JP5002057B2 - Speaker device and method for manufacturing speaker device - Google Patents

Description

  The present invention relates to a speaker device and a method for manufacturing the speaker device.

A speaker device provided with an elongated diaphragm is known (for example, see Patent Document 1).
The speaker device is an internal magnet type magnetic circuit, and has a substantially U-shaped cross section in the short direction, a rectangular magnet disposed on the yoke, and a rectangular shape disposed on the magnet. And a top plate. In this magnetic circuit, the planar shape viewed from the vibration direction is formed in a rectangular shape, and a linear magnetic gap is formed along the longitudinal direction.
The yoke has a side portion formed along the magnetic gap, and no side portion is formed at the end in the longitudinal direction. The speaker device has a track-shaped voice coil joined to an elongated diaphragm. This voice coil has a straight portion and a semicircular curved portion. The voice coil has a straight line portion disposed in the magnetic gap of the magnetic circuit and a curved line portion disposed outside the longitudinal end of the magnetic circuit.

Japanese Patent No. 3156538

In the above speaker device, the linear portion of the voice coil is disposed in the magnetic gap of the magnetic circuit, and the longitudinal end of the voice coil is disposed outside the longitudinal end of the magnetic circuit. At the end in the longitudinal direction, the magnetic flux density is small because it is away from the magnetic gap. In this speaker device, when a signal current is applied to the voice coil during driving, Lorentz force is generated in the linear portion of the voice coil, but Lorentz force (driving force) generated in the longitudinal end portion of the voice coil is small. The diaphragm may vibrate unevenly and sound quality may deteriorate.
For this reason, it is desired to output a sound wave having a high sound quality and a relatively high sound pressure with a speaker device including an elongated diaphragm and a magnetic circuit.

Incidentally, a general speaker device includes a magnetic circuit including a yoke, a magnet, and a plate, a voice coil, a diaphragm, and a frame. In this speaker device manufacturing method, for example, the voice coil is bonded to the diaphragm based on the outer periphery of the diaphragm, and the yoke of the magnetic circuit is bonded to the frame based on the outer periphery of the vibration plate bonding part of the frame. A speaker device is manufactured by adhering a magnet and a pole on a yoke of a magnetic circuit on the basis of the size (inner peripheral surface of the side surface portion of the yoke). In the above speaker device manufacturing method, since the assembly accuracy is defined by the accumulation of the tolerances of the respective components, the positional accuracy between the voice coil and the magnetic circuit may be relatively low.
Further, in the above speaker device manufacturing method, the gap (gap) between the voice coil and the plate or yoke is not constant over the entire circumference, the gap gap variation is relatively large for each product, and the positional accuracy is relatively low. May cause problems.
Therefore, a speaker device manufacturing method that can manufacture a speaker device with high accuracy is desired. In particular, a method of manufacturing a speaker device that can position a voice coil and a plate with high accuracy is desired.

In addition, if the assembly accuracy of the speaker device is relatively low, the voice coil arranged in the magnetic gap of the magnetic circuit may come into contact with the yoke or plate, causing abnormal noise, a decrease in driving force, etc. is there. For this reason, in a general speaker device, the magnetic circuit requires a relatively wide magnetic gap. However, in the above speaker device, since the magnetic circuit has a relatively wide magnetic gap, the magnetic flux density is relatively small in the magnetic gap, and the Lorentz force generated in the voice coil when the speaker is driven is relatively small and is radiated from the diaphragm. The sound pressure of the sound wave is relatively small.
For this reason, a speaker device including a magnetic circuit in which a relatively narrow magnetic gap is formed is desired. In addition, a speaker device that can emit a sound wave having a relatively high sound pressure with a simple structure is desired.

  This invention makes it an example of a subject to cope with such a problem. That is, a speaker device having an elongated diaphragm and a magnetic circuit, having a relatively large magnetic flux density near the longitudinal end of the magnetic circuit, and having a relatively simple structure and high sound quality and high sound pressure. Providing a speaker device capable of outputting, Providing a speaker device including a magnetic circuit in which a relatively narrow magnetic gap is formed, Producing the speaker device easily and with high accuracy, It is an object of the present invention to position the plate with high accuracy.

