JPH0210710Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a convergence device for dynamic convergence mounted on an in-line color cathode ray tube network.

Recently, as a convergence device for dynamic convergence installed on an in-line color cathode ray tube neck, a plurality of legs are integrally extended from the inner surface of an annular core toward the center, and a plurality of legs are installed on the legs. A device has been developed and put into practical use that generates a magnetic field of a predetermined magnetic pole on the leg piece by winding a coil around it and energizing the coil, and converges an electron beam by the action of the magnetic field.

In the conventional convergence device in this field, as shown in FIGS. 1 to 3, twelve leg pieces 2 ₁ to 2 ₁₂ are provided on the inner surface of the annular core 1 at equal intervals and extending toward the center. , 2 poles, 4 poles on leg pieces 2 ₁ to 2 ₁₂ ,
A case holder 5 made of a molded product such as polypropylene holds a convergence device main body 4, which is made up of a coil 3 that is wound and attached to form six magnetic poles (magnetic field).
After configuring the convergence device CN by storing and fixing the convergence device CN in a cylindrical portion 5a having a bottomed cylindrical shape with an opening on one side, It was mounted and fixed onto the neck portion 6a of the cathode ray tube 6. However, in this case, as shown in FIGS. 2 and 3, in order to hold and fix the convergence device main body 4 within the cylindrical portion 5a of the case holder 5,
The inner wall 5c of the molded product is formed by going around the bottom surface of the cylindrical portion 5a and abutting the tips of the leg pieces 2 ₁ to 2 ₁₂ formed on the cylindrical core 1. Therefore, the distance between the tip surface of each of the legs 2 ₁ to 2 ₁₂ of the core 1 and the surface of the neck portion 6a of the cathode ray tube 6 increases by the thickness of the inner wall 5c (at least 0.6 mm).
The length (dimensions) of leg pieces 2 ₁ to 2 ₁₂ are similar to the inner wall 5c.
As the convergence device main body 4 is not molded with insulating resin, the cylinder of the case holder 5 is shortened by the thickness (inner diameter is large) and the magnetic susceptibility decreases accordingly, which causes deterioration of sensitivity. The convergence device body 4 is fixed using an inner wall 5c provided in the section 5a, but the fixation is not secure and strong, and mechanical vibrations and shocks are directly applied to the convergence device body 4, causing the device body 4 to be displaced positionally. There is a risk that the case holder 5 may fall off, making it difficult to obtain a desired magnetic field.
The shape of the inner wall 5c becomes more complicated due to the provision of the inner wall 5c.

The present invention relates to a convergence device for a color cathode ray tube for dynamic convergence, which aims to eliminate the above-mentioned drawbacks. The present invention relates to a convergence device that forms a film to achieve increased sensitivity.

Hereinafter, one embodiment of the convergence device of the present invention will be described in detail with reference to the drawings. Here, the same parts as in the prior art are given the same numbers and the explanation thereof will be omitted. In the convergence device of the present invention, as shown in FIG. 4, the convergence device main body 4 is housed and fixed at a predetermined position within the cylindrical portion 5a of the case holder 5, and an insulating resin 7 such as silicone is inserted into the cylindrical portion 5a. is injected and filled, and the convergence device main body 4 is molded. At that time, a thin film 8 having a thickness of 0.1 mm to 0.3 mm made of insulating resin 7 is installed on the tip side of the 12 legs 2 ₁ to 2 ₁₂ of the cylindrical core 1 of the convergence device main body 4 in place of the conventional inner wall 5c. It is formed by forming. Here, the thin film 8 on the tip side of each leg piece 2 ₁ to 2 ₁₂ is, for example,
As shown in FIG. 5, the convergence device main body 4
Teflon or the like whose size (shape) is set in advance so that a slight gap S is formed between the cylindrical portion 5a of the case holder 5 in which the holder 5 is housed and the tip surfaces of the leg pieces 2 ₁ to ₂ 12 . The insulating resin 7 is inserted into the cylindrical portion 5a from the opening side.
When molding the convergence device main body 4 by injecting and filling, a part of the resin 7 is mixed into the leg pieces 2 ₁ to 2 ₁₂
It flows into the gap S between the tip and the surface of the inner diameter rod 9, and is formed by removing the inner diameter rod 9 after the resin 7 hardens.

