Loudspeaker

Abstract

Provided is a speaker having a structure suitable for thinning. A speaker (10) is provided with a magnetic circuit (40), a first vibration unit (20), and a second vibration unit (30). The magnetic circuit (40) has a first magnet (42), a first magnetic member (41) attached to the first magnet (42), and a first yoke (43) and a second yoke (45) attached to the first magnet (42). 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). In addition, the second vibration part (30) is provided with a counterweight (39).

Description

Technical Field

[0001] The present invention relates to loudspeakers. Background Art

[0002] Patent Document 1 discloses a speaker device for achieving high-quality sound reproduction. This speaker device includes a first magnetic circuit, a main body that radiates sound waves, a second magnetic circuit integrally formed with the first magnetic circuit, and a vibration suppression unit. The main body includes a first vibrating unit driven by the first magnetic circuit, while the vibration suppression unit includes a second vibrating unit driven by the second magnetic circuit in a direction opposite to the first vibrating unit. The second vibrating unit applies vibrations to the second magnetic circuit that cancel out the vibrations applied to the first magnetic circuit by the first vibrating unit. Prior art literature Patent Literature

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-13587 Summary of the Invention Problems to be solved by the invention

[0004] The above-mentioned technology still has room for improvement in terms of thinning the speaker. An object of the present disclosure is to provide a speaker having a structure suitable for thinning. Means of solving problems

[0005] According to the first embodiment, a loudspeaker is provided with a magnetic circuit, a first vibrating portion having a first voice coil frame, a first coil and a first damper, and a second vibrating portion having a second voice coil frame, a second coil, a second damper and a counterweight, wherein the magnetic circuit has a first magnet, a first magnetic component mounted on the first magnet, a first yoke mounted on the first magnet and forming a first magnetic gap with the first magnetic component, and a second yoke forming a second magnetic gap with the first yoke.

[0006] In this aspect, the speaker includes a magnetic circuit, a first vibrating part, and a second vibrating part. The first vibrating part includes a first voice coil bobbin, a first coil, and a first damper, and the second vibrating part includes a second voice coil 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 with the first magnetic member and a second magnetic gap with the second yoke. Therefore, the first yoke can serve as a path for both the magnetic flux passing through the first magnetic gap and the magnetic flux passing through the second magnetic gap, and the magnetic circuit can be made thinner.

[0008] Here, the second vibration part has a weight. Therefore, compared to a case where the second vibrating part does not have a counterweight, the amplitude of the second vibrating part can be reduced while maintaining the force generated by the second vibrating part. As a result, the speaker can be made thinner. It should be noted that thinning the speaker refers to miniaturizing the speaker in the vibration direction (amplitude direction) of the first vibrating part, that is, reducing the overall height of the speaker. In the following embodiments, an example will be described in which the second vibrating portion vibrates to offset the overall speaker vibration caused by the first vibrating portion. However, the first and second vibrating portions of this aspect are not limited to this. The second vibrating portion may vibrate synchronously with the first vibrating portion in the same direction, or may vibrate in other vibration modes for other functions.

[0009] According to the speaker of the second aspect, in the first aspect, the second voice coil bobbin protrudes upward relative to the weight.

[0010] In this embodiment, the second voice coil bobbin protrudes upward relative to the weight. In other words, the weight does not protrude toward the first vibrating portion above the second voice coil bobbin. Therefore, compared with, for example, a configuration in which a weight is hung on the upper end of the second voice coil bobbin, it is easier to reduce the thickness of the speaker.

[0011] According to the speaker of the third aspect, in the first or second aspect, the second damper includes two elastic bodies, and the weight is arranged between the two elastic bodies.

[0012] In this aspect, the second damper includes two elastic bodies, so that the movement symmetry and linearity of the second vibrating part at the vibration amplitude are improved. Furthermore, the weight is placed between the two elastic bodies, so it does not adversely affect the thinness of the speaker.

[0013] According to the speaker of the fourth embodiment, in any embodiment of the first to third aspects, the second damper has a first elastomer and a second elastomer arranged overlapping in the vibration direction, the first elastomer has a recessed portion recessed in the direction close to the second elastomer in the vibration direction, and the counterweight is arranged on the surface of the recessed portion on the opposite side of the second elastomer.

