Speaker device

Abstract

To make a speaker device thin or compact.SOLUTION: The speaker device includes a frame 11 having an outer peripheral cylindrical part side 11A, and a yoke 33, and at least a part of the yoke 33 is positioned inside the frame 11, the outer peripheral cylindrical part side 11A has one or a plurality of recessed part side 11A2, and a part of the yoke 33 is positioned in the recessed part.SELECTED DRAWING: Figure 11

Description

[Technical Field]

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

[0002] A speaker device basically comprises a diaphragm, a voice coil, and a magnetic circuit. The conventional speaker device described in Patent Document 1 below has a relatively flat diaphragm body made of foamed mica or the like, and the outer periphery of the diaphragm is supported by a frame via an edge. A voice coil is provided on the underside of the diaphragm body, and the voice coil is positioned within the magnetic gap of the magnetic circuit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 62-147991 Summary of the Invention [Problem to be solved by the invention]

[0004] Speaker devices are installed in various electronic devices that generate sound. When installed in portable electronic devices, for example, the speaker devices are required to be thin and compact in order to improve portability.

[0005] An object of the present invention is to make the speaker device thinner or smaller. [Means for solving the problem]

[0006] In order to achieve this object, a speaker device according to the present invention has at least the following configuration. A speaker device comprising: a frame having an outer cylindrical portion; and a magnetic circuit having a yoke, at least a portion of which is located inside the frame, wherein the outer cylindrical portion has one or more recesses, and a portion of the yoke is located in the recesses. [Brief explanation of the drawings]

[0007] [Figure 1] 1A and 1B are explanatory diagrams illustrating a speaker device according to an embodiment of the present invention (FIG. 1A is a longitudinal sectional view, and FIG. 1B is an enlarged view of part A). [Figure 2] 10A and 10B are explanatory diagrams showing other forms of the vibration part of the speaker device according to the embodiment of the present invention. [Figure 3] 1 is a cross-sectional view showing the overall configuration of a speaker device according to an embodiment of the present invention. [Figure 4] FIG. 2 is a partially enlarged cross-sectional view of FIG. [Figure 5] FIG. 2 is an explanatory diagram showing details of an edge of the speaker device according to the embodiment of the present invention. [Figure 6] X1-X1 cross-sectional view of Figure 3. [Figure 7] 1A and 1B are explanatory diagrams showing the overall configuration of a magnetic circuit in a speaker device according to an embodiment of the present invention (FIG. 1A is a plan view, and FIG. 1B is a perspective view). [Figure 8] FIG. 2 is an explanatory diagram showing a magnetic circuit in the speaker device according to the embodiment of the present invention. [Figure 9] 1 is an explanatory diagram showing a mounting structure for mounting a magnetic circuit to a stationary part in a speaker device according to an embodiment of the present invention; [Figure 10] 1 is an explanatory diagram showing a mounting structure for mounting a magnetic circuit to a stationary part in a speaker device according to an embodiment of the present invention; [Figure 11] 1 is an explanatory diagram showing a mounting structure for mounting a magnetic circuit to a stationary part in a speaker device according to an embodiment of the present invention; [Figure 12] 1 is an explanatory diagram showing a mounting structure for mounting a magnetic circuit to a stationary part in a speaker device according to an embodiment of the present invention; [Figure 13] 3A and 3B are explanatory diagrams showing the structure of a terminal portion in the speaker device according to the embodiment of the present invention. [Figure 14] 3A and 3B are explanatory diagrams showing the structure of a terminal portion in the speaker device according to the embodiment of the present invention. [Figure 15] 3A and 3B are explanatory diagrams showing the structure of a terminal portion in the speaker device according to the embodiment of the present invention. [Figure 16] 1 is an external perspective view showing the overall configuration of a speaker device according to an embodiment of the present invention; [Figure 17] 1 is an external perspective view showing the overall configuration of a speaker device according to an embodiment of the present invention; [Figure 18] 1A and 1B are explanatory diagrams showing application examples of a speaker device according to an embodiment of the present invention. [Figure 19] 1A and 1B are explanatory diagrams showing application examples of a speaker device according to an embodiment of the present invention. [Figure 20] 1 is an explanatory diagram showing an example of mounting a speaker device according to an embodiment of the present invention on an electronic device; [Figure 21] 1 is an explanatory diagram showing an example of mounting a speaker device according to an embodiment of the present invention on an electronic device; [Figure 22] 1 is an explanatory diagram showing an example of mounting a speaker device according to an embodiment of the present invention on an electronic device; DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Each of the following figures is an explanatory diagram illustrating a speaker device according to an embodiment of the present invention. The same reference numerals are used for common parts in each figure, and some overlapping explanations will be omitted. The X direction in the figure is the acoustic radiation direction, and the Y direction in the figure is the radial direction (width direction) of the speaker device.

[0009] FIG. 1 is an explanatory diagram showing the basic configuration of a speaker device according to an embodiment of the present invention, in which FIG. 1(a) is a longitudinal sectional view and FIG. 1(b) is an enlarged view of part A in FIG. 1(a).

[0010] The speaker device 1 includes a stationary part 10, a vibrating part 20, and a magnetic circuit 30. The vibrating part 20 includes a vibrating body 21 having an outer circumferential part 21A, an edge 22 that supports the vibrating body 21 on the stationary part 10, and a voice coil 25 that is supported by the vibrating body 21 directly or via another member. The vibrating body 21 and the edge 22 are made of different materials. The edge 22 has a laminated structure in which multiple resin layers 22a1 and 22a2 made of resin films are laminated. The rigidity of the vibrating body 21 is greater than the rigidity of the edge 22.

[0011] In the illustrated example, the resin layers 22a1 and 22a2 of the edge 22 are two layers, but this is not limited to this. For example, the edge 22 may have multiple layers. The edge 22 can also be formed only from the multiple resin layers 22a1 and 22a2. Furthermore, as will be described later, the edge 22 can also be configured in combination with other layers. The magnetic circuit 30 is made up of a plate, a yoke, a magnet, etc., which will be described later, and forms a magnetic gap 30G, within which the voice coil 25 is disposed.

[0012] By forming the vibrating body (diaphragm) 21 and the edge 22 as separate members, the speaker device 1 can include a vibrating body 21 with greater rigidity than the edge 22, and a vibrating body 21 and edge 22 with a predetermined internal loss. In such a speaker device 1, the vibrating section 20 (vibrating body 21, edge 22) can be made relatively thin even without providing a reinforcing portion such as a rib on the vibrating body 21. Note that, if necessary, a reinforcing portion such as a rib may be provided on the vibrating body 21 as shown in FIG. 3 described later. Furthermore, by providing the edge 22 with a multi-layer structure, it can have a relatively large internal loss while having the rigidity to support the vibrating body 21 so that it can vibrate freely.

[0013] In a speaker device that is thin and compact, the diaphragm and the edge may be integrally formed. When the diaphragm and the edge are integrally formed, if the common member of the diaphragm and the edge is made of a relatively soft material, the acoustic characteristics may deteriorate in the high frequency range. On the other hand, if the common member of the diaphragm and the edge is made of a hard material, the acoustic characteristics may deteriorate in the low frequency range. It is also possible to form the common member of the diaphragm and the edge from a relatively soft material and provide a reinforcing portion such as a rib on the vibrating body to increase its rigidity. However, providing such a reinforcing portion on the vibrating body increases the thickness of the vibrating body, making it difficult to achieve a thin and compact speaker device. On the other hand, the speaker device 1 described in this embodiment can improve the acoustic characteristics in both the low and high frequencies.

[0014] According to the speaker device 1, the vibrating body 21 has a relatively large rigidity, so that the high-frequency limit frequency can be shifted outside the audible range. Also, the edge 22 has a relatively large internal loss, so that the peak at the low-frequency reproduction frequency can be made relatively small. Also, the vibrating body 21 has a relatively large internal loss, so that the peak value near the high-frequency limit frequency can be made relatively small, and the acoustic characteristics can be flattened from the low frequency range to the high frequency range.

[0015] In the example shown in FIG. 1(b), the edge 22 includes multiple resin layers 22a1 and 22a2 and a soft layer 22b that is softer than the resin layers 22a1 and 22a2. In this example, the thickness (b) of the soft layer 22b is greater than the thickness (a1+a2) of the multiple resin layers 22a1 and 22a2. The Young's modulus of the edge 22 is smaller than that of a comparison edge (having the same thickness as the edge 22) that is made of a single layer made of the same material as the resin layers 22a1 and 22a2. The internal loss of the edge 22 is greater than that of the comparison edge described above.

