JP2002305112A - Linearity coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linearity coil where the leakage of magnetic flux is restrained and magnetic adverse effects which are exerted on other components at the time of mounting are restrained. SOLUTION: A magnetized part 9 is arranged only on the inner peripheral surface part of a ring core 4, and the magnetized part 9 is constituted by magnetizing an N pole on a position, facing the outer peripheral surface part of one flange 2 of a drum core 3, and magnetizing an S pole on a position facing an outer peripheral surface part of the other flange 2.

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 for various video equipment and the like.

[0002]

2. Description of the Related Art A conventional linearity coil will be described below with reference to the drawings.

FIG. 6 is a cross-sectional view of a conventional linearity coil, FIG. 7 is a perspective view of the linearity coil, and FIG. 8 is a schematic diagram showing the flow of magnetic flux in the linearity coil.

In FIG. 6 and FIG. 7, a conventional linearity coil includes a drum core 13 having flanges 12 at both ends of a winding shaft portion 11, a ring core 14 disposed outside the drum core 13, and a winding shaft portion of the drum core 13. And a terminal 17 connected to the winding 15 via a terminal plate 16.

[0005] A magnetized portion 19 is provided at the upper end and the lower end of the ring core 14, and the magnetized portion 19 is provided on the side opposite to the outer peripheral surface of one flange 12 of the Domura core 13.
The pole is magnetized, and the S pole is magnetized on the side facing the outer peripheral surface of the other flange 12.

Then, as shown in FIG. 8, the magnetized portion 19 passes through one flange 12 and the winding shaft portion 11 and the other flange 12 from the N pole to the S pole or from the S pole to the N pole. The magnetic flux 18 is generated by the winding 15.

[0007]

In the above-mentioned conventional configuration,
The magnetized portion 19 provided on the ring core 14
Are provided at the upper end and the lower end of the drum core 13, the side facing the outer peripheral surface of one flange 12 of the drum core 13 is an N pole, and the side facing the outer peripheral surface of the other flange 12 is an S pole. When the magnetic flux 18 is generated by the winding 15 so as to pass through the one flange 12 and the winding shaft portion 11 and the other flange 12 from the N pole to the S pole or from the S pole to the N pole,
8 easily leaks from the magnetized portions 19 near the upper end and the lower end of the ring core 14.

As a result, when mounted on a mounting board such as a printed board, there is a problem that other components are magnetically adversely affected.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a linearity coil which solves the above problems, suppresses magnetic flux leaking, and suppresses a magnetically adverse effect on other components during mounting.

[0010]

The present invention has the following arrangement to achieve the above object.

[0011] The invention according to claim 1 of the present invention is particularly characterized in that the ring core has a magnetized portion on the inner peripheral surface, and a non-magnetized portion on the upper surface and the lower surface, and the magnetized portion is a drum core. An N pole is magnetized on the inner peripheral surface of the ring core facing the outer peripheral surface of one flange, and an S pole is magnetized on the inner peripheral surface of the ring core facing the outer peripheral surface of the other flange. A magnetic flux is generated by the windings so as to pass through the one flange, the winding shaft, and the other flange from the N pole to the S pole or the S pole to the N pole of the magnetized portion. This is the configuration.

According to the above configuration, the ring core has a magnetized portion on the inner peripheral surface, and has a non-magnetized portion on the upper surface and the lower surface, and the magnetized portion has a ring core facing the outer peripheral surface of one flange of the drum core. The N pole is magnetized on the inner peripheral surface, and the S pole is magnetized on the inner peripheral surface of the ring core facing the outer peripheral surface of the other flange.
When the magnetic flux is generated by the winding so that the magnetic flux is generated from the pole or the south pole to the north pole so as to pass through one flange and the winding shaft portion and the other flange, the magnetic flux passes only through the ring core and the drum core. The magnetic flux leaking from the vicinity of the upper end portion or the lower end portion of the ring core is less likely to be generated.

Therefore, the leakage magnetic flux is suppressed, and the magnetic adverse effect on other components during mounting can be suppressed.

[0014] The second aspect of the present invention is the first aspect.
In the invention described above, the magnetized portion is particularly provided at a position facing only the outer peripheral surface of the flange of the drum core.

