Exciter and method for bonding the exciter

Abstract

We provide technology to simplify the configuration of exciters. [Solution] The exciter comprises a frame, a movable part that vibrates relative to the frame in response to an electrical signal input, and a support part that extends from the frame in a direction perpendicular to the vibration direction of the movable part, and has a mounting portion at the end away from the frame in that extension direction, which is attached to a member to be attached, and which supports the frame.

Description

Technical Field

[0001] The present invention relates to an exciter and a method for adhering the exciter.

Background Art

[0002] Conventionally, a panel speaker that generates sound by vibrating a panel has been proposed. For example, in Patent Document 1, there is proposed a speaker device including an interior panel made of a foamed member formed on the back surface side of the skin facing the passenger compartment of a vehicle, and an exciter connected to the interior panel, which vibrates the interior panel to generate sound.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A conventional exciter has a gap between a movable part that vibrates a diaphragm (panel) and a magnetic circuit. The magnetic circuit is pressed against the movable part so as to eliminate the gap, and the movable part is pressed against the diaphragm, and the movable part and the diaphragm are adhered. At this time, a cushioning material is provided between the frame including the magnetic circuit and the diaphragm, and it is in a compressed state by the pressing force applied to the magnetic circuit. Then, after adhesion, when the pressing force of the magnetic circuit is released, the frame and the magnetic circuit return to their original positions by the elastic force of the cushioning material. This cushioning material is only used during adhesion and then becomes a useless part that is not used during the operation of the exciter or the like.

[0005] An object of the present invention is to provide a technique for simplifying the configuration of an exciter.

Means for Solving the Problems

[0006] To address the above issues, the exciter described herein is: Frame and, A movable part that vibrates relative to the frame in response to an electrical signal input, A support portion that supports the frame extends from the frame in a direction perpendicular to the vibration direction of the movable part, and has a mounting portion at the end away from the frame in that extension direction, which is attached to the member to be attached, and supports the frame, It is equipped with. [Effects of the Invention]

[0007] This invention can provide a technique for simplifying the configuration of an exciter. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view of the panel-type speaker of the first embodiment, viewed in a direction parallel to the panel surface. [Figure 2] Figure 2 is a perspective view of the exciter. [Figure 3] Figure 3 shows the bonding method used when bonding the exciter to the diaphragm. [Figure 4] Figure 4 shows an example of a panel-type speaker constructed by bonding an exciter without a support to a diaphragm, as a comparative example. [Figure 5] Figure 5 shows the configuration of a panel-type speaker according to the second embodiment. [Figure 6] Figure 6 shows the configuration of a modified panel-type speaker. [Modes for carrying out the invention]

[0009] The configuration of the following embodiment is illustrative, and the present invention is not limited to the configuration of this embodiment. This embodiment is an example of an exciter that is bonded to a vibrating member and vibrates a diaphragm in response to an input signal, thereby outputting sound from the diaphragm. This exciter and a panel-shaped vibrating member (hereinafter also referred to as a diaphragm) constitute a so-called panel-type speaker. The diaphragm is not particularly limited in shape as long as it can be vibrated by the exciter, and may be flat or curved. Furthermore, if a display panel is used as the diaphragm and the exciter is bonded to this display panel, a display speaker is constructed. That is, the exciter of this embodiment can be applied to a device equipped with a display panel, and can output sound from the display panel.

[0010] <First Embodiment> Figure 1 is a cross-sectional view of the panel-type speaker 100 of this embodiment, viewed in a direction parallel to the panel surface, and Figure 2 is a perspective view of the exciter 70. In Figure 1, the x-direction is the left-right direction of the panel-type speaker 100, the y-direction is the up-down direction of the panel-type speaker 100, and the z-direction is the front-back direction of the panel-type speaker 100. Note that these directions are shown for the convenience of explanation and are not limited to them. For example, the orientation of the panel-type speaker 100 is not limited to these directions.

[0011] The panel-type speaker 100 comprises a diaphragm 10 and an exciter 70. In this embodiment, the diaphragm 10 is a flat panel. The diaphragm 10 may also be a display element such as a liquid crystal display or an OLED (organic light emitting diode) display. A boss (mounting portion) 12 for attaching the exciter 70 is provided on the back surface 11 of the diaphragm 10.

