JP2021061622A - Speaker device - Google Patents

Abstract

To thin or miniaturize a speaker device.SOLUTION: A speaker device includes: a frame 11 having an outer peripheral cylinder part 11A; and a magnetic circuit 30 having a york 33 and at least a part thereof positioned at an inner side of the frame 11. The outer peripheral cylinder part 11A has one or multiple recesses 11A2 and a part of the york 33 is positioned at the recesses.SELECTED DRAWING: Figure 11

Description

The present invention relates to a speaker device.

The speaker device includes a diaphragm, a voice coil, and a magnetic circuit as a basic configuration. The conventional speaker device described in Patent Document 1 below includes a relatively flat diaphragm body in which the diaphragm is made of foamed mica or the like, and the outer peripheral portion of the diaphragm is supported by a frame via an edge. .. A voice coil is provided on the lower surface of the diaphragm body, and the voice coil is arranged in the magnetic gap of the magnetic circuit.

Jitsukaisho 62-147991

Speaker devices are installed in various electronic devices that generate sound. At this time, for example, when it is installed in a portable electronic device, it is required to reduce the thickness and size of the speaker device in order to improve the portable holding property.

It is an object of the present invention to reduce the thickness or size of the speaker device.

In order to achieve such an object, the speaker device according to the present invention has at least the following configurations.
A frame having an outer peripheral cylinder portion and a magnetic circuit having a yoke and at least a part of which is located inside the frame are provided, and the outer peripheral cylinder portion has one or a plurality of recesses of the yoke. A part of the speaker device is located in the recess.

It is explanatory drawing explaining the speaker apparatus which concerns on embodiment of this invention (the figure (a) is a vertical sectional view, and the figure (b) is an enlarged view of part A). It is explanatory drawing which showed the other form of the vibrating part of the speaker apparatus which concerns on embodiment of this invention. The cross-sectional view which showed the whole structure of the speaker apparatus which concerns on embodiment of this invention. FIG. 1 is a partially enlarged sectional view of FIG. Explanatory drawing which shows the detail of the edge of the speaker apparatus which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line X1-X1 of FIG. Explanatory drawing which showed the whole structure of the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention (the figure (a) is a plan view, and the figure (b) is a perspective view). Explanatory drawing which shows the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention. The explanatory view which showed the mounting structure which attaches the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention to a stationary part. The explanatory view which showed the mounting structure which attaches the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention to a stationary part. The explanatory view which showed the mounting structure which attaches the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention to a stationary part. The explanatory view which showed the mounting structure which attaches the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention to a stationary part. The explanatory view which showed the structure of the terminal part in the speaker apparatus which concerns on embodiment of this invention. The explanatory view which showed the structure of the terminal part in the speaker apparatus which concerns on embodiment of this invention. The explanatory view which showed the structure of the terminal part in the speaker apparatus which concerns on embodiment of this invention. The external perspective view which showed the whole structure of the speaker apparatus which concerns on embodiment of this invention. The external perspective view which showed the whole structure of the speaker apparatus which concerns on embodiment of this invention. The explanatory view which showed the application example of the speaker apparatus which concerns on embodiment of this invention. The explanatory view which showed the application example of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of mounting the speaker apparatus which concerns on embodiment of this invention into an electronic device. It is explanatory drawing which showed the example of mounting the speaker apparatus which concerns on embodiment of this invention into an electronic device. It is explanatory drawing which showed the example of mounting the speaker apparatus which concerns on embodiment of this invention into an electronic device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following figures are explanatory views for explaining the speaker apparatus according to the embodiment of the present invention. As for the reference numerals of the respective figures, the same reference numerals are given to common parts, and some duplicate explanations are 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.

1A and 1B are explanatory views showing a basic configuration of a speaker device according to an embodiment of the present invention, in which FIG. 1A is a vertical sectional view and FIG. 1B is an enlarged view of a portion A in FIG. Is.

The speaker device 1 includes a stationary unit 10, a vibrating unit 20, and a magnetic circuit 30. The vibrating portion 20 includes a vibrating body 21 having an outer peripheral portion 21A, an edge 22 that supports the vibrating body 21 on the stationary portion 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 members. The edge 22 has a laminated structure in which a plurality of resin layers 22a1, 22a2 made of a resin film are laminated. The rigidity of the vibrating body 21 is larger than the rigidity of the edge 22.

The resin layers 22a1, 22a2 of the edge 22 are two layers in the illustrated example, but are not limited thereto. For example, the edge 22 may include a plurality of layers. The edge 22 can also be formed only by a plurality of resin layers 22a1,22a2. Further, as will be described later, the edge 22 can be configured in combination with another layer. The magnetic circuit 30 is composed of a plate, a yoke, a magnet, and the like, which will be described later, forms a magnetic gap 30G, and a voice coil 25 is arranged in the magnetic gap 30G.

The speaker device 1 includes a vibrating body 21 having a rigidity higher than that of the edge 22 and a vibrating body 21 and an edge 22 having a predetermined internal loss by using the vibrating body (diaphragm) 21 and the edge 22 as separate members. be able to. In such a speaker device 1, the vibrating portion 20 (vibrating body 21, edge 22) can be made relatively thin without providing a reinforcing portion such as a rib on the vibrating body 21. If necessary, the vibrating body 21 may be provided with a reinforcing portion such as a rib as shown in FIG. 3 described later. Further, since the edge 22 is provided with a multi-layer structure, it can be provided with a relatively large internal loss while having rigidity capable of oscillatingly supporting the vibrating body 21.

In a speaker device that has been made thinner and smaller, the diaphragm and the edge may be integrally formed. When the diaphragm and the edge are integrally formed, the acoustic characteristics on the high frequency side may deteriorate when the common member of the diaphragm and the edge is made of a relatively soft material. On the other hand, if the common member of the diaphragm and the edge is hardened, the acoustic characteristics on the low frequency side may deteriorate. It is also conceivable that the common member of the diaphragm and the edge is made of a relatively soft material, and the vibrating body is provided with a reinforcing portion such as a rib to increase the rigidity. However, if such a reinforcing portion is provided on the vibrating body, the thickness of the vibrating body becomes relatively large, and it is difficult to achieve thinning and miniaturization of the speaker device. On the other hand, the speaker device 1 described in the present embodiment can improve the acoustic characteristics in the low frequency range and the high frequency range.

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 to the outside of the audible range. Further, since the edge 22 has a relatively large internal loss, the peak at the low frequency reproduction frequency can be made relatively small. Further, since the vibrating body 21 is provided with a relatively large internal loss, the peak value in the vicinity of the high frequency limit frequency can be made relatively small, and the acoustic characteristics can be flattened from the low frequency to the high frequency.

In the example shown in FIG. 1B, the edge 22 includes a plurality of resin layers 22a1,22a2 and a soft layer 22b that is soft with respect to the resin layers 22a1,22a2. In this example, the thickness (b) of the soft layer 22b is larger than the thickness (a1 + a2) of the plurality of resin layers 22a1,22a2. The Young's modulus of the edge 22 is smaller than the Young's modulus of the comparative edge (having the same thickness as the thickness of the edge 22 to be compared) composed of a single layer made of the same material as the resin layers 22a1, 22a2. The internal loss of the edge 22 is larger than the internal loss of the comparative edge described above.

In the edge 22 composed of the plurality of resin layers 22a1,22a2 and the soft layer 22b, the soft layer 22b is thicker than the resin layers 22a1,22a2, so that the physical properties of the soft layer are more affected by the physical properties of the edge 22 than the resin layers 22a1,22a2. Is large. That is, the physical characteristics of the soft layer 22b become a dominant factor in the physical characteristics of the edge 22, and the internal loss of the edge 22 can be made relatively large. As a result, the peak value in the vicinity of the low-frequency resonance frequency appearing in the acoustic characteristics can be reduced, and the acoustic characteristics can be flattened.

