JPH09135493A - Repulsion magnetic circuit and production of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs for production and the costs of expendable tools by simplifying a jig for magnetization without the danger of mutually facing the different poles of both magnets when producing a repulsive magnetic circuit. SOLUTION: When production the repulsion magnetic circuit constituted by arranging two magnets 2 and 2 so as to face the same pole each other and arranging a center plate 3 composed of a magnetic substance between both the magnets, two half magnetic circuit parts 1A and 1B are constituted by adhesive bonding divided plate members 3a and 3b, for which the center plate 3 is bisected in the direction of crossing axis, to both the respective magnets 2 and 2 and both the half magnetic circuit parts are coupled and built up by bonding the divided plate members 3a and 3b each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repulsive magnetic circuit constructed by arranging two magnets with the same poles facing each other and a center plate made of a magnetic material between the magnets, and a method of manufacturing the same. Regarding

[0002]

2. Description of the Related Art In order to reduce the thickness of a speaker, as shown in FIG. 8, two magnets 12 and 12 are arranged so that the same poles face each other, and a center made of a magnetic material is provided between the magnets 12 and 12. There is a speaker in which the plate 13 is arranged to form the repulsive magnetic circuit 11, and the voice coil V is arranged in the repulsive magnetic field generated on the outer periphery of the center plate 13.

In the conventional repulsive magnetic circuit, as shown in FIGS. 8 and 9, the magnets 12 and 12 and the center plate 13 are both ring-shaped, and the center pole 15 of the holder 14 is inserted into the center hole to mount the magnet. It is fixed with a screw 16 or is fixed to the holder 14 with a mounting screw 16 in a state where a center pole 15 which is a separate member is inserted into the center hole.

The conventional type has only one center plate 13, and when magnetizing the magnets 12, 12, it is complicated to magnetize the magnets 12 in the assembled state as shown in FIGS. 8 and 9. Since it is not realistic, a method of using a magnet magnetized in advance to sandwich the center plate 13 therebetween, or one magnet 12 in a magnetized state and the center plate 13 on one surface of the other magnet A method is employed in which the one magnet is joined to the center plate 13 by magnetizing in a state of being adhered and fixed.

[0005]

However, in any of the conventional methods, since the magnet alone is magnetized in any of the methods, the magnetic field direction of the magnet cannot be determined after the magnet is taken out from the magnetizing device. There is a possibility that erroneous work such as facing different poles at the stage of assembling the magnetic circuit may occur.

In order to prevent such an erroneous operation, it is necessary to perform marking for indicating the magnetic field direction before taking out from the magnetizing device, or to confirm the magnetic field method by another magnetized object during the assembling work. However, there was a drawback that the man-hour increased.

Further, in the latter magnetizing method, different jigs or the like are required because the magnetized forms are different, which increases the manufacturing cost and may cause erroneous manufacturing. Further, since a center hole is provided in the magnet and the center plate and centering (positioning) is performed by the center pole, accuracy is required for the inner diameter of the center hole and the outer diameter of the center pole, resulting in an increase in manufacturing cost.

Therefore, an object of the present invention is to eliminate the risk of erroneous manufacturing in which different poles of both magnets face each other when manufacturing a repulsive magnetic circuit, and to simplify a magnetizing jig or the like. An object of the present invention is to provide a repulsive magnetic circuit and a manufacturing method thereof, which can reduce the above cost loss and the cost of consumable tools.

[0009]

In order to achieve the above object, the repulsive magnetic circuit of the present invention has two magnets arranged so that the same poles face each other, and a center plate made of a magnetic material is provided between both magnets. Arranged and configured,
In the repulsive magnetic circuit of the speaker in which the voice coil is arranged in the repulsive magnetic field generated on the outer periphery of the center plate, the center plate is divided into split plates in the cross axis direction, and the split plates are joined together. ing.

The method for manufacturing a repulsive magnetic circuit according to the present invention is constructed by disposing two magnets so that the same poles face each other and disposing a center plate made of a magnetic material between both magnets. In a method of manufacturing a repulsive magnetic circuit for a speaker in which a voice coil is arranged in a repulsive magnetic field generated on the outer periphery of a plate, a divided plate material in which the center plate is divided into two in the cross axis direction is adhered to each magnet. This is a method in which two half-divided magnetic circuit portions are joined together to form two half-divided magnetic circuit portions, and the divided plate materials are joined to join the two half-divided magnetic circuit portions.

