JPH10125258A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fix cores even if the sizes of the cores are changed, avoid their displacement after they are fixed, and improve the positioning accuracy of the cores than before, by inserting wedges between the flange of a separator and the end faces of the cores, and pressing and fixing the cores to the separator. SOLUTION: In this deflection yoke 20, cores 3a, 3b wound with a horizontal deflection coil and a vertical deflection coil are arranged between a flange 22 a on the display screen side of a separator 22 and lugs 24, 25 provided on a flange on the electron gun side, wedges 21 are inserted between the lugs 24, 25 and the cores 3a, 3b, the cores 3a, 3b are temporarily fixed in contact with the flange 22a on the display screen side, and they are permanently fixed by ultrasonic welding after an adjustment. The cores 3a, 3b can be positioned and fixed while preventing a positional drift with higher accuracy as compared with the conventional fixing method by an adhesive, and the hardening time of the adhesive can be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke and can be applied to, for example, a case where a magnet wire is wound around a core to form a vertical deflection coil. The present invention makes it possible to improve the positioning accuracy of the core as compared with the related art by pressing and fixing the core to the separator by a wedge inserted between the flange of the separator made of a coil bobbin and the end face of the core. .

[0002]

2. Description of the Related Art Conventionally, a deflection yoke has a core fixed to a separator by an adhesive.

FIG. 9 is a side view showing a deflection yoke of this type. In the deflection yoke shown in FIG. 9, the description of the vertical deflection coil will be omitted.

In this type of deflection yoke, a magnet wire is wound in a saddle shape to form a horizontal deflection coil, and a substantially conical cylindrical separator 2 is arranged so as to surround the horizontal deflection coil. Further, cores 3 a and 3 b obtained by dividing the substantially conical cylindrical shape are arranged so as to surround the separator 2. The cores 3a and 3b are wound with magnet wires in advance to form vertical deflection coils. Thus, the deflection yoke 1 forms a magnetic circuit of a deflection magnetic field by the cores 3a and 3b, and forms a coil bobbin of a horizontal deflection coil by the separator.

After that, the back cover 6 and the like are arranged on the deflection yoke 1. After adjusting the crosstalk, the adhesive 4 is applied to fix the cores 3 a and 3 b to the separator 2. The deflection yoke 1 is then shipped after adjustment of convergence and the like.

[0006]

However, the core forming the magnetic circuit of the deflecting magnetic field has a disadvantage in that the core shrinks during the production by firing, resulting in large dimensional variations. As a result, the conventional deflection yoke has a problem that the positioning accuracy of the core is low.

[0007] In addition, there is a case where the positioned core is displaced due to the stress generated when the adhesive is cured, which also causes a problem that the positioning accuracy of the core is low.

The present invention has been made in view of the above points, and an object of the present invention is to propose a deflection yoke capable of improving the positioning accuracy of the core as compared with the prior art.

[0009]

According to the present invention, a wedge is inserted between a flange of a coil bobbin and an end face of a core to press and fix the core to a separator.

If a wedge is inserted between the flange of the separator and the end face of the core and the core is pressed and fixed to the separator, the core can be securely fixed even when the size of the core changes. Displacement can also be effectively avoided. Thereby, the positioning accuracy of the core can be improved as compared with the related art.

[0011]

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

(1) First Embodiment FIGS. 1A and 1B are a front view and a side view showing a state of a deflection yoke according to an embodiment of the present invention during manufacture. The description of the deflection yoke 20 shown in FIG. 1 will be omitted with the illustration of the vertical deflection coil and the front cover omitted.

The deflection yoke 20 has a core 3 having a saddle-shaped horizontal deflection coil and a vertical deflection coil wound thereon, as in the prior art.
a and 3b are arranged on the separator 22, and the back cover 23 and the like are arranged on the separator 22.

The separator 22 is formed into a substantially funnel shape by injection molding a resin, and has a collar 22a at the front end on the display screen side.
However, a collar 22b is integrally formed at the rear end of the electron gun. The front end of the collar 22a is formed with a protrusion protruding toward the side of the collar 22b. The front ends of the cores 3a and 3b are brought into contact with the protrusion, so that the cores 3a and 3
b can be positioned.