[0016] In the edge 22 composed of multiple resin layers 22a1, 22a2 and soft layer 22b, the soft layer 22b is thicker than the resin layers 22a1, 22a2, so the physical properties of the soft layer have a greater effect on the physical properties of the edge 22 than the resin layers 22a1, 22a2. In other words, the physical properties of the soft layer 22b are the dominant factor in the physical properties of the edge 22, and the internal loss of the edge 22 can be relatively large. This makes it possible to reduce the peak value near the low-frequency resonance frequency that appears in the acoustic characteristics, and flatten the acoustic characteristics.

[0017] The resin layers 22a1 and 22a2 of the edge 22 may be made of a common resin material. The common resin material may be at least one common resin material among the different resin materials constituting the resin layers 22a1 and 22a2. Here, the common resin material refers to resin materials having substantially the same density, Young's modulus, and internal loss. Similarly to the resin materials, the common resin material refers to resin materials having substantially the same density, Young's modulus, and internal loss. For example, if the resin layers 22a1 and 22a2 of the edge 22 are made of a common resin material (resin materials having substantially the same Young's modulus, internal loss, and density), peeling between the resin layers due to deformation caused by shrinkage of the resin material can be prevented.

[0018] Furthermore, if necessary, the multiple resin layers 22a1 and 22a2 of the edge 22 may be made of different resin materials. For example, the resin materials for the resin layers 22a1 and 22a2 may be selected so that the glass transition temperature of the resin material for the resin layer 22a1 is higher than the glass transition temperature of the resin layer 22a2. Specifically, the resin layer 22a1 may be made of a resin material containing PEEK, and the resin layer 22a2 may be made of a resin material containing PET. Alternatively, the edge 22 may have a resin layer having a resin material with a relatively high glass transition temperature disposed on the voice coil 25 side and a resin layer having a resin material with a relatively low glass transition temperature disposed on the vibrating body 21 side.

[0019] In the illustrated example, the inner circumferential portion 22A of the edge 22 is attached to the surface of the vibrating body 21 on the magnetic circuit 30 side (the surface facing the magnetic circuit 30; the back surface). The voice coil 25 is connected to the vibrating body 21 via the inner circumferential portion 22A of the edge 22. The upper end of the voice coil 25 is connected to the inner circumferential portion 22A of the edge 22.

[0020] In this example, the resin film constituting the resin layer 22a2 arranged on the voice coil side of the surround 22 has a glass transition temperature of 100°C or higher. The resin film is mainly made of a resin material with a glass transition temperature of 100°C or higher. Specifically, the resin film may be made of PEN (polyether naphthalate, glass transition temperature = 155°C), PEEK (polyether ether ketone, glass transition temperature = 143°C), PET (polyester, glass transition temperature = 115°C), or the like.

[0021] In the illustrated example, the vibrating body 21 is flat and made of a ceramic-based rigid vibrating member. Because a ceramic-based rigid vibrating member is used for the vibrating body 21, Joule heat from the voice coil 25 propagates to the edge 22 and the vibrating body 21, accumulating Joule heat in the vibrating body 21. Because Joule heat accumulates in the vibrating body 21, the temperature of the inner periphery 22A of the edge 22 rises. Unless an appropriate material is selected for the edge 22, the edge 22 will be unable to follow the vibrating body 21. In contrast, the speaker device 1 uses a resin film with a relatively high glass transition temperature as the resin layer 22a2 of the edge 22. Therefore, even if Joule heat accumulates in the vibrating body 21, the edge 22 can follow the vibrating body 21. Furthermore, by using a resin film with a relatively high glass transition temperature for the edge 22, the temperature of the edge 22 becomes relatively high. Therefore, even if the physical properties of the edge 22 change with temperature, the vibrating body 21 can be supported by the stationary portion 10 so as to be able to vibrate freely. Furthermore, by using a resin film with a relatively high glass transition temperature for the edge 22, it is possible to position the voice coil 25 in a predetermined position relative to the magnetic circuit 30 while the speaker device is being driven. Furthermore, by using a resin film with a relatively high glass transition temperature for the edge 22, it is possible to restrict the vibration of the vibrating body 21 while the speaker device is being driven. Furthermore, if the vibrating body 21 is made of a ceramic-based rigid vibration member, it becomes lightweight, and therefore it is possible to generate a relatively large sound pressure.

[0022] In the speaker device 1, by interposing the edge 22, which is relatively more flexible than the vibrating body 21, between the vibrating body 21 and the voice coil 25, it is possible to use a ceramic-based rigid vibrating member, which has relatively little strength against external impacts, for the vibrating body 21. As a result, for example, an electronic device (such as a portable electronic device) equipped with the speaker device 1 may be dropped and subjected to an impact. At this time, the voice coil 25 may come into contact with a yoke, which will be described later, of the magnetic circuit 30, and the voice coil 25 may apply a relatively large external force (impact) to the vibrating body 21. At this time, since the vibrating body 21 is connected to the voice coil 25 via the edge 22, it is possible to prevent defects such as cracks from occurring in the vibrating body 21. In addition, the edge 22 serves as a buffer member that absorbs the external force caused by the voice coil 25.

[0023] The rigid vibration member can be substantially made of carbon (for example, carbon ceramics). The rigid vibration member can also be made of a component having a foam layer with a foam structure and a covering layer that covers the foam layer. The covering layer of this rigid vibration member is a layer that is formed continuously. The density of the covering layer is greater than the density of the foam layer. The porosity of the covering layer is less than the density of the foam layer. The porosity (%) here is calculated by the following formula: (1 - [weight (g) of the foam layer or covering layer] / [density of the constituent material (g / m 3 )] / [Volume of foam layer or coating layer (m 3 )]) × 100.

[0024] The common resin member or common resin material of the multiple resin layers 22a1, 22a2 of the edge 22 can be polyether ether ketone resin, polyetherimide resin, or polyester-based resin. The soft layer 22b of the edge 22 can be made of, for example, an acrylic-based resin. If necessary, the soft layer 22b can be made of a water-dispersed resin material (emulsion-based resin) or an adhesive.

[0025] 2 is an explanatory diagram showing another form of a vibrating section provided in a speaker device according to an embodiment of the present invention. In this vibrating section 20, a vibrating body 21 and an edge 22 are connected via a voice coil support section 27. A voice coil 25 is supported on the voice coil support section 27. The density of the constituent materials of the voice coil support section 27 is set lower than the density of the constituent materials of the vibrating body 21 and the edge 22.

[0026] In the illustrated example, the vibrating body 21 has a dome shape, and the upper end of the voice coil support part 27 is connected to its outer periphery. The vibrating body 21 can be made of a different material from the edge 22, such as aluminum or magnesium. The inner periphery of the edge 22 is connected to the outer periphery side of the voice coil support part 27, and the outer periphery of the edge 22 is connected to the stationary part 10. As described above, the edge 22 can be made of a plurality of resin layers 22a1, 22a2 and a soft layer 22b. The voice coil support part 27 can be made of a lightweight material such as paper. This can improve the acoustic characteristics while reducing the size and weight of the speaker device 1.

[0027] FIG. 3 is a cross-sectional view showing the overall configuration of a speaker device according to an embodiment of the present invention, and FIG. 4 is a partially enlarged cross-sectional view thereof. The speaker device 1 includes a stationary portion 10, a vibrating portion 20, and a magnetic circuit 30. The vibrating portion 20 includes a vibrating body 21, an edge 22 that supports the vibrating body 21 on the stationary portion 10, and a voice coil 25 that is supported on the vibrating body 21 directly or via another member. The magnetic circuit 30 includes a magnetic gap 30G formed by a first magnetic pole portion 31 and a second magnetic pole portion 32, and a magnet 35 (inner magnet 35B). The voice coil 25 is disposed within the magnetic gap 30G. The vibrating portion 20 is supported by the stationary portion 10 so as to be able to vibrate freely. In FIG. 3, the first magnetic pole portion 31 is a plate 34, and the second magnetic pole portion 32 is formed by a yoke 33. The edge 22 is formed separately from the vibrating body 21 and is joined to the vibrating body 21 directly or via another member such as an adhesive. 3 shows that the edge 22 is disposed on the magnetic circuit 30 side of the upper surface of the vibrating body 21. In particular, the inner periphery of the edge 22 is bonded to the lower surface of the vibrating body 21 directly or via another member such as an adhesive.

