JPS5933156Y2 - Deflection yoke device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a deflection yoke device used, for example, in television receivers.

In general, images projected onto a picture tube of a television receiver or the like are distorted into a left-right pincushion shape.

Conventionally, as a countermeasure against this problem, deflection pincushion distortion was corrected using an electric circuit using a correction transformer, but in this case, the electric circuit system in the television receiver becomes complicated and the number of parts increases, making it difficult to reproduce the image. It had the drawbacks of low reliability and high manufacturing costs.

Therefore, in recent years, proposals have been made to correct the leakage magnetic field of the vertical coil by guiding it forward of the deflection yoke device using a magnetic material.

This example will be explained with reference to FIG. 1. The illustrated deflection yoke device 11 uses a so-called coil separator as a bobbin.

This coil separator 12 consists of a front enlarged part 121, a conical cylinder part 122, and a rear enlarged part 123, and a pair of saddle-shaped horizontal coils are mounted on the inner surface thereof.

A pair of vertical coils 13, 13 are attached to the outer periphery of the conical cylinder portion 122 of the coil separator 12.

That is, the vertical coils 13, 13 are toroidally wound so as to face the core 14.

Reference numeral 15 is made of the magnetic material and is formed into a substantially U-shape.

A pair of such magnetic bodies 15 are provided in the vicinity of the enlarged front part 121, facing each other on both left and right sides of the enlarged front part 121.

However, only one magnetic body is shown in the figure. When the deflection yoke device 11 having the magnetic material 15 is disposed in the picture tube 16 in this way, the front enlarged portion 121 is placed on the cone portion 161 side,
The rear enlarged portion 123 is arranged so as to be located on the neck portion 162 side.

Furthermore, the tip portions of the leg pieces 151, 151 of the magnetic body 15 are arranged so as to abut against the cone portion 161.

Then, the neck tightening cylindrical portion 124 provided at the rear of the rear enlarged portion 123 is surrounded by the tightening band 17, and the tightening screw 18
By tightening the deflection yoke device 11, the picture tube 1
It is fixed at 6.

However, since the magnetic body 15 is a press-molded metal product, it has high rigidity.

Therefore, the deflection yoke device 11 is disposed on the picture tube 16 so as to be pressed forward, that is, toward the cone section 161, so that the tips of the legs 151, 151 of the magnetic body 15 come into contact with the outer peripheral surface of the cone section 161. However, since the deflection yoke device 11 is generally pulled slightly toward the neck portion 162 when tightening the neck tightening cylindrical portion 124, the tip portion 151
is separated from the outer surface of the cone portion 161.

In such a state, the strength of the magnetic field directed from the tip of the magnetic body 15 toward the picture tube 16 becomes weaker, and the strength of this magnetic field also has the disadvantage that it varies depending on variations in the pulling distance of the deflection yoke device 11.

On the other hand, in the neck tightening cylindrical part 124, the picture tube 16
As shown in FIG. 2, the convergence of the deflection yoke device 11 fixed to the deflection yoke device 11 is generally adjusted by adjusting the oscillation using a wedge 19 made of, for example, rubber.

However, this method of using separate parts such as the wedge 19 to align the center of the electron beam with the center of the magnetic field of the deflection yoke device has the disadvantage that the manufacturing cost of the television receiver increases.

This idea was made to address the above-mentioned circumstances, and it is possible to create a magnetic field distribution that is always constant and of sufficient strength within the picture tube, thereby reliably correcting left-right pincushion distortion on the reproduced screen without variation. It is an object of the present invention to provide a deflection yoke device that can significantly reduce the number of parts, assembly and adjustment man-hours, and manufacturing costs of, for example, a television receiver.

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

First, FIG. 3 shows an embodiment of this invention, in which magnetic materials 30121. The outside is the deflection yoke device 1 shown in Figure 1 above.
It is almost the same as 1.

That is, a pair of saddle-shaped horizontal coils are attached to the inner surface of the coil separator 22 having a front enlarged part 221, a conical cylinder part 222, and a rear enlarged part 223, and are toroidally wound around the core 24 around the outer circumference of the conical cylinder part 222. A pair of vertical coils 23, 23 are installed.

Reference numerals 224, 27, and 28 are a neck tightening cylindrical portion, a tightening band, and a tightening screw for fixing the deflection yoke device 21 to the neck portion 262 of the picture tube 26.

Next, the magnetic body 30 will be explained.

Although only one magnetic body 30 is shown in the figure, in reality, a pair of magnetic bodies 30 are provided facing each other on both left and right sides in the vicinity of the front enlarged portion 221.

Each magnetic body 30 includes a main body obtained by press-molding metal, for example, and an elastic tongue piece 2A.

Consists of 2A.

The main body includes a base piece 301 formed in a substantially arc shape disposed along the outer peripheral surface of the front enlarged part 221 side end of the core 24 around which the vertical coils 23 and 23 are wound, and a curved direction of this base piece 301. It consists of leg pieces 302, 302 located at both ends, respectively.

Further, the base piece 301 is positioned so as to span between the vertical coils 23, 23, and the leg pieces 302, 302 extend stepwise toward the cone portion 261 side of the picture tube 26 along the outer peripheral surface of the front enlarged portion 221. is present.

