JP2000150260A - Linearity coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of vibration isolating measures by molding the body of a coil, formed by winding wires on a drum core, so that the entire body of the coil is covered with magnet resin prepared by mixing magnetic material powder with resin. SOLUTION: A linearity coil 1a is formed by winding wires 5 on a drum core 4 to form a coil body 10, installing a base 6 on the underside of the coil body 10, and connecting the leads 8 of the wires 5 to terminals 7 planted in the base 6. Then the coil body 10 of the linearity coil 1a is molded using an almost cylindrical cured resin 20. The resin 20 is a magnet resin prepared by mixing magnet powder with binder of thermosetting silicon synthetic resin. The weight of the magnet powder in the magnet resin 20 is controlled to the same value as that of a permanent magnet placed on the coil body 10. As a result, the permanent magnet for controlling linearity characteristics can also be used as molded resin as a vibration suppressing member in the linearity coil 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linearity coil used as a circuit component for correcting horizontal distortion of a screen in a cathode ray tube type image display device such as a television receiver or a CRT display for a personal computer.

[0002]

2. Description of the Related Art A linearity coil is inserted between a horizontal deflection oscillator and a horizontal deflection coil of a cathode ray tube type image display device, and has a function of changing a deflection current when an electron beam scans the center and the end of the cathode ray tube. I do. Thereby,
The horizontal distortion of the screen is corrected.

[0003] A conventional linearity coil is, for example, a coil body 1 having a winding 5 wound around a drum core 4 having flanges 2 and 3 at both ends as shown in a side view shown in FIG.
A permanent magnet 9 is placed on the coil base 10, and a base 6 on which a terminal 7 is provided is attached on the lower end side of the coil body 10, and a lead 8 of the winding 5 is connected to the terminal 7. Has become.

In the linearity coil 1c, desired current-inductance characteristics can be obtained by appropriately combining the conditions of the coil body 10 (number of turns, core diameter, etc.) and the conditions of the permanent magnet (magnetic flux density, outer diameter, etc.). It has become.

[0005]

When the linearity coil is operating, a high-frequency current corresponding to the horizontal scanning frequency flows through the winding of the coil body. This current causes a magnetic repulsion between the coil body and the permanent magnet, and the drum core vibrates. This vibration is transmitted to the outside of the image display device as a high-frequency beat sound, and causes a noise problem.

Heretofore, in order to prevent the generation of the beat noise, the coil body and the permanent magnet have been covered with an integral rubber tube or molded with a synthetic resin. But,
The manufacturing process related to the vibration isolation measures is complicated and requires a large number of processes, which has caused a cost increase of the linearity coil.

Further, since the conventional linearity coil is in an open state as a magnetic circuit, the leakage of magnetic flux is large and the deflection of the electron beam of the CRT is disturbed, possibly deteriorating the image quality of the image display device.

Accordingly, an object of the present invention is to provide a linearity coil capable of implementing sufficient anti-vibration measures at low cost and eliminating leakage of magnetic flux.

[0009]

According to a first aspect of the present invention, there is provided a linearity coil in which a coil body wound around a drum core is covered with a magnet resin obtained by mixing a magnetic powder and a resin. It is doing. That is, a permanent magnet for controlling the linearity characteristic is mixed in the mold resin as the vibration damping member. And
Since the magnet powder contained in the resin covers the coil body, leakage of magnetic flux can be effectively prevented.

A linearity coil according to a second aspect of the present invention is provided such that the entire coil body is housed in a case having a hollow cylindrical shape with a bottom, and the magnet resin molds the coil body and fixes the case. It is filled inside. Thereby, a step of molding with a mold can be omitted when the linearity coil is manufactured.

[0011]

FIG. 1 is a side view of a linearity coil according to an embodiment of the present invention. A base 6 is attached to the lower surface of the coil body 10 in which the winding 5 is wound around the drum core 4. The lead portion 8 of the winding 5 is connected to the terminal 4 implanted on the base 6. The structure up to this point is the same as the above-described structure in which the permanent magnet is removed from the linearity coil 1c.