[0028] [Structure of the vibrating part and its position relative to other parts] The vibrating body 21 itself has rigidity, and the outer circumferential portion 21A of the rigid vibrating body 21 protrudes outside the voice coil 25. By making the outer circumferential portion 21A protrude outside the voice coil 25 in this way, the edge 22 curves so as to approach the yoke 33 from a position that is separated from the voice coil 25 supported by the vibrating body 21 by the amount of protrusion of the outer circumferential portion 21A. Therefore, the vibrating body 21 has a structure in which the curved portion of the edge 22 is unlikely to interfere with the upper part of the second magnetic pole portion 32 (yoke 33) when the voice coil 25 vibrates within the magnetic gap 30G.

[0029] In the illustrated example, the outer circumferential portion 21A of the vibrating body 21 is disposed near or outside the position of the second magnetic pole portion 32 in the radial direction (Y direction in the figure). That is, as shown in FIGS. 4 and 5, the outer circumferential portion 21A of the vibrating body 21 is disposed on the wall portion 33B of the yoke 33, which becomes the second magnetic pole portion 32. Furthermore, the outer circumferential portion 21A of the vibrating body 21 extends near or outside the position of the wall portion 33B of the yoke 33. In the illustrated example, the outer circumferential portion 21A of the vibrating body 21 is disposed near or outside the position of the inner side surface of the wall portion 33B. Furthermore, without being limited to the illustrated example, the outer circumferential portion 21A may be disposed near or outside the position of the outer side surface of the wall portion 33B. In this way, when the curved portion of the edge 22 is formed from the outer circumferential portion 21A, the curved portion of the edge 22 is formed at a position outside beyond the magnetic gap 30G. Therefore, the curved portion of the edge 22 is less likely to interfere with the second magnetic pole portion 32 (yoke 33) that forms the magnetic gap 30G.

[0030] FIG. 5 shows the details of the edge 22. The edge 22 is disposed on the second magnetic pole portion 32 and includes a first curved portion 23 having a convex shape facing the acoustic radiation direction (the X direction in the figure) and a concave second curved portion 24. The second curved portion 24 is provided contiguous to the first curved portion 23. In this manner, the part of the second curved portion 24 that is contiguous to the first curved portion 23 is less likely to interfere with the second magnetic pole portion 32. Specifically, the second curved portion 24 is spaced apart from the wall portion 33B of the yoke 33 by the size of the first curved portion 23 in the radial direction, and therefore is less likely to interfere with the second magnetic pole portion 32.

[0031] The first curved portion 23 is disposed above and in the vicinity of the second magnetic pole portion 32, and the second curved portion 24 is disposed outside the first curved portion 23. As a result, the top portion 24C of the second curved portion 24 can be positioned outside (on the Y-direction side) the second magnetic pole portion 32, and it becomes possible to provide the top portion (24C) that is most likely to interfere at a position away from the second magnetic pole portion 32 (yoke 33).

[0032] The inner peripheral portion 23A of the first curved portion 23 supports the vibrating body 21. Further, the inner peripheral portion 23A of the first curved portion 23 is disposed at a higher position with respect to the second magnetic pole portion 32 than the inner peripheral portion 24A of the second curved portion 24. That is, when comparing the height h1 from the second magnetic pole portion 32 to the inner peripheral portion 24A of the second curved portion 24 and the height h2 from the second magnetic pole portion 32 to the inner peripheral portion 23A of the first curved portion 23, h1 < h2. In this way, a relatively large gap can be provided between the second magnetic pole portion 32 and the inner peripheral portion 23A of the first curved portion 23.

[0033] The edge 22 includes a top portion 23C provided between the inner peripheral portion 23A and the outer peripheral portion 23B of the first curved portion 23. The top portion 23C of the first curved portion 23 is disposed in the vicinity of the outer peripheral portion 21A of the vibrating body 21. Further, the top portion 23C of the first curved portion 23 is disposed at substantially the same height as the vibrating body 21 with respect to the magnetic circuit 30, and the inner peripheral portion 23A of the first curved portion 23 is disposed at substantially the same height as the top portion 23C of the first curved portion 23. By forming the first curved portion 23 having the top portion 23C in this way, the inner peripheral portion 24A of the second curved portion 24 can be provided at a position away from the second magnetic pole portion 32 on the vibrating body 21 side.

[0034] The first curved portion 21 has a length L1 along the radial direction. The second curved portion 24 has a length equal to the sum of lengths L2 and L3 along the radial direction. Here, length L2 is the length from the inner peripheral portion 24A to the apex 24C of the second curved portion 24, and length L3 is the length from the apex 24C to the outer peripheral portion 24B of the second curved portion 24. By providing the first curved portion 23 between the second curved portion 24 and the vibrating body 21, the apex 24C of the second curved portion 24 can be located at a distance of length L1 from the second magnetic pole portion 32. Therefore, a relatively large gap can be provided between a part of the second curved portion 24 and the second magnetic pole portion 32 in the height direction, preventing the second curved portion 24 from interfering with the second magnetic pole portion 32.

[0035] When the vibrating body 21 is at rest (when no audio current is input to the voice coil 25), the outer circumferential portion 22B of the edge 22 is disposed higher than or substantially at the same height as the inner circumferential portion 22A of the edge 22. As the voice coil 25 vibrates, the inner circumferential portion 22A of the edge 22 vibrates up and down relative to the outer circumferential portion 22B of the edge 22. In this way, by configuring the inner circumferential portion 22A of the edge 22 so that it does not protrude from the outer circumferential portion 22B of the edge 22 toward the acoustic radiation side, the speaker device 1 can be made thinner.

[0036] The second curved portion 24 has an apex 24C provided between its inner peripheral portion 24A and outer peripheral portion 24B. The apex 24C of the second curved portion 24 is disposed outward relative to the position of the second magnetic pole portion 32, and is provided at a higher position relative to the second magnetic pole portion 32. By disposing it in this manner, the apex 24C of the second curved portion 24 may approach the second magnetic pole portion 32 as the voice coil 25 vibrates, but the second curved portion 24 can be disposed so that a part of the second curved portion 24 does not come into contact with the second magnetic pole portion 32.

[0037] A distance S1 in the radial direction (Y direction in the figure) between the second magnetic pole portion 32 and a part of the stationary portion 10 supporting the edge 22 is set smaller than a distance S2 between the inner peripheral portion 22A and the outer peripheral portion 22B of the edge 22. The height of the second magnetic pole portion 32 in the vibration direction of the voice coil 25 is set lower than the height of the first magnetic pole portion 31 (there is a height difference of Δh in FIG. 4), and the distance (h3+Δh) from the vibrating body 21 to the second magnetic pole portion 32 is set larger than the distance (h3) from the vibrating body 21 to the first magnetic pole portion 31.

[0038] The curved diameter R1 of the first curved portion 23 is smaller than the curved diameter R2 of the second curved portion 24, and the first curved portion 23 has greater bending rigidity than the second curved portion 24. If the curved diameter R1 of the first curved portion 23 is relatively large, the first curved portion 23 may be easily bent (easily deformed) and may be more likely to interfere with the second magnetic pole portion 32. Furthermore, unnecessary resonance (including split resonance and anti-resonance) may occur. Furthermore, the occurrence of this unnecessary resonance may induce a rolling phenomenon. If the curved diameter R1 of the first curved portion 23 is made relatively small as described above, the occurrence of unnecessary resonance can be suppressed, and acoustic characteristics can be improved.

[0039] The second curved portion 24 of the edge 22 includes a reinforcing portion 24E that protrudes from the surface 24D of the second curved portion 24 along its radial direction. The reinforcing portion 24E of the second curved portion 24 is disposed between the outer circumferential portion 24B and the inner circumferential portion 24A of the second curved portion 24 and extends to the vicinity of the outer circumferential portion 23B of the first curved portion 23. In the illustrated example, the reinforcing portion 24E extends from the vicinity of the inner circumferential portion 24A of the second curved portion 24 to the vicinity of the outer circumferential portion 24B. This allows the reinforcing portion 24E to effectively ensure the amplitude of the vibrating body 21 by the second curved portion 24 having a large curvature diameter. Furthermore, the reinforcing portion 24E imparts appropriate rigidity to the second curved portion 24, allowing the edge 22 to support the vibrating body 21 in a predetermined position. Furthermore, the rolling phenomenon (sideways shaking) of the voice coil 25 can be suppressed. Furthermore, when the vibrating body 21 vibrates, the edge 22 may deform in the circumferential direction, which may cause wrinkles to form at the corners of the edge. Furthermore, the occurrence of these wrinkles may cause a rolling phenomenon in the voice coil 25. This reinforcing portion 24E has a shape that expands and contracts in the circumferential direction. Specifically, the reinforcing portion 24E has an apex, and the reinforcing portion 24E expands and contracts its shape by bending or refracting at this apex. The bending or refracting movement of this reinforcing portion 24E can prevent wrinkles from forming at the corners of the edge 22. Furthermore, the occurrence of the rolling phenomenon in the voice coil 25 can be prevented.

