JP5989739B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device.

  The speaker device includes a diaphragm, a voice coil, and a magnetic circuit as basic components. The conventional speaker device described in Patent Document 1 below includes a relatively flat diaphragm main body whose diaphragm is made of foamed mica or the like, and an 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 main body, and the voice coil is disposed in the magnetic gap of the magnetic circuit.

Japanese Utility Model Publication No. 62-147991

  The speaker device is installed in various electronic devices that generate sound. At this time, for example, in the case of being mounted on a portable electronic device, the speaker device is required to be thin and small in order to improve its portability.

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

In order to achieve such an object, the speaker device according to the present invention has at least the following configuration.
An enclosure including an air chamber and an attachment part for attaching to an electronic device, a vibration part, and a magnetic circuit having a yoke are provided. The casing surrounds the magnetic circuit and is attached to the vibration part. An outer peripheral cylindrical portion of the frame is provided, and there are the attachment portion, the air chamber, and the inclined surface portion on the side of the casing with respect to the outer peripheral cylindrical portion of the frame, and the adjacent walls of the yoke A gap formed between a notch portion provided between the portions and an inner side surface of the outer peripheral cylindrical portion of the frame facing the wall portion is a ventilation that connects the space between the vibrating portion and the magnetic circuit and the air chamber. A speaker device attached to an electronic device, characterized by forming a path.

It is explanatory drawing explaining the speaker apparatus which concerns on embodiment of this invention (the figure (a) is a longitudinal cross-sectional view, the figure (b) is the A section enlarged view). It is explanatory drawing which showed the other form of the vibration part of the speaker apparatus which concerns on embodiment of this invention. 1 is a cross-sectional view showing an overall configuration of a speaker device according to an embodiment of the invention. FIG. 2 is a partial enlarged cross-sectional view of FIG. 1. Explanatory drawing which shows the detail of the edge of the speaker apparatus which concerns on embodiment of this invention. X1-X1 sectional drawing 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 top view, 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. Explanatory drawing which showed the attachment structure which attaches the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention to a stationary part. Explanatory drawing which showed the attachment structure which attaches the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention to a stationary part. Explanatory drawing which showed the attachment structure which attaches the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention to a stationary part. Explanatory drawing which showed the attachment structure which attaches the magnetic circuit in the speaker apparatus which concerns on embodiment of this invention to a stationary part. Explanatory drawing which showed the structure of the terminal part in the speaker apparatus which concerns on embodiment of this invention. Explanatory drawing which showed the structure of the terminal part in the speaker apparatus which concerns on embodiment of this invention. Explanatory drawing which showed the structure of the terminal part in the speaker apparatus which concerns on embodiment of this invention. 1 is an external perspective view showing an overall configuration of a speaker device according to an embodiment of the present invention. 1 is an external perspective view showing an overall configuration of a speaker device according to an embodiment of the present invention. Explanatory drawing which showed the example of application of the speaker apparatus which concerns on embodiment of this invention. Explanatory drawing which showed the example of application of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of mounting to the electronic device of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of mounting to the electronic device of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of mounting to the electronic device of the speaker apparatus which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the following figures is an explanatory view for explaining a speaker device according to an embodiment of the present invention. In the drawings, common portions are denoted by the same reference numerals, and a part of overlapping description is omitted. The illustrated X direction is the acoustic radiation direction, and the illustrated Y direction 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. FIG. 1A is a longitudinal sectional view, and FIG. 1B is an enlarged view of a portion A in FIG. It is.

  The speaker device 1 includes a stationary unit 10, a vibrating unit 20, and a magnetic circuit 30. The vibrating part 20 includes a vibrating body 21 having an outer peripheral part 21A, an edge 22 that supports the vibrating body 21 on the stationary part 10, and a voice coil 25 supported on the vibrating body 21 directly or via another member. . The vibrating body 21 and the edge 22 are composed of different members. The edge 22 has a laminated structure in which a plurality of resin layers 22a1 and 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 and 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 of only a plurality of resin layers 22a1 and 22a2. As will be described later, the edge 22 can be configured in combination with other layers. The magnetic circuit 30 includes a plate, a yoke, a magnet, and the like, which will be described later, forms a magnetic gap 30G, and the voice coil 25 is disposed in the magnetic gap 30G.

  The speaker device 1 includes a vibrating body 21 having rigidity larger 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. Such a speaker device 1 can make the vibrating portion 20 (the vibrating body 21 and the edge 22) relatively thin without providing the vibrating body 21 with a reinforcing portion such as a rib. If necessary, a reinforcing part such as a rib as shown in FIG. 3 to be described later may be provided on the vibrating body 21. Moreover, the edge 22 can be provided with a comparatively large internal loss, being provided with the rigidity which can support the vibrating body 21 oscillating freely by providing a multilayer structure.

  In a thin and small speaker device, 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 be deteriorated 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 be deteriorated. It is also conceivable that the common member of the diaphragm and the edge is made of a relatively soft material, and a reinforcing part such as a rib is provided on the vibrating body to increase rigidity. However, when 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 a reduction in thickness and size of the speaker device. On the other hand, the speaker device 1 described in the present embodiment can improve acoustic characteristics in the low and high frequencies.

  According to the speaker device 1, the high frequency limit frequency can be shifted out of the audible range because the vibrating body 21 has a relatively large rigidity. Further, since the edge 22 has a relatively large internal loss, the peak at the low frequency reproduction frequency can be relatively small. Further, since the vibrator 21 has a relatively large internal loss, the peak value in the vicinity of the high frequency limit frequency can be relatively small, and the acoustic characteristics can be flattened from the low frequency range to the high frequency range.

  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 a comparative edge (having the same thickness as the edge 22 to be compared) composed of a single layer made of the same material as the resin layers 22a1 and 22a2. The internal loss of the edge 22 is larger than the internal loss of the comparative edge described above.

