Speaker device

Abstract

To provide a speaker device capable of reducing its thickness while suppressing vibration.SOLUTION: A speaker device comprises a magnetic circuit, a first voice coil, and a second voice coil. On the magnetic circuit, a first magnetic gap and a second magnetic gap are arranged in a radial direction. The first voice coil is arranged at the first magnetic gap. The second voice coil is arranged at the second magnetic gap.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 magnetic circuit, a first voice coil, and a second voice coil. The magnetic circuit has a first magnetic gap and a second magnetic gap arranged in a radial direction. The first voice coil is arranged in the first magnetic gap. The second voice coil is arranged in the second magnetic gap. [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. 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 magnetic circuit 10, a frame 11, a first bobbin 12, a first voice coil 13, a second bobbin 14, a second voice coil 15, a diaphragm 16, a first damper 17, and a second damper 18.

[0014] The magnetic circuit 10 includes a first magnetic circuit 20 and a second magnetic circuit 30. The first magnetic circuit 20 includes a magnet 21, a plate 22, and a yoke .

[0015] The magnet 21 is formed in a cylindrical shape. The plate 22 is also formed in a cylindrical shape. The plate 22 is provided in front of the magnet 21. The rear end surface of the plate 22 is joined to the front end surface of the magnet 21.

[0016] The yoke 23 includes a bottom plate portion 23a, a pole portion 23b (cylindrical portion), and a flange portion 23c. The bottom plate portion 23a is formed in a circular shape. The bottom plate portion 23a includes a protrusion portion 23d that protrudes forward. The protrusion portion 23d is formed in a cylindrical shape. The protrusion portion 23d is provided at the center of the bottom plate portion 32a in the radial direction of the bottom plate portion 23a. The protrusion portion 32d is provided behind the magnet 21. The front end surface of the protrusion portion 32d is joined to the rear end surface of the magnet 21.

[0017] The magnet 21 is sandwiched between the protruding portion 23d of the yoke 23 and the plate 22, and is fixed to the protruding portion 23d of the yoke 23 and the plate 22. In the first magnetic circuit 20, the magnet 21, the plate 22, and the yoke 23 are arranged coaxially.

[0018] The pole portion 23b is formed to protrude forward from the bottom plate portion 32a. The pole portion 23b is formed in a cylindrical shape. The inner diameter of the pole portion 23b is larger than the outer diameters of the magnet 21, the plate 22, and the protrusion 32d.

[0019] The flange portion 23c protrudes outward from the rear end side of the pole portion 23b in the radial direction of the yoke 23. The flange portion 23c is formed in an annular shape around the pole portion 23b.

[0020] In the first magnetic circuit 20, a first magnetic gap 24 is formed in the radial direction of the first magnetic circuit 20 between the plate 22, the magnet 21, and the protrusion 32c of the yoke 23 and the pole portion 23b of the yoke 23. The first magnetic gap 24 is formed in an annular shape. The first magnetic gap 24 is formed so that its front end is open.

[0021] The first magnetic circuit 20 is an internal magnetic type magnetic circuit in which the magnet 21 is provided inside the pole portion 23b.

[0022] The second magnetic circuit 30 is provided radially outward of the first magnetic circuit 20. The second magnetic circuit 30 includes a magnet 31, a plate 32, and a yoke 23. The first magnetic circuit 20 and the second magnetic circuit 30 include a common yoke 23.

[0023] The magnet 31 is formed in an annular shape. The magnet 31 is provided outside the pole portion 23b of the yoke 23 in the radial direction of the magnetic circuit 10. The magnet 31 is provided in front of the flange portion 23c of the yoke 23. The rear end surface of the magnet 31 is joined to the front end surface of the flange portion 23c of the yoke 23.

[0024] The plate 32 is formed in an annular shape and is provided in front of the magnet 31. The rear end surface of the plate 32 is joined to the front end surface of the magnet 31.

