JP2021035007A - Actuator and panel speaker - Google Patents

Abstract

To provide an actuator in which a coil can efficiently be mounted in a support, and to provide a panel speaker.SOLUTION: In an actuator, a coil is held by a cylindrical part 611 of a coil holder 61, and the coil holder 61 is held by an end plate part 31 of a first support member 3. The end plate part 31 is provided with: a first opening 324 that is open toward the other side L2 in an axial direction L; and a first engagement part 326 directed toward one side L1 in the axial direction L in a position adjacent to the first opening 324 on one side CW in a circumferential direction. Therefore, the claw part 615 engages with the first engagement part 326 from the one side L1 in the axial direction L1 by rotating the coil holder 61 toward the one side CW in the circumferential direction after the claw part 615 is radially bent in the coil holder 61 in advance and the claw part 615 is inserted into the first opening 324.SELECTED DRAWING: Figure 9

Description

The present invention relates to an actuator that generates various vibrations and a panel speaker.

As a device that generates vibration by a magnetic drive mechanism, an actuator having a support that holds a tubular coil and a movable body that is supported by a gel-like damper member with respect to the support has been proposed (patented). Reference 1). In such an actuator, the movable body includes a permanent magnet located inside the radial direction of the coil, a first yoke fixed to the permanent magnet on one side in the axial direction inside the radial direction of the coil, and an axis line with respect to the permanent magnet. A second yoke fixed on the other side of the direction is provided. The second yoke includes a side plate portion extending to a position facing the first yoke in a direction intersecting the axial direction via a coil, and supports the second yoke facing the first yoke in a direction intersecting the axial direction. A gel-like damper member is arranged between the body and the body. The support has a holder that overlaps the movable body from one side in the axial direction, and the coil is directly held by a cylindrical portion that protrudes from the holder to the other side in the axial direction.

JP-A-2017-60207

In a configuration in which the coil is directly held in the cylindrical portion of the holder in which the movable body is overlapped from one side in the axial direction as in the actuator described in Patent Document 1, the coil is adhered to the cylindrical portion of the holder in the actuator assembly process. Since it is necessary to fix it with an agent, there is a problem that the production efficiency is low.

In view of the above problems, an object of the present invention is to provide an actuator and a panel speaker capable of efficiently mounting a coil on a support.

In order to solve the above problems, the actuator according to the present invention has a coil holder that holds a tubular coil wound around an axis, a support that holds the coil holder, and elasticity with respect to the support. It has a movable body supported via a member, and a magnetic drive mechanism provided with a magnet held by the movable body and moving the movable body in the axial direction in which the axis extends with respect to the support. The coil holder is bent in a radial direction centered on the axis on one side of the tubular portion in the axial direction and a tubular portion extending around the axis to hold the coil. The support includes an engaging plate portion having a claw portion, and the support has an end plate portion that overlaps the coil holder on one side in the axial direction, and the end plate portion is on the other side in the axial direction. A first opening having a larger width in the circumferential direction around the axis than the claw, and one in the axial direction at a position adjacent to the first opening on one side in the circumferential direction. It is characterized in that it is formed so as to face the side and includes a first engaging portion in which the claw portion engages from one side in the axial direction.

In the present invention, the coil is held by the tubular portion of the coil holder, and the coil holder is held by the support. Further, the coil holder has an engaging plate portion having a claw portion bent on one side in the radial direction on one side in the axial direction of the tubular portion, while the coil holder overlaps the coil holder on one side in the axial direction in the support. The end plate portion has a first opening that opens toward the other side in the axial direction and a first engagement that faces one side in the axial direction at a position adjacent to the first opening on one side in the circumferential direction. A part is provided. Therefore, in the coil holder that holds the coil, the claw portion is bent in the radial direction in advance, the claw portion is inserted into the first opening, and then the coil holder is rotated to one side in the circumferential direction. The claw portion engages with the first engaging portion from one side in the axial direction. Therefore, since it is not necessary to bond the coil to the support, the coil can be efficiently mounted on the support. Further, since the claw portion of the coil holder is bent in the radial direction in advance, for example, unlike the case where the claw portion is inserted into the slit and then bent, the claw portion can be bent deeply, and the claw portion is the original. Springback that tries to return to the shape is unlikely to occur. Therefore, even if the claw portion is not adhered to the support, the engagement of the claw portion is difficult to loosen when the movable body is vibrated, so that the generation of abnormal noise due to the vibration of the coil holder can be suppressed. Can be done.

In the present invention, the engaging plate portion includes a protruding portion protruding from the tubular portion on one side in the axial direction, and the claw portion is the diameter of the protruding portion on one side in the axial direction. A mode that is bent to one side in the direction can be adopted.

In the present invention, the end plate portion projects from one end of the first engaging portion in the circumferential direction to one side in the axial direction, and the claw portion abuts from one side in the circumferential direction. A mode having a second engaging portion can be adopted. According to such an embodiment, after inserting the claw portion into the inside of the first opening portion, if the coil holder is rotated to one side in the circumferential direction until the claw portion abuts on the second engaging portion, the claw portion is first. 1 It can be securely engaged with the engaging portion.

In the present invention, the end plate portion has the first engaging portion at the bottom of the end surface on one side of the end plate portion in the axial direction so as to overlap the first engaging portion when viewed from the axial direction. It is possible to adopt a mode in which the second opening is provided, and the second opening communicates with the first opening in the circumferential direction. According to this aspect, when the end plate portion of the support is resin-molded, the first engaging portion can be formed without using a complicated and expensive mold. Further, since the bottom portion of the second opening portion is the first engaging portion, the claw portion and the first engaging portion can be engaged with each other at a position retracted from the end plate portion to the other side in the axial direction. Therefore, it is possible to prevent the claw portion from protruding from the end plate portion to one side in the axial direction.

In the present invention, the first opening includes a bottom wall, and the claw portion has a first portion located on one side in the circumferential direction engaged with the first engaging portion from one side in the axial direction. A mode in which a second portion of the claw portion located on the other side in the circumferential direction from the first portion overlaps the bottom wall from the other side in the axial direction can be adopted. According to this aspect, when the claw portion is inserted into the inside of the first opening, the claw portion is inserted into the inside of the first opening until the claw portion abuts on the bottom wall, and then the coil holder is inserted in the circumferential direction. When rotated to one side, the claw portion engages with the first engaging portion from one side in the axial direction. Therefore, the coil can be efficiently mounted on the support via the coil holder.

