SPEAKER

Abstract

A loudspeaker having a structure suitable for reducing a thickness is provided. A loudspeaker 10 includes a magnetic circuit 40, a first vibration section 20, and a second vibration section 30. The magnetic circuit 40 includes a first magnet 42, a first magnetic element 41 attached to the first magnet 42, a first yoke 43 attached to the first magnet 42, and a second yoke 45. The first yoke 43 forms a first magnetic gap G1 between itself and the first magnetic element 41 and forms a second magnetic gap G2 between itself and the second yoke 45. Further, the second vibration section 30 includes a weight 39.

Description

Technical area

[0001] The present invention relates to a loudspeaker. Technical background

[0002] Patent Document 1 discloses a speaker device for realizing high-quality sound reproduction.

[0003] The speaker device includes a first magnetic circuit, a main body portion having a function of outputting sound waves, a second magnetic circuit integrally formed with the first magnetic circuit, and a vibration suppressing portion. The main body portion includes a first vibration portion driven by the first magnetic circuit, and the vibration suppressing portion includes a second vibration portion driven in an opposite direction to the first vibration portion by the second magnetic circuit. The second vibration portion imparts vibration to the second magnetic circuit, canceling the vibration imparted to the first magnetic circuit by the first vibration portion. Prior art documentsPatent documents

[0004] Patent Document 1: Japanese Patent Application Laid-Open (JP-A) No. 2006-13587 Summary of the Invention Problem to be solved by the invention

[0005] There is room for improvement in the technology described above regarding reducing the thickness of loudspeakers.

[0006] An object of the present disclosure is to provide a loudspeaker having a structure suitable for thickness reduction. Means to solve the problem

[0007] A loudspeaker according to a first aspect comprises: a magnetic circuit; a first vibration section comprising a first bobbin, a first coil, and a first damper; and a second vibration section comprising a second bobbin, a second coil, a second damper, and a weight, wherein the magnetic circuit comprises a first magnet, a first magnetic member fixed to the first magnet, a first yoke fixed to the first magnet and forming a first magnetic gap between the first yoke and the first magnetic member, and a second yoke forming a second magnetic gap between the second yoke and the first yoke.

[0008] In the present aspect, the speaker includes the magnetic circuit, the first vibration section, and the second vibration section.

[0009] The first vibration section includes the first coil support, the first coil and the first damper, and the second vibration section includes the second coil support, the second coil and the second damper.

[0010] Furthermore, in the present aspect, the magnetic circuit comprises the first magnet, the first magnetic element, the first yoke, and the second yoke. The first yoke forms the first magnetic gap between itself and the first magnetic element and forms the second magnetic gap between itself and the second yoke.

[0011] For this reason, the first yoke can serve as a path for both a magnetic flux passing through the first magnetic gap and a magnetic flux passing through the second magnetic gap, and a reduction in the thickness of the magnetic circuit can be achieved.

[0012] In this respect, the second vibration section includes the weight.

[0013] For this reason, compared to an aspect in which the second vibration portion does not include the weight, the oscillation amount of the second vibration portion can be reduced while maintaining the force generated by the second vibration portion. As a result, a reduction in the thickness of the speaker can be achieved. Note that reducing the thickness of the speaker means reducing the size of the speaker in the vibration direction (oscillation direction) of the first vibration portion, meaning reducing the overall height of the speaker.

[0014] Note that in the embodiments described later, an example is explained in which the second vibration section vibrates to cancel vibrations of the entire speaker by the first vibration section. However, the first vibration section and the second vibration section of the present aspect are not limited to this. The second vibration section may vibrate in the same direction in synchronization with the first vibration section, or may vibrate in a different vibration mode for a different function.

[0015] A loudspeaker according to a second aspect is the loudspeaker of the first aspect, wherein the second coil former projects outwardly upwardly in terms of weight.

[0016] In the present aspect, the second coil support protrudes outwardly upward with respect to the weight. In other words, the weight does not protrude outwardly toward the side of the first oscillation section that is upward with respect to the second coil support.

[0017] For this reason, a reduction in the thickness of the speaker can be achieved more easily than in an aspect in which, for example, the weight is arranged to be hooked to an upper end of the second coil former.

[0018] A loudspeaker according to a third aspect is the loudspeaker according to the first or second aspect, wherein the second damper comprises two elastic bodies and the weight is arranged between the two elastic bodies.

[0019] In the present aspect, the second damper comprises two elastic bodies. Therefore, the symmetry and linearity of the movement of the second oscillating section during oscillation are improved.

[0020] Furthermore, the weight is located between the two elastic bodies. Therefore, the weight has no adverse effect on reducing the speaker's thickness.

[0021] A loudspeaker according to a fourth aspect is the loudspeaker according to any one of the first to third aspects, wherein the second damper includes a first elastic body and a second elastic body arranged to overlap each other in a vibration direction, the first elastic body includes 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 on a side opposite to the second elastic body.

[0022] In the present aspect, the second damper includes the first elastic body and the second elastic body arranged to overlap each other in the vibration direction. Further, the first elastic body includes the recessed portion recessed in the direction approaching the second elastic body in the vibration direction, and the weight is arranged on a surface of the recessed portion on the opposite side to the second elastic body.

[0023] For this reason, it is not necessary to perform work for disposing the weight between the first elastic body and the second elastic body, and the increase in a dimension of the second oscillation portion in the oscillation direction can be suppressed.

