WO2019180987A1 - Exciter - Google Patents

Abstract

Provided is an exciter that enables a rolling phenomenon to be suppressed without uniformly disposing dampers around a magnetic circuit, and that is useful for reducing the size of a frame. An exciter 1 comprises: a frame 2 having a substantially rectangular parallelepiped shape; a magnetic circuit 3; and a plurality of dampers 4 that connect the magnetic circuit 3 and the frame 2. The dampers 4, which join the magnetic circuit 3 and the frame 2, are joined by stabilizers 21.

Description

Exciter

The present invention relates to an exciter.

The exciter includes a magnetic circuit including a yoke and a magnet, and a damper that connects the magnetic circuit and the frame. Generally, an exciter is round, that is, includes a cylindrical frame having a diameter larger than that of a substantially cylindrical magnetic circuit, and a plurality of dampers are arranged at intervals in the circumferential direction of the magnetic circuit. (For example, refer to FIGS. 6 and 7 of Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-76763

By the way, the conventional configuration employs a round shape in which dampers can be evenly arranged around the magnetic circuit so that the magnetic circuit does not vibrate off the central axis.
However, in the configuration in which the dampers are evenly arranged around the magnetic circuit, the outer size of the exciter becomes large, and there is a possibility that it cannot be arranged in the arrangement space. For example, a situation in which the frame does not fit in a space that is only as wide as the diameter of the magnetic circuit occurs. On the other hand, if the dampers are not evenly arranged around the magnetic circuit, a rolling phenomenon, which is vibration in the rotational direction around the damper, will occur.

Therefore, an object of the present invention is to provide an exciter that suppresses the rolling phenomenon and is advantageous for reducing the size of the frame without evenly arranging the dampers around the magnetic circuit.

This specification includes all the contents of Japanese Patent Application No. 2018-051098 filed on Mar. 19, 2018.
In order to achieve the above object, an exciter of the present invention connects a magnetic circuit including a yoke and a magnet, a plurality of dampers connecting the magnetic circuit and a frame, and any one of the plurality of dampers. And a stabilizer.

In the above configuration, each damper may have a curved portion that curves toward another adjacent damper, and the stabilizer may connect the curved portions.

In the above configuration, the stabilizer may extend linearly along the direction in which the dampers are adjacent to each other and connect the adjacent dampers.

In the above configuration, the stabilizer may connect the central portion of each damper.

In the above configuration, the magnetic circuit is provided with a pair of dampers on both sides along a predetermined direction in plan view, and each pair of the dampers has a curved portion that curves to the mating counterpart. Each curved portion may be connected by the stabilizer.

In the above configuration, the frame may have a non-circular shape having the predetermined direction as a longitudinal direction in plan view, and may have a frame shape in which the damper cannot be disposed on both sides of the magnetic circuit perpendicular to the longitudinal direction.

According to the present invention, it is possible to provide an exciter advantageous in reducing the size of the frame by suppressing the rolling phenomenon without evenly arranging the dampers around the magnetic circuit.

FIG. 1 is a perspective view of an exciter according to an embodiment of the present invention. FIG. 2 is a side cross-sectional view of the exciter in a stationary state. FIG. 3 is a side sectional view of the exciter in a vibrating state. FIG. 4 is a plan view of the exciter. FIG. 5 is a perspective view of a conventional exciter. FIG. 6 is a diagram showing a simulation result of the exciter.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of an exciter 1 according to an embodiment of the present invention. 2 is a side sectional view of the exciter 1 in a stationary state, and FIG. 3 is a side sectional view of the exciter 1 in a vibrating state. In the drawing, the symbol Z indicates the vibration direction of the exciter 1.
As shown in FIGS. 1 and 2, the exciter 1 includes a substantially rectangular parallelepiped frame 2, a magnetic circuit 3 (also referred to as a vibrating body), and a plurality of pieces (in this configuration, connecting the magnetic circuit 3 and the frame 2). 4) dampers 4 are provided.

The frame 2 is a hollow frame extending along the X direction shown in FIG. 1 and the like, and the X direction is the longitudinal direction and the Y direction is the short direction. More specifically, the frame 2 is formed in a cylindrical frame having a rectangular opening extending in the X direction. The X direction and the Y direction are directions along a plane orthogonal to the Z direction. The frame 2 holds a magnetic circuit 3 via a damper 4 on one side in the Z direction (upper side in FIG. 1). The material of the frame 2 is not particularly limited. For example, the frame 2 is formed into a frame having sufficient rigidity with a metal material or a resin material.

