JPH0992542A - Linearity coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate gaps between the upper flange of a drum core and a ring core by a method wherein the gaps between the upper flange of the drum core and the ring core are blocked with a blocking member. SOLUTION: The upper end parts of a ring core 30 are fixed inside a guide protrusion 20C with a bonding agent on the upper surface side of a pedestal 20. A dram core 40 has flanges 40a and 40a on both ends of a bar-shaped wound core part 40b and consists of a soft magnetic material. Two coils 50 and 50 are wound on the core 40. The core 40 is coaxially inserted in the interior of the core 30. A square projected part 40c is protuberantly formed on the flange 40a on one side of the flanges of the core 40 and this flange 40a is fixed in a recess part 20d in the upper surface side of the pedestal 20 in a state that the part 40c is fitted in a recess 20e in the pedestal 20. The upper end parts of the core 30 and the upper flange 40a of the core 40 are coated with a coating member 60.

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 in a horizontal deflection distortion correction circuit of a device using a cathode ray tube such as a television receiver.

[0002]

2. Description of the Related Art FIG. 9 is a perspective view of an example of a conventional linearity coil, and FIG. 10 is a sectional view of an example of a conventional linearity coil. For example, as shown in these figures, the conventional linearity coil has a base 20 and a base 20.
And a drum core 40 that is coaxially inserted inside the ring core 30.
And a coil 50 wound around the drum core 40.

The pedestal 20 is made of a synthetic resin molded body, and feet 20a are formed on the lower surface of the pedestal 20 so as to project downward along the outer periphery of the pedestal 20.

Five pin-shaped lead terminals 22 are planted downward on the lower surface side of the pedestal 20. Of the five lead terminals 22, four lead terminals 22 are respectively planted in the central region of the pedestal 20 at positions located at the respective apexes of the square, and one lead terminal 22 corresponds to one foot portion 20a. It is planted in the vicinity for positioning.

Guide protrusions 20c are formed on the upper surface of the pedestal 20 along the outer periphery of the pedestal 20 so as to form a circle inward. The diameter of this circle is approximately equal to the diameter of the ring core 30. A circular recess 20d is formed in the central region on the upper surface side of the pedestal 20.
A small square recess 20e is formed in the center of the. The diameter of the recess 20d is almost equal to the diameter of the flange 40a of the drum core 40 described later.

The ring core 30 is made of a cylindrical permanent magnet material, and one end of the ring core 30 is fixed to the upper surface side of the pedestal 20 inside the guide protrusion 20c with an adhesive.

The drum core 40 is made of a soft magnetic material having flanges 40a, 40a on both ends of a rod-shaped winding core 40b. A square protrusion 40c is formed on one of the flanges 40a of the drum core 40 so as to protrude therefrom.
0a is fixed to the recess 20d on the upper surface side of the pedestal 20 with an adhesive in a state where the protrusion 40c is fitted in the recess 20e of the pedestal 20.

Four lead terminals 2 are provided on the side of the pedestal 20.
The slit-shaped kerfs 20f reaching the vicinity of 2 are each formed. The end of the coil 50 is entwined with the lead terminal 22 through the cut groove 20f and fixed by soldering.

According to this linearity coil, for example, in a horizontal deflection distortion correction circuit of a television receiver, the linear deflection coil is arranged in series with the horizontal deflection yoke, and the triangular wave current flowing through this circuit is adjusted to adjust the horizontal direction of the receiver. The distortion is corrected.

[0010]

By the way, in the above linearity coil, a slight gap is formed between the flange of the drum core and the ring core. May invade.

When a foreign substance enters the internal coil through this gap, the drum core vibrates due to magnetostriction in a state where a current is flowing through the linearity coil, and the coil wound around the drum core also vibrates. When the foreign matter that has entered and the coating of the coil rub against each other and peel off the coating, and the foreign matter is a conductive substance, the coil may cause a short circuit and the electrical characteristics of the linearity coil may change.

When a foreign substance enters the internal coil through this gap, the drum core vibrates due to magnetostriction in a state where current flows through the linearity coil, and the coil wound around the drum core also vibrates. Therefore, the foreign matter may cause the linearity coil to produce an unpleasant sound.