[0024] A loudspeaker according to a fifth aspect is the loudspeaker according to any one of the first to fourth aspects, wherein the weight has a ring shape surrounding the second coil former. The weight is arranged at a distance from the second coil former in a radial direction. The weight includes a concave portion that increases the spacing between the weight and the second coil former at a portion thereof in the circumferential direction.

[0025] In the present aspect, the weight includes the concave portion that increases the spacing between the weight and the second coil support at the portion thereof in the circumferential direction.

[0026] For this reason, in a case where soldering or the like is performed on an outer peripheral surface of the second bobbin, by providing the concave portion to correspond to a location where the soldering is performed, a short circuit between the second bobbin and the weight due to solder waste, other metal components, or the like can be suppressed.

[0027] A loudspeaker according to a sixth aspect is the loudspeaker according to any one of the first to fifth aspects, wherein the second damper comprises an elastic body integrated with wiring.

[0028] In the present aspect, the second damper includes the elastic body integrated with the wiring.

[0029] For this reason, it is not necessary to provide an arrangement space for wiring, which facilitates a reduction in the thickness of the speaker. Short explanation of the drawings Fig. 1 is a cross-sectional view of a loudspeaker according to a first embodiment. Fig. 2 is an exploded perspective view of a first vibration section. Fig. 3 is an exploded perspective view of a second vibration section. Fig. 4 is a perspective view of a connecting element. Fig. Figure 5 is an end view in cross section of the connecting element. Fig. 6 is a perspective view of a weight. Fig. 7 is an enlarged partial view of a frame. Fig. 8 is a cross-sectional view of a loudspeaker according to a second embodiment. Embodiments for implementing the invention (First embodiment)

[0030] A loudspeaker 10 according to a first embodiment of the present disclosure will be described with reference to Fig. 1 to 7 explained. Fig. 1 is a cross-sectional view taken along an XZ plane passing through a central axis O1 of the loudspeaker 10.

[0031] Loudspeaker 10 is installed, for example, on a vehicle door. Loudspeaker 10 is, for example, a woofer or subwoofer and capable of reproducing bass tones with high input. A main section of loudspeaker 10 is axially symmetrical with respect to the central axis O1.

[0032] The loudspeaker 10 includes a first vibrating section 20 that vibrates to output sound, a second vibrating section 30 that vibrates to cancel vibrations of the entire loudspeaker 10 by the first vibrating section 20, a magnetic circuit 40, and a frame 50 that supports these components.

[0033] In the following explanation, a direction parallel to the central axis O1 is referred to as an axial direction, a direction from the second vibration section 30 toward the first vibration section 20 in the axial direction is referred to as a forward direction or an upward direction, and a direction from the first vibration section 20 toward the second vibration section 30 is referred to as a backward direction or a downward direction. Further, a direction perpendicular to the central axis O1 is referred to as a radial direction. (First oscillation section 20)

[0034] The first vibration section 20 comprises a first coil carrier 21, a first coil 22, a first damper 27, a diaphragm 24, an edge 25, a cap 26 and a connecting element 23.

[0035] The first coil support 21 has a cylindrical shape coaxial with the central axis O1. The first coil 22 is formed by winding it around an outer peripheral surface of a rear end portion of the first coil support 21.

[0036] The diaphragm 24 is a member that emits sound by vibrating. The diaphragm 24 has a circular opening at a center thereof, which is coaxial with the central axis O1 and has a shape that extends toward an outer side in the radial direction and in a forward direction from an inner edge portion 24a forming the circular opening.

[0037] The inner edge portion 24a of the membrane 24 is joined to the connecting element 23.

[0038] An outer edge portion 24b of the diaphragm 24 and the frame 50 are connected by the edge 25. An inner edge portion 25a of the edge 25 is joined to a front surface of the outer edge portion 24b of the diaphragm 24. The edge 25 is annular and has a U-shaped cross-section that is convex toward the front surface. An outer edge portion 27b of the edge 25 is joined to the frame 50.

[0039] The first damper 27 supports the first coil former 21 so that it can vibrate along the direction of the central axis O1. The first damper 27 is arranged on an outer side in the radial direction of the first coil former 21 and on the back of the diaphragm 24.

[0040] The first damper 27 is configured from a single elastic body 27A. The elastic body 27A is an elastic body having a circular opening coaxial with the center axis O1 at a center thereof, and having an annular disc shape extending toward the outside in the radial direction from an inner edge portion 27a forming the circular opening, and having a ribbed shape (concretely, a shape corrugated in accordance with a position in a radial direction forward and backward).

[0041] The inner edge portion 27a of the elastic body 27A is connected to a front surface of an outer edge portion (fourth horizontal portion 69; see Fig. 5) of the connecting member 23, and an outer edge portion 27b of the elastic body 27A is joined to the frame 50.

[0042] As in Fig. 2, two band-shaped wirings 81 (wirings, transmission path) are integrated with the elastic body 27A. Each band-shaped wiring 81 is provided along the shape of the elastic body 27A on a front surface side of the elastic body 27A. So to speak, each band-shaped wiring 81 has a ribbed shape. The two band-shaped wirings 81 are arranged at positions that are symmetrical in the Y direction and each extend in parallel along the X direction. A connecting portion 82a on the inside of each band-shaped wiring 82 is provided with a second extension portion 23c2 (see Fig. 4) of a relay element 23c, which will be described later.

[0043] The cap 26 is a member that emits sound by vibrating. The cap 26 covers the first coil former 21 and the connecting member 23 from the front. An outer edge portion of the cap 26 is joined to a front surface of the diaphragm 24.

