Speaker device

Abstract

To provide a speaker device which has an assemblability at a manufacturing, and can improve vibration damping properties while maintaining a quality of a low sound reproduction.SOLUTION: A speaker device 1 comprises: a first voice coil 11; a second voice coil 21 arranged to an outside of a radial direction of the first voice coil 11; a first dumper part 14 that supports the first voice coil 11 to a frame 3; and a second dumper part 22 that supports the second voice coil 21 to the frame 3. The first dumper part 14 includes a concave part 142 that is separated to the second voice coil 21 from the other part in the first dumper part 14 on an extension line of a vibration direction of the second voice coil 21.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a speaker device. [Background technology]

[0002] Speaker devices that reproduce sound by vibrating a diaphragm are widely used in vehicles, for example, in the interior of an automobile, to reproduce sounds such as music and voices. Patent Document 1 describes a method in which a second driving means is disposed facing in the opposite direction to a first driving means having a diaphragm as a sound emitting member, and the vibration of the first driving means is offset by a reaction force.

[0003] Patent document 2 describes a speaker device that includes a main body that performs the primary function of radiating sound waves to the sound output side, and a vibration suppression section that suppresses vibrations generated in the magnetic circuit due to vibrations of the vibration system of the main body when the device is driven. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 60-6157 [Patent Document 2] JP 2006-13587 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the speaker device of Patent Document 1 is larger in height (length in the vibration direction) than a normal speaker having only the first driving means, and two driving means (speaker units) are made and fastened, which significantly increases the number of steps and makes the assembly difficult. In addition, the speaker device of Patent Document 2 shares one hollow disk-shaped magnet in the magnetic circuit, so the length of the damper of the vibration suppression unit is small, and the vibration suppression unit cannot obtain a sufficient amplitude amount to offset the vibration of the main body unit. In addition, if the amplitude amount is increased, there is a risk of interference between the diaphragm of the main body unit and the voice coil of the vibration suppression unit. In addition, the speaker device of the second embodiment of Patent Document 2 has the voice coil of the main body unit arranged on the outside, so the amplitude amount of the main body unit is small, and it is not suitable for a woofer for reproducing low-pitched sounds with a large output. In particular, speaker devices such as woofers that reproduce low-pitched sounds or deep low-pitched sounds have relatively large driving means themselves, so they require ingenuity to be installed in vehicles with limited installation space, and there is a demand for space-saving and thin speakers.

[0006] The present disclosure has been made to solve such problems, and has an object to provide a speaker device that can be easily assembled during manufacturing and can improve vibration-damping characteristics while maintaining the quality of audio reproduction, and also to provide a speaker device that can achieve both improved vibration-damping characteristics and a slim design. [Means for solving the problem]

[0007] The present disclosure has been made to solve at least some of the problems described above, and can be realized in the following aspects.

[0008] The speaker device of this embodiment comprises a first voice coil, a second voice coil arranged radially outside the first voice coil, a first damper supporting the first voice coil on a frame, and a second damper supporting the second voice coil on the frame, wherein the first damper has a recessed portion on an extension line of the vibration direction of the second voice coil that is spaced further away from the second voice coil than other portions of the first damper.

[0009] The second voice coil of the speaker device may be capable of vibrating in a direction opposite to that of the first voice coil.

[0010] In the speaker device, a portion of the second voice coil may be located within the recess when the first damper and the second voice coil are closest to each other.

[0011] The second damper of the speaker device may be formed of a plurality of support members arranged side by side in the vibration direction.

[0012] The speaker device may further include a magnetic circuit having a first magnet and a second magnet, the first magnet and the second magnet being arranged side by side in the vibration direction.

[0013] The speaker device of this embodiment comprises a first voice coil, a second voice coil arranged radially outside the first voice coil, a first damper supporting the first voice coil on a frame, a second damper supporting the second voice coil on the frame, and a magnetic circuit having a first magnet and a second magnet, the first magnet and the second magnet being arranged side by side in the vibration direction of the first voice coil.

[0014] The magnetic circuit of the speaker device may include an intermediate magnetic member connected to the first magnet and connected to the second magnet on a surface different from that of the first magnet.

[0015] The intermediate magnetic member of the speaker device may form a first magnetic gap in which the first voice coil is disposed, and a second magnetic gap in which the second voice coil is disposed.

[0016] The magnetic circuit of the speaker device may have the first magnet and a first magnetic member connected to the intermediate magnetic member on different sides, and the first magnetic gap may be formed between the intermediate magnetic member and the first magnetic member.

[0017] The magnetic circuit of the speaker device may have the second magnet and a second magnetic member connected to the intermediate magnetic member on a different surface, and the second magnetic gap may be formed between the intermediate magnetic member and the second magnetic member.

[0018] The first magnet and the second magnet of the speaker device may be disposed radially inside the second voice coil.

[0019] In the above speaker device, the first magnet may be arranged radially inside the first voice coil, the second magnet may be arranged radially outside the second voice coil, the intermediate magnetic member may have a central portion connected to the first magnet and an outer peripheral portion connected to the second magnet, and the first magnet may be connected to the central portion of the intermediate magnetic member, and the second magnet may be connected to the outer peripheral portion of the intermediate magnetic member.

[0020] The first damper of the speaker device may have a recessed portion on an extension line of a vibration direction of the second voice coil, the recessed portion being farther away from the second voice coil than other portions of the first damper.

[0021] The recessed portion of the speaker device may have a higher rigidity than other portions of the first damper.

[0022] The intermediate magnetic member of the speaker device may be formed with a protrusion that protrudes radially outward and forms the second magnetic gap.

[0023] The speaker device may have a first driving unit having the first voice coil, a diaphragm connected to the first voice coil, and the first damper, and a second driving unit having the second voice coil and the second damper, and a second vibration force generated in the speaker device in response to vibration of the second driving unit may be in the opposite direction to but at the same time as a first vibration force generated in the speaker device in response to vibration of the first driving unit.

[0024] The speaker device may include a housing that houses the first driving section and the second driving section, and a minimum resonance frequency of the second driving section may be the same as a minimum resonance frequency of the first driving section.

