Speaker

Abstract

Provided is a speaker having a structure suitable for thickness reduction.　The speaker 10 is provided with a magnetic circuit 40, a first vibration part 20, and a second vibration part 30. The magnetic circuit 40 has a first magnet 42, a first magnetic member 41 attached to the first magnet 42, a first yoke 43 attached to the first magnet 42, and a second yoke 45. A first magnetic gap G1 is formed between the first yoke 43 and the first magnetic member 41, and a second magnetic gap G2 is formed between the first yoke 43 and the second yoke 45. Furthermore, the second vibration part 30 has a weight 39.

Description

[Technical field]

[0001] The present invention relates to a speaker. [Background technology]

[0002] Patent Document 1 discloses a speaker device for realizing high-quality sound reproduction. This speaker device includes a first magnetic circuit, a main body having a function of radiating sound waves, a second magnetic circuit formed integrally with the first magnetic circuit, and a vibration suppression unit. The main body has a first vibration unit driven by the first magnetic circuit, and the vibration suppression unit has a second vibration unit driven by the second magnetic circuit in the opposite direction to the first vibration unit. The second vibration unit provides the second magnetic circuit with vibration that cancels the vibration provided to the first magnetic circuit by the first vibration unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-13587 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above techniques leave room for improvement in terms of making the speakers thinner. An object of the present disclosure is to provide a speaker having a structure suitable for thinning. [Means for solving the problem]

[0005] A speaker according to a first aspect is a speaker comprising a magnetic circuit, a first vibrating part having a first bobbin, a first coil and a first damper, and a second vibrating part having a second bobbin, a second coil, a second damper and a weight, wherein the magnetic circuit comprises a first magnet, a first magnetic member attached to the first magnet, a first yoke attached to the first magnet and forming a first magnetic gap between it and the first magnetic member, and a second yoke forming a second magnetic gap between it and the first yoke.

[0006] In this aspect, the speaker includes a magnetic circuit, a first vibration part, and a second vibration part. The first vibrating part has a first bobbin, a first coil, and a first damper, and the second vibrating part has a second bobbin, a second coil, and a second damper.

[0007] In this embodiment, the magnetic circuit includes a first magnet, a first magnetic member, a first yoke, and a second yoke. The first yoke forms a first magnetic gap between the first magnetic member and the first yoke, and forms a second magnetic gap between the first yoke and the second yoke. Therefore, the first yoke can be used as a path for both the magnetic flux passing through the first magnetic gap and the magnetic flux passing through the second magnetic gap, making it possible to reduce the thickness of the magnetic circuit.

[0008] Here, the second vibration portion has a weight. Therefore, compared to an embodiment in which the second vibrating part does not have a weight, it is possible to reduce the amplitude of the second vibrating part while maintaining the force generated by the second vibrating part. As a result, the speaker can be made thinner. Note that making the speaker thinner means making the speaker smaller in the vibration direction (amplitude direction) of the first vibrating part, that is, making the overall height of the speaker smaller. In the embodiment described later, an example will be described in which the second vibration part vibrates to cancel the vibration of the entire speaker caused by the first vibration part. However, the first vibration part and the second vibration part of this embodiment are not limited to this. The second vibration part may vibrate in the same direction as the first vibration part in synchronization with each other, or may vibrate in a different manner for another function.

[0009] A speaker according to a second aspect is the speaker of the first aspect, wherein the second bobbin protrudes upward with respect to the weight.

[0010] In this embodiment, the second bobbin protrudes upward relative to the weight. In other words, the weight does not protrude toward the first vibrating portion, which is above the second bobbin. Therefore, for example, compared to a configuration in which the weight is arranged so as to be hooked onto the upper end of the second bobbin, it is easier to make the speaker thinner.

[0011] A speaker according to a third aspect is the speaker according to the first or second aspect, wherein the second damper has two elastic bodies, and the weight is disposed between the two elastic bodies.

[0012] In this embodiment, the second damper has two elastic bodies, which improves the symmetry and linearity of movement of the second vibration part during vibration. In addition, the weight is disposed between the two elastic bodies, so the weight does not adversely affect the thickness of the speaker.

[0013] A fourth aspect of the speaker is any one of the first to third aspects, wherein the second damper has a first elastic body and a second elastic body arranged to overlap in the vibration direction, the first elastic body has a recessed portion that is recessed in a direction approaching the second elastic body in the vibration direction, and the weight is arranged on the surface of the recessed portion opposite the second elastic body.

[0014] In this aspect, the second damper has a first elastic body and a second elastic body arranged to overlap in the vibration direction. The first elastic body has a recessed portion recessed in a direction approaching the second elastic body in the vibration direction, and the weight is arranged on a surface of the recessed portion opposite to the second elastic body. Therefore, there is no need to perform the task of disposing a weight between the first elastic body and the second elastic body, and it is possible to suppress dimensional expansion of the second vibrating part in the amplitude direction.

[0015] A speaker according to a fifth aspect is any one of the first to fourth aspects, wherein the weight is annular and surrounds the second bobbin. The weight is disposed at a radial distance from the second bobbin. The weight has a recess in a circumferential portion that increases the distance from the second bobbin.

