Speaker

Abstract

Provided is a speaker that includes a first and a second drive unit and is compact in the axial direction. A speaker 10 includes a first drive unit 30 for emitting sound toward one side in the axial direction, and a second drive unit 40. In an non-operating state, at least part of the second drive unit 40 is located in an inner space of a first bobbin 33.

Description

Speaker

[0001] The present disclosure relates to a speaker.

[0002] The speaker disclosed in Patent Document 1 includes a second driving section in addition to a first driving section for emitting sound.

[0003] International Publication No. 2023 / 090124

[0004] An object of the present disclosure is to provide a speaker that includes a first drive unit and a second drive unit and that is small in size in the axial direction.

[0005] A speaker according to a first aspect is a speaker comprising a first driving unit for emitting sound toward one axial side, and a second driving unit, wherein the first driving unit comprises a first magnetic circuit that forms a first magnetic gap, a first coil that is arranged in the first magnetic gap, and a first bobbin on which the first coil is provided, and the second driving unit comprises a second magnetic circuit that forms a second magnetic gap and a second coil that is arranged in the second magnetic gap, and in an inoperative state, at least a portion of the second driving unit is arranged in the inner space of the first bobbin.

[0006] In this aspect, the speaker includes a first drive unit and a second drive unit for emitting sound toward one side in the axial direction.

[0007] However, since the speaker includes a second drive unit, the speaker requires a space for arranging the second drive unit. If the first drive unit and the second drive unit were simply arranged side by side in the axial direction, the speaker would become large in the axial direction (height direction). Therefore, in this embodiment, in the inactive state, at least a portion of the second drive unit is arranged in the inner space of the first bobbin. This makes it easier to realize a speaker that is small in the axial direction.

[0008] In the embodiments described below, the second drive unit is a drive unit for canceling out the vibration of the entire speaker caused by the first drive unit, but the second drive unit of this aspect is not limited to this. The second drive unit of this aspect may be a drive unit for producing high-pitched sounds, for example, or a drive unit for another function. In the embodiments described below, the second magnetic circuit is formed separately from the first magnetic circuit, but the second magnetic circuit of this aspect is not limited to this. In the embodiments described below, the second magnetic circuit functions as a mover of the second drive unit, but the second magnetic circuit of this aspect is not limited to this. In the embodiments described below, at least a portion of the second magnetic circuit is disposed in the inner space of the first bobbin in the inactive state, but the present aspect is not limited to this.

[0009] A speaker according to a second aspect is the speaker of the first aspect, wherein the second magnetic circuit functions as a mover of the second driving unit.

[0010] In this aspect, the second magnetic circuit functions as the mover of the second drive unit, which makes it easy to achieve a high excitation force for the second drive unit.

[0011] A speaker according to a third aspect is the speaker according to the first or second aspect, wherein the first magnetic circuit and the second magnetic circuit are formed as separate entities, the first magnetic circuit has an inner space located radially inward of the first magnetic gap, and at least a portion of the second driving unit is arranged in the inner space of the first magnetic circuit.

[0012] In this aspect, the first magnetic circuit and the second magnetic circuit are formed as separate bodies. Here, the first magnetic circuit has an inner space located radially inward of the first magnetic gap. At least a portion of the second drive unit is disposed in the inner space of the first magnetic circuit. Therefore, even when the first magnetic circuit and the second magnetic circuit are formed as separate bodies, a speaker that is small in size in the axial direction can be realized.

[0013] A fourth aspect of the present invention relates to the speaker of the third aspect, wherein the inner space of the first magnetic circuit is a space that is open to one and the other axial sides of the first magnetic circuit.

[0014] In this aspect, the inner space of the first magnetic circuit is a space that is open to both sides in the axial direction of the first magnetic circuit, which makes it even easier to reduce the size of the speaker in the axial direction.

[0015] A speaker according to a fifth aspect is any one of the first to fourth aspects, in which the first magnetic circuit includes a first magnet, and the first magnet is positioned radially outward from the first magnetic gap.

[0016] In this aspect, the first magnet of the first magnetic circuit is located radially outward of the first magnetic gap, which makes it easy to increase the cross-sectional area of ​​the magnet while maintaining the size of the inner space of the first magnetic circuit.