In general, in a linearity coil, since the current flowing through the winding is alternating current, repulsion and attraction between the magnetic flux generated by the winding and the magnetized portion are repeated. At this time, depending on the position of the magnetized portion, In addition, the ring core is easily displaced with respect to the drum core.

However, in the above configuration, the magnetized portion is provided only at the position facing the outer peripheral surface of the flange of the drum core, so that the ring core is unlikely to be displaced with respect to the drum core, and vibrations and the like caused by this displacement are caused. Can also be suppressed.

The third aspect of the present invention is the first aspect of the present invention.
In the described invention, the ring core and the drum core have the same center line in the height direction.

According to the above configuration, similarly to the second aspect, the ring core is less likely to be displaced with respect to the drum core, and vibrations and the like caused by this dislocation can be suppressed.

The fourth aspect of the present invention is the first aspect.
In the described invention, in particular, the material of the drum core is a Mg-based core.

According to the above configuration, the drum core is easily saturated, so that the magnetizing force of the magnetized portion of the ring core can be reduced, the leakage magnetic flux can be suppressed, and the electric adverse effect on other components during mounting can be suppressed. Can be suppressed. Further, magnetostriction of the drum core itself due to the material is unlikely to occur, and vibration caused by magnetostriction can be suppressed.

The fifth aspect of the present invention is the first aspect of the present invention.
In the described invention, in particular, the magnetized portion is provided on the inner peripheral surface portion of the ring core facing the outer peripheral surface portion of the flange of the drum core and the outer peripheral surface portion of the ring core facing the inner peripheral surface portion of the ring core. The amount of magnetization of the magnetized portion magnetized on the outer peripheral surface portion is a magnetized amount magnetized by the magnetized portion magnetized on the inner peripheral surface portion of the ring core.

According to the above configuration, a magnetic flux is generated between the magnetized portion magnetized on the outer peripheral surface portion of the ring core and the magnetized portion magnetized on the inner peripheral surface portion of the ring core, and this magnetic flux and the leaked magnetic flux are generated. Since they are generated in opposite directions, they cancel each other out, and the amount of magnetic flux leaking as a whole can be reduced.

According to the sixth aspect of the present invention, the fifth aspect is provided.
In the invention described, in particular, the amount of magnetization of the magnetized portion magnetized on the outer peripheral surface of the ring core is larger than the amount of magnetized by the magnetized portion magnetized on the inner peripheral surface of the ring core. Is smaller than the amount of magnetization of the magnetized portion magnetized on the inner peripheral surface portion.

With the above structure, a stronger magnetic flux is generated between the magnetized portion magnetized on the outer peripheral surface of the ring core and the magnetized portion magnetized on the inner peripheral surface of the ring core, and the magnetic flux leaks. Since the magnetic flux is generated in the opposite direction to the magnetic flux, the magnetic flux cancels each other and the amount of magnetic flux leaking as a whole can be further reduced.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment) The invention described in all claims of the present invention will be described below using an embodiment with reference to the drawings.

FIG. 1 is a sectional view of a linearity coil according to an embodiment of the present invention, FIG. 2 is a perspective view of the linearity coil, and FIG. 3 is a schematic diagram showing a flow of a magnetic flux of the linearity coil.

1 and 2, a linearity coil according to an embodiment of the present invention includes a drum core 3 having flanges 2 at both ends of a winding shaft portion 1, a ring core 4 disposed outside the drum core 3, and A winding 5 wound around the winding shaft 1 of the drum core 3 and a terminal 7 connected to the winding 5 via a terminal plate 6 are provided. The material of the drum core 3 is an Mg-based core. The ring core 4 and the drum core 3 are arranged such that the center lines O in the height direction of the drum core 3 coincide with each other.

The ring core 4 has a magnetized portion 9 on its inner peripheral surface.
And a non-magnetized portion 10 on the upper surface and the lower surface.
The magnetized portion 9 is provided on the inner peripheral surface of the ring core 4 which faces the outer peripheral surface of the one flange 2 of the drum core 3.
The pole is magnetized, and the S pole is magnetized on the inner peripheral surface of the ring core 4 facing the outer peripheral surface of the other flange 2. At this time, the magnetized portion 9 is provided at a position facing only the outer peripheral surface of the flange 2 of the drum core 3, and apparently the ring core 4 is disassembled into three magnets surrounded by dotted lines.