In the present invention, it is possible to adopt an embodiment in which the claw portion protrudes to one side in the axial direction and has a misalignment prevention portion capable of contacting the bottom wall from one side in the circumferential direction. According to such an aspect, it is possible to prevent the coil holder from rotating to the other side in the circumferential direction to disengage the claw portion from the first engaging portion.

In the present invention, it is possible to adopt an embodiment in which the bottom wall has a misalignment prevention portion that projects to the other side in the axial direction and allows the claw portion to come into contact with one side in the circumferential direction. According to such an aspect, it is possible to prevent the coil holder from rotating to the other side in the circumferential direction to disengage the claw portion from the first engaging portion.

In the present invention, the support may adopt an aspect in which the end plate portion is made of a resin material. According to such an aspect, when the end plate portion is resin-molded, the first opening portion, the second engaging portion and the like can be formed.

The actuator according to the present invention can be used for a panel speaker, in which case the support is fixed to the diaphragm. In the present invention, the diaphragm can adopt an aspect of being a display panel.

In the present invention, the coil is held by the tubular portion of the coil holder, and the coil holder is held by the support. Further, the coil holder has an engaging portion having a claw portion bent on one side in the radial direction on one side in the axial direction of the tubular portion, while the end of the support overlaps the coil holder on one side in the axial direction. The plate portion has a first opening that opens toward the other side in the axial direction and a first engaging portion that faces the other side in the axial direction at a position adjacent to the first opening on one side in the circumferential direction. And are provided. Therefore, in the coil holder that holds the coil, the claw portion is bent in the radial direction in advance, the claw portion is inserted into the first opening, and then the coil holder is rotated to one side in the circumferential direction. The claw portion engages with the first engaging portion from one side in the axial direction. Therefore, since it is not necessary to bond the coil to the support, the coil can be efficiently mounted on the support. Further, since the claw portion of the coil holder is bent in the radial direction in advance, for example, unlike the case where the claw portion is inserted into the slit and then bent, the claw portion can be bent deeply, and the claw portion is the original. Springback that tries to return to the shape is unlikely to occur. Therefore, even if the claw portion is not adhered to the support, the engagement of the claw portion is difficult to loosen when the movable body is vibrated, so that the generation of abnormal noise due to the vibration of the coil holder can be suppressed. Can be done.

The perspective view of the actuator which concerns on Embodiment 1 of this invention. The exploded perspective view which separated the support and the movable body from the state shown in FIG. A perspective view of the actuator shown in FIG. 1 when viewed from different directions. FIG. 5 is a YZ cross-sectional view of the actuator shown in FIG. An exploded perspective view of a state in which a viscoelastic member or the like is removed from the actuator shown in FIG. FIG. 5 is an enlarged perspective view showing a fixed structure of the coil holder with respect to the first support member shown in FIG. FIG. 5 is an enlarged plan view showing a fixed structure of the coil holder with respect to the first support member shown in FIG. An exploded perspective view showing an enlarged fixed structure of the coil holder with respect to the first support member shown in FIG. FIG. 6 is a cross-sectional view schematically showing how the claw portion shown in FIG. 6 is engaged with the first engaging portion. Explanatory drawing of the panel speaker provided with the actuator shown in FIG. An explanatory view showing an enlarged portion of a fixed portion between the actuator and the diaphragm shown in FIG. Explanatory drawing of the actuator which concerns on Embodiment 2 of this invention. Explanatory drawing of the actuator which concerns on Embodiment 3 of this invention. The explanatory view of the actuator which concerns on Embodiment 4 of this invention. The explanatory view of the actuator which concerns on Embodiment 5 of this invention.

Embodiments of the present invention will be described with reference to the drawings. In the following description, the three directions intersecting each other will be described as the Z-axis direction (first direction), the X-axis direction (second direction), and the Y-axis direction (third direction), respectively. The Z-axis direction (first direction), the X-axis direction (second direction), and the Y-axis direction (third direction) are orthogonal to each other. Further, Z1 is attached to one side in the Z-axis direction, Z2 is attached to the other side in the Z-axis direction, X1 is attached to one side in the X-axis direction, and X2 is attached to the other side in the X-axis direction. Y1 will be attached to one side in the Y-axis direction, and Y2 will be attached to the other side in the Y-axis direction. The central axis of the movable body 5 is simply referred to as the axis L, L1 is attached to one side in the axis L direction in which the axis L extends, and L2 is attached to the other side in the axis L direction. Further, in the following description, the circumferential direction and the radial direction are the circumferential direction and the radial direction centered on the axis L.

[Embodiment 1]
(overall structure)
FIG. 1 is a perspective view of the actuator 1 according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view in which the support 2 and the movable body 5 are separated from the state shown in FIG. FIG. 3 is a perspective view of the actuator 1 shown in FIG. 1 when viewed from different directions. FIG. 4 is a YZ cross-sectional view of the actuator 1 shown in FIG.

As shown in FIGS. 1, 2, 3, and 4, the actuator 1 of the present embodiment has a flat rectangular parallelepiped shape in which the dimensions in the Z-axis direction are smaller than the dimensions in the X-axis direction and the dimensions in the Y-axis direction. Have. The actuator 1 is a support 2 that holds a tubular coil 60 wound around an axis L extending in the Z-axis direction, and a movable body that is supported by the support 2 via a viscoelastic member 80. The movable body 5 holds a coil 60, a magnet 50 and the like constituting the magnetic drive mechanism 6. Therefore, the movable body 5 can be vibrated in the Z-axis direction by the drive current supplied from the outside to the coil 60 via the terminal 28.

(Structure of support 2)
FIG. 5 is an exploded perspective view of the actuator 1 shown in FIG. 1 with the viscoelastic member 80 and the like removed. In FIGS. 1 to 5, the support 2 has a first support member 3 that overlaps the movable body 5 from one side L1 in the axis L direction, and a second support that overlaps the first support member 3 from the other side L2 in the axis L direction. It has a member 4. The first support member 3 and the second support member 4 are made of, for example, a resin material.

