Speaker

Abstract

To provide a speaker having a first driving unit and a second driving unit, which is small in size in the axial direction.SOLUTION: A speaker 10 includes a first driving unit 30 for emitting sound toward one axial direction, and a second driving unit 40. In a non-operating state, at least a portion of the second driving unit 40 is disposed in the inner space of a first bobbin 33.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a speaker.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present disclosure is to provide a speaker including a first driving unit and a second driving unit, which is small in the axial direction.

Means for Solving the Problems

[0005] The speaker according to the first aspect is a speaker including a first driving unit for emitting sound toward one side in the axial direction and a second driving unit, wherein the first driving unit includes a first magnetic circuit forming a first magnetic gap, a first coil disposed in the first magnetic gap, and a first bobbin provided with the first coil, the second driving unit includes a second magnetic circuit forming a second magnetic gap and a second coil disposed in the second magnetic gap, and in a non-operating state, at least a part of the second driving unit is disposed in the inner space of the first bobbin.

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

[0007] By the way, since the speaker includes the second driving unit, a space for arranging the second driving unit is required in the speaker. Here, if the first driving unit and the second driving unit are simply arranged side by side in the axial direction, the speaker will be enlarged in the axial direction (height direction). Therefore, in this aspect, in the non-operating state, at least a part of the second driving unit is arranged in the inner space of the first bobbin. For this reason, it is easy to realize a speaker that is miniaturized in the axial direction.

[0008] In the embodiment described later, the second driving unit is a driving unit for canceling the vibration of the entire speaker by the first driving unit, but the second driving unit of this aspect is not limited to this. The second driving unit of this aspect may be, for example, a driving unit for emitting high-range sound, or a driving unit for other functions. Also, in the embodiment described later, the second magnetic circuit is formed as a separate body from the first magnetic circuit, but the second magnetic circuit of this aspect is not limited to this. Also, in the embodiment described later, the second magnetic circuit functions as a mover of the second driving unit, but the second magnetic circuit of this aspect is not limited to this. Also, in the embodiment described later, in the non-operating state, at least a part of the second magnetic circuit is arranged in the inner space of the first bobbin, but this aspect is not limited to this.

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

[0010] In this aspect, the second magnetic circuit functions as a mover of the second driving unit. For this reason, a high exciting force of the second driving unit can be easily realized.

[0011] In the speaker according to the third aspect, in the first or second aspect, the first magnetic circuit and the second magnetic circuit are formed as separate bodies, the first magnetic circuit has an inner space located radially inside the first magnetic gap, and at least a part 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 inside the first magnetic gap. And at least a part of the second driving unit is disposed in the inner space of the first magnetic circuit. Therefore, when the first magnetic circuit and the second magnetic circuit are formed as separate bodies, a speaker that is miniaturized in the axial direction can be realized.

[0013] The speaker according to the 4th aspect is, in the 3rd aspect, the inner space of the first magnetic circuit is a space opened on one axial side and the other axial side of the first magnetic circuit.

[0014] In this aspect, the inner space of the first magnetic circuit is a space opened on one axial side and the other axial side of the first magnetic circuit. Therefore, it is even easier to miniaturize the speaker in the axial direction.

[0015] The speaker according to the 5th aspect is, in any of the 1st to 4th aspects, the first magnetic circuit includes a first magnet, and the first magnet is located radially outside the first magnetic gap.

[0016] In this aspect, the first magnet of the first magnetic circuit is located radially outside the first magnetic gap. Therefore, it is easy to increase the cross-sectional area of the magnet while securing the size of the inner space of the first magnetic circuit.

[0017] The speaker according to the 6th aspect is, in any of the 1st to 5th aspects, the second magnetic circuit is arranged in such a direction that the second magnetic gap is opened on the other axial side.

[0018] In this aspect, the second magnetic circuit is arranged in such a direction that the second magnetic gap is opened on the other axial side. Therefore, wiring from the second coil is easy.