[0012] The exciter 70 comprises a frame 20 including a magnetic circuit 50, a movable part 30, and a support part 40. The magnetic circuit 50 comprises a yoke 54, a magnet 55, and a pole piece 56. The yoke 54 is a magnetic material formed to surround the magnet 55. In this embodiment, the yoke 54 has a disc-shaped back plate 541 positioned on the back of the magnet 55 and a generally cylindrical peripheral wall portion 542 surrounding the outer circumference of the magnet 55. However, the yoke 54 may also be formed by bending a strip-shaped plate to surround the back of the magnet 55 and a part of its peripheral wall. The pole piece 56 is a short cylindrical (disc-shaped) magnetic material.

[0013] The magnet 55 is a cylindrical permanent magnet, with the backplate 541 of the yoke 54 connected to one pole side (back side) and the pole piece 56 connected to the other pole side (front side). A gap 551 is formed between the front end 543 of the yoke 54 and the circumferential surface of the pole piece 56, into which the coil of the movable part 30 is inserted. The yoke 54 and the pole piece 56 guide the magnetic flux from the magnet 55 and form a magnetic field in the gap 551 to drive the coil.

[0014] The movable part 30 includes a coil 31, a damper 32, a coupler 33, and an adhesive member 34. The coil 31 is formed by wrapping conductive wires around the outer circumference of a cylindrical core made of paper, glass fiber foil, synthetic resin, etc. The front end of the coil 31 is fixed to the coupler 33. The coil 31 is then inserted into the gap 551 between the yoke 54 and the pole piece 56. The coupler 33 is generally a disc-shaped member, and an adhesive member 34 is provided on its front side. The material of the adhesive member 34 is not particularly limited, but it may be, for example, an acrylic resin adhesive, a urethane resin adhesive, an epoxy resin adhesive, a silicone adhesive, etc. Alternatively, the adhesive member 34 may be an adhesive sheet in which the adhesive (tack) is formed in a sheet shape. The movable part 30 is bonded to the diaphragm 10 by the adhesive member 34 being pressed against the back surface of the diaphragm 10. Details of the bonding method will be explained later. The damper 32 is an elastic, circular band-shaped member that connects the coupler 33 and the frame 20. When an AC signal (input signal) corresponding to the waveform of sound is input to the conductive wire of the coil 31, the movable part 30 vibrates due to the interaction between the magnetic force generated in the coil 31 and the magnetic field of the gap 551.

[0015] The frame 20 is a generally cylindrical member, and holds a magnetic circuit in the inner space of the cylinder. An arm-shaped support portion 40 is provided on the outer circumferential surface 21 of the frame 20. The support portion 40 extends away from the frame 20 in a direction perpendicular to the vibration direction (Z direction) of the movable portion 30 (X direction or Y direction). Note that the support portion 40 is not limited to an arm shape, but may have other shapes such as a flange shape. The support portion 40 has a mounting portion 41 at the end on the side away from the frame 20 in the extension direction, which is attached to the member to be attached. In this embodiment, the mounting portion 41 is a flat plate-shaped end piece through which a screw is passed. In this embodiment, the member to be attached is a boss 12 provided on the back surface 11 of the diaphragm 10. The support portion 40 supports the frame 20 at a predetermined position relative to the back surface 11 of the diaphragm 10 by fastening the mounting portion 41 to the boss 12 with a screw 61. At this time, the movable part 30 and the magnetic circuit 50, which are bonded to the diaphragm 10, are positioned with a gap between them in the vibration direction (Z direction) of the movable part 30. For example, a gap is provided between the coupler 33 and the pole piece 56, and between the coil 31 and the back plate 541. This prevents the movable part 30 from interfering with the magnetic circuit 50 and hindering vibration when it vibrates. Note that the exciter 70 may be attached not only by screw fastening, but also by fitting together with a mating part or locking with a locking claw.

[0016] Note that the support portion 40 is formed of, for example, synthetic resin or the like, has rigidity enough to keep the frame 20 in an appropriate position with respect to the vibrating movable portion 30, and has elasticity enough to allow the frame 20 to be displaced in the vibration direction during adhesion described later. That is, when the magnetic circuit 50 is pressed toward the diaphragm 10 during adhesion, the support portion 40 can be bent so as to bring the magnetic circuit 50 into contact with the movable portion 30. Further, when the pressing force on the magnetic circuit 50 is released, the support portion 40 is restored from the bending by its elasticity, and the magnetic circuit 50 and the frame 20 can be returned to their original positions (predetermined positions).

[0017] <Adhesion method> FIG. 3 is a diagram showing an adhesion method when the exciter 70 is adhered to the diaphragm 10. In step A, the exciter 70 is set on the back surface 11 of the diaphragm 10 so that the attachment site of the support portion 40 is located on the boss 12.