The first support member 3 has a substantially quadrangular end plate portion 31 at the end portion of one side L1 in the axis L direction. A circular recess 32 is formed on the surface of the end plate portion 31 on the other side L2 in the axis L direction, and the periphery of the recess 32 is surrounded by a first wall portion 33 formed of a circumferential surface. Here, on the inner peripheral surface of the first wall portion 33, the convex portions 331 for positioning protruding inward in the radial direction extend in the axis L direction at three locations at equal angular intervals.

In the first support member 3, a first outer edge portion 34 extending along the outer edge of the first support member 3 is provided on the radial outer side of the first wall portion 33, and the first outer edge portion 34 is provided with the first outer edge portion 34. It has four corners 35 protruding outward from the first wall 33. In each of the four corners 35, a hole 351 for fixing the bolt 29 is opened toward the other side L2 in the axis L direction, and the hole 351 penetrates the corner 35 to one side L1 in the axis L direction. ing. Around the hole 351 is a cylindrical portion 352, and around the cylindrical portion 352, a recess 353 is opened toward the other side L2 in the axis L direction. The recess 353 is a bottomed recess having a bottom on one side L1 in the axis L direction, and is a meat stealing portion for improving molding accuracy when the first support member 3 is resin-molded.

The center of the bottom portion 320 of the recess 32 is a circular thick portion 323 protruding from the annular outer peripheral portion 322 to the other side L2 in the axis L direction, and the center of the thick portion 323 is from a circular through hole. An opening 325 is formed.

As shown in FIG. 3, the end surface 310 located on one side L1 in the axis L direction of the end plate portion 31 has a flat surface portion 315 orthogonal to the axis L and a flat surface portion 315 protruding from the flat surface portion 315 to one side L1 in the axis L direction. A protruding portion 316 is formed. In this embodiment, the protrusion 316 is arranged so as to surround the axis L. For example, a plurality of projecting portions 316 may be arranged so as to surround the axis L, or may extend so as to surround the axis L. In this embodiment, the protrusion 316 extends along the edge of the opening 325. Therefore. The protruding portion 316 is formed in a rib shape extending in an annular shape so as to surround the axis L, and a flat surface portion 315 is provided on the radial outer side of the protruding portion 316.

The first support member 3 is provided with plate-shaped convex portions 38 on both sides in the X-axis direction, which can be used for positioning when assembling the actuator 1 and as a connecting portion when mounting the actuator 1 on various devices. ing.

Again, in FIGS. 1 to 5, the second support member 4 has a substantially quadrangular planar shape. A window 41 formed of a circular through hole is formed in the center of the second support member 4, and the second support member 4 has a frame shape. Therefore, of the movable body 5, the flat plate portion 521 of the second yoke 52, which will be described later, is in an open state toward the other side L2 in the axis L direction by the window 41.

The second support member 4 is formed with a cylindrical portion 42 extending along the edge of the window 41, and the inner peripheral surface of the cylindrical portion 42 constitutes the second wall portion 43. The cylindrical portion 42 projects from the edge of the window 41 to both one side L1 and the other side L2 in the Z-axis direction.

In the second support member 4, a plate-shaped second outer edge portion 44 extending along the outer edge of the second support member 4 is provided on the radial outer side of the second wall portion 43, and the second outer edge portion 44 has four flange-shaped corners 45 that project outward in the radial direction. In the present embodiment, each of the four corner portions 45 is formed with a hole 451 through which the bolt 29 is passed, and the hole 451 penetrates the corner portion 45 up to one side L1 in the axis L direction.

Here, of the outer peripheral surface of the cylindrical portion 42, the portion located on one side L1 in the axis L direction from the second outer edge portion 44 is a positioning recess 421 recessed inward in the radial direction at three equiangular intervals. Extends in the L direction of the axis.

(Combined structure of the first support member 3 and the second support member 4)
The height of the end portion 340 of the other side L2 of the first outer edge portion 34 of the first support member 3 in the axial direction L direction is constant including the corner portion 35 and the side portion 36, and the end portion of the first outer edge portion 34. 340 is located in a virtual plane orthogonal to the axis L. On the other hand, in the second outer edge portion 44 of the second support member 4, the portion corresponding to the corner portion 45 is a protrusion protruding from the side portion 46 located between the corner portions 45 toward one side L1 in the axis L direction. It is a department. Therefore, the side portion 46 is recessed from the corner portion 45 on the other side L2 in the axis L direction.

In this embodiment, when the support 2 is constructed, the second support member 4 is overlapped with the first support member 3, and the cylindrical portion of the second support member 4 is inside the first wall portion 33 of the first support member 3. Fit 42. At that time, with respect to the concave portion 421 formed on the outer peripheral surface of the cylindrical portion 42 of the second support member 4, the convex portion 331 formed on the inner peripheral surface of the first wall portion 33 of the first support member 3 is aligned with the axis L. The first support member 3 and the second support member 4 are aligned in the circumferential direction by fitting from one side L1 in the direction. As a result, the hole 351 formed in the corner portion 35 of the first support member 3 and the hole 451 formed in the corner portion 45 of the second support member 4 overlap in the axis L direction. Therefore, when the bolt 29 made of the tapping screw is fixed to the holes 351 and 451 from the other side L2 in the axis L direction, the first support member 3 and the second support member 4 are connected.

In this state, as shown in FIGS. 1, 3, and 4, a plurality of first outer edge portions 34 and second outer edge portions 44 are coupled to each other in a state of surface contact with each other in the axis L direction. A first boundary portion 21 and a second boundary portion 22 that are separated from each other in the axis L direction are provided between the plurality of first boundary portions 21. More specifically, the four corners 35 of the first support member 3 and the four corners 45 of the second support member 4 are joined by bolts 29 in a state of surface contact in the L direction of the axis to form the first boundary. It constitutes a part 21. On the other hand, since the side portion 46 extending between the four corner portions 45 is a recess, between the side portion 36 extending between the four corner portions 35 and the four corner portions 45. The extending side portion 46 constitutes a second boundary portion 22 that is separated in the axis L direction, and the second boundary portion 22 forms a gap 220 that opens toward both sides in the direction orthogonal to the axis L. ..