[0016] In this aspect, the weight has a recess in a part in the circumferential direction that increases the distance from the second bobbin. Therefore, when soldering or the like is performed on the outer peripheral surface of the second bobbin, by providing a recess corresponding to the location where the soldering is performed, it is possible to prevent a short circuit between the second bobbin and the weight caused by solder residue or other metal parts, etc.

[0017] A speaker according to a sixth aspect is any one of the first to fifth aspects, wherein the second damper has an elastic body integrated with an electric wire.

[0018] In this aspect, the second damper has an elastic body integrated with the wiring. This eliminates the need for space for wiring, which contributes to making the speaker thinner. [Brief description of the drawings]

[0019] [Figure 1] 1 is a cross-sectional view of a speaker according to a first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is a cut-away end view of the coupler. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 11 is a cross-sectional view of a speaker according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] (First embodiment) A speaker 10 according to a first embodiment of the present disclosure will be described with reference to Figures 1 to 7. Figure 1 is a cross-sectional view of the speaker 10 taken along an XZ plane passing through a central axis O1 of the speaker 10.

[0021] The speaker 10 is mounted, for example, in a vehicle door. The speaker 10 is, for example, a woofer or subwoofer, and is capable of reproducing low-frequency sounds with a large input. The main portion of the speaker 10 is symmetrical about a central axis O1.

[0022] The speaker 10 has a first vibrating part 20 that vibrates to produce sound, a second vibrating part 30 that vibrates to cancel out vibration of the entire speaker 10 caused by the first vibrating part 20, a magnetic circuit 40, and a frame 50 that supports these.

[0023] In the following description, the direction parallel to the central axis O1 is referred to as the axial direction, the direction from the second vibrating part 30 to the first vibrating part 20 in the axial direction is referred to as the forward direction or upward direction, and the direction from the first vibrating part 20 to the second vibrating part 30 is referred to as the rearward direction or downward direction. Also, the direction perpendicular to the central axis O1 is referred to as the radial direction.

[0024] (First vibration section 20) The first vibrating part 20 includes a first bobbin 21 , a first coil 22 , a first damper 27 , a diaphragm 24 , an edge 25 , a cap 26 , and a coupler 23 .

[0025] The first bobbin 21 has a cylindrical shape coaxial with the central axis O1. The first coil 22 is wound around the outer circumferential surface of the rear end portion of the first bobbin 21.

[0026] The diaphragm 24 is a member that radiates sound by vibrating. The diaphragm 24 has a circular hole at its center that is coaxial with the central axis O1, and has a shape that extends radially outward and forward from an inner edge portion 24a that defines the circular hole. An inner edge 24 a of the diaphragm 24 is joined to the coupler 23 . The outer edge 24b of the diaphragm 24 and the frame 50 are connected by an edge 25. An inner edge 25a of the edge 25 is joined to the front surface of the outer edge 24b of the diaphragm 24. The edge 25 is annular and has a U-shaped cross section that protrudes forward. An outer edge 27b of the edge 25 is joined to the frame 50.

[0027] The first damper 27 supports the first bobbin 21 so as to be vibrable in the direction of the central axis O1. The first damper 27 is disposed radially outward of the first bobbin 21 and rearward of the diaphragm 24. The first damper 27 is composed of a single elastic body 27A. The elastic body 27A has a circular hole at its center that is coaxial with the central axis O1, and is an annular disk-shaped elastic body that extends radially outward from an inner edge portion 27a that defines the circular hole, and has a wavy shape (specifically, a shape that undulates back and forth depending on the radial position). An inner edge 27a of the elastic body 27A is joined to the front surface of an outer edge (fourth horizontal portion 69, see FIG. 5) of the coupler 23, and an outer edge 27b of the elastic body 27A is joined to the frame 50.

[0028] As shown in Fig. 2, two strip-shaped wirings 81 (wiring, transmission paths) are integrated with the elastic body 27A. Each strip-shaped wiring 81 is provided on the front side of the elastic body 27A so as to follow the shape of the elastic body 27A. That is, each strip-shaped wiring 81 has a wave shape. The two strip-shaped wirings 81 are disposed at symmetrical positions in the Y direction, and extend parallel to each other along the X direction. An inner connection portion 82a of the strip-shaped wiring 82 is connected to a second extension portion 23c2 (see Fig. 4) of the relay member 23c described later.

[0029] The cap 26 is a member that radiates sound by vibrating. The cap 26 covers the first bobbin 21 and the coupler 23 from the front. The outer edge of the cap 26 is joined to the front surface of the diaphragm 24.

[0030] The coupler 23 is a member that radiates sound by vibrating. The coupler 23 is a member that is disposed on the outer circumferential side of the first bobbin 21, and connects the first bobbin 21 and the diaphragm 24, and also connects the first bobbin 21 and the first damper 27.