[0017] A speaker according to a sixth aspect is any one of the first to fifth aspects, wherein the second magnetic circuit is arranged in an orientation such that the second magnetic gap is open to the other axial side.

[0018] In this aspect, the second magnetic circuit is disposed in a direction in which the second magnetic gap is open to the other axial side, which makes it easy to route wiring from the second coil.

[0019] A speaker according to a seventh aspect is any one of the first to sixth aspects, wherein the second drive unit includes a second damper that elastically supports the movable element and a holding member that holds the second damper, and the holding member houses the second damper and the movable element therein.

[0020] In this aspect, the second drive unit includes a second damper that elastically supports the mover and a holding member that holds the second damper. The holding member houses the second damper and the mover. Therefore, the holding member can protect the second damper and the mover.

[0021] The speaker according to an eighth aspect is the speaker according to the seventh aspect, wherein the holding member has at least one ventilation hole connecting the inside and the outside of the holding member.

[0022] In this aspect, the holding member has at least one ventilation hole connecting the inside and outside of the holding member, which prevents gas inside the holding member from interfering with the driving of the second driving unit.

[0023] A ninth aspect of the speaker is the eighth aspect, wherein the retaining member has a second side portion exposed to the space on the other axial side of the first magnetic circuit, and the second side portion does not have the air vent.

[0024] In this aspect, the holding member has a second side portion that is exposed to the space on the other axial side of the first magnetic circuit, and the second side portion does not have an air vent, which prevents foreign matter from entering the speaker through the air vent.

[0025] A speaker according to a tenth aspect is any one of the first to ninth aspects, wherein the second driving section is a driving section for canceling out vibration of the entire speaker caused by the first driving section.

[0026] In this aspect, the second driving section is a driving section for canceling out the vibration of the entire speaker caused by the first driving section, thereby achieving a speaker with reduced vibration.

[0027] The speaker according to an eleventh aspect is any one of the first to tenth aspects, wherein the second driving unit includes the second magnetic circuit that functions as a mover, a second damper that elastically supports the second magnetic circuit, and a spacer that axially connects the second magnetic circuit and the second damper.

[0028] In this aspect, the second drive unit includes a spacer that axially connects the second magnetic circuit and the second damper. Therefore, compared to when the second damper is directly fixed to the second magnetic circuit, the second damper can be retracted axially outward relative to the second magnetic circuit. This increases the degree of freedom in the shape of the second damper, allowing, for example, the second drive unit to be made smaller (e.g., smaller in the radial direction) while maintaining the performance of the second damper.

[0029] In the embodiment described below, the second damper includes two elastic bodies and the spacer includes two connecting members, but the second damper and spacer of this aspect are not limited to this. The second damper may be composed of a single elastic body, and in this case, the spacer may be composed of a single connecting member.

[0030] According to the present disclosure, it is possible to provide a speaker that includes a first drive unit and a second drive unit and that is small in size in the axial direction.

[0031] FIG. 1 is a cross-sectional end view of a speaker according to an embodiment. However, in some of the drawings, the form seen in the direction of sight from the cross-section is also depicted. FIG. 2 is a cross-sectional end view showing an enlarged view of the periphery of a first magnetic circuit in the speaker. However, illustration of an actuator (second driving unit) is omitted. FIG. 3 is a cross-sectional end view of an actuator (second driving unit). FIG. 4 is a cross-sectional end view showing an enlarged view of the periphery of an actuator (second driving unit) in a speaker according to a modified example.

[0032] A speaker 10 according to an embodiment will be described with reference to FIGS. 1 to 3. FIG.

[0033] 1, the speaker 10 of this embodiment includes a first frame 20 made of, for example, synthetic resin, a first drive unit 30 for emitting sound toward one axial direction, and an actuator 40 serving as a "second drive unit." Hereinafter, the actuator 40 may be referred to as the second drive unit 40.

