JP4901961B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device.

A speaker device that transmits a driving force of a voice coil from a voice coil bobbin to a diaphragm via a connecting member (also referred to as a driving member) is known (for example, see Patent Document 1).
The speaker device is disposed so as to cover the voice coil bobbin, the cone-shaped first diaphragm, the cylindrical coupling member that couples the first diaphragm and the voice coil bobbin, and the voice coil bobbin and the coupling member. A predetermined portion of the first diaphragm and a convex second diaphragm attached to the connecting member; In the speaker device, the outer peripheral portion of the substantially cylindrical connecting member is fixed to the frame via the damper, and the convex second diaphragm is provided at the center of the cone-shaped first diaphragm. Yes.

Japanese Patent Laying-Open No. 2005-159506 (FIG. 2)

  As described above, the speaker device described in Patent Document 1 includes a diaphragm member having a cone-shaped first diaphragm and a convex second diaphragm, and the acoustic radiation side surface is non-flat. Therefore, the plane wave (sound wave) having the same phase in the sound radiation direction cannot be radiated, and the acoustic characteristics may deteriorate due to interference between the radiated sound waves.

  In the speaker device having the above configuration, it is difficult to uniformly transmit the driving force of the voice coil to the first diaphragm and the second diaphragm via the connecting member, and each diaphragm is driven uniformly. In some cases, the acoustic characteristics are relatively low.

  This invention makes it an example of a subject to cope with such a problem. That is, the diaphragm member radiates sound waves having the same phase in a relatively wide range, the diaphragm member includes a plurality of diaphragms, and the driving member uniformly transmits the driving force to each diaphragm, relatively high sound quality It is an object of the present invention to provide a reproduced sound.

In order to achieve such an object, the present invention includes at least a configuration according to the following independent claims.
The speaker device according to the present invention includes a magnetic circuit in which a voice coil wound around a voice coil bobbin is disposed in a magnetic gap, a flat plate-shaped diaphragm member whose outer peripheral portion is supported by a frame so as to be able to vibrate, and the diaphragm It is arranged on the opposite side to the acoustic radiation direction of the member, the inner peripheral part is joined to the voice coil bobbin, the outer peripheral part is supported by the frame so as to be able to vibrate, and the acoustic radial direction extends from the inner peripheral part to the outer peripheral part. A drive member that extends in a cone shape toward the direction and is folded back in the direction opposite to the acoustic radiation direction at the folded portion, and transmits the driving force of the voice coil to the diaphragm member. The diaphragm member includes a first diaphragm formed in a flat plate shape, an inner peripheral portion formed with an inner diameter smaller than an outer diameter of the first diaphragm, and a back of the outer peripheral portion of the first diaphragm. A ring-shaped second diaphragm having a first diaphragm outer peripheral support section that supports the side, and the drive member is disposed on the folded portion located radially inward from the inner peripheral section of the second diaphragm. A first diaphragm supporting portion that supports the back side of the first diaphragm, and a second diaphragm supporting portion that is formed between the folded portion and the outer peripheral portion and supports the second diaphragm. It is characterized by that.

1 is a front view of a speaker device 1 according to a first embodiment of the present invention. It is sectional drawing along the AA of the speaker apparatus 1 shown in FIG. It is sectional drawing along the BB line of the speaker apparatus 1 shown in FIG. FIG. 4 is an exploded sectional view of the speaker device 1 shown in FIG. 3. It is a cross-sectional perspective view along the BB line of the speaker apparatus 1 shown in FIG. (A) is the perspective view which expanded the 1st diaphragm, 2nd diaphragm, and drive member vicinity of the speaker apparatus 1 shown in FIG. 5, (B) is the 1st diaphragm shown to (A), and 1st diaphragm. It is sectional drawing which expanded the junction part vicinity of 2 diaphragms. 2A and 2B are diagrams for explaining a first diaphragm 31 of the speaker device 1 illustrated in FIG. 1, in which FIG. 1A is a plan view of the surface side of the first diaphragm 31, and FIG. It is a top view of the back side. 2A and 2B are views for explaining a second diaphragm 32 of the speaker device 1 shown in FIG. 1, in which FIG. 1A is a plan view of the surface side of the second diaphragm 32, and FIG. 2B is a second diaphragm 32. It is a top view of the back side. FIG. 9 is an enlarged plan view of the vicinity of a groove portion of a second diaphragm 32 shown in FIG. FIG. 3 is a plan view showing a surface side (a diaphragm member side) of a driving member of the speaker device shown in FIG. 2. It is a perspective view of the surface side (diaphragm member side) of the drive member shown in FIG. It is the perspective view which expanded the hole vicinity formed in the drive member shown in FIG. It is sectional drawing for demonstrating the operation | movement at the time of the assembly of the voice coil bobbin and ring-shaped reinforcement member shown in FIG. It is sectional drawing for demonstrating the state which the voice coil bobbin shown in FIG. 13 and the reinforcement member fitted. (A) is sectional drawing for demonstrating the operation | movement at the time of the assembly of the drive member shown in FIG. 2, a ring-shaped reinforcement member, and a voice coil bobbin, (B) is the inner peripheral part of a drive member fitting to a voice coil bobbin. It is sectional drawing for demonstrating the state combined. It is sectional drawing of 1 A of speaker apparatuses which concern on 2nd Embodiment of this invention.

  A speaker device according to an embodiment of the present invention includes a magnetic circuit in which a voice coil wound around a voice coil bobbin is disposed in a magnetic gap, and a flat plate-shaped diaphragm member whose outer peripheral portion is supported by a frame so as to freely vibrate. The diaphragm member is disposed on the opposite side to the acoustic radiation direction, the inner peripheral part is joined to the voice coil bobbin, the outer peripheral part is supported by the frame so as to be freely vibrated, and extends from the inner peripheral part to the outer peripheral part. Extending in a cone shape toward the acoustic radiation direction and formed in a shape folded back in the opposite direction to the acoustic radiation direction at the folded portion, and transmits the driving force of the voice coil to the diaphragm member A first vibration plate formed in a flat plate shape, and an inner peripheral portion having an inner diameter smaller than an outer diameter of the first vibration plate, and the first vibration. A ring-shaped second diaphragm provided with a first diaphragm outer peripheral part supporting part for supporting a rear surface side of the outer peripheral part, and the drive member is located radially inward from the inner peripheral part of the second diaphragm. A first diaphragm support part that supports the back side of the first diaphragm at the folded part, and a second diaphragm support that is formed between the folded part and the outer peripheral part and supports the second diaphragm. And a section.

In the speaker device having the above-described configuration, the diaphragm member formed in a flat plate shape includes the first diaphragm having the above-described configuration and the second diaphragm supporting the first diaphragm, and the second diaphragm is an outer periphery of the first diaphragm. Since the driving member includes the first diaphragm supporting part and the second diaphragm supporting part, the driving member uniformly transmits the driving force by the voice coil to the first diaphragm and the second diaphragm. can do.
Further, the speaker device having the above-described configuration can radiate sound waves having the same phase in a relatively wide range because the plate-shaped diaphragm member having a flat surface on the acoustic radiation direction side vibrates. In addition, the speaker device having the above configuration can provide a relatively high quality reproduced sound.

  Hereinafter, a speaker device according to an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a front view of a speaker device 1 according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA of the speaker device 1 shown in FIG. FIG. 3 is a cross-sectional view taken along line BB of the speaker device 1 shown in FIG. FIG. 4 is an exploded cross-sectional view of the speaker device 1 shown in FIG. FIG. 5 is a cross-sectional perspective view of the speaker device 1 shown in FIG. 6A is an enlarged perspective view of the vicinity of the first diaphragm, the second diaphragm, and the driving member of the speaker device 1 shown in FIG. FIG. 6B is an enlarged cross-sectional view of the vicinity of the joint between the first diaphragm and the second diaphragm shown in FIG. 6A and 6B, the left-side cross-sectional portions of the first and second diaphragms are illustrated, and the right-side cross-sectional portions are omitted.