Then, as shown in FIG.
One pole 2 from the pole to the S pole or from the S pole to the N pole
The magnetic flux 8 is generated by the winding 5 so as to pass through the winding shaft 1 and the other flange 2.

Regarding the linearity coil having the above configuration,
The operation will be described below.

With the above configuration, the ring core 4 is provided with the magnetized portion 9 on the inner peripheral surface and the non-magnetized portion 10 on the upper surface and the lower surface.
The N pole is magnetized on the inner peripheral surface of the ring core 4 facing the outer peripheral surface of the one flange 2, and the S pole is magnetized on the inner peripheral surface of the ring core 4 facing the outer peripheral surface of the other flange 2. Therefore, from the N pole of the magnetized portion 9 to the S pole or from the S pole to N
When the magnetic flux 8 is generated by the winding 5 so as to pass through the one flange 2, the winding shaft portion 1, and the other flange 2 toward the pole, the magnetic flux 8 also passes only inside the ring core 4 and the drum core 3. The magnetic flux easily passes, and magnetic flux leaking from the vicinity of the upper end or the lower end of the ring core 4 is less likely to be generated.

Accordingly, the leakage magnetic flux 8 is suppressed, and the adverse magnetic effect on other components during mounting can be suppressed.

In general, in a linearity coil, the current flowing through the winding 5 is an alternating current, and thus the repulsion and attraction of the magnetic flux 8 generated by the winding 5 and the magnetized portion 9 are repeated. Depending on the position of the magnetic part 9, the drum core 3
However, since the ring core 4 is likely to be displaced, the magnetized portion 9 is provided only at the position facing the outer peripheral surface of the flange 2 of the drum core 3. In addition, vibrations and the like caused by this displacement can be suppressed.

In particular, since the center lines of the ring core 4 and the drum core 3 in the height direction are made coincident with each other, the ring core 4 is less likely to be displaced with respect to the drum core 3, and vibrations and the like caused by this displacement are further reduced. Can also be suppressed.

Further, since the material of the drum core 3 is a Mg-based core, the drum core 3 is likely to be saturated.
The magnetizing force of the magnetized portion 9 of the ring core 4 can be reduced, the leakage magnetic flux 8 can be suppressed, and the magnetic adverse effect on other components during mounting can be suppressed.
Magnetostriction of the drum core itself due to the material is unlikely to occur, and vibration caused by magnetostriction can be suppressed.

As described above, according to the embodiment of the present invention, the leakage magnetic flux 8 is suppressed, the magnetic adverse effect on other components can be suppressed at the time of mounting, and the drum core 3 The ring core 4 is less likely to be displaced, and vibrations and the like caused by this dislocation can be suppressed.

The magnetized portion 9 for magnetizing the ring core 4 includes an inner peripheral surface of the ring core 4 facing the outer peripheral surface of the flange 2 of the drum core 3 and an outer peripheral surface of the ring core 4 facing the inner peripheral surface of the ring core 4. And the amount of magnetization of the magnetized portion 9 magnetized on the outer peripheral surface of the ring core 4 may be the amount of magnetization magnetized by the magnetized portion magnetized on the inner peripheral surface of the ring core 4. In this case, as shown in FIG. 4, a magnetic flux 8 indicated by a dotted line is generated between a magnetized portion 9 magnetized on the outer peripheral surface of the ring core 4 and a magnetized portion 9 magnetized on the inner peripheral surface of the ring core 4. At the same time, the magnetic flux 8 indicated by the dotted line is generated in the direction opposite to the magnetic flux 8 to be leaked, so that the magnetic flux 8 cancels each other and the amount of magnetic flux to be leaked can be reduced as a whole.

