JP2000057971A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection toke capable of adjusting the position of a screw core even from an opening part on the side closed by a stopper. SOLUTION: A differential coil 13 and a variable inductance coil 16 have cylindrical hollow parts 13a1, 16a1 and screw cores are mounted in the hollow parts 13a1, 16a1. Stoppers 25 for preventing falling-off of the screw cores are installed near the end parts of the hollow parts 13a1, 16a1. As the stoppers 25 have flexibility in the roughly perpendicular direction to the moving direction of the screw cores, the stoppers 25 move away, when a driver is inserted into the hollow parts 13a1, 16a1. Therefore, the stoppers 25 do not become obstacles to position adjustment of the screw cores.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cathode ray tube (CR)
T) According to a deflection yoke used in a display device,
In particular, the present invention relates to a deflection yoke that can prevent a core mounted on a correction coil for correcting misconvergence from falling off and can easily adjust the position of the core.

[0002]

2. Description of the Related Art In recent years, in a CRT display device represented by an information device such as a computer and a television receiver, the definition has been further advanced, and a deflection yoke used in the CRT display device has become increasingly more precise. Deflecting characteristics are required. One of the deflection characteristics is a convergence characteristic, and the deflection yoke generally includes a differential coil as one of correction coils for correcting misconvergence.

Here, an example of a conventional differential coil will be described with reference to FIG. In FIG. 7, the differential coil 13
Is a bobbin 13a having a cylindrical hollow portion 13a1, a core 13b (hereinafter referred to as a screw core 13b) having a screw formed on the outer peripheral surface and mounted in the bobbin 13a, and a pair wound around the bobbin 13a. And the coil 13c.

At the longitudinal end of the differential coil 13 (bobbin 13a), an elastic claw 13d is provided by integral molding. The differential coil 13 is attached to the deflection yoke separator by engaging the claw 13d with a differential coil holding portion 50 provided on the deflection yoke separator. The differential coil 13 may be mounted on a substrate mounted on a deflection yoke.

Further, a tongue-shaped stopper 51 for preventing the screw core 13b from falling off from the hollow portion 13a1 is formed in the differential coil holding portion 50 by integral molding with the differential coil holding portion 50. The stopper 51 is provided in the cavity 13
By closing one opening of a1, the screw core 13b
To prevent falling off. The hollow portion 13 of the screw core 13b
The position adjustment within a1 is performed by inserting a driver into the cavity 13a1 from the right side in the figure where the stopper 51 is not provided.

The mechanism for preventing the differential coil 13 and the screw core 13b from falling off as described above is disclosed in Japanese Patent Application Laid-Open No. H5-21017.
It corresponds to what is described in the gazette.

[0007]

In the conventional deflection yoke described above, the driver for adjusting the position of the screw core 13b can be inserted only from the opening not closed by the stopper 51 in the cavity 13a1. Therefore, the adjustment work of the differential coil 13 must be restricted.

In addition, IT for mounting a deflection yoke on a CRT
Depending on a request from a C (Integrated Tube Component) maker, it may be necessary to form the stopper 51 so as to close the opening on the right side of the cavity 13a1 in the figure, contrary to FIG. In this case, since one type of deflection yoke cannot meet various requests from the ITC manufacturer (ie, various usage situations of the deflection yoke), the stopper 5
Two types of deflection yokes having different positions 1 must be manufactured, which leads to an increase in cost.

Further, in the configuration of FIG. 7, unless the stopper 51 is formed as a separate component, the opening of the cavity 13a1 on the side where the driver is inserted cannot be closed. In a configuration in which only one of the openings of the cavity 13a1 is closed by the stopper 51, the screw core 13b cannot be prevented from dropping from the opening not closed by the stopper 51 of the cavity 13a1.

[0010] The present invention has been made in view of such a problem, and the position of the screw core can be adjusted from the opening closed by the stopper. Well prevent falling off,
It is another object of the present invention to provide a deflection yoke capable of coping with various use situations with one configuration.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a cylindrical hollow portion (13a).
A coil (13c, 16c) is wound around a bobbin (13a, 16a) having a core (1a, 16a1).
3b, 16b), and a deflection yoke provided with a correction coil for adjusting the magnetic field characteristics by moving the position of the core in the cavity, in the vicinity of the end of the cavity, the direction of movement of the core. A stopper (25) which has flexibility in a direction substantially perpendicular to the opening and closes at least a part of an opening which is an end of the cavity to prevent the core from dropping out of the cavity. ) Is provided to provide a deflection yoke.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A deflection yoke according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an embodiment of the deflection yoke of the present invention, FIGS. 2 and 3 are enlarged perspective views showing main parts of the deflection yoke of the present invention, and FIGS. FIG. 6 is a view showing another embodiment of the deflection yoke of the present invention. 1 to 6, the same parts as those in FIG. 7 are denoted by the same reference numerals.