1 to 6, the speaker device 1 according to the first embodiment of the present invention includes a magnetic circuit 2, a vibrating body 3, a voice coil bobbin 37, a voice coil 38, a ring-shaped reinforcing member (reinforcing member) 39, and a frame. (Speaker frame) 4, terminal portion 5, protection member 6, and wiring (kinshi wire) 82. The vibrating body 3 includes a diaphragm member 30, a drive member (drive cone) 33, a first edge 34, and a second edge 35. The diaphragm member 30 includes a first diaphragm (center cap) 31 and a second diaphragm 32. The lead wire 81 and the wiring 82 drawn from the voice coil 38 are collectively referred to as a conductive wire 8.
The magnetic circuit 2 corresponds to an embodiment of the magnetic circuit according to the present invention, and the diaphragm member 30 corresponds to an embodiment of the diaphragm member according to the present invention. The first diaphragm 31 corresponds to an embodiment of the first diaphragm according to the present invention, and the second diaphragm 32 corresponds to an embodiment of the second diaphragm according to the present invention. The drive member 33 corresponds to an embodiment of the drive member according to the present invention.

The speaker device 1 according to the present embodiment is a so-called double cone type speaker device in which the vibrating body 3 includes a diaphragm member 30 and a driving member 33.
The diaphragm member 30 is formed in a flat plate shape, and an outer peripheral portion thereof is supported by the upper flat portion 41 of the frame 4 through the first edge 34 so as to freely vibrate. Further, the first diaphragm 31 and the second diaphragm 32 are formed with flat surfaces so that the surfaces on the acoustic radiation side are located on substantially the same plane.
The first diaphragm 31 is formed in a flat plate shape, and the outer peripheral portion 31D is supported by the second diaphragm 32. The first diaphragm 31 is supported by the driving member 33 at the joint portion 312 positioned radially inward from the outer peripheral portion 31D. Yes. The second diaphragm 32 is formed in a ring shape, and an inner peripheral portion 32 </ b> A is formed to have an inner diameter smaller than the outer diameter 31 </ b> D of the first diaphragm 31 and supports the outer peripheral portion rear surface side of the first diaphragm 31. A diaphragm outer peripheral support portion 321 is provided.
The driving member 33 has an inner peripheral portion joined to the voice coil bobbin 37 with an adhesive or the like, and an outer peripheral portion is supported by the central flat portion 42 of the frame 4 through the second edge 35 so as to be capable of vibrating. The drive member 33 is formed in a folded shape at a folded portion 331 at a substantially central portion in the radial direction, and supports the diaphragm member 30. Specifically, the drive member 33 includes a first diaphragm support portion 331A that supports the back side of the first diaphragm 31 at a turn-back portion 331 located radially inward from the inner peripheral portion 32A of the second diaphragm 32. Prepare. Further, the drive member 33 includes second diaphragm support portions (332, 333) that are formed between the folded portion 331 and the outer peripheral portion 33D and support the second diaphragm 32.

In the speaker device 1, as shown in FIGS. 2 and 3, a sealed space 71 surrounded by the diaphragm member 30, the second diaphragm 32, and the frame 4 is formed. The gas filled in the sealed space 71 is, for example, a gas such as air, and is regulated to a predetermined pressure, for example, normal pressure (atmospheric pressure). That is, the speaker device 1 configured as described above is a damperless speaker device that supports the vibrating body 3 by the air in the sealed space 71 functioning as an air spring. The volume of the sealed space 71 affects the spring constant, specifically the stiffness. For this reason, in the speaker device 1 according to the present embodiment, the volume of the sealed space 71 is defined so as to have a predetermined stiffness.
Hereinafter, each component of the speaker device 1 will be described with reference to the drawings.

[Magnetic circuit 2]
In the magnetic circuit 2, a magnetic gap is formed, and a voice coil 38 wound around a voice coil bobbin 37 is disposed in the magnetic gap. The magnetic circuit 2 is built in and supported by a frame 4 having a substantially U-shaped cross section. As the magnetic circuit 2, for example, an outer magnet type magnetic circuit, an inner magnet type magnetic circuit, or the like can be adopted. The magnetic circuit 2 according to the present embodiment employs an outer magnet type magnetic circuit.
The magnetic circuit 2 includes a yoke 21, a magnet 22, and a plate 23 as shown in FIGS.

The yoke 21 has a cylindrical portion 211 formed in the center portion, and a flange portion 212 formed in a shape extending from the bottom portion of the cylindrical portion 211 toward the radially outer side. The cylindrical portion 211 has a through-hole 214 formed at the center thereof. For example, a breathable sheet-like dustproof member 213 may be provided on the upper portion of the cylindrical portion 211. As a material for forming the yoke 21, for example, a known material such as a metal such as iron or an alloy can be employed.
The magnet 22 is disposed on the yoke 21. Specifically, the magnet 22 is formed in a ring shape and is disposed on the flat portion of the flange portion 212. The magnet 22 is formed of a permanent magnet such as a samarium / cobalt, alnico, rare earth, or ferrite magnet.
The plate 23 is formed in a ring shape, and is disposed on the magnet 22. The plate 23 is made of a known material such as metal.

In the magnetic circuit 2, a yoke 21, a magnet 22, and a plate 23 are formed concentrically. The magnetic circuit 2 is formed such that the outer diameter of the flange portion 212 of the yoke 21, the outer diameter of the magnet 22, and the outer diameter of the plate 23 are substantially the same. In this embodiment, the outer diameter of the magnet 22 is formed to be relatively larger than the outer diameters of the flange portion 212 and the plate 23. The outer diameter of the magnetic circuit 2 according to the present embodiment is, for example, an average value, a maximum value, or a minimum value of outer diameters of the yoke 21, the magnet 22, the plate 23, and the like.
In the magnetic circuit 2, as described above, a magnetic gap is formed between the inner peripheral portion of the plate 23 and the outer peripheral portion of the cylindrical portion 211 of the yoke 21. In the magnetic gap, a substantially uniform magnetic flux density distribution is formed over the entire circumference.

As shown in FIGS. 2 to 5, the voice coil bobbin 37 is formed in a cylindrical shape, and a voice coil 38 is wound around it. The voice coil bobbin 37 is joined to the inner peripheral portion of the drive member 33 in the vicinity of the upper end portion.
In the voice coil 38, for example, the conductive wire 8 is wound around the voice coil bobbin 37 in a ring shape. A voice coil 38 wound around a voice coil bobbin 37 is arranged in the magnetic gap of the magnetic circuit 2 so as to freely vibrate along the vibration direction (acoustic radiation direction).
The lead wire 81 electrically connected to the voice coil 38 is drawn to the vicinity of the upper end along the outer peripheral portion of the voice coil bobbin 37 and is, for example, a wiring 82 disposed between the drive member 33 and the diaphragm member 30. Is electrically connected. The wiring 82 is disposed, for example, along the body portion of the drive member 33 and is electrically connected to the terminal portion 5 provided on the frame 4.
Moreover, the wiring 82 is, for example, a twisted conductive wire or a conductive wire knitted.