As described above, in the present embodiment, between the first outer edge portion 34 of the first support member 3 and the second outer edge portion 44 that overlaps the first outer edge portion 34 in the second support member 4 in the axis L direction, the axis L direction Since a plurality of first boundary portions 21 that are bonded to each other in surface contact with each other are provided, the first outer edge portion 34 and the second outer edge portion 34 and the second outer edge portion can be efficiently and easily used regardless of whether a bolt 29 or an adhesive is used. It can be combined with 44.

Further, between the first outer edge portion 34 and the second outer edge portion 44, a second boundary portion 22 is provided which is separated in the axis L direction between the plurality of first boundary portions 21. Therefore, even if the first support member 3 and the second support member 4 vibrate when the movable body 5 is vibrated in the Z-axis direction, the first boundary portion 21 firmly fixed by the bolt 29 is the first. At the two boundary portions 22, the state in which the first outer edge portion 34 and the second outer edge portion 44 are separated from each other is maintained, so that the generation of abnormal noise can be suppressed.

(Composition of coil 60, etc.)
The coil 60 has a cylindrical shape wound around the axis L. In providing the coil 60 on the support 2, in the present embodiment, the coil holder 61 having the tubular portion 611 extending around the axis L is fixed to the first support member 3. The coil holder 61 is made by processing a non-magnetic metal plate, and a tubular portion 611 is formed by bending a strip-shaped extending portion into an arc shape, and a cylindrical portion 611 is formed on the outer peripheral surface of the tubular portion 611. Coil 60 is held. The coil holder 61 includes six claw-shaped engaging plate portions 613 protruding from the tubular portion 611 on one side Z1 in the Z-axis direction. The structure for fixing the coil holder 61 to the first support member 3 will be described later with reference to FIG. 6 and the like.

One of the four corners 35 of the first support member 3 is a terminal block 37 protruding outward in the radial direction, and the terminal block 37 holds the terminal 28. The terminal block 37 is provided with two round bar-shaped protrusions 371 that protrude toward the other side L2 in the axis L direction. The terminal block 37 is surrounded by a side wall 372. A slit 373 is formed in a portion of the side wall 372 located between the side wall 372 and the recess 32. Therefore, the end portion (not shown) of the coil 60 can be routed to the protrusion 371 through the slit 373. Further, if the end portion of the coil 60 is entwined with the root of the protrusion 371 and soldered in this state, the terminal 28 and the end portion of the coil 60 can be electrically connected. Therefore, if a wiring member such as a flexible wiring board or a lead wire is electrically connected to the terminal 28, power can be supplied to the coil 60 via the terminal 28. In the second support member 4, one of the four corner portions 45 is a lid portion 47 that projects outward in the radial direction and covers the terminal block 37.

(Structure of movable body 5)
In the present embodiment, the magnetic drive mechanism 6 has a coil 60 held by the support 2 and a magnet 50 held by the movable body 5. The coil 60 is a tubular coil wound around the central axis, and in the movable body 5, the magnet 50 is a permanent magnet arranged inside the coil 60. In the permanent magnet, the south pole and the north pole are arranged in the L direction of the axis.

The movable body 5 has a first yoke 51 that overlaps the magnet 50 from one side L1 in the axis L direction inside the coil 60, and a side opposite to the first yoke 51 in the axis L direction with respect to the magnet 50 (in the axis L direction). It has a flat plate portion 521 that overlaps from the other side L2), and a second yoke 52 having a tubular body portion 522 extending from the edge of the flat plate portion 521 toward one side L1 in the axis L direction. In the present embodiment, the tubular body portion 522 extends to a position facing the first yoke 51 via the coil 60 in a direction intersecting the axis L direction (outward in the radial direction). The coil 60 has a cylindrical shape, the flat plate portion 521 of the first yoke 51, the magnet 50, and the second yoke 52 has a disc shape, and the tubular body portion 522 has a cylindrical shape.

Here, at the boundary between the flat plate portion 521 and the tubular body portion 522 of the second yoke 52, a plurality of ventilation holes 523 are provided at positions where the coil 60 overlaps in the axis L direction. In this embodiment, the flat plate portion 521 is provided with ventilation holes 523 at eight locations at equal angle intervals. Further, in the flat plate portion 521, through holes 524 are provided at three positions at equal angular intervals at substantially intermediate positions in the radial direction.

Further, holes 515, 505, and 525 are formed in the center of the flat plate portion 521 of the first yoke 51, the magnet 50, and the second yoke 52, and the holes 515, 505, and 525 overlap in the axis L direction. There is. Therefore, at the center of the movable body 5, a through hole 55 that penetrates the movable body 5 in the axis L direction is provided by the holes 515, 505, and 525, respectively.

(Structure of elastic member 8)
In the present embodiment, the elastic member 8 is a viscoelastic member 80 provided between the outer peripheral surface 56 of the movable body 5 and the second wall portion 43 of the second support member 4. In the present embodiment, the viscoelastic member 80 has a tubular shape extending between the outer peripheral surface 56 of the movable body 5 and the second wall portion 43 of the second support member 4 so as to surround the movable body 5 over the entire circumference. ..

Viscoelasticity is a property that combines both viscosity and elasticity, and is a property that is prominently found in polymer substances such as plastics and rubber. Therefore, various gel members can be used as the viscoelastic member 80. Further, as the viscoelastic member 80, natural rubber, diene rubber (for example, styrene / butadiene rubber, isoprene rubber, butadiene rubber), chloroprene rubber, acrylonitrile / butadiene rubber, etc.), non-diene rubber (for example, butyl rubber, ethylene / Various rubber materials such as propylene rubber, ethylene / propylene / diene rubber, urethane rubber, silicone rubber, fluororubber, etc., and thermoplastic elastomers, and modified materials thereof may be used.

In this embodiment, a gel-like member 81 (gel-like damper member) such as a silicone gel is used as the viscoelastic member 80. Silicone gels with a needle insertion degree of 80 to 110 degrees are used. The degree of needle insertion is defined by JIS-K-2207 and JIS-K-2220, and the smaller this value is, the harder it is.