Elastic tongue pieces 2A, 2A are attached to the tips of the leg pieces 302, 302, respectively.

Figure 4 shows an enlarged view of the two leg pieces 302.
One end of the elastic tongue piece 2A is caulked (
Alternatively, it may be attached by an adhesive, for example.

However, this elastic tongue piece 2A is attached to the cone portion 26 of the picture tube 26.
1 is attached so as to be located inside the picture tube 26 from the assumed outer surface.

The elastic tongue piece 2A formed in this way is shown by the arrow (
It has an elastic force in the P++Q) direction.

Note that a magnetic body (not shown) provided opposite to the magnetic body 30 shown in FIG. 3 is also formed in substantially the same manner as the magnetic body 30 shown.

When the deflection yoke device 11 having the magnetic body 30 having the above configuration is disposed near the boundary between the cone portion 261 and the neck portion 262 of the picture tube 26, when the deflection yoke device 21 is pressed against the cone portion 261 side of the picture tube 26, As shown in FIG. 5, the elastic tongue 2A is elastically deformed in the direction of the arrow (P) from the state shown by the broken line in the drawing.

Then, when the neck tightening cylindrical part 224 is tightened, the deflection yoke device 21 is slightly pulled toward the neck part 262 as described above, but in this case, the elastic tongue piece 2A only slightly returns to its elastic deformation, and the outer surface of the cone part 261 still remains. It remains pressed.

Therefore, even if the attachment position of the deflection yoke device 21 to the picture tube 26 varies, the strength of the magnetic field exerted on the picture tube 26 by the elastic body 30 can always be kept constant and sufficient, and the left and right pincushion of the image can be maintained constant. Distortion can be reliably corrected without variation.

Furthermore, as each elastic tongue 2A comes into pressure contact with the cone portion 261 of the picture tube 26, the deflection yoke device 21 automatically adjusts its center axis to the center axis of the picture tube 26 due to the mutual elastic action of the elastic tongues. and this positioning is maintained.

In other words, convergence adjustment is performed by automatically aligning the center of the electron beam with the center of the magnetic field of the deflection yoke device, eliminating the need for separate parts such as wedges that were conventionally required to adjust convergence. It is possible to significantly reduce manufacturing and assembly costs of television receivers, and significantly reduce assembly and adjustment man-hours.

Note that this invention is not limited to the previous embodiment.

First, the general shape of the magnetic material is not limited to a U-shape having a base piece and leg pieces, but may be, for example, a piece-like shape.

Further, as a structure for imparting elastic force to the portion of the magnetic body that contacts the cone portion of the picture tube, a plurality of slits 36 may be provided in the magnetic body 35 as shown in FIG.

Alternatively, as shown in FIG. 7, a plurality of locations for attaching the elastic tongues 38 may be set at the tip of the magnetic body 37 so that the attachment position of the elastic tongues 38 can be varied.

In this way, the elastic tongue piece 38 can be attached at a position where the optimum magnetic effect can be obtained.

Furthermore, if the main body and the elastic tongues are made of non-magnetic material as shown in FIG. 3, for example, the deflection yoke device can have only the function of aligning the center of the magnetic field of the deflection yoke device with the central axis of the picture tube.

In this way, according to this invention, it is possible to reliably correct left and right pincushion distortion on the reproduced screen without variation, and it is also possible to automatically align the center of the magnetic field with the central axis of the picture tube just by attaching it to the picture tube. Therefore, it is possible to provide a deflection yoke device that can significantly reduce the number of parts, assembly and adjustment man-hours, and manufacturing costs of, for example, a television receiver.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view for explaining a conventional example of a deflection yoke device having a magnetic material, and FIG. 2 is a schematic side view for explaining convergence adjustment in a conventional deflection yoke device.
FIG. 3 is a schematic perspective view showing an embodiment of the deflection yoke device according to the present invention, FIG. Fig. 5 is an enlarged side view of the main parts for explaining the action of the characteristic parts of the deflection yoke device shown in Fig. 3, and Fig. 6 shows a modification of the characteristic parts of the deflection yoke device according to this invention. FIG. 7 is an enlarged perspective view of the main part showing another modification. 21...Deflection yoke device, 22...Coil separator, 221...Front enlarged portion, 22
2... Conical cylinder part, 223... Rear enlarged part, 23... Vertical coil, 24...
Core, 26... picture tube, 261... cone section, 262... neck section, 30...
・Magnetic material, 2A...Magnetic tongue piece.

Claims (1)

[Scope of utility model registration request] A pair of saddle-shaped horizontal coils are installed on the inner surface of a coil separator having a front enlarged part, a conical cylinder part, and a rear enlarged part, and a pair of vertical coils toroidally wound around a core are installed on the outer periphery of the conical cylinder part. , a deflection yoke device in which the front enlarged portion is located on the collar side and the rear enlarged portion is located on the neck side with respect to the picture tube; A plurality of magnetic coils are arranged at predetermined intervals in the rotation angle direction, one end of which is located at the end of the front enlarged portion of the vertical coil, and the other end of which is elastically pressed against the outer surface of the cone. A deflection yoke device characterized by having a body.