[0025] The second electric signal that vibrates the second voice coil of the speaker device may be different from the first electric signal that vibrates the first voice coil. Effect of the Invention

[0026] According to the speaker device of the present disclosure using the above-mentioned means, the assembly during manufacturing is improved, and the vibration-damping characteristics can be improved while maintaining the quality of the sound reproduction. In addition, it is possible to achieve both improved vibration-damping characteristics and a thinner design. [Brief description of the drawings]

[0027] [Figure 1] 1 is a perspective view of a speaker device according to a first embodiment of the present disclosure. [Diagram 2] 1 is a side cross-sectional view of a speaker device according to a first embodiment of the present disclosure. [Diagram 3] FIG. 2 is an explanatory diagram showing the arrangement of magnetized surfaces of a magnet and the direction of the magnetic field of a magnetic circuit according to the first embodiment of the present disclosure. [Figure 4] 4 is an explanatory diagram showing an amplitude of a driver of the speaker device according to the first embodiment of the present disclosure. FIG. [Diagram 5] 11 is a perspective view of a speaker device according to a second embodiment of the present disclosure. FIG. [Figure 6] 11 is a side cross-sectional view of a speaker device according to a second embodiment of the present disclosure. FIG. [Figure 7] FIG. 11 is an explanatory diagram showing the arrangement of magnetized surfaces of a magnet and the direction of the magnetic field of a magnetic circuit according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0029] (First embodiment) Fig. 1 is a perspective view of a speaker device 1 according to a first embodiment of the present disclosure. Fig. 2 is a side cross-sectional view in an XZ plane passing through a central axis O1 of the speaker device 1. Hereinafter, the configuration of the speaker device 1 according to the first embodiment will be described with reference to these drawings.

[0030] The speaker device 1 of this embodiment is a speaker mounted on, for example, a vehicle door, and the main part is symmetrical with respect to the central axis O1 as shown in FIG. 2. The speaker device 1 has a housing (enclosure) not shown, a frame 3 attached to the housing, a first driving unit 10 attached to the frame 3, a second driving unit 20 attached to the frame 3, and a magnetic circuit 30 having a magnetic body and a magnet. In the following description, a direction parallel to the central axis O1 is called an axial direction, and in the axial direction, a direction from the second driving unit 20 to the first driving unit 10 is called a forward direction, and a direction from the first driving unit 10 to the second driving unit 20 is called a rearward direction. In addition, a direction radiating outward perpendicularly from the central axis O1 is called a radial direction. The speaker device 1 radiates sound forward from the first driving unit 10. In addition, the speaker device 1 is, for example, a woofer or a subwoofer, and is capable of reproducing low-pitched sounds with a large input.

[0031] The first driving section 10 includes a first voice coil 11, a diaphragm 12, an edge section 13, a first damper section 14, and a center cap 15.

[0032] The first voice coil 11 is composed of a first bobbin 111 having a cylindrical shape coaxial with the central axis O1 and a first coil 112 wound around the outer circumferential surface of the first bobbin 111, and is disposed in the center of the speaker device 1. The diaphragm 12 is a sound-emitting member that has a circular hole at its center coaxial with the central axis O1, has a cone shape extending radially outward and forward from the inner circumferential edge of the circular hole, and is disposed radially outward of the first voice coil 11. The inner circumferential edge of the diaphragm 12 is connected to the outer circumferential surface of the first voice coil 11. An edge portion 13 is formed between the outer circumferential edge of the diaphragm 12 and the frame 3. The edge portion 13 is annular in shape forming a recess having an inverted U-shaped cross section with an inner circumferential edge overlapping the outer circumferential edge of the diaphragm 12, and its outer circumferential edge is connected to the frame 3.

[0033] The first damper section 14 is an elastic body having a circular hole at the center, which is coaxial with the central axis O1, and which has an annular disk shape extending radially outward from the inner peripheral edge where the circular hole is formed, and is disposed radially outward from the first voice coil 11 and behind the diaphragm 12. The first damper section 14 has a corrugated cross section as a whole, the detailed shape of which will be described later. The first damper section 14 has an inner peripheral edge connected to the outer peripheral surface of the first voice coil 11 and an outer peripheral edge connected to the frame 3. The first damper section 14 connects the first voice coil 11 and the frame 3, and supports the first voice coil 11 so that it can vibrate in the direction of the central axis O1. The vibration direction of the first voice coil 11 is the same as the axial direction.

[0034] The frame 3 has a cross-sectional concave shape whose diameter gradually decreases toward the rear, and the rear end of the frame 3 is connected to a second yoke 35 (described later) of the magnetic circuit 30. A center cap 15, which is a sound-emitting member, is disposed in the center of the first driving unit 10 so as to cover a portion of the center of the first voice coil 11 and the diaphragm 12. The outer periphery of the center cap 15 is connected to a portion of the top surface (front surface) of the diaphragm 12.

[0035] The second driving section 20 includes a second voice coil 21 and a second damper section 22.

[0036] The second voice coil 21 is composed of a second bobbin 211 that is cylindrical and coaxial with the central axis O1 and has a larger diameter than the first bobbin 111, and a second coil 212 that is wound around the outer circumferential surface of the second bobbin 211, and is disposed concentrically with the first voice coil 11 at the center of the speaker device 1 and radially outward from the first voice coil 11.

[0037] The second damper section 22 is composed of two dampers 22a and 22b, which are support members, and a spacer 23 for maintaining the axial distance between the two dampers 22a and 22b. In the following description, when it is necessary to distinguish between the two dampers 22a and 22b, the one disposed closer to the diaphragm 12 will be called the damper 22a, and the other will be called the damper 22b. The dampers 22a and 22b are elastic bodies having a circular hole at the center coaxial with the central axis O1 and extending radially outward from the inner peripheral edge where the circular hole is formed. The dampers 22a and 22b are arranged radially outward from the second voice coil 21, side by side in the axial direction with the spacer 23 between them. Specifically, the rear surface of the outer peripheral edge of the damper 22a is connected to the front surface of the spacer 23, and the front surface of the outer peripheral edge of the damper 22b is connected to the rear surface of the spacer 23. The inner periphery of each of the dampers 22a and 22b is connected to the outer periphery of the second voice coil 21. Furthermore, the rear surface of the outer periphery of the damper 22b is connected to the frame 3. The second damper portion 22 is connected to the second voice coil 21 on the inner periphery side and to the frame 3 on the outer periphery side, thereby connecting the second voice coil 21 and the frame 3 and supporting the second voice coil 21 so that it can vibrate in the direction of the central axis O1. The vibration direction of the second voice coil 21 is the same as the axial direction. The dampers 22a and 22b have a corrugated cross section and are the same shape in the attached state (the cross-sectional shapes overlap when moved in parallel in the axial direction). This makes it possible to set the interval between the dampers 22a and 22b small, improving the ease of assembly.

[0038] The diaphragm 12 and the first damper section 14 have their respective inner peripheries adhered and fixed to the outer periphery surface of the first bobbin 111 by an adhesive. The diaphragm 12 and the first damper section 14 have their respective outer peripheries adhered and fixed to the frame 3 by an adhesive. The dampers 22a, 22b of the second damper section 22 of the second driving section 20 have their respective inner peripheries adhered and fixed to the outer periphery surface of the second bobbin 211 by an adhesive. The dampers 22a, 22b have their respective outer peripheries adhered and fixed to the frame 3 by an adhesive. The other connection sections of the first driving section 10 and the second driving section 20 are basically also adhered and fixed by an adhesive.