The plurality of resin layers 22a1, 22a2 included in the edge 22 may be made of a resin member common to each other or a resin material in which the resin members are common to each other. As a common resin material, at least one of a plurality of different resin materials constituting the resin members constituting the plurality of resin layers 22a1, 22a2 may be common. Here, the common resin member means a resin member having substantially the same density as each other, and a resin member having substantially the same Young's modulus and internal loss. Further, the common resin material means a resin material having substantially the same density as each other and a resin material having substantially the same Young's modulus and internal loss, similarly to the resin member. According to this, for example, when the plurality of resin layers 22a1, 22a2 of the edge 22 are composed of a common resin member (resin members having substantially the same Young's modulus, internal loss, and density with each other), the resin material Peeling between the resin layers can be suppressed due to deformation due to shrinkage or the like.

Further, if necessary, the plurality of resin layers 22a1, 22a2 of the edge 22 can be made of different resin members from each other. For the resin layers 22a1,22a2, for example, the resin member may be selected so that the glass transition temperature of the resin member of the resin layer 22a1 is higher than the glass transition temperature of the resin layer 22a2. Specifically, the resin layer 22a1 may be composed of a resin member using PEEK as a resin material, and the resin layer 22a2 may be composed of a resin member using PET as a resin material. Further, using an edge 22 in which a resin layer having a resin material having a relatively high glass transition temperature is arranged on the voice coil 25 side and a resin layer having a resin material having a relatively low glass transition temperature is arranged on the vibrating body 21 side. It doesn't matter.

In the illustrated example, the inner peripheral 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 peripheral portion 22A of the edge 22. The upper end of the voice coil 25 is connected to the inner peripheral portion 22A of the edge 22.

In this example, the resin film constituting the resin layer 22a2 arranged on the voice coil side of the edge 22 has a glass transition temperature of 100 ° C. or higher. Further, the resin film is mainly composed of a resin material having a glass transition temperature of 100 ° C. or higher. Specifically, the resin film is PEN (polyethernaphthalate, glass transition temperature = 155 ° C), PEEK (polyetheretherketone, glass transition temperature = 143 ° C), PET (polyester, glass transition temperature = 115 ° C). ) Etc. can be used.

In the illustrated example, the vibrating body 21 has a flat plate shape, and the vibrating body 21 is composed of a ceramic-based rigid vibrating member. Since a ceramic-based rigid vibrating member is used for the vibrating body 21, Joule heat of the voice coil 25 propagates to the edge 22 and the vibrating body 21, and Joule heat is stored in the vibrating body 21. Since Joule heat is stored in the vibrating body 21, the temperature of the inner peripheral portion 22A of the edge 22 rises, and the edge 22 cannot follow the vibrating body 21 unless the material of the edge 22 is properly selected. On the other hand, since the speaker device 1 uses a resin film having a relatively high glass transition temperature as the resin layer 22a2 of the edge 22, the edge 22 is a vibrating body even if Joule heat is stored in the vibrating body 21. Can follow 21. Further, by using a resin film having a relatively high glass transition temperature for the edge 22, the temperature of the edge 22 becomes relatively high, and even if the physical properties of the edge 22 change in temperature, the vibrating body 21 can vibrate freely in the stationary portion 10. Can be supported by. Further, by using a resin film having a relatively high glass transition temperature for the edge 22, the voice coil 25 can be arranged at a predetermined position with respect to the magnetic circuit 30 while driving the speaker device. Further, by using a resin film having a relatively high glass transition temperature for the edge 22, the vibration of the vibrating body 21 can be regulated while driving the speaker device.
Further, if the vibrating body 21 is made of a ceramic-based rigid vibrating member, the weight is reduced, so that the sound pressure can be relatively increased.

In the speaker device 1, a ceramic-based rigid vibrating member having a relatively low strength against an external impact is provided by interposing an edge 22 that is relatively more flexible than the vibrating body 21 between the vibrating body 21 and the voice coil 25. Can be used for the vibrating body 21. According to this, for example, an electronic device (such as a portable electronic device) equipped with the speaker device 1 may fall and an impact may be applied. At this time, the voice coil 25 may come into contact with the yoke 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 the vibrating body 21 from having a problem such as cracking. Further, the edge 22 serves as a cushioning member that relaxes the external force generated by the voice coil 25.

The rigid vibrating member can be substantially made of carbon (for example, carbon ceramics). Further, the rigid vibration member can be composed of a constituent member having a foamed layer having a foamed structure and a coating layer covering the foamed layer. The coating layer included in this rigid vibrating member is a layer that is continuously formed. The density of the coating layer is greater than the density of the foam layer. Further, the porosity of the coating layer is smaller than the density of the foamed layer. The porosity (%) referred to here is (1- [weight of foamed layer or coating layer (g)] / [density of constituent material (g / m3)] / [volume of foamed layer or coating layer (m3)]. ) × 100.

The common resin member or the common resin material in the plurality of resin layers 22a1, 22a2 of the edge 22 can be a polyetheretherketone resin, a polyetherimide resin, or a polyester-based resin. Further, the soft layer 22b of the edge 22 can be made of, for example, an acrylic resin. If necessary, the soft layer 22b can be made of a water-dispersible resin material (emulsion-based resin) or a pressure-sensitive adhesive.

FIG. 2 is an explanatory diagram showing another embodiment of the vibrating unit mounted on the speaker device according to the embodiment of the present invention. In the vibrating portion 20, the vibrating body 21 and the edge 22 are connected via the voice coil supporting portion 27. The voice coil 25 is supported by the voice coil support portion 27. The density of the constituent members of the voice coil support portion 27 is made smaller than the density of the constituent members of the vibrating body 21 and the edge 22.

In the illustrated example, the vibrating body 21 has a dome shape, and the upper end portion of the voice coil support portion 27 is connected to the outer peripheral portion thereof. As the vibrating body 21, for example, a metal material such as aluminum or magnesium can be used as a material different from the edge 22. The inner peripheral portion of the edge 22 is connected to the outer peripheral side surface of the voice coil support portion 27, and the outer peripheral portion of the edge 22 is connected to the stationary portion 10. As described above, the edge 22 can be composed of a plurality of resin layers 22a1, 22a2 and a soft layer 22b. As the voice coil support portion 27, a lightweight member such as paper can be used. According to this, it is possible to improve the acoustic characteristics while reducing the size and weight of the speaker device 1.

FIG. 3 is a cross-sectional view showing the overall configuration of the speaker device according to the embodiment of the present invention, and FIG. 4 is a partially enlarged cross-sectional view thereof. The speaker device 1 includes a stationary unit 10, a vibrating unit 20, and a magnetic circuit 30. The vibrating unit 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 by the vibrating body 21 directly or via another member. The magnetic circuit 30 includes a magnetic gap 30G composed of 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 arranged in the magnetic gap 30G. The vibrating portion 20 is oscillatedly supported by the stationary portion 10. In FIG. 3, the first magnetic pole portion 31 is the plate 34, and the second magnetic pole portion 32 is composed of the 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. Note that FIG. 3 shows that the edge 22 is arranged on the magnetic circuit 30 side with respect to the upper surface of the vibrating body 21. In particular, the inner peripheral portion of the edge 22 is joined to the lower surface of the vibrating body 21 directly or via another member such as an adhesive.

[Structure of vibrating part and positional relationship between vibrating part and other parts]
The vibrating body 21 itself has rigidity, and the outer peripheral portion 21A of the vibrating body 21 having rigidity projects to the outside of the voice coil 25. By projecting the outer peripheral portion 21A to the outside of the voice coil 25 in this way, the edge 22 approaches the yoke 33 from a position separated by the protrusion of the outer peripheral portion 21A from the voice coil 25 supported by the vibrating body 21. It will be curved. Therefore, when the voice coil 25 vibrates in the magnetic gap 30G, the vibrating body 21 has a structure in which the curved portion of the edge 22 does not easily interfere with the upper portion of the second magnetic pole portion 32 (yoke 33).