In FIG. 1, one (lower side in the figure) of the deflection yoke is made to be a large diameter part and the other (upper side in the figure) is made to be a small diameter by a separator 1 in which a pair of semi-annular ones are combined. It is formed in a funnel shape. The large diameter portion is on the screen (face) side of the CRT, and the small diameter portion is on the neck side.

A pair of saddle-type horizontal deflection coils (not shown) are mounted on the inner surface of the separator 1, and a pair of saddle-type vertical deflection coils 3 are mounted on the outer surface. The vertical deflection coil 3 is electrically insulated and held. A core 4 made of ferrite or the like is mounted on the outer surface of the vertical deflection coil 3.

A plurality of flanges (hereinafter, referred to as neck-side flanges) 1a are provided on the neck side of the separator 1, and a flange (hereinafter, referred to as face-side flange) 1b is provided on the face side. I have.

Further, a bobbin holder 24 on which the differential coil 13 and the variable inductance coil 16 are mounted is mounted on the side surface of the deflection yoke. Differential coil 13
Has the same basic structure as that described with reference to FIG. 7, and has a cylindrical hollow portion 1 formed of an insulating material such as plastic resin.
A bobbin 13a provided with a bobbin 3a1 and a screw core 13b having a screw formed on the outer peripheral surface and mounted in the bobbin 13a (FIG. 2)
And a pair of coils 13 wound around the bobbin 13a.
c. For example, a hexagonal penetrating or non-penetrating hole 13b1 (see FIG. 2) is formed in the screw core 13b.

Although not shown here, the differential coil 1
3 (bobbin 13a) is provided at its longitudinal end with an elastic claw by integral molding.
Are attached to the bobbin holder 24 by engaging claws with holes formed in the bobbin holder 24.

The differential coil 13 is connected in series between a pair of horizontal deflection coils, and changes the inductance of each of the pair of coils 13c differentially by adjusting the position of the screw core 13b. Then, by adjusting the current flowing through the horizontal deflection coil and adjusting the intensity of the magnetic field generated by the horizontal deflection coil, the XV miss, which is the displacement at which the red and blue lines intersect at the center in the vertical direction of the screen, is obtained. Correct convergence.

On the other hand, the variable inductance coil 16
A red line and a blue line are connected in parallel to a deflection auxiliary coil (not shown) connected in series with the horizontal deflection coil, and the current flowing through the deflection auxiliary coil is adjusted at the left and right ends of the screen in the horizontal direction. Are for correcting XH misconvergence that is shifted in the horizontal direction. Details of the variable inductance coil 16 are described in a prior application by the present applicant, Japanese Patent Application No. 10-201544.

The variable inductance coil 16 comprises a bobbin 16a having a cylindrical hollow portion 16a1 formed of an insulating material such as a plastic resin, and a ferrite or the like having a screw formed on the outer peripheral surface and mounted in the bobbin 16a. The formed core 16b (hereinafter, referred to as a screw core 16b; see FIG. 2) and the coil 1 wound around the bobbin 16a
6c. In the screw core 16b,
For example, a hexagonal penetrating or non-penetrating hole 16b1 (see FIG. 2) is formed.

In this embodiment, the bobbin 16a is
6c is provided with an unwound core holding portion 16a4. Although not shown here, elastic claws are provided at both ends in the longitudinal direction of the bobbin 16a by integral molding. The variable inductance coil 16 engages the claws with holes formed in the bobbin holder 24. Thereby, it is attached to the bobbin holder 24.

Claws 24b1 are formed at both ends on the upper side in the figure of the bobbin holder 24. The claw 24b1 is engaged with the flange 1a, and the claw 24b1 is engaged with the flange 1a. 24
Is fitted to the flange 1a.

Next, the differential coil 1 which is a main part of the present invention will be described.
3 screw core 13b and variable inductance coil 16
FIGS. 2 and 3 show a mechanism for preventing the screw core 16b from falling off.
This will be described in detail with reference to FIG. FIG. 2 shows a state where the differential coil 13 and the variable inductance coil 16 are mounted on the bobbin holder 24, and FIG. 3 shows only the bobbin holder 24. In FIG. 2, for convenience, the coil 1
3c and the coil 16c are omitted.