[0039] The magnetic circuit 30 includes a top plate 31 (first magnetic member), a first magnet 32, a first yoke 33 (middle magnetic member), a second magnet 34, and a second yoke 35 (second magnetic member), and is disposed in the center of the speaker device 1 and at the rear of the first driving unit 10. These are arranged in layers from the rearmost second yoke 35 toward the front in the vibration direction of the first voice coil 11 and the second voice coil 21, in the order of the second magnet 34, the first yoke 33, the first magnet 32, and the top plate 31. The top plate 31, the first yoke 33, and the second yoke 35 are magnetic members. The magnetic circuits of the first driving unit 10 and the second driving unit 20 are formed by one magnetic circuit 30, and the magnetic circuit 30 is stacked from the rear in this manner, thereby improving the ease of assembly in the manufacturing process. In addition, both the first magnet 32 ​​and the second magnet 34 are arranged radially inward from the second voice coil 21. In this case, the radial size of the second magnet 34 is larger than the radial size of the first magnet 32. This makes it possible to increase the magnetic flux density of the second magnetic gap G2a, which will be described later, even in the second voice coil 21, which has a larger diameter and is heavier than the first voice coil 11. Note that the radial sizes of the first magnet 32 ​​and the second magnet 34 may be the same, or may have a different size relationship from that in the embodiment.

[0040] The second yoke 35 has a bottomed cylindrical shape with one side open, a disk-shaped second bottom 35a coaxial with the central axis O1, a second cylindrical part 35b standing from the outer periphery of the second bottom 35a, and a columnar second protrusion 35c protruding forward from the center of the second bottom 35a. In this embodiment, as shown in FIG. 2, the second yoke 35 has a recess on the bottom surface (rear surface) of the second bottom 35a for weight reduction and centering during processing. The second magnet 34 has a columnar shape coaxial with the central axis O1 and approximately the same diameter as the second protrusion 35c, and is stacked on the top surface (front surface) of the second protrusion 35c. In addition, an attachment flange is formed on the outer periphery of the front end of the second cylindrical part 35b, and the attachment flange is connected to the rear end of the frame 3.

[0041] The first yoke 33 is basically a shape obtained by reducing the diameter of the second yoke 35, and has a disk-shaped first bottom 33a coaxial with the central axis O1, a first cylindrical portion 33b standing from the periphery of the first bottom 33a, and a cylindrical first protrusion 33c protruding forward from the center of the first bottom 33a. The first yoke 33 is stacked on the top surface (front surface) of the second magnet 34. The first magnet 32 ​​is cylindrical, coaxial with the central axis O1 and with approximately the same diameter as the first protrusion 33c, and stacked on the top surface (front surface) of the first protrusion 33c. The top plate 31 is cylindrical, slightly larger in diameter than the first magnet 32, and stacked on the top surface (front surface) of the first magnet 32.

[0042] The second cylindrical portion 35b extends forward up to the vicinity of the top surface (front surface) of the first bottom portion 33a. The first bottom portion 33a has a protrusion 33d that protrudes radially outward from the outer circumferential surface of the first cylindrical portion 33b, i.e., toward the second cylindrical portion 35b.

[0043] The first cylindrical portion 33b extends to the top surface (front surface) of the top plate 31. The outer diameters of the top plate 31, the first magnet 32, and the first protruding portion 33c are smaller than the inner diameter of the first cylindrical portion 33b. As shown in FIG. 2, an annular first gap G1 is formed on the radial inside of the first cylindrical portion 33b between the inner peripheral surface of the first cylindrical portion 33b and the outer peripheral surfaces of the top plate 31, the first magnet 32, and the first protruding portion 33c, the first gap G1 extending from the front end of the first cylindrical portion 33b to the top surface (front surface) of the first bottom portion 33a. In the first gap G1, a first magnetic gap G1a formed between the outer peripheral surface of the top plate 31 and the inner peripheral surface of the first cylindrical portion 33b generates a magnetic field that is substantially uniform in the circumferential direction.

[0044] Similarly, the outer diameters of the first bottom 33a, the second magnet 34, and the second protrusion 35c are smaller than the inner diameter of the second cylindrical portion 35b. As shown in Fig. 2, an annular second gap G2 is formed on the radial inside of the second cylindrical portion 35b between the inner peripheral surface of the second cylindrical portion 35b and the outer peripheral surfaces of the first bottom 33a, the second magnet 34, and the second protrusion 35c, which extends from the tip of the second cylindrical portion 35b to the top surface (front surface) of the second bottom 35a. In the second gap G2, a magnetic field that is substantially uniform in the circumferential direction is generated in a second magnetic gap G2a formed by the outer peripheral surface of the first bottom 33a (the outer peripheral surface of the protrusion 33d) and the inner peripheral surface of the second cylindrical portion 35b. In this embodiment, by adjusting the amount of protrusion of the protrusion 33d of the first bottom 33a, the spacing of the second magnetic gap G2a can be narrowed, thereby increasing the magnetic flux passing through the second magnetic gap G2a and reducing the leakage magnetic flux.

[0045] Fig. 3 is an explanatory diagram showing the arrangement of the magnetized surfaces of magnets and the direction of the magnetic field of the magnetic circuit according to the first embodiment of the present invention. Specifically, it is an explanatory diagram showing the magnetic polarity arrangement of the magnetized surfaces of the first magnet 32 ​​and the second magnet 34 in the laminated structure of the magnetic circuit 30, and the direction of the magnetic field of the magnetic circuit 30 generated by said arrangement. Note that in Fig. 3, the hatching showing the cross section of the magnetic circuit 30 has been removed to make the explanatory arrows and text easier to see.

[0046] The first magnet 32 ​​and the second magnet 34 are, for example, permanent magnets, and are magnetized in the axial direction. That is, if the disk surface (magnetized surface) on one side of the first magnet 32 ​​and the second magnet 34 is an S pole, the disk surface (magnetized surface) on the other side is an N pole. In the magnetic circuit 30, in a stacked state as shown in FIG. 3, the magnetized surface on one side of the first magnet 32 ​​(the front magnetized surface, N pole) is connected to the bottom surface (rear surface) of the top plate 31, and the magnetized surface on the other side of the first magnet 32 ​​(the rear magnetized surface, S pole) is connected to the top surface (front surface) of the first protrusion 33c of the first yoke 33. The magnetized surface (front magnetized surface, S pole) of the second magnet 34 is connected to the bottom surface (rear surface) of the first bottom portion 33a of the first yoke 33, which is a surface different from the surface to which the first magnet 32 ​​of the first yoke 33 is connected, and the magnetized surface (rear magnetized surface, N pole) of the second magnet 34 is connected to the top surface (front surface) of the second protrusion 35c of the second yoke 35. In this manner, the magnetic circuit 30 has the first yoke 33 that is connected to the first magnet 32 ​​and is connected to the second magnet 34 on a surface different from the first magnet 32. In the speaker device 1 of the first embodiment, the magnetic circuit 30 forms a repulsive magnetic circuit in which the first magnet 32 ​​and the second magnet 34 are arranged so that the same poles (S poles in FIG. 3) face each other in a magnetic circuit manner via the first yoke 33, which is a magnetic member. Note that the magnetic polarities of the first magnet 32 ​​and the second magnet 34 may be reversed, and the N poles may be arranged to face each other. Furthermore, the first magnet 32 ​​and the second magnet 34 may be arranged with the same poles facing each other, or with different poles facing each other, and the magnetization direction is not limited. For example, the magnetization directions of the first magnet 32 ​​and the second magnet 34 may be reversed, and the arrangement may be such that the S pole faces the N pole. This is true regardless of whether an internal magnet type or an external magnet type is used for the magnetic circuit.