Further, in the illustrated example, the outer peripheral portion 21A of the vibrating body 21 is arranged near or outside the position of the second magnetic pole portion 32 in the radial direction (Y direction in the drawing). That is, as shown in FIGS. 4 and 5, the outer peripheral portion 21A of the vibrating body 21 is arranged on the wall portion 33B of the yoke 33 which is the second magnetic pole portion 32. Further, the outer peripheral 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 peripheral portion 21A of the vibrating body 21 is arranged near or outside the position of the inner side surface of the wall portion 33B. Further, the present invention is not limited to the illustrated example, and may be arranged near or outside the position of the outer side surface of the wall portion 33B. According to this, when the curved portion of the edge 22 is formed from the outer peripheral portion 21A, the curved portion of the edge 22 is formed at an outer position exceeding 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) forming the magnetic gap 30G.

FIG. 5 shows the details of the edge 22. The edge 22 is arranged on the second magnetic pole portion 32, and has a first curved portion 23 having a convex shape in the acoustic radiation direction (X direction in the drawing) and a concave second curved portion 24. It has. The second curved portion 24 is continuously provided on the first curved portion 23. In this way, a part of the second curved portion 24 continuous with the first curved portion 23 is less likely to interfere with the second magnetic pole portion 32. Specifically, since the second curved portion 24 is separated from the wall portion 33B of the yoke 33 by the size of the first curved portion 23 in the radial direction, it is less likely to interfere with the second magnetic pole portion 32.

The first curved portion 23 is arranged on and near the second magnetic pole portion 32, and the second curved portion 24 is arranged outside the first curved portion 23. As a result, the top 24C of the second curved portion 24 can be positioned outside the second magnetic pole portion 32 (on the Y direction side), and the top 24C that is most likely to interfere is the second magnetic pole portion 32 (yoke 33). It is possible to install it at a position away from.

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 arranged at a position higher than the inner peripheral portion 24A of the second curved portion 24 with respect to the second magnetic pole portion 32. That is, 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. By comparison, 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.

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 arranged 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 arranged 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 the first. It is arranged at substantially the same height as the top 23C of the curved portion 23 of 1. 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 is located on the vibrating body 21 side and away from the second magnetic pole portion 32. Can be provided.

Further, the first curved portion 21 has a length L1 along the radial direction. The second curved portion 24 has a length obtained by adding the lengths L2 and L3 along the radial direction. Here, the length L2 is the length from the inner peripheral portion 24A to the top 24C of the second curved portion 24, and the length L3 is the length from the top 24C to the outer peripheral portion 24B of the second curved portion 24. is there. By providing the first curved portion 23 between the second curved portion 24 and the vibrating body 21, the top portion 24C of the second curved portion 24 is separated from the second magnetic pole portion 32 by the length L1. It can be installed at a fixed position. 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, and the second curved portion 24 is the second magnetic pole portion. Interference with 32 can be suppressed.

When the vibrating body 21 is stationary (when no voice current is input to the voice coil 25), the outer peripheral portion 22B of the edge 22 is higher or substantially the same height as the inner peripheral portion 22A of the edge 22. Have been placed. With the vibration of the voice coil 25, the inner peripheral portion 22A of the edge 22 vibrates up and down from the outer peripheral portion 22B of the edge 22. As described above, the speaker device 1 can be made thinner by adopting a structure in which the inner peripheral portion 22A of the edge 22 does not protrude from the outer peripheral portion 22B of the edge 22 toward the acoustic radiation side.

The second curved portion 24 has a top portion 24C provided between the inner peripheral portion 24A and the outer peripheral portion 24B thereof. The top portion 24C of the second curved portion 24 is arranged outside the position of the second magnetic pole portion 32 and is provided at a position higher than the position of the second magnetic pole portion 32. By arranging in this way, the top portion 24C of the second curved portion 24 may approach the second magnetic pole portion 32 due to the vibration of the voice coil 25, but a part of the second curved portion 24 is It can be arranged so as not to come into contact with the second magnetic pole portion 32.

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

The bending diameter R1 of the first bending portion 23 is smaller than the bending diameter R2 of the second bending portion 24, and the first bending portion 23 has a bending rigidity larger than that of the second bending portion 24. When the bending diameter R1 of the first bending portion 23 is relatively large, the first bending portion 23 is likely to bend (deform easily) and may easily interfere with the second magnetic pole portion 32. In addition, unnecessary resonance (including split resonance and reverse resonance) may occur. In addition, a rolling phenomenon may be induced by the occurrence of this unnecessary resonance. When the bending diameter R1 of the first bending portion 23 is made relatively small as described above, it is possible to suppress the occurrence of unnecessary resonance and improve the acoustic characteristics.

The second curved portion 24 of the edge 22 includes a reinforcing portion 24E protruding from the surface 24D of the second curved portion 24 along the radial direction thereof, and the reinforcing portion 24E of the second curved portion 24 is a second. It is arranged between the outer peripheral portion 24B and the inner peripheral portion 24A of the curved portion 24 of the above, and extends to the vicinity of the outer peripheral portion 23B of the first curved portion 23. In the illustrated example, the reinforcing portion 24E extends from the vicinity of the position of the inner peripheral portion 24A of the second curved portion 24 to the vicinity of the position of the outer peripheral portion 24B. According to this, the reinforcing portion 24E can effectively secure the amplitude of the vibrating body 21 by the second curved portion 24 having a large curved diameter. Further, since the reinforcing portion 24E imparts an appropriate rigidity to the second curved portion 24, the edge 22 can support the vibrating body 21 at a predetermined position. Further, it is possible to prevent the voice coil 25 from causing a rolling phenomenon (rolling). Further, when the vibrating body 21 vibrates, the edge 22 is deformed in the circumferential direction, which may cause wrinkles at the corners of the edge. Further, due to the occurrence of this wrinkle, a rolling phenomenon may occur in the voice coil 25. The reinforcing portion 24E has a shape that expands and contracts its shape along the circumferential direction. Specifically, the reinforcing portion 24E has a top portion, and the shape of the reinforcing portion 24E expands and contracts when the reinforcing portion 24E bends or bends at the top portion. It is possible to prevent wrinkles from being generated at the corners of the edge 22 due to the bending motion or the refraction motion of the reinforcing portion 24E. Further, the occurrence of the rolling phenomenon of the voice coil 25 can be suppressed.

Generally, when the speaker device is made thinner or smaller, it is conceivable to make the diaphragm and the magnetic circuit closer to each other to make the speaker device thinner, or to make the frame closer to the magnetic circuit to make the speaker device smaller. At this time, since the concave edge is arranged in a state of being close to the yoke of the magnetic circuit, there may be a problem that the edge contacts the yoke when the diaphragm vibrates. In addition, such contact may cause abnormal noise.

By providing the above-mentioned structure, the speaker device 1 has a structure in which the edge 22 does not easily come into contact with the second magnetic pole portion 32 (yoke 33) which is a constituent member of the magnetic circuit 30 when the vibrating body 21 vibrates. Therefore, even when the speaker device 1 is made thinner by bringing the vibrating body 21 closer to the magnetic circuit 30, it is possible to suppress the contact between the edge 22 and the yoke 33 and the generation of abnormal noise due to this contact. become.