[0031] As shown in FIG. 4, the coupler 23 basically has an axially symmetrical configuration with respect to the central axis O1. 5, coupler 23 has, from the inner edge to the outer edge, a first horizontal portion 61, a first vertical wall portion 62, a first inclined portion 63, a second horizontal portion 64, a second vertical wall portion 65, a third horizontal portion 66, a second inclined portion 67, a third vertical wall portion 68, and a fourth horizontal portion 69. These components have an axisymmetric shape with respect to central axis O1, except for a portion where recess 23b described later is formed.

[0032] The first horizontal portion 61 is a portion that extends slightly radially inward from the rear end of the first vertical wall portion 62. The first horizontal portion 61 forms a circular hole that is coaxial with the central axis O1. When the first bobbin 21 is inserted into the circular hole, the outer circumferential surface of the first bobbin 21 is joined to the first horizontal portion 61 and the first vertical wall portion 62.

[0033] The first vertical wall portion 62 has a cylindrical shape. A small radial gap is formed between the inner peripheral surface of the first vertical wall portion 62 and the outer peripheral surface of the first bobbin 21. An adhesive is poured into this gap.

[0034] The first inclined portion 63 has a shape that is inclined forward toward the outside in the radial direction. The first inclined portion 63 makes it easier to pour the adhesive that bonds the first bobbin 21 and the coupler 23 together.

[0035] The second horizontal portion 64 is a portion that extends radially outward from the front end of the first inclined portion 63 .

[0036] The second vertical wall portion 65 has a cylindrical shape. An inner edge portion 24a of the diaphragm 24 is joined to the outer circumferential surface of the second vertical wall portion 65. The avoidance portion 23a is formed by the first inclined portion 63, the second horizontal portion 64, and the second vertical wall portion 65. The avoidance portion 23a is provided to prevent interference between the coupler 23 and the second bobbin 31 when the speaker 10 is in operation. In other words, the avoidance portion 23a is a portion of the first vibrating portion 20 that is shaped to escape to the front side to prevent interference with the second bobbin 31.

[0037] The third horizontal portion 66 is a portion that extends slightly radially outward from the rear end of the second vertical wall portion 65. The second inclined portion 67 has a shape that is inclined rearward toward the radially outward side. The third vertical wall portion 68 is a portion that extends slightly rearward from the rear end of the second inclined portion 67.

[0038] The fourth horizontal portion 69 is a portion that extends radially outward from the rear end of the third vertical wall portion 68. The fourth horizontal portion 69 constitutes the outer edge of the coupler 23. The elastic body 27A of the first damper 27 is joined to the front surface of the fourth horizontal portion 69 with an adhesive or the like.

[0039] 4, coupler 23 has two recesses 23b. The two recesses 23b are formed at positions symmetrical in the Y direction. In the portion where recesses 23b are formed, the front surface of coupler 23 is recessed toward the rear side or toward the radially inner side. Each recess 23b is formed in a region extending in the X direction when viewed from the +Z direction, which is the front side.

[0040] Specifically, the recess 23b has a first horizontal surface 23b1, a vertical surface 23b2, and a second horizontal surface 23b3. The first horizontal surface 23b1 is a surface formed by the front surface of the second horizontal portion 64 being recessed backward, and the normal direction of the first horizontal surface 23b1 faces forward. The vertical surface 23b2 is a surface formed by the second vertical wall portion 65, the third horizontal portion 66, the second inclined portion 67, and the third vertical wall portion 68 being recessed radially inward, and the normal direction of the vertical surface 23b2 faces radially outward. The second horizontal surface 23b3 is a surface formed by the third horizontal portion 66, the second inclined portion 67, and the third vertical wall portion 68 being recessed backward, and the normal direction of the vertical surface 23b3 faces forward. The second horizontal surface 23b3 is formed on the same plane as the front surface of the fourth horizontal portion 69.

[0041] The coupler 23 is formed by insert molding using two relay members 23c as insert parts. The two relay members 23c are conductive members and are disposed at positions corresponding to the two recesses 23b. The two relay members 23c have the same configuration. The relay member 23c is a member obtained by bending a long plate material. The relay member 23c has a first extending portion 23c1 extending in the axial direction and a second extending portion 23c2 extending in a direction perpendicular to the axial direction (X direction). The plate material constituting the relay member 23c is bent at a right angle at the rear end portion of the first extending portion 23c1, and the second extending portion 23c2 extends from that portion in the +X direction.

[0042] A part of the front end side of the first extending portion 23c1 protrudes forward from the first horizontal surface 23b1 of the recess 23b of the coupler 23, and a wiring (not shown) connected to the first coil 22 is connected to this part by soldering. In this way, since a part of the front end side of the first extending portion 23c1 protrudes forward from the first horizontal surface 23b1 of the recess 23b, it is possible to reduce the front-to-rear dimension of the first extending portion 23c1 while ensuring the front-to-rear dimension of the protruding part.

[0043] A portion of the front surface of the second extension portion 23c2 on the +X direction side is exposed at the front surface of the second horizontal surface 23b3 and the fourth horizontal portion 69 of the recess 23b of the coupler 23, and the inner connection portion 81a of the ribbon wiring 81 integrated with the elastic body 27A of the first damper 27 is joined to this portion by soldering.