[0044] The connecting member 23 is a member that emits sound by vibrating. The connecting member 23 is a member disposed on an outer peripheral side of the first coil former 21, and the connecting member 23 connects the first coil former 21 and the diaphragm 24, and connects the first coil former 21 and the first damper 27.

[0045] As in Fig. 4, the connecting element 23 has a configuration that is basically axisymmetric with respect to the central axis O1.

[0046] As in Fig. 5, the connecting member 23 includes, from an inner edge portion toward an outer edge portion, 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 configurations have shapes that are axisymmetric with respect to the central axis O1; except for portions where concave portions 23b, as described later, are formed.

[0047] The first horizontal portion 61 is a portion extending slightly from a rear end of the first vertical wall portion 62 toward an inner side in the radial direction. The first horizontal portion 61 forms a circular opening coaxial with the center axis O1. In a state where the first coil support 21 is inserted into the circular opening, the outer peripheral surface of the first coil support 21 is joined to the first horizontal portion 61 and the first vertical wall portion 62.

[0048] The first vertical wall portion 62 has a cylindrical shape. A slight gap in the radial direction is formed between an inner peripheral surface of the first vertical wall portion 62 and the outer peripheral surface of the first coil support 21. An adhesive is poured into this gap.

[0049] The first inclined portion 63 has a shape that is inclined forward toward the outside in the radial direction. The first inclined portion 63 facilitates a process of pouring the adhesive that joins the first coil former 21 and the connecting member 23 together.

[0050] The first horizontal portion 64 is a portion extending from a front end of the first inclined portion 63 toward the outside in the radial direction.

[0051] The second vertical wall portion 65 has a cylindrical shape. The inner edge portion 24a of the diaphragm 24 is joined to an outer peripheral surface of the second vertical wall portion 65.

[0052] An avoidance section 23a is formed by the first inclined section 63, the second horizontal section 64, and the second vertical wall section 65. The avoidance section 23a is provided to prevent interference between the connecting member 23 and the second coil former 31 when the speaker 10 is operated. The avoidance section 23a is, so to speak, a portion of the first vibration section 20 that is shaped to deflect toward the front to prevent interference with the second coil former 31.

[0053] The third horizontal portion 66 is a portion extending slightly toward the outside in the radial direction from a rear end of the second vertical wall portion 65. The second inclined portion 67 has a shape that slopes backward toward the outside in the radial direction. The third vertical wall portion 68 is a portion extending slightly backward from a rear end of the second inclined portion 67.

[0054] The fourth horizontal portion 69 is a portion extending from a rear end of the third vertical wall portion 68 toward the outside in the radial direction. The fourth horizontal portion 69 configures an outer edge portion of the connecting member 23. The elastic body 27A of the first damper 27 is joined to a front surface of the fourth horizontal portion 69 by an adhesive or the like.

[0055] As in Fig. As illustrated in Figure 4, the connecting member 23 includes two concave portions 23b. The two concave portions 23b are formed at positions symmetrical with respect to the Y direction. At the portions where the concave portions 23b are formed, a front surface of the connecting member 23 is recessed toward the rear or inner side in the radial direction. Each concave portion 23b is formed in a region extending in the X direction, as viewed from a +Z direction, which is the front side.

[0056] Specifically, each concave portion 23b includes 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 recessing the front surface of the second horizontal portion 64 toward the rear side and has a normal direction facing the front side. The vertical surface 23b2 is a surface formed by recessing the second vertical wall portion 65, the third horizontal portion 66, the second inclined portion 67, and the third vertical wall portion 68 toward the inner side in the radial direction and has a normal direction facing the outer side in the radial direction.The second horizontal surface 23b3 is a surface formed by recessing the third horizontal portion 66, the second inclined portion 67, and the third vertical wall portion 68 toward the rear, and has a normal direction facing the front. The second horizontal surface 23b3 is formed on the same plane as a front surface of the fourth horizontal portion 69.

[0057] Furthermore, the connecting element 23 is formed by insert molding using two relay elements 23c as inserts. The two relay elements 23c are conductive elements and are arranged at positions corresponding to the two concave portions 23b. The two relay elements 23c each have the same configuration.

[0058] Each relay element 23c is a member obtained by bending an elongated plate member. The relay element 23c includes a first extension portion 23c1 extending in the axial direction and a second extension portion 23c2 extending in a direction perpendicular to the axial direction (X direction). The plate member configuring the relay element 23c is folded at a right angle at a rear end portion of the first extension portion 23c1, and the second extension portion 23c2 extends in a +X direction from this portion.

[0059] A portion on a front end side of the first extension portion 23c1 protrudes outward toward the front side from the first horizontal surface 23b1 of the concave portion 23b of the connecting member 23, and a wiring (not illustrated in the drawings) connected to the first coil 22 is connected to this portion by soldering. Since the portion on the front end side of the first extension portion 23c1 protrudes outward toward the front side from the first horizontal surface 23b1 of the concave portion 23b in this way, a front-to-rear dimension of the first extension portion 23c1 can be reduced while ensuring a front-to-rear dimension of the outwardly projecting portion.

[0060] A front surface of a portion of the second extension portion 23c2 on a +X direction side is exposed to the second horizontal surface 23b3 of the concave portion 23b of the connecting member 23 and the front surface of the fourth horizontal portion 69, and the connecting portion 81a on the inside of the band-shaped wiring 81 integrated with the elastic body 27A of the first damper 27 is joined to this portion by soldering. (Second oscillation section 30)

[0061] As in Fig. 1 and Fig. 3, the second vibration section 30 includes the second coil support 31, a second coil 32, a second damper 37, a spacer 38, and a weight 39.

