JP2002231155A - Deflecting yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent risk of a crossover part of a horizontal deflection coil getting in contact with a neck end part of a cathode-ray tube to be damaged in installing a deflecting yoke onto the cathode-ray tube adopting the horizontal deflection coil having the crossover part on the coil rear end side in a bendless structure. SOLUTION: This deflecting yoke 1 comprises the horizontal deflection coil 2 wound in a saddle form with the crossover part 7 on the coil rear end side extended straight in a yoke center axis direction to form a bendless structure. A coil protective part 10 is provided to cover an inner surface of the crossover part 7 of the bendless structure as integrally formed with a separator 4.

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 cathode ray tube.

[0002]

2. Description of the Related Art Generally, a display device using a cathode ray tube is:
A deflection yoke deflects the electron beam emitted from the electron gun up, down, left, and right. The deflection yoke has a horizontal deflection coil and a vertical deflection coil, and is used by being mounted on a cathode ray tube. The horizontal deflection coil forms a horizontal deflection magnetic field that deflects the electron beam left and right (horizontal direction), and the vertical deflection coil forms a vertical deflection magnetic field that deflects the electron beam up and down (vertical direction).

Meanwhile, display devices such as television receivers and computer displays are required to have higher accuracy in terms of performance, while display panels are becoming flatter. Such high precision and flat face display devices lead to an increase in deflection power consumed by the deflection yoke. Further, with the spread of digital television receivers, higher definition, and an increase in deflection frequency, the deflection power tends to increase. Therefore, how to reduce the deflection power is regarded as important.

One of the techniques for reducing the deflection power is to use a saddle-shaped (saddle-shaped) deflection coil structure in which the rear end side (neck side) of the deflection coil is moved in the direction of the yoke center axis. There is known a technique in which a bendless structure is formed by extending a straight line in a bent shape, and a crossover portion of the bendless structure is arranged along the surface of the cathode ray tube.

FIG. 8 is a half sectional view of a deflection yoke employing a bendless type deflection coil. In the illustrated deflection yoke 30, a horizontal deflection coil 31 is connected to a separator 32.
And the vertical deflection coil 33 is mounted inside the separator 3.
2 is mounted outside. Further, the vertical deflection coil 3
The DY core 34 is mounted on the outer side of 3. The crossover portion 35 on the rear end side of the horizontal deflection coil 31 has a bendless structure extending straight in the yoke center axis direction (Z-axis direction in the drawing). The line portion 36 also has a similar bendless structure.

[0006]

However, when a deflection coil having a bendless structure at the rear end side of the coil is employed, when compared with a known bend-up structure, the crossover part 35 at the rear end side of the coil is adopted. , 36 extend toward the neck end of the cathode ray tube in the direction of the yoke center axis. In addition, since the crossover portions 35 and 36 on the rear end side of the coil become longer, the exposed portion of the coil wire also increases.

For this reason, as shown in FIG.
In the case where the deflection yoke 30 is inserted and mounted from the neck side of the cathode ray tube 7, when the deflection yoke 30 is inserted obliquely with respect to the central axis (indicated by a dashed line) of the cathode ray tube 37, it is inserted into the neck end of the cathode ray tube 37. The crossover portion 35 of the horizontal deflection coil 31 is easily contacted. In particular, since the plurality of stem pins 38 protrude from the neck end of the cathode ray tube 37, there is a possibility that the coil wire constituting the crossover portion 35 may be damaged by contact (rubbing) with the stem pins 38. To avoid coil damage at the crossover 35, the deflection yoke 30
It is necessary to accurately align the center axis of the cathode ray tube 37 with the cathode ray tube 37 by using a tilt correction jig or the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a cathode ray tube in which a deflection coil having a bendless structure at a rear end side of the coil is employed. When installing the deflection yoke,
An object of the present invention is to provide a deflection yoke that can avoid coil damage at a crossover portion without using a deflection yoke inclination correction jig or the like.

[0009]

A deflection yoke according to the present invention is wound in a saddle shape and has a bendless structure in which a crossover portion on the rear end side of the coil extends straight in the direction of the center axis of the yoke. And a coil protection portion for covering the inner surface of the crossover portion of the bendless structure.

In the deflection yoke having the above-described structure, the inner surface of the crossover portion of the bendless structure is covered with the coil protection portion, so that when the deflection yoke is mounted on the cathode ray tube, the crossover portion is protected by the coil protection portion. Therefore, the crossover line does not contact the neck end of the cathode ray tube.