  Since the soft layer 22b is thicker than the resin layers 22a1 and 22a2 at the edge 22 composed of the plurality of resin layers 22a1 and 22a2 and the soft layer 22b, the physical properties of the soft layer are more influenced by the physical properties of the edge 22 than the resin layers 22a1 and 22a2. Is big. That is, the physical property of the soft layer 22b becomes a dominant factor of the physical property of the edge 22, and the internal loss of the edge 22 can be made relatively large. Thereby, 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 and 22a2 included in the edge 22 can be made of a resin member common to each other or a resin material common to the resin members. As a common resin material, it is only necessary that at least one resin material is common among a plurality of different resin materials constituting the resin members constituting the plurality of resin layers 22a1 and 22a2. Here, the common resin member means a resin member having substantially the same density, and a resin member having substantially the same Young's modulus and internal loss. Further, the common resin material means that, like the resin member, resin materials having substantially the same density, and resin materials having substantially the same Young's modulus and internal loss. According to this, for example, when the plurality of resin layers 22a1 and 22a2 of the edge 22 are composed of a common resin member (a resin member having substantially the same Young's modulus, internal loss, and density), Peeling between the resin layers can be suppressed by deformation accompanying shrinkage or the like.

  In addition, if necessary, the plurality of resin layers 22a1 and 22a2 included in the edge 22 can be made of different resin members. For the resin layers 22a1 and 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 formed of a resin member using PEEK as a resin material, and the resin layer 22a2 may be formed of a resin member using PET as a resin material. Further, an edge 22 in which a resin layer having a resin material having a relatively high glass transition temperature is disposed on the voice coil 25 side and a resin layer having a resin material having a relatively low glass transition temperature is disposed on the vibrating body 21 side is used. 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 (the surface facing the magnetic circuit 30; the back surface) on the magnetic circuit 30 side. The voice coil 25 is connected to the vibrating body 21 via the inner peripheral portion 22 </ b> A of the edge 22. The upper end portion of the voice coil 25 is connected to the inner peripheral portion 22 </ b> A of the edge 22.

  In this example, the resin film constituting the resin layer 22a2 disposed on the voice coil side of the edge 22 has a glass transition temperature of 100 ° C. or higher. The resin film is mainly composed of a resin material having a glass transition temperature of 100 ° C. or higher. Specifically, the resin film includes PEN (polyether naphthalate, glass transition temperature = 155 ° C.), PEEK (polyether ether ketone, 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 vibration member. Since a ceramic-based rigid vibration member is used for the vibration body 21, the Joule heat of the voice coil 25 propagates to the edge 22 and the vibration body 21, and the Joule heat is stored in the vibration body 21. Since Joule heat is stored in the vibrating body 21, the temperature of the inner peripheral portion 22 </ b> A of the edge 22 rises, and the edge 22 cannot follow the vibrating body 21 unless the material of the edge 22 is appropriately 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, even if Joule heat is stored in the vibrating body 21, the edge 22 remains vibrating. 21 can be followed. 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 the vibration body 21 can freely vibrate to the stationary part 10 even if the physical properties of the edge 22 change in temperature. Can be supported. In addition, by using a resin film having a relatively high glass transition temperature for the edge 22, the voice coil 25 can be disposed at a predetermined position with respect to the magnetic circuit 30 while the speaker device is being driven. 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 the speaker device is being driven.
Further, if the vibrating body 21 is made of a ceramic-type rigid vibration member, the weight is reduced, so that the sound pressure can be made relatively large.

  In the speaker device 1, a ceramic-type rigid vibration member having a relatively low strength against an external shock is provided by interposing a relatively soft edge 22 between the vibration body 21 between the vibration body 21 and the voice coil 25. Can be used for the vibrator 21. According to this, for example, an electronic device (such as a portable electronic device) on which the speaker device 1 is mounted may fall and be subjected to an impact. At this time, the voice coil 25 may come into contact with a later-described yoke of the magnetic circuit 30 and the voice coil 25 may apply a relatively large external force (impact) to the vibrating body 21 in some cases. At this time, since the vibrating body 21 is connected to the voice coil 25 via the edge 22, it is possible to suppress the occurrence of defects such as a crack in the vibrating body 21. Further, the edge 22 serves as a buffer member that relaxes the external force generated by the voice coil 25.

The rigid vibration member can be substantially made of carbon (for example, carbon ceramics). Further, the rigid vibration member can be constituted by a component member having a foam layer having a foam structure and a coating layer covering the foam layer. The covering layer of the rigid vibration member is a continuously formed layer. The density of the coating layer is greater than the density of the foam layer. Moreover, the porosity of the coating layer is smaller than the density of the foamed layer. The porosity (%) here is (1− [weight of foam layer or coating layer (g)] / [density of constituent material (g / m ³ )] / [volume of foam layer or coating layer (m ³ )]) × 100.

  The common resin member or common resin material in the plurality of resin layers 22a1 and 22a2 of the edge 22 can be a polyether-etherketone 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 composed of a water-dispersed resin material (emulsion resin) or an adhesive.

  FIG. 2 is an explanatory diagram showing another form of the vibration unit equipped in the speaker device according to the embodiment of the present invention. In the vibrating part 20, the vibrating body 21 and the edge 22 are connected via a voice coil support part 27. A voice coil 25 is supported on 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 form of the vibrating body 21 is 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 part of the edge 22 is connected to the outer peripheral side surface of the voice coil support part 27, and the outer peripheral part of the edge 22 is connected to the stationary part 10. As described above, the edge 22 can be constituted by a plurality of resin layers 22a1, 22a2 and a soft layer 22b. As the voice coil support portion 27, for example, a lightweight member such as paper can be used. According to this, the acoustic characteristics can be improved while reducing the size and weight of the speaker device 1.

  FIG. 3 is a 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 sectional view thereof. The speaker device 1 includes a stationary part 10, a vibrating part 20, and a magnetic circuit 30. The vibration unit 20 includes a vibration body 21, an edge 22 that supports the vibration body 21 on the stationary portion 10, and a voice coil 25 that is supported on the vibration body 21 directly or via another member. The magnetic circuit 30 includes a magnetic gap 30G composed of a first magnetic pole part 31 and a second magnetic pole part 32, and a magnet 35 (inner magnet 35B). The voice coil 25 is disposed in the magnetic gap 30G. The vibration part 20 is supported by the stationary part 10 so as to be able to vibrate. In FIG. 3, the first magnetic pole part 31 is a plate 34, and the second magnetic pole part 32 is constituted 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. 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 the vibration part and positional relationship between the vibration part and other parts]
The vibrating body 21 itself has rigidity, and the outer peripheral portion 21 </ b> A of the vibrating body 21 having rigidity protrudes outside the voice coil 25. Thus, by projecting the outer peripheral portion 21 </ b> A to the outside of the voice coil 25, the edge 22 approaches the yoke 33 from a position away from the voice coil 25 supported by the vibrating body 21 by the protrusion of the outer peripheral portion 21 </ b> A. 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 hardly interferes with the upper portion of the second magnetic pole portion 32 (yoke 33).

