JP2019147123A - Vibration unit - Google Patents

Abstract

To provide a vibration unit capable of restraining damage to a suspension.SOLUTION: Since a position of connection 51 between a suspension 5 and a magnetic circuit 2 passes through the center of gravity G of a magnetic circuit 2 and is shifted to one side in Z-direction with respect to an orthogonal plane S, when external force in a direction along the orthogonal plane S is applied to a vibration unit 1A as a whole, not only force in an in-plane direction but also force in an out-of-plane direction are applied to the suspension 5, causing the suspension 5 to deform in a direction capable of exhibiting spring properties. Further, since a case 4 has a stopper 43, the magnetic circuit 2 is restrained from being displaced by a certain amount or more in a direction along an X-Y plane, and the suspension 5 is prevented from being excessively deformed, thus restraining damage to suspension 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration unit.

  Conventionally, an electroacoustic transducer (vibration unit) that includes a magnetic circuit and a voice coil to generate vibration has been proposed (see, for example, Patent Document 1). In the electroacoustic transducer described in Patent Document 1, vibration is generated by a magnetic interaction between the magnetic circuit and the voice coil because the suspension supporting the magnetic circuit is fixed to the case. Yes.

JP 2000-201396 A

  In the electroacoustic transducer described in Patent Document 1, a suspension is connected in the vicinity of the center in the vibration direction of the magnetic circuit. That is, the connection position between the suspension and the magnetic circuit is close to an orthogonal plane that passes through the center of gravity of the magnetic circuit and is orthogonal to the vibration direction. However, in such a configuration, there is a possibility that the suspension may be damaged when an external force in a direction along the orthogonal plane is applied to the electroacoustic transducer (for example, during transportation). That is, even if the suspension is easily deformed by the force in the out-of-plane direction, the spring property is hardly exhibited against the force in the in-plane direction, and plastic deformation is likely to occur.

  Therefore, an object of the present invention is to provide a vibration unit that can suppress damage to the suspension as an example.

  In order to solve the above-described problems and achieve the object, the vibration unit according to the first aspect of the present invention includes a magnetic circuit, a case that houses the magnetic circuit, and a suspension that supports the magnetic circuit on the case. The suspension is connected to the magnetic circuit at a position that is shifted to one side of the vibration direction with respect to an orthogonal plane that passes through the center of gravity of the magnetic circuit and is orthogonal to the vibration direction. The magnetic circuit has a stopper for restricting relative movement of the magnetic circuit in the direction along the orthogonal plane with respect to the case.

It is sectional drawing which shows the vibration unit which concerns on the Example of this invention. It is sectional drawing which shows the principal part of the said vibration unit. It is sectional drawing which shows a mode when a case and a magnetic circuit are going to rotate relatively in the said vibration unit. It is sectional drawing which shows the vibration unit which concerns on the modification of this invention.

  Embodiments of the present invention will be described below. A vibration unit according to an embodiment of the present invention includes a magnetic circuit, a case that houses the magnetic circuit, and a suspension that supports the magnetic circuit on the case. The suspension is connected to the magnetic circuit at a position shifted to one side of the vibration direction with respect to an orthogonal plane passing through the center of gravity of the magnetic circuit and orthogonal to the vibration direction. The case has a stopper that restricts the magnetic circuit from moving relative to the case in a direction along an orthogonal plane.

  The connection position between the suspension and the magnetic circuit is shifted to one side of the vibration direction with respect to the orthogonal plane passing through the center of gravity of the magnetic circuit and orthogonal to the vibration direction, so that the external force in the direction along the orthogonal plane is reduced. When applied to the entire vibration unit, not only in-plane force but also out-of-plane force is applied to the suspension. Therefore, the suspension is deformed in the direction in which the spring property can be exhibited. Furthermore, since the case has a stopper, the magnetic circuit can be prevented from being displaced by a certain amount or more in the direction along the orthogonal plane, the suspension can be prevented from being excessively deformed, and damage to the suspension can be suppressed.

  On the other hand, in the configuration in which the connection position between the suspension and the magnetic circuit is arranged on an orthogonal plane, when a stopper is provided on the case to suppress the plastic deformation of the suspension, the magnetic circuit and the stopper are positioned relatively close to each other. Need to be placed. Therefore, it is difficult to suppress the plastic deformation of the suspension, and the original vibration along the vibration direction may be hindered.