That is, the speaker device 1 is outside the connection position between the rigid vibrating body 21 and the voice coil 25 in order to suppress the contact between the edge 22 and the yoke 33 and to reduce the thickness or size of the speaker device 1. It also includes an outer peripheral portion 21A of the vibrating body 21 arranged in the vicinity of the second magnetic pole portion 32. Further, the speaker device 1 has a first curved portion 23 which is a convex curved portion and a second curved portion 24 which is a concave curved portion while being arranged outside the first curved portion 23. The edge 22 is provided. By providing the speaker device 1 with such a vibrating portion 20, it is possible to reduce the size and thickness of the speaker device 1 and prevent the edge 22 from coming into contact with the yoke 33 and the generation of abnormal noise due to the contact. can do.

The illustrated edge 22 has an inner peripheral portion 22A, but the edge 22 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. Further, the vibrating body 21 may have a two-layer structure of an elastic member and a rigid member formed integrally with the edge 22. In this case, the elastic member is arranged on the magnetic circuit 30 side with respect to the rigid member, as compared with the case where the elastic member is arranged on the acoustic radiation side with respect to the rigid member. , The speaker device 1 can be made thinner.

By providing the top portion 23C of the first curved portion 23 in the vicinity of the outer peripheral portion 21A of the vibrating body 21 having rigidity, a part of the first curved portion 23 vibrates even while the vibrating body 21 is vibrating. It is possible to maintain substantially the same height as the body 21 and suppress contact with the second magnetic pole portion 32. Further, 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.

As the speaker device is miniaturized, there is a problem that the effective vibration area of the vibrating body also becomes smaller. By arranging the outer peripheral portion 21A of the vibrating body 21 outside the voice coil 25 and further extending to the vicinity of the top 23C of the first curved portion 23, a relatively large effective area of the vibrating body 21 can be obtained. .. Further, while making the bending diameter R1 of the first bending portion 23 relatively small (while maintaining the rigidity), the top portion 23C is located at a position away from the outer peripheral portion 21A of the vibrating body 21, and is substantially the same as the vibrating body 21. By arranging them at the same height, a part of the first curved portion 23 can be made a part of the vibrating body 21. In this case, the effective vibration area of the speaker device 1 can be made relatively large.

Not limited to the above description, the inner peripheral portion 22A of the edge 22 may be 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, contact between the two can be suppressed, and the amplitude of the vibrating body 21 can be relatively increased.

By arranging the top portion 24C of the second curved portion 24 outside 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 the edge 22 from coming into contact with the second magnetic pole portion 32. Further, since the distance between the first curved portion 23 and the second magnetic pole portion 32 can be made relatively large, the contact between the first curved portion 23 and the second magnetic pole portion 32 can be suppressed.

The vibrating body 21 includes a rigid vibrating member 21B having rigidity, and the rigid vibrating member 21B has carbon as a component. As shown in FIG. 6, the rigid vibration member 21B has a foam layer 21C having a foam structure and a coating layer 21D covering the foam layer 21C.

The edge 22 is made of a resin member. Further, the vibrating body 21 having the rigid vibrating member 21B has substantially the same shape as the rigid vibrating portion 21B in the illustrated example, is composed of polyetherimide, has a density of about 1.27 g / cm3, and has a Young's modulus. It has a small density and a large rigidity with respect to a comparative vibrating body of about 4 MPa. Further, the thickness of the vibrating body 21 is formed to be smaller than the total height of the edge 22.

The magnitude obtained by dividing the Young's modulus of the vibrating body 21 by the density is larger than the magnitude obtained by dividing the Young's modulus of the comparative vibrating body described above by the density. Further, the rigid vibrating member 21B substantially composed of only carbon has a density of about 0.5 g / cm3, a Young's modulus of about 7 GPa, a bending strength of about 25 MPa, and a thickness of about 0.3 mm. is there.

By forming the vibrating body 21 with a member containing carbon as a main component, the vibrating body 21 can be made lightweight and thin. Further, the weight is lighter and the rigidity is higher than that of the above-mentioned comparative vibrating body made of the resin member constituting the edge 22. In the illustrated example, the rigid vibrating member 21B has a foam layer 21C having a foam structure and two coating layers 21D covering the front surface and the back surface of the foam layer 21C. The coating layer 21D forms a substantially continuous surface. Therefore, by providing the coating layer 21D on the surface of the foam layer 21C, sound waves propagating from the back surface side (magnetic circuit 30 side) of the vibrating body 21 pass through the vibrating body 21 and are emitted in the acoustic radiation direction. Can be suppressed and the acoustic characteristics can be improved.

[Structure of magnetic circuit]
As shown in FIG. 3, the magnetic circuit 30 includes a yoke 33, a magnet 35 supported by the yoke 33, and a plate 34, and the yoke 33 has a bottom surface portion 33A magnetically connected to the magnet 35 and a bottom surface portion. It is provided with a wall portion 33B erected from 33A. A magnetic gap 30G is arranged between the plate 34 as the first magnetic pole portion 31 and the wall portion 33B of the yoke 33 as the second magnetic pole portion 32. In the illustrated example, the bottom surface 33A of the yoke 33 has a flat plate shape.

Further, as shown in FIG. 6, which is a cross-sectional view taken along the line X1-X1 of 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. I have. The yoke 33 includes a bottom surface portion 33A that is magnetically connected to the magnet 35, an inner magnet 35A is arranged inside the voice coil 25, an outer magnet 35B is arranged outside the voice coil 25, and the plate 34 is inside. Arranged on one of the magnet 35A or the outer magnet 35B, the first magnetic pole 31 is the plate 34 or the inner magnet 35A, and the second magnetic pole 32 is the plate or outer magnet 35B on 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.

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 of (pair) outer magnets (the other magnet) 35B are arranged at opposite positions with the inner magnet (one magnet) 35A interposed therebetween. Further, the yoke 33 includes a plurality of wall portions 33B facing each other. An outer magnet (the other magnet) 35B is arranged between the wall portions 33B of the yoke 33 in the circumferential direction, and each outer magnet 35B is magnetically connected to the bottom surface portion 33A of the yoke 33 and arranged. There is.

The orientation of the magnet 35 is formed along the thickness direction of the magnet 35, but as an example, as shown in FIG. 8, it can be formed obliquely with respect to the thickness direction. Here, of the inner magnet 35A or the outer magnet 35B, one magnet 35A (35B) has the orientation of the magnet 35A (35B) along the thickness direction of the magnet 35A (35B), and the other magnet 35B. In (35A), the direction of orientation of the magnet 35B (35A) is oblique to the direction of the thickness of the magnet 35B (35A). In the illustrated example, the outer magnet 35B is oriented diagonally with respect to the thickness direction, but the outer magnet 35B is oriented diagonally with respect to the thickness direction, and the inner magnet 35A is oriented diagonally with respect to the thickness direction. You may. When the orientation of the inner magnets 35A is oblique, for example, a plurality of rod-shaped inner magnets 35A are arranged in an annular shape on the yoke 33. Further, the orientation of the inner magnet 35A and the outer magnet 35B may be oblique with respect to the thickness direction. In this case, a plurality of rod-shaped inner magnets 35A and a plurality of rod-shaped outer magnets 35B are arranged in an annular shape on the yoke 33. Further, the orientation of the inner magnet 35A and the outer magnet 35B may be formed along the thickness direction. In that case, the inner plate is placed on the inner magnet 35A, and the outer plate is placed on the outer magnet 35B. In any case, the orientation of the magnets of the inner magnet 35A and the outer magnet 35B is substantially constant in the thickness direction of the magnets. That is, the orientation does not change substantially in the thickness direction of the magnet. Further, in the illustrated example, the orientation of the outer magnet 35B is diagonally downward to the right, but is not limited to this. For example, when 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 generated from the magnet 35 passes through the magnet 35 and the yoke 33 to form a magnetic loop (closed circuit).