  In the illustrated example, the outer peripheral portion 21 </ b> A 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 drawing). That is, the outer peripheral portion 21 </ b> A of the vibrating body 21 is disposed on the wall portion 33 </ b> B of the yoke 33 that becomes the second magnetic pole portion 32 as shown in FIGS. 4 and 5. Further, the outer peripheral portion 21 </ b> A of the vibrating body 21 extends near or outside the position of the wall portion 33 </ b> B of the yoke 33. In the illustrated example, the outer peripheral portion 21A of the vibrating body 21 is disposed in the vicinity of or on the outer side of the inner side surface of the wall portion 33B. Moreover, you may arrange | position in the position vicinity of the outer side surface of wall part 33B, or the outer side, without being limited to the example of illustration. 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 a position outside the magnetic gap 30G. For this reason, 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.

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

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

  The inner peripheral portion 23 </ b> A of the first bending portion 23 supports the vibrating body 21. Further, the inner peripheral portion 23 </ b> A of the first bending portion 23 is disposed at a position higher than the inner peripheral portion 24 </ b> A of the second bending 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 bending portion 24 and the height h2 from the second magnetic pole portion 32 to the inner peripheral portion 23A of the first bending portion 23 are set. In comparison, h1 <h2. In this manner, a relatively large gap can be provided between the second magnetic pole portion 32 and the inner peripheral portion 23A of the first bending 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 23 </ b> C of the first bending portion 23 is disposed in the vicinity of the outer peripheral portion 21 </ b> A of the vibrating body 21. The top 23C of the first bending 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 bending portion 23 is The first curved portion 23 is disposed at substantially the same height with respect to the top portion 23 </ b> C. By forming the first bending portion 23 having the top portion 23C in this way, the inner peripheral portion 24A of the second bending portion 24 is located on the vibrating body 21 side and away from the second magnetic pole portion 32. Can be provided.

  The first bending portion 21 has a length L1 along the radial direction. The second bending 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 portion 24C of the second curved portion 24, and the length L3 is the length from the top portion 24C to the outer peripheral portion 24B of the second curved portion 24. is there. By providing the first bending portion 23 between the second bending portion 24 and the vibrating body 21, the top 24C of the second bending portion 24 is separated from the second magnetic pole portion 32 by a length L1. Can be provided at different positions. For this reason, a relatively large gap can be provided between a part of the second bending portion 24 and the second magnetic pole portion 32 in the height direction, and the second bending portion 24 becomes the second magnetic pole portion. 32 can be prevented from interfering.

  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. Has been placed. As the voice coil 25 vibrates, the inner peripheral portion 22 </ b> A of the edge 22 vibrates up and down from the outer peripheral portion 22 </ b> B of the edge 22. Thus, the speaker device 1 can be thinned 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 to the sound radiation side.

  The second bending portion 24 has a top portion 24C provided between the inner peripheral portion 24A and the outer peripheral portion 24B. The top portion 24 </ b> C of the second bending portion 24 is disposed on the outer side with respect to the position of the second magnetic pole portion 32 and is provided at a higher position with respect to the second magnetic pole portion 32. With this arrangement, the top 24 </ b> C of the second bending portion 24 may approach the second magnetic pole portion 32 with the vibration of the voice coil 25, but a part of the second bending portion 24 is It can arrange | position so that it may not contact the 2nd magnetic pole part 32. FIG.

  A distance S1 between the second magnetic pole portion 32 and a part of the stationary portion 10 that supports 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 set lower than the height of the first magnetic pole portion 31 (there is a difference in height of Δh in FIG. 4). The distance (h3 + Δh) to the second magnetic pole part 32 is formed larger than the distance (h3) from the vibrating body 21 to the first magnetic pole part 31.

  The bending radius R 1 of the first bending portion 23 is smaller than the bending radius R 2 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 radius R1 of the first bending portion 23 is relatively large, the first bending portion 23 is likely to bend (is easily deformed) and may easily interfere with the second magnetic pole portion 32. Further, unnecessary resonance (including split resonance and reverse resonance) may occur. In addition, a rolling phenomenon may be induced with the occurrence of this unnecessary resonance. When the bending radius R1 of the first bending portion 23 is 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 that protrudes 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 includes the second curved portion 24E. The curved portion 24 is disposed between the outer peripheral portion 24B and the inner peripheral portion 24A 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 ensure the amplitude of the vibrating body 21 by the second bending portion 24 having a large bending diameter. Further, since the reinforcing portion 24E imparts appropriate rigidity to the second curved portion 24, the edge 22 can support the vibrating body 21 at a predetermined position. In addition, the rolling phenomenon (rolling) can be prevented from occurring in the voice coil 25. Further, when the vibrating body 21 vibrates, the edge 22 may be deformed in the circumferential direction, so that a corner portion of the edge may be wrinkled. In addition, a rolling phenomenon may occur in the voice coil 25 due to the generation of the wrinkles. The reinforcing portion 24E has a shape that expands and contracts its shape along the circumferential direction. Specifically, the reinforcing portion 24E includes a top portion, and the shape of the reinforcing portion 24E expands and contracts by bending or refracting at the top portion. It is possible to prevent wrinkles from occurring 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.

  In general, when the speaker device is thinned or miniaturized, it is conceivable that the diaphragm and the magnetic circuit are brought close to each other to make the speaker device thin, or the frame is brought close to the magnetic circuit to be miniaturized. At this time, since the concave edge is disposed in a state of being close to the yoke of the magnetic circuit, when the diaphragm vibrates, the edge may come into contact with the yoke. In addition, abnormal noise may occur due to such contact.

  Since the speaker device 1 has the above-described structure, the edge 22 is less likely to 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. Accordingly, even when the speaker device 1 is thinned by bringing the vibrating body 21 close to the magnetic circuit 30, it is possible to suppress contact between the edge 22 and the yoke 33 and generation of abnormal noise due to this contact. become.