[0025] In the second magnetic circuit 30, a second magnetic gap 34 is formed between the pole portion 23b of the yoke 23 and the magnet 31 and plate 32 in the radial direction of the magnetic circuit 10. The second magnetic gap 34 is formed outside the first magnetic gap 24 in the radial direction of the magnetic circuit 10. The second magnetic gap 34 is formed in an annular shape. The second magnetic gap 34 is formed so that its front end is open. In the magnetic circuit 10, the first magnetic gap 24 and the second magnetic gap 34 are arranged in the radial direction of the magnetic circuit 10. Specifically, the first magnetic gap 24 and the second magnetic gap 34 are arranged side by side from the inside to the outside along the radial direction of the magnetic circuit 10.

[0026] The second magnetic circuit 30 is an external magnetic type magnetic circuit in which the magnet 31 is provided outside the pole portion 23b.

[0027] The frame 11 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 plate 32 of the second magnetic circuit 30 is fixed around the hole 50a. Specifically, the front end of the plate 32 is attached and fixed to the rear end of the main body 50. The frame 11 supports the 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 first bobbin 12 is formed in a cylindrical shape. A portion of the first bobbin 12 is inserted into a first magnetic gap 24 formed in the first magnetic circuit 20.

[0030] The first voice coil 13 is disposed in the first magnetic gap 24. The first voice coil 13 is wound around the outer peripheral surface of the first bobbin 12. That is, the first voice coil 13 is formed in a cylindrical shape. An audio input signal is supplied to the first voice coil 13 from the outside via a connection terminal or the like. The first voice coil 13 is a voice coil used to emit sound.

[0031] The second bobbin 14 is formed in a cylindrical shape. A portion of the second bobbin 14 is inserted into a second magnetic gap 34 formed in the second magnetic circuit 30.

[0032] The second voice coil 15 is disposed in the second magnetic gap 34. The second voice coil 15 is wound around the outer peripheral surface of the second bobbin 14. That is, the second voice coil 15 is formed in a cylindrical shape. An input signal corresponding to an audio input signal is supplied to the second voice coil 15. 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. The second voice coil 15 is a voice coil used for vibration reduction.

[0033] The diaphragm 16 is provided on the front end side of the frame 11. The diaphragm 16 is formed in a cone shape. The diaphragm 16 is formed so as to be concave from the front to the rear. In other words, the diaphragm 16 is formed so as to have a smaller diameter from the front to the rear. The diaphragm 16 is attached to the main body part 50 of the frame 11 via an edge 16a. The edge 16a is formed in an annular shape. The edge 16a is provided between the outer peripheral edge of the diaphragm 16 and the main body part 50 of the frame 11.

[0034] A hole 16b is formed at the rear end of the diaphragm 16. The hole 16b is formed in the radial center of the diaphragm 16. The first bobbin 12 is inserted into the hole 16b. The diaphragm 16 is attached to the first bobbin 12. The inner peripheral edge of the diaphragm 16 is attached to the first bobbin 12. The outer peripheral edge of the diaphragm 16 is attached to the frame 11 via an edge 16a.

[0035] The first damper 17 is provided behind the diaphragm 16. The first damper 17 is provided ahead of the magnetic circuit 10. The first damper 17 supports the first voice coil 13. The first damper 17 supports the first voice coil 13 via the first bobbin 12. The first damper 17 is formed in an annular shape. The first damper 17 is provided between the first bobbin 12 and the main body 50 of the frame 11. The inner peripheral end of the first damper 17 is attached to the outer peripheral surface of the first bobbin 12. The outer peripheral end of the first damper 17 is attached to the inner peripheral surface of the main body 50 of the frame 11.

[0036] At least a portion of the first damper 17 is formed in a bellows shape with repeated concave and convex portions along the radial direction of the first damper 17. The bellows shape is formed over the entire circumferential direction of the first damper 17. In other words, the first damper 17 is formed with concentric waveforms that continue in the radial direction.

[0037] The second damper 18 is provided rearward of the first damper 17. The second damper 18 is provided forward of the magnetic circuit 10. The second damper 18 supports the second voice coil 15. The second damper 18 supports the second voice coil 15 via the second bobbin 14. The second damper 18 is formed in an annular shape. The second damper 18 is provided between the second bobbin 14 and the main body 50 of the frame 11. The inner peripheral end of the second damper 18 is attached to the outer peripheral surface of the second bobbin 14. The outer peripheral end of the second damper 18 is attached to the inner peripheral surface of the main body 50 of the frame 11.