[Reinforcing member 39]
The reinforcing member 39 reinforces the joint strength at the joint portion of the drive member 33 with the voice coil bobbin 7. Specifically, as shown in FIG. 6A, the reinforcing member 39 is formed in a ring shape, and is provided on the magnetic circuit side from the joint portion between the voice coil bobbin 37 and the inner peripheral portion of the drive member 33. As shown in FIG. 6A, the reinforcing member 39 includes a ring-shaped portion 391 having an L-shaped cross section, and a flange portion 392 having a shape extending radially outward from the upper end of the ring-shaped portion 391. Is provided. A liquid reservoir 393 is formed on the inner peripheral side of the ring-shaped portion 391 having an L-shaped cross section. The drive member 33, the reinforcing member 39, and the voice coil bobbin 37 are joined in a state where the neck portion formed on the inner peripheral portion of the drive member 33 is fitted to the liquid reservoir 393. The reinforcing member 39 is made of a known material such as resin or metal.
As described above, since the speaker device 1 includes the reinforcing member 39 having the above-described configuration, for example, a joint portion between the voice coil bobbin 37 and the drive member 33 has a relatively high joint strength and radiates a sound wave having a relatively large volume. It is possible. Further, even when the reinforcing member 39 is made by molding a resin, for example, since the flange portion 392 is formed, the reinforcing member 39 has relatively high rigidity and can reduce deformation such as warping.
Further, when the diaphragm member 30 and the drive member 33 are vibrated with a large amplitude, a large stress acts on the joint between the drive member 33 and the voice coil bobbin 37, and the voice coil bobbin 37 is easily bent. Since 37 includes the reinforcing member 39, the occurrence of deflection can be suppressed.

[Frame 4]
2-5, the cross-sectional shape is formed in the substantially U shape so that the flame | frame 4 may become a large diameter from the lower part to the upper part, as shown in FIGS. Specifically, the frame 4 has a hole 4A having an inner diameter smaller than the outer diameter of the magnetic circuit 2 at the bottom, a lower flat portion 43 formed in the vicinity of the hole 4A, and radially outward from the lower flat portion 43. A curved portion 4C that extends and is curved in the acoustic radiation direction is formed. The frame 4 has an upper flat portion 41 formed above the curved portion 4C. The upper flat portion 41 is joined to the outer peripheral portion of the first edge 34 by an adhesive or the like. That is, the outer peripheral portion of the diaphragm member 30 is joined to the upper flat portion 41 of the frame 4 via the first edge 34.
The frame 4 has a central flat portion 42 formed substantially at the center along the frame of the curved portion 4C. An outer peripheral portion of the second edge 35 is joined to the central flat portion 42 with an adhesive or the like. That is, the outer peripheral portion of the drive member 33 is joined to the central flat portion 42 of the frame 4 via the second edge 35.
In the frame 4 according to this embodiment, a vent 4D is formed in the curved portion 4C between the central flat portion 42 and the lower flat portion 43. The vent holes 4D are formed at regular intervals in the circumferential direction. The frame 4 is made of, for example, a metal such as iron, an alloy, or a resin.

[Terminal part 5]
The terminal portion 5 is electrically connected to the voice coil 38 via the conductive wire 8. Specifically, a lead wire 81 drawn out from the voice coil 38 is electrically connected to one end portion of the wiring (nishiki wire) 82, and the other end portion of the wiring 82 is connected to the terminal portion 5. As shown in FIGS. 3 and 5, the terminal portion 5 according to the present embodiment includes an internal terminal portion 51 and an external terminal portion 52.
The internal terminal portion 51 is provided, for example, inside the frame 4. In this embodiment, the internal terminal portion 51 is provided inside the frame 4 in the sealed space 71 surrounded by the diaphragm member 30, the second diaphragm 32, and the frame 4. Is provided.
The external terminal portion 52 is provided on the outer peripheral side of the frame 4 and is electrically connected to the internal terminal portion 51. The external terminal unit 52 is electrically connected to an external device such as a sound processing device, an amplifier, a tuner, a television, or an audio device via a conductive wire. In the present embodiment, each of the internal terminal portion 51 and the external terminal portion 52 includes two terminals.

[Protective member 6]
As shown in FIGS. 1 to 3, the protection member 6 is formed in a ring shape, for example, and is disposed on the upper end portion of the frame 4. Further, the protective member 6 has a convex cross-sectional shape, and the top portion is formed higher than the first edge 34, so that problems such as contact of obstacles with the first edge 34 and the diaphragm member 30 are prevented. Deter.

[Vibrating body 3]
The outer periphery of the vibrating body 3 is supported by the frame 4 so as to freely vibrate. The vibrating body 3 according to the present embodiment includes a diaphragm member 30, a driving member 33, a first edge 34, a second edge 35, a voice coil bobbin 37, and a voice coil 38. Each component is formed concentrically.

[Vibration plate member 30]
The outer periphery of the diaphragm member 30 is supported by the frame 4 so as to freely vibrate. The diaphragm member 30 is formed in a flat plate shape, and a flat surface is formed on the acoustic radiation side. The diaphragm member 30 is formed in a substantially circular shape.
The diaphragm member 30 includes the first diaphragm 31 and the second diaphragm 32 as described above. Hereinafter, the first diaphragm 31 and the second diaphragm 32 will be described in detail with reference to the drawings.

[First diaphragm 31]
FIG. 7 is a view for explaining the first diaphragm 31 of the speaker device 1 shown in FIG. Specifically, FIG. 7A is a plan view on the front surface side of the first diaphragm 31, and FIG. 7B is a plan view on the back surface side of the first diaphragm 31.
As shown in FIGS. 1 to 7 (A) and 7 (B), the first diaphragm 31 is supported by the first diaphragm outer periphery support portion of the second diaphragm 32 on the back surface of the outer periphery, and from the outer periphery. The radially inner side is supported by the first diaphragm support portion of the drive member 33.
The first diaphragm 31 according to the present embodiment is formed in a substantially circular shape. Specifically, as shown in FIGS. 7A and 7B, the first diaphragm 31 includes a region 31DA having an outer peripheral portion 31D having an outer diameter 31RA and a region 31DB having an outer diameter RB shorter than the outer diameter 31RA. . In the first diaphragm 31 according to the present embodiment, the regions 31DA and the regions 31DB are alternately formed at regular intervals along the circumferential direction.
Moreover, the 1st diaphragm 31 has the protrusion-shaped part (rib) 311 of the shape protruded in the reverse direction with respect to the acoustic radiation direction at the back surface side of outer peripheral part 31D. The rib 311 is bonded with an adhesive or the like in a state where the rib 311 is fitted in the groove portion 321 </ b> A formed in the second diaphragm 32. The rib 311 according to the present embodiment is formed in the region 31DA and is not formed in the region 31DB. Further, as shown in FIG. 6B, the rib 311 is provided radially inward from the outer peripheral portion 31D of the first diaphragm 31 by a specified interval 311R. In addition, an interval (clearance) 311H is formed in a state where the first diaphragm 31 and the second diaphragm 32 are joined.
In the diaphragm member 30 configured as described above, as shown in FIGS. 6A and 6B, when the applied adhesive protrudes from the groove 321 </ b> A when the first diaphragm 31 and the second diaphragm 32 are joined. Even so, since the interval (clearance) 311H having the above-described configuration is provided, the adhesive protruding from the groove 321A remains at the interval 311H. For this reason, it is possible to prevent the adhesive from protruding from the outer peripheral portion of the first diaphragm 31.

  Further, the first diaphragm 31 has a joining portion 312 that joins the top portion of the driving member 33 on the back surface side. The joint portion 312 is formed on the radial center side from the rib 311 and is formed relatively wide. For example, it is formed wider than the width in the radial direction of the groove portion of the drive member 33 described later. The joining portion 312 is joined to the folded portion 331 (first diaphragm supporting portion 331A) of the driving member 33 by an adhesive or the like, so that the first diaphragm 31 is supported by the driving member 33.

