Speaker device

Abstract

To provide a speaker device capable of reducing its thickness in a sound emission direction while suppressing vibration.SOLUTION: A speaker device comprises a first magnetic circuit, a second magnetic circuit, a first voice coil, a second voice coil, a first damper, and a second damper. The first magnetic circuit is formed with a first magnetic gap, being provided at the sound emission side. The second magnetic circuit is formed with a second magnetic gap, being provided at a back face side opposite to the sound emission side from the first magnetic circuit. The first voice coil is arranged at the first magnetic gap. The second voice coil is arranged at the second magnetic gap. The first damper supports the second voice coil. The second damper supports the second voice coil while being provided at an inner side from the first damper in a radial direction of the first damper.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technique for suppressing vibration. [Background technology]

[0002] BACKGROUND ART Conventionally, speaker devices having a mechanism for suppressing vibrations that occur when emitting sound are known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-152884 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a mechanism for suppressing vibration is provided in a speaker device, there is a risk that the thickness of the speaker device in the sound output direction will increase.

[0005] The present invention has been made in view of the above, and has an object to provide a speaker device that can reduce the thickness in the sound output direction while suppressing vibrations. [Means for solving the problem]

[0006] A speaker device according to one aspect of the embodiment includes a first magnetic circuit, a second magnetic circuit, a first voice coil, a second voice coil, a first damper, and a second damper. The first magnetic circuit has a first magnetic gap formed therein and is provided on the sound output side. The second magnetic circuit has a second magnetic gap formed therein and is provided on the rear side of the first magnetic circuit in the opposite direction from the sound output side. The first voice coil is disposed in the first magnetic gap. The second voice coil is disposed in the second magnetic gap. The first damper supports the second voice coil. The second damper is disposed radially inward of the first damper and supports the second voice coil. [Effects of the Invention]

[0007] According to one aspect of the embodiment, it is possible to reduce the thickness in the sound output direction while suppressing vibrations. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing an outline of a speaker device according to a first embodiment. [Figure 2] FIG. 2 is a diagram showing an example of directions in which forces are generated by vibrations of the first voice coil and the second voice coil in the speaker device. [Figure 3] FIG. 3 is a cross-sectional view showing an outline of a speaker device according to a comparative example. [Figure 4] FIG. 4 is a cross-sectional view showing an outline of the speaker device according to the second embodiment. [Figure 5] FIG. 5 is a cross-sectional view showing an outline of a speaker device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] The speaker device will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0010] (First embodiment) The speaker device 1 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view showing an outline of the speaker device 1 according to the first embodiment.

[0011] In the following description, the sound output side from which sound is output from the speaker device 1 will be referred to as the front side. Also, the rear side opposite to the sound output side will be referred to as the rear side.

[0012] The speaker device 1 includes a speaker box 2 and a speaker unit 3. The speaker box 2 supports the speaker unit 3. The speaker box 2 houses a portion of the speaker unit 3. The speaker box 2 is open on the front side. The speaker box 2 is provided so as to cover the sides and rear of the speaker unit 3. The speaker box 2 prevents pressure fluctuations on the rear side of the speaker unit 3 from being transmitted to other components provided around the speaker device 1.

[0013] The speaker unit 3 includes a first magnetic circuit 10, a second magnetic circuit 11, a first frame 12, a second frame 13, a first bobbin 14, a first voice coil 15, a second bobbin 16, and a second voice coil 17. The speaker unit 3 also includes a diaphragm 18, a first damper 19, a second damper 20, and a third damper 21.

[0014] The first magnetic circuit 10 includes a magnet 30 , a plate 31 , and a yoke 32 .

[0015] The magnet 30 is formed in a cylindrical shape. The plate 31 is also formed in a cylindrical shape. The plate 31 is provided in front of the magnet 30. The rear end surface of the plate 31 is joined to the front end surface of the magnet 30.

[0016] The yoke 32 includes a bottom plate portion 32a and a pole portion 32b. The bottom plate portion 32a is formed in a circular shape. The bottom plate portion 32a includes a protruding portion 32c that protrudes forward. The protruding portion 32c is formed in a cylindrical shape. The protruding portion 32c is provided at the center of the bottom plate portion 32a in the radial direction of the bottom plate portion 32a. The protruding portion 32c is provided behind the magnet 30. The front end surface of the protruding portion 32c is joined to the rear end surface of the magnet 30.