  That is, the speaker device 1 suppresses the contact between the edge 22 and the yoke 33 and is outside the connecting position between the rigid vibrating body 21 and the voice coil 25 in order to reduce the thickness or size of the speaker device 1. And an outer peripheral portion 21 </ b> A of the vibrator 21 disposed in the vicinity of the second magnetic pole portion 32. In addition, the speaker device 1 includes a first bending portion 23 that is a convex bending portion, and a second bending portion 24 that is disposed outside the first bending portion 23 and is a concave bending portion. The edge 22 is provided. Since the speaker device 1 includes such a vibration unit 20, the speaker device 1 can be reduced in size and thickness, and the contact of the edge 22 with the yoke 33 and generation of abnormal noise due to the contact are suppressed. can do.

  Although the illustrated edge 22 has an inner peripheral portion 22A, the edge 22 may have only the 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 a member having elasticity and a member having rigidity 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, so that the elastic member is arranged on the acoustic radiation side with respect to the rigid member. The speaker device 1 can be thinned.

  Since the top 23C of the first bending portion 23 is provided in the vicinity of the outer peripheral portion 21A of the rigid vibrating body 21, a part of the first bending portion 23 vibrates even while the vibrating body 21 is vibrating. The height substantially the same as that of the body 21 can be maintained, and contact with the second magnetic pole portion 32 can be suppressed. Moreover, since the distance between the 1st bending part 23 and the 2nd bending part 24 can be made comparatively large, the amplitude of the vibrating body 21 can be made comparatively large.

  As the speaker device is downsized, there is a problem that the effective vibration area of the vibrating body is also reduced. By disposing the outer peripheral portion 21A of the vibrating body 21 outside the voice coil 25 and further extending to the vicinity of the top portion 23C of the first bending portion 23, a relatively large effective area of the vibrating body 21 can be obtained. . In addition, the top portion 23C is located away from the outer peripheral portion 21A of the vibrating body 21 while being substantially smaller than the vibrating body 21 while keeping the bending radius R1 of the first bending portion 23 relatively small (maintaining rigidity). By arranging them at the same height, a part of the first bending portion 23 can be a part of the vibrator 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 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, the contact between the two can be suppressed, and the amplitude of the vibrating body 21 can be relatively increased.

  By disposing the top portion 24 </ b> C of the second bending portion 24 outside the second magnetic pole portion 32, the distance between the first bending portion 23 and the second magnetic pole portion 32 can be made relatively large. Also by this, contact between the edge 22 and the second magnetic pole portion 32 can be suppressed. Moreover, since the distance between the 1st curved part 23 and the 2nd magnetic pole part 32 can be made comparatively large, the contact with the 1st curved part 23 and the 2nd magnetic pole part 32 can be suppressed.

  The vibrating body 21 includes a rigid vibration member 21B having rigidity, and the rigid vibration member 21B includes carbon as a constituent element. As shown in FIG. 6, the rigid vibration member 21 </ b> B includes a foam layer 21 </ b> C having a foam structure and a covering layer 21 </ b> D covering the foam layer 21 </ b> C.

The edge 22 is made of a resin member. In addition, the vibrating body 21 having the rigid vibration member 21B has substantially the same shape as the rigid vibration portion 21B in the illustrated example, is made of polyetherimide, has a density of about 1.27 g / cm ³ , and a Young's modulus. Has a small density and a large rigidity with respect to the comparative vibrator having a pressure of about 4 MPa. Further, the thickness of the vibrating body 21 is smaller than the total height of the edge 22.

The magnitude obtained by dividing the Young's modulus in the vibrator 21 by the density is larger than the magnitude obtained by dividing the Young's modulus in the above-described comparative vibrator by the density. The rigid vibration member 21B substantially composed of only carbon has a density of about 0.5 g / cm ³ , a Young's modulus of about 7 GPa, a bending strength of about 25 MPa, and a thickness of about 0.3 mm. It is.

  By configuring the vibrating body 21 with a member whose main component is carbon, the vibrating body 21 can be light and thin. Moreover, it is light and has high rigidity with respect to the above-described comparative vibrating body made of the resin member constituting the edge 22. In the illustrated example, the rigid vibration member 21 </ b> B includes a foam layer 21 </ b> C having a foam structure, and two coating layers 21 </ b> D that cover the front and back surfaces of the foam layer 21 </ b> C. The coating layer 21D substantially forms a continuous surface. For this reason, by providing the covering layer 21D on the surface of the foam layer 21C, the sound wave propagating from the back side (the magnetic circuit 30 side) of the vibrating body 21 passes through the vibrating body 21 and is emitted in the acoustic radiation direction. Can be suppressed, and the acoustic characteristics can be improved.

[Magnetic circuit structure]
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. The yoke 33 includes a bottom surface portion 33 </ b> A that is magnetically coupled to the magnet 35, and a bottom surface portion. And a wall 33B standing from 33A. A magnetic gap 30 </ b> G is disposed between the plate 34 as the first magnetic pole part 31 and the wall part 33 </ b> B of the yoke 33 as the second magnetic pole part 32. In the illustrated example, the bottom surface portion 33A of the yoke 33 has a flat plate shape.

  Further, as shown in FIG. 6 which is a 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 magnetically coupled to the magnet 35, an inner magnet 35A is disposed inside the voice coil 25, an outer magnet 35B is disposed outside the voice coil 25, and the plate 34 is disposed on the inner side. 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 or the 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 35 </ b> B is the second magnetic pole portion 32.

  FIG. 7 shows the entire configuration of the magnetic circuit (FIG. 7A is a plan view and FIG. 7B is a perspective view). As shown in FIG. 7, a plurality (a pair) of outer magnets (the other magnet) 35 </ b> B are disposed at positions facing each other across the inner magnet (one magnet) 35 </ b> A. The yoke 33 includes a plurality of opposing wall portions 33B. An outer magnet (the other magnet) 35B is disposed between the wall portions 33B of the yoke 33 in the circumferential direction, and each outer magnet 35B is magnetically coupled to the bottom surface portion 33A of the yoke 33. Yes.