[0047] 3, two magnetic flux flows are generated in the magnetic circuit 30 of the speaker device 1: a magnetic flux flow (arrow A) from the top plate 31 through the first magnetic gap G1a toward the first cylindrical portion 33b and the first convex portion 33c of the first yoke 33, and a magnetic flux flow (arrow B) from the second convex portion 35c of the second yoke 35 through the second cylindrical portion 35b and the second magnetic gap G2a toward the first bottom portion 33a of the first yoke 33. In this case, since the magnetic field directions are aligned at the first bottom portion 33a where the two arrows A and B overlap, the magnetic fields generated in the first magnetic gap G1a and the second magnetic gap G2a may be strengthened by using two magnets (the first magnet 32 ​​and the second magnet 34). Furthermore, the first bottom portion 33a where the two arrows A and B overlap can also be used as a plate for forming the second magnetic gap G2a, which allows for a thinner, lighter device and a reduced number of parts.

[0048] A part of the rear side of the first bobbin 111 is disposed in the first gap G1, and the first coil 112 is wound around the outer peripheral surface of the rear side disposed at the position of the first magnetic gap G1a. The first bobbin 111 is supported by the frame 3 via the first damper section 14, and can vibrate in the axial direction. Although not shown, the first coil 112 is connected to a signal transmission circuit. Therefore, a first driving force (first electromagnetic force) is generated in the first coil 112 in the axial direction by the action of an electric signal from the signal transmission circuit and a magnetic field of the first magnetic gap. Then, the first bobbin 111 vibrates together with the first coil 112 due to the first driving force, vibrating the first driving section 10. Also, the diaphragm 12 vibrates together with the first bobbin 111, and thus sound is emitted. At this time, a first excitation force is generated in the speaker device 1 in response to the vibration of the first driving section. This first excitation force causes the housing fixed to the speaker device 1 to vibrate.

[0049] The second bobbin 211 has a part of its rear side disposed in the second gap G2, and the second coil 212 is wound around the outer circumferential surface of the rear side disposed at the position of the second magnetic gap G2a. The second coil 212 is wound in the same direction as the first coil 112. Here, "wound in the same direction" means that the direction of the current flowing through the first coil 112 (clockwise or counterclockwise) is the same as the direction of the current flowing through the second coil 212 when the speaker device 1 is viewed from the front side. The second bobbin 211 is supported by the frame 3 via the second damper section 22, and can vibrate in the axial direction. The second coil 212 is connected to the same signal transmission circuit as the first coil 112, and a second driving force (second electromagnetic force) is generated in the axial direction by the action of an electric signal from the signal transmission circuit and the magnetic field of the second magnetic gap. The second driving force causes the second bobbin 211 to vibrate together with the second coil 212, causing the second driving section 20 to vibrate. At this time, the speaker device 1 generates a second excitation force in response to the vibration of the second driving unit. Here, since the direction of the radial magnetic flux of the second magnetic gap is opposite to the direction of the radial magnetic flux of the first magnetic gap, the second excitation force is opposite to the first excitation force in the axial direction at the same time. Therefore, the first excitation force and the second excitation force are also generated in opposite axial directions at the same time. In addition, in order to make the second excitation force equivalent to the first excitation force at the same time, adjustments such as increasing or decreasing the weight are made by adding a weight to the second driving unit 20, increasing or decreasing the number of turns of the second coil 212, or setting the material, size, etc. of the second voice coil 21 and the dampers 22a and 22b. Here, the second excitation force being equivalent to the first excitation force does not necessarily have to be strictly the same, and may have a width to the extent that a counterbalancing effect is obtained. In this way, the second vibrational force is generated in the axially opposite direction and equally to the first vibrational force, so that the first vibrational force is cancelled out and the vibration of the speaker device 1 is suppressed.

[0050] The material of each part of the first driving part 10 and the second driving part 20 is not particularly limited. For example, the diaphragm 12, the first damper part 14, the dampers 22a and 22b, and the center cap 15 can be made of various materials such as paper, resin, metal, or a composite material and ceramics that combines these materials. The edge part 13 can be made of a relatively highly elastic polymer material such as rubber or resin. In addition, a fiber material may be used as the material of each part of the first driving part 10 and the second driving part 20. Furthermore, the base material of each part of the first driving part 10 and the second driving part 20 may be coated with a rubber coat or the like. The frame 3 and the spacer 23 can be made of a resin, paper, or metal material.

[0051] The diameters and thicknesses of each member shown in each drawing are merely examples, and the shapes and dimensions are not limited to these.

[0052] In the speaker device 1, the minimum resonance frequency of the second drive unit 20 is set so that the minimum resonance frequency of the second drive unit 20 is the same as the minimum resonance frequency of the first drive unit 10 when the first drive unit 10 and the second drive unit 20 are housed inside the housing. The housing may be formed of a part of the vehicle, and the form is not limited. The minimum resonance frequency of the second drive unit 20 is usually higher when the speaker device 1 is housed in the housing, so that the minimum resonance frequency of the second drive unit 20 is set lower than the minimum resonance frequency of the first drive unit 10 in the state of the speaker device 1 alone. Here, "the minimum resonance frequency of the second drive unit 20 is the same as the minimum resonance frequency of the first drive unit 10" does not necessarily have to be exactly the same, and it is sufficient that the minimum resonance frequency of the second drive unit 20 is within a certain range around the minimum resonance frequency of the first drive unit 10, for example, within a range of ±20%. By having the minimum resonance frequency of the first drive unit 10 and the minimum resonance frequency of the second drive unit 20 be the same, it is possible to more reliably prevent resonance occurring in the housing.

[0053] 4 is an explanatory diagram showing the amplitude of the damper of the speaker device according to the first embodiment of the present invention. Hereinafter, with reference to the drawing, details of the first damper section 14 and the positional relationship when the first damper section 14 and the second voice coil 21 are closest to each other will be described.

[0054] The shape of the first damper section 14 will be described. The first damper section 14 is composed of an inner peripheral section 141, a recessed section 142, an intermediate section 143, and an outer peripheral section 144. The inner peripheral section 141 is connected to the outer peripheral surface of the first bobbin 111, and the outer peripheral section 144 is connected to the frame 3. The recessed section 142 is disposed axially opposite the second voice coil 21, and has a large recessed shape when viewed axially forward from the second voice coil 21 side. The intermediate section 143 has a so-called corrugated shape with a wave-shaped cross section.