In the present embodiment, the outer peripheral surface 56 of the movable body 5 is the tubular body portion 522 of the second yoke 52. Therefore, the viscoelastic member 80 extends so as to surround the movable body 5 between the tubular body portion 522 of the second yoke 52 and the second wall portion 43 of the second support member 4. Further, since the tubular body portion 522 of the second yoke 52 and the second wall portion 43 of the second support member 4 each have a circumferential surface, the viscoelastic member 80 is cylindrical. In this embodiment, the center of gravity of the movable body 5 and the center of the viscoelastic member 80 in the Z-axis direction coincide with each other in the Z-axis direction. Therefore, there is an advantage that the movable body 5 is difficult to tilt.

Here, the viscoelastic member 80 is joined to the tubular body portion 522 of the second yoke 52 and the second wall portion 43 of the second support member 4 by the adhesiveness of the viscoelastic member 80 itself. That is, in the present embodiment, a viscoelastic member is formed between the outer peripheral surface 56 of the movable body 5 and the second wall portion 43 of the support 2, and at that time, the viscoelastic member 80 itself causes the movable body 5 to adhere. It is assumed that the viscoelastic member 80 is joined to the outer peripheral surface 56 (cylindrical body portion 522) and the second wall portion 43 of the support body 2. More specifically, a material for forming a silicone gel is filled between the outer peripheral surface 56 of the movable body 5 and the second wall portion 43 of the support 2, and then cured to form the viscoelastic member 80. .. At that time, due to the adhesiveness of the viscoelastic member 80 itself, the viscoelastic member 80 is joined to the outer peripheral surface 56 (cylindrical body portion 522) of the movable body 5 and the second wall portion 43 of the support body 2. It will be in a state of being. Therefore, since it is not necessary to bond with an adhesive, the viscoelastic member 80 can be easily joined to the movable body 5 and the support 2 between the movable body 5 and the support 2.

In this embodiment, the tubular body portion 522 and the second support member 4 of the second yoke 52 are in the state of the second yoke 52 before assembling the movable body 5 and the second support member 4 before assembling the support 2. After forming the viscoelastic member 80 with the second wall portion 43, the actuator 1 is assembled. Therefore, the viscoelastic member 80 can be easily molded.

Further, as shown in FIG. 4, the end portion 526 of one side L1 of the tubular body portion 522 in the axis L direction, the end portion 86 of one side L1 of the viscoelastic member 80 in the axis L direction, and the second wall portion 43. The end portion 436 of one side L1 in the axis L direction has the same position in the axis L direction and overlaps in the radial direction. Therefore, when the viscoelastic member 80 is molded, the gap between the tubular body portion 522 and the second wall portion 43 that opens toward one side L1 in the axis L direction can be easily closed with a flat plate or the like. Therefore, the viscoelastic member 80 can be easily molded.

In the elastic member 8 (viscoelastic member 80) configured in this way, the gel-like member 81 has linear or non-linear expansion / contraction characteristics depending on the expansion / contraction direction. For example, when the plate-shaped gel-like member 81 is pressed in the thickness direction and compressed and deformed, the non-linear component has a larger expansion and contraction characteristic than the linear component, while the plate-shaped gel-like member 81 is pulled and stretched in the thickness direction. Has a stretch characteristic in which the linear component is larger than the non-linear component. Also, when deforming in the direction intersecting the thickness direction (shearing direction), the linear component has a larger deformation characteristic than the non-linear component. In this embodiment, the viscoelastic member 80 is configured to be deformed in the shearing direction when the movable body 5 vibrates in the Z-axis direction. Therefore, since the viscoelastic member 80 is deformed in a range of high linearity, it is possible to obtain vibration characteristics with good linearity.

(Heat dissipation structure of coil 60)
When power is supplied to the coil 60 in the actuator 1, the coil 60 generates heat. In particular, in the present embodiment, the coil 60 is covered from the outside in the radial direction by the tubular body portion 522 of the second yoke 52 of the movable body 5. Further, on the radial outer side of the tubular body portion 522, the space between the tubular body portion 522 and the second wall portion 43 of the second support member 4 is closed by the viscoelastic member 80 over the entire circumference. Even in this case, since a plurality of ventilation holes 523 are provided at positions where the coil 60 overlaps the coil 60 in the axis L direction in the second yoke 52, the inside of the second yoke 52 when the movable body 5 is vibrated in the axis L direction. Air enters and exits through the ventilation hole 523. Therefore, since the coil 60 can be cooled by the air entering and exiting the ventilation hole 523 of the second yoke 52, the temperature rise of the coil 60 can be suppressed.

Further, in the support body 2, the second support member 4 is provided with a window 41 that opens the flat plate portion 521 of the second yoke 52 of the movable body 5 toward the other side L2 in the axis L direction. Therefore, when the movable body 5 is vibrated in the L direction of the axis, air enters and exits from the inside of the support 2 through the window 41. Further, the movable body 5 is provided with a through hole 55. Therefore, when the movable body 5 is vibrated in the L direction of the axis, air enters and exits through the through hole 55 and the window 41. Therefore, since the coil 60 can be cooled, the temperature rise of the coil 60 can be suppressed.

Further, in the support body 2, an opening 325 is provided in the end plate portion 31 of the first support member 3. Therefore, when the movable body 5 is vibrated in the axis L direction, air enters and exits from the inside of the support 2 through the opening 325. Therefore, since the coil 60 can be cooled, the temperature rise of the coil 60 can be suppressed. However, when the actuator 1 is used as a panel speaker described later, the opening 325 is in a closed state, and in this case, the opening 325 does not contribute to heat dissipation.

(Fixing structure of coil holder 61 to first support member 3)
FIG. 6 is an enlarged perspective view showing a fixed structure of the coil holder 61 with respect to the first support member 3 shown in FIG. FIG. 7 is an enlarged plan view showing a fixed structure of the coil holder 61 with respect to the first support member 3 shown in FIG. FIG. 8 is an enlarged perspective view showing a fixed structure of the coil holder 61 with respect to the first support member 3 shown in FIG. FIG. 9 is a cross-sectional view schematically showing how the claw portion 615 shown in FIG. 6 is engaged with the first engaging portion 326. Note that in FIGS. 6 to 9, the coil 60 is not shown.