[0062] The second coil support 31 has a cylindrical shape that is coaxial with the central axis O1. The second coil support 31 has a larger diameter than the first coil support 21.

[0063] The second coil 32 is formed by winding it around an outer peripheral surface of a rear end portion of the second coil support 31.

[0064] In the non-operational state, which is Fig. 1 (a state in which the speaker 10 is not driven), a front end of the second coil bobbin 31 is arranged further toward the front than a rear end of the first coil bobbin 21.

[0065] The second damper 37 supports the second coil carrier 31 so that it can swing in the axial direction with respect to the frame 50.

[0066] The second damper 37 includes a first elastic body 37A and a second elastic body 37B arranged at a distance from each other in the axial direction. Each of the first elastic body 37A and the second elastic body 37B has a circular opening coaxial with the central axis O1 at a center thereof, is a disk-shaped elastic body extending toward the outside in the radial direction from an inner edge portion forming the circular opening, and has a ribbed shape. The first elastic body 37A and the second elastic body 37B have substantially the same configuration. Therefore, when the first elastic body 37A and the second elastic body 37B move in parallel in the axial direction, their cross-sectional shapes overlap each other.

[0067] The spacer 38 for maintaining a distance in the axial direction between the first elastic body 37A and the second elastic body 37B is provided at an outer edge portion of the second damper 37. A surface on a rear side of an outer edge portion of the second elastic body 37B is joined to the frame 50. An inner edge portion of the first elastic body 37A and an inner edge portion of the second elastic body 37B are joined to an outer peripheral surface of the second coil bobbin 31.

[0068] Two band-shaped wirings 82 (wirings, transmission path) are integrated with the first elastic body 37A. Each band-shaped wiring 82 is provided along the shape of the first elastic body 37A on a front side of the first elastic body 37A. In other words, each band-shaped wiring 82 has a ribbed shape.

[0069] The two ribbon-shaped wirings 82 are arranged at positions symmetrical with respect to the Y direction and each extend in parallel along the X direction. A connecting portion 82a on the inner side of each ribbon-shaped wiring 82 is connected to a transmission path formed on the outer peripheral surface of the second coil bobbin 31.

[0070] The weight 39 is provided to increase the mass of a portion supported and vibrated by the second damper 37. Increasing the mass of the portion supported and vibrated by the second damper 37 makes it possible to reduce the amount of oscillation of the second vibrating portion 30 while maintaining the effect of canceling vibrations of the entire speaker 10 by the second vibrating portion 30.

[0071] The weight 39 is annular and has a ring shape along the cylindrical shape of the second coil support 31. The weight 39 is provided in a vicinity of an inner edge portion of the second damper 37. Specifically, it is arranged between the first elastic body 37A and the second elastic body 37B in the vicinity of the inner edge portion of the second damper 37. Thus, the weight 39 is arranged to surround the second coil support 31.

[0072] Fig. 6 is an enlarged perspective view of the weight 39. The weight 39 has two concave portions 39a. Since the weight 39 includes the concave portions 39a, a spacing between an inner peripheral surface of the weight 39 and the outer peripheral surface of the second coil bobbin 31 is increased at portions in a circumferential direction where the concave portions 39a are formed. The two concave portions 39a are formed at positions facing each other with the center axis O1 therebetween. One of the two concave portions 39a is formed in a region including positions where the connecting portions 82a on the inside of the two band-shaped wirings 82 described above are connected to the transmission path formed on the outer peripheral surface of the second coil bobbin 31.

[0073] Specifically, the weight 39 includes 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 flat surface with a normal direction facing the front side, and the rear surface 72 is a flat surface with a normal direction facing the rear side. The outer peripheral surface 73 is a curved surface with a normal direction facing the outside in the radial direction and is formed on a single circumference centered on the central axis O1 as viewed from the axial direction. The inner peripheral surface 74 includes first inner peripheral surfaces 74a corresponding to positions in the circumferential direction where the concave portions 39a are not formed, and second inner peripheral surfaces 74b corresponding to positions in the circumferential direction where the concave portions 39a are formed.Two first inner peripheral surfaces 74a and two second inner peripheral surfaces 74b are formed. The first inner peripheral surfaces 74a and the second inner peripheral surfaces 74b are both curved surfaces with a normal direction facing the inner side in the radial direction and are formed on arcs centered on the central axis O1 as viewed from the axial direction.

[0074] Furthermore, the weight 39 has connecting surfaces 74c that connect the first inner peripheral surfaces 74a and the second inner peripheral surfaces 74b. Two connecting surfaces 74c are formed with respect to a second inner peripheral surface 74b. These two connecting surfaces 74c face each other in one direction (Y direction). In other words, these two connecting surfaces 74c are parallel to each other. (magnetic circuit 40)

[0075] As in Fig. As illustrated in Figure 1, the magnetic circuit 40 includes a first magnetic element 41 (a top plate), a first magnet 42, an intermediate magnetic element 43 (a first yoke), a second magnet 44, and a second magnetic element 45 (a second yoke). The magnetic circuit 40 is formed by coaxially stacking the second magnet 44, the intermediate magnetic element 43, the first magnet 42, and the first magnetic element 41 in this order, starting from the second magnetic element 45 located at the rearmost side.