[0044] (Second vibrating section 30) As shown in FIGS. 1 and 3, the second vibrating part 30 includes a second bobbin 31, a second coil 32, a second damper 37, a spacer 38, and a weight 39.

[0045] The second bobbin 31 has a cylindrical shape coaxial with the central axis O1. The second bobbin 31 has a larger diameter than the first bobbin . The second coil 32 is formed by being wound around the outer circumferential surface of the rear end portion of the second bobbin 31 . In the inoperative state (the state in which the speaker 10 is not in operation) shown in FIG. 1, the front end of the second bobbin 31 is located forward of the rear end of the first bobbin 21.

[0046] The second damper 37 supports the second bobbin 31 relative to the frame 50 so as to be capable of vibrating in the axial direction. The second damper 37 has a first elastic body 37A and a second elastic body 37B that are arranged with an axial gap between them. The first elastic body 37A and the second elastic body 37B are both disk-shaped elastic bodies that have a circular hole at the center that is coaxial with the central axis O1 and extend radially outward from the inner edge that defines the circular hole, and have a corrugated shape. The first elastic body 37A and the second elastic body 37B have approximately the same configuration. Therefore, the cross-sectional shapes of the first elastic body 37A and the second elastic body 37B overlap when they are translated in the axial direction. A spacer 38 for maintaining the axial distance between the first elastic body 37A and the second elastic body 37B is provided on the outer edge of the second damper 37. The rear surface of the outer edge of the second elastic body 37B is joined to the frame 50. The inner edge of the first elastic body 37A and the inner edge of the second elastic body 37B are joined to the outer circumferential surface of the second bobbin 31.

[0047] Two strip-shaped wirings 82 (wiring, transmission paths) are integrated with the first elastic body 37A. Each strip-shaped wiring 82 is provided on the front side of the first elastic body 37A so as to follow the shape of the first elastic body 37A. That is, each strip-shaped wiring 82 has a wave shape. The two strip-shaped wirings 82 are disposed at symmetrical positions in the Y direction and extend in parallel along the X direction. An inner connection portion 82a of the strip-shaped wiring 82 is connected to a transmission path formed on the outer circumferential surface of the second bobbin 31.

[0048] Weight 39 is provided to increase the mass of the part that is supported and vibrates by second damper 37. By increasing the mass of the part that is supported and vibrates by second damper 37, the amplitude of second vibrating section 30 can be reduced while maintaining the effect of canceling out the vibration of entire speaker 10 caused by second vibrating section 30. Weight 39 is annular and has a circular ring shape that follows the cylindrical shape of second bobbin 31. Weight 39 is provided near the inner edge of second damper 37. Specifically, weight 39 is disposed between first elastic body 37A and second elastic body 37B near the inner edge of second damper 37. Thus, weight 39 is disposed so as to surround second bobbin 31.

[0049] 6 is an enlarged perspective view of the weight 39. The weight 39 has two recesses 39a. The recesses 39a of the weight 39 increase the distance between the inner peripheral surface of the weight 39 and the outer peripheral surface of the second bobbin 31 in a portion of the circumferential direction in which the recesses 39a are formed. The two recesses 39a are formed at positions facing each other across the central axis O1. One of the two recesses 39a is formed in a range including a position where the inner connection portions 82a of the two strip-shaped wirings 82 described above are connected to the transmission path formed on the outer peripheral surface of the second bobbin 31.

[0050] Specifically, the weight 39 has a front surface 71, a rear surface 72, an outer peripheral surface 73, and an inner peripheral surface 74. The front surface 71 is a plane whose normal direction faces forward, and the rear surface 72 is a plane whose normal direction faces backward. The outer peripheral surface 73 is a curved surface whose normal direction faces radially outward, and is formed on one circumference centered on the central axis O1 when viewed from the axial direction. The inner peripheral surface 74 has a first inner peripheral surface 74a corresponding to a circumferential position where the recess 39a is not formed, and a second inner peripheral surface 74b corresponding to a circumferential position where the recess 39a is formed. Two first inner peripheral surfaces 74a are formed, and two second inner peripheral surfaces 74b are formed. Both the first inner peripheral surface 74a and the second inner peripheral surface 74b are curved surfaces whose normal direction faces radially inward, and are formed on an arc centered on the central axis O1 when viewed from the axial direction. Furthermore, the weight 39 has a connection surface 74c that connects the first inner circumferential surface 74a and the second inner circumferential surface 74b. Two connection surfaces 74c are formed for each second inner circumferential surface 74b. The two connection surfaces 74c face in directions (Y direction) that face each other. In other words, the two connection surfaces 74c are parallel to each other.

[0051] (Magnetic circuit 40) 1, the magnetic circuit 40 has a first magnetic member 41 (top plate), a first magnet 42, an intermediate magnetic member 43 (first yoke), a second magnet 44, and a second magnetic member 45 (second yoke). The magnetic circuit 40 is formed by stacking the second magnet 44, the intermediate magnetic member 43, the first magnet 42, and the first magnetic member 41 coaxially in this order from the second magnetic member 45 arranged at the rearmost. By configuring the magnetic circuits corresponding to the first vibrating part 20 and the second vibrating part 30 as a single magnetic circuit 40 and stacking the magnetic circuit 40 from the rear in this manner, assembly ease during the manufacturing process is improved.