As shown in FIG. 2, the magnetic circuit 3 is configured by sequentially stacking a yoke 31, a disk-shaped magnet 32, and a plate 33 in the Z direction. The yoke 31 is formed in a bottomed cylindrical shape, the disk-shaped magnet 32 is overlaid on the center of the inner bottom surface of the yoke 31, and the plate 33 is overlaid on the disk-shaped magnet 32.
The plate 33 is also formed in a disk shape like the disk-shaped magnet 32, but its diameter is slightly larger than the diameter of the disk-shaped magnet 32. Further, the yoke 31 is formed to have a larger diameter than the disk-shaped magnet 32 and the plate 33, and one end of the damper 4 is connected to a side portion of the yoke 31.

Further, a plate-like member 5 is attached to the frame 2 on the opposite side (the upper side in FIG. 2) of the damper 4, and a voice coil bobbin 6 is attached to the plate-like member 5. The voice coil bobbin 6 has a cylindrical shape with the Z direction as an axial direction, and extends into a gap between the inner surface of the yoke 31 and the outer surfaces of the disk-shaped magnet 32 and the plate 33. By supplying current to the voice coil bobbin 6, as shown in FIG. 3, the magnetic circuit 3 vibrates along the Z direction (axial direction of the voice coil). In the figure, reference numeral C <b> 1 is a central axis of each member constituting the voice coil bobbin 6 and the magnetic circuit 3. The plate-like member 5 may be integrated with the frame 2 or may be separate.

FIG. 4 shows a plan view of the exciter 1.
As shown in FIG. 4, the dampers 4 of this configuration are not provided at equiangular intervals with respect to the magnetic circuit 3, and a plurality of dampers 4 (this configuration) are provided on both sides of the magnetic circuit 3 along the X direction. In this case, two dampers 4 are provided at intervals in the Y direction.
By adopting such a damper arrangement, the long side portions 2L facing each other in the frame 2 (the portions facing each other in the Y direction, hereinafter referred to as the frame long side portion 2L) are brought close to the magnetic circuit 3. be able to. Thereby, the separation distance of the frame long side portion 2L can be made equal to the outer diameter of the magnetic circuit 3, and the length LY in the short direction Y of the frame 2 can be shortened.

In addition, a relatively wide gap between the magnetic circuit 3 and the short side portions 2S facing each other in the frame 2 (the portions facing the X direction, hereinafter referred to as the frame short side portion 2S). S can be secured. Due to this gap S, a sufficient space for the damper 4 can be secured. Further, since a large space (corresponding to the gap S) is also provided between the short side 2S of the frame and the magnetic circuit 3 on the back side of the damper 4, a fixing part such as a screw for attaching the exciter 1 to another member. It is possible to easily provide a fixed portion (indicated by reference numeral 8 in FIG. 4) for fixing the.

The fixed portion 8 may be provided on the plate-like member 5 or may be provided separately on the inner peripheral surface of the frame 2. 4 illustrates the case where the fixed portions 8 are provided at locations corresponding to the four corners of the frame 2, the position and number of the fixed portions 8 can be changed as appropriate.

FIG. 5 shows a conventional exciter 100. In addition, about the structure substantially the same as the exciter 1, the same code | symbol is attached | subjected and shown.
The exciter 100 includes a cylindrical frame 102 having a diameter larger than that of the magnetic circuit 3, and dampers 104 are arranged at equal angular intervals in the circumferential direction of the magnetic circuit 3. Since the dampers 104 can be arranged at equiangular intervals, the dampers 104 can be elastically held uniformly. However, since it is necessary to secure an arrangement space for each damper 104, the frame 102 cannot be reduced in diameter to the same extent as the outer diameter of the magnetic circuit 3. Therefore, when the same magnetic circuit 3 is used, the exciter 1 of the present embodiment can be arranged in a narrower space than the exciter 100.

In addition, since the empty space inside the frame 102 is narrow, the exciter 100 cannot be provided with a fixed portion such as a female screw inside the frame 102. For this reason, it is necessary to provide a pair of stays 105 extending outward in the radial direction of the frame 102, and to provide the fixed portions 108 in each stay 105. According to this configuration, even if the frame 102 has a small diameter, the exciter 100 is increased in size by the stay 105.
On the other hand, the exciter 1 of the present embodiment can secure a sufficient space (gap S) in which the fixed portion 108 can be arranged inside the frame 102 as shown in FIG. It becomes easy to suppress this.
As described above, the exciter 1 of the present embodiment can be reduced in size and easily placed in a narrow place as compared to the exciter 100 having the cylindrical frame 102.