[0014] In this embodiment, the second damper includes a first elastic body and a second elastic body arranged overlapping in the vibration direction. The first elastic body has a recessed portion that is recessed in the vibration direction toward the second elastic body, and the counterweight is arranged on a surface of the recessed portion opposite to the second elastic body. Therefore, it is unnecessary to arrange a weight between the first elastic body and the second elastic body, and it is possible to suppress an increase in the size of the second vibrating portion in the amplitude direction.

[0015] According to a fifth aspect of the speaker, in any of the first to fourth aspects, the counterweight is annular and surrounds the second voice coil bobbin. The counterweight is radially spaced apart from the second voice coil bobbin. The counterweight has a recessed portion in a circumferential portion that increases the distance between the counterweight and the second voice coil bobbin.

[0016] In this aspect, the weight has a recessed portion in a portion in the circumferential direction for increasing the distance between the weight and the second voice coil bobbin. Therefore, when welding the outer peripheral surface of the second voice coil bobbin, providing the recessed portion at a position corresponding to the welded portion can suppress short circuits between the second voice coil bobbin and the weight caused by welding slag or other metal components.

[0017] According to the speaker of the sixth aspect, in any one of the first to fifth aspects, the second damper includes an elastic body integrated with the electric wire.

[0018] In this aspect, the second damper includes an elastic body integrated with the wiring. Therefore, there is no need to provide a space for wiring, which contributes to the reduction in thickness of the speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the loudspeaker according to the first embodiment. Figure 2 This is an exploded perspective view of the first vibrating part. Figure 3 This is an exploded perspective view of the second vibrating part. Figure 4 is a perspective view of the coupler. Figure 5 This is a cut-off end view of the coupler. Figure 6 It is a three-dimensional diagram of the counterweight. Figure 7 This is a partial enlarged view of the frame. Figure 8 It is a cross-sectional view of a loudspeaker according to a second embodiment. DETAILED DESCRIPTION

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

[0021] The speaker 10 is mounted on a door of a vehicle, for example. The speaker 10 is, for example, a woofer or a subwoofer, capable of playing bass sounds with a large input. The main portion of the speaker 10 is axially symmetrical with respect to a central axis O1.

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

[0023] In the following description, directions parallel to the central axis O1 are referred to as axial directions. Within the axial directions, the direction from the second vibrating portion 30 toward the first vibrating portion 20 is referred to as the front direction or the upward direction, and the direction from the first vibrating portion 20 toward the second vibrating portion 30 is referred to as the rear direction or the downward direction. Furthermore, directions perpendicular to the central axis O1 are referred to as radial directions.

[0024] (First Vibrating Unit 20 ) The first vibrating part 20 includes a first voice coil bobbin 21 , a first coil 22 , a first damper 27 , a diaphragm 24 , a rim 25 , a cap 26 , and a coupler 23 .

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

[0026] The diaphragm 24 is a member that radiates sound by vibrating. The diaphragm 24 has a circular hole in the 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 forming the circular hole. An inner edge portion 24 a of the vibration plate 24 is joined to the coupler 23 . The outer edge 24b of the vibration plate 24 is connected to the frame 50 via the edge 25. The inner edge 25a of the edge 25 is joined to the front of the outer edge 24b of the vibration plate 24. The edge 25 is annular and has a U-shaped cross section that protrudes forward. The outer edge 27b of the edge 25 is joined to the frame 50.

[0027] The first damper 27 supports the first voice coil bobbin 21 so as to be vibrable in the direction of the central axis O1. The first damper 27 is arranged radially outward of the first voice coil bobbin 21 and behind the diaphragm 24. The first damper 27 is composed of a single elastic member 27A. The elastic member 27A is an annular disk-shaped elastic member having a central circular hole coaxial with the central axis O1. The elastic member extends radially outward from the inner edge 27a forming the circular hole. The elastic member has a corrugated shape (specifically, a shape that fluctuates back and forth according to radial position). The inner edge portion 27a of the elastic body 27A is joined to the outer edge portion of the coupler 23 (the fourth horizontal portion 69, see Figure 5 ), the outer edge portion 27b of the elastic body 27A is joined to the frame 50.