[0076] By providing a configuration in which magnetic circuits corresponding to the first vibration section 20 and the second vibration section 30 are configured by the single magnetic circuit 40, and in which the magnetic circuit 40 is stacked from the back side in this manner, the assembly performance in a manufacturing process can be improved.

[0077] The second magnetic member 45 includes a disc-shaped bottom portion 45a, a cylindrical portion 45b erected toward the front side from an outer edge portion of the bottom portion 45a, a columnar convex portion 45c protruding outward toward the front side from a center portion of the bottom portion 45a, and a mounting flange 45d extending toward an outer side in the radial direction from a front end of the cylindrical portion 45b. The mounting flange 45d is fixed to the frame 50. A recess 45a1 is provided on a rear surface of the bottom portion 45a.

[0078] The second magnet 44 is joined to a front surface of the convex portion 45c. The second magnet 44 has a columnar shape. A diameter of the second magnet 44 is larger than the diameter of the first magnet 42.

[0079] The magnetic intermediate member 43 is joined to a front surface of the second magnet 44. The magnetic intermediate member 43 includes a disc-shaped bottom portion 43a, a cylindrical portion 43b erected toward the front side from a peripheral edge of the bottom portion 43a, and a columnar convex portion 43c protruding outward toward the front side from a central portion of the bottom portion 43a.

[0080] The first magnet 42 is joined to a front surface of the convex portion 43c. The first magnet 42 has a columnar shape. A diameter of the first magnet 42 is approximately equal to a diameter of the convex portion 43c.

[0081] The first magnetic element 41 is joined to a front surface of the first magnet 42. The first magnetic element 41 has a columnar shape. A diameter of the first magnetic element 41 is slightly larger than the diameter of the first magnet 42.

[0082] A diameter of the bottom portion 43a of the magnetic intermediate member 43 is larger than a diameter of the cylindrical portion 43b. Consequently, an outer peripheral portion 43a1 of the bottom portion 43a protrudes further outward toward the outside in the radial direction than an outer peripheral surface of the cylindrical portion 43b. The outer peripheral portion 43a1 of the bottom portion 43a is referred to as an outer side protruding portion 43a1.

[0083] Meanwhile, the front end of the cylindrical portion 45b of the second magnetic member 45 substantially corresponds to a position of a front surface of the bottom portion 43a of the intermediate magnetic member 43 in the front-to-rear direction.

[0084] Consequently, the projecting outer side portion 43a1 faces a front end portion of the cylindrical portion 43b of the second magnetic member 45 in the radial direction.

[0085] A front end of the cylindrical portion 43b of the intermediate magnetic member 43 is arranged further forward than a front surface of the first magnetic member 41.

[0086] An annular gap is formed between an inner peripheral surface of the cylindrical portion 43b of the intermediate magnetic member 43 and outer peripheral surfaces of the first magnetic member 41, the first magnet 42, and the convex portion 43c. In this gap, a substantially uniform magnetic field is generated in the circumferential direction in a first magnetic gap G1 formed between the outer peripheral surface of the first magnetic member 41 and the inner peripheral surface of the cylindrical portion 43b.

[0087] The bottom portion 43a of the intermediate magnetic member 43, the second magnet 44, and the convex portion 45c of the intermediate magnetic member 43 are disposed on an inner side of the cylindrical portion 45b of the intermediate magnetic member 43. An annular gap is formed between an inner peripheral surface of the cylindrical portion 45b and outer peripheral surfaces of the bottom portion 43a, the second magnet 44, and the convex portion 45c. In this gap, a substantially uniform magnetic field is generated in the circumferential direction in a second magnetic gap G2 formed between the outer peripheral surface of the bottom portion 43a (an outer peripheral surface of the outer side protruding portion 43a1) and the inner peripheral surface of the cylindrical portion 45b.

[0088] Adjusting a protrusion amount of the outer side protruding portion 43a1 makes it possible to decrease a spacing of the second magnetic gap G2, so that a magnetic flux passing through the second magnetic gap G2 can be increased and leakage loss of the magnetic flux can be reduced. (Frame 50)

[0089] The frame 50 comprises a first support portion 51 supporting an outer edge portion 25b of the edge 25, a second support portion 52 supporting the outer edge portion 27b of the first damper 27, and a third support portion 53 supporting the outer edge portion of the second damper 37.

[0090] As in Fig. As illustrated in Figure 7, the first support portion 51, the second support portion 52, and the third support portion 53 are all continuously formed 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, respectively, at respective forward-facing surfaces. The first support portion 51 is located most forward, and the third support portion 53 is located most rearward. A diameter of the first support portion 51 is the largest, and a diameter of the third support portion 53 is the smallest.

[0091] The frame 50 comprises first connecting sections 55 that connect the first support section 51 and the second support section 52. As shown in Fig. As illustrated in Figure 7, a plurality of first connecting portions 55 are provided separately in the circumferential direction. Consequently, a plurality of first openings 59A are formed between the first support portion 51 and the second support portion 52.

[0092] The frame 50 includes second connecting portions 56 that connect the second support portion 52 and the third support portion 53. As shown in Fig. As illustrated in Figure 7, a plurality of second connecting portions 56 are provided separately in the circumferential direction. Consequently, a plurality of second openings 59B are formed between the second support portion 52 and the third support portion 53. The positions in the circumferential direction where the second connecting portions 56 are provided coincide with the first connecting portions 55.

[0093] The frame 50 includes a fourth support portion 54 that supports the magnetic circuit 40. A plate thickness direction of the fourth support portion 54 runs along the axial direction. 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. Consequently, no opening is formed between the third support portion 53 and the fourth support portion 54.