[0017] The magnet 30 is sandwiched between the protruding portion 32c of the yoke 32 and the plate 31, and is fixed to the protruding portion 32c of the yoke 32 and the plate 31. In the first magnetic circuit 10, the magnet 30, the plate 31, and the yoke 32 are arranged coaxially.

[0018] The pole portion 32b is formed to protrude forward from the bottom plate portion 32a. The pole portion 32b is formed in a cylindrical shape. The inner diameter of the pole portion 32b is larger than the outer diameters of the magnet 30, the plate 31, and the protrusion portion 32c. The front end of the pole portion 32b is fixed to the first frame 12.

[0019] In the first magnetic circuit 10, a first magnetic gap 33 is formed between the plate 31, the magnet 30, and the protruding portion 32c of the yoke 32 and the pole portion 32b of the yoke 32 in the radial direction of the first magnetic circuit 10. The first magnetic gap 33 is formed in an annular shape. The first magnetic gap 33 is formed so that its front end is open.

[0020] The second magnetic circuit 11 is provided behind the first magnetic circuit 10. The second magnetic circuit 11 includes a magnet 40, a plate 41, and a yoke .

[0021] The magnet 40 is formed in a cylindrical shape. The plate 41 is also formed in a cylindrical shape. The plate 41 is provided behind the magnet 40. The front end surface of the plate 41 is joined to the rear end surface of the magnet 40.

[0022] The yoke 42 includes a bottom plate portion 42a and a pole portion 42b. The bottom plate portion 42a is formed in a circular shape. The bottom plate portion 42a is fixed to the bottom plate portion 32a of the yoke 32 of the first magnetic circuit 10. Specifically, the front end surface of the bottom plate portion 42a is joined to the rear end surface of the bottom plate portion 32a of the first magnetic circuit 10. In other words, the first magnetic circuit 10 and the second magnetic circuit 11 are joined and fixed.

[0023] The bottom plate portion 42a includes a protruding portion 42c that protrudes rearward. The protruding portion 42c is formed in a cylindrical shape. The protruding portion 42c is provided at the center of the bottom plate portion 42a in the radial direction of the bottom plate portion 42a. The protruding portion 42c is provided in front of the magnet 40. The rear end surface of the protruding portion 42c is joined to the front end surface of the magnet 40.

[0024] The magnet 40 is sandwiched between the protruding portion 42c of the yoke 42 and the plate 41 and is fixed to the protruding portion 42c of the yoke 42 and the plate 41. In the second magnetic circuit 11, the magnet 40, the plate 41, and the yoke 42 are arranged coaxially. The magnet 40, the plate 41, and the yoke 42 of the second magnetic circuit 11 are arranged coaxially with the magnet 30 of the first magnetic circuit 10, etc.

[0025] The pole portion 42b is formed so as to protrude rearward from the bottom plate portion 42a. The pole portion 42b is formed in a cylindrical shape. The inner diameter of the pole portion 42b is larger than the outer diameters of the magnet 40, the plate 41, and the protrusion portion 42c.

[0026] In the second magnetic circuit 11, a second magnetic gap 43 is formed between the plate 41, the magnet 40, and the protruding portion 42c of the yoke 42 and the pole portion 42b of the yoke 42 in the radial direction of the second magnetic circuit 11. The second magnetic gap 43 is formed in an annular shape. The second magnetic gap 43 is formed so that its rear end is open.

[0027] The first frame 12 includes a main body 50 and an attachment portion 51. The main body 50 is formed in a bowl shape. The main body 50 is formed so that the inner diameter decreases from the front to the rear. A hole 50a is formed at the rear end of the main body 50. The yoke 32 of the first magnetic circuit 10 is fixed around the hole 50a. Specifically, the front end of the pole portion 32b of the yoke 32 is attached and fixed to the rear end of the main body 50. The first frame 12 supports the first magnetic circuit 10.

[0028] The mounting portion 51 is formed so as to protrude radially outward from the outer peripheral surface of the main body portion 50. The mounting portion 51 is attached to the speaker box 2. That is, the speaker unit 3 is attached to the speaker box 2 via the mounting portion 51.

[0029] The second frame 13 is formed in a bowl shape. A hole 13a is formed at the front end of the second frame 13. A part of the second magnetic circuit 11 is inserted into the hole 13a. Specifically, the pole portion 42b of the second magnetic circuit 11 is inserted into the hole 13a. The second frame 13 is attached to the pole portion 42b of the second magnetic circuit 11.