  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 may be formed obliquely with respect to the thickness direction. Here, of the inner magnet 35A or the outer magnet 35B, one of the magnets 35A (35B) has the orientation of the magnet 35A (35B) oriented along the thickness direction of the magnet 35A (35B), and the other magnet 35B. In (35A), the orientation of the magnet 35B (35A) is inclined with respect to the thickness direction of the magnet 35B (35A). In the illustrated example, the outer magnet 35B is oriented obliquely with respect to the thickness direction. However, the orientation of the outer magnet 35B is set to the thickness direction, and the orientation of the inner magnet 35A is made oblique to the thickness direction. May be. When the orientation of the inner magnet 35 </ b> A is oblique, for example, a plurality of inner magnets 35 </ b> A are arranged in a ring shape on the yoke 33. Further, the orientation of the inner magnet 35A and the outer magnet 35B may be inclined with respect to the thickness direction. In this case, a plurality of rod-like inner magnets 35 </ b> A and a rod-like plurality of outer magnets 35 </ b> B are arranged on the yoke 33 in a ring shape. 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 disposed on the inner magnet 35A, and the outer plate is disposed on the outer magnet 35B. In any case, the orientation directions of the inner magnet 35A and the outer magnet 35B are substantially constant in the magnet thickness direction. That is, the orientation direction does not substantially change in the magnet thickness direction. Further, in the illustrated example, the orientation direction of the outer magnet 35B is an obliquely lower right direction, but is not limited thereto. For example, when the orientation of the inner magnet 35A is downward along the thickness direction, the orientation direction of the outer magnet 35B is an obliquely upper left direction. As described above, 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 where the magnetic flux passes. That is, the magnetic gap 30G is a position where the magnetic flux passes, and is on a part of the yoke 33 that is different from the positions of the outer magnet (the other magnet) 35B as the magnetic pole part and the outer magnet (the other magnet) 35B. It is formed between the magnetic pole part (plate 34) provided in this.

  In the illustrated example, the magnetic circuit 30 includes the inner magnet 35A, the outer magnet 35B, the yoke 33, and the plate 34. However, the wall 33B of the yoke 33 may be disposed instead of the outer magnet 35B. I do not care.

  When driving the speaker device 1, an audio signal is input to the voice coil 25. As the audio signal is input, Joule heat is generated in the voice coil 25. This Joule heat may increase the temperature in the magnetic circuit 30. Generally, when the temperature in the magnetic circuit increases, the problem of high temperature demagnetization may occur.

  Further, when Joule heat is not sufficiently dissipated as radiant heat from the voice coil 25, the temperature of the voice coil 25 and the lead wire 26 may become relatively high. Generally, when the temperature of the voice coil or the lead wire becomes relatively high, there is a problem that they are disconnected.

  Furthermore, the voice coil 25 and the lead wire 26 may be in a high temperature state or a normal temperature state by repeatedly driving the speaker device 1. In an environment where the speaker device 1 is used, the voice coil 25 or the lead wire 26 may be in a low temperature state. Such a cycle of a high temperature state and a normal temperature state or a high temperature state and a low temperature state is repeated, so that a load is generally applied to the voice coil or the lead wire, and there is a concern that the wire breaks.

  As an embodiment of the present invention, the heat of the voice coil 25 or the lead wire 26 can be dissipated by propagating it to the structural member of the magnetic circuit 30 or the frame 11 as the stationary part 10, In some cases, it can contribute to the solution of the disconnection problem. Examples of the heat propagation path include a propagation path in the order of the voice coil 25 (including the lead wire 26), the plate 34, the magnets 35A and 35B, the yoke 33, and the frame 11. Furthermore, a propagation path that propagates from the wall of the yoke 33 to the frame 11 is also conceivable. The heat propagation path is not limited to this, and the heat is transmitted to the constituent member of the magnetic circuit 30 or the constituent member of the vibration unit 20, the other constituent member, or the outside disposed in the vicinity of the voice coil 25 or the lead wire 26. Propagating paths are also conceivable.

  Further, since the magnet has a relatively large heat capacity, it can contribute to efficiently transmitting the heat of the voice coil 25 and the lead wire 26. In particular, the magnetic circuit 30 that is a combined type in which the magnetic circuit 30 uses both the inner magnetic type and the outer magnetic type includes an outer magnet with respect to the inner magnetic type magnetic circuit. For this reason, the combined 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 there may be cases where more heat from the voice coil 25 or the lead wire 26 can be released.

  Further, when the magnetic circuit 30 is an outer magnet type or a combination type, the outer diameter of the yoke 33 may be larger than that of the inner magnet type magnetic circuit. At this time, the heat capacity of the entire magnetic circuit 30 may become relatively large, which may contribute greatly to the release of heat from the voice coil 25 or the lead wire 26.

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

  When the outer magnets (other magnets) 35B and 35B having substantially the same outer shape are used, there is a problem that it is not possible to identify which direction the magnet is oriented. Therefore, an orientation discriminating unit 36 for discriminating the orientation direction is provided in order to identify the orientation direction of the magnet and arrange the other magnet at an appropriate position. The orientation discriminating portion 36 can be formed by the notch 35B1 provided in the magnet 35 as described above, but is not limited thereto, and can also be formed by giving an indication such as an arrow on 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). And the inner magnet 35A) are oriented obliquely 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 oblique, it is possible to suppress the occurrence of magnetic leakage (the magnetic flux goes to 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 that is far from the yoke 33 and relatively high. 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, if a magnet having an orientation in the thickness direction is also used at the same time, it becomes difficult to distinguish 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 whose orientation is oblique is used as the second magnet (outer magnet 35B), a notch 35B1 is provided on the end surface of the second magnet (outer magnet 35B), and a marker for judging the type of the magnet It is said.

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

  The outer peripheral cylindrical portion 11A of the frame 11 includes one or a plurality of concave portions 11A2 at the lower end portion 11A1. Further, the yoke 33 includes a protruding portion 33C that protrudes in the direction from the bottom surface portion 33A toward the frame 11. A part of the yoke 33 is disposed in the opening 11B1 of the frame 11, and the protrusion 33C of the yoke 33 is disposed in the recess 11A2 of the frame 11, so that the yoke 33 and the frame 11 are attached. The lower surface 33E of the yoke 33 is disposed 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, there is provided a joining member reservoir 51 for accumulating the joining member 50 that joins the frame 11 and the outer magnet 35B. The joining member reservoir 51 includes a predetermined gap 52. The gap 52 includes 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. Is done. The frame 11 has an inner side surface 11D as a side surface facing the outer magnet. The protruding portion 11E constituting the first gap protrudes 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 disposed 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 gap 52 provided between the frame 11 and the outer magnet 35B with the outside.