[0011]

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

FIGS. 1A and 1B show a structure of a deflection yoke according to an embodiment of the present invention. FIG. 1A is a plan sectional view, and FIG. 1B is a side sectional view. The illustrated deflection yoke 1 includes a horizontal deflection coil 2, a vertical deflection coil 3, a separator 4, and a DY.
It is provided with a core 5. The horizontal deflection coil 2 is mounted inside the separator 4, and the vertical deflection coil 3 is mounted outside the separator 4. In addition, DY core 5
Are mounted outside the vertical deflection coil 3.

The horizontal deflection coil 2 is wound in a saddle shape in pairs above and below the deflection yoke 1. The horizontal deflection coil 2 forms a magnetic field (horizontal deflection magnetic field) for deflecting the electron beam left and right (horizontally). The vertical deflection coils 3 are wound in a saddle shape in pairs on the left and right sides of the deflection yoke 1. The vertical deflection coil 3 forms a magnetic field (vertical deflection magnetic field) for deflecting the electron beam up and down (vertically). In addition, the horizontal deflection coil 2 and the vertical deflection coil 3 are each wound using a mold (die winding).
To form a saddle-shaped winding.

The separator 4 is made of an insulating material such as a resin, and is generally formed in a trumpet shape having one opening in the direction of the yoke center axis larger than the other. DY
The core 5 is made of a magnetic material such as ferrite, and is formed in a substantially conical cylindrical shape with one opening in the yoke center axis direction (Z-axis direction in the drawing) larger than the other. This DY
The core 5 is mounted so as to cover the deflection coils 2 and 3 in order to enhance the effectiveness of the magnetic field generated by the horizontal deflection coil 2 and the vertical deflection coil 3.

At both ends of the horizontal deflection coil 2, there are formed crossover portions 6, 7 for passing the coil wires constituting the horizontal deflection coil 2 in the circumferential direction. Among them, the crossover portion 6 on the front end side of the coil has a bend-up structure that rises in an arc shape in the radial direction, and the crossover portion 7 on the rear end side of the coil extends straight in the yoke center axis direction. It has a bent bendless structure. Similarly, at both ends of the vertical deflection coil 3, a crossover portion 8 having a bend-up structure and a crossover portion 9 having a bendless structure are formed.

On the other hand, a coil protection portion 10 is integrally formed on the small-diameter opening side (rear end side) of the separator 4. The coil protection portion 10 is formed in a cylindrical shape corresponding to the outer diameter of the neck portion so as to fit into the neck portion of the cathode ray tube. On the outer peripheral side of the coil protection section 10, the crossover section 7
A gap is formed in accordance with the thickness dimension of the horizontal deflection coil 2 into the gap from the center axis direction of the yoke, so that the coil protection portion 10 covers the inner surface of the crossover wire 7. Are located in

The saddle-type horizontal deflection coil 2 has a substantially concave non-winding portion 11 adjacent to the bridging portion 7 having a bendless structure. On the other hand, the coil protection portion 10 of the separator 4 is slightly smaller (by L dimension in FIG. 1) than the boundary portion between the crossover wire portion 7 and the non-winding portion 11 in the yoke center axis direction. It is arranged so as to cover the 11 side.

When the deflection yoke 1 having the above structure is mounted on a cathode ray tube, the inner surface of the bendless structure of the connecting wire 7 is covered with a coil protection portion 10 so that, for example, as shown in FIG. Even when the deflection yoke 1 is slightly inclined when the deflection yoke 1 is inserted from the neck end,
At the rear end side of the deflection yoke 1, the coil protection portion 10 comes into contact with the cathode ray tube side (particularly, the stem pin 22). Thereby, when the deflection yoke 1 is mounted on the cathode ray tube 21, the crossover portion 7 of the horizontal deflection coil 2 is protected by the coil protection portion 10, so that the crossover can be performed without using a deflection yoke inclination correction jig or the like. It is possible to reliably avoid coil damage at the wire portion 7. Further, since the coil protection portion 10 is formed integrally with the separator 4, the number of components and the number of assembly steps do not increase.

Further, by covering the crossover portion 7 of the horizontal deflection coil 2 with the coil protection portion 10, play during assembly when the horizontal deflection coil 2 is mounted inside the separator 4 is prevented, and Holding strength can be increased. Further, the inclination of the deflection yoke 1 can be corrected by fitting the coil protection portion 10 to the outer periphery of the neck of the cathode ray tube 21.