[0040] Generally, when making a speaker device thinner or more compact, it is possible to make it thinner by placing the diaphragm and magnetic circuit closer to each other, or to make it smaller by placing the frame closer to the magnetic circuit. In this case, since the concave edge is placed close to the yoke of the magnetic circuit, there is a possibility that the edge may come into contact with the yoke when the diaphragm vibrates. Furthermore, such contact may cause abnormal noise.

[0041] The speaker device 1 has the above-described structure, which makes it difficult for the edge 22 to come into contact with the second magnetic pole portion 32 (yoke 33), which is a component of the magnetic circuit 30, when the vibrating body 21 vibrates. Therefore, even if the speaker device 1 is made thinner by placing the vibrating body 21 close to the magnetic circuit 30, it is possible to prevent contact between the edge 22 and the yoke 33 and the generation of abnormal noise due to this contact.

[0042] That is, in order to prevent contact between the edge 22 and the yoke 33 and to reduce the thickness or size of the speaker device 1, the speaker device 1 includes a rigid vibrating body 21 and an outer peripheral portion 21A of the vibrating body 21 that protrudes outward from the connection position with the voice coil 25 and is disposed near the second magnetic pole portion 32. The speaker device 1 also includes an edge 22 that has a first curved portion 23 that is a convex curved portion and a second curved portion 24 that is a concave curved portion and is disposed outward from the first curved portion 23. By including such a vibrating portion 20 in the speaker device 1, it is possible to reduce the thickness and size of the speaker device 1 and to prevent the edge 22 from contacting the yoke 33 and generating abnormal noise due to such contact.

[0043] The illustrated edge 22 has an inner peripheral portion 22A, but is not limited to this and may have only an outer peripheral portion 22B. Specifically, the edge 22 and the vibrating body 21 may be integrally formed. Alternatively, the vibrating body 21 may have a two-layer structure of an elastic member and a rigid member that are integrally formed with the edge 22. In this case, the elastic member is disposed closer to the magnetic circuit 30 than the rigid member, thereby making it possible to make the speaker device 1 thinner than when the elastic member is disposed closer to the sound radiation side than the rigid member.

[0044] By providing the apex 23C of the first curved portion 23 near the outer circumferential portion 21A of the vibrating body 21, which has rigidity, a part of the first curved portion 23 can be maintained at approximately the same height as the vibrating body 21 even while the vibrating body 21 is vibrating, and contact with the second magnetic pole portion 32 can be prevented. In addition, since the distance between the first curved portion 23 and the second curved portion 24 can be made relatively large, the amplitude of the vibrating body 21 can be made relatively large.

[0045] As the speaker device is made smaller, there is a problem that the effective vibration area of ​​the vibrating body also becomes smaller. By locating the outer periphery 21A of the vibrating body 21 outside the voice coil 25 and further extending it to the vicinity of the apex 23C of the first curved portion 23, a relatively large effective area of ​​the vibrating body 21 can be obtained. Furthermore, by locating the apex 23C at a position away from the outer periphery 21A of the vibrating body 21 and at substantially the same height as the vibrating body 21 while keeping the curved diameter R1 of the first curved portion 23 relatively small (while maintaining rigidity), a part of the first curved portion 23 can be made part of the vibrating body 21. In this case, the effective vibration area of ​​the speaker device 1 can be made relatively large.

[0046] Not limited to the above description, the inner peripheral portion 22A of the edge 22 can also be made higher than the outer peripheral portion 22B of the edge 22. In this case, the distance between the edge 22 and the second magnetic pole portion 32 can be increased, which can prevent contact between them and also make the amplitude of the vibrating body 21 relatively large.

[0047] By positioning the apex 24C of the second curved portion 24 outward from the second magnetic pole portion 32, the distance between the first curved portion 23 and the second magnetic pole portion 32 can be made relatively large. This also makes it possible to prevent contact between the edge 22 and the second magnetic pole portion 32. Furthermore, since the distance between the first curved portion 23 and the second magnetic pole portion 32 can be made relatively large, contact between the first curved portion 23 and the second magnetic pole portion 32 can be prevented.

[0048] The vibrating body 21 includes a rigid vibration member 21B having rigidity, and the rigid vibration member 21B is made of carbon. As shown in Fig. 6, the rigid vibration member 21B includes a foam layer 21C having a foam structure and a covering layer 21D that covers the foam layer 21C.

[0049] The edge 22 is made of a resin material. In addition, the vibrating body 21 having the rigid vibrating member 21B has substantially the same shape as the rigid vibrating member 21B in the illustrated example, and is made of polyetherimide and has a density of approximately 1.27 g / cm 3 The vibration body 21 has a smaller density and a larger rigidity than the comparative vibration body having a Young's modulus of about 4 MPa.

[0050] The Young's modulus of the vibrating body 21 divided by the density is larger than the Young's modulus of the comparative vibrating body described above. The rigid vibrating member 21B, which is essentially made of carbon, has a density of about 0.5 g / cm. 3 , its Young's modulus is about 7 GPa, its bending strength is about 25 MPa, and its thickness is about 0.3 mm.

[0051] By constructing the vibrating body 21 from a material whose main component is carbon, it can be made lightweight and thin. Furthermore, it is lighter and more rigid than the comparative vibrating body described above, which is made of a resin material that forms the edge 22. In the illustrated example, the rigid vibrating member 21B has a foamed layer 21C with a foam structure and two coating layers 21D that cover the front and back surfaces of the foamed layer 21C. These coating layers 21D form a substantially continuous surface. Therefore, by providing the coating layer 21D on the surface of the foamed layer 21C, it is possible to prevent sound waves propagating from the back side (magnetic circuit 30 side) of the vibrating body 21 from passing through the vibrating body 21 and being emitted in the acoustic radiation direction, thereby improving acoustic characteristics.

[0052] [Magnetic circuit structure] 3, the magnetic circuit 30 includes a yoke 33, a magnet 35 supported by the yoke 33, and a plate 34. The yoke 33 includes a bottom surface 33A magnetically coupled to the magnet 35 and a wall portion 33B erected from the bottom surface 33A. A magnetic gap 30G is disposed between the plate 34 serving as the first magnetic pole portion 31 and the wall portion 33B of the yoke 33 serving as the second magnetic pole portion 32. In the illustrated example, the bottom surface 33A of the yoke 33 has a flat plate shape.

[0053] 6, which is a cross-sectional view taken along the line X1-X1 in FIG. 3, the magnetic circuit 30 includes a yoke 33, an inner magnet 35A supported by the yoke 33, an outer magnet 35B, and one or more plates 34. The yoke 33 includes a bottom surface 33A magnetically coupled to the magnet 35, the inner magnet 35A is disposed inside the voice coil 25, the outer magnet 35B is disposed outside the voice coil 25, the plate 34 is disposed on one of the inner magnet 35A or the outer magnet 35B, the first magnetic pole portion 31 is the plate 34 or the inner magnet 35A, and the second magnetic pole portion 32 is the plate on the outer magnet 35B or the outer magnet 35B. In the illustrated example, the plate 34 is the first magnetic pole portion 31, and the outer magnet 35B is the second magnetic pole portion 32.

[0054] FIG. 7 shows the overall configuration of the magnetic circuit (FIG. 7(a) is a plan view, and FIG. 7(b) is a perspective view). As shown in FIG. 7, a plurality (pair) of outer magnets (other magnets) 35B are arranged in opposing positions with an inner magnet (one magnet) 35A in between. The yoke 33 also has a plurality of opposing wall portions 33B. The outer magnets (other magnets) 35B are arranged between the wall portions 33B of the yoke 33 in the circumferential direction, and each outer magnet 35B is arranged so as to be magnetically coupled to the bottom surface portion 33A of the yoke 33.