  In an electronic device or the like on which the speaker device 1 is mounted, the space inside the device is limited. On the back side of the speaker device 1, an external terminal of an electronic device that is in electrical contact with the terminal portion 12 of the speaker device 1 is provided. Here, as a constituent member constituting the magnetic circuit 30, for example, a case is assumed in which the yoke 33 protrudes toward the electronic device side with respect to the frame 11. 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, resulting in a problem that the electronic device may malfunction. In particular, since the speaker device for a mobile phone is relatively small, if the tolerance of the shape of the yoke 33 is large, a part of the yoke 33 may protrude from the frame 11 in some cases. Therefore, by providing the frame 11 with the recess 11A2 and disposing the protrusion 33C of the yoke 33 in the recess 11A2, it is possible to prevent a part of the yoke 33 from protruding. Thereby, the speaker device 1 can be arranged in a predetermined space, and the electronic device can be thinned while avoiding contact between the yoke 33 and the external terminal.

  More specifically, the concave portion 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 thinned, it is possible to prevent a part of the yoke 33 from protruding due to a tolerance of the shape of the yoke 33 or the like. In addition, it is possible to suppress 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 protrude with respect to the frame 11, electrical contact with the external terminal portion can be suppressed.

  In the radial direction of the magnetic circuit 30 (direction intersecting with 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 set the magnetic gap 30G to a specified width. . Also, if the outer magnet 35B has a width larger than the desired width (has a tolerance), the outer magnet 35B may not be installed in the frame 11 if the width of the magnetic gap 30G is given priority. In order to solve this problem, a predetermined gap 52 is provided between the frame 11 and the outer magnet 35B. A part of the outer magnet 35 </ b> B whose width is substantially the same as the tolerance is disposed in the gap 52. Thereby, the magnetic gap 30G can be set to a specified width. Further, the outer magnet 35 </ b> B can be disposed in the frame 11.

  In order to join the frame 11 and the outer magnet 35 </ b> B, 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 this joining member 50 is filled, the protrusion 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. An injection port (dispenser) of an injector for injecting 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 contacts the bottom surface portion 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). The gap 52 is filled with the joining member 50, 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) in the frame 11 corresponding to the size (tolerance) of the magnet. It is possible to attach a magnetic circuit 30 including

  For example, the dimensions of the speaker device 1 mounted on a mobile phone are defined in advance. Further, the speaker device 1 needs to make effective use of the specified dimensions in order to satisfy the requirements such as keeping the specified dimensions and relatively increasing the electromagnetic force of the voice coil 25. Further, the position of each component in the speaker device 1 is defined with relatively high accuracy so as to have a prescribed dimension. Therefore, when there are multiple components and there is a tolerance of the components, if the component members are misaligned, the components cannot be placed at the specified positions, or the speaker device exceeds the specified dimensions. There is. Therefore, in order to reduce the deviation due to the tolerances of the constituent members, a concave portion 11A2 is provided in the outer peripheral cylindrical 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 disposed in the concave portion 11A2. At this time, a part of the yoke 33 corresponding to the tolerance is disposed in the recess 11 </ b> A <b> 2 of the frame 11. With such an arrangement, it is possible to reduce the deviation due to the tolerance of the constituent members, and to reduce the thickness of the speaker device 1. Therefore, it becomes possible to arrange other constituent members at a prescribed position and to set the speaker device 1 to a prescribed dimension.

  FIGS. 12A and 12B are explanatory views showing another example of the mounting structure of the magnetic circuit. In the example of FIG. 5A, 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 therebetween. 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. 5B, the magnetic circuit 30 is attached to the stationary portion 10 with the upper surface of the yoke 33 abutting against a fixed surface formed on the bottom surface portion 11B of the frame 11. 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. Thus, the outer plate 34B can be provided with a relatively large gap between the outer plate 34B and the edge 22 disposed above the outer plate 34B. In FIG. 12A, the inner magnet 35A and the outer magnet 35B may be oriented along the thickness direction. In this case, the magnetic gap 30G is substantially formed by the inner plate 34A and the outer plate 34B. In FIG. 12B, the orientation of the outer magnet 35B may be an oblique direction with respect to the thickness direction, and the orientation of the inner magnet 35A may be a direction along the thickness direction. In this case, the magnetic gap 30G is substantially formed by the inner plate 34 and the outer magnet 35B.

[Leader line placement and disconnection suppression]
FIG. 4 shows a cross-sectional view of the voice coil 25 and the lead line 26. A lead wire 26 led out from the lower end 25A of the voice coil 25 and a plurality of terminal portions 12 that electrically connect the voice coil 25 to the outside through the lead wire 26 are provided. The terminal portion 12 is provided on the frame 11. The yoke 33 includes a plurality of wall portions 33B provided upright from the bottom surface portion 33A and a notch portion 33F provided between adjacent wall portions 33B. The lead wire 26 of the voice coil 25 passes through the notch 33F, passes through a lead-out passage 38 provided between the wall 33B of the yoke 33 and the inner side surface 11D of the frame 11 facing the wall 33B. Connected to the terminal portion 12.

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

  That is, the second magnet (outer magnet 35 </ b> B) is disposed on the yoke 33 outside the voice coil 25. A lead wire 26 is drawn out from the lower end portion 25 </ b> A of the voice coil 25. The lead line 26 is routed toward a plurality of terminal portions 12 arranged on one side of two regions separated by a long axis 25L that passes through the central position of the voice coil 25. The lead-out position of the lead-out line 26 is substantially drawn out from the vicinity of the corner of the voice coil 25, specifically, from a plurality of curved portions and straight portions of the voice coil 25. A retracting portion 40 for retracting the lead wire 26 is provided on the bottom surface portion 33 </ b> B of the yoke 33 corresponding to the lead position of the lead wire 26. The retracting portion 40 has a concave cross section. The yoke 33 includes a plurality of wall portions 33B, and a notch portion 33F is provided in the yoke 33 between adjacent wall portions 33B. Between the cutout 33F, the wall 33B of the yoke 33, and the inner side surface 11D of the frame 11, a lead-out passage 38 for drawing the lead-out line 26 is formed. A part on the end side of the lead wire 26 is electrically connected to the terminal portion 12 and inputs an audio signal from the outside to the voice coil.