Here, when the inner surface of the crossover portion 7 of the bendless structure is covered with the coil protection portion 10, the coil protection portion 10 may be arranged so as to be substantially flush with the inner peripheral surface of the horizontal deflection coil 2. desirable. Specifically, for example, FIG.
As shown in (A), the inner surface side of the crossover wire portion 7 of the horizontal deflection coil 2 is recessed by the thickness of the coil protection portion 10, and the coil protection portion 10 is fitted and arranged in the recess. In addition, as shown in FIG. 3B, for example, as shown in FIG. 3B, the crossover portion 7 of the horizontal deflection coil 2 is formed in a tapered shape by the thickness of the coil protection portion 10, and corresponding to the tapered portion. The thickness of the coil protection portion 10 is gradually reduced to a tapered shape, and the tapered portions are arranged so as to come into surface contact with each other.

By adopting such a shape and arrangement,
By making the coil protection unit 10 substantially flush with the inner peripheral surface of the horizontal deflection coil 2, the cathode ray tube 21
When the deflection yoke 1 is mounted on the inner surface of the horizontal deflection coil 2, there is no step due to the coil protection unit 10. Therefore, the deflection yoke 1 can be mounted smoothly.

Although the coil protection portion 10 is formed integrally with the separator 4 in this embodiment, a member for protecting the coil may be provided separately from the separator 4. That is, as shown in FIG. 4 (A), the coil protection member 12 is constituted by an independent cylindrical part, and the locking claw 1 for engaging with the separator 4 is formed.
3 is formed integrally with the coil protection member 12. Locking claw 13
Are formed at predetermined pitches in the circumferential direction of the coil protection member 12 (for example, four).

The coil protection member 12 thus configured
Is inserted from the large-diameter opening side of the separator 4 toward the small-diameter opening side, so that the coil protection member 12 is engaged with the separator 4 using the locking claws 13 as shown in FIG. As a result, the inner surface of the crossover portion 7 of the horizontal deflection coil 2 is covered with the coil protection member 12. Therefore, when attaching the deflection yoke to the cathode ray tube,
As described above, it is possible to avoid coil damage in the crossover portion 7.

Incidentally, in FIG. 4, the separator 4
After the horizontal deflection coil 2 is mounted on the coil protection member 1
Although an example is shown in which the horizontal deflection coil 2 is mounted on the separator 4, it is also possible to mount the horizontal deflection coil 2 on the separator 4 after mounting the coil protection member 12 on the separator 4.

FIG. 5 is a view for explaining the configuration of a deflection yoke according to another embodiment of the present invention. Note that, in the present embodiment, the same reference numerals are given to the same components as those described in the above embodiment, and the description will be made.

In FIG. 5, the non-winding portion 11 having a substantially concave shape is formed on the horizontal deflection coil 2 wound in a saddle shape as described above. The concave end surface 11 </ b> A of the non-winding portion 11 is located at a boundary with the crossover 7. On the other hand, the separator 4 to which the horizontal deflection coil 2 is attached has the non-winding portion 11
The hook prevention part 14 is integrally formed in the part corresponding to. The hook prevention part 14 is formed in the thickness direction of the separator 4 by removing a part of the separator 4 into a concave shape at a portion corresponding to the non-winding part 11 of the horizontal deflection coil 2 as shown in FIG. It is formed so as to be elastically deformable. The tip of the hook preventing portion 14 is bent into a hook shape, and the hook portion is arranged so as to protrude toward the inner surface of the separator 4.

In the deflection yoke having such a configuration, when the horizontal deflection coil 2 is mounted inside the separator 4, the horizontal deflection coil 2 is assembled in the direction of the arrow shown in FIG. At this time, the hook preventing portion 14 formed on the separator 4 is elastically deformed outward while being pushed into the crossover portion 7 of the horizontal deflection coil 2, and then returns to the original position again. As a result, the hook prevention portion 14 is fitted to the non-winding portion 11 of the horizontal deflection coil 2 as shown in FIG. In this state, as shown in FIGS. 7A and 7B, the concave end surface 11 of the non-winding portion 11 of the horizontal deflection coil 2 is used.
A is in a state of being covered with the tip (hook portion) of the hook prevention unit 14.

By covering the concave end face 11A of the non-winding portion 11 with the hook preventing portion 14 as described above, when attaching the deflection yoke to the cathode ray tube, the crossover portion 7 at the boundary with the non-winding portion 11 is formed. It is protected by the catch prevention unit 14.
Therefore, the neck end of the cathode ray tube (especially the stem pin)
Is a boundary portion between the crossover wire portion 7 and the non-winding portion 11 (the concave end face 11
A) is not caught. As a result, it is possible to effectively avoid coil damage of the crossover 7 at the boundary with the non-winding portion 11.