Further, the amount of magnetization of the magnetized portion 9 magnetized on the outer peripheral surface of the ring core 4 is larger than the amount of magnetized by the magnetized portion 9 magnetized on the inner peripheral surface of the ring core 4.
The magnetization amount of the magnetized portion 9 magnetized on the inner peripheral surface of the ring core 4 may be smaller. In this case, as shown in FIG.
Between the magnetized portion 9 magnetized on the outer peripheral surface portion of the ring core 4 and the magnetized portion 9 magnetized on the inner peripheral surface portion of the ring core 4, the magnetic flux 8 indicated by the dotted line is generated more strongly, and the magnetic flux indicated by the dotted line is generated. 8 are generated in the direction opposite to the leaked magnetic flux 8, and thus cancel each other out, and as a whole, the leaked magnetic flux 8 is generated.
Can be further reduced.

[0039]

As described above, according to the present invention, the ring core has a magnetized portion only on the inner peripheral surface portion, and the magnetized portion has the N pole at a position opposed to the outer peripheral surface portion of one flange of the drum core. Since the magnetic pole is magnetized and the S pole is magnetized at a position facing the outer peripheral surface portion of the other flange, the magnetized portion is changed from N pole to S pole or S pole to N pole.
When the magnetic flux is generated by the winding so as to pass through the one flange, the winding shaft portion, and the other flange toward the pole, the magnetic flux easily passes only through the inside of the ring core and the drum core, and the upper end of the ring core. It is difficult to leak from near the bottom or near the lower end.

Accordingly, it is possible to provide a linearity coil in which the leakage magnetic flux is suppressed and the magnetically adverse effect on other components during mounting is suppressed.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of the linearity coil.

FIG. 3 is a schematic diagram showing a flow of a magnetic flux of the linearity coil.

FIG. 4 is a schematic diagram showing a flow of a magnetic flux of another linearity coil.

FIG. 5 is a schematic diagram showing a flow of a magnetic flux of another linearity coil.

FIG. 6 is a sectional view of a conventional linearity coil.

FIG. 7 is a perspective view of the linearity coil.

FIG. 8 is a schematic diagram showing a flow of a magnetic flux of the linearity coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding shaft part 2 Flange 3 Drum core 4 Ring core 5 Winding 6 Terminal plate 7 Terminal 8 Magnetic flux 9 Magnetized part 10 Non-magnetized part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Momoi 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Koji Hirose 1006 Kadoma Kazuma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Takashi Kagoshima 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5E058 BB19 5E070 AA01 AA20

Claims (6)

[Claims] 1. A drum core having flanges at both ends of a winding shaft, a ring core disposed outside the drum core, a winding wound around the winding shaft of the drum core, and a terminal connected to the winding. The ring core has a magnetized portion on an inner peripheral surface portion and a non-magnetized portion on an upper surface portion and a lower surface portion, and the magnetized portion faces an outer peripheral surface portion of one of the flanges of the drum core. An N pole is magnetized on the inner peripheral surface of the ring core, and an S pole is magnetized on the inner peripheral surface of the ring core facing the outer peripheral surface of the other flange. From pole to S pole or from S pole to N
A linearity coil in which a magnetic flux is generated by the winding so as to pass through one of the flanges, the winding shaft portion, and the other flange toward a pole. 2. The linearity coil according to claim 1, wherein the magnetized portion is provided at a position facing only the outer peripheral surface of the flange of the drum core. 3. The linearity coil according to claim 1, wherein the center lines of the ring core and the drum core in the height direction coincide with each other. 4. The linearity coil according to claim 1, wherein the material of the drum core is an Mg-based core. 5. A magnetized portion is provided on an inner peripheral surface of a ring core facing an outer peripheral surface of a flange of a drum core and an outer peripheral surface of the ring core facing the inner peripheral surface of the ring core, and the outer peripheral surface of the ring core. 2. The linearity coil according to claim 1, wherein the amount of magnetization of the magnetized portion magnetized on the inner surface of the ring core is magnetized by the magnetized portion magnetized on the inner peripheral surface portion of the ring core. 3. 6. The amount of magnetization of the magnetized portion magnetized on the outer peripheral surface of the ring core is larger than the amount of magnetized by the magnetized portion magnetized on the inner peripheral surface of the ring core. 6. The linearity coil according to claim 5, wherein the amount of magnetization of the magnetized portion magnetized on the inner peripheral surface is smaller than that of the magnetized portion.