As shown in FIG. 2 which is partially enlarged by the arrow A, the flange 22b at the rear end is integrally formed with rectangular projections 24 and 25 projecting toward the flange 22a. Cores 3a and 3b are formed by protrusions 24 and 25.
The gap to the rear end face is partially reduced to form a gap i. The projections 24 and 25
Are formed at 180 ° angular intervals at positions corresponding to the portions where the end faces of the core are exposed, avoiding the winding portions of the vertical deflection coils.

The surface facing the separator 22 and the cores 3a and 3b with the gap i therebetween is formed as a rough surface.
A sufficient frictional force can be generated on the rough surface.

In the deflection yoke 20, the wedges 21 are inserted into the gaps i between the projections 24 and 25 and the cores 3a and 3b, and the cores 3a and 3b are temporarily fixed.

That is, as shown in FIG.
Is formed into a triangular cross section by injection molding the same resin as the separator 22. Further, the wedge 21 has a slope M1.
A surface M2 facing the slope M1 is formed in a rough surface, and a sufficient frictional force can be generated on these surfaces.

The wedge 21 is attached to the cathode ray tube with the assembled deflection yoke 20 and the raster image is displayed on the core 3 while visually confirming the raster image.
After being positioned while pressing the flanges a and 3b toward the collar 22a, they are pressed into the gaps i between the projections 24 and 25 and the cores 3a and 3b and attached to the deflection yoke 20. As a result, the wedge 21 presses the cores 3a and 3b, which have been positioned and adjusted with a small pressing force, toward the collar 22a, and presses the cores 3a and 3b.
Are temporarily fixed, and the frictional force generated by the rough surfaces formed on the projections 24, 25 and the cores 3a, 3b, the inclined surfaces of the wedges 21 and the opposing surfaces causes the cores 3a, 3b to be fixed. It is designed to prevent displacement.

As shown in FIG. 4, the deflection yoke 20 presses the welding ultrasonic head 26 against the wedge 21 to which the cores 3a and 3b are temporarily fixed, and applies the ultrasonic welding method to the wedge 21 so that the core 3a and 3b are fixed. 3a and 3b are welded to the separator 22. As a result, the deflection yoke 20 effectively avoids displacement of the cores 3a and 3b, and
a and 3b are permanently fixed.

In the above configuration, the deflection yoke 20
(FIG. 1) shows a core 3 on which a vertical deflection coil is wound beforehand after a horizontal deflection coil is arranged inside a separator 22.
a and 3b are arranged so as to surround the separator 22. Further, the deflection yoke 20 is assembled by arranging the horizontal deflection coil and the vertical deflection coil, and then arranging a back cover and the like.

Subsequently, the deflection yoke 20 is mounted on and driven by the cathode ray tube, and in this state, the operator who checks the display image of the cathode ray tube positions the cores 3a and 3b.
Here, the deflection yoke 20 is configured such that the cores 3a and 3b
The cores 3a and 3b are positioned at the optimum positions while being pressed to the side b.
Are positioned, and projections 24,
25, the wedge 21 is pressed into the gap i between the cores 3a and 3b.

As a result, the cores 3a and 3 having poor dimensional accuracy
b, the deflection yoke 20 moves the core 3a to the optimum position.
After positioning the cores 3a and 3b, the cores 3a and 3b are temporarily fixed at the determined positions.

Further, the cores 3a and 3b, the projections 24 and 25
A large frictional force is generated due to the rough surface formed on the wedge 21 and the rough surface of the wedge 21, and the subsequent displacement of the cores 3a and 3b is prevented.

Subsequently, the deflection yoke 20 is formed by using an ultrasonic welding method so that the wedges 21 have the cores 3a and 3b and the separator 22.
And the core 3a is positioned at the position thus determined.
And 3b are permanently fixed and completed.

According to the above construction, the cores 3a and 3b are positioned with higher precision than before by fixing the core to the separator with the wedge inserted between the flange of the separator and the end face of the core. Thereafter, the cores 3a and 3b can be fixed while preventing displacement. Therefore, the positioning accuracy of the cores 3a and 3b can be improved accordingly.