[0052] The second magnetic member 45 has a disk-shaped bottom portion 45a, a cylindrical portion 45b standing forward from the outer edge of the bottom portion 45a, a columnar protrusion 45c protruding forward from the center of the bottom portion 45a, and a mounting flange 45d extending radially outward from the front end of the cylindrical portion 45b. The mounting flange 45d is attached to the frame 50. A recess 45a1 is provided on the rear surface of the bottom portion 45a.

[0053] The second magnet 44 is joined to the front surface of the protrusion 45c. The second magnet 44 has a cylindrical shape. The diameter of the second magnet 44 is larger than the diameter of the first magnet 42.

[0054] The intermediate magnetic member 43 is joined to the front surface of the second magnet 44. The intermediate magnetic member 43 has a disk-shaped bottom portion 43a, a cylindrical portion 43b standing forward from the periphery of the bottom portion 43a, and a columnar protrusion 43c protruding forward from the center of the bottom portion 43a.

[0055] The first magnet 42 is joined to the front surface of the protrusion 43c. The first magnet 42 has a cylindrical shape. The diameter of the first magnet 42 is approximately the same as the diameter of the protrusion 43c.

[0056] The first magnetic member 41 is joined to the front surface of the first magnet 42. The first magnetic member 41 has a cylindrical shape. The diameter of the first magnetic member 41 is slightly larger than the diameter of the first magnet 42.

[0057] The diameter of the bottom portion 43a of the intermediate magnetic member 43 is larger than the diameter of the cylindrical portion 43b. Therefore, the outer periphery 43a1 of the bottom portion 43a protrudes radially outward beyond the outer periphery of the cylindrical portion 43b. The outer periphery 43a1 of the bottom portion 43a is referred to as the outer protrusion 43a1. On the other hand, the front end of the cylindrical portion 45b of the second magnetic member 45 is substantially aligned with the front surface of the bottom portion 43a of the intermediate magnetic member 43 in the front-rear direction. Therefore, the outer protrusion 43a1 faces the front end of the cylindrical portion 43b of the second magnetic member 45 in the radial direction.

[0058] The front end of the cylindrical portion 43 b of the intermediate magnetic member 43 is located forward of the front surface of the first magnetic member 41 . An annular gap is formed between the inner circumferential surface of the cylindrical portion 43b of the intermediate magnetic member 43 and the outer circumferential surfaces of the first magnetic member 41, the first magnet 42, and the protruding portion 43c. In this gap, a first magnetic gap G1 is formed between the outer circumferential surface of the first magnetic member 41 and the inner circumferential surface of the cylindrical portion 43b, and a magnetic field that is approximately uniform in the circumferential direction is generated in the first magnetic gap G1.

[0059] The bottom 43a of the intermediate magnetic member 43, the second magnet 44, and the protruding portion 45c of the intermediate magnetic member 43 are located inside the cylindrical portion 45b of the intermediate magnetic member 43. An annular gap is formed between the inner peripheral surface of the cylindrical portion 45b and the outer peripheral surfaces of the bottom 43a, the second magnet 44, and the protruding portion 45c. In this gap, a magnetic field that is approximately uniform in the circumferential direction is generated in a second magnetic gap G2 formed by the outer peripheral surface of the bottom 43a (the outer peripheral surface of the outer protruding portion 43a1) and the inner peripheral surface of the cylindrical portion 45b. By adjusting the protruding amount of the outer protruding portion 43a1, the interval of the second magnetic gap G2 can be narrowed, and the magnetic flux passing through the second magnetic gap G2 can be increased, thereby reducing leakage magnetic flux.

[0060] (Frame 50) The frame 50 has a first support portion 51 that supports the outer edge portion 25b of the edge 25, a second support portion 52 that supports the outer edge portion 27b of the first damper 27, and a third support portion 53 that supports the outer edge portion of the second damper 37. As shown in Fig. 7, the first support portion 51, the second support portion 52, and the third support portion 53 are all formed continuously on a circumference centered on the central axis O1. The first support portion 51, the second support portion 52, and the third support portion 53 are joined to the edge 25, the first damper 27, and the second damper 37 on their respective forward-facing surfaces. The first support portion 51 is located at the front end, and the third support portion 53 is located at the rear end. The first support portion 51 has the largest diameter, and the third support portion 53 has the smallest diameter.

[0061] The frame 50 has a first connecting portion 55 that connects the first support portion 51 and the second support portion 52. As shown in Fig. 7, a plurality of first connecting portions 55 are provided separately in the circumferential direction. Therefore, a plurality of first openings 59A are formed between the first support portion 51 and the second support portion 52.