As shown in FIGS. 6, 7, 8 and 9, in the present embodiment, when the coil holder 61 is fixed to the first support member 3, the coil holder 61 is a tubular portion that holds the coil 60. It has an engaging plate portion 613 having a claw portion 615 bent on one side L1 in the axial direction L direction of 611 and one side in the radial direction. Here, the engaging plate portions 613 are formed at a total of six locations at equal angle intervals. In the present embodiment, each of the six engaging plate portions 613 is provided with a protruding portion 614 protruding from the tubular portion 611 to one side L1 in the axis L direction, and the claw portion 615 is in the axis L direction of the protruding portion 614. It is bent to one side in the radial direction at the end of L1 on one side. In this embodiment, the claw portion 615 is bent inward in the radial direction.

Corresponding to such a structure, in the thick portion 323 of the end plate portion 31 of the first support member 3 that overlaps the coil holder 61 on one side L1 in the axis L direction, the first opening that overlaps the claw portion 615 in the axis L direction. The 324 is formed so as to extend from the outer edge of the thick portion 313 in the radial direction. Here, the width dimension of the first opening 324 is larger than that of the claw portion 615 in the circumferential direction, and the length dimension in the radial direction is also larger than that of the claw portion 615.

Further, the end plate portion 31 is formed with a first engaging portion 326 facing the one side L1 in the axis L direction at a position adjacent to the first opening 324 on one side CW in the circumferential direction. The claw portion 615 elastically contacts and engages with the 1 engaging portion 326 from one side L1 in the axis L direction. Further, the tubular portion 611 of the coil holder 61 is in contact with the end plate portion 31 from the other side L2 in the axis L direction. Therefore, the coil holder 61 is held by the end plate portion 31. Further, a second engaging portion 327 projecting from the end of the CW on one side in the circumferential direction of the first engaging portion 326 to L1 on one side in the axis L direction is provided, and the claw portion 615 is provided in the circumferential direction. It abuts and engages with the second engaging portion 327 from one side CW.

More specifically, the end plate portion 31 has a position with respect to the first opening 324 at a position overlapping the first engaging portion 326 of the end surface 310 of one side L1 of the end plate portion 31 in the axis L direction. A second opening 328 communicating in the circumferential direction is open, and a first engaging portion 326 is formed by the bottom of the second opening 328. Here, the second opening 328 is a slit-shaped opening extending in the radial direction along the end of the CW on one side in the circumferential direction of the first opening 324, and is the circumference of the second opening 328. The end of the CCW on the other side in the direction overlaps with the end of the CW on the one side in the circumferential direction of the first opening 324 and communicates with the first opening 324. On the other hand, the second engaging portion 327 is formed by the wall portion of the CW on one side in the circumferential direction of the second opening 328, and the claw portion 615 is formed in the second engaging portion 327 in the circumferential direction. It is in contact from one side CW. As a result, the claw portion 615 is separated from the wall surface 324a of the CCW on the other side in the circumferential direction of the first opening 324 to the CW on the one side in the circumferential direction.

Further, in the end plate portion 31, a third opening portion 329 penetrating the end plate portion 31 so as to connect with the first opening portion 324 and the second opening portion 328 is along the boundary between the outer peripheral portion 322 and the thick portion 323. It is formed in an arc shape.

Here, the first opening 324 includes a bottom wall 314, and the claw portion 615 has a first portion 616 located on one side CW in the circumferential direction with the first engaging portion 326 on one side L1 in the axis L direction. The second portion 617 located on the other side CCW in the circumferential direction from the first portion 616 of the claw portion 615 overlaps the bottom wall 314 from the other side L2 in the axis L direction.

As described above, in the actuator 1 of the present embodiment, the coil 60 is held by the tubular portion 611 of the coil holder 61, and the coil holder 61 is held by the first support member 3 of the support body 2. Further, the coil holder 61 has an engaging plate portion 613 having a claw portion 615 bent on one side L1 in the axial direction L direction and one side in the radial direction of the tubular portion 611, while the coil holder 61 in the support 2 has a coil holder 61. The end plate portion 31 that overlaps with one side L1 in the axis L direction has a first opening 324 that opens toward the other side L2 in the axis L direction and a CW on one side in the circumferential direction with respect to the first opening 324. A first engaging portion 326 facing L1 on one side in the L direction of the axis is provided at positions adjacent to each other. Therefore, in the coil holder 61, the claw portion 615 is bent in the radial direction in advance, the claw portion 615 is inserted into the first opening 324, and then the coil holder 61 is rotated to one side CW in the circumferential direction. And the claw portion 615 engages with the first engaging portion 326 from one side L1 in the axis L direction. Therefore, since it is not necessary to bond the coil 60 to the support 2, the coil 60 can be efficiently mounted on the support 2. Further, since the claw portion 615 of the coil holder 61 is bent in the radial direction in advance, for example, unlike the case where the claw portion 615 is inserted into the slit and then bent, the claw portion 615 can be bent deeply, and the claw portion 615 can be bent deeply. Springback that causes the portion 615 to return to its original shape is unlikely to occur. Therefore, even if the claw portion 615 is not adhered to the support 2, the engagement of the claw portion 615 is difficult to loosen when the movable body 5 is vibrated. Occurrence can be suppressed.

Further, a second engaging portion 327 is provided, which projects from the end of the one-sided CW in the circumferential direction of the first engaging portion 326 to the one-sided L1 in the axis L direction, and the claw portion 615 comes into contact with the one-sided CW in the circumferential direction. Therefore, after inserting the claw portion 615 into the first opening 324, the coil holder 61 can be rotated to one side CW in the circumferential direction until the claw portion 615 abuts on the second engaging portion 327. The claw portion 615 can be reliably engaged with the first engaging portion 326.

Further, since the end plate portion 31 has a second opening 328 that communicates with the first opening 324 in the circumferential direction and has the first engaging portion 326 as the bottom, the first support member 3 The first engaging portion 326 and the second engaging portion 327 can be formed without using a complicated and expensive mold. Further, since the bottom of the second opening 328 is the first engaging portion 326, the claw portion 615 and the first engaging portion 326 are recessed from the end surface 310 of the end plate portion 31 to the other side L2 in the axis L direction. Can be engaged with. Therefore, it is possible to prevent the claw portion 615 from protruding from the end surface 310 of the end plate portion 31.