[0055] The magnets 35 are oriented along the thickness direction of the magnets 35, but as an example, as shown in FIG. 8, they can also be oriented diagonally relative to the thickness direction. Here, the orientation of one of the magnets 35A (35B) out of the inner magnet 35A and the outer magnet 35B is along the thickness direction of the magnet 35A (35B), while the orientation of the other magnet 35B (35A) is diagonal relative to the thickness direction of the magnet 35B (35A). In the illustrated example, the outer magnet 35B is oriented diagonally relative to the thickness direction, but the orientation of the outer magnet 35B may be aligned along the thickness direction, and the orientation of the inner magnet 35A may be diagonal relative to the thickness direction. When the inner magnet 35A is oriented diagonally, for example, multiple rod-shaped inner magnets 35A are arranged in a ring shape on the yoke 33. The orientation of the inner magnet 35A and the outer magnet 35B may also be diagonal relative to the thickness direction. In this case, multiple rod-shaped inner magnets 35A and multiple rod-shaped outer magnets 35B are arranged in a ring shape on the yoke 33. The orientation of the inner magnet 35A and the outer magnet 35B may also be formed along the thickness direction. In this case, an inner plate is placed on the inner magnet 35A, and an outer plate is placed on the outer magnet 35B. In either case, the orientation of each of the inner magnet 35A and the outer magnet 35B is substantially constant along the thickness direction of the magnet. That is, the orientation does not substantially change significantly along the thickness direction of the magnet. In the illustrated example, the orientation of the outer magnet 35B is diagonally downward to the right, but this is not limited thereto. For example, if the orientation of the inner magnet 35A is downward along the thickness direction, the orientation of the outer magnet 35B is diagonally upward to the left. In this way, the orientation of the magnet 35 can be appropriately changed so that the magnetic flux emitted from the magnet 35 passes through the magnet 35 and the yoke 33 to form a magnetic loop (closed circuit).

[0056] At this time, the magnetic flux generated by outer magnet (other magnet) 35B passes through a position away from yoke 33, and magnetic gap 30G is formed near the position where the magnetic flux passes. That is, magnetic gap 30G is the position where the magnetic flux passes, and is formed between outer magnet (other magnet) 35B as a magnetic pole part and a magnetic pole part (plate 34) provided on a part of yoke 33 different from the position of outer magnet (other magnet) 35B.

[0057] In the illustrated example, the magnetic circuit 30 has the inner magnet 35A, the outer magnet 35B, the yoke 33, and the plate 34, but the wall portion 33B of the yoke 33 may be disposed instead of the outer magnet 35B.

[0058] When the speaker device 1 is driven, an audio signal is input to the voice coil 25. With the input of this audio signal, Joule heat is generated in the voice coil 25. This Joule heat may increase the temperature inside the magnetic circuit 30. Generally, when the temperature inside the magnetic circuit increases, the problem of high-temperature demagnetization may occur.

[0059] Furthermore, if Joule heat is not sufficiently dissipated as radiant heat from the voice coil 25, the temperatures of the voice coil 25 and the lead wire 26 may become relatively high. Generally, when the temperatures of the voice coil and the lead wire become relatively high, problems may arise in which they may break.

[0060] Furthermore, repeated driving of the speaker device 1 may cause the voice coil 25 and the lead wire 26 to reach a high temperature or a room temperature state. Also, in the environment in which the speaker device 1 is used, the voice coil 25 and the lead wire 26 may reach a low temperature state. Such repeated cycles of high temperature and room temperature or high temperature and low temperature generally apply a load to the voice coil or the lead wire, which may cause a break in the voice coil or the lead wire.

[0061] In an embodiment of the present invention, heat from the voice coil 25 or the lead wire 26 can be dissipated by propagating it to components of the magnetic circuit 30 or the frame 11 serving as the stationary part 10, which may contribute to solving the problems of high-temperature demagnetization and disconnection described above. An example of a heat propagation path is a propagation path that follows the voice coil 25 (including the lead wire 26), plate 34, magnets 35A and 35B, yoke 33, and frame 11 in that order. Another possible propagation path is from the wall of the yoke 33 to the frame 11. The heat propagation path is not limited to this, and other possible paths include heat propagation to components of the magnetic circuit 30 or components of the vibrating part 20 that are arranged near the voice coil 25 or the lead wire 26, other components, or the outside.

[0062] Furthermore, because magnets have a relatively large heat capacity, they can contribute to the efficient transfer of heat from the voice coil 25 and the lead wire 26. In particular, a magnetic circuit 30 that is a combined type that combines an internal magnet type and an external magnet type has an external magnet, as opposed to an internal magnet type magnetic circuit. Therefore, a combined type magnetic circuit has a greater number of magnets and a larger magnet surface area than an internal magnet type magnetic circuit. In this case, the heat capacity of the entire magnetic circuit 30 becomes relatively large, and it may be possible to dissipate more heat from the voice coil 25 or the lead wire 26.

[0063] Furthermore, when the magnetic circuit 30 is an external magnet type or a combined type, the outer diameter of the yoke 33 may be larger than that of an internal magnet type magnetic circuit. In this case, the heat capacity of the entire magnetic circuit 30 becomes relatively large, which may contribute more to the dissipation of heat from the voice coil 25 or the lead wire 26.

[0064] In the example shown in FIG. 7, the outer magnet (the other magnet) 35B has a shape (a rectangular shape elongated in one direction) defined by a major axis and a minor axis. The outer magnet (the other magnet) 35B also has an orientation determining section 36 formed by a notch 35B1. The orientation determining section 36 (notch 35B1) is provided to clearly indicate the orientation direction formed obliquely with respect to the thickness direction. Here, the surface without the notch 35B1 faces the magnetic gap 30G. By positioning the surface with the notch 35B1 on the wall 33B side of the yoke 33 and on the outside of the yoke 33, the magnet can be aligned in the appropriate direction.

[0065] When using outer magnets (other magnets) 35B, 35B that have substantially the same external shape, there is a problem in that it is not possible to identify the orientation of the magnets. Therefore, an orientation discrimination unit 36 ​​is provided to discriminate the orientation of the magnets and to place the other magnet in an appropriate position. This orientation discrimination unit 36 ​​can be formed by a notch 35B1 or the like provided in magnet 35 as described above, but it can also be formed by adding an indication such as an arrow to the surface of the magnet.

[0066] As described above, the magnets 35 in the magnetic circuit 30 of the speaker device 1 are arranged such that the orientation of the first magnet (either the inner magnet 35A or the outer magnet 35B) is in the thickness direction, and the orientation of the second magnet (either the outer magnet 35B or the inner magnet 35A) is oblique to the thickness direction. The magnetization direction may be aligned with the orientation of the magnets or may be in a different direction from the orientation of the magnets. Using magnets with an oblique orientation can prevent magnetic leakage (magnetic flux flowing toward the yoke 33 below and not passing through the magnetic gap 30G) and relatively increase the magnetic flux density in the magnetic gap 30G. Furthermore, the peak position of the magnetic flux density in the magnetic gap 30G can be set at a relatively high position, away from the yoke 33. Therefore, even if the magnetic circuit 30G is made thinner, a magnetic circuit 30 having a relatively high magnetic flux density can be used, and the electromagnetic force acting on the voice coil 25 can be relatively large.

[0067] Regarding the orientation determination unit 36, when a magnet with an oblique orientation is used, if a magnet with an orientation in the thickness direction is also used, it becomes difficult to distinguish between the two during production. Furthermore, it takes unnecessary time to determine which direction on the magnet is the oblique orientation. Therefore, for example, when a magnet with an oblique orientation is used as the second magnet (outer magnet 35B), a notch 35B1 is provided on the end face of the second magnet (outer magnet 35B) as a marker for determining the type of magnet.

[0068] [Magnetic circuit mounting structure] 9 to 11 show a mounting structure for mounting a magnetic circuit to a stationary part. Fig. 9 is a plan perspective view of the state in which the magnetic circuit is mounted in the stationary part, Fig. 10(a) is a cross-sectional view taken along X2-X2 in Fig. 9, Fig. 10(b) is a cross-sectional view taken along X3-X3 in Fig. 9, and Fig. 11 is a rear perspective view of the state in which the magnetic circuit is mounted in the stationary part. The speaker device 1 includes a frame 11 as the stationary part 10, and the frame 11 includes an outer circumferential cylindrical part 11A to which a yoke 33 of the magnetic circuit 30 is mounted, and a bottom part 11B having an opening 11B1.