  The first diaphragm 31 is made of a known material such as a resin such as a polycarbonate resin, a metal, an alloy, paper, or ceramics. In the present embodiment, a polycarbonate-based resin is employed as a material for forming the first diaphragm 31.

[Second diaphragm 32]
FIG. 8 is a view for explaining the second diaphragm 32 of the speaker device 1 shown in FIG. Specifically, FIG. 8A is a plan view of the front side of the second diaphragm 32, and FIG. 8B is a plan view of the back side of the second diaphragm 32. FIG. 9 is an enlarged plan view of the vicinity of the groove portion of the second diaphragm 32 shown in FIG.

The second diaphragm 32 is formed in a ring shape, and the inner peripheral portion 32A is formed to have an inner diameter smaller than the outer diameter of the outer peripheral portion 31D of the first diaphragm.
Specifically, as shown in FIGS. 1 to 6 and FIGS. 8A and 8B, the second diaphragm 32 includes a flat portion 320, a first diaphragm outer peripheral portion support portion 321, a joint portion 322, and A bent portion 323 is provided.
As shown in FIG. 8A (A), the flat portion 320 is formed from the inner peripheral portion 32A to the outer peripheral portion, and the acoustic radiation surface is formed flat. The flat portion 320 is formed such that the surface on the acoustic radiation side is positioned substantially on the same plane as the surface on the acoustic radiation side of the first diaphragm 31. In the second diaphragm 32 according to the present embodiment, the flat portions 320 and the bent portions 323 are alternately formed at regular intervals along the circumferential direction.

The first diaphragm outer peripheral portion support portion 321 is formed on the outer side in the radial direction from the inner peripheral portion 32 </ b> A, and supports the outer peripheral portion rear surface side of the first diaphragm 31. In addition, the first diaphragm outer periphery support part 321 is formed with a groove part 321 </ b> A that fits into a rib 311 formed on the back side of the outer periphery of the first diaphragm 31. The groove portions 321A are formed at regular intervals along the circumferential direction. As shown in FIG. 6B, the groove portion 321A has a C surface 3211 formed on the outer peripheral side of the upper end portion of the groove. Further, as shown in FIG. 8A, the groove portion 321A has a planar shape formed in an arc shape, and is formed in a planar U shape in which both ends 321B and 321C of the groove portion 321A extend radially inward. ing.
As shown in FIG. 9, in general, when an adhesive is applied to the groove 321A, the amount of the adhesive is relatively large at the start of application and at the end of application. Since it is formed into a shape, the amount of excess adhesive that overflows can be reduced.

  In the speaker device 1 according to the present embodiment, the C surface 3211 is formed at the corner of the groove portion 321A, and the rib 311 of the first diaphragm 31 is formed slightly inward in the radial direction by a specified distance from the outermost periphery. Since the groove portion 321A is formed at the position where the clearance is formed and the clearance is formed between the first diaphragm 31 and the second diaphragm 32, the amount of excess adhesive overflowing can be further reduced. .

  As for the 2nd diaphragm 32, the junction part 322 joined to the drive member 33 is formed in 32 A of inner peripheral parts. The joint portion 322 is joined in a state where the joint portion 322 is fitted in a groove portion 332 formed in the drive member 33. The joint portion 322 according to the present embodiment includes two projecting portions 322 </ b> A and 322 </ b> B having two different diameters projecting in opposite directions with respect to the acoustic radiation side. The protrusions 322A and 322B are fixed by an adhesive or the like in a state where the protrusions 322A and 322B are fitted in the two groove portions 332A and 332B formed in the groove portion 332 of the drive member 33. As described above, since the grooves 332A and 332B of the drive member 33 and the protrusions 322A and 322B of the second diaphragm 32 are joined together with an adhesive or the like, the joint member has a relatively large joint strength.

The bent part 323 is formed in a shape bent in the opposite direction to the acoustic radiation direction between the inner peripheral part 32A and the outer peripheral part 32B. As shown in FIG. 8 (B), the bent portion 323 includes a convex portion 323A having a substantially U-shaped planar shape on the back surface side. The convex portion 323A includes a protrusion 3231A formed in an arc shape along the circumferential direction and a protrusion 3232A formed along a substantially radial direction. The protruding portion 3232A according to the present embodiment is formed along the boundary between the flat portion 320 and the bent portion 323. The convex portion 323 </ b> A is connected to a support portion 333 formed on the drive member 33, and the second diaphragm 32 is supported by the drive member 33.
In the speaker device 1 according to the present embodiment, the bent portion 323 of the second diaphragm 32 is supported by the support portion 333 formed on the drive member 33, and thus, for example, a simple flat plate-like second diaphragm 32 is supported. Compared to the case where the second diaphragm 32 is supported by the portion 333, the second diaphragm 32 has a relatively large rigidity, and distortion of the second diaphragm 32 is reduced when the driving force is transmitted from the driving member 33 to the second diaphragm 32. Thus, the driving force can be transmitted with relatively high efficiency.

The second diaphragm 32 has a flat portion 321D formed on the outer peripheral portion 32D, and the inner peripheral flat portion 341 of the first edge 34 is joined to the flat portion 321D with an adhesive or the like.
The second diaphragm 32 is formed of a known material such as a resin such as a polycarbonate-based resin, a metal, an alloy, paper, or ceramics.

[First edge 34]
The first edge 34 has an inner peripheral flat portion 341, an outer peripheral flat portion 342, and a deformable sectional convex portion 343, and is impermeable.
The inner peripheral flat portion 341 is joined to the outer peripheral portion of the second diaphragm 32 by an adhesive or the like, and the outer peripheral flat portion 342 is joined to the upper flat portion 41 of the frame 4 by an adhesive or the like. The first edge 34 is formed, for example, such that the upper surface of the inner peripheral flat portion 341 is located on substantially the same plane as the flat surfaces of the first diaphragm 31 and the second diaphragm 32. For this reason, in the speaker device 1 according to the present embodiment, the first diaphragm 31, the second diaphragm 32, and the flat surface formed by the inner peripheral side flat portion 341 of the first edge 34 vibrate, thereby making a comparison. It is possible to radiate sound waves in the same phase over a wide range.
In the present embodiment, the convex section 343 has a concave portion at the center top, and has both flexible deformability and relatively high rigidity.

[Drive member 33]
FIG. 10 is a plan view showing the surface side (the diaphragm member side) of the driving member of the speaker device shown in FIG. FIG. 11 is a perspective view of the surface side (the diaphragm member side) of the drive member shown in FIG. 12 is an enlarged perspective view of the vicinity of the hole formed in the drive member shown in FIG. The drive member 33 will be described with reference to FIGS.

As shown in FIGS. 2-6 and 10-12, the drive member 33 includes an inner peripheral portion 33A, an outer peripheral portion 33D, a folded portion 331, a groove portion 332, a trunk portion 33B, a cone portion 33C, an inverted cone portion 33E, and a support. It has a portion 333, a groove portion 333A, an outer peripheral flat portion 334, an outer peripheral folded portion 335, a protruding portion (rib guide) 336, a notch portion 336A, and hole portions 338 (338A to 338E).
The folding | returning part 331 is corresponded to one Embodiment of the 1st diaphragm support part which concerns on this invention. The groove portion 332 corresponds to an embodiment of the second diaphragm support portion according to the present invention. The support portion 333 corresponds to an embodiment of the second diaphragm support portion according to the present invention.