At this time, the magnetic flux generated by the outer magnet (the other magnet) 35B passes through a position away from the yoke 33, and a magnetic gap 30G is formed in the vicinity of the position through which the magnetic flux passes. That is, the magnetic gap 30G is a position through which the magnetic flux passes, and is above a part of the yoke 33 which is different from the position of the outer magnet (the other magnet) 35B as the magnetic pole portion and the position of the outer magnet (the other magnet) 35B. It is formed between the magnetic pole portion (plate 34) provided in the above.

Further, in the illustrated example, the magnetic circuit 30 has an inner magnet 35A, an outer magnet 35B, a yoke 33, and a plate 34, but the wall portion 33B of the yoke 33 may be arranged instead of the outer magnet 35B. I do not care.

When driving the speaker device 1, a voice signal is input to the voice coil 25. With the input of this audio signal, Joule heat is generated in the voice coil 25. The Joule heat may increase the temperature inside the magnetic circuit 30. Generally, when the temperature in the magnetic circuit rises, the problem of high temperature demagnetization may occur.

Further, if the Joule heat is not sufficiently dissipated from the voice coil 25 as radiant heat, the temperature of the voice coil 25 and the leader wire 26 may become relatively high. Generally, when the temperature of the voice coil or the leader wire becomes relatively high, the problem of disconnection of the voice coil or the leader wire may occur.

Further, by repeating the driving of the speaker device 1, the voice coil 25 and the leader wire 26 may be in a high temperature state or a normal temperature state. Further, in the environment in which the speaker device 1 is used, the voice coil 25 or the leader wire 26 may be in a low temperature state. By repeating such a cycle of a high temperature state and a normal temperature state or a high temperature state and a low temperature state, a load generally acts on the voice coil or the leader wire, and there is a concern that the wire may be disconnected.

In the embodiment of the present invention, the heat of the voice coil 25 or the leader wire 26 can be dissipated by propagating it to the constituent members of the magnetic circuit 30 or the frame 11 as the stationary portion 10, and the high-temperature demagnetization described above can be performed. It may contribute to solving the problem of disconnection. Examples of the heat propagation path include a voice coil 25 (including the leader wire 26), a plate 34, magnets 35A and 35B, a yoke 33, and a frame 11 in this order. Further, a propagation path propagating from the wall portion of the yoke 33 to the frame 11 is also conceivable. The heat propagation path is not limited to this, and heat is transferred to the constituent members of the magnetic circuit 30 or the vibrating portion 20 arranged in the vicinity of the voice coil 25 or the leader wire 26, other constituent members, and the outside. A propagating route is also conceivable.

Further, since the magnet has a relatively large heat capacity, it can contribute to efficiently propagating the heat of the voice coil 25 and the leader wire 26. In particular, the magnetic circuit 30 in which the magnetic circuit 30 is a combined type in which the inner magnetic type and the outer magnetic type are used in combination includes an outer magnet as opposed to the inner magnetic type magnetic circuit. Therefore, the combined type magnetic circuit is larger in terms of the number of magnets and larger in terms of the surface area of the magnets than the internal magnetic type magnetic circuit. At this time, the heat capacity of the entire magnetic circuit 30 may become relatively large, and more heat may be released from the voice coil 25 or the leader wire 26.

Further, when the magnetic circuit 30 is an outer magnetic type or a combined type, the outer diameter of the yoke 33 may be larger than that of the internal magnetic type magnetic circuit. At this time, the heat capacity of the entire magnetic circuit 30 becomes relatively large, and it may be possible to greatly contribute to the release of heat from the voice coil 25 or the leader wire 26.

In the example shown in FIG. 7, the outer magnet (the other magnet) 35B has a shape (a rectangular shape long in one direction) defined by a major axis and a minor axis. Further, the outer magnet (the other magnet) 35B is provided with an orientation determining portion 36 formed by the cutout portion 35B1. The orientation determination portion 36 (notch portion 35B1) is provided to clearly indicate the orientation of the orientation formed obliquely with respect to the thickness direction. Here, the surface on which the notch 35B1 is not formed is directed to the magnetic gap 30G side. Further, by arranging the surface on which the notch portion 35B1 is formed on the wall portion 33B side of the yoke 33 and outside the yoke 33, the orientation of the magnet can be arranged along an appropriate direction.

When the outer magnets (the other magnets) 35B and 35B having substantially the same outer shape are used, there is a problem that it is not possible to identify the direction in which the magnets are oriented. Therefore, in order to identify the orientation of the magnet and arrange the other magnet at an appropriate position, an orientation determination unit 36 for determining the orientation is provided. The orientation discriminating portion 36 can be formed by a notch 35B1 or the like provided in the magnet 35 as described above, but is not limited to this, and can also be formed by giving an arrow or the like to the surface of the magnet.

As described above, in the magnet 35 in the magnetic circuit 30 of the speaker device 1, the orientation of the first magnet (either the inner magnet 35A or the outer magnet 35B) is in the thickness direction, and the second magnet (outer magnet 35B) is oriented in the thickness direction. And the inner magnet 35A) are oriented diagonally with respect to the thickness direction. The magnetizing direction may be along the orientation of the magnet, or may be different from the orientation of the magnet. By using a magnet whose orientation is diagonal, it is possible to suppress the occurrence of magnetic leakage (the magnetic flux goes toward the yoke 33 below and does not pass through the magnetic gap 30G), and the magnetic flux density in the magnetic gap 30G is relatively large. it can. Further, the peak position of the magnetic flux density in the magnetic gap 30G can be set at a position distant from the yoke 33 and at a relatively high position. Therefore, even if the magnetic circuit 30G is made thinner, the 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 made relatively large.

As for the orientation discriminating unit 36, when a magnet having an oblique orientation is used and a magnet having a thickness direction is also used at the same time, it becomes difficult to distinguish between the two during production. In addition, it takes unnecessary time to confirm which direction of the magnet is the oblique direction. Therefore, for example, when a magnet having 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) to determine the type of magnet. It is said.

[Magnetic circuit mounting structure]
9 to 11 show a mounting structure for mounting the magnetic circuit on the stationary portion. 9 is a plan perspective view in a state where a magnetic circuit is mounted in a stationary portion, FIG. 10A is a sectional view taken along line X2-X2 in FIG. 9, FIG. 10B is a sectional view taken along line X3-X3 in FIG. Shows a rear perspective view of a state in which a magnetic circuit is mounted in a stationary portion. The speaker device 1 includes a frame 11 as a stationary portion 10, and the frame 11 includes an outer peripheral cylinder portion 11A to which the yoke 33 of the magnetic circuit 30 is attached, and a bottom surface portion 11B having an opening 11B1.

The outer peripheral cylinder portion 11A of the frame 11 includes one or a plurality of recesses 11A2 in the lower end portion 11A1. Further, the yoke 33 includes a protruding portion 33C that protrudes from the bottom surface portion 33A toward the frame 11. A part of the yoke 33 is arranged in the opening 11B1 of the frame 11, the protruding portion 33C of the yoke 33 is arranged in the recess 11A2 of the frame 11, and the yoke 33 and the frame 11 are attached. The lower surface 33E of the yoke 33 is arranged at the position on the vibrating body 21 side or substantially the same position with respect to the lower surface 11C of the frame 11. The frame 11 can be formed of a resin member or the like.

Between the frame 11 and the outer magnet 35B, a joining member accumulating portion 51 for accumulating the joining member 50 for joining the frame 11 and the outer magnet 35B is provided. The joining member accumulating portion 51 includes a predetermined gap 52. The gap 52 is composed of a first gap provided between the protruding portion 11E of the frame 11 and the outer magnet 35B, and a second gap provided between the inner side surface 11D of the frame 11 and the outer magnet 35B. Will be done. The frame 11 has an inner side surface 11D as a side surface facing the outer magnet. The protruding portion 11E forming the first gap projects inward from the inner side surface 11D of the frame 11 facing the outer magnet 35B, and is provided on the outer magnet 35B. The second gap is arranged on the yoke 33 side with respect to the first gap and has a width larger than the width of the first gap in the radial direction. The gap 52 is filled with a joining member 50 that joins the frame 11 and the outer magnet 35B.