[0019] The speaker according to the seventh aspect, in any one of the first to sixth aspects, the second driving unit includes a second damper that elastically supports the mover, and a holding member that holds the second damper, and the holding member houses the second damper and the mover therein.

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

[0021] The speaker according to the eighth aspect, in the seventh aspect, the holding member has at least one vent hole that connects the inside and the outside of the holding member.

[0022] In this aspect, the holding member has at least one vent hole that connects the inside and the outside of the holding member. Therefore, it is possible to prevent the gas inside the holding member from inhibiting the driving of the second driving unit.

[0023] The speaker according to the ninth aspect, in the eighth aspect, the holding member has an other side portion that is exposed to the space on the other axial side with respect to the first magnetic circuit, and the other side portion does not have the vent hole.

[0024] In this aspect, the holding member has an other side portion that is exposed to the space on the other axial side with respect to the first magnetic circuit. And the other side portion does not have the vent hole. Therefore, it is possible to prevent foreign matter from entering the speaker through the vent hole.

[0025] The speaker according to the tenth aspect, in any one of the first to ninth aspects, the second driving unit is a driving unit for canceling the vibration of the entire speaker by the first driving unit.

[0026] In this aspect, the second driving unit is a driving unit for canceling the vibration of the entire speaker by the first driving unit. Therefore, a speaker with reduced vibration can be realized.

[0027] In the speaker according to the eleventh aspect, in any one of the first to tenth aspects, 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 driving unit includes a spacer that axially connects the second magnetic circuit and the second damper. Therefore, compared with the case where the second damper is directly fixed to the second magnetic circuit, the second damper can be retracted axially outward with respect to the second magnetic circuit. Therefore, the degree of freedom in the shape of the second damper increases, and for example, the second driving unit can be miniaturized (for example, miniaturized in the radial direction) while ensuring the performance of the second damper.

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

Advantages of the Invention

[0030] According to the present disclosure, a speaker including a first driving unit and a second driving unit can provide an axially compact speaker.

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0032] With reference to FIGS. 1 to 3, the speaker 10 according to the embodiment will be described.

[0033] As shown in FIG. 1, the speaker 10 of the present embodiment includes a first frame 20 formed of, for example, a synthetic resin, a first drive unit 30 for emitting sound toward one side in the axial direction, and an actuator 40 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 for canceling the vibration of the entire speaker 10 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 the 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 opened on both sides in the axial direction. As shown in FIG. 1, the actuator 40 is disposed in this inner space 55.

[0035] Hereinafter, each component will be described.

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

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

[0038] (First Drive Unit 30) As shown in FIGS. 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 disposed 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 arranged such that the first magnetic gap 31A is open toward one side in the axial direction. The first bobbin 33 has a cylindrical shape. The first coil 32 is provided on the outer peripheral surface side at the other end in the axial direction 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 elastic body having an annular disc shape extending radially outward from the inner edge portion forming the circular hole, and has a corrugated shape. The outer edge portion of the elastic body 34A is joined to the first frame 20, and the inner edge portion 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 has a shape extending radially outward and toward one side in the axial direction from the inner edge portion forming the circular hole. The inner edge portion of the diaphragm 35 is joined to the outer peripheral surface of the first bobbin 33. The outer edge portion of the diaphragm 35 is connected to the first frame 20 by the edge 37. The cap 36 covers the first bobbin 33 from one side in the axial direction. The outer edge portion of the cap 36 is joined to one side surface in the axial direction of the diaphragm 35.

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

[0043] Next, with reference to FIG. 2, the first magnetic circuit 31 will be described in detail.

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

[0047] The first outer magnetic member 52 has a one-side plate-shaped portion 52A 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 axially on one side from the inner edge portion of the other-side plate-shaped portion 53A. 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 arranged 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, with reference to FIG. 3, the actuator 40 (second driving unit) will be described in detail.

[0052] The actuator 40 includes a second magnetic circuit 41 that forms a second magnetic gap 41A, a second coil 42 disposed 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 components.