The drive member 33 is formed in a ring shape, the inner peripheral portion 33A is joined to the voice coil bobbin 37, the outer diameter of the outer peripheral portion 33D is larger than the outer diameter of the first diaphragm 31, and the outer peripheral portion 33D is The frame 4 is fixed to the frame 4 through the second edge 35 so as to freely vibrate. Further, the driving member 33 has a body portion 33B formed between an inner peripheral portion 33A and an outer peripheral portion 33D. The body portion 33B has a cone-shaped portion 33C having a shape extending from the inner peripheral portion 33A to the folded portion 331 in the acoustic radiation direction (SD), and a folded portion 331 to the outer peripheral portion 33D in the acoustic radiation direction (SD). On the other hand, it has an inverted cone portion 33E extending in the opposite direction.
The drive member 33 is disposed on the opposite side to the acoustic radiation direction (SD) of the diaphragm member 30, the inner peripheral portion 30 </ b> A is joined to the voice coil bobbin 37, and the outer peripheral portion 30 </ b> D is framed via the second edge 35. 4 is supported so as to freely vibrate. The drive member 33 is made of a known material such as resin, metal, paper, or the like. The drive member 33 according to the present embodiment is formed of resin.
The drive member 33 transmits the driving force of the voice coil 38 to the diaphragm member 30 via the first diaphragm support part and the second diaphragm support part.

The folded portion 331 (first diaphragm support portion 331A) is located radially inward from the inner peripheral portion of the second diaphragm 32, and a flat portion is formed at the top. The driving member 33 supports the first diaphragm 31 by joining the top of the folded portion 331 to the back side of the first diaphragm 31 with an adhesive or the like. Further, a side surface portion with which the inner peripheral portion of the second diaphragm 32 abuts is formed on the outer peripheral side of the folded portion 331.
The groove portion 332 (second diaphragm support portion) is formed, for example, on the radially outer side of the folded portion 331 and supports the inner periphery portion 32 </ b> A of the second diaphragm 32. Specifically, the groove portion 332 is joined in a state of being fitted to the joint portion 322 formed on the inner peripheral portion 32 </ b> A of the second diaphragm 32. In the present embodiment, the joint portion 322 of the second diaphragm 32 includes two annular-shaped projecting portions 322A and 322B projecting in opposite directions with respect to the acoustic radiation side, and the projecting portions 322A and 322B. Are fixed by an adhesive or the like in a state of being fitted into the two groove portions 322A and 322B formed in the groove portion 332 of the drive member 33.

The support part 333 (second diaphragm support part) is formed in a shape protruding in the acoustic radiation direction, and supports the back side of the second diaphragm 32. Specifically, the support portion 333 supports the bent portion 323 of the second diaphragm 32. More specifically, the support portion 333 has a groove portion 333A formed at the top. The groove 333A is fitted into a convex portion 323A formed on the back surface side of the bent portion 323 of the second diaphragm 32, and the second diaphragm 32 and the drive member 33 are connected.
Moreover, the support part 333 which concerns on this embodiment is a non-annular connection member in which the planar shape was formed in the U shape. Specifically, as illustrated in FIGS. 10 to 12, the support portion 333 includes a protrusion portion 3331 formed in an arc shape along the circumferential direction and a protrusion portion 3332 formed along the substantially radial direction. In the driving member 33 according to the present embodiment, a plurality of support portions 333 are formed at regular intervals along the circumferential direction.
Moreover, although the said support part 333 was formed in the non-ring shape, it is not restricted to this form, For example, you may form in the trunk | drum 33B of the drive member 33 cyclically | annularly along the circumferential direction.
As described above, in the speaker device 1 according to the present embodiment, the driving member 33 and the second diaphragm 32 are connected by the support portion 333 and the groove portion 332 of the driving member 33, and the driving member 33 is connected to the second diaphragm 32. Support. For this reason, the drive member 33 and the diaphragm member 30 are joined with a relatively large joint strength, and the driving force of the voice coil 38 is uniformly distributed over a relatively wide range of the second diaphragm 32 via the drive member 33. Can communicate.

  The outer peripheral flat portion 334 is supported by the frame 4 through the second edge 35 so as to be able to vibrate. Specifically, the second edge 35 is formed in a U-shaped cross section, the inner peripheral flat portion is joined to the back side of the outer peripheral flat portion 334, and the outer peripheral flat portion is the central flat portion 42 of the frame 4. It is fixed to.

The outer periphery folding portion 335 is formed at the outer peripheral end of the support portion 333. The drive member 33 has a relatively high rigidity because the outer circumferential portion folded portion 335 is formed.
The protruding portion (rib guide) 336 is formed in a shape extending in the radial direction from the body portion 33B to the outer peripheral portion 33D. Specifically, the protruding portion 336 is formed in a shape protruding along the radial direction on the outer peripheral flat portion 334, and the radially outer end portion extends to the outer peripheral folded portion 335 to support the outer peripheral folded portion 335, The radial center side end extends to the body portion 33B. As shown in FIGS. 10 and 11, the drive member 33 according to the present embodiment has two protruding portions 336 formed at regular intervals along the circumferential direction. Further, the protruding portion 336 according to the present embodiment is formed between the support portion 333 and another support portion 333 as shown in FIGS. The drive member 33 has a relatively high rigidity because the protruding portion 336 is formed in the vicinity of the outer peripheral portion.

  Moreover, as shown to FIGS. 10-12, the protrusion-like part 336 equips the upper part with the notch part 336A. The notch 336A is formed so that the wiring 82 passes therethrough. The notch 336A will be described later.

  A plurality of hole portions 338 are formed in the body portion 33B between the inner peripheral portion 33A and the outer peripheral portion 33D of the drive member 33, and the wiring (kind wire) 82 is inserted therethrough. That is, the wiring 82 is sequentially inserted into the plurality of holes 338 formed in the drive member 33, and is thereby supported by the body portion 33 </ b> B of the drive member 33. The hole 338 is preferably formed to have a diameter substantially the same as the diameter of the wiring 82. With the above configuration, it is possible to reduce a decrease in airtightness of the sealed space 71 of the speaker device 1. Further, the gap between the wiring 82 and the hole 338 may be filled with a resin or a conductive material in a state where the wiring 82 is inserted into the hole 338. By doing so, it is possible to further reduce the decrease in the airtightness of the sealed space 71.

In the driving member 33 according to the present embodiment, five holes 338A to 338E are formed in the body portion 33B per wiring 82, that is, a total of ten wiring holes 338 are formed. Specifically, the holes 338A to 338C are formed in an inverted cone-shaped portion 33E between the folded portion 331 and the outer peripheral portion 33D, and the holes 338D and 338E are formed in a cone-shaped portion 33C between the inner peripheral portion 33A and the folded portion 331. Is formed.
As shown in FIGS. 10 to 12, the holes 338 </ b> D and 338 </ b> E are formed at regular intervals along the circumferential direction. The wiring 82 is inserted into the holes 338D and 338E so that a part of the wiring 82 is exposed to the surface side of the driving member 33. The wiring 82 of the driving member 33 between the hole portions 338D and 338E functions as a wiring-type terminal portion 80, and a lead wire 81 drawn from the voice coil 38 is electrically connected. Further, the wiring-type terminal portion 80 has a part of the wiring inserted through the plurality of holes 338D and 338E formed between the inner peripheral portion of the driving member 33 and the first diaphragm member supporting portion. 33 may be exposed on the front surface side or the back surface side of 33.

  The drive member 33 has a hole 338D formed on the radially inner peripheral side of the groove 332 functioning as a second diaphragm support portion, a hole 338C formed on the radially outer peripheral side of the groove 332, and the wiring 82 The hole 338 </ b> D and the hole 338 </ b> C are inserted and supported by the drive member 33 so as to pass through the back side of the groove 332 (second diaphragm support portion). As described above, in the speaker device 1 according to the present embodiment, the wiring 82 bypasses the back side of the groove portion 332 (second diaphragm support portion) of the driving member 33, so that, for example, the groove portion for wiring passage is used as the second diaphragm. The wiring 82 can be routed from the inner peripheral portion of the drive member 33 to the outer peripheral portion with a simple configuration without being provided in the support portion.