[0028] like Figure 2 As shown, two strip-shaped wirings 81 (wiring, transmission path) are integrated into the elastic body 27A. Each strip-shaped wiring 81 is provided on the front side of the elastic body 27A along the shape of the elastic body 27A. In other words, each strip-shaped wiring 81 has a wavy shape. The two strip-shaped wirings 81 are arranged at positions symmetrical in the Y direction and extend parallel to each other in the X direction. The inner connecting portion 82a of the strip-shaped wiring 82 is connected to the second extending portion 23c2 of the relay member 23c described later (see FIG. Figure 4 )connect.

[0029] The cap 26 is a member that radiates sound by vibrating. The cap 26 covers the first voice coil 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 disposed on the outer periphery of the first voice coil bobbin 21 , and connects the first voice coil bobbin 21 and the diaphragm 24 , and also connects the first voice coil bobbin 21 and the first damper 27 .

[0031] like Figure 4 As shown, the coupler 23 basically has an axisymmetrical structure with respect to the central axis O1. like Figure 5 As shown, the 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 axisymmetrical shape with respect to the central axis O1, except for the portion where the recessed portion 23b described later is formed.

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

[0033] The first vertical wall portion 62 is cylindrical in 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 voice coil bobbin 21. Adhesive flows into this gap.

[0034] The first inclined portion 63 has a shape that is inclined radially outward and forward, and facilitates the operation of pouring the adhesive for bonding the first voice coil bobbin 21 and the coupler 23 .

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

[0036] The second vertical wall portion 65 has a cylindrical shape, and the inner edge portion 24 a of the vibration plate 24 is joined to the outer peripheral surface of the second vertical wall portion 65 . The first inclined portion 63, the second horizontal portion 64, and the second vertical wall portion 65 form a relief portion 23a. The relief portion 23a is provided to prevent interference between the coupler 23 and the second voice coil bobbin 31 during operation of the loudspeaker 10. Specifically, the relief portion 23a is a portion of the first vibrating portion 20 that is recessed forward to prevent interference with the second voice coil bobbin 31.

[0037] The third horizontal portion 66 slightly extends radially outward from the rear end of the second vertical wall portion 65. The second inclined portion 67 is shaped to be inclined radially outward toward the rear. The third vertical wall portion 68 slightly extends rearward from the rear end of the second inclined portion 67.

[0038] The fourth horizontal portion 69 is a portion extending 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 bonded to the front surface of the fourth horizontal portion 69 with adhesive or the like.

[0039] like Figure 4 As shown, coupler 23 has two recesses 23b. These two recesses 23b are formed symmetrically in the Y direction. The front surface of coupler 23 is recessed toward the rear, or radially inward, in the portion where recesses 23b are formed. Each recess 23b is formed in a region extending in the X direction when viewed from the front (+Z direction).

[0040] Specifically, the recessed portion 23b has a first horizontal surface 23b1, a longitudinal surface 23b2, and a second horizontal surface 23b3. The first horizontal surface 23b1 is formed by the front surface of the second horizontal portion 64 being recessed rearward, with its normal facing forward. The longitudinal surface 23b2 is formed by the radially inward recesses of the second longitudinal wall portion 65, the third horizontal portion 66, the second inclined portion 67, and the third longitudinal wall portion 68, with its normal facing radially outward. The second horizontal surface 23b3 is formed by the rearward recesses of the third horizontal portion 66, the second inclined portion 67, and the third longitudinal wall portion 68, with its normal facing forward. The second horizontal surface 23b3 is flush with the front surface of the fourth horizontal portion 69.

[0041] The coupler 23 is formed by insert molding using two relay members 23c as inserts. The two relay members 23c are conductive components and are arranged at positions corresponding to the two recessed portions 23b. The two relay members 23c have the same structure. The relay member 23c is formed by bending a long, strip-shaped plate. It has a first extension portion 23c1 extending in the axial direction and a second extension portion 23c2 extending perpendicularly to the axial direction (the X direction). The plate forming the relay member 23c is bent at a right angle at the rear end of the first extension portion 23c1, and the second extension portion 23c2 extends from this portion in the +X direction.

[0042] A portion of the front end of the first extension portion 23c1 protrudes forward from the first horizontal surface 23b1 of the recessed portion 23b of the coupler 23. A wiring (not shown) connected to the first coil 22 is connected to this portion by welding or the like. Thus, since a portion of the front end of the first extension portion 23c1 protrudes forward from the first horizontal surface 23b1 of the recessed portion 23b, the front-to-back dimension of the first extension portion 23c1 can be reduced while maintaining the front-to-back dimension of the protruding portion.