[0094] Next, the relationships between the magnetic circuit 40, the first oscillating portion 20, and the second oscillating portion 30 will be explained.

[0095] The first coil 22 is arranged in the first magnetic gap G1. The first coil 22 is connected to the transmission path. The first coil support 21 vibrates together with the first coil 22 due to an electrical signal from the transmission path and the effect of the magnetic field of the first magnetic gap G1, and as a result, the first vibrating section 20 vibrates. As a result, sound is output.

[0096] When this occurs, a first excitation force is generated at the speaker 10 in response to the vibration of the first vibrating portion 20. The first excitation force causes a cabinet attached to the speaker 10 to vibrate.

[0097] The second coil 32 is arranged 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 coil support 31 vibrates together with the second coil 32 due to the electrical signal from the transmission path and the effect of the magnetic field of the second magnetic gap, causing the second oscillating portion 30 to vibrate as a result.

[0098] The first oscillation section 20 and the second oscillation section 30 are configured to operate in phases opposite to each other. Specifically, the second oscillation section 30 is displaced toward the rear when the first oscillation section 20 is displaced toward the front, and the second oscillation section 30 is displaced toward the front when the first oscillation section 20 is displaced toward the rear. The operation of the first oscillation section 20 and the second oscillation section 30 in phases opposite to each other can be achieved by adjusting the magnetization directions of the respective magnets, the flow direction of the electric current, and the winding directions of the coils. <Wirkungen des Betriebs>

[0099] Next, the effects of the operation of the present embodiment will be explained.

[0100] As in Fig. As illustrated in Figure 1, the loudspeaker 10 in the present embodiment includes the frame 50, the magnetic circuit 40, and the first vibration section 20 that vibrates to output sound. The first vibration section 20 includes the first coil bobbin 21, the first coil 22, the first damper 27, and the diaphragm 24. The first coil 22 and the first coil bobbin 21 are elastically supported by the first damper 27 with respect to the frame 50, and the first coil 22 is driven in cooperation with the magnetic circuit 40, so that the diaphragm 24 vibrates and outputs sound.

[0101] Furthermore, the loudspeaker 10 in the present embodiment further includes the second vibration section 30, which vibrates to cancel vibrations of the entire loudspeaker 10 through the first vibration section 20. The second vibration section 30 includes the second bobbin 31, the second coil 32, and the second damper 37. For this reason, vibrations of the first vibration section 20 transmitted to the frame 50 are canceled. Consequently, the generation of unnecessary vibrations transmitted to the frame 50 can be suppressed, and vibrations of the loudspeaker 10 are suppressed. As a result, deterioration in sound quality due to vibrations of the loudspeaker 10 is suppressed.

[0102] In this regard, in the conventional technique in which the inner edge portion 24a of the diaphragm 24 is directly joined to the first coil bobbin 21, a large inclination is sometimes provided in a vicinity of the inner edge portion of the diaphragm 24 to ensure appropriate strength of the diaphragm 24 and suppress back vibration. However, providing a large inclination in the vicinity of the inner edge portion of the diaphragm 24 increases a height dimension (a total height, a front-to-back dimension) of the diaphragm 24, and as a result, this is disadvantageous for reducing the thickness of the speaker 10.

[0103] Accordingly, in the present embodiment, the first vibration portion 20 includes the connecting member 23. Further, the inner edge portion 24a of the diaphragm 24 is disposed to be spaced apart from the outer peripheral surface of the first coil bobbin 21 on the outside in the radial direction, and the inner edge portion 24a of the diaphragm 24 and the first coil bobbin 21 are connected by the connecting member 23.

[0104] The vicinity of the inner edge portion of the diaphragm in the above-mentioned conventional technique is, so to speak, replaced by the connecting member 23. For this reason, the strength of a member configured to include the connecting member 23 and the diaphragm 24 can be easily ensured without increasing the height dimension of the diaphragm 24. As a result, a reduction in the thickness of the loudspeaker 10 can be achieved while suppressing back vibration of the diaphragm 24.

[0105] Furthermore, in the present embodiment, the connecting element 23 includes the avoidance section 23a, which avoids interference with the second coil former 31. For this reason, the first vibration section 20 and the second vibration section 30 can be arranged closer to each other than in an embodiment in which the connecting element 23 does not include the avoidance section 23a. As a result, a reduction in the thickness of the loudspeaker 10 can be achieved.

[0106] Specifically, in the present embodiment, although not illustrated in the drawings, in a state where the first bobbin 21 and the second bobbin 31 are closest to each other in the front-to-back direction, the front end of the second bobbin 31 is disposed in the avoidance portion 23a.

[0107] Further, in the present embodiment, the inner edge portion 27a of the first damper 27 is arranged to be spaced apart from the outer peripheral surface of the first coil support 21 on the outside in the radial direction, and the inner edge portion 27a of the first damper 27 and the first coil support 21 are connected by the connecting member 23.

[0108] A connection between the membrane 24 and the first coil carrier 21 and a connection between the first damper 27 and the first coil carrier 21 are implemented, so to speak, by the connecting element 23.

[0109] For this reason, a reduction in the thickness of the loudspeaker 10 can be achieved compared with an embodiment in which the connection between the diaphragm 24 and the first coil former 21 and the connection between the first damper 27 and the first coil former 21 are implemented separately at different positions in the front-to-back direction.