[0062] The frame 50 has a second connecting portion 56 that connects the second support portion 52 and the third support portion 53. As shown in Fig. 7, a plurality of second connecting portions 56 are provided separately in the circumferential direction. Therefore, a plurality of second openings 59B are formed between the second support portion 52 and the third support portion 53. The circumferential position at which the second connecting portion 56 is provided coincides with the first connecting portion 55.

[0063] The frame 50 has a fourth support portion 54 that supports the magnetic circuit 40. The plate thickness direction of the fourth support portion 54 is oriented in the axial direction. The frame 50 also has a third connecting portion 57 that connects the third support portion 53 and the fourth support portion 54. The third connecting portion 57 is formed continuously in the circumferential direction. Therefore, no opening is formed between the third support portion 53 and the fourth support portion 54.

[0064] Next, the relationship between the magnetic circuit 40 and the first vibrating part 20 and the second vibrating part 30 will be described.

[0065] A first coil 22 is disposed in the first magnetic gap G1. The first coil 22 is connected to a transmission path. Due to the action of an electric signal from the transmission path and the magnetic field of the first magnetic gap G1, the first bobbin 21 vibrates together with the first coil 22, and as a result, the first vibrating part 20 vibrates. This causes sound to be emitted. At this time, a first vibration force is generated in the speaker 10 in response to the vibration of the first vibrating part 20. This first vibration force causes the housing to which the speaker 10 is fixed to vibrate.

[0066] A second coil 32 is disposed in the second magnetic gap G2. The second coil 32 is connected to the same transmission path as the first coil 22, and the second bobbin 31 vibrates together with the second coil 32 due to the action of an electric signal from the transmission path and the magnetic field of the second magnetic gap, causing the second vibrating part 30 to vibrate. The first vibrating part 20 and the second vibrating part 30 are configured to operate in opposite phases to each other. Specifically, when the first vibrating part 20 is displaced forward, the second vibrating part 30 is displaced backward, and when the first vibrating part 20 is displaced backward, the second vibrating part 30 is displaced forward. The first vibrating part 20 and the second vibrating part 30 can be made to operate in opposite phases to each other by adjusting the magnetization direction of each magnet, the direction of current flow, and the winding direction of the coil.

[0067] <Action and effect> Next, the effects of this embodiment will be described.

[0068] 1, in this embodiment, the speaker 10 includes a frame 50, a magnetic circuit 40, and a first vibrating part 20 that vibrates to produce sound. The first vibrating part 20 has a first bobbin 21, a first coil 22, a first damper 27, and a diaphragm 24. The first coil 22 and the first bobbin 21 are elastically supported by the first damper 27 relative to the frame 50, and the first coil 22 is driven in cooperation with the magnetic circuit 40, causing the diaphragm 24 to vibrate and produce sound.

[0069] Moreover, in this embodiment, the speaker 10 further includes a second vibrating part 30 that vibrates to cancel out the vibration of the entire speaker 10 caused by the first vibrating part 20. The second vibrating part 30 has a second bobbin 31, a second coil 32, and a second damper 37. Therefore, the vibration of the first vibrating part 20 transmitted to the frame 50 is canceled out. Then, the generation of unnecessary vibration transmitted to the frame 50 can be suppressed, and the vibration of the speaker 10 is suppressed. As a result, deterioration of sound quality caused by the vibration of the speaker 10 is suppressed.

[0070] Incidentally, in the conventional technology in which the inner edge 24a of the diaphragm 24 is directly joined to the first bobbin 21, a large inclination may be provided near the inner edge of the diaphragm 24 in order to ensure an appropriate rigidity of the diaphragm 24 and suppress reverse vibration. However, providing a large inclination near the inner edge of the diaphragm 24 increases the height dimension (total height, front-to-back dimension) of the diaphragm 24, which is disadvantageous in making the speaker 10 thinner. Therefore, in this embodiment, the first vibrating part 20 has a coupler 23. The inner edge part 24a of the diaphragm 24 is disposed radially outwardly spaced from the outer circumferential surface of the first bobbin 21, and the inner edge part 24a of the diaphragm 24 and the first bobbin 21 are connected by the coupler 23. That is, the vicinity of the inner edge of the diaphragm in the above-mentioned conventional technology is replaced with the coupler 23. Therefore, it is easy to ensure the rigidity of the member including the coupler 23 and the diaphragm 24 without increasing the height dimension of the diaphragm 24. As a result, the speaker 10 can be made thinner while suppressing the reverse vibration of the diaphragm 24.

[0071] In this embodiment, the coupler 23 includes an avoidance portion 23a that avoids interference with the second bobbin 31. Therefore, the first vibrating portion 20 and the second vibrating portion 30 can be disposed closer to each other than in a case where the coupler 23 does not include the avoidance portion 23a. As a result, the speaker 10 can be made thinner. In particular, in this embodiment, although not shown, when the first bobbin 21 and the second bobbin 31 are closest to each other in the front-rear direction, the front end of the second bobbin 31 is located within the avoidance portion 23a.