[0038] In the speaker device 1, when an input audio signal is supplied to the first voice coil 13, the first voice coil 13 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 20. The vibration of the first voice coil 13 in the sound emission direction vibrates the first bobbin 12. The vibration of the first bobbin 12 is then transmitted to the diaphragm 16, causing the speaker device 1 to emit sound forward from the diaphragm 16.

[0039] Vibrations of the first voice coil 13 in the sound output direction are transmitted to the members around the speaker device 1 via the first damper 17, the diaphragm 16, and the frame 11. The speaker device 1 has a second voice coil 15, a second magnetic circuit 30, etc. to suppress transmission of the vibrations of the first voice coil 13 in the sound output direction to the members around the speaker device 1.

[0040] The speaker device 1 generates vibrations in the second voice coil 15 corresponding to the vibrations of the first voice coil 13 in the sound emission direction. For example, as shown in Fig. 2, when vibrations are generated such that the first voice coil 13 moves forward, the speaker device 1 supplies an input signal to the second voice coil 15 so as to generate vibrations such that the second voice coil 15 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 13 and the second voice coil 15 in the speaker device 1.

[0041] That is, the speaker device 1 vibrates the second voice coil 15 so as to cancel unnecessary vibration of the frame 11 caused by vibration of the first voice coil 13 in the sound output direction. The speaker device 1 supplies an input signal to the second voice coil 15 so as to generate vibration in the opposite direction to the vibration of the first voice coil 13 in the sound output direction. This reduces unnecessary vibration of the frame 11 and suppresses transmission of vibration to members around the speaker device 1.

[0042] In the speaker device 1, the vibration system including the first voice coil 13 and the first bobbin 12 is centered in the radial direction of the first bobbin 12 by the first damper 17. In addition, in the speaker device 1, the first damper 17 damps radial vibrations generated in the first voice coil 13 and the first bobbin 12.

[0043] In the speaker device 1, the vibration system including the second voice coil 15 and the second bobbin 14 is centered in the radial direction of the second bobbin 14 by the second damper 18. In the speaker device 1, the second damper 18 damps radial vibrations generated in the second voice coil 15 and the second bobbin 14.

[0044] In the speaker device 1, the magnetization of the magnet 31, the width of the magnet 31, the width of the first magnetic gap 24, and the width of the second magnetic gap 34 are set. As a result, the speaker device 1 can vibrate the first voice coil 13 and the second voice coil 15 using the common magnet 31.

[0045] In a speaker device 200 according to a comparative example that does not use the second damper 18 of the embodiment, for example, a first magnetic circuit 201 and a second magnetic circuit 202 are arranged side by side in the front-rear direction. Fig. 3 is a cross-sectional view showing an outline of the speaker device 200 according to the comparative example.

[0046] However, in the speaker device 200 according to the comparative example, the first magnetic circuit 20 and the second magnetic circuit 30 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.

[0047] In contrast, the speaker device 1 includes a magnetic circuit 10, a first voice coil 13, and a second voice coil 15. The magnetic circuit 10 has a first magnetic gap 24 and a second magnetic gap 34 arranged in the radial direction. The first voice coil 13 is arranged in the first magnetic gap 24. The second voice coil 15 is arranged in the second magnetic gap 34.

[0048] This allows the speaker device 1 to be thin. For example, even if the speaker device 1 has a mechanism for suppressing vibration in the sound output direction, the thickness of the speaker device 1 in the sound output direction can be thin. That is, the speaker device 1 can be thin in the sound output direction while suppressing vibration. The speaker device 1 can be easily installed in, for example, a thin member or a thin device.

[0049] The magnetic circuit 10 includes a first magnetic circuit 20 and a second magnetic circuit 30. The first magnetic circuit 20 and the second magnetic circuit 30 include a common yoke 23. The yoke 23 includes a pole portion 23b (a cylindrical portion) that forms a first magnetic gap 24 and a second magnetic gap 34.