[0110] Furthermore, in the present embodiment, the inner edge portion 24a of the diaphragm 24 is located further toward the inside in the radial direction than the inner edge portion 27a of the first damper 27. For this reason, the assembly performance of the first vibration section 20, which includes the connecting member 23, the diaphragm 24, and the first damper 27, is excellent.

[0111] Furthermore, in the present embodiment, as in Fig. As illustrated in Figure 4, the connecting element 23 has concave portions 23b corresponding to the positions where the transmission path is arranged. Therefore, the arrangement of the transmission path is facilitated.

[0112] Furthermore, in the present embodiment, as shown in Fig. As illustrated in Figure 4, the connecting element 23 is formed using the conductive relay elements 23c as inserts. Therefore, a relay can be provided for a transmission path connected to the first coil 22 and a transmission path connected to an exterior of the loudspeaker 10 by the relay elements 23c inserted into the connecting element 23 as inserts.

[0113] Furthermore, in the present embodiment, as in Fig. As illustrated in Figure 1, the first vibration portion 20 includes the edge 25 that elastically supports the outer edge portion 24b of the diaphragm 24. Furthermore, the outer edge portion 27b of the first damper 27 is positioned further outward in the radial direction than the outer edge portion 24b of the diaphragm 24.

[0114] For this reason, the first damper 27 is arranged rearwardly on the outer edge portion 24b of the diaphragm 24, and interference between the outer edge portion 24b of the diaphragm 24 and other elements can be suppressed. Consequently, a small distance can be set between the diaphragm 24 and the first damper 27 in the front-to-rear direction, and a reduction in the thickness of the speaker 10 can be achieved.

[0115] Meanwhile, a volume of a space between the first damper 27 and the second damper 37 in an interior of the loudspeaker 10 varies considerably because the first damper 27 and the second damper 37 are displaced in opposite directions.

[0116] Consequently, in the present embodiment, the frame 50 includes the second openings 59B (see Fig. 7) that connect the space between the first damper 27 and the second damper 37 in the interior of the loudspeaker 10 and a space outside the loudspeaker 10. For this reason, air in the space between the first damper 27 and the second damper 37 in the interior of the loudspeaker 10 can escape.

[0117] Furthermore, in the present embodiment, as in Fig. As illustrated in Figure 1, the connecting member 23 includes the vertical wall portion 65 in contact with the inner edge portion 24a of the diaphragm 24. Therefore, the vertical wall portion 65 of the connecting member 23 becomes a guide, and the diaphragm 24 can be positioned at a desired position relative to the connecting member 23.

[0118] Furthermore, in the present embodiment, the magnetic circuit 40 includes the first magnet 42, the second magnet 44, the first magnetic element 41 fixed to the first magnet 42, the second magnetic element 45 fixed to the second magnet 44, and the intermediate magnetic element 43 fixed to both the first magnet 42 and the second magnet 44. The intermediate magnetic element 43 forms the first magnetic gap G1 between itself and the first magnetic element 41 and forms the second magnetic gap G2 between itself and the second magnetic element 45.

[0119] For this reason, the magnetic intermediate 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 a reduction in the thickness of the magnetic circuit 40 can be achieved.

[0120] Furthermore, in the present embodiment, the second vibration portion 30 includes the weight 39. For this reason, compared with an embodiment in which the second vibration portion 30 does not include the weight 39, the oscillation amount of the second vibration portion 30 can be reduced while maintaining the effect of canceling the vibrations of the entire speaker 10. As a result, a reduction in the thickness of the speaker 10 can be achieved.

[0121] Furthermore, in the present embodiment, the second coil former 31 protrudes outwardly (upwardly) with respect to the weight 39. In other words, the weight 39 does not protrude outwardly with respect to the second coil former 31. For this reason, a reduction in the thickness of the speaker 10 can be achieved more easily than in an embodiment in which the weight 39 is arranged, for example, to be hooked to the front end of the second coil former 31.

[0122] Furthermore, in the present embodiment, the second damper 37 comprises two elastic bodies 37A and 37B. For this reason, the symmetry and linearity of the movement of the second vibrating portion 30 during oscillation are improved. Furthermore, the weight 39 is arranged between the two elastic bodies 37A and 37B. For this reason, the weight 39 does not adversely affect the reduction in the thickness of the loudspeaker 10.

[0123] Furthermore, in the present embodiment, as in Fig. As illustrated in FIG. 6, the weight 39 has concave portions 39a, each of which increases the distance from the second bobbin 31 at a portion in the circumferential direction. For this reason, in a case where soldering or the like is performed on the outer peripheral surface of the second bobbin 31, by providing the concave portions 39a to correspond to a location where the soldering is performed, a short circuit between the second bobbin 31 and the weight 39 due to solder waste, other metal components, or the like can be suppressed.

[0124] Furthermore, in the present embodiment, as in Fig. As illustrated in Figure 3, the second damper 37 includes the first elastic body 37A, which is integrated with the transmission path (the ribbon-shaped wiring 82). Therefore, it is not necessary to provide a layout space for the transmission path, thereby facilitating a reduction in the thickness of the speaker 10. (Second embodiment)

[0125] Fig. 8 illustrates a loudspeaker 110 according to a second embodiment.

[0126] In the second embodiment, a configuration of a second vibration portion 130 is different from that of the second vibration portion 30 of the first embodiment.