An object of the present invention is to provide a linearity coil which prevents foreign matter from entering through a gap between the ring core and the flange of the drum core.

[0014]

In order to solve the above problems, the present invention provides a pedestal having a lead terminal on one side, a ring core attached to the other side of the pedestal, and an inside of the ring core. Has a drum core coaxially inserted therein and a coil wound around the drum core, the ring core is made of a cylindrical permanent magnet, and one end of the ring core is attached to the other side of the pedestal. The drum core is made of a soft magnetic material having flanges at both ends of the winding core, one flange of which is attached to the other side of the pedestal, and the end of the coil is attached to the lead terminal. In the connected linearity coil,
A gap between the other flange of the drum core and the ring core was closed with a closing member.

Here, as a mode of closing the gap between the other flange of the drum core and the ring core with a closing member, there is a method of covering the gap with a covering member or filling the gap with a filling member. it can.

As a method for covering the gap between the other flange of the drum core and the ring core with a covering member, the tip of the linearity coil may be dipped in a synthetic resin paint or a synthetic resin adhesive, and this may be cured. A synthetic resin plate or a synthetic resin sheet may be bonded with an adhesive, or a synthetic resin cap may be covered.

As a method for filling the gap between the other flange of the drum core and the ring core with a filling member, a synthetic resin adhesive or a cured product of a synthetic resin paint may be filled in the gap, or a synthetic resin ring may be used. It may be filled. The type of ring made of synthetic resin may be an O-ring or a ring having a T-shaped cross section.

[0018]

【Example】

First Embodiment FIG. 1 is a perspective view of a linearity coil according to a first embodiment of the present invention, FIG. 2 is a plan view of a pedestal of the linearity coil of FIG. 1, FIG. 3 is a rear view of the linearity coil of FIG. FIG. 2 is a sectional view of the linearity coil of FIG. 1. In these figures, the linearity coil 10
Is a pedestal 20, a ring core 30 attached above the pedestal 20, a drum core 40 coaxially inserted into the ring core 30, and two coils 50, 50 wound around the drum core 40. Consists of.

The pedestal 20 is made of a synthetic resin molding, and three legs 20a are formed on the lower surface of the pedestal 20 so as to project downward along the outer periphery of the pedestal 20. 3 legs 2
0a is formed at each of the vertices of an equilateral triangle. A hemispherical small protrusion 20b is formed at the tip of the foot portion 20a.

Five pin-shaped lead terminals 22 are planted downward on the lower surface side of the pedestal 20. Of the five lead terminals 22, four lead terminals 22 are respectively planted in the central region of the pedestal 20 at positions located at the respective apexes of the square, and one lead terminal 22 corresponds to one foot portion 20a. It is planted in the vicinity for positioning. 4 lead terminals 2
Two ends of the two coils 50, 50 are respectively connected to the coil 2 in a entwined state.

Guide protrusions 20c are formed on the upper surface of the pedestal 20 along the outer periphery of the pedestal 20 so as to form a circle inward. The diameter of this circle is approximately equal to the diameter of the ring core 30. A circular recess 20d is formed in the central region on the upper surface side of the pedestal 20.
A small square recess 20e is formed in the center of the. The diameter of the recess 20d is almost equal to the diameter of the flange 40a of the drum core 40 described later.

The ring core 30 is made of a cylindrical permanent magnet material, and one end of the ring core 30 is fixed to the upper surface side of the pedestal 20 inside the guide protrusion 20c with an adhesive.

The drum core 40 is made of a soft magnetic material having flanges 40a, 40a at both ends of a rod-shaped winding core 40b. A square protrusion 40c is formed on one of the flanges 40a of the drum core 40 so as to protrude therefrom.
0a is fixed to the recess 20d on the upper surface side of the pedestal 20 with an adhesive in a state where the protrusion 40c is fitted in the recess 20e of the pedestal 20.

Four lead terminals 2 are provided on the side of the pedestal 20.
The slit-shaped kerfs 20f reaching the vicinity of 2 are each formed. The end of the coil 50 is entwined with the lead terminal 22 through the cut groove 20f and fixed by soldering.