As shown in FIGS. 10 to 12, in the driving member 33 according to the present embodiment, one support portion 333 is formed between the wiring type terminal portion 80 and the terminal portion 5. In the present embodiment, the drive member 33 has a plurality of holes 338 so that the wiring 82 bypasses the support portion 333. The wiring 82 is disposed on the driving member 33 so as to bypass the support portion 333 while being inserted into the plurality of holes 338.
Specifically, the two wires 82 routed along the body portion 33B of the drive member 33 are routed around so as to sandwich the support portion 333 located in the vicinity thereof. The holes 338 </ b> A to 338 </ b> C are formed between the support part 333 (second diaphragm support part) of the drive member 33 and another support part 333 (second diaphragm support part).
Thus, in the speaker device 1 according to the present embodiment, the wiring 82 is arranged so that the driving member 33 bypasses the support portion (second diaphragm support portion) that supports the second diaphragm 32. The wiring 82 can be disposed between the inner peripheral portion and the outer peripheral portion of the drive member 33 with a simple configuration.

  Further, as shown in FIGS. 10 and 11, the drive member 33 has a U-shaped planar shape between the hole portion 338 </ b> B and the hole portion 338 </ b> A through which the left-side wire 82 of the two wires 82 is inserted. A portion 333 is formed. The wiring 82 on the left side is drawn around the support portion 333 by passing through the hole portion 338B and the hole portion 338A and passing through the back surface side of the drive member 33. As described above, the wiring 82 according to the present embodiment is arranged around the support portion 333 of the driving member 33 with a simple configuration.

Further, the holes 338A to 338D are formed in a substantially linear shape at predetermined intervals along the radial direction. The wiring 82 is inserted into the holes 338C and 338B so as to be disposed between the hole 338C and the hole 338B on the surface side of the drive member 33. Further, the wiring 82 is inserted into the holes 338B and 338A so as to be disposed between the hole 338B and the hole 338A on the back surface side of the drive member 33. The wiring 82 that has passed through the hole 338 </ b> A from the back surface side to the front surface side of the driving member 33 is drawn to the internal terminal portion 51 of the terminal portion 5 via the notch portion 336 </ b> A formed in the protruding portion 336.
In the present embodiment, the hole 338B is formed at a position shifted to the opposite side with respect to the terminal portion 5 from the linear center position of the hole 338C and the hole 338A. When the wiring 82 is bent at the notch 336A via the hole 338B and the hole 338A and then connected to the terminal portion 5, the bending angle can be reduced relatively small.

In the speaker device 1 having the above-described configuration, the wiring 82 is bent after contacting the hole 338A and the notch 336A of the protruding portion 336 and then connected to the internal terminal portion 51. It is possible to prevent the hole 338A from being detached from the notch 336A. Further, the notch portion 336A and the hole portion 338A of the protruding portion 336 are formed relatively close to each other. For example, the hole portion 338A is formed between the central portion and the outer peripheral portion of the body portion of the drive member 33. Yes. For example, specifically, the notch 336 </ b> A and the hole 338 </ b> A are formed at a distance of 2 to 10 times the diameter of the wiring 82.
Thus, the notch 336A of the protrusion 336 is formed in the vicinity of the hole 338A, and the wiring 82 is bent after being in contact with the hole 338A and the notch 336A of the protrusion, and is connected to the terminal portion 51. Therefore, it is possible to reduce the disconnection of the wiring 82 from the notch 336A.
Further, since the notch 336A of the protrusion 336 is formed in the vicinity of the hole 338A, the workability is improved such that the wiring 82 is easily hooked on the notch 336A and the wiring 82 is difficult to come off during manufacture. .
Further, since the driving member 33 is provided with the protruding portion (rib guide) 336 as described above, the vicinity of the protruding portion 336 of the driving member 33 has a relatively high strength, and the wiring 82 is disposed and supported. Even when the weight of the portion 333 is locally relatively large, the deflection of the outer peripheral portion of the body portion can be reduced. In addition, abnormal vibration of the support portion 333 can be reduced.

  The vent hole portion 339 is formed between the inner peripheral portion 33A of the driving member 33 and the groove portion 332, for example, and functions as a vent hole to the outside of the speaker.

[Second edge 35]
As shown in the drawing, the second edge 35 includes an inner peripheral flat portion 351, an outer peripheral flat portion 352, and a deformable U-shaped section 353 that is non-breathable.
The inner peripheral flat portion 351 is bonded to the outer peripheral portion 33D of the drive member 33 by an adhesive or the like, and the outer peripheral flat portion 352 is bonded to the central flat portion 42 of the frame 4 by an adhesive or the like.
In the present embodiment, since the first edge 34 is formed in a convex cross section and the second edge 35 is formed in a U-shaped cross section, the volume of the sealed space 71 in the speaker device 1 is relatively large.

[Manufacturing Method of Speaker Device 1]
A specific example of the method for manufacturing the speaker device 1 according to the present embodiment will be described with reference to the drawings.

  FIG. 13 is a cross-sectional view for explaining the operation during assembly of the voice coil bobbin and the ring-shaped reinforcing member shown in FIG. FIG. 14 is a cross-sectional view for explaining a state where the voice coil bobbin and the reinforcing member shown in FIG. 13 are fitted. FIG. 15A is a cross-sectional view for explaining the operation of assembling the drive member, ring-shaped reinforcing member, and voice coil bobbin shown in FIG. 2, and FIG. 15B shows the inner peripheral portion of the drive member. It is sectional drawing for demonstrating the state fitted to the voice coil bobbin. 15A and 15B, the left cross section of each member is shown, and the right cross section is omitted.

As shown in FIGS. 13 and 14, the jig 9 is used to place a ring-shaped reinforcing member 39 at a predetermined position of the voice coil bobbin 37 around which the voice coil 38 is wound, and fix it with an adhesive or the like. explain.
The jig 9 according to the present embodiment includes a first jig 91 and a second jig 91. The first jig 91 has a center pole portion 911 and a cylindrical portion 912. The center pole portion 911 and the tubular portion 912 are connected at the bottom, and a groove portion is formed between the outer periphery of the center pole portion 911 and the inner periphery of the tubular portion 912. The second jig 92 is formed in a cylindrical shape and has a center hole 921. The second jig 92 is formed in a shape that fits into the groove of the jig 91. The second jig 92 is formed so as to be fitted to the inner peripheral side of the voice coil bobbin 37. The second jig 92 has a stepped portion 923 formed on a substantially central side surface.
First, as shown in FIGS. 13 and 14, the voice coil bobbin 37 is inserted into the reinforcing member 39 with the end portion around which the voice coil 38 is wound facing up, and the second coil is formed on the inner peripheral side of the voice coil bobbin 37. The tool 92 is inserted, and the second jig 92 is fitted to the first jig 91. At this time, as shown in FIG. 14, the end portion 37 </ b> A of the voice coil bobbin 37 is in contact with the stepped portion 923 of the second jig 92.
Further, as shown in FIG. 14, the voice coil bobbin 37 and the reinforcing member 39 are in a specified position in a state where the end surface 392A of the flange portion 392 of the reinforcing member 39 and the upper end surface 912A of the cylindrical portion 912 are in contact with each other. Positioned.
Then, as shown in FIG. 14, the voice coil bobbin 37 and the reinforcing member 39 are joined to an inclined portion 391A formed at the inner peripheral end of the ring-shaped portion 391 by an adhesive or the like. After a predetermined time, the voice coil bobbin 37 is removed from the jig 9.