[0018] In step B, the back surface (pressing surface) 544 of the magnetic circuit 50, that is, the back surface of the back plate 541, is pressed. As a result, the support portion 40 is bent, the frame 20 and the magnetic circuit 50 are pushed into the diaphragm 10 side, the gap between the pole piece 56 of the magnetic circuit 50 and the coupler 33 disappears, and the pole piece 56 is pressed against the coupler 33. Thereby, the pressing force applied to the magnetic circuit 50 is transmitted to the adhesive member 34 via the pole piece 56, and the adhesive member 34 is pressed against the diaphragm 10, so that the exciter 70 is adhered to the diaphragm 10.<s

[0019] In step C, the pressing force on the magnetic circuit 50 is released, and the frame 20 and the magnetic circuit 50 are returned to their predetermined positions by the elasticity of the support portion 40. Thereby, the gap between the movable portion 30 and the magnetic circuit 50 is maintained so as not to interfere with the vibration of the movable portion 30.

[0020] In step D, a screw 61 is passed through the through hole 411 of the attachment site 41 of the support portion 40, and the support portion 40 is fastened to the boss 12 with the screw 61, and the attachment of the exciter 70 is completed.

[0021] <Comparative example> Figure 4 shows an example of a panel-type speaker 900 constructed by bonding an exciter 90 without a support portion 40 to the diaphragm 10, as a comparative example. The exciter 90 differs from the exciter 70 of this embodiment in that it does not have a support portion 40 and has a cushioning material 91, but the other components are the same.

[0022] In step E, the exciter 90 is set on the back surface 11 of the diaphragm 10 such that the back surface of the frame 20 is supported by the support portion (locking claw) 92. The support portion 92 is provided on the housing or the like, which is positioned in close proximity to the exciter 90. At this time, the cushioning material 91 is placed between the diaphragm-side end face of the frame 20 and the back surface 11 of the diaphragm 10.

[0023] In step F, the back surface (pressing surface) 544 of the magnetic circuit 50, i.e., the back surface of the back plate 541, is pressed. This pushes the frame 20 and the magnetic circuit 50 toward the diaphragm 10, compressing the cushioning material 91, eliminating the gap between the pole piece 56 of the magnetic circuit 50 and the coupler 33, and pressing the pole piece 56 against the coupler 33. As a result, the pressing force applied to the magnetic circuit 50 is transmitted to the adhesive member 34 via the pole piece 56, and the adhesive member 34 is pressed against the diaphragm 10, thereby bonding the exciter 90 to the diaphragm 10.

[0024] In step G, the pressing force on the magnetic circuit 50 is released, the frame 20 and magnetic circuit 50 are returned to their predetermined positions by the elasticity of the cushioning material 91, and the exciter 90 is supported by the support part 92, completing the installation.

[0025] Thus, in the comparative example, since a cushioning material 91 is used separately from the support part 92, there was a problem that the number of parts increased and costs tended to be higher.

[0026] <Effects of this embodiment> (1) The exciter 70 of this embodiment comprises a frame 20, a movable part 30 that vibrates relative to the frame 20 in response to an electrical signal input, and a support part 40. The support part 40 extends from the frame 20 in a direction perpendicular to the vibration direction of the movable part 30, and has a mounting portion 41 at the end on the side away from the frame 20 in the extension direction, which is attached to the member to be attached, and supports the frame 20. With this configuration, the exciter 70 of this embodiment has the function of the support part 40 supporting the frame 20 and the function of returning the frame 20 to a predetermined position after bonding, and since the cushioning material 91 is not required, the structure of the exciter 70 can be simplified.

[0027] (2) In this embodiment, the exciter 70 has a support portion 40 that has elasticity that allows the frame 20 to be displaced in the direction of vibration. With this configuration, even without using a cushioning material 91, the exciter 70 of this embodiment can return the frame 20 to a predetermined position by the elasticity of the support portion 40 after bonding.

[0028] (3) The exciter 70 of this embodiment further comprises a magnetic circuit 50 held by the frame 20, and the movable part 30 is positioned with a gap between it and the magnetic circuit 50 in the direction of vibration, and has an adhesive member 34 at the end opposite to the magnetic circuit 50. Furthermore, when the adhesive member 34 is bonded to the diaphragm 10, the support part 40 is bent, and the magnetic circuit 50 is pressed against the movable part to eliminate the gap, thereby pressing the adhesive member 34 of the movable part 30 against the vibrating member. With this configuration, the exciter 70 of this embodiment transmits the pressing force to the adhesive member 34 by bending the support part 40 during bonding, enabling bonding with a simple configuration.