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

[0044] (Second Vibrating Unit 30 ) like Figure 1 、 Figure 3 As shown, the second vibrating part 30 includes a second voice coil bobbin 31 , a second coil 32 , a second damper 37 , a spacer 38 , and a weight 39 .

[0045] The second voice coil bobbin 31 has a cylindrical shape coaxial with the central axis O1 and has a larger diameter than the first voice coil bobbin 21 . The second coil 32 is wound around the outer peripheral surface of the rear end portion of the second voice coil bobbin 31 . exist Figure 1 In the non-operating state shown (a state in which the loudspeaker 10 is not operating), the front end of the second voice coil bobbin 31 is located further forward than the rear end of the first voice coil bobbin 21 .

[0046] The second damper 37 supports the second voice coil bobbin 31 in a vibration-capable manner in the axial direction relative to the frame 50 . The second damper 37 includes a first elastic body 37A and a second elastic body 37B, spaced apart in the axial direction. Each of the first and second elastic bodies 37A and 37B has a central circular hole coaxial with the central axis O1. The first and second elastic bodies 37A and 37B are circular plate-shaped elastic bodies that extend radially outward from the inner edge of the circular hole, forming a corrugated shape. The first and second elastic bodies 37A and 37B have substantially the same structure. Therefore, when the first and second elastic bodies 37A and 37B move parallel to each other in the axial direction, their cross-sectional shapes overlap. A spacer 38 is provided on the outer edge of the second damper 37 to maintain the axial distance between the first elastic body 37A and the second elastic body 37B. The rear surface of the outer edge of the second elastic body 37B is bonded to the frame 50. The inner edges of the first elastic body 37A and the second elastic body 37B are bonded to the outer circumferential surface of the second voice coil bobbin 31.

[0047] Two ribbon wirings 82 (wiring, transmission path) are integrated with the first elastic body 37A. Each ribbon wiring 82 is provided on the front side of the first elastic body 37A along the shape of the first elastic body 37A. In other words, each ribbon wiring 82 has a corrugated shape. The two strip wirings 82 are arranged at positions symmetrical with respect to the Y direction and extend parallel to the X direction. The inner connecting portion 82 a of the strip wiring 82 is connected to a transmission path formed on the outer peripheral surface of the second voice coil bobbin 31 .

[0048] The counterweight 39 is provided to increase the mass of the portion that is supported and vibrates by the second damper 37. By increasing the mass of the portion that is supported and vibrates by the second damper 37, the amplitude of the second vibrating portion 30 can be reduced while maintaining the effect of the second vibrating portion 30 offsetting the overall vibration of the speaker 10. The counterweight 39 is annular, forming a circular ring that follows the cylindrical shape of the second voice coil bobbin 31. The counterweight 39 is positioned near the inner edge of the second damper 37. Specifically, it is positioned between the first elastic body 37A and the second elastic body 37B near the inner edge of the second damper 37. Thus, the counterweight 39 is positioned to surround the second voice coil bobbin 31.

[0049] Figure 6 This is an enlarged perspective view of the counterweight 39. The counterweight 39 has two recesses 39a. The recesses 39a increase the distance between the inner circumference of the counterweight 39 and the outer circumference of the second voice coil bobbin 31 in the circumferential portion where the recesses 39a are formed. The two recesses 39a are formed at positions opposing each other about the central axis O1. One of the two recesses 39a is formed within a range that includes the location where the inner connecting portion 82a of the two ribbon wirings 82 connects to the transmission path formed on the outer circumference of the second voice coil bobbin 31.

[0050] Specifically, the counterweight 39 has a front face 71, a rear face 72, an outer peripheral surface 73, and an inner peripheral surface 74. The front face 71 is a plane with its normal direction facing forward, and the rear face 72 is a plane with its normal direction facing backward. The outer peripheral surface 73 is a curved surface with its normal direction facing radially outward, and is formed on a 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. The first inner peripheral surface 74a and the second inner peripheral surface 74b are both curved surfaces with their normal direction facing radially inward, and are formed on an arc centered on the central axis O1 when viewed from the axial direction. Furthermore, the counterweight 39 has a connecting surface 74c connecting the first inner circumferential surface 74a and the second inner circumferential surface 74b. Two connecting surfaces 74c are formed for each second inner circumferential surface 74b. The two connecting surfaces 74c face opposite directions (the Y direction). In other words, the two connecting surfaces 74c are parallel to each other.