As shown in FIG. 2 and FIG.
In the vicinity of both ends of the hollow portion 13a1 and the hollow portion 16a1 of the variable inductance coil 16, tongue-shaped stoppers 25 for closing the openings at both ends of the hollow portions 13a1 and 16a1 are formed. As a preferred embodiment, the stopper 25 is provided integrally with the bobbin holder 24.

The stopper 25 has a plate-like portion 25a connected to the bobbin holder 24, and a substantially triangular prism-like portion 25b connected to the plate-like portion 25a and partially closing the openings at both ends of the hollow portions 13a1 and 16a1. Consisting of Since the plate-like portion 25a is thin in a direction orthogonal to the moving direction of the screw cores 13b and 16b, the stopper 25 is provided with the screw cores 13b and 16b.
It has flexibility in the direction orthogonal to the direction of movement of the 16b. Conversely, the stopper 25 hardly bends in the moving direction of the screw cores 13b, 16b.

The triangular prism 25b is provided with a screw core 13b, 1
At a predetermined angle with respect to the direction of movement of the screw cores 13b and 16b, and at a predetermined angle with respect to the direction of movement of the screw cores 13b and 16b, the distance between the differential coil 13 and the variable inductance coil 16 increases. It has an inclined surface 25b2 that is inclined outward in the radial direction.

The operation of the stopper 25 configured as described above will be described with reference to FIGS. FIG.
(A), (B) is a partially broken partial plan view of the differential coil 13, the variable inductance coil 16 and the stopper 25 viewed in a direction parallel to the moving direction of the screw cores 13b, 16b. In FIG. 5, (A) corresponds to FIGS. 4 (A) and (B).
It is a partial plan view of a partially broken view seen from the same direction as
(B) Differential coil 13, variable inductance coil 16
5 is a partial plan view of the differential coil 13, the variable inductance coil 16 and the stopper 25 viewed from the end face side of FIG.

When correcting XV misconvergence or XH misconvergence, as shown in FIGS. 4A and 4B, the differential coil 13 and the variable inductance coil 1 are used.
6 holes 13b1,1 of the screw cores 13b, 16b mounted on
6b1, the driver 100 is inserted, and the screw cores 13b, 16
The position of b is adjusted to adjust the magnetic field characteristics.

At this time, as shown in FIG. 4A, the triangular prism portion 25b of the stopper 25 is formed by the hollow portions 13a1 and 16a1.
Although the opening at the end is partially closed, as described above, since the stopper 25 has flexibility in the direction orthogonal to the moving direction of the screw cores 13b and 16b, the driver 100 can be shaped like a triangular prism. When it comes into contact with the portion 25b, the stopper 25
As shown in FIG. 4B, the position is displaced from the position shown by the broken line to the position shown by the solid line in the direction of the arrow substantially perpendicular to the moving direction of the screw cores 13b and 16b.

The stopper 25 is inserted into the holes 13b1 and 16b1 of the screw cores 13b and 16b of the driver 100, and
The position adjustment of the screw cores 13b and 16b does not hinder at all. Therefore, as in the conventional case, the cavity 13a
There is no restriction that the stopper 25 is not provided at the end on the side where the driver 100 is inserted in 1 and 16a1. therefore,
According to the present invention, it is possible to adopt a desirable mode in which the stoppers 25 are provided near both ends of the cavities 13a1 and 16a1 to close both openings at the ends of the cavities 13a1 and 16a1.

In this embodiment, since the triangular prism 25b has the inclined surface 25b2, the leftward force of the driver 100 in FIG. 4 moves the triangular prism 25b upward in FIG. It works as a force to make it work. Therefore, the stopper 25 easily escapes in a direction substantially orthogonal to the moving direction of the screw cores 13b and 16b. Even if the inclined surface 25b2 is not provided, the stopper 25 can be released in a direction substantially perpendicular to the moving direction of the screw cores 13b and 16b. However, the stopper 25 can be more easily released by providing the inclined surface 25b2. Face 2
Providing 5b2 is a more preferred embodiment.

Further, as shown in FIGS. 5A and 5B, the triangular prism 25b of the stopper 25 (orthogonal surface 25b1).
Has partially closed the openings at both ends of the hollow portions 13a1 and 16a1, and even if the positions of the screw cores 13b and 16b are shifted and the screw cores 13b and 16b are moved to the ends inside the hollow portions 13a1 and 16a1, As described above, since the stopper 25 has little flexibility in the moving direction of the screw cores 13b, 16b, the screw cores 13b, 16b
It does not fall off from a1 and 16a1. The stopper 25
The screw cores 13b and 16b are prevented from falling off.