[0053] The second bobbin 43 is fixed to the second frame 45. On the other hand, the second magnetic circuit 41 is elastically supported by the second damper 44 so as to be axially displaceable with respect to the second frame 45. Then, due to the action of the magnetic field generated by the second coil 42 and the magnetic field of the second magnetic gap 41A, the second magnetic circuit 41 vibrates with respect to the second frame 45. That is, in the actuator 40, the second magnetic circuit 41 functions as a mover. The exciting force of the actuator 40 generated thereby cancels out the vibration of the entire speaker 10 by the first driving unit 30.

[0054] The second magnetic circuit 41 has a second magnet 61 and second magnetic members 62, 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 62A has a joint surface 62A1 to which the second magnet 61 is joined. An inner concave portion 62A2 extending in an annular shape is formed on the radially outer side with respect to the joint surface 62A1. The inner concave portion 62A2 is recessed on one axial side with respect to the joint surface 62A1. Further, an outer concave portion 62A3 that is recessed on the other axial side is formed on one axial side surface of the second bottom 62A.

[0059] The second inner magnetic member 63 generally has a cylindrical shape. The outer peripheral surface of the second inner magnetic member 63 faces the inner peripheral surface of the second cylindrical portion 62B of the second outer magnetic member 62 in the radial direction. 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 side at 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 by an adhesive or the like (not shown). A part of the other axial side of the second bobbin 43 protrudes outward from 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 one-side elastic body 44A and an other-side elastic body 44B.

[0062] The one-side elastic body 44A is joined to the one axial side surface of the second outer magnetic member 62 of the second magnetic circuit 41. Thereby, 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 the other axial side surface of the second cylindrical portion 62B of the second outer magnetic member 62 of the second magnetic circuit 41. Thereby, the other-side elastic body 44B supports the second magnetic circuit 41 from the other axial side.

[0064] The second frame 45 is formed of, for example, a synthetic resin. The second frame 45 has one side member 45A and the other side member 45B. The second frame 45 has a structure for accommodating the second magnetic circuit 41, the second damper 44, etc. inside. That is, 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 is a surface facing the other side in the axial direction. Also, the second frame 45 holds the outer edge of the other side elastic body 44B in a sandwiched state between the one side member 45A and the other side member 45B. In this way, the second frame 45 holds the radially outer end portions 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 a holding member 45.

[0066] The one side member 45A has a plurality of ventilation holes 72A, 72B that connect the inside and the 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 the one side in the axial direction with respect to the one side elastic body 44A and a plurality of the other side ventilation holes 72B on the other side in the axial direction with respect to the one side elastic body 44A. The plurality of one side ventilation holes 72A are provided so as to be arranged in the circumferential direction, and the plurality of the other side ventilation holes 72B are also provided so as to be arranged in the circumferential direction.

[0067] The other side member 45B forms a space on the other side in the axial direction with respect to the other side elastic body 44B in the internal space of the second frame 45. The other side member 45B does not have a ventilation hole that connects the inside and the outside of the second frame 45. Thereby, it is possible to prevent foreign matter from entering the inside of the second frame 45 from the other side in the axial direction with respect to the speaker 10. As shown in FIG. 1, the other side member 45B is exposed in a space on the other side in the axial direction with respect to the first magnetic circuit 31. Hereinafter, the other side member 45B may be referred to as the other side part 45B.

[0068] The actuator 40 is arranged in the inner space 55 (see FIG. 2) of the first magnetic circuit 31 and fixed to the first magnetic circuit 31 in a state where the second frame 45, the second damper 44, the second bobbin 43, the second coil 42, the second magnetic circuit 41, etc. constituting the actuator 40 are assembled (see FIG. 3). The fixing method of the actuator 40 to the first magnetic circuit 31 is not particularly limited.

[0069] <Operational effects> Next, the operational effects of this embodiment will be described.