The upper end of the ring core 30 and the upper flange 40a of the drum core 40 are covered with a covering member 60 made of a cured product of synthetic resin paint. Covering member 60
Is a synthetic resin paint on the tip of the linearity coil 10,
In other words, the upper end of the ring core 30 can be dipped and the synthetic resin coating material can be cured to cover it.

Second Embodiment FIG. 5 is a sectional view of a linearity coil according to a second embodiment of the present invention. The linearity coil according to this embodiment is exactly the same as the first embodiment except that a synthetic resin plate is used as the covering member 60.

Third Embodiment FIG. 6 is a sectional view of a linearity coil according to a third embodiment of the present invention. The linearity coil according to this embodiment is exactly the same as the first embodiment except that a synthetic resin cap is used as the covering member 60.

Fourth Embodiment FIG. 7 is a sectional view of a linearity coil according to a fourth embodiment of the present invention. In the linearity coil according to this embodiment, the end portion of the ring core 30 is not covered with the covering member 60, and the flange 40a of the drum core 40 and the ring core 30 are not covered.
The gap is filled with a filling member 62 made of a synthetic resin adhesive in the same manner as in the first embodiment.

Fifth Embodiment FIG. 8 is a sectional view of a linearity coil according to a fifth embodiment of the present invention. The linearity coil according to this embodiment is exactly the same as the fourth embodiment except that the gap between the flange 40a of the drum core 40 and the ring core 30 is filled with a filling member 62 made of a synthetic resin ring having a T-shaped cross section.

[0030]

According to the present invention, since foreign matter cannot enter the inside through the gap between the flange of the drum core and the ring core, conductive foreign matter adheres to the coil wound around the drum core, causing a short circuit. There is no fear, and the reliability of the electrical characteristics of the linearity coil is improved.

Further, according to the present invention, foreign matter cannot enter the interior through the gap between the flange of the drum core and the ring core, so that there is no fear that the foreign matter will cause an unpleasant sound to the linearity coil.

[Brief description of drawings]

FIG. 1 is a perspective view of a linearity coil according to a first embodiment of the present invention.

FIG. 2 is a plan view of a pedestal of the linearity coil shown in FIG.

3 is a rear view of the linearity coil of FIG. 1. FIG.

4 is a cross-sectional view of the linearity coil of FIG.

FIG. 5 is a sectional view of a linearity coil according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a linearity coil according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a linearity coil according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a linearity coil according to a fifth embodiment of the present invention.

FIG. 9 is a perspective view of an example of a conventional linearity coil.

FIG. 10 is a cross-sectional view of an example of a conventional linearity coil.

[Explanation of symbols]

 10 linearity coil 20 pedestal 20a foot 20b small protrusion 20c guide protrusion 20d recess 20e recess 20f kerf 22 lead terminal 30 ring core 40 drum core 40a flange 40b winding core 40c protrusion 50 coil 60 covering member 62 filling member

Claims (8)

[Claims] 1. A pedestal having a lead terminal on one side,
A ring core attached to the other side of the pedestal,
The ring core includes a drum core coaxially inserted into the ring core and a coil wound around the drum core. The ring core is made of a cylindrical permanent magnet, and one end of the ring core is the other of the pedestal. Is attached to the drum core, the drum core is made of a soft magnetic material having flanges at both ends of the winding core, and one of the flanges is attached to the other side of the pedestal, and the end of the coil is A linearity coil connected to the lead terminal, wherein a gap between the other flange of the drum core and the ring core is closed by a closing member. 2. The linearity coil according to claim 1, wherein the gap is covered with a covering member. 3. The linearity coil according to claim 2, wherein the covering member is made of a cured product of synthetic resin paint or synthetic resin adhesive. 4. The linearity coil according to claim 2, wherein the covering member is made of a synthetic resin plate or a synthetic resin sheet. 5. The linearity coil according to claim 2, wherein the covering member is a cap made of synthetic resin. 6. The linearity coil according to claim 1, wherein the gap is filled with a filling member. 7. The linearity coil according to claim 6, wherein the filling member is made of a cured product of a synthetic resin adhesive or a synthetic resin paint. 8. The linearity coil according to claim 6, wherein the filling member is a ring made of synthetic resin.