  The lead wire 26 of the voice coil 25 has a lead portion 26A that is drawn across the end surface of the voice coil 25 opposite to the vibrating body 21 (see FIG. 4). The magnetic circuit 30 has a bottom surface portion 33A facing the end surface of the voice coil 25 disposed in the magnetic gap 30G, and the bottom surface portion 33A is in contact with the bottom surface portion 33A of the lower end surface 25A of the voice coil 25 or A retracting portion 40 is formed in which the drawer portion 26A retracts when approaching. In other words, the yoke 33 (stationary portion 10) facing the lower end portion 25A of the voice coil 25 is provided with a retracting portion 40 for retracting the lead portion 26A of the lead wire 26 drawn from the voice coil 25 (FIGS. 4 and 4). 9). The retracting portion 40 where the lead portion 26A is retracted is provided to prevent the voice coil 25 and the yoke 33 from coming into contact with each other due to an external impact, and the lead wire 26 is disconnected. The retracting portion 40 has a concave shape in cross section.

[Terminal structure]
13-15 is explanatory drawing which showed the structure of the terminal part. FIG. 15 is a perspective view of a part of the outer peripheral cylindrical 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 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 lead wire 26 of the voice coil 25. And the second contact portion 12 </ b> B that is electrically connected to the frame 11. The frame 11 includes a fixing portion 14 that fixes the terminal portion 12.

  The outer peripheral cylindrical portion 11A of the frame 11 includes a locked portion 11A3 to which the end 12C of the first contact portion 12A is locked, and the locked portion 11A3 has a first contact portion 12A below the frame 11. It is restricted to move 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 is locked 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 cylindrical portion 11A of the frame 11 includes a storage portion 11A4 that stores the terminal portion 12, and the storage portion 11A4 is a recess formed on the outer side surface 11A5 of the outer peripheral cylindrical portion 11A of the frame 11. The outer peripheral cylinder portion 11 </ b> A of the frame 11 includes a movement space 11 </ b> A <b> 6 in which the first contact portion 12 </ b> A moves along the vibration direction of the voice coil 25.

  The locked portion 11A3 provided in the outer peripheral cylindrical portion 11A of the frame 11 can restrict the movement of the first contact portion 12A below the frame 11 (on the mobile phone casing side). On the other hand, when the first contact portion 12A moves, there is a problem that the elastic support portion 13 repeats the bending motion, and the elastic force is reduced. In particular, when the moving width of the first contact portion 12A is large, the elastic force may be further reduced. Therefore, the elastic force of the elastic support part 13 can be maintained over a long period of time by providing the locked part 11A3 and limiting the movement width of the first contact part 12A.

  By disposing the terminal portion 12 in the outer peripheral cylindrical portion 11A of the frame 11, the speaker device 1 can be set to a predetermined size and can be reduced in size. The outer peripheral cylindrical portion 11 </ b> A of the frame 11 includes a moving space (opening) for the first contact portion 12 </ b> A to move along the vibration direction of the voice coil 25. For this reason, 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 deviated, and the predetermined portion between the external terminal portion and the first contact portion 12A is separated by the locked portion 11A3. Can maintain the distance.

  For example, the terminal unit 12 of the speaker device 1 may be electrically connected to a terminal unit (external terminal unit) included in the 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 is in contact with an external terminal portion. The elastic support portion 13 elastically supports the first contact portion 12 </ b> A 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 part 14 fixes the terminal part 12 to the frame 11. The end portion of the first contact portion 12 </ b> A includes a locking portion 12 </ b> D that is locked to the frame 11. This latching | locking part 12D controls that the 1st contact part 12A moves below from the flame | frame 11 (the housing | casing side of a mobile telephone). Moreover, the latching | locking part 12D maintains the elasticity of the curved elastic support part 13 over a long period of time. The frame 11 includes a storage portion for storing the terminal portion 12 on the outer side surface 11A5 of the outer peripheral cylindrical portion 11A so that the speaker device 1 can be accommodated in a predetermined size. The frame 11 includes a movement space 11A6 (opening) for the first contact portion 12A to move along the thickness direction of the speaker device 1. The moving space 11A6 includes an opening 11A7 inside the outer peripheral cylindrical portion 11A of the frame 11. The opening portion 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 the opening portion 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 the major axis 22L1 and the minor axis 22L2, that is, a rectangular outer shape that is long in one direction. The edge 22 has the first curved portion 23 and the second curved portion 24 as described above, and thus has a convex cross-sectional shape on the side opposite to the acoustic radiation direction. The edge 22 is provided with one or a plurality of protrusions 24E at its corners. The protrusion 24E has a convex cross section on the acoustic radiation side or a convex sectional shape on the opposite side to the acoustic radiation side. The protrusion 24E extends along the radial direction of the edge 22. The protrusion 24 </ b> E has an outer peripheral portion located inside the outer peripheral portion 22 </ b> B (see FIG. 5) of the edge 22, and an inner peripheral portion arranged inside the inner peripheral portion 22 </ b> A (see FIG. 5) of the edge 22. The inner peripheral portion 22 </ b> A 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 includes a vibrating body 21 and an edge 22 that supports the vibrating body 21 on a frame. The external shape of the speaker device 1 may be a circle, an ellipse, a track shape or the like regardless of a rectangle.