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

[0071] By the way, since the speaker 10 includes the second drive unit 40, the speaker 10 requires a space for arranging the second drive unit 40. Here, if the first drive unit 30 and the second drive unit 40 are simply arranged side by side in the axial direction, the speaker 10 will become large in the axial direction. Therefore, in this embodiment, as shown in FIG. 1, in the non-operating state, at least a part of the second drive unit 40 is arranged in the inner space of the first bobbin 33. For this reason, it is easy to realize a speaker 10 that is miniaturized in the axial direction.

[0072] In particular, in this embodiment, as shown in FIG. 1, in the non-operating state, at least a part of the second magnetic circuit 41 is arranged in the inner space of the first bobbin 33. For this reason, it is even easier to realize a speaker 10 that is miniaturized in the axial direction.

[0073] Also, in this embodiment, as shown in FIG. 3, the second magnetic circuit 41 functions as a mover of the second drive unit 40. For this reason, a high vibration force of the second drive unit 40 can be easily realized.

[0074] Also, in the present 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. And at least a part 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, the speaker 10 can be miniaturized in the axial direction.

[0075] Also, in the present embodiment, as shown in FIG. 2, the inner space 55 is a space opened on one axial side and the other axial side of the first magnetic circuit 31. Therefore, it is even easier to miniaturize the speaker 10 in the axial direction. In particular, since the inner space 55 is open to the other axial side and the actuator 40 can be inserted from the other axial side, the manufacturing is easy. Also, since the inner space 55 is open to one axial side, a part of the actuator 40 can be arranged to protrude from the inner space 55 to one axial side. Therefore, the inner space of the first bobbin 33 can be effectively utilized.

[0076] Also, in the present embodiment, the first magnet 51 of the first magnetic circuit 31 is located radially outside the first magnetic gap 31A. Therefore, it is easy to increase the cross-sectional area of the first magnet 51 while securing the size of the inner space 55 of the first magnetic circuit 31.

[0077] Also, in the present embodiment, as shown in FIG. 3, the second magnetic circuit 41 is arranged such that the second magnetic gap 41A is open to the other axial side. Therefore, it is easy to wire from the second coil 42 to the connector portion 21A.

[0078] Also, in the present embodiment, as shown in FIG. 3, the holding member 45 houses the second damper 44 and the mover 41 inside. Therefore, the holding member 45 can protect the second damper 44 and the mover 41.

[0079] Also, in the present embodiment, as shown in FIG. 3, the holding member 45 has at least one vent hole 72A, 72B that connects the inside and the outside of the holding member 45. Therefore, it is possible to prevent the gas inside the holding member 45 from inhibiting the driving of the second driving unit 40.

[0080] Also, in the present embodiment, as shown in FIGS. 1 and 3, the holding member 45 has the other side portion 45B that is exposed to the space on the other axial side with respect to the first magnetic circuit 31. And the other side portion 45B does not have a vent hole. Therefore, it is possible to prevent foreign matter from entering the speaker through the vent hole.

[0081] <Modification Example> Next, with reference to FIG. 4, a modification example will be described.

[0082] The difference between the speaker 110 of the modification example and the speaker 10 of the above embodiment is mainly the structure of the actuator. Hereinafter, the actuator 140 included in the speaker 110 of the modification example will be described. Note that the same components as those in the above embodiment are denoted by the same reference numerals and the description 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 disposed in the second magnetic gap 41A, a second bobbin 43 provided with the second coil 42, 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 an 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 and 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 and the other - side elastic body 44B.

[0085] As a result, the joining position between the one - side elastic body 44A and the one - side connecting member 47A is located on the one - side in the axial direction with respect to the second magnetic circuit 41. Also, the joining position between the other - side elastic body 44B and the other - side connecting member 47B is located on the other - side in the axial direction with respect to the second magnetic circuit 41. That is, by using the spacer 47, the support positions of the movable element by the one - side elastic body 44A and the other - side elastic body 44B are retracted to the outside 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 inside in the radial direction. As a result, while securing the radial dimensions of the one - side elastic body 44A and the other - side elastic body 44B, the radial dimension of the actuator 140 can be reduced.