In this embodiment, the stopper 25 is
Although the openings at both ends of a1 and 16a1 are partially closed, all the openings may be closed. By closing at least a part of the opening, it is possible to prevent the screw cores 13b and 16b from falling off, and it is sufficient to partially close the opening. Partially closing the opening is more convenient for inserting the driver 100 into the hollow portions 13a1 and 16a1 and adjusting the positions of the screw cores 13b and 16b.

The present invention is not limited to the embodiment described above. As shown in FIG. 6, two stoppers 25 may be provided for each end of the hollow portions 13a1 and 16a1. As described above, the number of the stoppers 25 is
It is not limited to one for each end of 1, 16a1, but may be plural. When a plurality of stoppers 25 are provided, it is not necessary that all of the shapes and sizes of the stoppers 25 be the same.

In this embodiment, as a more preferred embodiment, the stoppers 25 are provided at both ends of the hollow portions 13a1 and 16a1, but only one of them may be provided.

In this embodiment, since the differential coil 13 and the variable inductance coil 16 are mounted on the bobbin holder 24, the stopper 25 is formed on the bobbin holder 24. Differential coil 13 and variable inductance coil 16
If you want to attach the
5 may be formed on the separator 1. That is, the stopper 2
5 may be formed on a correction coil mounting member on which correction coils (the differential coil 13 and the variable inductance coil 16) are mounted.

As in the present embodiment, it is more preferable that the stopper 25 is not formed on the differential coil 13 or the variable inductance coil 16 but is formed on the correction coil mounting member. This means that the screw cores 13b and 16b are
This is because the work is easier if the stoppers 25 do not close the openings at the ends of the cavities 13a1 and 16a1 when first attached to the first and 16a1.

However, in the configuration of the present invention, the stopper 25 is connected to the differential coil 13 or the variable inductance coil 1.
6, the screw cores 13b and 16b are
The stopper 25 may be formed on the differential coil 13 or the variable inductance coil 16 in some cases because it can be inserted into the a1 and 16a1.

The present invention is not limited to the embodiment described above, and can be variously modified without departing from the gist of the present invention.

[0040]

As described above in detail, in the deflection yoke of the present invention, a coil is wound around a bobbin having a cylindrical hollow portion, a core is mounted in the hollow portion, and the position of the core is moved in the hollow portion. In the deflection yoke provided with the correction coil for adjusting the magnetic field characteristics by having the end portion of the cavity close to the end of the cavity, the deflection yoke has flexibility in a direction substantially orthogonal to the moving direction of the core. By closing at least a part of the opening, the stopper is provided to prevent the core from dropping out of the cavity, so that the position of the screw core can also be adjusted from the opening closed by the stopper. It is possible to prevent the screw core from falling off satisfactorily without any restriction on the adjustment work, and it is possible to cope with various use situations with one configuration.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a main part of the present invention.

FIG. 3 is an enlarged perspective view showing a main part of the present invention.

FIG. 4 is a diagram for explaining the operation of the present invention.

FIG. 5 is a diagram for explaining the operation of the present invention.

FIG. 6 is a diagram showing another embodiment of the present invention.

FIG. 7 is a plan view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 separator 1a neck side flange 1b face side flange 3 vertical deflection coil 4 core 13 differential coil (correction coil) 13a, 16a bobbin 13a1, 16a1 cavity 13b, 16b core (screw core) 13b1, 16b1 hole 13c, 16c coil 16 variable Inductance coil (correction coil) 24 Bobbin holder (correction coil mounting member) 25 Stopper 25a Plate portion 25b Triangular prism portion 25b1 Orthogonal surface 25b2 Inclined surface

Claims (4)

[Claims] 1. A correction coil for winding a coil around a bobbin having a cylindrical hollow portion, mounting a core in the hollow portion, and adjusting a magnetic field characteristic by moving a position of the core in the hollow portion. In the deflection yoke, in the vicinity of an end of the hollow portion, the deflection yoke has flexibility in a direction substantially perpendicular to a moving direction of the core, and at least a part of an opening which is an end of the hollow portion is formed. A deflection yoke, comprising a stopper for preventing the core from dropping out of the hollow portion by closing the core. 2. The apparatus according to claim 1, wherein the stopper has a slope inclined at a predetermined angle with respect to a direction of movement of the core toward a radially outer side of the correction coil as the distance from the correction coil increases. Item 2. The deflection yoke according to Item 1. 3. The deflection yoke according to claim 1, wherein the stoppers are provided near both ends of the cavity. 4. The deflection yoke according to claim 1, wherein the stopper is formed integrally with a correction coil mounting member for mounting the correction coil.