[0034] The actuator 40 is a drive unit that cancels out vibrations of the entire speaker 10 caused by the first drive unit 30. The first drive unit 30 is supported by the first frame 20, and the actuator 40 is supported by a first magnetic circuit 31 of the first drive unit 30. As shown in FIG. 2, the first magnetic circuit 31 of the first drive unit 30 has an inner space 55 that is open on both axial sides. As shown in FIG. 1, the actuator 40 is disposed in this inner space 55.

[0035] Each component will be described below.

[0036] (First Frame 20 ) As shown in FIG. 1 , the first frame 20 includes an outer tubular portion 21 formed in a substantially cylindrical shape, and an inner support portion 22 provided inside the outer tubular portion 21 .

[0037] The speaker 10 is attached to an object by fixing the outer cylindrical portion 21 to the object. The object may be, for example, a side door of an automobile. The outer cylindrical portion 21 is formed with a connector portion 21A. The inner support portion 22 supports the first drive unit 30.

[0038] (First driving unit 30) As shown in Figures 1 and 2, the first driving unit 30 includes a first magnetic circuit 31 that forms a first magnetic gap 31A, a first coil 32 that is arranged in the first magnetic gap 31A, a first bobbin 33 on which the first coil 32 is provided, a first damper 34, a diaphragm 35, a cap 36, and an edge 37.

[0039] The first magnetic circuit 31 is disposed so that the first magnetic gap 31A is open toward one axial side. The first bobbin 33 has a cylindrical shape. The first coil 32 is provided on the outer peripheral surface of the other axial end of the first bobbin 33.

[0040] The first damper 34 elastically supports the first bobbin 33 so as to be displaceable in the axial direction. The first damper 34 is composed of a single elastic body 34A. The elastic body 34A has a circular hole in the center and is an annular disk-shaped elastic body extending radially outward from the inner edge forming the circular hole, and has a corrugated shape. The outer edge of the elastic body 34A is joined to the first frame 20, and the inner edge of the elastic body 34A is joined to the outer peripheral surface of the first bobbin 33.

[0041] The diaphragm 35 has a circular hole in the center and extends radially outward and axially to one side from the inner edge that defines the circular hole. The inner edge of the diaphragm 35 is joined to the outer peripheral surface of the first bobbin 33. The outer edge of the diaphragm 35 is connected to the first frame 20 by an edge 37. The cap 36 covers the first bobbin 33 from one axial side. The outer edge of the cap 36 is joined to one axial side surface of the diaphragm 35.

[0042] In the first driving unit 30, the magnetic field generated by the first coil 32 and the magnetic field of the first magnetic gap 31A act to vibrate the first bobbin 33, which is elastically supported so as to be displaceable relative to the first frame 20. As a result, the diaphragm 35 and the cap 36 vibrate, producing sound.

[0043] Next, the first magnetic circuit 31 will be described in detail with reference to FIG.

[0044] The first magnetic circuit 31 includes a first magnet 51 and first magnetic members 52 and 53 .

[0045] The first magnet 51 is a ring-shaped magnet.

[0046] The first magnetic members 52, 53 include a first outer magnetic member 52 that forms the radially outer surface of the first magnetic gap 31A, and a first inner magnetic member 53 that forms the radially inner surface of the first magnetic gap 31A.

[0047] The first outer magnetic member 52 has a one-side plate-shaped portion 52A that is disposed on one axial side of the first magnet 51. The one-side plate-shaped portion 52A has a ring shape. The inner peripheral surface of the one-side plate-shaped portion 52A functions as the radially outer surface of the first magnetic gap 31A.

[0048] The first inner magnetic member 53 has an other-side plate-shaped portion 53A and a cylindrical portion 53B. The other-side plate-shaped portion 53A is disposed on the other axial side of the first magnet 51. The other-side plate-shaped portion 53A has a ring shape. The cylindrical portion 53B has a cylindrical shape extending from the inner edge of the other-side plate-shaped portion 53A to one axial side. The outer peripheral surface at one axial end of the cylindrical portion 53B functions as the radially inner surface of the first magnetic gap 31A. The other-side plate-shaped portion 53A and the cylindrical portion 53B are integrally formed.