Further, since the first opening 324 includes the bottom wall 314, when the claw portion 615 is inserted into the inside of the first opening 324, the claw portion 615 is first inserted until the claw portion 615 comes into contact with the bottom wall 314. When inserted into the opening 324 and then the coil holder 61 is rotated to one side CW in the circumferential direction, the claw portion 615 engages with the first engaging portion 326 from one side L1 in the axis L direction. Therefore, the coil 60 can be efficiently mounted on the support 2 via the coil holder 61.

(basic action)
In the actuator 1 of the present embodiment, when an alternating current is applied to the coil 60, the movable body 5 vibrates in the Z-axis direction, so that the center of gravity of the actuator 1 fluctuates in the Z-axis direction. Therefore, the user who holds the actuator 1 as a tactile device can experience the vibration in the Z-axis direction. At that time, by adjusting the AC waveform applied to the coil 60, the acceleration at which the movable body 5 moves to one side Z1 in the Z-axis direction and the acceleration at which the movable body 5 moves to the other side Z2 in the Z-axis direction are different. Then, the user can experience the directional vibration in the Z-axis direction.

Further, as described below, the panel speaker can be configured by fixing the actuator 1 to the diaphragm and applying a signal having a predetermined waveform to the coil 60.

(Panel speaker 100)
FIG. 10 is an explanatory diagram of the panel speaker 100 provided with the actuator 1 shown in FIG. FIG. 11 is an enlarged explanatory view showing a fixed portion between the actuator 1 and the diaphragm 110 shown in FIG. 10.

As shown in FIGS. 10 and 11, the panel speaker 100 is configured by fixing the end plate portion 31 of the support 2 of the actuator 1 in the Z-axis direction to the back surface 111 of the diaphragm 110. Therefore, since a chassis or the like for fixing the actuator 1 is not required on the back surface 111 side of the diaphragm 110, the panel speaker 100 can be made thinner.

In such a panel speaker 100, when an alternating current is applied to the coil 60 of the actuator 1, the movable body 5 vibrates in the Z-axis direction, and the reaction force is transmitted to the diaphragm 110. Therefore, as a result of the diaphragm 110 vibrating, a sound corresponding to the alternating current applied to the coil 60 is generated from the front surface 112 of the diaphragm 110. Here, the diaphragm 110 is a display panel such as an organic electroluminescence display panel, and the sound corresponding to the displayed image is emitted from the diaphragm 110.

In this embodiment, the flat surface portion 315 of the end plate portion 31 is fixed to the diaphragm 110 via an adhesive layer or the like, and the protruding portion 316 is brought into contact with the diaphragm. For example, the flat surface portion 315 is fixed to the diaphragm 110 by the double-sided tape 150 provided with the adhesive layers 152 and 153 on both sides of the sheet 151. Therefore, of the end plate portions 31, only the protruding portion 316 comes into contact with the diaphragm 110, so that the contact area between the end plate portion 31 and the diaphragm 110 is narrow. Therefore, the variation in the flatness of the protruding portion 316 and the like is unlikely to affect the characteristics of the panel speaker 100, so that a situation such as a decrease in the sound pressure level in the high frequency range of the panel speaker 100 is unlikely to occur.

Further, since the protruding portion 316 is arranged so as to surround the axis L (central axis) of the movable body 5, such as being formed in an annular shape extending along the edge of the opening 325, the end plate portion When the 31 and the diaphragm 110 are fixed, the protruding portion 316 comes into contact with the diaphragm 110 in a stable state. Therefore, it is unlikely that the sound pressure level of the panel speaker 100 in the high frequency range will be lowered.

Further, in the center of the movable body 5, a through hole 55 that penetrates the movable body 5 in the Z-axis direction by holes 515, 505, and 525 provided in each of the first yoke 51, the magnet 50, and the second yoke 52. Is provided. Therefore, when the movable body 5 vibrates in the Z-axis direction, the through hole 55 functions as an air vent hole, so that the movable body 5 can be vibrated smoothly.

Although FIG. 10 illustrates an embodiment in which the diaphragm 110 is provided with two actuators 1, one actuator 1 or three or more actuators 1 may be provided depending on the magnitude of the sound to be output. ..

[Embodiment 2]
FIG. 12 is an explanatory view of the actuator 1 according to the second embodiment of the present invention, and schematically shows how the claw portion 615 of the coil holder 61 is engaged with the first engaging portion 326 of the first support member 3. It is a cross-sectional view shown in. Since the basic configurations of this embodiment and the third, fourth, and fifth embodiments described later are the same as those of the first embodiment, the common parts are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 12, also in the present embodiment, as in the first embodiment, the end plate portion 31 of the first support member 3 is located adjacent to the first opening 324 on one side CW in the circumferential direction. One engaging portion 326 is formed, and a claw portion 615 is engaged with the first engaging portion 326 from one side L1 in the axis L direction. In the present embodiment, the claw portion 615 is provided with a misalignment prevention portion 615a that projects to one side L1 in the axis L direction and can abut on the bottom wall 314 of the first opening 324 from the one side CW in the circumferential direction. ing. Therefore, it is unlikely that the coil holder 61 will rotate to the CCW on the other side in the circumferential direction and the claw portion 615 will come off from the first opening 324.

[Embodiment 3]
FIG. 13 is an explanatory view of the actuator 1 according to the third embodiment of the present invention, and schematically shows how the claw portion 615 of the coil holder 61 is engaged with the first engaging portion 326 of the first support member 3. It is a cross-sectional view shown in. As shown in FIG. 13, also in the present embodiment, as in the first embodiment, the end plate portion 31 of the first support member 3 is located adjacent to the first opening 324 on one side CW in the circumferential direction. One engaging portion 326 is formed, and a claw portion 615 is engaged with the first engaging portion 326 from one side L1 in the axis L direction. In the present embodiment, the bottom wall 314 of the first opening 324 is provided with a misalignment prevention portion 314a that projects to the other side L2 in the axis L direction and allows the claw portion 615 to come into contact with the one side CW in the circumferential direction. There is. Therefore, it is unlikely that the coil holder 61 will rotate to the CCW on the other side in the circumferential direction and the claw portion 615 will come off from the first opening 324.