[0072] In addition, in this embodiment, the inner edge portion 27a of the first damper 27 is positioned radially outwardly spaced from the outer peripheral surface of the first bobbin 21, and the inner edge portion 27a of the first damper 27 and the first bobbin 21 are connected by a coupler 23. In other words, the connection between the diaphragm 24 and the first bobbin 21 and the connection between the first damper 27 and the first bobbin 21 are realized by the coupler 23 . Therefore, speaker 10 can be made thinner compared to a configuration in which the connection between diaphragm 24 and first bobbin 21 and the connection between first damper 27 and first bobbin 21 are realized separately at different positions in the front-to-rear direction.

[0073] In this embodiment, the inner edge 24a of the diaphragm 24 is located radially inward of the inner edge 27a of the first damper 27. Therefore, the first vibrating part 20 including the coupler 23, the diaphragm 24, and the first damper 27 can be easily assembled.

[0074] In this embodiment, the coupler 23 has a recess 23b corresponding to the position where the transmission path is arranged, as shown in Fig. 4. This makes it easy to arrange the transmission path.

[0075] 4, the coupler 23 is molded with a conductive relay member 23c as an insert. Therefore, the relay member 23c inserted into the coupler 23 can relay the transmission path connected to the first coil 22 and the transmission path connected to the outside of the speaker 10.

[0076] 1, the first vibrating part 20 has an edge 25 that elastically supports the outer edge part 24b of the vibration plate 24. The outer edge part 27b of the first damper 27 is located radially outward of the outer edge part 24b of the vibration plate 24. Therefore, the first damper 27 is located behind the outer edge 24b of the diaphragm 24, and interference between the outer edge 24b of the diaphragm 24 and other members can be suppressed. Therefore, the distance in the front-to-rear direction between the diaphragm 24 and the first damper 27 can be set small, and the speaker 10 can be made thinner.

[0077] Incidentally, since the first damper 27 and the second damper 37 are displaced in opposite directions, the volume of the space between the first damper 27 and the second damper 37 inside the speaker 10 varies greatly. Therefore, in this embodiment, the frame 50 has a second opening 59B (see FIG. 7) that connects the space between the first damper 27 and the second damper 37 inside the speaker 10 to the space outside the speaker 10. This allows air to escape from the space between the first damper 27 and the second damper 37 inside the speaker 10.

[0078] 1, the coupler 23 has a vertical wall portion 65 against which the inner edge portion 24a of the diaphragm 24 abuts. Therefore, the vertical wall portion 65 of the coupler 23 serves as a guide, and the diaphragm 24 can be disposed at a desired position relative to the coupler 23.

[0079] In this embodiment, the magnetic circuit 40 includes a first magnet 42, a second magnet 44, a first magnetic member 41 attached to the first magnet 42, a second magnetic member 45 attached to the second magnet 44, and an intermediate magnetic member 43 attached to both the first magnet 42 and the second magnet 44. The intermediate magnetic member 43 forms a first magnetic gap G1 between itself and the first magnetic member 41, and also forms a second magnetic gap G2 between itself and the second magnetic member 45. Therefore, the intermediate magnetic member 43 can be used as a path for both the magnetic flux passing through the first magnetic gap G1 and the magnetic flux passing through the second magnetic gap G2, and the magnetic circuit 40 can be made thinner.

[0080] Moreover, in this embodiment, the second vibrating section 30 has the weight 39. Therefore, compared to a mode in which the second vibrating section 30 does not have the weight 39, it is possible to reduce the amplitude of the second vibrating section 30 while maintaining the effect of canceling out the vibration of the entire speaker 10. As a result, it is possible to make the speaker 10 thinner.

[0081] In this embodiment, the second bobbin 31 protrudes forward (upward) from the weight 39. In other words, the weight 39 does not protrude forward from the second bobbin 31. For this reason, it is easier to make the speaker 10 thinner than in a case where, for example, the weight 39 is disposed so as to be hooked onto the front end of the second bobbin 31.

[0082] In this embodiment, the second damper 37 has two elastic bodies 37A and 37B. This improves the symmetry and linearity of movement of the second vibrating part 30 during vibration. The weight 39 is disposed between the two elastic bodies 37A and 37B. This does not adversely affect the thinning of the speaker 10.

[0083] 6, in this embodiment, the weight 39 has a recess 39a that expands the distance from the second bobbin 31 in a part of the circumferential direction. Therefore, when soldering or the like is performed on the outer circumferential surface of the second bobbin 31, by providing the recess 39a corresponding to the portion where the soldering is performed, it is possible to prevent a short circuit between the second bobbin 31 and the weight 39 due to solder residue, other metal parts, or the like.

[0084] 3, the second damper 37 has a first elastic body 37A that is integrated with the transmission path (strip wiring 82). Therefore, there is no need to provide a space for arranging the transmission path, which contributes to making the speaker 10 thinner.

[0085] Second embodiment FIG. 8 shows a speaker 110 according to the second embodiment.