When an adhesive is used as in the past,
It takes a long time to cure, and the core that has been positioned may be misaligned due to the stress generated when the adhesive cures.However, the permanent fixing by ultrasonic welding method reduces the curing time. It can be omitted, and the positioning accuracy of the core can be improved.

(2) Second Embodiment FIG. 5 is a side view showing a deflection yoke according to a second embodiment of the present invention in comparison with FIG. This deflection yoke 30 inserts a wedge into the front end surfaces of the cores 3a and 3b. In the configuration shown in FIG. 5, the same components as those of the above-described first embodiment are denoted by the corresponding reference numerals, and the duplicate description will be omitted.

That is, in the deflection yoke 30, the separator 32 is formed into a substantially funnel shape by injection molding a resin, and a collar 32a is integrally formed at a front end portion on the display screen side and a collar 32b is formed at a rear end portion on the electron gun side. Molded into The rear end of the collar 32b has a projection formed on the side of the collar 32a. The rear ends of the cores 3a and 3b are brought into contact with the projection to position the cores 3a and 3b in the tube axis direction of the cathode ray tube. It has been made like that.

On the other hand, the front flange 32a has an arrow B
Cores 3a and 3b
Is pressed against the rear flange 32b, and the core 3a
A gap i is formed between the front end faces of the first and third parts 3b. Further, the flange 32a has a rough surface facing the end surfaces of the cores 3a and 3b so that a sufficient frictional force can be exerted.

On the other hand, the surfaces of the cores 3a and 3b opposed to the front flange 32a are formed rough, so that a sufficient frictional force can be exerted.

The wedge 21 is composed of the collar 32a and the core 3
a and 3b are pressed and inserted into a gap i between the front end faces. Here, the wedges 21 are arranged at 180 ° angular intervals at portions where the end face of the core is exposed, avoiding the winding portion of the vertical deflection coil. Thus, even when the dimensions of the cores 3a and 3b vary, the wedges 21 can press the cores 3a and 3b against the rear flange 32b to ensure reliable positioning.

Thus, similarly to the deflection yoke according to the first embodiment, the wedges 21 are used to position the cores 3a and 3b while visually confirming the raster image, and then the ribs 32a and the cores 3a and 3b of the separator 32 are positioned. After being attached to the deflection yoke 30 by pressing between them, it is welded to the separator 32 by ultrasonic welding.

According to the structure shown in FIG.
Of the cores 3a and 3b by inserting the wedge 21 between the front flange 32a and the end faces of the cores 3a and 3b.
2, the same effect as in the first embodiment can be obtained.

(3) Third Embodiment

FIG. 6 shows a third embodiment of the present invention in comparison with FIG.
FIG. 4 is a side view showing a deflection yoke according to the embodiment. In the deflection yoke 40, the back cover and the wedge are integrated. In the deflection yoke 40, components common to those of the above-described first embodiment are denoted by corresponding reference numerals, and redundant description will be omitted.

Here, as shown in FIG.
The deflection yoke 40 is formed by injection molding resin.
, A magnet for adjustment, and the like for holding the head at the neck of the cathode ray tube. The back cover 41 includes the separator 22
And covers the horizontal deflection coil H exposed from the flange 22b of the separator 22.

In the back cover 41, a part of the cylindrical side surface extends in a tongue-like manner toward the separator 22, and the inwardly extending claws 41b are formed at the tip of the tongue-like portion 41a at substantially 180-degree angular intervals. And fixed to the separator 22 by the claws 41b.

That is, the claw 41b is formed in a wedge shape having a rounded tip, and when the back cover 41 is pressed against the separator 22 as shown by an arrow D, the claw 41b abuts against the collar 22b and the tongue-shaped portion 41a extends outward. By bending
It is displaced outward so as to avoid the collar 22b. When the back cover 41 is further pressed against the separator 22, the claws 41b
Is displaced to the original position by the elastic force of the tongue-shaped portion 41a in the gap i between the collar 22b and the cores 3a and 3b,
The back cover 41 is held on the separator 22 by being hooked on the collar 22b.