[0055] When the first driving section 10 and the second driving section 20 are at the midpoint of their amplitudes (or when no electric signal is applied), the recessed section 142 is located on an extension line of the vibration direction of the second voice coil 21, farther away from the second voice coil 21 than the intermediate section 143, which is another part of the first damper section 14. Specifically, as shown in Fig. 4, when a plane perpendicular to the axial direction including a position B1 indicating the front end of the second voice coil 21 is used as a reference, a distance h1 to a plane perpendicular to the axial direction including the front end of the recessed section 142 is greater than a distance h2 to a plane perpendicular to the axial direction including the front end of the intermediate section 143.

[0056] Moreover, the recessed portion 142 has a higher rigidity than the intermediate portion 143, which is the other portion of the first damper portion 14. For example, the recessed portion 142 alone can be made into a double structure by overlapping a reinforcing member of the same shape, thereby increasing the thickness and improving the rigidity. The material of the reinforcing member may be the same as that of the recessed portion 142, or may be a different material. This makes the recessed portion 142 less likely to deform than other portions such as the intermediate portion 143. The rigidity may be increased by adding a rib or the like to the recessed portion 142, or by forming the recessed portion 142 from a material having a higher rigidity than the intermediate portion 143.

[0057] Next, the positional relationship when the first damper section 14 and the second voice coil 21 are closest to each other will be described. When the first driving section 10 and the second driving section 20 are at the midpoint of the amplitude, the connection point between the first damper section 14 and the first voice coil 11 is at position A1 shown in FIG. 4, and the front end of the second voice coil 21 is at position B1. When an electric signal is applied to the first voice coil 11 and the second voice coil 21, and the first damper section 14 and the second voice coil 21 are closest to each other, the connection point between the first damper section 14 and the first voice coil 11 is at position A2, and the front end of the second voice coil 21 is at position B2. That is, the front end, which is a part of the second voice coil 21, is located in the recessed portion 142 when the first damper section 14 and the second voice coil 21 are closest to each other. 4, the front end of the second voice coil 21 is not in contact with the recessed portion 142, and it can be seen that the first driving portion 10 and the second driving portion 20 do not interfere with each other. The recessed portion 142 is also designed not to interfere with the diaphragm 12.

[0058] In the speaker device 1 configured in this manner, the diameter of the second voice coil 21 is made closer to that of the first voice coil 11, so that the magnetic circuit 30 that generates a magnetic field that vibrates the first driving unit 10 and the second driving unit 20 can be housed within the frame 3 and can be made into a laminated structure in the axial direction (vibration direction), improving the ease of assembly during manufacturing. In addition, by making the diameter of the second voice coil 21 closer to that of the first voice coil 11, the radial lengths of the first damper unit 14 and the second damper unit 22 become equal, and the second voice coil 21 can also ensure an amplitude amount equal to that of the first voice coil 11. That is, the second driving unit 20 can generate a vibration damping force sufficient to offset the vibration (excitation force) transmitted from the first driving unit 10 to the entire speaker device 1 via the frame 3. This improves the vibration damping characteristics while maintaining the quality of sound, particularly bass reproduction.

[0059] Also, by forming a repulsive magnetic circuit with the first magnet 32 ​​and the second magnet 34, the magnetic flux density of the first magnetic gap G1a and the second magnetic gap G2a becomes higher than in the case of only the first magnet 32, improving the responsiveness to the electric signals of the first drive unit 10 and the second drive unit 20. Furthermore, the first bottom portion 33a of the first yoke 33 disposed between these two magnets can be used as a path for both the magnetic flux passing through the first magnetic gap G1a and the magnetic flux passing through the second magnetic gap G2a, and the magnetic circuit 30 can be made thinner.

[0060] In addition, the first driving unit 10 and the second driving unit 20 are fixed to the frame 3 on their outer periphery, but since their inner periphery vibrates together with the first voice coil 11 and the second voice coil 21, the amount of forward and backward movement increases toward the inside in the radial direction. In this case, the more the second voice coil 21 that vibrates forward and backward is positioned on the outer periphery side, the less likely the second voice coil 21 will interfere with the first damper unit 14 or the diaphragm 12 when the amplitude of the first voice coil 11 and the second voice coil 21 becomes maximum. On the other hand, the closer the diameter of the second voice coil 21 is to the diameter of the first voice coil 11, that is, the more the second voice coil 21 is positioned on the inner periphery side, the more likely the second voice coil 21 will interfere with the first damper unit 14 or the diaphragm 12 when the amplitude of the first voice coil 11 and the second voice coil 21 becomes maximum. On the other hand, since the first damper section 14 has the recessed portion 142, even if the second voice coil 21 is disposed adjacent to the first voice coil 11, the second voice coil 21 does not interfere with the first damper section 14 or the diaphragm 12. Therefore, the second voice coil 21 can be made thin while securing the same amplitude as the first voice coil 11 and improving the sound quality. In addition, since the recessed portion 142 has high rigidity and is difficult to deform, the relative position with the second voice coil 21 does not shift, and contact with the second voice coil 21 can be reliably avoided. Furthermore, since the first bottom portion 33a of the first yoke 33 can also be used as a plate for forming the second magnetic gap G2a, the thickness can be reduced and the weight can be reduced by reducing the number of parts. And, since the first magnet 32 ​​and the second magnet 34 are stacked radially inward from the second voice coil 21, the second magnet 34 can be made the minimum size necessary and the weight can be reduced.

[0061] In this way, the speaker device 1 of the first embodiment can be easily assembled during manufacturing, and can improve vibration damping characteristics while maintaining the quality of sound reproduction, especially bass sound reproduction. In addition, it is possible to achieve both improved vibration damping characteristics and a slim design.

[0062] Second embodiment In the speaker device 1 of the first embodiment described above, both the first magnet 32 ​​and the second magnet 34 were positioned radially inward from the second voice coil 21, but the speaker device 2 of the second embodiment is different in that the second magnet 134 is annular and thus positioned radially outward from the second voice coil 21.

[0063] Fig. 5 is a perspective view of the speaker device 2 according to the second embodiment, and Fig. 6 is a side cross-sectional view in the XZ plane including the central axis O2 of the speaker device 2. The speaker device 2 according to the second embodiment will be described below with reference to these drawings. Note that the same components as those of the speaker device 1 according to the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0064] The speaker device 2 of this embodiment is a cone-type speaker, and the main part is symmetrical with respect to the central axis O2 as shown in Fig. 6. In the following description, the direction parallel to the central axis O2 is defined as the axial direction, and the front-rear direction and the radial direction are defined as in the first embodiment. The speaker device 2 radiates sound forward from the first driving unit 10. The speaker device 2 is, for example, a woofer or subwoofer, and is capable of reproducing low-pitched sounds with a large input.