  Note that the magnetic circuit in the present embodiment refers to an assembly of components that are supported by a suspension and vibrate. That is, when the suspension supports not only the magnet but also the weight, this weight is also included in the magnetic circuit, and the center of gravity of the magnetic circuit means the center of gravity of the entire magnetic circuit including the weight. The “direction along the orthogonal plane” includes not only the in-plane direction of the orthogonal plane but also a direction having a slight inclination with respect to the orthogonal plane.

  The stopper is preferably located in the vicinity of the outer peripheral surface of the magnetic circuit. That is, it is preferable that the stopper can contact the outer peripheral surface of the magnetic circuit when the magnetic circuit moves relative to the case in the direction along the orthogonal plane. Accordingly, the stopper can be easily brought into contact with the magnetic circuit, and the magnetic circuit can be easily prevented from being displaced by a certain amount or more in the direction along the orthogonal plane.

  It is preferable that the stopper has a wall portion erected from a lid portion facing the magnetic circuit in the vibration direction in the case. Thereby, it is easy to secure the contact area between the stopper and the magnetic circuit, and it is possible to easily suppress the magnetic circuit from being displaced by a certain amount or more in the direction along the orthogonal plane.

  The magnetic circuit may have a recess or a through hole in a portion facing the case in the vibration direction, and the stopper may be disposed inside the recess or the through hole while extending along the vibration direction. Thereby, the space | interval of the outer peripheral surface of a magnetic circuit and the inner peripheral surface of a case is narrowed, and it is easy to reduce a case.

  The connection position between the suspension and the magnetic circuit is preferably shifted to the voice coil side in the vibration direction with respect to the orthogonal plane. The stopper is preferably arranged on the opposite side of the suspension with the orthogonal plane interposed therebetween.

  The case preferably has a stopper and a case body integrally. Thereby, the increase in the number of parts by providing a stopper can be suppressed.

  The seat according to the embodiment of the present invention incorporates the vibration unit described above. In the vibration unit built in such a seat, as described above, the magnetic circuit can be prevented from being displaced by a certain amount or more in the direction along the orthogonal plane, and the suspension can be prevented from being damaged.

  Examples of the present invention will be specifically described below. As shown in FIGS. 1 and 2, the vibration unit 1 </ b> A of this embodiment includes a magnetic circuit 2, a voice coil 3, a case 4, and a suspension 5. The vibration unit 1A is built in, for example, a vehicle seat as a moving body (embedded in urethane foam) and used to transmit vibration to a seated person. In this embodiment, the vibration generation direction (vibration direction) in the vibration unit 1 </ b> A is the Z direction, and two directions in a plane orthogonal to the Z direction are the X direction and the Y direction.

  The magnetic circuit 2 includes a magnet 21, a yoke 22, and a plate 23. The yoke 22 has a bottom plate portion 221 and a cylindrical portion 222, and is formed in a bottomed cylindrical shape that is open on one side in the Z direction (upper side in FIG. 2). On the bottom plate part 221, a magnet 21 and a plate 23 are laminated in this order on one side in the Z direction. The plate 23 and the cylindrical portion 222 face each other with an interval in each direction in the XY plane, and an air gap is formed.

  The voice coil 3 is supported by the upper lid 42 of the case 4 as will be described later, and is disposed in the air gap of the magnetic circuit 2.

  The case 4 includes a bottomed cylindrical box portion 41 opened on one side in the Z direction (upper side in FIG. 2) and an upper lid (lid portion) 42 that closes the opening of the box portion 41. The box part 41 and the upper lid 42 are made of resin and constitute a case main body.

  The box portion 41 includes a bottom plate portion (lid portion) 411 facing the magnetic circuit in the Z direction and a cylindrical portion 412 having the Z direction as an axial direction, and a plurality of stoppers 43 are integrally formed. ing. The bottom plate portion 411 and the cylindrical portion 412 are smoothly connected by a curved surface. The stopper 43 has a wall portion 431 erected from the bottom plate portion 411 and a radial portion 432 extending radially inward from the inner peripheral surface of the tubular portion 412 and is T-shaped when viewed from the Z direction. Is formed. The wall portion 431 of the stopper 43 is disposed so as to face the outer circumferential surface of the yoke 22 in the radially outer side. The radial part 432 is formed integrally with the bottom plate part 411.

  The upper lid 42 has a cylindrical coil support portion 421 that protrudes toward the inside of the case 4. The coil support portion 421 is a portion that becomes the core of the voice coil 3.