By the way, as shown in FIG. 4, in the magnetic circuit 3 of this configuration, a pair of dampers 4 are disposed only on both sides along the X direction in a plan view. That is, the rolling phenomenon is likely to occur. The reason for this is that in the short direction Y where the width is suppressed, there is no restriction on the vibration of the damper 4 and the vibration is free. Although it is a requirement that the magnetic circuit 3 vibrate without deviating from the central axis C1 that all the dampers 4 perform the same bending, the requirement cannot be satisfied when a rolling phenomenon occurs.
In order to allow the exciter 1 to reproduce a wide range of sounds, it is ideal to keep the minimum frequency low, and therefore the damper 4 is elongated. The rolling phenomenon also easily occurs when the damper 4 is thin.

Furthermore, even if the shape of the damper 4 is the same, a rolling phenomenon occurs due to a minute processing error or a magnetic force that does not work uniformly.
Therefore, in the present embodiment, as shown in FIG. 4, a stabilizer 21 that connects a plurality of dampers 4 is provided.

The damper 4 has a curved portion 4C that curves convexly on the other side between the one end 4A connected to the magnetic circuit 3 and the other end 4B connected to the frame 2 (frame short side portion 2S). ing. Each damper 4 is formed of a plate member such as a metal plate having elasticity, and has the curved portion 4C, so that the vibration is easily transmitted to the frame 2 without reducing the vibration of the magnetic circuit 3. Yes. In addition, each damper 4 of this structure is the same shape altogether including the point which has the curved part 4C in the center part of the damper 4. FIG. However, the shape of the damper 4 may be changed as appropriate.

The stabilizer 21 is formed of the same material as the damper 4, that is, a plate material such as a metal plate having elasticity, and is formed integrally with the damper 4.
Each stabilizer 21 connects a pair of dampers 4 that are arranged at an interval in the short direction Y of the frame 2. More specifically, each stabilizer 21 is formed in a linear shape extending along the Y direction between the curved portions 4C of the pair of dampers 4, and connects the pair of dampers 4 at the shortest distance.

Each stabilizer 21 is connected to the center portion of each damper 4 (corresponding to the center position of the length along the longitudinal direction X of each damper 4), in other words, between the magnetic circuit 3 and the frame 2. Each damper 4 is connected at the position.
Since a pair of adjacent dampers 4 are connected to each other by the stabilizer 21, the dampers 4 are restricted from rotating independently, and the rolling phenomenon of the exciter 1 is suppressed. Moreover, since the curved portions 4C of each damper 4 are connected to each other, the overall length of the stabilizer 21 can be shortened, the rigidity of the stabilizer 21 can be improved, and each damper 4 is easily elastically deformed with respect to the curved portion 4C. The influence on the damper characteristics can also be suppressed.

In addition, each stabilizer 21 extends linearly in the direction in which the adjacent dampers 4 are adjacent to each other, so that the adjacent dampers 4 can be connected at the shortest distance. This also improves the rigidity of the stabilizer 21 alone.
Moreover, since each stabilizer 21 connects the center part of each damper 4, each of the damper length between the magnetic circuit 3 and the stabilizer 21 and the damper length between the stabilizer 21 and the flame | frame 2 can be ensured equally. . This further suppresses the influence of the stabilizer 21 on the damper characteristics.

In this configuration, as shown in FIG. 4, both end portions (one end portion 4A and the other end portion 4B) of a pair of dampers 4 adjacent in the Y direction are brought as close as possible to the frame long side portion 2L. As a result, the separation distance L1 between the one end portions 4A of the pair of dampers 4 and the separation distance L2 between the other end portions 4B are expanded to substantially the same length as the length LY in the short direction Y of the frame 2, thereby reducing the rolling phenomenon. It can be suppressed more.

FIG. 6 is a diagram showing a simulation result of the exciter 1.
In FIG. 6, the first embodiment is the exciter 1 shown in FIG. is there.
In the second and third embodiments, the position of the stabilizer 21 is different from that in the first embodiment. In the second embodiment, the stabilizer 21 is disposed at a position close to the frame short side portion 2S. Is arranged at a position close to the frame long side portion 2L.

Comparative Example 1 is the same as Example 1 except that the stabilizer 21 is not provided.
In Examples 2 and 3, the bending shape of the bending portion 4C is changed in accordance with the position of the stabilizer 21 so that the stabilizer 21 satisfies the condition for connecting the bending portions 4C.
For Examples 1 to 3 and Comparative Example 1 above, the presence or absence of a rolling phenomenon was confirmed, and for Example 1, the lowest reproducible frequency was confirmed.