  The protection unit 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 with its inner peripheral portion 22A. A magnetic circuit 30 supported by the frame 11 is disposed on the back side of the vibrating body 21. The voice coil 25 is supported by the vibrating body 21 via the inner peripheral portion 22 </ b> A of the edge 22. The vibrating body 21 is made of a material whose main component is carbon and has electrical conductivity. The voice coil 25 needs to be attached to the vibrating body 21 via the 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 35 </ b> A and 35 </ b> B are arranged inside and outside the voice coil 25. A first space is provided on the front side (acoustic radiation 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 21 </ b> A of the vibrating body 21 is disposed in the vicinity of the position of the wall portion 33 </ b> B of the yoke 33 in a direction intersecting the vibration direction of the voice coil 25. Further, the inner peripheral portion 22 </ b> A of the edge 22 is also disposed in the vicinity of the position of the wall portion 33 </ b> B of the yoke 33. At this time, since the vibrating body 21 has bending rigidity, when the vibrating body 21 vibrates, the edge 22 can be prevented from coming into contact with the wall portion 33B of the yoke 33, and the inside of the first bending portion 23 included in the edge 22 can be prevented. The position of the peripheral portion 23A or the inner peripheral portion 24A of the second bending portion 24 can be disposed in the vicinity of 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 a mounting member provided in an electronic device 100 such as a mobile phone or a portable information terminal 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 in an 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, ceiling, rear tray, or dashboard as a member to be attached. In this case, the thickness of the member to be attached such as the door panel can be made relatively small, and the boarding space can be made relatively large.

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

  The electronic apparatus 101 includes a display unit 101 </ b> A and an input operation unit 101 </ b> B, and the input operation unit 101 </ b> B is a housing that houses 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 such that a vibrating body is disposed on the operation surface of the input operation unit 101B. Further, the present invention is not limited to the illustrated example, and the display unit 101 </ b> A may be used as a housing, and one or a plurality of speaker devices 1 may be arranged on the side portion thereof.

  As the electronic device 102, a pair (a plurality) of housings 102A and 102A for housing the speaker device 1 are provided, and an arch-shaped connecting portion 102B that connects the housings 102A and 102A electrically connects the plurality of speaker devices 1. This is a wiring accommodating portion that accommodates wiring to be connected to the cable.

  20 to 22 are explanatory diagrams illustrating examples of mounting the speaker device according to the embodiment of the present invention on an electronic device. FIG. 20 is an overall configuration diagram illustrating an example of mounting on the electronic device 101 described above. In the example shown in the figure, a plurality of housings 110 for housing the speaker device 1 with the vibrating body 21 exposed are provided. Between the housings 110 and 110, a wiring housing portion 120 for housing wirings for electrically connecting the plurality of speaker devices 1 is provided. The wiring accommodating portion 120 is provided with a terminal portion 121 for electrical connection with an electronic device.

  21A is an enlarged perspective view of the A1 portion in FIG. 20, and FIG. 21B is an enlarged cross-sectional view of the A2 portion in FIG. In FIG. 21A, the speaker device 1 including the vibrating body 21 is accommodated in a housing 110, and the housing 110 has a frame (first stationary portion) that supports the vibrating portion (vibrating body 21, edge 22). ) 111 and a cabinet 112 (second stationary portion) that constitutes an air chamber between the casing 110 and the vibrating body 21. The frame 111 includes an outer peripheral cylindrical portion that surrounds the vibrating body 21. Further, an attachment portion 111A for attaching the frame 111 to the casing 110 of the electronic device is provided on the outer peripheral side surface of the outer peripheral cylindrical portion of the frame 111. The cabinet 112 is disposed on the back side of the frame 111 (below the magnetic circuit 30).

  In FIG. 21B, the speaker device 1 including the vibrating body 21 is accommodated in a housing 110, and the housing 110 has a frame (first stationary portion) that supports the vibrating portion (vibrating body 21, edge 22). 111). In this example, the housing 110 includes a cabinet 112 arranged on the back side of the frame 111. A ventilation path 111 </ b> S 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 cylindrical portion 113 of the frame 111 and the outer peripheral side portion of the yoke 33. This gap serves as a ventilation path 111 </ b> S 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 air passage 111S. The air chamber 112 </ b> S is provided near the outside of the edge 22 and on the back side of the yoke 33 of the magnetic circuit 30.

  FIGS. 22A and 22B are explanatory views showing the casing A1 in FIG. 20, in which 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 aforementioned notches 33F are formed at the four corners of the yoke. The notch 33F corresponds to the air passage 111S. An air chamber 112 </ b> S is provided on the side of the cabinet 112 attached to the back side of the frame 111. Further, the space in the frame 111 communicates with the air chamber 112S through the air passage 111S of the frame 111.

  The housing 110 includes an inclined surface portion 114 on the outer side of the outer peripheral cylindrical portion 113. By providing this inclined surface part 114, the space between the housing | casing 110 and the speaker apparatus 1 can be made comparatively large, and an acoustic characteristic can be improved. An 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 emitted from the speaker device 1 to the outside. This sound emitting part 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. For this reason, the electronic device 101 includes 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. In addition, an acoustic type speaker device can be provided.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. The embodiments described in the above drawings can be combined with each other as long as there is no particular contradiction or problem in the purpose, configuration, or the like. Moreover, the description content of each figure can become independent embodiment, respectively, and embodiment of this invention is not limited to one embodiment which combined each figure.

  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 domestic transition date to the United States on January 26, 2010, US patent application US12 / 675079 with domestic transition date to the United States on February 24, 2010, domestic transition date to Europe All the contents described in the European patent application EP07807159.4, on February 23, 2010, are incorporated into the present 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 line, 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: Joining member reservoir 52: Gap, 100, 101, 102: Electronic equipment,
110: housing,
111: Frame (first stationary part), 112: Cabinet (second stationary part),
111S: Air passage, 112S: Air chamber, 120: Housing for wiring,
200: Automobile

Claims (3)

A housing including an air chamber and a mounting portion for mounting to an electronic device, a vibrating portion, and a magnetic circuit having a yoke ;
The casing is provided with an outer peripheral cylinder portion of a frame that surrounds the magnetic circuit and to which the vibrating portion is attached.
On the side part side of the housing with respect to the outer peripheral cylindrical part of the frame, there are the attachment part, the air chamber, and an inclined surface part ,
A notch provided between adjacent wall portions of the yoke and a gap on the inner side surface of the outer peripheral cylindrical portion of the frame facing the wall portion are a space between the vibrating portion and the magnetic circuit. A speaker device attached to an electronic apparatus, wherein an air passage connecting the air chamber is formed.   The speaker device to be attached to an electronic device according to claim 1, wherein one surface of the housing is attached to a back surface of the magnetic circuit. 3. The speaker device attached to the electronic apparatus according to claim 1, wherein a side portion of the housing is on the attachment portion side with respect to an outer peripheral cylindrical portion of the frame .

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