[0049] An inner space 55 is formed inside the cylindrical portion 53B. No other components of the first magnetic circuit 31 are disposed in the inner space 55. Therefore, as shown in FIG. 2 , the inner space 55 is formed in the first magnetic circuit 31.

[0050] The outer diameter of the first magnet 51 is larger than the outer diameter of the first outer magnetic member 52 and larger than the outer diameter of the first inner magnetic member 53. The inner diameter of the first magnet 51 is larger than the inner diameter of the first outer magnetic member 52. The thickness (axial dimension) of the first magnet 51 is larger than the thickness of the one-side plate-shaped portion 52A and larger than the thickness of the other-side plate-shaped portion 53A.

[0051] (Actuator 40) Next, the actuator 40 (second driving unit) will be described in detail with reference to FIG.

[0052] The actuator 40 comprises a second magnetic circuit 41 that forms a second magnetic gap 41A, a second coil 42 that is arranged in the second magnetic gap 41A, a second bobbin 43 on which the second coil 42 is provided, a second damper 44 that elastically supports the second magnetic circuit 41, and a second frame 45 that holds these.

[0053] The second bobbin 43 is fixed to the second frame 45. Meanwhile, the second magnetic circuit 41 is elastically supported by the second damper 44 so as to be displaceable in the axial direction relative to the second frame 45. The second magnetic circuit 41 vibrates relative to the second frame 45 due to the interaction between the magnetic field generated by the second coil 42 and the magnetic field of the second magnetic gap 41A. That is, in the actuator 40, the second magnetic circuit 41 functions as a mover. The excitation force of the actuator 40 generated thereby cancels out the vibration of the entire speaker 10 caused by the first drive unit 30.

[0054] The second magnetic circuit 41 includes a second magnet 61 and second magnetic members 62 and 63 .

[0055] The second magnet 61 has a cylindrical shape.

[0056] The second magnetic members 62, 63 include a second outer magnetic member 62 that forms the radially outer surface of the second magnetic gap 41A, and a second inner magnetic member 63 that forms the radially inner surface of the second magnetic gap 41A.

[0057] The second outer magnetic member 62 has a second bottom portion 62A and a second cylindrical portion 62B.

[0058] The second bottom portion 62A has a joining surface 62A1 to which the second magnet 61 is joined. An inner recess 62A2 extending in an annular shape is formed radially outward from the joining surface 62A1. The inner recess 62A2 is recessed toward one axial side from the joining surface 62A1. Furthermore, an outer recess 62A3 recessed toward the other axial side is formed on the surface on one axial side of the second bottom portion 62A.

[0059] The second inner magnetic member 63 has a generally cylindrical shape. The outer peripheral surface of the second inner magnetic member 63 faces radially the inner peripheral surface of the second cylindrical portion 62B of the second outer magnetic member 62. A second magnetic gap 41A is formed between the outer peripheral surface of the second inner magnetic member 63 and the inner peripheral surface of the second cylindrical portion 62B of the second outer magnetic member 62.

[0060] The second bobbin 43 has a cylindrical shape. The second coil 42 is provided on the outer peripheral surface of one axial end of the second bobbin 43. The outer peripheral surface of the other axial end of the second bobbin 43 is joined to the second frame 45 with an adhesive or the like (not shown). A portion of the other axial end of the second bobbin 43 protrudes outward through a circular hole 73 provided in the second frame 45. A second cap 46 is attached to the other axial end of the second bobbin 43. The second cap 46 prevents foreign matter from entering the inside of the second bobbin 43.

[0061] The second damper 44 is composed of a first elastic body 44A and an second elastic body 44B.

[0062] The one-side elastic body 44A is joined to a surface on one axial side of the second outer magnetic member 62 of the second magnetic circuit 41. As a result, the one-side elastic body 44A supports the second magnetic circuit 41 from one axial side.

[0063] The other-side elastic body 44B is joined to a surface on the other axial side of the second cylindrical portion 62B of the second outer magnetic member 62 of the second magnetic circuit 41. As a result, the other-side elastic body 44B supports the second magnetic circuit 41 from the other axial side.