[0065] The frame 103 has a cross-sectional concave shape whose diameter gradually decreases toward the rear, and the rear end of the frame 103 is connected to a second top plate 135 of the magnetic circuit 130, which will be described later. The magnetic circuit 130 includes a first top plate 131 (first magnetic member), a first magnet 132, a first yoke 133F and a second yoke 133R (intermediate magnetic members), a second magnet 134, and a second top plate 135 (second magnetic member). The first magnet 132 is disposed radially inward from the second voice coil 21, and the second magnet 134 is disposed radially outward from the second voice coil 21. Therefore, in the radial center of the speaker device 2, the components are stacked coaxially toward the front in the vibration direction of the first voice coil 11 and the second voice coil 21 in the order of the second yoke 133R disposed at the rearmost position, the first yoke 133F, the first magnet 132, and the first top plate 131. Moreover, on the radial outside of the speaker device 2, the components are stacked coaxially in the vibration direction of the first voice coil 11 and the second voice coil 21, in the order of the second yoke 133R located at the rear end, the second magnet 134, and the second top plate 135. By stacking the magnetic circuit 130 from the rear in this manner, the assembling performance in the manufacturing process is improved. The first top plate 131, the first yoke 133F, the second yoke 133R, and the second top plate 135 are magnetic members. Moreover, the first yoke 133F and the second yoke 133R are formed of, for example, the same material and are connected to each other, so that they act as an integrated magnetic member (hereinafter, referred to as the intermediate magnetic member 133). Moreover, the radial size of the inner diameter and the outer diameter of the second magnet 134 is larger than the radial size of the outer diameter of the first magnet 132. This increases the magnetic flux density of the second magnetic gap G12a acting on the second voice coil 21, which has a larger diameter and is heavier than the first voice coil 11. The first magnet 132 and the second magnet 134 may have a different size relationship from that of the embodiment. In particular, in the second embodiment, there is more space in the radial direction than in the first embodiment, making it easier to make the second magnet 134 larger. Therefore, it is also possible to use a low-cost magnet that has a smaller magnetic force relative to its size than in the first embodiment.

[0066] The second yoke 133R has a disk-shaped second bottom 133Ra coaxial with the central axis O2 and a cylindrical second protruding portion 133Rc protruding forward from the center of the second bottom 133Ra. In this embodiment, as shown in FIG. 6, the second yoke 133R has a recess on the bottom surface (rear surface) of the second bottom 133Ra for weight reduction and centering during processing. The second magnet 134 is coaxial with the central axis O2, has an inner diameter larger than the outer diameter of the second protruding portion 133Rc, and has an outer diameter slightly larger than the outer diameter of the second bottom 133Ra, and is laminated on the top surface (front surface) of the outer periphery of the second bottom 133Ra. The second top plate 135 has an inner diameter larger than the outer diameter of the first yoke 133F and an outer diameter slightly smaller than the outer diameter of the second magnet 134, and is laminated on the top surface (front surface) of the second magnet 134.

[0067] The first yoke 133F has a disk-shaped first bottom 133Fa coaxial with the central axis O2, a first cylindrical portion 133Fb standing from the periphery of the first bottom 133Fa, and a columnar first protrusion 133Fc protruding forward from the center of the first bottom 133Fa. The first yoke 133F is laminated on the top surface (front surface) of the second protrusion 133Rc. The first magnet 132 is columnar in shape, coaxial with the central axis O2, and has approximately the same diameter as the first protrusion 133Fc, and is laminated on the top surface (front surface) of the first protrusion 133Fc. The first top plate 131 is columnar in shape, slightly larger in diameter than the first magnet 132, and is laminated on the top surface (front surface) of the first magnet 132.

[0068] The second top plate 135 has an axial length (thickness) approximately equal to the axial length (thickness) of the first bottom portion 133Fa, and is disposed adjacent to the radially outer side of the first bottom portion 133Fa. The first bottom portion 133Fa has a protrusion 133Fd that protrudes radially outward from the outer circumferential surface of the first cylindrical portion 133Fb, i.e., toward the second top plate 135. An attachment flange is formed on the outer periphery of the front end of the second top plate 135, and the attachment flange is connected to the rear end of the frame 103.

[0069] The first cylindrical portion 133Fb extends to the top surface (front surface) of the first top plate 131. The outer diameters of the first top plate 131, the first magnet 132, and the first protruding portion 133Fc are smaller than the inner diameter of the first cylindrical portion 133Fb. Therefore, as shown in FIG. 6, an annular first gap G11 is formed on the radial inside of the first cylindrical portion 133Fb between the inner peripheral surface of the first cylindrical portion 133Fb and the outer peripheral surfaces of the first top plate 131, the first magnet 132, and the first protruding portion 133Fc, the first gap G11 extending from the front end of the first cylindrical portion 133Fb to the top surface (front surface) of the first bottom portion 133Fa. In the first gap G11, a magnetic field that is substantially uniform in the circumferential direction is generated in a first magnetic gap G11a formed by the outer peripheral surface of the first top plate 131 and the inner peripheral surface of the first cylindrical portion 133Fb.

[0070] The outer diameters of the first bottom 133Fa and the second protrusion 133Rc are smaller than the inner diameter of the second magnet 134 and the inner diameter of the second top plate 135. Therefore, as shown in FIG. 6, an annular second gap G12 is formed, which is surrounded by the first bottom 133Fa, the second protrusion 133Rc, the second protrusion 133Rc, the second bottom 133Ra, the second magnet 134, and the second top plate 135 and reaches from the front end of the second top plate 135 to the top surface (front surface) of the second bottom 133Ra. In the second gap G12, a substantially uniform magnetic field is generated in the circumferential direction in the second magnetic gap G12a formed by the outer peripheral surface of the first bottom 133Fa and the inner peripheral surface of the second top plate 135. In this embodiment, the interval of the second magnetic gap G12a is narrowed by adjusting the protrusion amount of the protrusion 133Fd of the first bottom 133Fa. This makes it possible to increase the magnetic flux passing through the second magnetic gap G12a and reduce the leakage magnetic flux.

[0071] 7 is an explanatory diagram showing the arrangement of the magnetized surfaces of magnets and the direction of the magnetic field of the magnetic circuit according to the second embodiment of the present invention. Specifically, it is an explanatory diagram showing the magnetic polarity arrangement of the magnetized surfaces of the first magnet 132 and the second magnet 134 in the laminated structure of the magnetic circuit 130, and the direction of the magnetic field of the magnetic circuit 130 generated by this arrangement.