[0051] (Magnetic circuit 40) like Figure 1 As shown, magnetic circuit 40 includes 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). Starting with second magnetic member 45, which is positioned at the rear, magnetic circuit 40 is coaxially stacked in this order: second magnet 44, intermediate magnetic member 43, first magnet 42, and first magnetic member 41. By configuring the magnetic circuits corresponding to the first vibrating portion 20 and the second vibrating portion 30 with a single magnetic circuit 40 and adopting a structure in which the magnetic circuits 40 are stacked from the rear, it is possible to improve assemblability in the manufacturing process.

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

[0053] The second magnet 44 is joined to the front surface of the protrusion 45 c. The second magnet 44 is cylindrical in shape and has a diameter larger than that 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 disc-shaped bottom 43a, a cylindrical portion 43b standing forward from the periphery of the bottom 43a, and a cylindrical protrusion 43c protruding forward from the center of the bottom 43a.

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

[0056] The first magnetic member 41 is attached to the front surface of the first magnet 42. The first magnetic member 41 is cylindrical in shape. The diameter of the first magnetic member 41 is slightly larger than that of the first magnet 42.

[0057] The diameter of the bottom portion 43a of the intermediate magnetic member 43 is larger than that of the cylindrical portion 43b. Therefore, the outer peripheral portion 43a1 of the bottom portion 43a protrudes radially outward from the outer peripheral surface of the cylindrical portion 43b. The outer peripheral portion 43a1 of the bottom portion 43a is referred to as the outer protruding portion 43a1. On the other hand, the front end of the cylindrical portion 45 b of the second magnetic member 45 and the front surface of the bottom portion 43 a of the intermediate magnetic member 43 are positioned approximately in the front-rear direction. Therefore, the outer protruding portion 43 a 1 is radially opposed to the front end portion of the cylindrical portion 43 b of the second magnetic member 45 .

[0058] The front end of the cylindrical portion 43 b of the intermediate magnetic member 43 is located further forward than the front face of the first magnetic member 41 . An annular gap is formed between the inner circumference of the cylindrical portion 43b of the intermediate magnetic member 43 and the outer circumference of the first magnetic member 41, the first magnet 42, and the protrusion 43c. Within this gap, a substantially uniform circumferential magnetic field is generated in a first magnetic gap G1 formed between the outer circumference of the first magnetic member 41 and the inner circumference of the cylindrical portion 43b.

[0059] The bottom 43a of the intermediate magnetic member 43, the second magnet 44, and the protrusion 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 circumference of the cylindrical portion 45b and the outer circumference of the bottom 43a, the second magnet 44, and the protrusion 45c. Within this gap, a substantially uniform circumferential magnetic field is generated in a second magnetic gap G2 formed between the outer circumference of the bottom 43a (the outer circumference of the outer protrusion 43a1) and the inner circumference of the cylindrical portion 45b. By adjusting the protrusion amount of the outer protrusion 43a1, the interval of the second magnetic gap G2 can be reduced, the magnetic flux passing through the second magnetic gap G2 can be increased, and the leakage magnetic flux can be reduced.

[0060] (Frame 50) The frame 50 includes a first support portion 51 that supports the outer edge portion 25 b of the rim 25 , a second support portion 52 that supports the outer edge portion 27 b of the first damper 27 , and a third support portion 53 that supports the outer edge portion of the second damper 37 . like Figure 7As shown, the first support portion 51, the second support portion 52, and the third support portion 53 are all formed continuously along a circumference centered on the central axis O1. The first support portion 51, the second support portion 52, and the third support portion 53 engage with 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, and the third support portion 53 is located at the rear. The first support portion 51 has the largest diameter, while the third support portion 53 has the smallest diameter.

[0061] The frame 50 has a first connecting portion 55 connecting the first supporting portion 51 and the second supporting portion 52. Figure 7 As shown in FIG. 5 , a plurality of first connection portions 55 are provided in a circumferentially spaced relationship. 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 connecting the second supporting portion 52 and the third supporting portion 53. Figure 7 As shown, a plurality of second connection portions 56 are provided circumferentially. Therefore, a plurality of second openings 59B are formed between the second support portion 52 and the third support portion 53. The circumferential positions of the second connection portions 56 are aligned with those of the first connection portions 55.