[0064] The second frame 45 is made of, for example, synthetic resin. The second frame 45 has a first member 45A and a second member 45B. The second frame 45 has a structure that houses the second magnetic circuit 41, the second damper 44, etc. In other words, the second frame 45 functions as an exterior of the actuator 40.

[0065] The one-side member 45A has a damper joint surface 71 to which the outer edge of the one-side elastic body 44A is joined. The damper joint surface 71 faces the other axial side. The second frame 45 holds the outer edge of the other-side elastic body 44B while sandwiching it between the one-side member 45A and the other-side member 45B. In this manner, the second frame 45 holds the radially outer ends of the one-side elastic body 44A and the other-side elastic body 44B of the second damper 44. Hereinafter, the second frame 45 may be referred to as the holding member 45.

[0066] The one-side member 45A has a plurality of ventilation holes 72A, 72B that connect the inside and outside of the second frame 45. The plurality of ventilation holes 72A, 72B are composed of a plurality of one-side ventilation holes 72A on one axial side of the one-side elastic body 44A and a plurality of other-side ventilation holes 72B on the other axial side of the one-side elastic body 44A. The plurality of one-side ventilation holes 72A are arranged in a row in the circumferential direction, and the plurality of other-side ventilation holes 72B are also arranged in a row in the circumferential direction.

[0067] The other-side member 45B forms a space on the other axial side of the other-side elastic body 44B within the internal space of the second frame 45. The other-side member 45B does not have an air hole connecting the inside and outside of the second frame 45. This prevents foreign matter from entering the inside of the second frame 45 from the other axial side of the speaker 10. As shown in FIG. 1 , the other-side member 45B is exposed to the space on the other axial side of the first magnetic circuit 31. Hereinafter, the other-side member 45B may be referred to as the other-side portion 45B.

[0068] The actuator 40 is disposed in the inner space 55 (see FIG. 2) of the first magnetic circuit 31 in an assembled state (see FIG. 3) of the second frame 45, second damper 44, second bobbin 43, second coil 42, second magnetic circuit 41, and the like that constitute the actuator 40, and is fixed to the first magnetic circuit 31. There are no particular limitations on the method of fixing the actuator 40 to the first magnetic circuit 31.

[0069] <Operation and Effect> Next, the operation and effect of this embodiment will be described.

[0070] In this embodiment, as shown in FIG. 1, the speaker 10 includes a first drive unit 30 and a second drive unit 40 for emitting sound toward one axial side.

[0071] Since the speaker 10 includes the second drive unit 40, the speaker 10 requires a space for arranging the second drive unit 40. If the first drive unit 30 and the second drive unit 40 were simply arranged side by side in the axial direction, the speaker 10 would become large in size in the axial direction. Therefore, in this embodiment, as shown in FIG. 1 , at least a portion of the second drive unit 40 is arranged in the inner space of the first bobbin 33 in the inactive state. This makes it easy to realize a speaker 10 that is small in size in the axial direction.

[0072] 1, in the inactive state, at least a portion of the second magnetic circuit 41 is disposed in the inner space of the first bobbin 33. This makes it easier to realize a speaker 10 that is even smaller in size in the axial direction.

[0073] 3, the second magnetic circuit 41 functions as a mover of the second drive unit 40. Therefore, a high excitation force of the second drive unit 40 can be easily achieved.

[0074] In this embodiment, the first magnetic circuit 31 and the second magnetic circuit 41 are formed as separate bodies. Here, as shown in FIG. 2 , the first magnetic circuit 31 has an inner space 55 located radially inward of the first magnetic gap 31A. At least a portion of the second drive unit 40 is disposed in the inner space 55. Therefore, when the first magnetic circuit 31 and the second magnetic circuit 41 are formed as separate bodies, it is possible to realize a speaker 10 that is small in size in the axial direction.

[0075] In this embodiment, as shown in FIG. 2 , the inner space 55 is a space that is open to one axial side and the other axial side of the first magnetic circuit 31. This makes it even easier to reduce the size of the speaker 10 in the axial direction. In particular, since the inner space 55 is open to the other axial side, the actuator 40 can be inserted from the other axial side, facilitating manufacturing. Furthermore, since the inner space 55 is open to one axial side, the actuator 40 can be disposed so that a portion of it protrudes from the inner space 55 to one axial side. This allows the inner space of the first bobbin 33 to be effectively utilized.