Further, by providing the hook preventing portion 14 in combination with the coil protecting portion 10 and the coil protecting member 12 described in the above embodiment, it is possible to more reliably avoid the damage of the crossover portion 7. Become. Coil protection part 1
The combination of 0 and the hook preventing portion 14 can be realized by forming them integrally with the separator 4. In addition, the combination of the coil protection member 12 and the hook preventing portion 14 is such that the hook preventing portion (not shown) is integrally formed at the end of the coil protecting member 12 in addition to forming the hook preventing portion 14 on the separator 4. But it is feasible.

By the way, in this embodiment, since the horizontal deflection coil 2 is assembled inside the separator 4,
Although it is assumed that the separator 4 is of an integral type, the anti-trapping portion 14 has an appropriate elasticity.
Is a split type, the horizontal deflection coil 2 can be mounted while avoiding positional interference with the hook prevention unit 14, so that the hook prevention unit 14 does not need to have elasticity.

In the above embodiment, a substantially conical cylindrical core is used as the DY core 5. However, in order to reduce the deflection power, the shape of the opening on the large diameter side is reduced. The present invention is also applicable to a case where a rectangular core having a substantially rectangular shape is adopted.

[0032]

As described above, according to the present invention, since the inner surface of the crossover portion of the bendless structure is covered with the coil protection portion, when the deflection yoke is mounted on the cathode ray tube, the crossover portion has a coil. Protected by the protection unit. This makes it possible to reliably avoid coil damage at the crossover without using a tilt correction jig or the like for the deflection yoke.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a state in which a deflection yoke is mounted on a cathode ray tube.

FIG. 3 is a diagram showing an application example of the deflection yoke according to the embodiment of the present invention.

FIG. 4 is a view showing a modification of the deflection yoke according to the embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration of a deflection yoke according to another embodiment of the present invention.

FIG. 6 is a diagram showing a main structure of a deflection yoke according to another embodiment of the present invention.

FIG. 7 is a diagram showing a state in which a deflection yoke according to another embodiment of the present invention is mounted on a coil.

FIG. 8 is a half sectional view showing a configuration of a conventional deflection yoke.

FIG. 9 is a view for explaining a problem of a conventional deflection yoke.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Deflection yoke, 2 ... Horizontal deflection coil, 3 ... Vertical deflection coil, 4 ... Separator, 5 ... DY core, 6, 7, 8, 9
… Crossover part, 10… coil protection part, 11… non-winding part, 1
1A: concave end face, 12: coil protection member, 13: locking claw,
14 ... Anchor prevention part

Claims (7)

[Claims] 1. A horizontal deflection coil which is wound in a saddle shape and has a bendless structure in which a crossover portion on the rear end side of the coil extends straight in the yoke center axis direction, and a crossover wire having the bendless structure. And a coil protection portion for covering an inner surface of the deflection yoke. 2. The deflection yoke according to claim 1, wherein the horizontal deflection coil is mounted inside a separator, and the coil protection portion is formed integrally with the separator. 3. The deflection yoke according to claim 1, wherein the coil protection portion is arranged so as to be substantially flush with an inner peripheral surface of the deflection coil. 4. A bendless structure in which the wire is wound in a saddle shape and a crossover portion on the rear end side of the coil extends straight in the direction of the center axis of the yoke, and is adjacent to the crossover portion of the bendless structure. A horizontal deflection coil having a substantially concave non-winding portion at a portion, and a hook preventing portion fitted to the non-winding portion while covering a concave end surface of the non-winding portion. Deflection yoke. 5. The deflection yoke according to claim 4, wherein said horizontal deflection coil is mounted inside a separator, and said hook preventing portion is formed integrally with said separator. 6. A bendless structure in which a wire is wound in a saddle shape and a crossover portion on the rear end side of the coil extends straight in the direction of the center axis of the yoke, and is adjacent to the crossover portion of the bendless structure. A horizontal deflection coil having a substantially concave non-winding portion at a portion; a coil protection portion covering the inner surface of the crossover portion of the bendless structure; and a non-winding portion covering the concave end surface of the non-winding portion. And a hook preventing part fitted to the deflection yoke. 7. The deflection yoke according to claim 6, wherein the horizontal deflection coil is mounted inside a separator, and the coil protection portion and the catch prevention portion are formed integrally with the separator.