[0086] In the second embodiment, the configuration of the second vibrating part 130 is different from that of the second vibrating part 30 of the first embodiment. The second vibrating section 130 has a second damper 137. The second damper 137 has a first elastic body 137A and a second elastic body 37B arranged to overlap in the vibration direction. The first elastic body 37A has a recessed portion 37A1 recessed in a direction approaching the second elastic body 37B in the vibration direction, and the weight 139 is arranged on the surface of the recessed portion 37A1 opposite to the second elastic body 37B. Therefore, there is no need to perform an operation to arrange the weight 39 between the first elastic body 137A and the second elastic body 37B, and the dimensional expansion in the amplitude direction of the second vibrating section 30 can be suppressed.

[0087] 〔supplementary explanation〕 Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment.

[0088] The material of each part of the first vibrating part 20 and the second vibrating part 30, 130 is not particularly limited. For example, the diaphragm 24, the first damper 27, the elastic bodies 37A, 37B, and the cap 26 can be made of various materials such as paper, resin, metal, or a composite material or ceramic material that combines these materials. The edge 25 can be made of a relatively highly elastic polymer material such as rubber or resin. In addition, a fiber material may be used as the material of each part of the first vibrating part 20 and the second vibrating part 30, 130. Furthermore, the base material of each part of the first vibrating part 20 and the second vibrating part 30, 130 may be coated with a rubber coat or the like. The frame 50 and the spacer 38 can be made of a resin or paper material, a metal non-magnetic material, or the like.

[0089] The diameters and thicknesses of each member shown in each drawing are merely examples, and the shapes and dimensions are not limited to these.

[0090] In the above embodiment, an example in which the coupler 23 is joined to one elastic body (elastic body 27A) has been described, but the present disclosure is not limited to this. The coupler may be joined to two or more elastic bodies. In the above embodiment, the example in which the diaphragm 24 and the first damper 27 are joined to the coupler 23 has been described, but other components (for example, a cap) may also be joined to the coupler.

[0091] In the above embodiment, an example has been described in which the recess 23b is formed at a position corresponding to the entire transmission path provided in the coupler 23, but the recess of the present disclosure is not limited to this. The recess may be formed at least in a part of the position where the transmission path is provided. Furthermore, when a relay component is provided in the coupler, the coupler does not need to have a recess.

[0092] In the above embodiment, the coupler 23 is molded using the conductive relay component 23c as an insert component, but the relay component of the present disclosure is not limited to this. The relay component may be held in the coupler by a method other than insert molding.

[0093] Furthermore, the configuration of the weight 39 is not limited to that in the above embodiment. For example, the weight may be attached to the inner circumferential surface side of the bobbin. Also, the weight may be attached to the front end of the bobbin. Also, the shape of the weight is not limited to annular, and may be, for example, polygonal. Also, the weight may not have a recess. Also, the weight may be in contact with the voice coil in an insulated state.

[0094] Furthermore, the configuration of the second damper 37 is not limited to the above embodiment. For example, the second damper may have one elastic body or three or more elastic bodies. Also, two elastic bodies may be attached to the frame by providing a step in the frame without providing the spacer 38.

[0095] The disclosure of Japanese Patent Application No. 2023-004734, filed on January 16, 2023, is incorporated herein by reference in its entirety. [Explanation of symbols]

[0096] 10 Speaker 20 First vibration section 21 First Bobbin 22 First coil 23 Coupler 23a Avoidance part 23b Recess 23c Intermediate parts 24 Diaphragm 24a Inner edge 24b Outer edge 25 Edge 27 First damper 27a Inner edge 27b Outer edge 30 Second vibration section 31 Second Bobbin 32 Second coil 37 Second damper 37A First Elastic Body 37B Second elastic body 39 Weight 39a Recess 40 Magnetic Circuit 50 frames 59B Second opening (opening) 65 Second vertical wall section (vertical wall section) 82 Band Wiring (Wiring) 110 Speaker 130 Second vibration section 137 Second damper 137A First Elastic Body 139 Weight G1 First magnetic gap G2 Second magnetic gap O1 center axis

Claims

1. A magnetic circuit; a first vibration portion having a first bobbin, a first coil, and a first damper; a second vibration portion including a second bobbin, a second coil, a second damper, and a weight; A speaker comprising: The magnetic circuit includes: A first magnet; a first magnetic member attached to the first magnet; a first yoke attached to the first magnet and forming a first magnetic gap between the first yoke and the first magnetic member; a second yoke forming a second magnetic gap between the first yoke and the second yoke; having The weight is disposed so as to surround the second bobbin, The weight has a recess in a circumferential portion thereof for increasing a distance between the weight and the second bobbin. Speaker.

2. The second bobbin protrudes upward relative to the spindle.

2. A speaker according to claim 1.

3. The second damper has two elastic bodies, The weight is disposed between the two elastic bodies.

2. A speaker according to claim 1.

4. The second damper has a first elastic body and a second elastic body arranged to overlap in a vibration direction, the first elastic body has a recessed portion recessed in a direction approaching the second elastic body in the vibration direction, The weight is disposed on a surface of the recess opposite to the second elastic body.

2. A speaker according to claim 1.

5. The weight is attached to the second damper and is not in contact with the second bobbin.

2. A speaker according to claim 1.

6. The second damper has an elastic body integrated with a wiring.

2. A speaker according to claim 1.

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