[0076] In the present embodiment, the first magnet 51 of the first magnetic circuit 31 is positioned radially outward of the first magnetic gap 31A, which makes it easy to increase the cross-sectional area of ​​the first magnet 51 while maintaining the size of the inner space 55 of the first magnetic circuit 31.

[0077] 3, the second magnetic circuit 41 is oriented such that the second magnetic gap 41A is open to the other axial side, which makes it easier to wire the second coil 42 to the connector portion 21A.

[0078] 3 , the holding member 45 accommodates the second damper 44 and the movable element 41 therein. Therefore, the holding member 45 can protect the second damper 44 and the movable element 41.

[0079] 3, the holding member 45 has at least one ventilation hole 72A, 72B connecting the inside and outside of the holding member 45. This prevents gas inside the holding member 45 from interfering with the driving of the second driving unit 40.

[0080] 1 and 3, the holding member 45 has a second side portion 45B that is exposed to the space on the other axial side of the first magnetic circuit 31. The second side portion 45B does not have any ventilation holes. This prevents foreign matter from entering the speaker through the ventilation holes.

[0081] <Modification> Next, a modification will be described with reference to FIG.

[0082] The speaker 110 of this modified example differs from the speaker 10 of the above embodiment mainly in the structure of the actuator. The actuator 140 provided in the speaker 110 of this modified example will be described below. Note that components similar to those in the above embodiment will be assigned the same reference numerals and descriptions thereof will be omitted.

[0083] (Actuator 140) As shown in FIG. 4, the actuator 140 includes a second magnetic circuit 41 that forms a second magnetic gap 41A, a second coil 42 that is arranged in the second magnetic gap 41A, a second bobbin 43 on which the second coil 42 is provided, a second damper 44 that elastically supports the second magnetic circuit 41, a second frame 145, and a spacer 47.

[0084] The spacer 47 is composed of a one-side connecting member 47A and a other-side connecting member 47B. The one-side connecting member 47A axially connects the second outer magnetic member 62 of the second magnetic circuit 41 to the one-side elastic body 44A. The other-side connecting member 47B axially connects the second inner magnetic member 63 of the second magnetic circuit 41 to the other-side elastic body 44B.

[0085] As a result, the joint position between the one-side elastic body 44A and the one-side connecting member 47A is located on one axial side of the second magnetic circuit 41. Furthermore, the joint position between the other-side elastic body 44B and the other-side connecting member 47B is located on the other axial side of the second magnetic circuit 41. In other words, by using the spacer 47, the support positions of the one-side elastic body 44A and the other-side elastic body 44B with respect to the mover are shifted outward in the axial direction. Therefore, the positions of the inner edge portions of the one-side elastic body 44A and the other-side elastic body 44B can be set closer to the radial inside. As a result, the radial dimensions of the actuator 140 can be reduced while ensuring the radial dimensions of the one-side elastic body 44A and the other-side elastic body 44B.

[0086] The second frame 145 accommodates therein the second magnetic circuit 41, the second coil 42, the second bobbin 43, and the second damper 44. The second frame 145 is composed of a one-side member 45A, an intermediate member 45C, and an other-side member 45B.

[0087] The one-side member 45A supports the outer edge of the one-side elastic body 44A. The one-side member 45A has a one-side ventilation hole 72A and a second-side ventilation hole 72B. The one-side ventilation hole 72A penetrates the one-side member 45A in the axial direction. One one-side ventilation hole 72A is provided. A plurality of the second-side ventilation holes 72B are formed in the side wall portion of the one-side member 45A. A plurality of the second-side ventilation holes 72B are provided and lined up in the circumferential direction.

[0088] The intermediate member 45C supports the outer peripheral surface of the second bobbin 43. The outer edge of the other-side elastic body 44B is supported in a state where it is sandwiched between the intermediate member 45C and the other-side member 45B.

