JPH099376A - Repulsion magnetic circuit type speaker - Google Patents

Abstract

PURPOSE: To provide the repulsion magnetic circuit type speaker in which a cylindrical magnet is usable, no exclusive jig or the like is required for the assembling, the assembling man-hours are reduced and the cost is decreased. CONSTITUTION: A repulsion magnetic circuit 1 consisting of two magnets 2, 2 arranged so that the same poles are opposite to each other and a center plate 3 made of a magnetic material arranged between both the magnets is used and a voice coil 14 is arranged in a repulsion magnetic field caused at the outer circumference of the center plate 3. In the repulsion magnetic circuit type speaker as above, the coupling state of the magnetic 2, 2 and the center plate 3 being components of the repulsion magnetic circuit 1 is supported by a holder member 4 arranged at the outer circumference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker using a repulsive magnetic circuit, and more particularly to a speaker having an improved holding structure for the repulsive magnetic circuit.

[0002]

2. Description of the Related Art Conventionally, a center plate using a repulsive magnetic circuit composed of two magnets arranged so that the same poles face each other and a center plate made of a magnetic material arranged between the magnets. There is a repulsive magnetic circuit type speaker in which a voice coil is arranged in the repulsive magnetic field generated on the outer periphery of the speaker. We have proposed and implemented various repulsive magnetic circuits and speakers.

FIG. 3 is a half cross-sectional view of a conventional repulsive magnetic circuit type loudspeaker. It is composed of two magnets 12, 12 arranged so that the same poles face each other and a magnetic material arranged between the two magnets 12, 12. The repulsive magnetic circuit 11 is constituted by the center plate 13 and the voice coil 14 is arranged in the repulsive magnetic field generated on the outer periphery of the center plate 13 by using the repulsive magnetic circuit 11.

In the figure, 15 is a damper, 16 is a diaphragm, 17 is a speaker frame, and 19 is a terminal plate. In order to support the repulsive magnetic circuit 11, the magnets 12 and 12 and the center plate 13 are formed in a donut shape, and a holder 18 is inserted into the center of the doughnut-shaped and fixed with a tightening screw 20.

[0005]

Generally, a toroidal magnet is more expensive than a cylindrical magnet because of its complicated shape, but the conventional one has a repulsion magnetic circuit 1.
Since the magnets 12 and 12 and the center plate 13 are of a donut shape as a structure for supporting 1, the cylindrical magnet cannot be used, and there is a drawback that the cost becomes high.

[0006] In assembly, they repel each other 2
A dedicated jig is used to hold the state in which the two magnets 12, 12 and the center plate 13 are combined, and the speaker frame 1 is held in a state of being integrally held by the dedicated jig.
Since it has to be attached to No. 7, a dedicated jig is required and a pre-assembly process is required, which makes it difficult to reduce the cost.

An object of the present invention is to solve the above-mentioned conventional drawbacks, to use a columnar magnet, to eliminate the need for a dedicated jig or the like when assembling, and to reduce the number of assembling steps. An object of the present invention is to provide a repulsive magnetic circuit type speaker that can be manufactured and can reduce costs.

[0008]

In order to achieve the above-mentioned object, the present invention comprises two magnets arranged so that the same poles face each other, and a center plate made of a magnetic material arranged between the two magnets. In the repulsive magnetic circuit type speaker using the repulsive magnetic circuit configured and arranging the voice coil in the repulsive magnetic field generated on the outer periphery of the center plate, the combination state of the magnet and the center plate constituting the repulsive magnetic circuit is It is held by a holder member arranged on the outer peripheral surface.

The holder member has a magnet holder part made of a non-magnetic material located on the outer peripheral surface of the magnet and a plate holder part made of a magnetic material located on the outer peripheral surface of the center plate, and has a hybrid structure of the non-magnetic material and the magnetic material. It is integrally molded with the material.

Further, the holder member can be integrally formed with the speaker frame, or the coaxial support portion provided on the upper part of the repulsive magnetic circuit and the holder member can be integrally formed, thereby reducing the number of parts and assembling process. It is possible to simplify.

[0011]

Since the structure is such that the magnet constituting the repulsion magnetic circuit and the center plate are held together by the holder member arranged on the outer peripheral surface thereof, it is possible to use a columnar magnet which is lower in cost than the donut type. You can
Cost reduction becomes possible.

Further, the holder member is composed of a magnet holder part made of a non-magnetic material located on the outer peripheral surface of the magnet and a plate holder part made of a magnetic material located on the outer peripheral surface of the center plate. By integrally molding with a structural material, the holder portion can be designed to have a wall thickness sufficient to obtain sufficient strength, and the magnetic flux density on the outer periphery of the center plate can be secured.

Further, the holder member is integrally formed with the speaker frame, or the coaxial support portion provided on the upper part of the repulsive magnetic circuit is integrally formed with the holder member, so that the assembly is facilitated and the bottom portion of the holder member is easily formed. If the opening is provided, the magnetic circuit component can be loaded from the lower surface side, and the assembling process can be simplified.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a repulsive magnetic circuit type speaker according to the present invention will be described with reference to FIGS. 1 and 2. The same components as those of the conventional repulsive magnetic circuit type speaker described with reference to FIG. 3 are the same. And the detailed description thereof will be omitted. FIG. 1 is a cross-sectional view of a repulsive magnetic circuit type speaker, and FIG. 2 is a half-divided cross-sectional view showing another configuration example. In the figure, 1 is a repulsive magnetic circuit, and circles arranged so that the same poles face each other. A columnar magnet 2 and a disk-shaped center plate 3 made of a magnetic material and arranged between the magnets 2 and 2.
And a repulsive magnetic field is generated on the outer periphery of the center plate 3, and the voice coil 14 is arranged in the repulsive magnetic field.