[0069] The outer peripheral cylindrical portion 11A of the frame 11 has one or more recesses 11A2 at its lower end portion 11A1. The yoke 33 also has a protrusion 33C that protrudes from the bottom surface portion 33A toward the frame 11. The yoke 33 and the frame 11 are attached with a portion of the yoke 33 disposed in an opening 11B1 of the frame 11 and the protrusion 33C of the yoke 33 disposed in the recess 11A2 of the frame 11. The lower surface 33E of the yoke 33 is disposed on the vibrating body 21 side or at substantially the same position as the lower surface 11C of the frame 11. The frame 11 can be formed from a resin member or the like.

[0070] A joining member reservoir 51 is provided between the frame 11 and the outer magnet 35B to store joining members 50 that join the frame 11 and the outer magnet 35B. The joining member reservoir 51 has a predetermined gap 52. This gap 52 is composed of a first gap between the protruding portion 11E of the frame 11 and the outer magnet 35B, and a second gap between the inner side surface 11D of the frame 11 and the outer magnet 35B. The frame 11 has an inner side surface 11D that faces the outer magnet. The protruding portion 11E that constitutes the first gap protrudes inward from the inner side surface 11D of the frame 11 that faces the outer magnet 35B and is provided above the outer magnet 35B. The second gap is located closer to the yoke 33 than the first gap and has a width greater than the width of the first gap in the radial direction. The gap 52 is filled with joining members 50 that join the frame 11 and the outer magnet 35B.

[0071] A passage 37 is provided on the underside of the outer magnet 35B between the magnetic circuit 30 and the frame 11. This passage 37 connects a gap 52 provided between the frame 11 and the outer magnet 35B with the outside.

[0072] Electronic devices incorporating the speaker device 1 have limited internal space. The rear side of the speaker device 1 is provided with external terminals of the electronic device that electrically connect to the terminal portion 12 of the speaker device 1. Here, assume that a component of the magnetic circuit 30, such as a yoke 33, protrudes toward the electronic device from the frame 11. The yoke 33 is made of a conductive material, while the frame 11 is made of an insulating material such as resin. In this case, electrical contact between the conductive yoke 33 and the external terminals may occur, resulting in malfunction of the electronic device. In particular, since speaker devices for mobile phones are relatively small, if the shape tolerance of the yoke 33 is large, a portion of the yoke 33 may protrude from the frame 11. Therefore, by providing a recess 11A2 in the frame 11 and arranging the protruding portion 33C of the yoke 33 in this recess 11A2, the protruding portion of the yoke 33 can be prevented. This allows the speaker device 1 to be placed within a specified space, enabling the electronic device to be made thinner while avoiding contact between the yoke 33 and the external terminals.

[0073] More specifically, the recess 11A2 of the frame 11 serves as a positioning portion that determines the position of the yoke 33 relative to the frame 11 in the radial direction. The position of the yoke 33 can be substantially determined by the recess 11A2 of the frame 11. Furthermore, when making the speaker device 1 thinner, it is possible to prevent a portion of the yoke 33 from protruding due to tolerances in the shape of the yoke 33, etc. Furthermore, it is possible to prevent malfunctions of electronic devices that occur when a portion of the yoke 33 makes electrical contact with an external terminal. Furthermore, even if other components of the magnetic circuit 30 protrude relative to the frame 11, it is possible to prevent electrical contact with the external terminal.

[0074] In the radial direction of the magnetic circuit 30 (the direction intersecting the vibration direction of the voice coil 25), for example, the position of the outer magnet 35B may be adjusted radially to set the magnetic gap 30G to a specified width. Furthermore, if the outer magnet 35B has a width greater than the desired width (has a tolerance), prioritizing the width of the magnetic gap 30G may result in the outer magnet 35B being unable to be installed within the frame 11. To resolve this, a predetermined gap 52 is provided between the frame 11 and the outer magnet 35B. A portion of the outer magnet 35B, whose width is substantially the same as the tolerance, is placed within this gap 52. This allows the magnetic gap 30G to have the specified width. Furthermore, the outer magnet 35B can be placed within the frame 11.

[0075] To join the frame 11 and the outer magnet 35B, a joining material 50 is filled into this gap 52. A protrusion 11E is provided on the inner side surface 11D of the frame 11. When this joining material 50 is filled, the protrusion 11E prevents the joining material 50 from leaking out above the outer magnet 35B. In addition, a predetermined gap is provided between the frame 11 and the yoke 33 to serve as a passage 37 that communicates with the outside. The injection port (dispenser) of a syringe that injects this joining material 50 can be inserted into the passage 37. In addition, the joining material 50 can be filled between the frame 11 and the outer magnet 35B.

[0076] The frame 11 has a bottom surface 11B that abuts against the bottom surface 33A of the yoke 33, and an outer peripheral cylindrical portion 11A that surrounds the magnetic circuit 30 and supports the edge 22. A gap 52 is provided between the outer peripheral cylindrical portion 11A of the frame 11 and the second magnet (outer magnet 35B). A joining member 50 is filled into this gap 52 to join the frame 11 and the second magnet (outer magnet 35B). Note that the gap 52 is a predetermined gap on the frame 11 side from the outer peripheral side surface of the second magnet (outer magnet 35B), making it possible to attach the magnetic circuit 30 including the second magnet (outer magnet 35B) to the frame 11 in accordance with the size (tolerance) of the magnet.

[0077] For example, the dimensions of a speaker device 1 installed in a mobile phone are predetermined. Furthermore, in order to fit within the specified dimensions and satisfy requirements such as a relatively large electromagnetic force of the voice coil 25, the speaker device 1 must effectively utilize the specified dimensions. Furthermore, the positions of each component within the speaker device 1 are specified with relatively high precision to ensure the specified dimensions. Therefore, if there are multiple components and the components have tolerances, misalignment of the components may result in components being unable to be positioned in the specified positions, or the speaker device may exceed the specified dimensions. To address this, in order to reduce misalignment due to the tolerances of the components, a recess 11A2 is provided in the outer cylindrical portion 11A of the frame 11 facing the yoke 33, and the protrusion 33C of the bottom surface 33A of the yoke 33 is positioned in this recess 11A2. At this time, a portion of the yoke 33 corresponding to the tolerance is positioned within the recess 11A2 of the frame 11. Such an arrangement can reduce deviations due to tolerances of the components and reduce the thickness of the speaker device 1. Therefore, it becomes possible to arrange other components in specified positions and to make the speaker device 1 have specified dimensions.

[0078] 12(a) and 12(b) are explanatory diagrams showing other examples of the magnetic circuit mounting structure. In the example of FIG. 12(a), the first magnetic pole portion 31 is formed by the inner plate 34A, and the second magnetic pole portion 32 is formed by the outer plate 34B, forming a magnetic gap 30G therebetween. When mounting the magnetic circuit 30 to the stationary part 10, the upper surface of the outer plate 34B is abutted against the fixing surface 11E1 formed on the lower surface of the protruding part 11E of the frame 11. In the example of FIG. 12(b), the upper surface of the yoke 33 is abutted against the fixing surface formed on the bottom part 11B of the frame 11, thereby mounting the magnetic circuit 30 to the stationary part 10. In the example of FIG. 12(a), the inner magnet 35A and the outer magnet 35B have substantially the same thickness. The thickness of the outer plate 34B is greater than the thickness of the inner plate 34A. This allows a relatively large gap to be formed between the outer plate 34B and the edge 22 located above it. 12(a), the inner magnet 35A and the outer magnet 35B may be oriented in the thickness direction. In this case, the magnetic gap 30G is substantially formed between the inner plate 34A and the outer plate 34B. In FIG. 12(b), the outer magnet 35B may be oriented diagonally relative to the thickness direction, and the inner magnet 35A may be oriented in the thickness direction. In this case, the magnetic gap 30G is substantially formed between the inner plate 34A and the outer magnet 35B.

[0079] Leader placement and break prevention 4 shows a cross-sectional view of the voice coil 25 and the lead wire 26. The voice coil 25 includes a lead wire 26 drawn from a lower end 25A thereof and a plurality of terminals 12 that electrically connect the voice coil 25 to the outside via the lead wire 26. The terminals 12 are provided on the frame 11. The yoke 33 includes a plurality of walls 33B extending from the bottom surface 33A thereof and notches 33F provided between adjacent walls 33B. The lead wire 26 of the voice coil 25 passes through the notches 33F and a lead passage 38 provided between the wall 33B of the yoke 33 and an inner side surface 11D of the frame 11 facing the wall 33B, and is connected to the terminals 12.

[0080] 9, the plurality of terminal portions 12 provided on the frame 11 are arranged on the side of one region 25N1 of two regions 25N1 and 25N2 defined by the long axis 25L of the voice coil 25. In the illustrated example, a plurality of lead wires 26 are provided. The lead wires 26 are led out from the voice coil 25 at positions located on the side of the other region 25N2.