[0030] The first bobbin 14 is formed in a cylindrical shape. A portion of the first bobbin 14 is inserted into a first magnetic gap 33 formed in the first magnetic circuit 10.

[0031] The first voice coil 15 is disposed in the first magnetic gap 33. The first voice coil 15 is wound around the outer peripheral surface of the first bobbin 14. That is, the first voice coil 15 is formed in a cylindrical shape. An audio input signal is supplied to the first voice coil 15 from the outside via a connection terminal or the like.

[0032] The second bobbin 16 is formed in a cylindrical shape. A portion of the second bobbin 16 is inserted into a second magnetic gap 43 formed in the second magnetic circuit 11.

[0033] The second voice coil 17 is disposed in the second magnetic gap 43. The second voice coil 17 is wound around the outer peripheral surface of the second bobbin 16. That is, the second voice coil 17 is formed in a cylindrical shape. An input signal corresponding to an audio input signal is supplied to the second voice coil 17. The input signal is a signal that generates vibrations that cancel out unnecessary vibrations generated by the audio input signal. The input signal includes a signal that generates vibrations that reduce unnecessary vibrations generated by the audio input signal.

[0034] The diaphragm 18 is provided on the front end side of the first frame 12. The diaphragm 18 is formed in a cone shape. The diaphragm 18 is formed so as to be concave from the front to the rear. In other words, the diaphragm 18 is formed so as to have a smaller diameter from the front to the rear. The diaphragm 18 is attached to the main body part 50 of the first frame 12 via an edge 18a. The edge 18a is formed in an annular shape. The edge 18a is provided between the outer peripheral edge of the diaphragm 18 and the main body part 50 of the first frame 12.

[0035] A hole 18b is formed at the rear end of diaphragm 18. Hole 18b is formed in the radial center of diaphragm 18. First bobbin 14 is inserted into hole 18b. Diaphragm 18 is attached to first bobbin 14. The inner peripheral edge of diaphragm 18 is attached to first bobbin 14. The outer peripheral edge of diaphragm 18 is attached to first frame 12 via edge 18a.

[0036] The first damper 19 supports the second voice coil 17. The first damper 19 supports the second voice coil 17 via the second bobbin 16. The first damper 19 is formed in an annular shape. The first damper 19 is provided between the second bobbin 16 and the second frame 13. The inner peripheral end of the first damper 19 is attached to the outer peripheral surface of the second bobbin 16. The outer peripheral end of the first damper 19 is attached to the second frame 13. The first damper 19 supports the second bobbin 16 from the outside in the radial direction of the second bobbin 16.

[0037] At least a portion of the first damper 19 is formed in a bellows shape with repeated concave and convex portions along the radial direction of the first damper 19. The bellows shape is formed over the entire circumferential direction of the first damper 19. In other words, the first damper 19 is formed with concentric waveforms that continue in the radial direction.

[0038] The second damper 20 supports the second voice coil 17. The second damper 20 supports the second voice coil 17 via the second bobbin 16. The second damper 20 is provided radially inward of the first damper 19. The second damper 20 is formed in an annular shape. The second damper 20 is provided between the second bobbin 16 and a support member 60 (rear side support member). The support member 60 is, for example, a resin member. The support member 60 is cylindrical. The support member 60 is provided radially toward the center of the plate 41 of the second magnetic circuit 11. The support member 60 is provided coaxially with the plate 41 of the second magnetic circuit 11. The support member 60 is attached to the plate 41 of the second magnetic circuit 11.

[0039] The inner peripheral end of the second damper 20 is attached to the outer peripheral surface of the support member 60. The outer peripheral end of the second damper 20 is attached to the inner peripheral surface of the second bobbin 16. The second damper 20 supports the second bobbin 16 from the inside in the radial direction of the second bobbin 16.

[0040] At least a portion of the second damper 20 is formed in a bellows shape with repeated concave and convex portions along the radial direction of the second damper 20. The bellows shape is formed over the entire circumferential direction of the second damper 20. In other words, the second damper 20 is formed with concentric waveforms that continue in the radial direction.