  The suspension 5 is formed in an annular plate shape extending along the XY plane, and is connected to the upper end portion of the yoke 22 to support the magnetic circuit 2 on the box portion 41. The suspension 5 is formed with a through hole penetrating in the Z direction.

  In the present embodiment, the center of gravity G of the magnetic circuit 2 is located in the magnet 21. Therefore, the suspension 5 is connected to the magnetic circuit 2 at a position shifted to one side (upper side in FIG. 1) in the Z direction with respect to the orthogonal plane S passing through the center of gravity G and orthogonal to the vibration direction (Z direction). . The voice coil 3 is disposed on one side in the Z direction with respect to the orthogonal plane S, and the stopper 4 is disposed on the other side in the Z direction with respect to the orthogonal plane S. That is, the connection position 51 between the suspension 5 and the magnetic circuit 2 is shifted to the voice coil 3 side in the Z direction with respect to the orthogonal plane S, and the stopper 4 is disposed on the opposite side of the suspension 5 across the orthogonal plane S. Has been.

  When the vibration in the Z direction is generated by the magnetic interaction between the magnetic circuit 2 and the voice coil 3 in the vibration unit 1A as described above, the magnetic circuit 2 has the case 4 around the rotation axis along the XY plane. (See FIG. 3, in the example shown, the rotation about the rotation axis along the Y direction). At this time, the stopper 43 is provided so as to restrict the relative movement of the magnetic circuit 2 with respect to the case 4 in the direction along the XY plane by contacting the outer peripheral surface of the yoke 22 in the magnetic circuit 2. Yes. Thereby, the displacement amount in the direction along the orthogonal plane (XY plane) in the case 4 of the magnetic circuit 2 is regulated.

  Further, a large external force in a direction along the orthogonal plane S may be applied to the entire vibration unit 1A during transportation or the like. At this time, since the connection position 51 between the suspension 5 and the magnetic circuit 2 is shifted to one side in the Z direction with respect to the orthogonal plane S, the suspension 5 has a force (surface) in the direction along the orthogonal plane S. In addition to the inward force, a force along the Z direction (out-of-plane force) is also applied. Therefore, the suspension 5 can be bent and deformed so as to protrude toward one side or the other side in the Z direction.

  Here, the connection unit 51 arranged on the orthogonal plane S is a vibration unit of a comparative example. In the vibration unit of the comparative example, when the case 4 is provided with a stopper to suppress plastic deformation of the suspension 5, it is necessary to arrange the magnetic circuit 2 and the stopper at a relatively close position. Therefore, it is difficult to suppress the plastic deformation of the suspension 5, and the original vibration along the Z direction may be hindered.

  With the above configuration, the connection position 51 between the suspension 5 and the magnetic circuit 2 passes through the center of gravity G of the magnetic circuit 2 and is shifted to one side in the Z direction with respect to the orthogonal plane S. On the other hand, when an external force in a direction along the orthogonal plane S is applied, not only an in-plane direction force but also an out-of-plane direction force is applied to the suspension 5, and the suspension 5 can exhibit a spring property. Cause deformation. Furthermore, since the case 4 has the stopper 43, the magnetic circuit 2 is prevented from being displaced by a certain amount in the direction along the XY plane, the suspension 5 is prevented from being excessively deformed, and the suspension 5 is prevented from being damaged. can do.

  Further, since the stopper 43 is positioned in the vicinity of the magnetic circuit 2, the stopper 43 can be easily brought into contact with the magnetic circuit 2, and the magnetic circuit 2 can be easily prevented from being displaced by a certain amount in the direction along the XY plane. be able to.

  Moreover, since the stopper 43 has the wall part 431, it is easy to ensure the contact area of the stopper 43 and the magnetic circuit 2, and it is easy to suppress that the magnetic circuit 2 displaces more than a fixed amount in the direction along the XY plane. can do.

  Further, since the stopper 43 is formed integrally with the box portion 41, an increase in the number of parts due to the provision of the stopper 43 can be suppressed.

  In addition, this invention is not limited to the said Example, The other deformation | transformation etc. which can achieve the objective of this invention are included in this invention.

  For example, in the above-described embodiment, the stopper 43 is located in the vicinity of the outer peripheral surface of the magnetic circuit 2 and contacts the outer peripheral surface of the magnetic circuit 2 when the magnetic circuit 2 is displaced by a certain amount in the direction along the XY plane. However, the stopper is not limited as long as it restricts relative movement of the magnetic circuit 2 in the direction along the orthogonal plane S with respect to the case 4, and is in contact with other parts of the magnetic circuit 2. Also good.