Next, as shown in FIGS. 15A and 15B, the drive member 33 is attached to the voice coil bobbin 37 to which the reinforcing member 39 is joined. Specifically, the adhesive 95 is applied to the liquid reservoir 393 formed inside the flange portion 392 of the reinforcing member 39. In this state, the neck portion formed on the inner peripheral portion 33 </ b> A of the drive member 33 is fitted into the voice coil bobbin 37 and fixed by the adhesive 95.
At this time, the reinforcing member 39 according to the present embodiment is formed with a flange portion 392 having a shape extending radially outward at the upper end portion of the ring-shaped portion 391 having an L-shaped cross section. Overflow can be suppressed. Further, the reinforcing member 39 according to the present embodiment is formed of a resin material. However, since the reinforcing member 39 includes the flange portion 392, the reinforcing member 39 has relatively high rigidity and can reduce deformation such as warping.

Next, as shown in FIGS. 2 to 4, the magnetic circuit 2 is arranged on the lower flat portion 43 of the frame 4 so that the voice coil 38 provided on the voice coil bobbin 37 is positioned in the magnetic gap of the magnetic circuit 2. In addition, the driving member 33 to which the second edge 35 is attached is disposed. The outer peripheral portion of the second edge 35 is fixed to the central flat portion 42 of the frame 4 with an adhesive or the like.
In the drive member 33, the wiring 82 is inserted through the plurality of holes 338A to 338E. At this time, the wiring 82 is sequentially inserted into the plurality of holes 338 and is alternately arranged on the front surface and the back surface of the driving member 33. The lead wire 81 drawn from the voice coil 38 is electrically connected to the wiring type terminal portion 80 formed by the wiring 82 inserted through the holes 338D and 338E.
Next, the terminal portion 5 is disposed at a predetermined position of the frame 4, and the end portion of the wiring 82 is electrically connected to the internal terminal portion 51.

Next, as shown in FIGS. 2 to 6, the ring-shaped second diaphragm 32 is disposed on the drive member 33. Specifically, the groove portion 332 of the drive member 33 and the joint portion 322 of the second diaphragm 32 are joined. Specifically, the groove portions 332A and 332B and the joint portions 322A and 322B are fixed with an adhesive or the like in a state where the grooves are joined.
Further, the support portion 333 of the drive member 33 supports the back side of the bent portion 323 of the second diaphragm 32. Specifically, the groove portion 333A of the support portion 333 of the drive member 33 is fixed by an adhesive or the like in a state where the groove portion 333A is joined to the convex portion 323A provided on the back surface side of the bent portion 323 of the second diaphragm 32.
A ring-shaped first edge 34 is fixed to the outer peripheral portion 32 </ b> D of the second diaphragm 32, and the outer peripheral portion of the edge of the first edge 34 is bonded to the upper flat portion 41 of the frame 4. It is fixed by.

Next, as shown in FIGS. 2 to 6, the first diaphragm 31 is disposed on the second diaphragm 32.
Specifically, an adhesive is applied to the groove portion 321A (first diaphragm outer peripheral support portion 321) of the second diaphragm 32, and the top of the folded portion 331 (first diaphragm support portion 331A) of the drive member 33 is applied. Apply adhesive. The rib 311 of the first diaphragm 31 is fitted into the groove 321A of the second diaphragm 32, and the top of the folded portion 331 of the drive member 33 is joined and fixed to the joint 312 of the first diaphragm 31. To do.
The speaker device 1 according to this embodiment can be manufactured by the manufacturing process described above.

[Operation of Speaker Device 1]
Next, the operation of the speaker device 1 having the above configuration will be briefly described.
For example, an audio signal is input to the external terminal unit 52 of the terminal unit 5 from an external device such as an audio processing device, an amplifier, or a tuner. The audio signal is input from the external terminal portion 52 to the voice coil 38 via the internal terminal portion 51, the wiring 82, and the lead wire 81. The voice coil 38 disposed in the magnetic gap of the magnetic circuit 2 generates a driving force (Lorentz force) along the vibration direction (vertical direction) according to the audio signal. This driving force is transmitted to the driving member 33 via the voice coil bobbin 37 to vibrate the driving member 33 along the vibration direction.
Further, the driving force is transmitted from the driving member 33 to the inner peripheral portion of the second diaphragm 32 through the groove portion 332 (second diaphragm supporting portion), and passes through the supporting portion 333 (second diaphragm supporting portion). This is transmitted to the vicinity of the outer periphery of the second diaphragm 32 to drive the second diaphragm 32 substantially uniformly.
The driving force is transmitted from the second diaphragm 32 to the outer peripheral portion of the first diaphragm 31 via the first diaphragm outer peripheral support portion 321. In addition, the driving force is transmitted from the driving member 33 to the joint portion 312 on the back surface side of the first diaphragm 31 through the folded portion 331 (first diaphragm support portion 331A). Then, the first diaphragm 31 is driven substantially uniformly.
The driving force is transmitted substantially uniformly over a comparatively wide range of the first diaphragm 31 and the second diaphragm 32. Then, the first diaphragm 31 and the second diaphragm 32 formed in a flat plate shape vibrate substantially uniformly over a relatively wide range. And the diaphragm member 30 provided with the 1st diaphragm 31 and the 2nd diaphragm 32 vibrates, and the sound wave (plane wave) of the same phase is radiated | emitted in an acoustic radiation direction in a comparatively wide range.

  As described above, in the speaker device 1 according to the present embodiment, the magnetic circuit 2 and the outer peripheral portion 31D are supported by the second diaphragm 32, and the joint portion 312 positioned radially inward from the outer peripheral portion 31D. And the first diaphragm 31 supported by the driving member 33 and the first diaphragm outer periphery support portion 321 for supporting the outer peripheral portion rear surface side of the first diaphragm 31 and the outer periphery thereof by the first edge 34. The second diaphragm 32 supported by the frame 4 so as to vibrate freely and the inner peripheral portion 33A are joined to the voice coil bobbin 37, and the outer peripheral portion 33D can vibrate to the central flat portion 42 of the frame 4 via the second edge 35. The drive member 33 is supported by the first vibration plate support portion 331A, and the drive member 33 supports the back side of the first vibration plate 31 at the turn-back portion 331, and between the turn-back portion 331 and the outer peripheral portion 33D. Since the second diaphragm support part (groove part 332, support part 333) that is formed and supports the second diaphragm 32 is provided, the first diaphragm in which the driving member 33 is formed with a driving force of the voice coil 38 in a flat plate shape. 31 and the second diaphragm 32 can be transmitted uniformly over a relatively wide range.

  That is, in the speaker device 1, since the driving member 33 supports the first diaphragm 31, the first diaphragm 31 has a relatively large rigidity. In addition, since the speaker device 1 supports the second diaphragm 32 with the driving member 33, the second diaphragm 32 and the first diaphragm 31 can vibrate in substantially the same phase.

In the speaker device 1, the second diaphragm 32 has a bent portion 323 between the inner peripheral portion and the outer peripheral portion, and a part of the driving member 33 is connected to the bent portion 323. Compared to the flat plate shape, the rigidity is increased, and the vibration from the drive member 33 is easily transmitted to the second diaphragm 32. Therefore, the first and second diaphragms can vibrate with substantially the same phase.
Further, since the driving member 33 supports the first and second diaphragms, the first and second diaphragms can vibrate more in the same phase.

  In addition, the diameter of the first diaphragm 31 is substantially the same as or larger than the diameter of the magnetic circuit 2, the second diaphragm 32 is disposed so as to surround the first diaphragm 31, and the support portion 333 is connected to the magnetic circuit 2. Further, the speaker device 1 can be thinned by disposing it on the outside.