The claw 41b is displaced inward when pressed from the outer periphery while being hooked on the collar 22b in this manner, and presses the cores 3a and 3b forward on the slopes of the cores 3a and 3b. As a result, it is formed large with respect to the interval of the gap i, and is arranged on the outer peripheral side with a sufficient margin with respect to the outer diameter of the collar 22b.

As a result, in the deflection yoke 40, as shown in FIG. 8, after positioning the cores 3a and 3b by crosstalk adjustment, the back cover 41 is tightened by the binding band 42 for wiring, and the cores 3a and 3b are Is pressed and fixed to the separator 22.

According to the structure shown in FIG.
Even if the claw 41b holding the back cover 41 also serves as a wedge, the same effect as in the first embodiment can be obtained. Further, since the claw 41b also serves as a wedge, the number of parts can be reduced accordingly.

(4) Other Embodiments In the above-described embodiment, the case where the core is fixed with a wedge having a triangular cross section has been described. However, the present invention is not limited to this. Wedges of various shapes can be widely applied, for example, when a portion is extended to form an insertion margin.

Further, in the above embodiment, 18
The case where wedges are arranged at an angular interval of 0 degrees has been described, but the present invention is not limited to this, and the arrangement position can be appropriately selected as necessary, such as when the wedges are arranged at an angular interval of 90 degrees.

In the first and second embodiments described above, the case where the wedge is permanently fixed by ultrasonic welding has been described. However, the present invention is not limited to this, and the case where the wedge is permanently fixed with an adhesive or the like is described. In addition, various fixing methods can be widely applied. If sufficient strength for practical use can be ensured, the fixing process may be omitted.

Further, in the above embodiment, the case where the magnet wire is wound around the core to form the vertical deflection coil has been described. However, the present invention is not limited to this, and the magnet wire may be wound around the separator. The present invention can also be applied to a case where a vertical deflection coil is formed in a saddle shape.

In the first and second embodiments described above, the case where the core is positioned by monitoring the raster image and then temporarily fixed by the wedge has been described. However, the present invention is not limited to this, and the present invention is not limited to this. When sufficient characteristics are obtained, the adjustment work before the temporary fixing may be omitted, or the temporary fixing may be performed after the crosstalk adjustment.

[0048]

As described above, according to the present invention, the core is pressed and fixed to the coil bobbin by the wedge inserted between the flange of the coil bobbin and the end face of the core, so that the positioning accuracy of the core can be improved. .

[Brief description of the drawings]

FIG. 1 is a front view and a side view showing a deflection yoke according to a first embodiment of the present invention.

FIG. 2 is a side view showing a partially enlarged deflection yoke of FIG. 1;

FIG. 3 is a perspective view showing a wedge.

FIG. 4 is a side view for explaining the permanent fixing of the core of the deflection yoke in FIG. 1;

FIG. 5 is a side view showing a deflection yoke according to a second embodiment.

FIG. 6 is a side view showing a deflection yoke according to a third embodiment.

FIG. 7 is a side view for explaining attachment of a back cover in the deflection yoke of FIG. 6;

FIG. 8 is a side view showing a state where a binding band is attached to the deflection yoke of FIG. 6;

FIG. 9 is a side view showing a conventional deflection yoke.

[Explanation of symbols]

1, 20, 30, 40 ... deflection yoke, 2, 22, 32
... Separator, 2a, 2b, 22a, 22b, 32
a, 32b ... brim, 3a, 3b ... core, 21 ... wedge, 42 ... binding band, M1, M2 ... rough surface

Claims (3)

[Claims] 1. A deflection yoke in which a magnetic circuit of a deflection magnetic field is formed by a substantially conical cylindrical core, wherein a wedge is inserted between a flange of a coil bobbin and an end face of the core, and the core is attached to the coil bobbin by the wedge. A deflection yoke which is fixed by pressing. 2. The deflection yoke according to claim 1, wherein said wedge is welded to said coil bobbin. 3. The deflection yoke according to claim 1, wherein a back cover disposed on a neck bend side of the coil bobbin and the wedge are integrated.