[0086] The second frame 145 houses the second magnetic circuit 41, the second coil 42, the second bobbin 43, and the second damper 44 inside. 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 portion of the one - side elastic body 44A. The one - side member 45A has a one - side vent hole 72A and an other - side vent hole 72B. The one - side vent hole 72A penetrates the one - side member 45A in the axial direction. One one - side vent hole 72A is provided. A plurality of the other - side vent holes 72B are formed in the side wall portion of the one - side member 45A. A plurality of the other - side vent holes 72B are provided side by side in the circumferential direction.

[0088] The intermediate member 45C supports the second bobbin 43 from the outer peripheral surface side. The outer edge portion of the other - side elastic body 44B is supported in a state of being 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 arranged on the other - side in the axial direction with respect to the other - side surface in the axial direction of the first inner magnetic member 53 of the first magnetic circuit 31. The other - side member 45B does not have a vent hole connecting the inside and the outside of the second frame 45. Thereby, it is possible to prevent foreign matter from entering the inside of the second frame 45 from the other - side in the axial direction with respect to the speaker 10.

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

[0091] In the modified example, as shown in FIG. 4, the second drive unit 140 includes a spacer 47 that axially connects the second magnetic circuit 41 and the second damper 44. Therefore, compared with the case where the second damper 44 is directly fixed to the second magnetic circuit 41 (see the first embodiment, FIG. 3), the second damper 44 can be retracted axially outward with respect to the second magnetic circuit 41. Therefore, the degree of freedom in the shape of the second damper 44 increases, and for example, the second drive unit 140 can be miniaturized (for example, miniaturized in the radial direction) while ensuring the performance of the second damper 44.

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

Description of Reference Numerals

[0093] 10 Speaker 30 First Drive Unit 31 First Magnetic Circuit 31A First Magnetic Gap 32 First Coil 33 First Bobbin 40 Actuator (Second Drive 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 part 53 First inner magnetic member (first magnetic member) 53A The other-side plate-shaped part 53B Cylindrical part 55 Inner space 61 Second magnet 62 Second outer magnetic member (second magnetic member) 62A Second bottom 62B Second cylindrical part 63 Second inner magnetic member (second magnetic member) 72A One-side ventilation hole (ventilation hole) 72B The other-side ventilation hole (ventilation hole) 110 Speaker 140 Actuator (second drive part) 145 Second frame (holding member)

Claims

1. A first driving unit for emitting sound toward one side in the axial direction, a second driving unit, and a speaker comprising: The first driving unit includes: a first magnetic circuit forming a first magnetic gap; a first coil disposed in the first magnetic gap; and a first bobbin provided with the first coil. The second driving unit includes: a second magnetic circuit forming a second magnetic gap; and a second coil disposed in the second magnetic gap. In a non-operating state, at least a part of the second driving unit is disposed in the inner space of the first bobbin. Speaker.

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

3. The first magnetic circuit and the second magnetic circuit are formed as separate bodies. The first magnetic circuit has an inner space located radially inside the first magnetic gap. At least a part of the second driving unit is disposed in the inner space of the first magnetic circuit. The speaker according to claim 1.

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

5. The first magnetic circuit includes a first magnet. The first magnet is located radially outside the first magnetic gap. The speaker according to claim 1.

6. The second magnetic circuit is arranged in a direction in which the second magnetic gap is open to the other side in the axial direction. The speaker according to claim 1.

7. The second driving 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 inside. The speaker according to claim 1.

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

9. The holding member has an other side portion exposed to the space on the other side in the axial direction with respect to the first magnetic circuit. The other side portion does not have the vent hole. The speaker according to claim 8.

10. The second driving unit is a driving unit for canceling the vibration of the entire speaker by the first driving unit. The speaker according to claim 1.

11. The second driving unit includes: the second magnetic circuit functioning as a mover; and a second damper that elastically supports the second magnetic circuit. ​ ​ A spacer that axially connects the second magnetic circuit and the second damper, and The speaker according to claim 1.

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