[0050] This allows the speaker device 1 to reduce the radial length of the magnetic circuit 10 including the first magnetic circuit 20 and the second magnetic circuit 30. Furthermore, by using the yoke 23 as a common component in the first magnetic circuit 20 and the second magnetic circuit 30, the speaker device 1 can reduce the number of components in the magnetic circuit 10, suppress vibrations, and reduce the thickness in the sound emission direction.

[0051] The speaker device 1 includes a first damper 17, a second damper 18, and a frame 11. The first damper 17 supports the first voice coil 13. The second damper 18 supports the second voice coil 15. The frame 11 is attached to the outer circumferential ends of the first damper 17 and the second damper 18.

[0052] As a result, the speaker device 1 transmits vibrations in the first voice coil 13 to the frame 11 via the first damper 17. Also, the speaker device 1 transmits vibrations in the second voice coil 15 to the frame 11 via the second damper 18. For example, when reducing unnecessary vibrations caused by the first voice coil 13 by vibrations generated by the second voice coil 15, the speaker device 1 transmits vibrations caused by the second voice coil 15 to the frame 11 to which the vibrations caused by the first voice coil 13 are transmitted. The speaker device 1 can reduce unnecessary vibrations by transmitting each vibration to the same frame 11.

[0053] (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.

[0054] The magnetic circuit 101 includes a first magnetic circuit 110 and a second magnetic circuit 120. The first magnetic circuit 110 includes a first member 111, a magnet 112, and a second member 113.

[0055] The first member 111 is a metal member. The first member 111 is provided at the center of the magnetic circuit 101 in the radial direction of the first magnetic circuit 110. The first member 111 includes a plate portion 111a and a protruding portion 111b. The plate portion 111a is formed in a circular shape. The protruding portion 111b protrudes rearward from the center of the first magnetic circuit 110 in the radial direction. The protruding portion 111b is cylindrical. The plate portion 111a of the first member 111 functions as a plate in the first magnetic circuit 110.

[0056] The magnet 112 is cylindrical. The magnet 112 is provided behind the plate portion 111a of the first member 111. The front end surface of the magnet 112 is joined to the rear end surface of the plate portion 111a of the first member 111. The magnet 112 is provided outside the protrusion 111b of the first member 111 in the radial direction of the first magnetic circuit 110.

[0057] The second member 113 is a metal member. The second member 113 is provided further outward than the protruding portion 111b of the first member 111 in the radial direction of the first magnetic circuit 20. The second member 113 includes a plate portion 113a and a protruding portion 113b. The plate portion 113a is formed in an annular shape. The plate portion 113a is provided rearward of the magnet 112. A front end surface of the plate portion 113a is joined to a rear end surface of the magnet 112. Specifically, a front end surface of the plate portion 113a that is on the inner side in the radial direction of the first magnetic circuit 110 is joined to a rear end surface of the magnet 112.

[0058] The protrusion 113b protrudes forward from the plate portion 113a. The protrusion 113b is formed in a cylindrical shape. The protrusion 113b is provided further outward than the magnet 112 and the plate portion 111a of the first member 111 in the radial direction of the first magnetic circuit 110. The protrusion 113b of the second member 113 functions as a pole portion in the first magnetic circuit 110. The front end surface of the protrusion 113b is joined to the rear end surface of the frame 11. The first magnetic circuit 110 is supported by the frame 11.

[0059] In the first magnetic circuit 110, a first magnetic gap 114 is formed in the radial direction of the first magnetic circuit 110 between the plate portion 111a of the first member 111, the magnet 112, and the protrusion 113b of the second member 113. The first magnetic gap 114 is formed in an annular shape. The first magnetic gap 114 is formed so that its front end is open. The first magnetic circuit 110 is an internal magnet type magnetic circuit.

[0060] In the first magnetic circuit 110, a first member 111, a magnet 112, and a second member 113 are coaxially arranged.

[0061] The second magnetic circuit 120 includes a first member 111, a magnet 112, and a second member 113. That is, in the magnetic circuit 101, the first magnetic circuit 110 and the second magnetic circuit 120 use common members.