[0063] The frame 50 includes a fourth support portion 54 that supports the magnetic circuit 40. The thickness of the fourth support portion 54 is axially oriented. Furthermore, the frame 50 includes 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, there is no opening between the third support portion 53 and the fourth support portion 54.

[0064] Next, the relationship between the magnetic circuit 40 , the first vibrating portion 20 , and the second vibrating portion 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. The electrical signal from the transmission path and the magnetic field of the first magnetic gap G1 cause the first coil 22 to vibrate along with the first voice coil bobbin 21, causing the first vibrating part 20 to vibrate. This causes sound to be radiated. At this time, a first excitation force corresponding to the vibration of the first vibrating part 20 is generated in the speaker 10. This first excitation force causes the housing fixed to the speaker 10 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. The electrical signal from the transmission path and the magnetic field of the second magnetic gap cause the second coil 32 to vibrate together with the second voice coil bobbin 31, resulting in the vibration of the second vibrating unit 30. The first vibrating portion 20 and the second vibrating portion 30 are configured to operate in opposite phases. Specifically, when the first vibrating portion 20 moves forward, the second vibrating portion 30 moves backward, and when the first vibrating portion 20 moves backward, the second vibrating portion 30 moves forward. This can be achieved by adjusting the magnetization direction of each magnet, the direction of current flow, and the winding direction of the coil.

[0067] Effects Next, the effects of this embodiment will be described.

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

[0069] In this embodiment, speaker 10 further includes a second vibrating portion 30 that vibrates to cancel out the vibration of speaker 10 as a whole caused by first vibrating portion 20. Second vibrating portion 30 includes a second voice coil bobbin 31, a second coil 32, and a second damper 37. Consequently, the vibration of first vibrating portion 20 transmitted to frame 50 is canceled out. Furthermore, the generation of unnecessary vibration transmitted to frame 50 can be suppressed, thereby suppressing the vibration of speaker 10. Consequently, a decrease in sound quality caused by the vibration of speaker 10 is suppressed.

[0070] However, in conventional techniques in which the inner edge 24a of the diaphragm 24 is directly bonded to the first voice coil bobbin 21, a significant inclination is sometimes provided near the inner edge of the diaphragm 24 to ensure adequate rigidity of the diaphragm 24 and suppress reverse vibration. However, providing a significant inclination near the inner edge of the diaphragm 24 increases the height (overall height and front-to-back dimension) of the diaphragm 24, which in turn hinders the reduction in thickness of the loudspeaker 10. Therefore, in this embodiment, the first vibrating part 20 includes the coupler 23 . The inner edge 24 a of the diaphragm 24 is arranged radially outward from the outer circumference of the first voice coil bobbin 21 , and the inner edge 24 a of the diaphragm 24 and the first voice coil bobbin 21 are connected via the coupler 23 . Specifically, coupler 23 replaces the inner edge of the diaphragm in the conventional art. This makes it easier to maintain the rigidity of the assembly consisting of coupler 23 and diaphragm 24 without increasing the height of diaphragm 24. As a result, speaker 10 can be made thinner while suppressing reverse vibration of diaphragm 24.

[0071] Furthermore, in this embodiment, coupler 23 includes avoidance portion 23a to prevent interference with second voice coil bobbin 31. Therefore, compared to a case where coupler 23 does not include avoidance portion 23a, first vibrating portion 20 and second vibrating portion 30 can be positioned closer together. Consequently, speaker 10 can be made thinner. In particular, although not shown in the figure, in this embodiment, when the first voice coil bobbin 21 and the second voice coil bobbin 31 are closest to each other in the front-rear direction, the front end of the second voice coil bobbin 31 is located in the avoidance portion 23 a.

[0072] In this embodiment, the inner edge 27 a of the first damper 27 is disposed radially outward from the outer circumference of the first voice coil bobbin 21 , and the inner edge 27 a of the first damper 27 and the first voice coil bobbin 21 are connected via the coupler 23 . That is, the connection between the diaphragm 24 and the first voice coil bobbin 21 and the connection between the first damper 27 and the first voice coil bobbin 21 are achieved through the coupler 23 . Therefore, compared with a case where the connection between the diaphragm 24 and the first voice coil bobbin 21 and the connection between the first damper 27 and the first voice coil bobbin 21 are respectively realized at different positions in the front-back direction, the speaker 10 can be made thinner.