In one embodiment of the convergence device of the present invention, a plurality of (12
As described above, an inner diameter rod is used to form a thin film of insulating resin on the tip of each leg of the case holder. As long as a thin resin film is formed on the tip side, the forming means is not limited to the embodiments and is arbitrary. In addition, in one embodiment of the convergence device of the present invention, the inner surface of the cylindrical core is provided with
We have described a model with 12 legs extending toward the center, but the number of legs can also be changed as long as the coil is wound so that a magnetic field of 2 poles, 4 poles, or 6 poles is generated.
The number is not limited to 12, and can be increased or decreased as appropriate.

As described above, according to the convergence device of the present invention, a plurality of legs are provided on the inner surface of the cylindrical core at equal intervals and extend toward the center, and two sets of two poles and two sets of four poles are mounted on each leg. The convergence device main body is formed by winding six-pole coils with their magnetic poles arranged alternately, and the convergence device main body is formed by continuously extending a cylindrical portion having an open end on one side and a bottom surface of the cylindrical portion. The convergence device body is molded by injecting and filling insulating resin into the cylindrical portion, and the convergence device body is molded. A thin film of insulating resin is formed on the tip of each leg of the core, and the distance between the tip of the core leg and the surface of the cathode ray tube neck is only the thickness of the film, that is, 0.1 mm to 0.3 mm. This is significantly shorter than the conventional inner wall made of a molded product with a thickness of at least 0.6 mm, while the length (dimensions) of the leg piece is also extended by the shortened distance between the tip of the leg piece and the net surface. (The inner diameter of the core legs becomes smaller), and the magnetic susceptibility increases accordingly.In both cases, the magnetic field from the core legs acts effectively on the beam, increasing the sensitivity of the convergence device. It is something. In addition, since the tips of the legs of the core are covered with a resin film, there is no risk of the core (legs) being damaged when attached to the cathode ray tube neck, and the characteristics are stable. . moreover,
An insulating resin film is formed on the tip end of the leg of the core using an inner diameter rod or the like, which makes it possible to reduce variations in the inner diameter of the product and is highly suitable for mass production. Furthermore, since the convergence device is molded inside the cylindrical part of the case holder using insulating resin, the main body of the convergence device can be securely and firmly fixed, and can withstand mechanical vibrations and shocks. It is absorbed by the resin and is not applied directly to the device body, so the device body will not be displaced positionally, and a stable predetermined magnetic field can always be obtained, improving the reliability of the convergence device.
This can improve safety. in this way,
The present invention has various effects depending on its configuration, and is particularly effective as a convergence device for dynamic convergence of an in-line color cathode ray tube.

[Brief explanation of the drawing]

FIG. 1 is a partially transparent perspective view of a conventional convergence device for color cathode ray tubes, FIG. 2 is a plan view, FIG. 3 is a cross-sectional side view, and FIG. FIG. 5 is a cross-sectional side view of a convergence device, and FIG. 5 is a cross-sectional side view of a part of a manufacturing means for obtaining a convergence device for a color cathode ray tube. 1... Cylindrical core, 2 ₁ to 2 ₁₂ ... Core leg piece, 3...
2, 4, 6-pole coil, 4... Convergence device main body, 5... Case holder, 5a... Case holder cylindrical part, 7... Insulating resin, 8... Thin film of resin.

Claims (1)

[Scope of utility model registration request] A plurality of legs are provided extending toward the center at equal intervals on the inner surface of the annular core, and on each leg, two sets of two poles,
A convergence device main body is formed by winding 4-pole and 6-pole coils with their magnetic poles arranged alternately, and the convergence device main body is connected to a cylindrical portion having an open end on one side and a bottom surface of the cylindrical portion. The convergence device body is housed and fixed in the cylindrical portion of the case holder consisting of a continuously extending fixing portion, and insulating resin is injected and filled into the cylindrical portion to mold the convergence device body. A convergence device for a color cathode ray tube, characterized in that a thin film of the insulating resin is formed on each tip of a plurality of leg pieces provided on the inner surface of the cylindrical core.