In this case, as a magnetizing method, a magnet is pre-magnetized and a divided plate material is adsorbed and bonded to the magnet to form a half-divided magnetic circuit portion, and a magnet in a non-magnetized state is divided into plates. There is a method of joining materials and magnetizing the magnet in this state to form a half-removed magnetic circuit section.

As an assembly mode, one half-cut magnetic circuit portion is inserted into a guide jig that guides the outer diameter of the split plate material, and the other half-cut magnetic circuit portion is inserted on the guide jig so that both split plate materials are inserted. Can be adhesively bonded. For this reason, even if the magnet and the split plate member are disc-shaped without a central hole, they can be assembled easily and reliably.

Further, when the magnet and the split plate material have a central hole, the split plate materials are joined and fixed with a tightening screw, or the split plate materials are riveted through the central hole of the magnet and the split plate material. It is also possible to fix the connection.

[0014]

FIG. 1 shows an embodiment of a repulsive magnetic circuit 1 according to the present invention, in which a center plate 3 is arranged between magnets 2 and 2 having the same poles opposed to each other. The center plate 3 is divided into two in the intersecting axis direction, that is, in the horizontal direction in the drawing.
It has a form in which a and 3b are joined.

The method of manufacturing the repulsive magnetic circuit 1 will be described with reference to FIGS.
As shown in FIG. 7, the center plate 3 is divided into two in the intersecting axis direction, that is, in the horizontal direction in the drawing.
Adhesively bonded to each of the two half-removed magnetic circuit units 1A,
1B is formed, and the split plate members 3a and 3b are joined to each other to join and assemble the half magnetic circuit portions 1A and 1B.

In the repulsive magnetic circuit 1 of the present invention, there are the following two magnetization methods. First, the magnets 2 and 2 are magnetized, and then the split plate members 3a and 3b are joined to one surface of each of the magnets 2 and 2 to form the half-removed magnetic circuit 1.
A is a method of manufacturing A and 1B, and a second method is to divide the plate members 3a and 3a into the magnets 2 and 2 which are not magnetized.
b are joined together with an adhesive to form the semi-removed magnetic circuit units 1A, 1
This is a method in which B is assembled and magnetized in this shape. In addition,
In the first method, the split plate members 3a and 3b are adsorbed and joined to the magnets 2 and 2 by their magnetic force, but they are fixed with an adhesive in order to ensure the alignment and the joining and fixing.

The repulsive magnetic circuit 1 is manufactured by connecting the half-removed magnetic circuits 1A and 1B assembled as described above in the form of joining the divided plate members 3a and 3b.
In this state, the split plate members 3a and 3b of the semi-removed magnetic circuits 1A and 1B have already repelled each other, so a guide jig G as shown in FIG. 5 is used. The guide jig G guides the outer diameters of the divided plate members 3a and 3b. One half-removed magnetic circuit portion 1A is inserted into the guide jig G, and the other half-removed magnetic circuit portion 1B is placed on the guide jig G. The two divided plate members 3a and 3b are inserted and bonded to each other.

Therefore, even if the magnets 2 and 2 and the division plate members 3a and 3b are disk-shaped without a central hole, they can be assembled easily and surely, and FIG.
As indicated by the broken line, even if the magnets 2 and 2 have the central hole only, as in the case where the conventional magnets are used as they are, they can be surely assembled.

When the magnets 2 and 2 and the split plate members 3a and 3b have a central hole, as shown in FIGS.
As shown in FIG. 3, the split plate members 3a and 3b are joined and fixed with a tightening screw 4, or the split plate members 3a and 3b are inserted through the central holes of the split plate members 3a and 3b.
It is also possible to fix the a and 3b together with the rivet 5. In this case, since the center pole is not used for centering as in the conventional case, it is possible to fix the center pole without requiring so much accuracy.

[0020]

The half-removed magnetic circuit portions 1A and 1B are formed by using the divided plate members 3a and 3b obtained by dividing the center plate 3 into two, and the repulsive magnetic circuit 1 is manufactured by connecting the half-removed magnetic circuit portions 1A and 1B. Therefore, the magnetic direction is clear, and there is no need for work for confirming the magnetic direction or a confirmation jig as in the conventional case.

Further, in the conventional process, when the center plate is joined to the magnet and then the magnetized magnets are joined, the repulsion between the magnets is strong and it is difficult to align the second magnet with the center of the center plate. Although it has undergone a troublesome process, the semi-removed magnetic circuit unit 1A,
In the form in which 1B is connected, it can be easily done by using a guide jig G or the like.