[0127] The second vibration section 130 includes a second damper 137. The second damper 137 includes a first elastic body 137A and a second elastic body 37B arranged to overlap each other in a vibration direction. Further, the first elastic body 37A includes a recessed portion 37A1 recessed in a direction approaching the second elastic body 37B in the vibration direction, and a weight 139 is arranged on a surface of the recessed portion 37A1 on a side opposite to the second elastic body 37B. For this reason, it is not necessary to perform work for disposing the weight 39 between the first elastic body 137A and the second elastic body 37B, and the increase in a dimension of the second vibration section 30 in an oscillation direction can be suppressed. <Ergänzende Erklärung>

[0128] While preferred embodiments of the present invention have been explained in detail above, the present invention is not limited to the above-mentioned embodiments. A supplementary explanation is provided below to avoid any misunderstanding.

[0129] The materials for the respective portions of the first vibration portion 20 and the second vibration portions 30 and 130 are not specifically limited. For example, various materials such as paper-based materials, resin-based materials, metal-based materials, composite-based materials in which these materials are combined, ceramic-based materials, and the like can be used for the diaphragm 24, the first damper 27, the elastic bodies 37A and 37B, and the cap 26. Further, for example, a polymer-based material with relatively high elasticity, such as a rubber, a resin, or the like, can be used for the edge 25. Further, in addition to this, a fiber material can be used as a material for respective portions of the first vibration portion 20 and the second vibration portions 30 and 130.Furthermore, in respective portions of the first vibration section 20 and the second vibration sections 30 and 130, a material serving as a base may be coated with a rubber coating or the like. A resin-based material, a paper-based material, a metal-based non-magnetic material, or the like may be used for the frame 50 and the spacer 38.

[0130] The diameters and thicknesses of the respective elements illustrated in the respective drawings are only examples and there is no limitation to these shapes and dimensions.

[0131] In the above-mentioned embodiments, an example in which the connecting member 23 is assembled with a single elastic body (the elastic body 27A) was explained, but the present disclosure is not limited to this. The connecting member may be assembled with two or more elastic bodies.

[0132] Furthermore, in the above-mentioned embodiments, an example in which the diaphragm 24 and the first damper 27 are joined to the connecting member 23 has been explained, but other components (for example, a cap) may be further joined to the connecting member.

[0133] In the above-mentioned embodiments, an example was explained in which the concave portions 23b are formed at positions corresponding to an entire transmission path provided on the connecting member 23, but the concave portions of the present disclosure are not limited thereto. The concave portions may be formed at least a portion of the positions where the transmission path is provided.

[0134] Furthermore, in a case where a relay component is provided on the connecting member, the connecting member need not include a concave portion.

[0135] In the above-mentioned embodiments, an example was explained in which the connecting element 23 is formed using the conductive relay components 23c as inserts, but the relay components of the present disclosure are not limited to this. The relay components may be held to the connecting element by a method other than insert molding.

[0136] Furthermore, the configuration of the weight 39 is also not limited to that of the above-mentioned embodiments.

[0137] For example, the weight may be attached to one side of the inner peripheral surface of the coil former. Furthermore, the weight may be attached to a front end of the coil former. Furthermore, the shape of the weight is not limited to a ring shape and may be, for example, a polygonal shape. Furthermore, the weight need not include a concave portion. Furthermore, the weight may be in contact with a voice coil in an isolated state.

[0138] Furthermore, the configuration of the second damper 37 is also not limited to that of the above-mentioned embodiments.

[0139] For example, the second damper may include one elastic body, or it may include three or more elastic bodies. Furthermore, two elastic bodies may be attached to the frame by providing a step on the frame without providing the spacer 38.

[0140] The disclosure of Japanese Patent Application No. 2023-004734, filed on January 16, 2023, is incorporated by reference in its entirety into this specification. Explanation of reference symbols 10 speakers 20 First oscillation section 21 First coil carrier 22 First coil 23 Connecting element 23a Avoidance section 23b Concave section 23c Relay element 24 membrane 24a inner edge section 24b Outer edge section 25 edge 27 First setback 27a inner edge section 27b Outer edge section 30 Second oscillation section 31 Second coil carrier 32 Second coil 37 Second damper 37A First elastic body 37B Second elastic body 39 Weight 39a Concave section 40 magnetic circuit 50 frames 59B Second opening (opening) 65 Second vertical wall section (vertical wall section) 82 Ribbon wiring (wiring) 110 speakers 130 Second oscillation section 137 Second damper 137A First elastic body 139 Weight G1 First magnetic gap G2 Second magnetic gap O1 central axis QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2006-13587

[0004] JP 2023-004734

[0140]

Claims

[1] Loudspeaker, comprising: a magnetic circuit; a first vibration section comprising a first coil support, a first coil and a first damper; and a second oscillation section comprising a second coil support, a second coil, a second damper and a weight, wherein the magnetic circuit comprises: a first magnet, a first magnetic element 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 element, and a second yoke forming a second magnetic gap between the second yoke and the first yoke. [2] A loudspeaker according to claim 1, wherein the second coil former projects outwardly upwardly with respect to the weight. [3] A loudspeaker according to claim 1, wherein: the second damper comprises two elastic bodies, and the weight is arranged between the two elastic bodies. [4] A loudspeaker according to claim 1, wherein: the second damper comprises a first elastic body and a second elastic body arranged to overlap each other in a vibration direction, the first elastic body comprises a recessed portion which is 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 on a side opposite to the second elastic body. [5] A loudspeaker according to claim 1, wherein: the weight has a ring shape surrounding the second coil carrier, and the weight includes a concave portion that increases a spacing between the weight and the second coil support, at a portion thereof in the circumferential direction. [6] The loudspeaker according to claim 1, wherein the second damper comprises an elastic body integrated with a wiring.

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