[0081] That is, a second magnet (outer magnet 35B) is disposed on the yoke 33 outside the voice coil 25. A lead wire 26 extends from the lower end 25A of the voice coil 25. The lead wire 26 is routed toward a plurality of terminals 12 disposed on one side of two regions separated by a major axis 25L passing through the center of the voice coil 25. The lead wire 26 extends near a corner of the voice coil 25, specifically, from a substantially straight portion of the multiple curved and straight portions of the voice coil 25. A retraction portion 40 into which the lead wire 26 retracts is provided on the bottom surface 33B of the yoke 33 corresponding to the lead position of the lead wire 26. The retraction portion 40 has a concave cross section. The yoke 33 includes a plurality of wall portions 33B, and a notch 33F is provided in the yoke 33 between adjacent wall portions 33B. A lead-out passage 38 for routing the lead-out wire 26 is formed between the cutout portion 33F, the wall portion 33B of the yoke 33, and the inner side surface 11D of the frame 11. A portion of the end side of the lead-out wire 26 is electrically connected to the terminal portion 12, and an audio signal is input from the outside to the voice coil.

[0082] The lead wire 26 of the voice coil 25 has a lead portion 26A that crosses the end face of the voice coil 25 on the side opposite to the vibrating body 21 (see FIG. 4). The magnetic circuit 30 has a bottom surface 33A that faces the end face of the voice coil 25 that is disposed in the magnetic gap 30G. The bottom surface 33A has a retraction portion 40 into which the lead portion 26A retracts when the lower end surface 25A of the voice coil 25 abuts or approaches the bottom surface 33A. That is, the yoke 33 (stationary portion 10) that faces the lower end 25A of the voice coil 25 has a retraction portion 40 into which the lead portion 26A of the lead wire 26 that is drawn from the voice coil 25 retracts (see FIGS. 4 and 9). The retraction portion 40 into which the lead portion 26A retracts is provided to prevent the voice coil 25 and the yoke 33 from coming into contact with each other due to an external impact, which could result in the lead wire 26 being broken. The retracted portion 40 has a concave cross section.

[0083] [Terminal structure] 13 to 15 are explanatory diagrams showing the structure of the terminal portion. Fig. 15 is a perspective view of a part of the outer peripheral cylindrical portion 11A of the frame 11, seen from the magnetic circuit 30 side. The terminal portion 12 includes a first contact portion 12A that contacts an external terminal portion, an elastic support portion 13 that elastically supports the first contact portion 12A with respect to the frame 11, and a second contact portion 12B that is electrically connected to the lead wire 26 of the voice coil 25. The frame 11 includes a fixing portion 14 that fixes the terminal portion 12.

[0084] The outer peripheral tube portion 11A of the frame 11 has a latched portion 11A3 to which an end portion 12C of the first contact portion 12A is latched, and the latched portion 11A3 prevents the first contact portion 12A from moving downwardly of the frame 11. The end portion 12C of the first contact portion 12A is latched to the latched portion 11A3. The end portion 12C of the first contact portion has a latching portion 12D that latches to the latched portion 11A3. The latching portion 12D has a shape that protrudes from the end portion 12C of the first contact portion 12A toward the latched portion 11A3. The latching portion 12D of the first contact portion 12A extends in a direction that intersects with the extension direction of the first contact portion 12A.

[0085] The outer cylindrical portion 11A of the frame 11 has a storage portion 11A4 that stores the terminal portion 12, and the storage portion 11A4 is a recess formed in an outer side surface 11A5 of the outer cylindrical portion 11A of the frame 11. The outer cylindrical portion 11A of the frame 11 has a movement space 11A6 in which the first contact portion 12A moves along the vibration direction of the voice coil 25.

[0086] The locked portion 11A3 provided on the outer cylindrical portion 11A of the frame 11 can restrict the movement of the first contact portion 12A downward from the frame 11 (toward the housing of the mobile phone). However, as the first contact portion 12A moves, the elastic support portion 13 repeatedly bends, which can cause a problem of a decrease in its elastic force. In particular, if the movement range of the first contact portion 12A is large, the decrease in elastic force can be even greater. Therefore, by providing the locked portion 11A3 and limiting the movement range of the first contact portion 12A, the elastic force of the elastic support portion 13 can be maintained for a long period of time.

[0087] By arranging the terminal portion 12 inside the outer cylindrical portion 11A of the frame 11, the speaker device 1 can be made to have a specified dimension and can be made compact. The outer cylindrical portion 11A of the frame 11 has a movement space (opening) through which the first contact portion 12A moves along the vibration direction of the voice coil 25. Therefore, even when the external terminal portion approaches the first contact portion 12A, the first contact portion 12A can maintain a good contact state with the external terminal portion while moving. Furthermore, when the external terminal portion moves away from the first contact portion 12A, the contact state is released, and the locked portion 11A3 can maintain a predetermined distance between the external terminal portion and the first contact portion 12A.

[0088] For example, the terminal portion 12 of the speaker device 1 may be electrically connected to a terminal portion (external terminal portion) of a mobile phone. In this case, the terminal portion 12 also includes the first contact portion 12A, the elastic support portion 13, the second contact portion 12B, and the fixing portion 14, as described above. The first contact portion 12A contacts the external terminal portion. The elastic support portion 13 elastically supports the first contact portion 12A with respect to the frame 11. The second contact portion 12B is electrically connected to the lead wire 26 of the voice coil 25. The fixing portion 14 fixes the terminal portion 12 to the frame 11. An end of the first contact portion 12A includes a locking portion 12D that is locked to the frame 11. The locking portion 12D prevents the first contact portion 12A from moving downward from the frame 11 (toward the housing of the mobile phone). Furthermore, the locking portion 12D maintains the elasticity of the curved elastic support portion 13 for a long period of time. The frame 11 has a storage portion for storing the terminal portion 12 on an outer side surface 11A5 of the outer cylindrical portion 11A so that the speaker device 1 fits within specified dimensions. The frame 11 has a movement space 11A6 (opening) for the first contact portion 12A to move along the thickness direction of the speaker device 1. The movement space 11A6 has an opening 11A7 on the inside of the outer cylindrical portion 11A of the frame 11. This opening 11A7 is provided at a position adjacent to the locked portion 113, and the locking portion 11D and a part of the first contact portion 12A move within this opening 11A7. The terminal portion 12 is attached to the frame 11 by a fixing portion 14.

[0089] [Example of speaker device] 16 and 17 are external perspective views showing the overall configuration of the speaker device 1. As shown in FIG. 16, the edge 22 has a shape defined by a major axis 22L1 and a minor axis 22L2, i.e., a rectangular outer shape that is long in one direction. As described above, the edge 22 has the first curved portion 23 and the second curved portion 24, and thus has a cross-sectional shape that is convex on the side opposite to the sound radiation direction. The edge 22 has one or more protrusions 24E at its corners. The protrusions 24E have a cross-sectional shape that is convex on the sound radiation side or on the side opposite to the sound radiation side. The protrusions 24E extend along the radial direction of the edge 22. The outer periphery of the protrusion 24E is located inside the outer periphery 22B of the edge 22 (see FIG. 5), and the inner periphery of the protrusion 24E is located inside the inner periphery 22A of the edge 22 (see FIG. 5). The inner periphery 22A of the edge 22 supports the vibrating body 21.

[0090] The speaker device 1 includes a frame 11 as a stationary part 10, a vibrating part 20, a magnetic circuit 30, and a protective part 60 that protects a vibrating body 21. The vibrating part 20 has a vibrating body 21 and an edge 22 that supports the vibrating body 21 on the frame. The outer shape of the speaker device 1 does not have to be rectangular, and may be circular, elliptical, truck-shaped, or the like.

[0091] The protective portion 60 covers a portion of the edge 22, and an opening 61 exposes the vibrating body 21. The edge 22 supports the vibrating body 21 on the frame 11 at its inner circumferential portion 22A. A magnetic circuit 30 supported by the frame 11 is disposed on the rear side of the vibrating body 21. The voice coil 25 is supported by the vibrating body 21 via the inner circumferential portion 22A of the edge 22. The vibrating body 21 is formed of a material whose main component is carbon and is electrically conductive. The voice coil 25 needs to be attached to the vibrating body 21 via the edge 22, which is made of an insulating material (such as resin). The magnetic circuit 30 includes a plate 34, a yoke 33, and a magnet 35. The yoke 33 includes a bottom portion 33A and a wall portion 33B erected from the bottom portion 33A.