As shown in FIG. 6, in Examples 1 to 3 having the stabilizer 21, the rolling phenomenon did not occur. On the other hand, in Comparative Example 1 that does not include the stabilizer 21, the rolling phenomenon occurred.
Further, the lowest frequency F1 of the first embodiment, the lowest frequency F2 of the second embodiment, and the lowest frequency F3 of the third embodiment have a relationship of value F1 <value F2 <value F3. Therefore, Example 1 was able to reproduce the lowest frequency and was suitable for a wide range of audio reproduction.

As described above, in this embodiment, the stabilizer 21 that connects any one of the plurality of dampers 4 that connect the magnetic circuit 3 and the frame 2 is provided, so that the dampers 4 are evenly arranged around the magnetic circuit 3. Even without this, the rolling phenomenon can be suppressed. Therefore, the degree of freedom of the shape of the frame 2 is improved, and the frame 2 can be downsized.

Also, each damper 4 has a curved portion 4C that curves toward another adjacent damper 4, and each stabilizer 21 connects the curved portions 4C to each other. Thereby, the total length of the stabilizer 21 is shortened, the rigidity of the stabilizer 21 is improved, and each damper 4 can be easily elastically deformed with reference to the curved portion 4C, thereby suppressing the influence on the damper characteristics. is there.

In addition, each stabilizer 21 extends linearly along the direction in which the dampers 4 are adjacent (corresponding to the short direction Y of the frame 2) and connects the adjacent dampers 4. This also improves the rigidity of the stabilizer 21 alone. To do.
In addition, since each stabilizer 21 connects the central portion of each damper 4, the influence of the stabilizer 21 on the damper characteristics can be efficiently suppressed, and a low frequency can be efficiently reproduced as shown in FIG.

The magnetic circuit 3 is provided with a pair of dampers 4 on both sides along a predetermined direction (corresponding to the X direction which is the longitudinal direction of the frame 2) in plan view, and each pair of dampers 4 forms a pair. Each of the curved portions 4C is connected by a stabilizer 21. Thereby, the structure which does not arrange | position the damper 4 in the direction (equivalent to Y direction which is the transversal direction of the flame | frame 2) orthogonal to a predetermined direction by planar view is attained.
As a result, as shown in FIG. 4, the frame 2 has a non-circular shape with the X direction as the longitudinal direction in plan view, and the dampers 4 are disposed on both sides of the magnetic circuit 3 perpendicular to the longitudinal direction. An impossible frame shape can be obtained, and the outer size of the frame 2 can be reduced.

The above-described embodiments are merely illustrative of one embodiment of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the pair of (two) dampers 4 are provided on both sides of the magnetic circuit 3 has been described, but the present invention is not limited to this. For example, two or more pairs of dampers 4 may be provided on both sides of the magnetic circuit 3. Also in this case, it is preferable to connect each pair of dampers 4 with the stabilizers 21, but the way of connecting the stabilizers 21 may be appropriately changed within a range in which the rolling phenomenon can be prevented.

Also, the shape of the frame 2 and the like may be changed as appropriate. Moreover, a well-known structure is widely applicable to the component of the exciter 1. FIG. Further, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2016-76763), a vibration plate may be attached to the exciter 1 and the vibration plate may be vibrated by the exciter 1 to output sound.

DESCRIPTION OF SYMBOLS 1,100 Exciter 2 Frame 2L Frame long side part 2S Frame short side part 3 Magnetic circuit 4 Damper 4A One end part 4B Other end part 4C Bending part 5 Plate-shaped member 6 Voice coil bobbin 21 Stabilizer X Longitudinal direction of the frame Y Short frame Direction Z Exciter vibration direction

Claims (6)

A magnetic circuit comprising a yoke and a magnet;
A plurality of dampers connecting the magnetic circuit and the frame;
A stabilizer for connecting any of the plurality of dampers;
An exciter characterized by comprising: Each damper has a curved portion that curves toward another adjacent damper,
The exciter according to claim 1, wherein the stabilizer connects the curved portions. The exciter according to claim 2, wherein the stabilizer extends linearly along a direction in which the dampers are adjacent to each other and connects the adjacent dampers. The exciter according to any one of claims 1 to 3, wherein the stabilizer connects a central portion of each damper. The magnetic circuit is provided with a pair of dampers on both sides along a predetermined direction in plan view,
The exciter according to any one of claims 1 to 4, wherein each of the pair of dampers has a curved portion that curves to a mating counterpart, and each curved portion is connected by the stabilizer. . The frame is a non-circular shape having the predetermined direction as a longitudinal direction in plan view,
6. The exciter according to claim 5, wherein the magnetic circuit has a frame shape in which the damper cannot be disposed on both sides orthogonal to the longitudinal direction.

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