[0041] The third damper 21 is provided rearward of the diaphragm 18. The third damper 21 is provided forward of the first magnetic circuit 10. The third damper 21 supports the first voice coil 15. The third damper 21 supports the first voice coil 15 via the first bobbin 14. The third damper 21 is formed in an annular shape. The third damper 21 is provided between the first bobbin 14 and the main body portion 50 of the first frame 12. The inner peripheral end of the third damper 21 is attached to the outer peripheral surface of the first bobbin 14. The outer peripheral end of the third damper 21 is attached to the inner peripheral surface of the main body portion 50 of the first frame 12.

[0042] At least a portion of the third damper 21 is formed in a bellows shape with repeated concave and convex portions along the radial direction of the third damper 21. The bellows shape is formed over the entire circumferential direction of the third damper 21. In other words, the third damper 21 is formed with concentric waveforms that continue in the radial direction.

[0043] In the speaker device 1, when an input audio signal is supplied to the first voice coil 15, the first voice coil 15 vibrates in the sound emission direction in response to the input audio signal due to interaction with the magnetic flux in the first magnetic circuit 10. The vibration of the first voice coil 15 in the sound emission direction vibrates the first bobbin 14. Then, the vibration of the first bobbin 14 is transmitted to the diaphragm 18, and the speaker device 1 emits sound forward from the diaphragm 18.

[0044] In the speaker device 1, the vibration system including the first voice coil 15 and the first bobbin 14 is centered in the radial direction of the first bobbin 14 by the third damper 21. In addition, in the speaker device 1, the third damper 21 damps radial vibrations generated in the first voice coil 15 and the first bobbin 14.

[0045] Vibrations of the first voice coil 15 in the sound output direction are transmitted to the members around the speaker device 1 via the third damper 21, the diaphragm 18, and the first frame 12. The speaker device 1 has a second voice coil 17, a second magnetic circuit 11, etc. to suppress transmission of vibrations of the first voice coil 15 in the sound output direction to the members around the speaker device 1.

[0046] The speaker device 1 generates vibrations in the second voice coil 17 corresponding to the vibrations of the first voice coil 15 in the sound emission direction. For example, as shown in Fig. 2, when vibrations are generated such that the first voice coil 15 moves forward, the speaker device 1 supplies an input signal to the second voice coil 17 so as to generate vibrations such that the second voice coil 17 moves backward. Fig. 2 is a diagram showing an example of directions in which forces are generated by the vibrations of the first voice coil 15 and the second voice coil 17 in the speaker device 1.

[0047] That is, the speaker device 1 vibrates the second voice coil 17 so as to cancel unnecessary vibrations of the first magnetic circuit 10 and the like caused by the vibration of the first voice coil 15 in the sound output direction. The speaker device 1 supplies an input signal to the second voice coil 17 so as to generate vibrations in the opposite direction to the vibration of the first voice coil 15 in the sound output direction. As a result, vibrations in the opposite direction to the vibration of the first voice coil 15 in the sound output direction are transmitted to the first magnetic circuit 10 via the second magnetic circuit 11. Therefore, transmission of vibrations to members around the speaker device 1 is suppressed.

[0048] In the speaker device 1, the second bobbin 16 around which the second voice coil 17 is wound is supported from the outside in the radial direction of the second bobbin 16 by the first damper 19. Furthermore, the second bobbin 16 is supported from the inside in the radial direction of the second bobbin 16 by the second damper 20. In the speaker device 1, the vibration system including the second voice coil 17 and the second bobbin 16 is centered by the first damper 19 and the second damper 20. Furthermore, in the speaker device 1, the first damper 19 and the second damper 20 damp radial vibrations generated in the second voice coil 17 and the second bobbin 16.

[0049] In a speaker device 200 according to a comparative example that does not use the second damper 20 of the embodiment, dampers 200a and 200b are arranged side by side in the front-rear direction as shown in Fig. 3 in order to center the second voice coil 17, etc. Fig. 3 is a cross-sectional view showing an outline of the speaker device 200 according to the comparative example.

[0050] However, in the speaker device 200 according to the comparative example, the dampers 200a and 200b are arranged side by side in the front-rear direction, and therefore the thickness in the front-rear direction, that is, in the sound output direction, is large.