A passage 37 is provided between the magnetic circuit 30 and the frame 11 on the lower surface side of the outer magnet 35B. The passage 37 communicates the outside with the gap 52 provided between the frame 11 and the outer magnet 35B.

In an electronic device or the like equipped with the speaker device 1, the space inside the device is limited. On the back side of the speaker device 1, an external terminal of an electronic device that electrically contacts the terminal portion 12 of the speaker device 1 is provided. Here, it is assumed that, for example, the yoke 33 projects toward the electronic device side with respect to the frame 11 as a constituent member constituting the magnetic circuit 30. The yoke 33 is made of a conductive member, and the frame 11 is made of an insulating member such as resin. In this case, electrical contact between the conductive yoke 33 and the external terminal may occur, which may cause a problem of malfunction of the electronic device. In particular, since the speaker device for a mobile phone is relatively small, if the shape tolerance of the yoke 33 is large, a part of the yoke 33 from the frame 11 may protrude. Therefore, by providing the recess 11A2 in the frame 11 and arranging the protruding portion 33C of the yoke 33 in the recess 11A2, it is possible to prevent a part of the yoke 33 from protruding. As a result, the speaker device 1 can be arranged in a predetermined space, and the electronic device can be made thinner while avoiding contact between the yoke 33 and the external terminal.

More specifically, the recess 11A2 of the frame 11 is a positioning portion that determines the position of the yoke 33 with respect 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. Further, when the speaker device 1 is made thinner, it is possible to prevent a part of the yoke 33 from protruding due to the tolerance of the shape of the yoke 33 or the like. Further, it is possible to suppress a malfunction of the electronic device caused by a part of the yoke 33 being in electrical contact with the external terminal. Further, even when other constituent members constituting the magnetic circuit 30 project with respect to the frame 11, it is possible to prevent electrical contact with the external terminal portion.

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 in the radial direction in order to make the magnetic gap 30G a specified width. .. Further, if the outer magnet 35B has a width larger than a desired width (has a tolerance), if the width of the magnetic gap 30G is prioritized, the outer magnet 35B may not be installed in the frame 11. In order to solve this problem, a predetermined gap 52 is provided between the frame 11 and the outer magnet 35B. Within this gap 52, a part of the outer magnet 35B having a width substantially the same as the tolerance is arranged. As a result, the magnetic gap 30G can be set to a specified width. Further, the outer magnet 35B can be arranged in the frame 11.

In order to join the frame 11 and the outer magnet 35B, the joining member 50 is filled in the gap 52. A protrusion 11E is provided on the inner side surface 11D of the frame 11. When the joining member 50 is filled, the protruding portion 11E can prevent the joining member 50 from leaking above the outer magnet 35B. Further, a predetermined gap serving as a passage 37 communicating with the outside is provided between the frame 11 and the yoke 33. The injection port (dispenser) of the injector that injects the joining member 50 can be inserted into the passage 37. Further, the joining member 50 can be filled between the frame 11 and the outer magnet 35B.

The frame 11 includes a bottom surface portion 11B that comes into contact with the bottom surface portion 33A of the yoke 33, and an outer peripheral cylinder portion 11A that surrounds the magnetic circuit 30 and supports the edge 22. A gap 52 is provided between the outer peripheral cylinder portion 11A of the frame 11 and the second magnet (outer magnet 35B). The joining member 50 is filled in the gap 52, and the frame 11 and the second magnet (outer magnet 35B) are joined. The gap 52 is provided with a predetermined gap on the frame 11 side from the outer peripheral side surface of the second magnet (outer magnet 35B), and the second magnet (outer magnet 35B) is provided in the frame 11 according to the size (tolerance) of the magnet. ) Is included in the magnetic circuit 30.

For example, the size of the speaker device 1 mounted on a mobile phone is predetermined. Further, the speaker device 1 needs to effectively utilize the specified dimensions in order to satisfy the requirements such as keeping the specified dimensions and increasing the electromagnetic force of the voice coil 25 relatively. Further, the positions of the constituent members in the speaker device 1 are defined with relatively high accuracy so as to have the specified dimensions. Therefore, if there are a plurality of constituent members and there is a tolerance between the constituent members, and the positions of the constituent members are displaced, the constituent members cannot be arranged at the specified positions, or the speaker device exceeds the specified dimensions. There is. Therefore, in order to reduce the deviation due to the tolerance of the constituent members, a recess 11A2 is provided in the outer peripheral cylinder portion 11A of the frame 11 facing the yoke 33, and the protruding portion 33C of the bottom surface portion 33A of the yoke 33 is arranged in the recess 11A2. At this time, a part of the yoke 33 corresponding to the tolerance is arranged in the recess 11A2 of the frame 11. With such an arrangement, the deviation due to the tolerance of the constituent members can be reduced, and the speaker device 1 can be made thinner. Therefore, it is possible to arrange the other constituent members at the specified positions and to make the speaker device 1 have the specified dimensions.

12 (a) and 12 (b) are explanatory views showing another example in the mounting structure of the magnetic circuit. In the example of FIG. 3A, the first magnetic pole portion 31 is formed by the inner plate 34A, the second magnetic pole portion 32 is formed by the outer plate 34B, and a magnetic gap 30G is formed between them. Then, when the magnetic circuit 30 is attached to the stationary portion 10, the upper surface of the outer plate 34B is brought into contact with the fixed surface 11E1 formed on the lower surface of the protruding portion 11E of the frame 11. Further, in the example of FIG. 3B, the upper surface of the yoke 33 is brought into contact with the fixed surface formed on the bottom surface portion 11B of the frame 11, and the magnetic circuit 30 is attached to the stationary portion 10. Further, in the example of FIG. 12A, the inner magnet 35A and the outer magnet 35B have substantially the same thickness. Further, the thickness of the outer plate 34B is larger than the thickness of the inner plate 34A. As a result, the outer plate 34B can provide a relatively large gap between the outer plate 34B and the edge 22 arranged above the outer plate 34B. Further, in FIG. 12A, the orientation of the inner magnet 35A and the outer magnet 35B may be oriented along the thickness direction. In this case, a magnetic gap 30G is substantially formed between the inner plate 34A and the outer plate 34B. Further, in FIG. 12B, the orientation of the outer magnet 35B may be oblique to the thickness direction, and the orientation of the inner magnet 35A may be along the thickness direction. In this case, the magnetic gap 30G is substantially formed by the inner plate 34 and the outer magnet 35B.

[Arrangement of leader lines and prevention of disconnection]
FIG. 4 shows a cross-sectional view of the voice coil 25 and the leader line 26. It includes a leader wire 26 drawn from the lower end portion 25A of the voice coil 25, and a plurality of terminal portions 12 for electrically connecting the voice coil 25 to the outside via the leader wire 26. The frame 11 is provided with the terminal portion 12. The yoke 33 includes a plurality of wall portions 33B erected from the bottom surface portion 33A and a notch 33F provided between the adjacent wall portions 33B. The leader line 26 of the voice coil 25 passes through the notch 33F, and passes through the drawer passage 38 provided between the wall portion 33B of the yoke 33 and the inner side surface 11D of the frame 11 facing the wall portion 33B. It is connected to the terminal portion 12.

As shown in FIG. 9, the plurality of terminal portions 12 provided on the frame 11 are arranged on the side of one region 25N1 of the two regions 25N1,25N2 partitioned by the long axis 25L of the voice coil 25. .. In the illustrated example, a plurality of leader lines 26 are provided. Further, the leader position of the leader line 26 drawn from the voice coil 25 is arranged on the side of the other region 25N2.