[0029] (4) In this embodiment, when the pressing force that presses the magnetic circuit 50 against the movable part 30 is released, the deflection of the support part 40 is eliminated, and the magnetic circuit 50 is released from between the movable part 30. It is returned to its predetermined position with a gap. With this configuration, the exciter 70 of this embodiment can return the frame 20 to its predetermined position by the elasticity of the support part 40 after bonding, even without using the cushioning material 91, and the structure of the exciter 70 can be simplified.

[0030] <Second Embodiment> Figure 5 shows the configuration of the panel-type speaker 200 according to the second embodiment. The panel-type speaker 200 of this embodiment differs from the panel-type speaker 100 of the first embodiment in that a boss portion 35 is provided on the back surface (first surface) 331 of the coupler 33 in the exciter 70A, but the other configurations are the same.

[0031] The boss portion 35 extends from the first surface of the movable portion 30, i.e., the back surface 331 of the coupler 33, toward the magnetic circuit side. In this embodiment, the pole piece 56, magnet 55, and back plate 541 of the magnetic circuit 50 are provided with through holes 57 extending from the front side to the back side, and the boss portion 35 of the movable portion 30 is inserted into these through holes 57. The boss portion 35 is provided such that the end surface (second surface) 352 opposite to the back surface 331 of the coupler 33 is flush with the back surface 544 of the magnetic circuit 50.

[0032] As described above, in this embodiment, when the exciter 70A is bonded to the diaphragm 10, if the back surface 544 of the magnetic circuit 50 and the end face 352 of the boss portion are simultaneously pressed with a tool or the like, the boss portion 35 transmits the pressing force to the coupler 33, pressing the adhesive member 34 against the diaphragm 10. Therefore, the exciter 70A of this embodiment can reduce the amount of deflection of the support portion 40 during bonding. For example, if the boss portion 35 is not provided, and the gap between the coupler 33 and the pole piece 56 is large, and the support portion 40 is deflected until the pole piece 56 contacts the coupler 33, the load-bearing capacity of the support portion 40 will be exceeded, then the magnetic circuit 50 cannot be pressed and bonded. In contrast, in this embodiment, since the boss portion 35 transmits the pressing force, the exciter 70A can be bonded to the diaphragm 10 even if the gap between the coupler 33 and the pole piece 56 is large. Furthermore, the exciter 70A of this embodiment does not require the cushioning material 91 compared to the comparative example described above, thus simplifying the structure of the exciter 70A.

[0033] <Variations> Figure 6 shows the configuration of a modified panel speaker 300. Compared to the panel speaker 200 of the second embodiment, the height (length) of the boss portion 35 in the exciter 70B is different, but the other configurations are the same.

[0034] In this modified example, the end face 352 of the boss portion 35 is located on the back surface 331 side of the coupler 33 rather than the back surface 544 of the magnetic circuit 50 in the vibration direction (Z direction) of the movable portion 30. That is, the end face 352 of the boss portion 35 is located on the front side of the back surface 544 of the magnetic circuit 50. The length of the boss portion 35 in the Z direction is set such that the difference between the back surface 544 and the end face 352 is smaller than the gap between the pole piece 56 and the coupler 33.

[0035] As described above, in this embodiment of the exciter 70B, there is a step between the back surface 544 of the magnetic circuit 50 and the end surface 352 of the boss portion 35. Therefore, when the back surface 544 of the magnetic circuit 50 and the end surface 352 of the boss portion are pressed by one surface of a tool or the like, the magnetic circuit 50 is pressed first by the amount of this step. When the back surface 544 of the magnetic circuit 50 is pushed to the position of the end surface 352 of the boss portion 35, both the magnetic circuit 50 and the boss portion 35 are pressed, and the boss portion 35 transmits the pressing force to the coupler 33, allowing the adhesive member 34 to be pressed against the diaphragm 10. For this reason, the amount of deflection of the support portion 40 during bonding can be reduced in this modified exciter 70B. In addition, compared to the comparative example described above, the cushioning material 91 is not required in this embodiment of the exciter 70B, and the structure of the exciter 70B can be simplified. [Explanation of Symbols]

[0036] 10: Vibration plate 11: Back 12: Boss 20: Frame 21: Outer surface 30: Moving part 31: Coil 32: Damper 33: Coupler 34: Adhesive material 35: Boss Department 40: Support part 41: Mounting location 50: Magnetic Circuit 54: York 55: Magnet 56: Pole Piece 57: Through hole 61: Screw 70, 70A, 70B: Exciter 90: Exciter of the comparative example 91: Cushioning material 92: Support part 100, 200, 300: Panel-type speakers 331: Back 352: End face 411: Through hole 541: Backplate 542: Peripheral wall part 543: Front end 544: Back 551: Gap 900: Panel-type speaker as a comparative example

Claims

1. Frame and, A movable part that vibrates relative to the frame in response to an electrical signal input, A support portion that supports the frame extends from the frame in a direction perpendicular to the vibration direction of the movable part, and has a mounting portion at the end away from the frame in that extension direction, which is attached to the member to be attached, and supports the frame, An exciter equipped with [unclear].