Further, the linearity coil 1
a, the coil body 10 is formed into a thick-walled film (mold) by a resin 20 having a substantially cylindrical shape and hardened (in the present embodiment, the resin 20 extends to the base 6 and the connection portion of the lead portion 8 of the terminal 7). Covered by.). The resin 20 is a magnet resin 20 obtained by mixing a magnet powder with a binder made of a thermosetting silicon-based synthetic resin.

The magnet powder contained in the magnet resin 20 is supposed to have the same structure as the conventional linearity coil using the coil body 10,
The weight is the same as the weight of the permanent magnet placed on the zero. That is, when a permanent magnet having a certain weight is placed on the coil body 10, a conventional linearity coil having a certain linearity characteristic (FIGS. 3 and 1c) is obtained, and an amount of magnet powder necessary for forming the permanent magnet is removed by a binder. When the coil body 10 is molded by mixing the above, the linearity coil 1a of the embodiment is obtained. Thereby, the linearity coil 1
The linearity characteristic of a is the conventional linearity coil 1c
Is equivalent to In order to mold the magnet resin 20 into the coil body 10, the magnet resin is poured into a hollow cylindrical molding die (mold mold) containing the coil body 10, and is thermoset at an appropriate temperature atmosphere. Just take it out of

In the case of a linearity coil in which the components of the coil body 10 are housed in a case, as shown in FIG. 2, the magnet resin 20 is housed in the case 30 with the coil body 10 housed in the case 30. It may be poured and then cured. Thereby, the magnet resin 20 molds the coil body 10 and the case 3
0 is fixed.

As a binder of the magnet resin 20,
An epoxy-based synthetic resin can be used in addition to the silicon-based synthetic resin. The curing type is not limited to the thermosetting type, and various types such as a UV curing type and a room temperature curing type can be selected.
Further, the portions to be molded with the magnet resin 20 are the same as those in the above embodiment (from the upper end of the coil body 10 to the terminals 7 and the lead wires 8).
Not only the portion of the coil main body 10 but also the root of the terminal 7, which can be changed as appropriate according to the installation conditions of the linearity coils 1 a and 1 b on the circuit board. Of course, the coil body 1
If only the part of 0 is molded with the magnet resin 20,
The mold shape after curing does not need to be cylindrical.

[0016]

As described above in detail, according to the linearity coil of the present invention, the permanent magnet for controlling the linearity characteristic and the mold resin as the vibration damping member are used. Therefore, a beat sound can be effectively prevented during operation. Further, since the coil body is covered with the magnetic material, the magnetic circuit is closed, and the leakage magnetic flux from the linearity coil can be eliminated. Therefore,
Image quality degradation of the image display device can be prevented. Further, at the time of manufacturing, cost reduction can be expected due to simplification of the process, and the linearity coil can be provided at low cost.

Further, the coil body is housed in a case,
If the case is filled with a magnet resin and the case is fixed, the molding step using a mold during manufacturing can be omitted, and further cost reduction can be expected.

[Brief description of the drawings]

FIG. 1 is a side view of a linearity coil according to an embodiment of the present invention.

FIG. 2 is a side view of a modified example of the linearity coil.

FIG. 3 is a side view of a conventional linearity coil.

[Explanation of symbols]

 1a, 1b, 1c Linearity coil 4 Drum core 10 Coil body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Sato 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Ohiko 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji F term (reference) in Electrochemical Co., Ltd. 5C068 AA01 AA20 KA15 5E058 BB19

Claims (2)

[Claims] 1. A linearity coil characterized in that a coil body formed by winding a coil around a drum core is molded so as to be covered with a magnet resin obtained by mixing a magnetic powder and a synthetic resin. 2. The case according to claim 1, wherein the entire coil body is housed in a hollow cylindrical case having a bottom, and the magnet resin molds the coil body and fixes the case in the case. A linearity coil characterized by being filled.