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

[0074] In addition, in this embodiment, Figure 4 As shown in FIG. 1 , the coupler 23 has a recess 23 b corresponding to the position where the transmission path is to be arranged. Therefore, the transmission path can be easily arranged.

[0075] In addition, in this embodiment, Figure 4 As shown, the coupler 23 is formed by inserting a conductive relay member 23 c. Therefore, the relay member 23 c 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] In addition, in this embodiment, Figure 1 As shown, the first vibrating portion 20 has an edge 25 that elastically supports the outer edge 24b of the vibration plate 24. The outer edge 27b of the first damper 27 is located radially outward from the outer edge 24b of the vibration plate 24. Therefore, first damper 27 is located behind outer edge 24b of diaphragm 24, which can suppress interference between outer edge 24b of diaphragm 24 and other components. Therefore, the distance between diaphragm 24 and first damper 27 in the front-to-back direction can be set small, making speaker 10 thinner.

[0077] However, 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 changes significantly. Therefore, in this embodiment, the frame 50 has a second opening 59B (see FIG. 5B ) that connects the space between the first damper 27 and the second damper 37 inside the speaker 10 and the space outside the speaker 10. Figure 7 ). Therefore, the air in the space between the first damper 27 and the second damper 37 inside the speaker 10 can be released.

[0078] In addition, in this embodiment, Figure 1 As shown, the coupler 23 includes a vertical wall portion 65 against which the inner edge portion 24a of the vibration plate 24 abuts. Therefore, the vertical wall portion 65 of the coupler 23 serves as a guide, and the vibration plate 24 can be arranged 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. A first magnetic gap G1 is formed between the intermediate magnetic member 43 and the first magnetic member 41, and a second magnetic gap G2 is formed between the intermediate magnetic member 43 and the second magnetic member 45. Therefore, the intermediate magnetic member 43 can serve 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] Furthermore, in this embodiment, the second vibrating portion 30 includes a weight 39. Therefore, compared to a case where the second vibrating portion 30 does not include a weight 39, the amplitude of the second vibrating portion 30 can be reduced while still maintaining the effect of canceling out the overall vibration of the loudspeaker 10. Consequently, the loudspeaker 10 can be made thinner.

[0081] Furthermore, in this embodiment, the second voice coil bobbin 31 protrudes forward (upward) relative to the counterweight 39. In other words, the counterweight 39 does not protrude forward relative to the second voice coil bobbin 31. Therefore, compared to, for example, arranging the counterweight 39 so as to hang from the front end of the second voice coil bobbin 31, it is easier to reduce the thickness of the loudspeaker 10.

[0082] Furthermore, in this embodiment, second damper 37 comprises two elastic members 37A and 37B. Therefore, the movement symmetry and linearity of second vibrating portion 30 during vibration are excellent. Furthermore, counterweight 39 is positioned between the two elastic members 37A and 37B. Therefore, counterweight 39 does not adversely affect the thinness of speaker 10.

[0083] In addition, in this embodiment, Figure 6 As shown, the counterweight 39 has a recessed portion 39a in a portion of the circumference thereof to increase the distance between the counterweight 39 and the second voice coil bobbin 31. Therefore, when welding or other operations are performed on the outer circumference of the second voice coil bobbin 31, the recessed portion 39a is provided at a position corresponding to the welded portion. This prevents short circuits between the second voice coil bobbin 31 and the counterweight 39 caused by welding slag or other metal components.

[0084] In addition, in this embodiment, Figure 3 As shown, second damper 37 includes first elastic body 37A integrated with transmission path (ribbon wiring 82 ). Therefore, no space for the transmission path is required, which contributes to reducing the thickness of speaker 10 .

[0085] (Second embodiment) Figure 8 A speaker 110 according to a second embodiment is shown.

[0086] In the second embodiment, the structure of the second vibrating portion 130 is different from the second vibrating portion 30 of the first embodiment. The second vibrating portion 130 includes a second damper 137. The second damper 137 comprises a first elastic body 137A and a second elastic body 37B, which are arranged overlapping in the vibration direction. Furthermore, the first elastic body 37A has a recessed portion 37A1 that is recessed in the direction toward the second elastic body 37B in the vibration direction. The weight 139 is located on the surface of the recessed portion 37A1 opposite the second elastic body 37B. This eliminates the need to place the weight 39 between the first elastic body 137A and the second elastic body 37B, and can prevent the second vibrating portion 30 from increasing in size in the amplitude direction.