That is, on the outside of the voice coil 25, a second magnet (outer magnet 35B) is arranged on the yoke 33. A leader line 26 is pulled out from the lower end portion 25A of the voice coil 25. The leader line 26 is routed toward a plurality of terminal portions 12 arranged on one side of the two regions separated by the long axis 25L passing through the central position of the voice coil 25. The lead-out position of the leader line 26 is near the corner portion of the voice coil 25, specifically, is drawn out from a substantially straight portion among a plurality of curved portions and straight portions of the voice coil 25. The bottom surface 33B of the yoke 33 corresponding to the leader position of the leader line 26 is provided with a retracting portion 40 from which the leader line 26 is retracted. The retracted 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 drawer passage 38 around which the leader line 26 is routed is formed between the notch 33F, the wall portion 33B of the yoke 33, and the inner side surface 11D of the frame 11. A part of the leader wire 26 on the end side is electrically connected to the terminal portion 12, and an audio signal is input to the voice coil from the outside.

The leader line 26 of the voice coil 25 has a leader portion 26A drawn across the end surface of the voice coil 25 opposite to the vibrating body 21 side (see FIG. 4). The magnetic circuit 30 has a bottom surface portion 33A facing the end surface of the voice coil 25 arranged in the magnetic gap 30G, and the bottom surface portion 33A is in contact with the bottom surface portion 33A with the lower end surface 25A of the voice coil 25. A retracting portion 40 is formed in which the drawer portion 26A retracts when they are close to each other. That is, the yoke 33 (stationary portion 10) facing the lower end portion 25A of the voice coil 25 is provided with a retracting portion 40 in which the leader portion 26A of the leader wire 26 drawn from the voice coil 25 retracts (FIGS. 4 and 4). 9). The retracting portion 40 from which the drawer 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 impact from the outside and the leader wire 26 from being disconnected. The retracted portion 40 has a concave cross section.

[Structure of terminal part]
13 to 15 are explanatory views showing the structure of the terminal portion. FIG. 15 is a perspective view of a part of the outer peripheral cylinder portion 11A of the frame 11 as viewed from the magnetic circuit 30 side. The terminal portion 12 includes a first contact portion 12A that comes into contact with 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 leader wire 26 of the voice coil 25. A second contact portion 12B electrically connected to the frame 11 is provided, and the frame 11 includes a fixing portion 14 for fixing the terminal portion 12.

The outer peripheral tubular portion 11A of the frame 11 includes a locked portion 11A3 to which the end portion 12C of the first contact portion 12A is engaged, and the locked portion 11A3 has the first contact portion 12A below the frame 11. It regulates moving to. The end portion 12C of the first contact portion 12A is locked to the locked portion 11A3. The end portion 12C of the first contact portion includes a locking portion 12D that locks to the locked portion 11A3. The locking portion 12D has a shape protruding from the end portion 12C of the first contact portion 12A toward the locked portion 11A3. Further, the locking portion 12D of the first contact portion 12A extends in a direction intersecting the direction in which the first contact portion 12A extends.

The outer peripheral cylinder portion 11A of the frame 11 includes a storage portion 11A4 for accommodating the terminal portion 12, and the storage portion 11A4 is a recess formed on the outer side surface 11A5 of the outer peripheral cylinder portion 11A of the frame 11. The outer peripheral tubular portion 11A of the frame 11 includes a moving space 11A6 in which the first contact portion 12A moves along the vibration direction of the voice coil 25.

The locked portion 11A3 included in the outer peripheral tubular portion 11A of the frame 11 can restrict the movement of the first contact portion 12A below the frame 11 (on the housing side of the mobile phone). On the other hand, there is a problem that the elastic support portion 13 repeats the bending motion due to the movement of the first contact portion 12A, and the elastic force thereof decreases. In particular, when the moving width of the first contact portion 12A is large, the decrease in elastic force may become larger. Therefore, the elastic force of the elastic support portion 13 can be maintained for a long period of time by providing the locked portion 11A3 to limit the moving width of the first contact portion 12A.

By arranging the terminal portion 12 in the outer peripheral tubular portion 11A of the frame 11, the speaker device 1 can be made into a predetermined size and can be miniaturized. The outer peripheral cylinder portion 11A of the frame 11 is provided with a moving space (opening) for the first contact portion 12A to move 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. Further, when the external terminal portion is separated from the first contact portion 12A, the contact state is dissociated, and the locked portion 11A3 determines a predetermined distance between the external terminal portion and the first contact portion 12A. Can maintain the distance.

For example, the terminal portion 12 of the speaker device 1 may be electrically connected to the terminal portion (external terminal portion) of the mobile phone. In this case, as described above, the terminal portion 12 also includes a first contact portion 12A, an elastic support portion 13, a second contact portion 12B, and a fixing portion 14. The first contact portion 12A comes into contact with an external terminal portion. Further, 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 leader wire 26 of the voice coil 25. The fixing portion 14 fixes the terminal portion 12 to the frame 11. The end of the first contact portion 12A is provided with a locking portion 12D that is anchored to the frame 11. The locking portion 12D regulates the movement of the first contact portion 12A below the frame 11 (on the housing side of the mobile phone). Further, the locking portion 12D maintains the elasticity of the curved elastic support portion 13 for a long period of time. The frame 11 is provided with a storage portion for accommodating the terminal portion 12 on the outer side surface 11A5 of the outer peripheral cylinder portion 11A so that the speaker device 1 can be accommodated in a predetermined size. The frame 11 includes a moving space 11A6 (opening) for the first contact portion 12A to move along the thickness direction of the speaker device 1. The moving space 11A6 is provided with an opening 11A7 inside the outer peripheral tubular portion 11A of the frame 11. The opening 11A7 is provided at a position adjacent to the locked portion 113, and a part of the locking portion 11D and the first contact portion 12A moves in the opening 11A7. The terminal portion 12 is attached to the frame 11 by a fixing portion 14.

[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, that is, a rectangular outer shape that is long in one direction. As described above, the edge 22 has a first curved portion 23 and a second curved portion 24, so that the edge 22 has a convex cross-sectional shape on the side opposite to the acoustic radiation direction. The edge 22 is provided with one or more protrusions 24E at its corners. The protrusion 24E has a convex cross section on the acoustic emission side, or has a convex cross section on the opposite side to the acoustic emission side. The protrusion 24E extends along the radial direction of the edge 22. The outer peripheral portion of the protrusion 24E is arranged inside the outer peripheral portion 22B (see FIG. 5) of the edge 22, and the inner peripheral portion thereof is arranged inside the inner peripheral portion 22A (see FIG. 5) of the edge 22. The inner peripheral portion 22A of the edge 22 supports the vibrating body 21.

The speaker device 1 includes a frame 11 as a stationary unit 10, a vibrating unit 20, a magnetic circuit 30, and a protective unit 60 that protects the vibrating body 21. The vibrating unit 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 may be circular, elliptical, track-shaped, or the like, regardless of the rectangular shape.

The protective portion 60 covers a part of the edge 22, and the opening 61 exposes the vibrating body 21. The edge 22 supports the vibrating body 21 on the frame 11 by its inner peripheral portion 22A. A magnetic circuit 30 supported by the frame 11 is arranged on the back surface side of the vibrating body 21. The voice coil 25 is supported by the vibrating body 21 via the inner peripheral portion 22A of the edge 22. The vibrating body 21 is made of a material containing carbon as a main component and has electrical conductivity. The voice coil 25 needs to be attached to the vibrating body 21 via an edge 22 made of an insulating material (resin or the like). The magnetic circuit 30 includes a plate 34, a yoke 33, and a magnet 35. The yoke 33 includes a bottom surface portion 33A and a wall portion 33B erected from the bottom surface portion 33A.