[0072] The first magnet 132 and the second magnet 134 are, for example, permanent magnets, and are magnetized in the axial direction. That is, if the disk surface on one side of the first magnet 132 and the second magnet 134 is an S pole, the disk surface on the other side is an N pole. In the magnetic circuit 130, as shown in Fig. 7, in a stacked state, the magnetized surface on one side of the first magnet 132 (the front magnetized surface, N pole) is connected to the bottom surface (rear surface) of the first top plate 131, and the magnetized surface on the other side of the first magnet 132 (the rear magnetized surface, S pole) is connected to the first convex portion 133Fc of the first yoke 133F, i.e., the top surface (front surface) of the intermediate magnetic member. Then, the magnetized surface (rear magnetized surface, S pole) of the second magnet 134 is connected to the top surface (front surface) of the outer periphery of the second bottom portion 133Ra of the second yoke 133R, which is a surface different from the surface to which the first magnet 132 of the intermediate magnetic member is connected, and the magnetized surface (front magnetized surface, N pole) of the second magnet 134 is connected to the bottom surface (rear surface) of the second top plate 135. In this way, in the speaker device 2 of the second embodiment, the magnetic circuit 130 forms a repulsive magnetic circuit in which the first magnet 132 and the second magnet 134 are arranged so that the same poles (S poles in FIG. 7) face each other in a magnetic circuit manner via three layers of magnetic members (the first top plate 131, the intermediate magnetic member consisting of the first yoke 133F and the second yoke 133R, and the second top plate 135). Note that the magnetic polarities of the first magnet 132 and the second magnet 134 may be reversed, and the N poles may be arranged to face each other. Furthermore, the first magnet 132 and the second magnet 134 may be arranged with the same poles facing each other, or with different poles facing each other, and the magnetization direction is not limited. For example, the magnetization directions of the first magnet 132 and the second magnet 134 may be reversed, and the arrangement may be such that the S pole faces the N pole. This is true regardless of whether an internal magnet type or an external magnet type is used for the magnetic circuit.

[0073] 7, two magnetic flux flows are generated in the magnetic circuit 130 of the speaker device 2: a magnetic flux flow (arrow C) from the first top plate 131 through the first magnetic gap G11a toward the first cylindrical portion 133Fb and the first bottom portion 133Fa of the first yoke 133F, and a magnetic flux flow (arrow D) from the second top plate 135 through the second magnetic gap G12a toward the first bottom portion 133Fa, the second convex portion 133Rc, and the second bottom portion 133Ra. In particular, in the portion where the two arrows C and D overlap, the magnetic field directions are aligned, so that by using two magnets (the first magnet 132 and the second magnet 134), the magnetic fields generated in the first magnetic gap G11a and the second magnetic gap G12a may be strengthened. In this case, the direction of the magnetic flux flow in the first magnetic gap G11a and the direction of the magnetic flux flow in the second magnetic gap G12a are opposite to each other with respect to the radial direction, similar to the first embodiment.

[0074] In the speaker device 2 configured in this manner, the diameter of the second voice coil 21 is made closer to that of the first voice coil 11, and the magnetic circuit 130 constituting the first driving section 10 and the second driving section 20 is stored within the frame 103 while being laminated in the axial direction (vibration direction), thereby improving the ease of assembly during manufacturing. In addition, by making the diameter of the second voice coil 21 closer to that of the first voice coil 11, the radial lengths of the first damper section 14 and the second damper section 22 become equal, and the second voice coil 21 can also ensure an amplitude amount equal to that of the first voice coil 11. That is, in the second driving section 20, a vibration damping force sufficient to offset the vibration (excitation force) transmitted from the first driving section 10 to the entire speaker device 2 via the frame 103 can be generated. This improves the vibration damping characteristics while maintaining the quality of the sound, particularly the bass reproduction.

[0075] In addition, by forming a repulsive magnetic circuit using the first magnet 132 and the second magnet 134, the magnetic flux density of the first magnetic gap G11a and the second magnetic gap G12a becomes higher than that of the first magnet 132 alone, and the responsiveness of the first driving unit 10 and the second driving unit 20 to the electric signal is improved. Furthermore, the first bottom portion 133Fa disposed between these two magnets can be used as a passage for both the magnetic flux passing through the first magnetic gap G11a and the magnetic flux passing through the second magnetic gap G12a, so that the diameter of the second voice coil 21 can be made closer to the diameter of the first voice coil 11 while the first voice coil 11 is disposed more centrally to obtain a sufficient amplitude. At the same time, the number of parts of the magnetic circuit 130 can be reduced and the thickness can be reduced.

[0076] In addition, the first driving unit 10 and the second driving unit 20 are fixed to the frame 103 on their outer periphery, but since the inner periphery vibrates together with the first voice coil 11 and the second voice coil 21, the amount of forward and backward movement increases toward the inside. In this case, the more the second voice coil 21, which vibrates forward and backward, is positioned on the outer periphery side, the less likely the second voice coil 21 will interfere with the first damper unit 14 or the diaphragm 12 when the amplitude of the first voice coil 11 and the second voice coil 21 becomes maximum. On the other hand, the closer the diameter of the second voice coil 21 is to the diameter of the first voice coil 11, that is, the more the second voice coil 21 is positioned on the inner periphery side, the more likely the second voice coil 21 will interfere with the first damper unit 14 or the diaphragm 12 when the amplitude of the first voice coil 11 and the second voice coil 21 becomes maximum. In contrast, since the first damper section 14 has the recessed section 142, even if the second voice coil 21 is disposed adjacent to the first voice coil 11, the second voice coil 21 does not interfere with the first damper section 14 or the diaphragm 12. Therefore, the second voice coil 21 can be made thinner while securing the same amplitude as the first voice coil 11 and improving the sound quality. In addition, since the recessed section 142 has high rigidity and is less likely to deform, the relative position with the second voice coil 21 does not shift, and contact with the second voice coil 21 can be reliably avoided. Furthermore, since the first bottom section 133Fa can also be used as a plate for forming the second magnetic gap G12a, the thickness can be reduced and the weight can be reduced by reducing the number of parts.

[0077] 7, when the first magnet 132 and the second magnet 134 are arranged, the magnetization direction in the axial direction is the same. Therefore, after the magnetic circuit 130 is assembled in the manufacturing process, the magnetization process of the first magnet 132 and the second magnet 134 can be performed simultaneously.

[0078] In this way, the speaker device 2 of the second embodiment can be easily assembled during manufacturing, and can improve vibration damping characteristics while maintaining the quality of audio reproduction. In addition, it is possible to achieve both improved vibration damping characteristics and a slim design.

[0079] Although the description of the first and second embodiments of the present invention is completed above, the aspects of the present invention are not limited to these embodiments.

[0080] For example, the location where the speaker device is installed is not limited to a vehicle.

[0081] In the above embodiment, the first damper section 14 and the second damper section 22 have a corrugated cross section, but may have other shapes. For example, they may be leaf springs or may have a circular arc shape instead of a corrugated shape. In the above embodiment, the dampers 22a and 22b of the second damper section 22 are the same when attached, but may have a shape that is inverted in the axial direction when attached. This improves the movement symmetry and linearity (linearity) of the second voice coil 21 during forward and backward oscillation, so that the stress is applied to each damper 22a and 22b in the same manner, and the support strength of the second voice coil 21 can be improved. In addition, the linearity of the second voice coil 21 is improved, so that the interval of the second magnetic gap G12a can be narrowed to strengthen the magnetic field.