  In the vibration unit 1B of the modification shown in FIG. 4, the magnetic circuit 2 is formed with a through hole 20 that passes through the central portion in the XY plane and extends along the Z direction. That is, the through hole 20 is formed in a portion of the magnetic circuit 2 that faces the case 4 in the Z direction. The case 4 is formed with a columnar stopper 44 extending along the Z direction from the bottom plate portion 411 toward the inside of the case 4. The stopper 44 is disposed inside the through hole 20, and the tip of the stopper 44 projects to one side in the Z direction from the upper surface of the plate 23.

  In the vibration unit 1B of such a modification, similarly to the vibration unit 1A of the above embodiment, the magnetic circuit 2 can be prevented from being displaced by a certain amount or more in the direction along the XY plane by the stopper 44. According to such a vibration unit 1B, it is easy to reduce the size of the case 4 by narrowing the distance between the outer peripheral surface of the magnetic circuit 2 and the inner peripheral surface of the case 4.

  Further, in the vibration unit 1B of the modified example, the through hole 20 is formed in the magnetic circuit 2, but a non-penetrating recess is formed in the magnetic circuit 2 and a stopper is disposed inside the recess. Good.

  Moreover, in the said Example, although the stopper 43 shall have the wall part 431 and the radial part 432, the stopper may have only any one of a wall part and a radial part. The stopper may be formed in a bar shape or a column shape extending from the upper surface of the bottom plate portion 411 or the inner peripheral surface of the cylindrical portion 412 toward the inside of the case 4.

  In the above embodiment, the connection position 51 between the suspension 5 and the magnetic circuit 2 is shifted to the voice coil 3 side in the Z direction with respect to the orthogonal plane S. It may be.

  Moreover, in the said Example, although the stopper 43 shall be arrange | positioned on the opposite side of the suspension 5 across the orthogonal plane S, you may arrange | position at the suspension 5 side.

  Moreover, in the said Example, although the stopper 43 shall be formed integrally with the box part 41, the stopper may be formed separately with both the box part and the upper cover. If the stopper is separated from the box portion and the upper lid, the stopper can be added using the conventional box portion and upper lid.

  In the first embodiment, the vibration unit 1A is built in the seat of the moving body. However, the vibration unit may be installed on an object that can transmit vibration to the user. For example, when it is provided in a moving body, it may be incorporated in a steering wheel, a shift lever, a door opening / closing operation unit, or the like.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, although the present invention has been particularly illustrated and described with respect to particular embodiments, it will be understood that the present invention is not limited in shape to the embodiments described above without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

1A Vibration unit 2 Magnetic circuit 20 Through hole 3 Voice coil 4 Case 411 Bottom plate (lid)
43 Stopper 431 Wall 5 Suspension G Center of gravity S Orthogonal plane

Claims (8)

A magnetic circuit;
A case for accommodating the magnetic circuit;
A suspension for supporting the magnetic circuit on the case,
The suspension is connected to the magnetic circuit at a position shifted to one side of the vibration direction with respect to an orthogonal plane that passes through the center of gravity of the magnetic circuit and is orthogonal to the vibration direction.
The vibration unit according to claim 1, wherein the case includes a stopper that restricts the magnetic circuit from moving relative to the case in a direction along the orthogonal plane.   The vibration unit according to claim 1, wherein the stopper is located in the vicinity of an outer peripheral surface of the magnetic circuit.   3. The vibration unit according to claim 2, wherein the stopper includes a wall portion erected from a lid portion facing the magnetic circuit in the vibration direction in the case. The magnetic circuit has a recess or a through hole in a portion facing the case in the vibration direction,
The vibration unit according to claim 1, wherein the stopper extends along the vibration direction and is disposed inside the recess or the through hole.   5. The vibration unit according to claim 1, wherein a connection position between the suspension and the magnetic circuit is deviated toward the voice coil in the vibration direction with respect to the orthogonal plane.   The vibration unit according to claim 1, wherein the stopper is disposed on the opposite side of the suspension across the orthogonal plane.   The vibration unit according to claim 1, wherein the case integrally includes the stopper and a case main body.   A seat including the vibration unit according to any one of claims 1 to 7.

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