[0051] In contrast, the speaker device 1 according to the embodiment includes a first magnetic circuit 10, a second magnetic circuit 11, a first voice coil 15, a second voice coil 17, a first damper 19, and a second damper 20. The first magnetic circuit 10 has a first magnetic gap 33 formed therein and is provided on the sound output side. The second magnetic circuit 11 has a second magnetic gap 43 formed therein and is provided on the rear side of the first magnetic circuit 10, in the direction opposite to the sound output side. The first voice coil 15 is disposed in the first magnetic gap 33. The second voice coil 17 is disposed in the second magnetic gap 43. The first damper 19 supports the second voice coil 17. The second damper 20 is disposed radially inward of the first damper 19 and supports the second voice coil 17.

[0052] This allows the speaker device 1 to reduce the thickness of the speaker unit 3 in the sound emission direction while centering the second voice coil 17 and the like by the first damper 19 and the second damper 20. The speaker device 1 can be easily installed on, for example, a thin member or a thin device.

[0053] Furthermore, in the speaker device 1, by providing the second damper 20 on the inner side of the first damper 19, the inside of the second bobbin 16 can be closed without using a cap 201 (see FIG. 3).

[0054] The speaker device 1 includes a support member 60 (rear side support member). The support member 60 supports the second damper 20 from the inside in the radial direction of the second damper 20.

[0055] As a result, the speaker device 1 can accurately determine the position of the second damper 20 by supporting the second damper 20 from the inside in the radial direction of the second damper 20. Therefore, the speaker device 1 can accurately center the second bobbin 16 and the second voice coil 17. Furthermore, the speaker device 1 can damp radial vibrations generated in the second voice coil 17 and the second bobbin 16 inside the second bobbin 16.

[0056] (Second embodiment) Next, a speaker device 100 according to a second embodiment will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view showing an outline of the speaker device 100 according to the second embodiment. The speaker device 100 according to the second embodiment will be described mainly focusing on the differences from the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

[0057] The diaphragm 101 is provided behind the third damper 21. The diaphragm 101 is formed so as to be recessed from the rear to the front.

[0058] The speaker unit 110 further includes a fourth damper 111. The fourth damper 111 supports the first voice coil 15. The fourth damper 111 supports the first voice coil 15 via the first bobbin 14. The fourth damper 111 is provided more inward than the third damper 21. The fourth damper 111 is formed in an annular shape. The fourth damper 111 is provided between the first bobbin 14 and a support member 112 (sound-emitting-side support member). The support member 112 is, for example, a resin member. The support member 112 is cylindrical. The support member 112 is provided on the radially central side of the plate 31 of the first magnetic circuit 10. The support member 112 is provided coaxially with the plate 31 of the first magnetic circuit 10. The support member 112 is attached to the plate 31 of the first magnetic circuit 10. The support member 112 is provided coaxially with the support member 60 .

[0059] The inner peripheral end of the fourth damper 111 is attached to the outer peripheral surface of the support member 112. The fourth damper 111 is formed in a bellows shape with repeated concave and convex patterns along the radial direction. The bellows shape is formed around the entire circumferential direction of the fourth damper 111. In other words, the fourth damper 111 is formed with concentric waveforms that continue in the radial direction.

[0060] In the speaker device 100, a vibration system including the first voice coil 15 and the first bobbin 14 is centered in the radial direction of the first bobbin 14 by the third damper 21 and the fourth damper 111. Furthermore, in the speaker device 100, the third damper 21 and the fourth damper 111 damp radial vibrations generated in the first voice coil 15 and the first bobbin 14.

[0061] In the speaker device 100, vibrations of the first voice coil 15 in the sound output direction are transmitted to the first magnetic circuit 10 via the fourth damper 111 and the support member 112. In the speaker device 1, vibrations of the second voice coil 17 in the sound output direction are transmitted to the second magnetic circuit 11 via the second damper 20 and the support member 60.

[0062] Therefore, the speaker device 100 can reduce unnecessary vibrations that occur when emitting sound by the vibrations transmitted to the second magnetic circuit 11.

[0063] The speaker device 100 includes a third damper 21 and a fourth damper 111. The third damper 21 supports the first voice coil 15. The fourth damper 111 is provided radially inward of the third damper 21 relative to the first voice coil 15, and supports the first voice coil 15.

[0064] As a result, the speaker device 100 can center the first voice coil 15 and the like by the third damper 21 and the fourth damper 111, and can reduce the thickness of the speaker device 100 in the sound output direction.

[0065] The speaker device 100 includes a support member 112 (sound-emitting-side support member). The support member 112 supports the fourth damper 111 from the inside in the radial direction of the fourth damper 111.