[0089] The other-side member 45B has a flange 45B1. The flange 45B1 is disposed on the other axial side of the other axial side surface of the first inner magnetic member 53 of the first magnetic circuit 31. The other-side member 45B does not have an air hole connecting the inside and outside of the second frame 45. This prevents foreign matter from entering the inside of the second frame 45 from the other axial side of the speaker 10.

[0090] <Operation and Effect> Next, the operation and effect of the modified example will be described.

[0091] In this modification, as shown in Fig. 4 , the second drive unit 140 includes a spacer 47 that axially couples the second magnetic circuit 41 and the second damper 44. Therefore, compared to when the second damper 44 is directly fixed to the second magnetic circuit 41 (e.g., the first embodiment, see Fig. 3 ), the second damper 44 can be retracted axially outward with respect to the second magnetic circuit 41. This increases the degree of freedom in the shape of the second damper 44, and allows, for example, the second drive unit 140 to be made smaller (e.g., smaller in the radial direction) while maintaining the performance of the second damper 44.

[0092] Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments.

[0093] REFERENCE SIGNS LIST 10 Speaker 30 First driving unit 31 First magnetic circuit 31A First magnetic gap 32 First coil 33 First bobbin 40 Actuator (second driving unit) 41 Second magnetic circuit (movable element) 41A Second magnetic gap 42 Second coil 43 Second bobbin 44 Second damper 44A One side elastic body 44B Other side elastic body 45 Second frame (holding member) 45A One side member 45B Other side member (other side portion) 47 Spacer 47A One side connecting member 47B Other side connecting member 51 First magnet 52 First outer magnetic member (first magnetic member) 52A One side plate-shaped portion 53 First inner magnetic member (first magnetic member) 53A Other side plate-shaped portion 53B Cylindrical portion 55 Inner space 61 Second magnet 62 Second outer magnetic member (second magnetic member) 62A Second bottom 62B Second cylindrical portion 63 Second inner magnetic member (second magnetic member) 72A One side ventilation hole (ventilation hole) 72B Other side ventilation hole (ventilation hole) 110 Speaker 140 Actuator (second driving portion) 145 Second frame (holding member)

Claims

1. A speaker comprising: a first driving unit for emitting sound toward one axial side; and a second driving unit, wherein the first driving unit comprises: a first magnetic circuit forming a first magnetic gap, a first coil arranged in the first magnetic gap, and a first bobbin on which the first coil is provided; and the second driving unit comprises: a second magnetic circuit forming a second magnetic gap, and a second coil arranged in the second magnetic gap, wherein at least a portion of the second driving unit is arranged in the inner space of the first bobbin in a non-operating state.

2. The speaker according to claim 1, wherein the second magnetic circuit functions as a mover of the second driving section.

3. The speaker as described in claim 1, wherein the first magnetic circuit and the second magnetic circuit are formed as separate bodies, the first magnetic circuit has an inner space located radially inward from the first magnetic gap, and at least a portion of the second driving section is disposed in the inner space of the first magnetic circuit.

4. The speaker according to claim 3, wherein the inner space of the first magnetic circuit is a space that is open to one axial side and the other axial side of the first magnetic circuit.

5. The speaker according to claim 1, wherein the first magnetic circuit includes a first magnet, and the first magnet is positioned radially outboard of the first magnetic gap.

6. The speaker according to claim 1, wherein the second magnetic circuit is oriented so that the second magnetic gap is open to the other axial side.

7. A speaker as described in claim 1, wherein the second driving section comprises: a second damper that elastically supports a movable element; and a holding member that holds the second damper, and the holding member houses the second damper and the movable element therein.

8. The speaker according to claim 7, wherein the holding member has at least one ventilation hole connecting the inside and the outside of the holding member.

9. The speaker according to claim 8, wherein the retaining member has a second side portion exposed to a space on the other axial side of the first magnetic circuit, and the second side portion does not have the air hole.

10. The speaker according to claim 1, wherein the second driving section is a driving section for canceling out vibration of the entire speaker caused by the first driving section.

11. A speaker as described in claim 1, wherein the second driving unit comprises: the second magnetic circuit functioning as a mover; a second damper that elastically supports the second magnetic circuit; and a spacer that axially connects the second magnetic circuit and the second damper.

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