2. The exciter according to claim 1, wherein the support portion has elasticity that allows the frame to be displaced in the direction of vibration.

3. The frame further comprises a magnetic circuit held within it. The movable part is positioned with a gap between it and the magnetic circuit in the direction of vibration, and has an adhesive member at the end opposite to the magnetic circuit. The exciter according to claim 2, wherein when the adhesive member is bonded to a vibrating member vibrated by the exciter, the support portion is bent and the magnetic circuit is pressed against the movable portion to eliminate the gap, thereby pressing the adhesive member of the movable portion against the vibrating member.

4. The exciter according to claim 3, wherein when the pressing force that presses the magnetic circuit against the movable part is released, the deflection of the support part is eliminated and the magnetic circuit returns to a predetermined position with a gap between it and the movable part.

5. The frame further comprises a magnetic circuit held within it. The exciter according to claim 1 or 2, wherein the movable part is arranged with a gap between it and the magnetic circuit in the direction of vibration, has an adhesive member at the end opposite to the magnetic circuit, and has a boss portion on the first surface on the magnetic circuit side for pressing the movable part toward the opposite side of the magnetic circuit.

6. The exciter according to claim 5, wherein the boss portion extends from the first surface toward the magnetic circuit in the vibration direction, and the second surface opposite to the first surface is arranged to be flush with the pressing surface located opposite the movable portion in the magnetic circuit, or to be located on the first surface side of the pressing surface.

7. The exciter according to claim 6, wherein when the adhesive member is bonded to a vibrating member vibrated by the exciter, the second surface of the boss portion and the pressing surface of the magnetic circuit are simultaneously pressed toward the vibrating member, and the adhesive member of the movable portion is pressed against the vibrating member.

8. The exciter comprises a frame, a movable part that vibrates relative to the frame in response to an electrical signal input, and a support part that extends from the frame in a direction perpendicular to the vibration direction of the movable part, and has a mounting portion at the end away from the frame in that extension direction for attachment to a member to be attached, and supports the frame. A method for bonding an exciter, wherein an adhesive member provided at one end of the movable part in the direction of vibration is pressed against a vibrating member vibrated by the exciter, thereby bonding the vibrating member and the movable part.

9. The method for bonding an exciter according to claim 8, wherein the support portion has elasticity that allows the frame to be displaced in the vibration direction.

10. The exciter further comprises a magnetic circuit held in the frame, The movable part is positioned with a gap between it and the magnetic circuit in the direction of vibration, and has an adhesive member at the end opposite to the magnetic circuit. The method for bonding an exciter according to claim 9, wherein when the adhesive member is bonded to a vibrating member vibrated by the exciter, the support portion is bent and the magnetic circuit is pressed against the movable portion to eliminate the gap, thereby pressing the adhesive member of the movable portion against the vibrating member.

11. The method for bonding an exciter according to claim 10, wherein when the pressing force that presses the magnetic circuit against the movable part is released, the deflection of the support part is eliminated and the magnetic circuit returns to a predetermined position with a gap between it and the movable part.

12. The exciter further comprises a magnetic circuit held in the frame, The method for bonding an exciter according to claim 8 or 9, wherein the movable part is arranged with a gap between it and the magnetic circuit in the direction of vibration, has an adhesive member at the end opposite to the magnetic circuit, and has a boss portion on the first surface on the magnetic circuit side for pressing the movable part toward the opposite side of the magnetic circuit.

13. The method for bonding an exciter according to claim 12, wherein the boss portion extends from the first surface toward the magnetic circuit in the vibration direction, and the second surface opposite to the first surface is arranged to be flush with the pressing surface located opposite the movable portion in the magnetic circuit, or to be located on the first surface side of the pressing surface.

14. The method for bonding an exciter according to claim 13, wherein when the adhesive member is bonded to a vibrating member vibrated by the exciter, the second surface of the boss portion and the pressing surface of the magnetic circuit are simultaneously pressed toward the vibrating member, and the adhesive member of the movable portion is pressed against the vibrating member.

Images