As an example, the magnetic circuit 30 employs an inner / outer magnetic type magnetic circuit in which magnets 35A and 35B are arranged inside and outside the voice coil 25. A first space is provided on the front side (acoustic emission side) of the vibrating body 21, and a second space is provided on the back side of the vibrating body 21.

The position of the outer peripheral portion 21A of the vibrating body 21 is arranged near the position of the wall portion 33B of the yoke 33 in the direction intersecting the vibration direction of the voice coil 25. Further, the inner peripheral portion 22A of the edge 22 is also arranged near the position of the wall portion 33B of the yoke 33. At this time, since the vibrating body 21 has flexural rigidity, it is possible to prevent the edge 22 from coming into contact with the wall portion 33B of the yoke 33 when the vibrating body 21 vibrates, and it is possible to prevent the edge 22 from coming into contact with the wall portion 33B of the yoke 33. The position of the peripheral portion 23A or the inner peripheral portion 24A of the second curved portion 24 can be arranged near the position of the wall portion 33B of the yoke 33.

Such a speaker device 1 can be used for electronic devices and in-vehicle use. 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 an attached member included in an electronic device 100 such as a mobile phone or a personal digital assistant as shown in FIG. In this case, the thickness of the electronic device can be made relatively small.

Further, the speaker device 1 can be used for the automobile 200 as shown in FIG. In particular, the speaker device according to the embodiment of the present invention can be attached to a door panel, a ceiling, a rear tray, or a dashboard as a member to be attached. In this case, the thickness of the attached member such as the door panel can be made relatively small, and the riding space can be made relatively large.

FIG. 19 is an explanatory diagram showing another example of an electronic device which is an application example of the speaker device 1 according to the embodiment of the present invention. The electronic device 101 shown in the figure (a) is a personal computer (portable type, notebook type, laptop type, etc.), and the electronic device 102 shown in the figure (b) is a headphone.

The electronic device 101 includes a display unit 101A and an input operation unit 101B, and the input operation unit 101B is 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 a vibrating body is arranged on the operation surface of the input operation unit 101B. Further, not limited to the illustrated example, the display unit 101A may be used as a housing, and one or a plurality of speaker devices 1 may be arranged on the side portions thereof or the like.

The electronic device 102 includes a pair (plurality) of housings 102A and 102A for accommodating the speaker device 1, and an arch-shaped connecting portion 102B connecting the housings 102A and 102A electrically connects the plurality of speaker devices 1. It is a wiring accommodating part that accommodates the wiring connected to.

20 to 22 are explanatory views showing an example of mounting the speaker device according to the embodiment of the present invention in an electronic device. FIG. 20 is an overall configuration diagram showing an example of mounting on the electronic device 101 described above. In the illustrated example, a plurality of housings 110 for accommodating the speaker device 1 in a state where the vibrating body 21 is exposed are provided. A wiring accommodating portion 120 for accommodating wiring for electrically connecting a plurality of speaker devices 1 is provided between the housings 110 and 110. The wiring accommodating portion 120 is provided with a terminal portion 121 for electrically connecting to an electronic device.

21 (a) is an enlarged perspective view of the A1 portion in FIG. 20, and FIG. 21 (b) is an enlarged cross-sectional view of the A2 portion in FIG. 20. In FIG. 21A, the speaker device 1 provided with the vibrating body 21 is housed in the housing 110, and the housing 110 is a frame (first stationary portion) that supports the vibrating portion (vibrating body 21, edge 22). ) 111, and a cabinet 112 (second stationary portion) forming an air chamber between the housing 110 and the vibrating body 21 is provided. The frame 111 includes an outer peripheral cylinder portion that surrounds the vibrating body 21. Further, on the outer peripheral side surface of the outer peripheral cylinder portion of the frame 111, a mounting portion 111A for attaching the frame 111 to the housing 110 of the electronic device is provided. The cabinet 112 is arranged on the back side of the frame 111 (lower side of the magnetic circuit 30).

In FIG. 21B, the speaker device 1 provided with the vibrating body 21 is housed in the housing 110, and the housing 110 is a frame (first stationary portion) that supports the vibrating portion (vibrating body 21, edge 22). ) 111 is provided. In this example, the housing 110 includes a cabinet 112 arranged on the back side of the frame 111. A ventilation path 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 peripheral cylinder portion 113 of the frame 111 and the outer peripheral side portion of the yoke 33. This gap is a ventilation path 111S that communicates the space between the vibrating body 21 and the magnetic circuit 30 and the space between the magnetic circuit 30 and the cabinet 112. Further, the inside of the frame 111 and the air chamber 112S in the cabinet 112 communicate with each other through the ventilation passage 111S. The air chamber 112S is provided near the outside of the edge 22 and on the back side of the yoke 33 of the magnetic circuit 30.

22 is an explanatory view showing the housing of the A1 portion in FIG. 20, where FIG. 22A is an exploded perspective view and FIG. 22B is a rear view of the frame. A yoke 33 of the magnetic circuit 30 is provided on the frame 111 that supports the vibrating body 21 and the edge 22. The notch 33F described above is formed at the four corners of the yoke. The notch 33F corresponds to the ventilation path 111S. An air chamber 112S is provided on the side side of the cabinet 112 attached to the back side of the frame 111. Further, the space inside the frame 111 communicates with the air chamber 112S via the ventilation passage 111S of the frame 111.

Further, the housing 110 includes an inclined surface portion 114 on the outside of the outer peripheral cylinder portion 113. By providing the inclined surface portion 114, the space between the housing 110 and the speaker device 1 can be made relatively large, and the acoustic characteristics can be improved. The electronic device 101 shown in FIG. 19 includes a sound emitting unit (near the position of the speaker device 1 in FIG. 19) that emits sound waves radiated from the speaker device 1 to the outside. The sound emitting portion is formed by providing a plurality of holes in a part of the housing 110. Further, the sound emitting unit communicates the space between the housing 110 and the speaker device 1 with the outside. Therefore, the electronic device 101 is provided with 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 (acoustic radiation side) of the vibrating body. It can be equipped with an acoustic type speaker device.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention. The embodiments shown in the above figures can be combined with each other as long as there is no particular contradiction or problem in the purpose and configuration thereof. Further, the description contents of each figure can be independent embodiments, and the embodiment of the present invention is not limited to one embodiment in which each figure is combined.

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, US patent application US12 / 670819 with a domestic transition date to the United States January 26, 2010, US patent application US12 / 675079 with a domestic transition date to the United States February 24, 2010, domestic transition date to Europe All content of the European patent application EP07807159.4, dated February 23, 2010, is incorporated into this application.

1: Speaker device, 10: Stationary part, 11: Frame, 12: Terminal part,
20: vibrating part, 21: vibrating body, 22: edge,
22a, 22b, 22c: resin layer, 25: voice coil,
26: Leader wire, 30: Magnetic circuit, 31: First magnetic pole part, 32: Second magnetic pole part,
33: York, 34: Plate, 30G: Magnetic gap, 35: Magnet,
37: passage, 38: drawer passage, 39: bottom surface, 40: retracting part, 50: joining member,
51: Joint member reservoir, 52: Gap, 100, 101, 102: Electronic equipment,
110: Housing,
111: Frame (first stationary part), 112: Cabinet (second stationary part),
111S: Ventilation path, 112S: Air chamber, 120: Wiring housing,
200: Car

Claims (1)

A frame with an outer cylinder and
A magnetic circuit that has a yoke and is at least partly located inside the frame.
With
The outer peripheral cylinder portion has one or more recesses, and has one or more recesses.
A speaker device characterized in that a part of the yoke is located in the recess.

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