[0062] The plate portion 113a of the second member 113 functions as a plate in the second magnetic circuit 120. The protrusion 111b of the first member 111 functions as a pole portion in the second magnetic circuit 120. In the second magnetic circuit 120, a second magnetic gap 121 is formed between the protrusion 111b of the first member 111 and the magnet 112, and between the plate portion 113a of the second member 113. The second magnetic gap 121 is formed in an annular shape. The second magnetic gap 121 is formed so that its rear end is open. The second magnetic circuit 120 is an external magnet type magnetic circuit.

[0063] In the magnetic circuit 101, the first magnetic gap 114 is formed outside the second magnetic gap 121 in the radial direction of the magnetic circuit 101.

[0064] The second bobbin 130 is inserted into the second magnetic gap 121 from the rear side. A cap 131 is provided at the rear end of the second bobbin 130. The cap 131 closes the rear end of the second bobbin 130. A second voice coil 132 is wound around the outer circumferential surface of the second bobbin 130.

[0065] The second damper 133 is provided behind the magnetic circuit 101. The second damper 133 is provided between the second bobbin and the support member .

[0066] The support member 134 is provided behind the plate portion 113a of the second member 113. The support member 134 is attached to the plate portion 113a of the second member 113. The support member 134 is formed in an annular shape.

[0067] The inner peripheral end of the second damper 133 is attached to the outer peripheral surface of the second bobbin 130. The outer peripheral end of the second damper 133 is attached to the inner peripheral surface of the support member 134.

[0068] In the speaker device 100, vibrations caused by the second damper 133 are transmitted to the frame 11 via the second member 113. Then, unnecessary vibrations of the frame 11 are reduced, and transmission of vibrations to members around the speaker device 100 is suppressed.

[0069] The magnetic circuit 101 includes a first magnetic circuit 110 and a second magnetic circuit 120. The first magnetic circuit 110 and the second magnetic circuit 120 include a common magnet 112. The magnet 112 is cylindrical and forms a first magnetic gap 114 and a second magnetic gap 121.

[0070] This allows the speaker device 100 to reduce the radial length of the magnetic circuit 101 including the first magnetic circuit 110 and the second magnetic circuit 120. Furthermore, by using the magnet 112 as a common component in the first magnetic circuit 110 and the second magnetic circuit 120, the speaker device 1 can reduce the number of components in the magnetic circuit 10, suppress vibrations, and reduce the thickness in the sound emission direction.

[0071] The first voice coil 13 is a voice coil used for emitting sound. The second voice coil 15 is a voice coil used for reducing vibration. The second magnetic gap 34 is located radially inward of the first magnetic gap 24 of the magnetic circuit 10 and opens to the rear surface side opposite the sound emitting direction.

[0072] This allows the speaker device 100 to reduce the radial length of the magnetic circuit 10. When the second magnetic circuit 120 is provided to reduce vibration in the sound emission direction, the speaker device 100 can reduce the radial length of the magnetic circuit 10 by providing the second magnetic circuit 120 more inward than the first magnetic circuit 20.

[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, 101 Magnetic circuit 11 frames 12 First bobbin 13 First voice coil 14 No. 2 bobbin 15, 132 Second voice coil 16 Diaphragm 17 First damper 18, 133 Second damper 20, 110 First magnetic circuit 21 Magnet 22 Plate 23 York 24 First magnetic gap 30, 120 Second magnetic circuit 31 Magnet 34 Second magnetic gap 111 First member 112 Magnet 113 Second member

Claims

1. a magnetic circuit in which a first magnetic gap and a second magnetic gap are arranged in a radial direction; a first voice coil disposed in the first magnetic gap; a second voice coil disposed in the second magnetic gap; Equipped with The magnetic circuit comprises: a first magnetic circuit in which the first magnetic gap is formed; a second magnetic circuit in which the second magnetic gap is formed, the first magnetic circuit and the second magnetic circuit include a common yoke; the yoke includes a cylindrical portion that forms the first magnetic gap and the second magnetic gap; the first magnetic gap and the second magnetic gap are open in a sound output direction, the magnet of the first magnetic circuit is provided inside the cylindrical portion, The magnet of the second magnetic circuit is provided outside the cylindrical portion.

2. a first damper supporting the first voice coil; a second damper supporting the second voice coil; a frame to which an outer peripheral end of the first damper and an outer peripheral end of the second damper are attached; The speaker device according to claim 1 , comprising:

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