[0092] As an example, the magnetic circuit 30 employs an internal / external magnetic type magnetic circuit in which magnets 35A, 35B are arranged on the inside and outside of the voice coil 25. A first space is provided on the front side (sound radiation side) of the vibrating body 21, and a second space is provided on the back side of the vibrating body 21.

[0093] In a direction intersecting the vibration direction of the voice coil 25, the outer circumferential portion 21A of the vibrating body 21 is located near the position of the wall portion 33B of the yoke 33. In addition, the inner circumferential portion 22A of the edge 22 is also located near the position of the wall portion 33B of the yoke 33. In this case, because the vibrating body 21 has bending rigidity, when the vibrating body 21 vibrates, it is possible to prevent the edge 22 from coming into contact with the wall portion 33B of the yoke 33, and it is possible to locate the position of the inner circumferential portion 23A of the first curved portion 23 or the inner circumferential portion 24A of the second curved portion 24 of the edge 22 near the position of the wall portion 33B of the yoke 33.

[0094] Such a speaker device 1 can be used for electronic devices and in-vehicle devices. Fig. 18 is an explanatory diagram showing an application example of the speaker device 1 according to the embodiment of the present invention. For example, the speaker device 1 can be housed in a housing as a mounting member provided in an electronic device 100 such as a mobile phone or a personal digital assistant as shown in Fig. 18(a), or an electronic device such as a flat panel display. In this case, the thickness of the electronic device can be made relatively small.

[0095] The speaker device 1 can also be used in an automobile 200 as shown in Fig. 1(b). In particular, the speaker device according to the embodiment of the present invention can be attached to a door panel, ceiling, rear tray, or dashboard as an attachment member. In this case, the thickness of the attachment member such as the door panel can be made relatively small, and the passenger space can be made relatively large.

[0096] 19A and 19B are explanatory diagrams showing another example of an electronic device to which the speaker device 1 according to the embodiment of the present invention is applied. An electronic device 101 shown in Fig. 19A is a personal computer (portable, notebook, laptop, etc.), and an electronic device 102 shown in Fig. 19B is a headphone.

[0097] The electronic device 101 includes a display unit 101A and an input operation unit 101B, and the input operation unit 101B serves as a housing for accommodating the speaker device 1. Both ends of the display unit 101A and the input operation unit 101B are rotatably connected. In the illustrated example, a plurality of speaker devices 1 are provided so that vibrators are arranged on the operation surface of the input operation unit 101B. Furthermore, without being limited to the illustrated example, the display unit 101A may serve as a housing, and one or more speaker devices 1 may be arranged on the side thereof, for example.

[0098] The electronic device 102 has a pair (multiple) of housings 102A, 102A that house the speaker devices 1, and an arch-shaped connecting portion 102B that connects the housings 102A, 102A serves as a wiring housing portion that houses wiring that electrically connects the multiple speaker devices 1.

[0099] 20 to 22 are explanatory diagrams showing an example of mounting a speaker device according to an embodiment of the present invention in an electronic device. Fig. 20 is an overall configuration diagram showing an example of mounting the speaker device in the above-mentioned electronic device 101. In the example shown, there are provided a plurality of housings 110 that house the speaker devices 1 with the vibrating body 21 exposed. Between the housings 110, 110, there is provided a wire housing 120 that houses wires that electrically connect the plurality of speaker devices 1. The wire housing 120 is provided with a terminal portion 121 for electrically connecting to the electronic device.

[0100] 21(a) is an enlarged perspective view of a portion A1 in FIG. 20, and FIG. 21(b) is an enlarged cross-sectional view of a portion A2 in FIG. 20. In FIG. 21(a), a speaker device 1 including a vibrating body 21 is housed in a housing 110, and the housing 110 includes a frame (first stationary portion) 111 that supports a vibration portion (vibrating body 21, edge 22) and a cabinet 112 (second stationary portion) that forms an air chamber between the housing 110 and the vibrating body 21. The frame 111 includes an outer circumferential cylindrical portion that surrounds the vibrating body 21. An attachment portion 111A that attaches the frame 111 to the housing 110 of an electronic device is provided on the outer circumferential side of the outer circumferential cylindrical portion of the frame 111. The cabinet 112 is disposed on the rear side of the frame 111 (below the magnetic circuit 30).

[0101] 21(b), the speaker device 1 including the vibrating body 21 is housed in a housing 110, and the housing 110 includes a frame (first stationary part) 111 that supports a vibrating part (vibrating body 21, edge 22). In this example, the housing 110 includes a cabinet 112 arranged on the rear side of the frame 111. An air passage 111S is provided between the frame 111 and the yoke 33. In the illustrated example, a gap is provided between the inner side surface of the outer circumferential cylindrical part 113 of the frame 111 and the outer circumferential side part of the yoke 33. This gap serves as the air passage 111S that communicates the space between the vibrating body 21 and the magnetic circuit 30 with the space between the magnetic circuit 30 and the cabinet 112. In addition, the inside of the frame 111 communicates with an air chamber 112S in the cabinet 112 via this air passage 111S. The air chamber 112S is provided near the outside of the edge 22 and on the rear side of the yoke 33 of the magnetic circuit 30.

[0102] FIG. 22 is an explanatory diagram showing the housing of part A1 in FIG. 20, with (a) being an exploded perspective view and (b) being a rear view of the frame. The yoke 33 of the magnetic circuit 30 is disposed on the frame 111 that supports the vibrating body 21 and the edge 22. The aforementioned cutout portions 33F are formed in the four corners of this yoke. The cutout portions 33F correspond to the air passages 111S. An air chamber 112S is provided on the side of the cabinet 112 attached to the rear side of the frame 111. The space within the frame 111 communicates with the air chamber 112S via the air passages 111S of the frame 111.

[0103] Moreover, the housing 110 has an inclined surface portion 114 on the outside of the outer cylindrical portion 113. By providing this inclined surface portion 114, the space between the housing 110 and the speaker device 1 can be made relatively large, thereby improving acoustic characteristics. The electronic device 101 shown in FIG. 19 has a sound emitting portion (near the position of the speaker device 1 in FIG. 19) that emits sound waves emitted from the speaker device 1 to the outside. This sound emitting portion is formed by providing a plurality of holes in a part of the housing 110. The sound emitting portion also communicates the space between the housing 110 and the speaker device 1 with the outside. Therefore, the electronic device 101 can be provided with an acoustic speaker device that has an air chamber (first air chamber) on the back side of the vibrating body and an air chamber (second air chamber) on the front side (sound emitting side) of the vibrating body.

[0104] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention also includes design changes within the scope of the present invention. The embodiments shown in the above figures can be combined with each other as long as there are no particular contradictions or problems in their purpose, configuration, etc. Furthermore, the contents of each figure can be independent embodiments, and the embodiment of the present invention is not limited to a single embodiment obtained by combining the figures.

[0105] The entire contents of PCT / JP2009 / 051646, filed internationally on January 30, 2009, PCT / JP2007 / 065007, filed internationally on July 31, 2007, PCT / JP2007 / 067752, filed internationally on September 12, 2007, U.S. patent application US12 / 670819, which entered the U.S. national phase on January 26, 2010, U.S. patent application US12 / 675079, which entered the U.S. national phase on February 24, 2010, and European patent application EP07807159.4, which entered the European national phase on February 23, 2010, are incorporated herein by reference. [Explanation of symbols]

[0106] 1: Speaker device, 10: Stationary part, 11: Frame, 12: Terminal part, 20: Vibration part, 21: Vibration body, 22: Edge, 22a, 22b, 22c: resin layer, 25: voice coil, 26: Lead wire, 30: Magnetic circuit, 31: First magnetic pole part, 32: Second magnetic pole part, 33: Yoke, 34: Plate, 30G: Magnetic gap, 35: Magnet, 37: Passageway, 38: Drawer passageway, 39: Bottom surface, 40: Evacuation section, 50: Joint member, 51: Joint material reservoir, 52: Gap, 100, 101, 102: Electronic device, 110: Housing, 111: Frame (first stationary part), 112: Cabinet (second stationary part), 111S: ventilation path, 112S: air chamber, 120: wiring storage section, 200: Automobiles

Claims

[Claim 1] a frame having an outer circumferential cylindrical portion; a magnetic circuit having a yoke and at least a portion of which is located inside the frame; Equipped with the outer cylindrical portion has one or more recesses, A speaker device, wherein a part of the yoke is located in the recess.

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