Further, conventionally, it is indispensable to provide a center hole in the magnet and the center plate for alignment, but if the center hole is provided, a loss in performance may occur in the volume of the magnet. In this respect, the method of connecting the half-removed magnetic circuits 1A and 1B does not require a central hole,
There is no loss in the volume of the magnets 2 and 2.

Further, in the conventional structure, accuracy is required for the center holes and center poles of the magnet and the center plate, but in the present invention, the guide plate G is used to guide the division plate members 3a, 3b for alignment. Therefore, since the accuracy is not so high, the manufacturing process becomes extremely easy.

[0024]

According to the repulsive magnetic circuit and the method of manufacturing the same of the present invention, the following effects can be obtained. (1) Since the magnetic field direction is not erroneously manufactured, the manufacturing loss can be reduced. (2) Since the magnetizing shape is a single shape, the jig can be simplified and the manufacturing cost can be reduced. (3) Since the magnetic circuit components can be unified, management can be simplified. (4) A magnetic circuit can be easily formed even with a cylindrical magnet and a center plate having no central hole. (5) Even if a ring-shaped magnet and a center plate are used, dimensional accuracy is not required so much, and it can be manufactured at low cost. (6) There is no difference in performance from the one using one center plate.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a repulsive magnetic circuit of the present invention.

FIG. 2 is a cross-sectional view showing a half magnetic circuit unit.

FIG. 3 is a cross-sectional view showing an example in which a magnet and a split plate member have a central hole.

FIG. 4 is a perspective view of a semi-removed magnetic circuit unit having a central hole in a magnet and a division plate material.

FIG. 5 is a cross-sectional view showing an example of assembling the semi-removed magnetic circuit unit using a guide jig.

FIG. 6 is a cross-sectional view showing an example in which the semi-removed magnetic circuit unit is connected and fixed with a tightening screw.

FIG. 7 is a cross-sectional view showing an example in which the semi-removed magnetic circuit unit is connected and fixed with rivets.

FIG. 8 is a sectional view showing a conventional repulsive magnetic circuit.

FIG. 9 is a sectional view showing another fixing means of the conventional repulsive magnetic circuit.

[Explanation of symbols]

 1 Repulsive magnetic circuit 2 Magnet 3 Center plate 3a Divided plate material 3b Divided plate material 4 Tightening screw 5 Rivet G Guide jig

Claims (9)

[Claims] 1. A voice coil is constructed by arranging two magnets so that the same poles face each other, and arranging a center plate made of a magnetic material between both magnets, in a repulsive magnetic field generated on the outer periphery of the center plate. In the repulsive magnetic circuit of the speaker arranged as described above, the center plate is constituted by joining divided plates divided in the cross axis direction. 2. A voice coil is formed by arranging two magnets so that the same poles face each other, and arranging a center plate made of a magnetic material between both magnets, and in a repulsive magnetic field generated on the outer periphery of the center plate. In a method for manufacturing a repulsive magnetic circuit for a speaker, the split plate material in which the center plate is split into two in the cross axis direction is adhesively bonded to each of the two magnets to form two half-removed magnetic circuit parts. A method for manufacturing a repulsive magnetic circuit, characterized in that the split plate members are joined together to assemble the two half-removed magnetic circuit units. 3. The method of manufacturing a repulsive magnetic circuit according to claim 2, wherein the magnet is pre-magnetized and the divided plate material is adsorbed and bonded to the magnet to form the half-reciprocal magnetic circuit section. 4. A repulsive magnetic circuit according to claim 2, wherein the split plate member is joined to a magnet in a non-magnetized state, and the magnet is magnetized in this state to form a semi-reverse magnetic circuit section. Method. 5. The method of manufacturing a repulsive magnetic circuit according to claim 2, wherein the magnet and the division plate material are disk-shaped without a central hole. 6. One half-removed magnetic circuit portion is inserted into a guide jig for guiding the outer diameter of the divided plate material, and the other half-removed magnetic circuit portion is inserted onto the guide jig so that both divided plate materials are adhesively joined. 3. The method for manufacturing a repulsive magnetic circuit according to claim 2. 7. The method of manufacturing a repulsive magnetic circuit according to claim 2, wherein the divided plate members are bonded to each other with an adhesive. 8. The method of manufacturing a repulsion magnetic circuit according to claim 2, wherein the magnet and the split plate member are provided with a central hole, and the split plate members are coupled and fixed to each other with a tightening screw. 9. The method of manufacturing a repulsion magnetic circuit according to claim 2, wherein a center hole is provided in the magnet and the split plate material, and the split plate materials are coupled and fixed to each other with a rivet.