Further, the speaker device 1 having the above-described configuration can radiate sound waves having the same phase in a relatively wide range because the flat plate-like diaphragm member having a flat surface on the acoustic radiation direction side vibrates.
Moreover, the speaker device 1 having the above-described configuration can provide a relatively high-quality reproduced sound. In particular, the acoustic characteristics can be made relatively flat from the low range to the middle range, and high-quality acoustic characteristics can be provided to the user.

Further, in a general speaker device, when a vibrating body is vibrated with a large amplitude, stress acts on a joint portion of the vibrating body.
On the other hand, in the speaker device 1 according to the present invention, a sealed space 71 is formed by the second diaphragm 32, the driving member 33, the first edge 34, and the second edge 35, and the air in the sealed space 71 is formed. The pressure difference (air spring) is used to prevent the speaker device 1 from vibrating with an excessive amplitude. Furthermore, the speaker device 1 has a relatively large bonding strength because the inner peripheral end of the second diaphragm 32 and the groove 332 of the drive member 33 are fitted and bonded with an adhesive. Even if a relatively large stress acts, it is possible to suppress the occurrence of peeling or the like.

  Further, since the driving member 33 has the protruding portion 336 extending in the radial direction from the body portion to the outer peripheral portion, the driving member 33 has a relatively large rigidity, in particular, a rigidity along the radial direction. Further, it is possible to suppress the occurrence of deflection or the like in the drive member 33, and the first and second diaphragms can be vibrated substantially in phase.

  In addition, since the driving member 33 according to the present embodiment includes the support portion 333 having a substantially U-shaped planar shape, the support force with respect to the second diaphragm 32 is increased. In addition, the rigidity of the entire vibrator can be increased.

  Further, the support portion 33 has a substantially U-shaped planar shape, and the second diaphragm 32 includes a convex shape portion 323A having a planar shape substantially the same as the planar shape of the support portion 33, so that the second vibration The plate 32 has a relatively large rigidity. Further, since the height of the convex portion 323A is substantially equal to the height of the first diaphragm 31, the phase of the emitted sound wave can be made more equal.

In the speaker device 1, the diaphragm 31 has an outer diameter substantially equal to or larger than that of the magnetic circuit 2, and therefore, the joint portion between the first diaphragm 31 and the driving member 33 is disposed near the outer periphery of the magnetic circuit 2. Even if the vibrating body 3 vibrates, it is possible to suppress contact with the magnetic circuit 2 and the like.
In addition, the first diaphragm 31 and the drive member 33, the first diaphragm 31 and the second diaphragm 32, and the joint portion of the second diaphragm 32 and the drive member 33 are located near or outside the outer diameter of the magnetic circuit 2. Since it can arrange | position outside, it can suppress that each junction part contacts the magnetic circuit 2 or the flame | frame 4, etc. Moreover, the space in the speaker device can be used effectively, and the height of the speaker device 1 in the axial direction can be reduced.

[Second Embodiment]
FIG. 16 is a cross-sectional view of the speaker device 1A according to the second embodiment of the present invention. The description of the same configuration as that of the first embodiment is omitted.
In the speaker device 1A according to the present embodiment, as shown in FIG. 16, the voice coil bobbin 37B is formed longer in the axial direction than the voice coil bobbin 37 according to the first embodiment, and the upper end portion 375 of the voice coil bobbin 37B is The first diaphragm 31 is joined to the back side. For example, the upper end portion 375 of the voice coil bobbin 37B and the first diaphragm 31 may be joined with an adhesive. Moreover, you may make joint strength high by providing a fitting part, a to-be-fitted part, etc. in the 1st diaphragm 31 and the voice coil bobbin 37B.

  In the speaker device 1A having the above-described configuration, the driving force of the voice coil 38 is transmitted to the vicinity of the central portion of the first diaphragm 31 via the upper end portion 375 of the voice coil bobbin 37B. The driving force can be transmitted uniformly to the diaphragm 31 and the second diaphragm 32 over a relatively wide range. Further, a more uniform in-phase sound wave can be emitted over a relatively wide range of the first diaphragm 31 and the second diaphragm 32.

The present invention is not limited to the embodiment described above. For example, you may implement combining the said embodiment. Moreover, you may implement independently about each component.
For example, the speaker device according to the above-described embodiment is formed in a circular shape when viewed from the acoustic radiation side, but is not limited to this form. The speaker device may be formed in, for example, a rectangular shape, a polygonal shape, an elliptical shape, or the like.
In the speaker device according to the above embodiment, the terminal portion 5 (internal terminal portion 51) is provided in the sealed space 71. However, the present invention is not limited to this configuration. For example, it may be provided at a place other than that of the frame 4.

Claims (13)

A magnetic circuit in which a voice coil wound around a voice coil bobbin is disposed in a magnetic gap;
A plate-shaped diaphragm member whose outer periphery is supported by the frame so as to freely vibrate;
Arranged on the opposite side to the acoustic radiation direction of the diaphragm member, the inner peripheral portion is joined to the voice coil bobbin, the outer peripheral portion is supported by the frame so as to be able to vibrate, and from the inner peripheral portion to the outer peripheral portion, Drive that extends in a cone shape toward the acoustic radiation direction and is folded back in the opposite direction to the acoustic radiation direction at the folded portion, and transmits the driving force of the voice coil to the diaphragm member And having a member
The diaphragm member includes a first diaphragm formed in a flat plate shape, an inner peripheral portion formed to have an inner diameter smaller than an outer diameter of the first diaphragm, and a back surface side of the outer peripheral portion of the first diaphragm. A ring-shaped second diaphragm having a first diaphragm outer peripheral support portion to
The drive member includes a first diaphragm support part that supports a back surface side of the first diaphragm at the folded part positioned radially inward from an inner peripheral part of the second diaphragm, the folded part, A speaker device, comprising: a second diaphragm supporting portion that is formed between the outer peripheral portion and supports the second diaphragm.   The second diaphragm has a bent portion that is bent in an opposite direction to the acoustic radiation direction between an inner peripheral portion and an outer peripheral portion, and the bent portion and the driving member are connected to each other. The speaker device according to claim 1. The second diaphragm support portion of the drive member includes a groove portion formed on a radially outer peripheral side of the folded portion,
2. The speaker device according to claim 1, wherein the second diaphragm is formed on an inner peripheral portion and includes a joint portion that joins the groove portion of the drive member.   The second diaphragm support part of the drive member includes a support part having a shape protruding in the acoustic radiation direction, and the support part supports a bent part of the second diaphragm. The speaker device described.   The speaker device according to claim 1, wherein the driving member is formed with a protruding portion having a shape extending in a radial direction from a body portion to an outer peripheral portion.   The speaker device according to claim 4, wherein the support portion of the driving member is formed in a substantially U shape in a planar shape. The support portion of the drive member includes the support portion having a planar shape formed in a substantially U shape,
5. The speaker device according to claim 4, wherein the second diaphragm includes a convex portion formed in substantially the same shape as the planar shape of the support portion of the driving member.   The speaker device according to claim 1, wherein the first diaphragm is formed to have an outer diameter substantially equal to or larger than that of the magnetic circuit. The second diaphragm is supported by the frame through the first edge so as to freely vibrate,
The speaker device according to claim 1, wherein the driving member is supported by the frame through a second edge so as to be capable of vibrating. The magnetic circuit includes a plate, a magnet, and a yoke,
The speaker device according to claim 1, wherein the magnetic circuit is supported by a frame.   The speaker device according to claim 1, wherein a sealed space surrounded by the second diaphragm, the driving member, and the frame is formed, and air in the sealed space functions as an air spring.   The speaker device according to claim 1, wherein the first diaphragm is made of polycarbonate resin.   The speaker device according to claim 1, wherein the driving member has an outer diameter larger than an outer diameter of the first diaphragm.

Images