Reference numeral 4 denotes a holder member for holding the combined state of the magnets 2 and 2 and the center plate 3 on the outer peripheral surface thereof. In the example of FIG. 1, the holder member has a cylindrical shape with a lid and a speaker at the opening edge on the bottom surface side. A mounting portion 5 for the frame 7 is provided, and is entirely made of a non-magnetic material. The magnets 2, 2 and the center plate 3 between them are dropped into the cylindrical portion, and the speaker frame 7 is mounted with screws 5a. As a result, the magnets 2 and 2 and the center plate 3 are pressed and held by the convex portion 7a provided on the bottom surface side of the speaker frame 7.

Although the magnets 2 and 2 and the center plate 3 are pressed by the convex portion 7a on the bottom surface side of the speaker frame 7 in the embodiment, another member having such a convex portion is formed to form this member. May be attached to the bottom surface side of the speaker frame 7 and pressed. Further, in the embodiment, the damper 15 is a conductive damper having a conductive portion 15a for signal input provided on the front surface side, and the end portion of the conductive portion 15a is connected to the terminal board 19.

In the example shown in FIG. 2, the holder member 4 is a magnet holder portion 4a, 4b made of a non-magnetic material located on the outer peripheral surface of the magnet 2 and a plate holder portion made of a magnetic material located on the outer peripheral surface of the center plate 3. 4c, and is integrally molded of a hybrid structure material of a non-magnetic material and a magnetic material.

If the holder member 4 is thick, the voice coil 14
Cannot be arranged in a magnetic field having a high magnetic flux density because it goes away from the center plate 3. For this reason, it is desirable that the holder member 4 be made of a thin material, but on the other hand, the holder member 4 needs to have a certain thickness in order to secure the strength for securely holding the magnets 2, 2 and the center play 3. Become. Therefore, the plate holder 4
If only c is made of a magnetic material,
The magnets 2 and 2 and the center plate 3 can be designed with a material thickness that can reliably hold the required magnetic flux, and the degree of freedom in design is increased.

Further, in the embodiment shown in FIG. 2, a coaxial support portion 6 is provided on the upper side of the magnet holder portion 4a located on the upper side in the drawing so that the tweeter unit can be mounted, and the support portion is also provided. 6 is formed integrally with the magnet holder portion 6, and the magnet holder portion 4b located on the lower side and the speaker frame 7 are formed integrally.

In this configuration example, since the bottom side of the holder member 4 is opened, another member 7b having a convex portion similar to the convex portion 7a is formed and attached to the bottom surface side of the speaker frame 7. With this configuration, the magnetic circuit component can be inserted from below the speaker frame 7 and assembled.

That is, conventionally, as is clear from FIG. 3, the magnetic circuit components must be assembled from above the speaker frame 7 in the drawing. In this case, the diaphragm 1 is used.
Be sure to assemble before 6. On the other hand, in the configuration example of FIG. 2, since the speaker frame 7 can be assembled from below, it can be performed regardless of the assembly of the diaphragm 16, and the degree of freedom in setting the assembly process is high.

[0022]

According to the present invention, it is possible to use a columnar magnet which is lower in cost than the donut type, and the cost can be reduced. Further, if the outer diameter is the same, the cylindrical magnet has a larger volume of the magnet and the magnetic flux also increases.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a repulsive magnetic circuit type speaker according to the present invention.

FIG. 2 is a half cross-sectional view showing another configuration example of the repulsive magnetic circuit type speaker according to the present invention.

FIG. 3 is a half cross-sectional view showing a conventional repulsive magnetic circuit type speaker.

[Explanation of symbols]

 1 Repulsive magnetic circuit 2 Magnet 3 Center plate 4 Holder member 4a, 4b Magnet holder part 4c Plate holder part 5 Mounting part 6 Coaxial support part 7 Speaker frame 14 Voice coil

Claims (4)

[Claims] 1. The two electrodes are arranged so that the same poles face each other.
A repulsive magnetic circuit type speaker in which a repulsive magnetic circuit including one magnet and a center plate made of a magnetic material disposed between both magnets is used, and a voice coil is arranged in a repulsive magnetic field generated on the outer periphery of the center plate. 2. A repulsive magnetic circuit type speaker according to claim 1, wherein the magnet and the center plate constituting the repulsive magnetic circuit are held by a holder member arranged on the outer peripheral surface thereof. 2. The holder member comprises a magnet holder part made of a non-magnetic material located on the outer peripheral surface of the magnet and a plate holder part made of a magnetic material located on the outer peripheral surface of the center plate. The repulsive magnetic circuit type speaker according to claim 1, wherein the speaker is integrally formed of a hybrid structure material. 3. The repulsive magnetic circuit type speaker according to claim 1, wherein the holder member is integrally formed with the speaker frame. 4. A support part for coaxial is provided on an upper part of the repulsive magnetic circuit, and the support part and a holder member are integrally molded.
The repulsive magnetic circuit type speaker according to 2.