[0082] In the above embodiment, the second damper section 22 is composed of two dampers 22a and 22b, but it may be composed of one damper. It may also be composed of three or more dampers. By configuring it with multiple dampers, the stress is applied to each damper equally, so that the movement symmetry and linearity (linearity) of the second voice coil 21 during forward and backward vibration are improved, and the support strength of the second voice coil 21 can be improved. In addition, by improving the linearity of the second voice coil 21, the interval of the second magnetic gap G12a can be narrowed to strengthen the magnetic field. Furthermore, when it is configured with multiple dampers, in the above embodiment, the spacer 23 is used to indirectly fix the dampers to the frame 3, 103 while keeping the axial intervals of the dampers, but the outer periphery of the multiple dampers may be directly connected and fixed to the frame 3, 103 with an adhesive or the like.

[0083] In the above embodiment, the first coil 112 and the second coil 212 are connected to the same signal circuit and the same electric signal is input to them, but the second coil 212 may be connected to a different signal circuit and an electric signal different from that of the first coil 112 may be input to it. For example, a first electric signal that generates a first driving force that vibrates the first voice coil 11 may be input to the first coil 112, and a second electric signal that generates a second driving force that vibrates the second voice coil 21 may be input to the second coil 212, so that the second electric signal is an electric signal that generates a second driving force equivalent to a second excitation force that cancels out the first excitation force. This allows the degree of cancellation to be finely adjusted. In the above embodiment, the winding direction of the first coil 112 and the winding direction of the second coil 212 are the same, but the winding direction may be such that the direction of the force generated in the first coil 112 by the magnetic flux crossing the first coil 112 and the current flowing through the first coil 112 is opposite to the direction of the force generated in the second coil 212 by the magnetic flux crossing the second coil 212 and the current flowing through the second coil 212, that is, the winding direction may be such that the first excitation force can be suppressed by the second excitation force. Furthermore, when the second coil 212 is connected to a signal circuit different from the first coil 112, the different signal circuit may output an electric signal in which a third electric signal that generates a third driving force equivalent to a third excitation force that suppresses vibrations generated outside the speaker devices 1 and 2 is superimposed on the second electric signal. This makes it possible to cancel vibrations generated outside the speaker devices 1 and 2.

[0084] In the first embodiment, the intermediate magnetic member is composed of one component (first yoke 33), and in the second embodiment, the intermediate magnetic member is composed of two components (first yoke 133F and second yoke 133R), but the intermediate magnetic member may be composed of multiple components including other magnetic component parts. Similarly, the first magnetic member and the second magnetic member may be composed of multiple magnetic component parts.

[0085] Furthermore, in the first and second embodiments, the first voice coil 11 and the second voice coil 21 each have a cylindrical shape with a circular cross section, but may have, for example, a polygonal or elliptical cross section. [Explanation of symbols]

[0086] 1, 2: Speaker device 3, 103: Frame 10: First drive unit 11: First voice coil 12: Vibration plate 14: First damper section 20: Second drive unit 21: Second voice coil 22: Second damper section 30, 130: Magnetic circuit 31, 131: Top plate 32, 132: 1st magnet 33, 133F: 1st York 33d, 133Fd:Protrusion 34, 134: Second magnet 35, 133R: 2nd York 135: 2nd top plate 142: Recess G1a, G11a: First magnetic gap G2a, G12a: Second magnetic gap

Claims

1. A first voice coil; A second voice coil disposed radially outward of the first voice coil; a first damper that supports the first voice coil on a frame; a second damper supporting the second voice coil on the frame; Equipped with the first damper has a recessed portion on an extension line of a vibration direction of the second voice coil, the recessed portion being spaced apart from the second voice coil more than other portions of the first damper; Speaker device.

2. The second voice coil is capable of vibrating in a direction opposite to that of the first voice coil.

2. The speaker device according to claim 1.

3. When the first damper and the second voice coil are closest to each other, a portion of the second voice coil is located within the recess.

3. The speaker device according to claim 1 or 2.

4. The second damper is composed of a plurality of support members arranged in the vibration direction.

4. The speaker device according to claim 1.

5. a magnetic circuit having a first magnet and a second magnet; The first magnet and the second magnet are arranged side by side in the vibration direction.

5. The speaker device according to claim 1.

6. A first voice coil; A second voice coil disposed radially outward of the first voice coil; a first damper that supports the first voice coil on a frame; a second damper supporting the second voice coil on the frame; a magnetic circuit having a first magnet and a second magnet; Equipped with The first magnet and the second magnet are arranged side by side in a vibration direction of the first voice coil. Speaker device.

7. the magnetic circuit has an intermediate magnetic member connected to the first magnet and connected to the second magnet on a surface different from that of the first magnet; 7. The speaker device according to claim 6.

8. the intermediate magnetic member forms a first magnetic gap in which the first voice coil is disposed and a second magnetic gap in which the second voice coil is disposed.

8. The speaker device according to claim 7.

9. the magnetic circuit includes the first magnet and a first magnetic member connected to the intermediate magnetic member on different surfaces, The first magnetic gap is formed between the intermediate magnetic member and the first magnetic member.

9. The speaker device according to claim 8.

10. the magnetic circuit includes the second magnet and a second magnetic member connected to the intermediate magnetic member on different surfaces; The second magnetic gap is formed between the intermediate magnetic member and the second magnetic member.

10. The speaker device according to claim 9.

11. The first magnet and the second magnet are disposed radially inside the second voice coil.

11. The speaker device according to claim 6.

12. the first magnet is disposed radially inside the first voice coil, the second magnet is disposed radially outward of the second voice coil, the intermediate magnetic member has a central portion connected to the first magnet and an outer circumferential portion connected to the second magnet, the first magnet is connected to the central portion of the intermediate magnetic member, The second magnet is connected to the outer periphery of the intermediate magnetic member.

11. The speaker device according to claim 7.

13. the first damper has a recessed portion on an extension line of a vibration direction of the second voice coil, the recessed portion being spaced apart from the second voice coil more than other portions of the first damper; 13. A speaker device according to claim 6.

14. The recessed portion has a higher rigidity than other portions of the first damper.

14. A speaker device according to claim 1, 2, 3, 4, 5, or 13.

15. the intermediate magnetic member has a protrusion that protrudes radially outward and forms the second magnetic gap; 9. The speaker device according to claim 8.

16. a first driving unit including the first voice coil, a diaphragm connected to the first voice coil, and the first damper; a second driving section having the second voice coil and the second damper, a second vibration force generated in the speaker device in response to the vibration of the second driving unit is in the opposite direction to a first vibration force generated in the speaker device in response to the vibration of the first driving unit at the same time; 16. A speaker device according to claim 1.

17. a housing that accommodates the first drive unit and the second drive unit therein; The lowest resonance frequency of the second drive unit is the same as the lowest resonance frequency of the first drive unit.

17. The speaker device according to claim 16.

18. the second electrical signal that vibrates the second voice coil is different from the first electrical signal that vibrates the first voice coil; 18. A speaker device according to claim 1.

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