[0087] [Supplementary explanation] While the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments.

[0088] There is no particular limitation on the materials used for the various parts of the first vibrating part 20 and the second vibrating part 30, 130. For example, the vibrating plate 24, the first damper 27, the elastomers 37A, 37B and the cap 26 can be made of various materials such as paper, resin, metal or a composite material of these, ceramic material, etc. In addition, the edge 25 can be made of a relatively high elastic polymer material such as rubber or resin. In addition, in addition to the cases mentioned above, fiber materials can also be used as the materials for the various parts of the first vibrating part 20 and the second vibrating part 30, 130. In addition, the base materials used for the various parts of the first vibrating part 20 and the second vibrating part 30, 130 can be coated with a rubber coating or the like. The frame 50 and the spacer 38 can be made of a non-magnetic material such as a resin, paper or metal.

[0089] The diameter and thickness of each component shown in each drawing are examples, and the components are not limited to these shapes and sizes.

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

[0091] In the above embodiment, 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 thereto. The recess may be formed at least partially at the position where the transmission path is provided. In addition, when the coupler is provided with the relay member, the coupler may not have the recessed portion.

[0092] In the above embodiment, the conductive relay member 23c is described as an example of insert molding the coupler 23, but the relay member of the present disclosure is not limited thereto. The relay member may be held on the coupler by a method other than insert molding.

[0093] In addition, the structure of the counterweight 39 is not limited to the above-mentioned embodiment. For example, the counterweight can be attached to the inner circumference of the voice coil bobbin or to the front end of the voice coil bobbin. Furthermore, the shape of the counterweight is not limited to annular; for example, a polygonal shape is also possible. Furthermore, the counterweight does not need to have a recess. Furthermore, the counterweight can be insulated from the voice coil.

[0094] In addition, the structure of the second damper 37 is not limited to the above-mentioned embodiment. For example, the elastic body of the second damper can be one sheet, also can be more than three sheets.In addition, can not be provided with spacer 38, by arranging step on frame, two sheets of elastic bodies are installed on the frame.

[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 speakers 20 First vibration part 21. First voice coil frame 22 First coil 23 Coupler 23a Avoidance 23b recess 23c Relay component 24 Vibration Plate 24a Inner edge 24b outer edge 25 Edge 27 First damper 27a Inner edge 27b outer edge 30 Second vibration part 31 Second voice coil frame 32 Second coil 37 Second damper 37A First elastic body 37B Second elastic body 39 counterweight 39a recess 40 Magnetic Circuit 50 frames 59B Second opening (opening) 65 Second longitudinal wall portion (longitudinal wall portion) 82 Strip wiring (wiring) 110 speakers 130 Second Vibration Unit 137 Second damper 137A First elastic body 139 Counterweight G1 First magnetic gap G2 Second magnetic gap O1 center axis

Claims

1. A loudspeaker comprising: magnetic circuit; A first vibration part having a first voice coil bobbin, a first coil and a first damper; A second vibration part having a second voice coil bobbin, a second coil, a second damper and a counterweight; The magnetic circuit has: First Magnet; a first magnetic member mounted on the first magnet; a first magnetic yoke mounted on the first magnet and forming a first magnetic gap with the first magnetic member; A second magnetic yoke forms a second magnetic gap with the first magnetic yoke. 2 . The speaker according to claim 1 , wherein the second voice coil bobbin protrudes upward relative to the weight.

3. The loudspeaker according to claim 1, wherein the second damper comprises two elastic bodies. The counterweight is configured between the two elastic bodies.

4. The speaker according to claim 1, wherein the second damper includes a first elastic body and a second elastic body arranged to overlap in a vibration direction. The first elastic body has a concave portion that is concave in a direction close to the second elastic body in the vibration direction. The weight is arranged on a surface of the recessed portion on the opposite side to the second elastic body.

5. The loudspeaker according to claim 1, wherein the counterweight is annular and surrounds the second voice coil bobbin. The weight has a recessed portion at a portion of its circumference for increasing the distance between the weight and the second voice coil bobbin. The speaker according to claim 1 , wherein the second damper includes an elastic body integrated with a wiring.

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