tube axis direction. There is no.

In the example shown in FIG. 1, a four-pole correction magnet 1 is mounted on the outside, and a two-pole correction magnet 2 is mounted on the inside. Since the correction magnet 1 mounted on the outside has a certain distance to the electron beam, a correction amount equivalent to the conventional amount can be secured by increasing the amount of magnetization and increasing the magnetic force.

The correction magnets 1 and 2 are independently fixed by fixing hooks 4 and 5 provided on a holder for a molded component or the like. This solves the problem that when one of the correction magnet pairs, for example, the four-pole correction magnet 1 is rotationally corrected, the other correction magnets having different magnetic poles, for example, the two-pole correction magnet 2 are simultaneously rotated. .
The fixing hooks 4 and 5 may be arranged at different positions such as up, down, left and right in consideration of injection molding of the holder as a molded part. The correction magnet 1 has pawls 6 and 7 for holding the rotation at opposing locations on the outer periphery thereof, and the correction magnet 2 similarly has pawls 8 and 9.

FIG. 2 is a side view showing a mounting portion of the deflection yoke according to the first embodiment of the present invention for mounting the ring-shaped correction magnet. The first embodiment shows an example in which the correction magnets 1 and 2 are arranged at the same position with respect to the tube axis. That is, in this example, the correction magnet 2 completely enters the inner space of the correction magnet 1, and even if a plurality of correction magnets are provided, only one set of thickness is required.

FIG. 3 is a side view showing a mounting portion of a deflection yoke according to a second embodiment of the present invention, to which a ring-shaped correction magnet is attached. In the second embodiment, the correction magnets 1, 2
Shows an example in which the parts are mounted so as to overlap with each other at a certain position with respect to the pipe shaft. That is, in this example, the correction magnet 2 does not completely enter the inner space of the correction magnet 1 but partially overlaps. Therefore,
The space in the pipe axis direction can be omitted by the overlap.

In FIGS. 2 and 3, the ring-shaped correction magnets 1 and 2 are magnetized with equal amounts of N-pole and S-pole magnets at circumferential positions, and a pair of two superposed magnets is used. A required magnetic field is generated by rotating one or two sheets at a time.

When the magnet is rotated, it is common to provide a claw 6, 7 or 8, 9 for holding the rotation in consideration of workability and the like. 7
Alternatively, there is a case where the angles 8 and 9 are provided at a certain angle with respect to the circumferential surfaces of the correction magnets 1 and 2 and a case where the tip shapes of the claws 6 to 9 are considered in order to make it easy to grasp. . In the first and second embodiments shown in FIGS.
Is provided with a certain angle. In this case, the angles of the claws 6 and 7 of the outer correction magnet 1 are set to be smaller than those of the claws 8 and 9 of the inner correction magnet 2 so that when the correction magnets 1 and 2 are rotated, they interfere with each other. The problem of doing so is also solved. When the correction magnets 1 and 2 are incorporated in the holder, the outer correction magnet 1 may be attached first.

As described above, the first,
By providing the mounting structure of the correction magnets 1 and 2 as in the second embodiment, the space in the tube axis direction, which was conventionally required, can be minimized, and the design of other components and the structure for installing them Is given a margin. Therefore, it is not necessary to take measures such as extending the rear of the deflection yoke to mount the correction magnets 1 and 2.

Since the diameters of the correction magnets 1 and 2 are different, the correction magnets 1 and 2 can be fixed independently. Further, each of the correction magnets 1 and 2 can be held without using the non-magnetic component 10 which is necessary for preventing rotation of other correction magnets and maintaining torque during rotation. Therefore, the number of components is reduced, and a more inexpensive deflection yoke can be provided.

[0032]

According to the first aspect of the present invention, when a plurality of ring-shaped correction magnets having different numbers of poles are mounted on a plurality of deflection yokes, only the thickness of a pair of correction magnets needs to be secured. Since the mounting space behind the yoke can be effectively used, a design margin for mounting other components such as a convergence yoke in this space is secured. Further, the same function as that of the related art can be obtained without adding a non-magnetic material component to be inserted between the correction magnets, which is required in the related art. As a result, the number of components can be reduced, and an inexpensive deflection yoke can be provided.

According to the second aspect of the present invention, since a plurality of correction magnets enter each other and partially overlap each other, the mounting space behind the deflection yoke is widened, so that the same effect as described above is exerted.

According to the third aspect of the present invention, among the claws for rotating the ring-shaped correction magnet, the inclination of the inner ring-shaped correction magnet is greater than the inclination of the outer ring-shaped correction magnet. Since it is set, the diameter of the outer correction magnet can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an attachment portion of a deflection yoke of a deflection yoke according to the present invention.

FIG. 2 is a side view showing a mounting portion of the deflection yoke according to the first embodiment of the present invention, to which a ring-shaped correction magnet is attached;

FIG. 3 is a side view showing a mounting portion of a deflection yoke according to a second embodiment of the present invention, to which a ring-shaped correction magnet is attached;

FIG. 4 is a side view showing a mounting portion of a conventional deflection yoke for a ring-shaped correction magnet.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ring-shaped four-pole correction magnet 2 ring-shaped two-pole correction magnet 3 convergence yoke 4, 5 hook for fixing correction magnet 6 to 9 claw 10 nonmagnetic material part

Claims (3)

[Claims] 1. A deflection yoke which is mounted on a television receiver or an image display device using a color cathode ray tube having an in-line arrangement and has a horizontal deflection coil, a vertical deflection coil, and a main core, emits light from an electron gun of the cathode ray tube. A plurality of sets of a pair of ring-shaped correction magnets having different numbers of poles for correcting aberrations of three electron beams are provided, and the inner diameter of one of the adjacent ring-shaped correction magnets is made larger than the outer diameter of the other. A deflection yoke, wherein the correction magnet is mounted at a position substantially equivalent to the tube axis direction of the cathode ray tube. 2. A deflection yoke which is mounted on a television receiver or an image display device using a color cathode ray tube having an in-line arrangement and has a horizontal deflection coil, a vertical deflection coil, and a main core, emits light from the electron gun of the cathode ray tube. A plurality of sets of a pair of ring-shaped correction magnets having different numbers of poles for correcting aberrations of three electron beams are provided, and the inner diameter of one of the adjacent ring-shaped correction magnets is made larger than the outer diameter of the other. A deflection yoke, wherein the correction magnet is mounted so as to partially overlap the tube axis direction of the cathode ray tube. 3. The method according to claim 1, wherein
A deflection yoke characterized in that, among the claws for rotating the ring-shaped correction magnet, the gradient of the claws of the inner ring-shaped correction magnet is made larger than the gradient of the claws of the outer ring-shaped correction magnet.