[Embodiment 4]
FIG. 14 is an explanatory view of the actuator 1 according to the fourth embodiment of the present invention, and schematically shows how the claw portion 615 of the coil holder 61 is engaged with the first engaging portion 326 of the first support member 3. It is a cross-sectional view shown in. As shown in FIG. 14, also in the present embodiment, as in the first embodiment, the end plate portion 31 of the first support member 3 is located adjacent to the first opening 324 on one side CW in the circumferential direction. One engaging portion 326 is formed, and a claw portion 615 is engaged with the first engaging portion 326 from one side L1 in the axis L direction. Here, the first opening 324 is not provided with the bottom wall 314 described with reference to FIG. 9 and the like. Therefore, in the claw portion 615, the first portion 616 located on one side CW in the circumferential direction engages with the first engaging portion 326 from the one side L1 in the axis L direction, and the first portion 616 of the claw portion 615 The second portion 617 located on the other side CCW in the circumferential direction is not in contact with the end plate portion 31.

[Embodiment 5]
FIG. 15 is an explanatory view of the actuator 1 according to the fifth embodiment of the present invention, and schematically shows how the claw portion 615 of the coil holder 61 is engaged with the first engaging portion 326 of the first support member 3. It is a cross-sectional view shown in. As shown in FIG. 15, also in the present embodiment, as in the first embodiment, the end plate portion 31 of the first support member 3 is located adjacent to the first opening 324 on one side CW in the circumferential direction. One engaging portion 326 is formed, and a claw portion 615 is engaged with the first engaging portion 326 from one side L1 in the axis L direction. Here, the first opening 324 is not provided with the bottom wall 314 described with reference to FIG. 9 and the like. Further, the second opening 328 is shallower than the second opening 328 described with reference to FIG. 9 and the like. Therefore, the claw portion 615 slightly protrudes from the end plate portion 31 from one side L1 in the axis L direction.

[Embodiment 6]
In the above embodiment, the coil holder 61 is fixed to the end plate portion 31 only by engaging the coil holder 61 with the claw portion 615, but an adhesive is applied to the engaging portion between the first engaging portion 326 and the claw portion 615. You may.

1 ... Actuator, 2 ... Support, 3 ... First support member, 4 ... Second support member, 5 ... Movable body, 6 ... Magnetic drive mechanism, 8 ... Elastic member, 21 ... First boundary part, 22 ... Second Boundary part, 31 ... end plate part, 33 ... first wall part, 34 ... first outer edge part, 35, 45 ... corner part, 36, 46 ... side part, 41 ... window, 352 ... cylindrical part, 43 ... second Wall, 44 ... 2nd outer edge, 50 ... Magnet, 51 ... 1st yoke, 52 ... 2nd yoke, 55 ... Through hole, 56 ... Outer surface, 60 ... Coil, 61 ... Coil holder, 80 ... Viscoelastic member , 81 ... gel-like member, 100 ... panel speaker, 110 ... diaphragm, 150 ... double-sided tape, 151 ... sheet, 152, 153 ... adhesive layer, 220 ... gap, 314 ... bottom wall, 315 ... flat surface, 316 ... protrusion Part, 320 ... bottom, 324 ... first opening, 325 ... opening, 326 ... first engaging part, 327 ... second engaging part, 328 ... second opening, 329 ... third opening, 331 ... Convex part, 521 ... Flat plate part, 522 ... Cylindrical body part, 523 ... Vent hole, 611 ... Cylindrical part, 613 ... Engagement plate part, 614 ... Protruding part, 615 ... Claw part, 616 ... First part, 617 ... second part, 314a, 615a ... misalignment prevention part, L ... axis, L1, CW ... one side, L2, CCW ... other side

Claims (11)

A coil holder that holds a tubular coil wound around the axis,
A support that holds the coil holder and
A movable body supported by an elastic member with respect to the support,
A magnetic drive mechanism having a magnet held by the movable body and moving the movable body in the axial direction in which the axis extends with respect to the support.
Have,
The coil holder has a tubular portion extending around the axis and holding the coil, and a claw bent on one side of the tubular portion in the axial direction and one side in the radial direction centered on the axis. With an engaging plate part with a part,
The support includes an end plate portion that overlaps the coil holder on one side in the axial direction.
The end plate portion opens toward the other side in the axial direction, and has a first opening having a larger width dimension in the circumferential direction around the axis than the claw portion, and a circumferential direction with respect to the first opening. It is characterized in that it is formed at positions adjacent to each other on one side so as to face one side in the axial direction, and has a first engaging portion in which the claw portion engages from one side in the axial direction. Actuator to do. In the actuator according to claim 1,
The engaging plate portion includes a protruding portion protruding from the tubular portion on one side in the axial direction.
An actuator characterized in that the claw portion is bent to one side in the radial direction at an end portion of the protruding portion on one side in the axial direction. In the actuator according to claim 1 or 2.
The end plate portion projects from one end of the first engaging portion in the circumferential direction to one side in the axial direction, and the claw portion abuts from one side in the circumferential direction. An actuator characterized by having a part. In the actuator according to any one of claims 1 to 3,
An actuator characterized in that the claw portion is bent inward in the radial direction. In the actuator according to any one of claims 1 to 4.
The end plate portion has a second end surface having the first engaging portion as a bottom portion of the end surface of the end plate portion on one side in the axial direction at a position overlapping the first engaging portion when viewed from the axial direction. With an opening,
The actuator characterized in that the second opening communicates with the first opening in the circumferential direction. In the actuator according to claim 5,
The first opening includes a bottom wall and
In the claw portion, a first portion located on one side in the circumferential direction engages with the first engaging portion from one side in the axial direction, and the other portion in the circumferential direction from the first portion of the claw portion. An actuator characterized in that a second portion located on the side overlaps the bottom wall from the other side in the axial direction. In the actuator according to claim 6,
The actuator is characterized in that the claw portion protrudes to one side in the axial direction and has a misalignment prevention portion capable of contacting the bottom wall from one side in the circumferential direction. In the actuator according to claim 6,
An actuator characterized in that the bottom wall has a misalignment prevention portion that projects to the other side in the axial direction and allows the claw portion to come into contact with one side in the circumferential direction. In the actuator according to any one of claims 1 to 8.
The support is an actuator characterized in that the end plate portion is made of a resin material. A panel speaker comprising the actuator according to any one of claims 1 to 9.
A panel speaker characterized in that the support is fixed to a diaphragm. In the panel speaker according to claim 10,
The diaphragm is a panel speaker characterized by being a display panel.

Images