[0066] As a result, the speaker device 100 can accurately determine the position of the fourth damper 111 by supporting the fourth damper 111 from the radially inner side of the fourth damper 111. Therefore, the speaker device 100 can accurately center the first bobbin 14 and the first voice coil 15. Furthermore, the speaker device 100 can damp radial vibrations generated in the first voice coil 15 and the first bobbin 14 inside the first bobbin 14.

[0067] In a speaker device 100 according to a modified example of the second embodiment, the support members 60, 112 may be integrally provided. For example, the speaker device 100 according to the modified example may be provided as a single support member 120 as shown in FIG. 5. FIG. 5 is a cross-sectional view showing an outline of the speaker device 100 according to the modified example. In the speaker device 100 according to the modified example, the single support member 120 is provided so as to penetrate the first magnetic circuit 10 and the second magnetic circuit 11. The support member 120 is attached to the first magnetic circuit 10 and the second magnetic circuit 11. In the speaker device 100 according to the modified example, the two support members 60, 112 may be joined at their ends.

[0068] As a result, in the speaker device 100 according to the modified example, vibrations of the first bobbin 14 and the first voice coil 15 in the sound emission direction and vibrations of the second bobbin 16 and the second voice coil 17 in the sound emission direction are transmitted to the integrally provided support member 120. Therefore, the speaker device 100 according to the modified example can reduce unnecessary vibrations of the first bobbin 14 and the first voice coil 15 in the sound emission direction by the vibrations of the second bobbin 16 and the second voice coil 17 transmitted via the support member 120.

[0069] In the speaker device 1, 100 according to the modified example, the second damper 20 may be circular. For example, the second damper 20 is formed such that the center side of the second damper 20, i.e., the vicinity of the center in the radial direction, is flat. The vicinity of the center of the flat plate shape of the second damper 20 is attached to the support member 60, 112. In the speaker device 100 according to the modified example, the fourth damper 111 may also be circular.

[0070] In the speaker devices 1 and 100 according to the modified examples, the inner peripheral end of the second damper 20 may be attached to the outer peripheral surface of the plate 41 of the second magnetic circuit 11. That is, the second damper 20 may be provided between the plate 41 of the second magnetic circuit 11 and the second voice coil 17.

[0071] Furthermore, in the speaker device 1, 100 according to the modified example, the magnetization direction of the magnet of the first magnetic circuit and the magnetization direction of the magnet of the second magnetic circuit may be opposite to each other. As a result, the speaker device 1, 100 according to the modified example can generate vibration in the second voice coil 17 in the opposite direction to the vibration of the first voice coil 15 in the sound output direction, thereby reducing the vibration in the sound output direction.

[0072] Although the speaker devices 1 and 100 according to the above embodiment and the modified example have been described as being of an internal magnet type, they may also be of an external magnet type.

[0073] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0074] 1, 100 speaker device 2 speaker boxes 3 speaker units 10 First magnetic circuit 11 Second magnetic circuit 12 First Frame 13 Second Frame 14 No. 1 bobbin 15 First voice coil 16 Second bobbin 17 Second voice coil 18 Diaphragm 19 First damper 20 Second damper 21 Third damper 33 First magnetic gap 43 Second magnetic gap 60 Support member (rear side support member) 111 4th Damper 112 Support member (sound-emitting side support member) 120 Support member

Claims

1. a first magnetic circuit in which a first magnetic gap is formed and which is provided on the sound output side; a second magnetic circuit having a second magnetic gap formed therein and provided on the rear side of the first magnetic circuit in a direction opposite to the sound output side; a first voice coil disposed in the first magnetic gap; a second voice coil disposed in the second magnetic gap; a first damper supporting the second voice coil; a second damper that is provided radially inward of the first damper and supports the second voice coil; A speaker device comprising:

2. a rear support member that supports the second damper from the inside in the radial direction of the second damper; The speaker device according to claim 1 , comprising:

3. a third damper supporting the first voice coil; a fourth damper that is disposed radially inward of the third damper relative to the first voice coil and supports the first voice coil; The speaker device according to claim 1 or 2, comprising:

4. a sound-emitting-side support member that supports the fourth damper from the inside in the radial direction of the fourth damper; The speaker device according to claim 3 , comprising:

5. a rear support member that supports the second damper from an inner side in a radial direction of the second damper, The speaker device according to claim 4 , wherein the rear support member and the sound-emitting support member are integrally provided.

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