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 is joined to a diaphragm having a planar shape perpendicular to the vibration transmission direction of a vibration source having a longitudinal direction and a short direction, and to the diaphragm directly or via a voice coil bobbin, A planar shape perpendicular to the vibration transmission direction is formed in an annular shape, and a voice coil having at least a linear portion along the longitudinal direction, and a planar shape perpendicular to the vibration transmission direction that drives the voice coil are short from the longitudinal direction. A magnetic circuit having a hand direction, and a frame that holds the magnetic circuit and supports the diaphragm so as to vibrate, the magnetic circuit comprising a bottom surface having a shape having a longitudinal direction and a short direction; A yoke having a short side end portion and a long side end portion of the bottom surface portion and a side surface portion having a magnetic gap only at the short end portion, and disposed on the bottom surface portion of the yoke. And a plate disposed on the magnet, a linear magnetic gap is formed along the longitudinal direction between the plate and the yoke, and the voice coil is connected to the magnetic circuit. Are arranged in the magnetic gap of the yoke and extend outward in the longitudinal direction from the longitudinal end portion of the bottom surface portion of the yoke, and the outer or inner central portion constituting the magnetic gap is in the longitudinal direction of the bottom surface portion of the yoke. It has the protrusion part which protruded toward the longitudinal direction outer side from the edge part of this.

  The method for manufacturing a speaker device according to the present invention includes a diaphragm having a planar shape perpendicular to the vibration transmission direction of a vibration source having a longitudinal direction and a short direction, and joined to the diaphragm directly or via a voice coil bobbin. A plane shape orthogonal to the vibration transmission direction is formed in an annular shape, and has a voice coil having at least a linear portion along the longitudinal direction, and a plane shape orthogonal to the vibration transmission direction that drives the voice coil Is a method of manufacturing a speaker device having a magnetic circuit having a longitudinal direction and a short direction, and a frame that holds the magnetic circuit and supports the diaphragm so as to vibrate, the magnetic circuit comprising: A bottom surface portion having a shape having a short side direction, and a side surface portion having a magnetic gap only at an end portion in the short side direction among an end portion in the short direction and an end portion in the long direction of the bottom surface portion. A yoke disposed on the bottom surface of the yoke, and a plate disposed on the magnet, and a straight line between the plate and the yoke along the longitudinal direction. The voice coil is disposed in the magnetic gap of the magnetic circuit, and extends outward in the longitudinal direction from the longitudinal end of the bottom surface of the yoke, and forms the magnetic gap. Or an inner central portion has a protruding portion that protrudes outward in the longitudinal direction from the longitudinal end portion of the bottom surface portion of the yoke, and joins the frame, the diaphragm, and the voice coil to form an assembly. A first step to be manufactured; and an outer portion or an inner central portion of the magnetic gap that forms the magnetic gap when the assembly and the magnetic circuit are joined; and a voice coil of the assembly. The inner peripheral portion and the reference of positioning is performed between the assembly and the magnetic circuit, and having a second step of bonding the said assembly and said magnetic circuit.

FIG. 1A is a plan view of the speaker device 1 according to the first embodiment of the present invention, and FIG. 1B is taken along line BB of the speaker device 1 shown in FIG. FIG. 1C is a cross-sectional view taken along line CC of the speaker device 1 shown in FIG. 2A is a cross-sectional view for explaining the tolerance of the thickness of the yoke 21 and the tolerance and inclination when the yoke 21 is processed. FIG. 2B is for explaining the tolerance and inclination when the yoke is processed. FIG. 3A is a perspective view from the upper surface side of the magnetic circuit 2 of the speaker device 1 shown in FIGS. 1B and 1C. FIG. 3B is a perspective view of FIG. FIG. 3C is a perspective view from the back side of the magnetic circuit 2 of the speaker device 1 shown in FIG. 1C, and FIG. 3C is the back side of the diaphragm 33, the voice coil bobbin 32, and the frame 4 of the speaker device 1. FIG. FIG. 4A is a bottom view of the back surface side in which the main part of the speaker device 1 shown in FIG. FIG. 4B is a bottom view of the back side of the voice coil 31 and the yoke 21 shown in FIGS. 1A and 1B. FIG. 5 is a flowchart for explaining a method of manufacturing the speaker device 1 according to the first embodiment of the present invention shown in FIGS. 1 (A) to 1 (C). FIG. 6A is a cross-sectional view for explaining the assembly operation of the voice coil 31, the voice coil bobbin 32, the diaphragm 33, the edge 34, and the frame 4, and FIG. 6B shows each component by the jig G1. It is sectional drawing for demonstrating this positioning operation | movement. 7A is a cross-sectional view for explaining a process of assembling the yoke 21, the magnet 22 and the plate 23, and FIG. 7B is a cross-sectional view for explaining the positioning operation of each component by the jig G1. FIG. FIG. 8 is an enlarged bottom view of the main part of the speaker device 1 and the jig G3 shown in FIG. 9A is a cross-sectional view in the short direction for explaining the positional relationship between the voice coil 31, the plate 23, and the jig G3 of the speaker device 1, and FIG. 9B is a voice coil of the speaker device 1. 31 is a cross-sectional view in the longitudinal direction for explaining the positional relationship among 31, plate 23, and jig G3. FIG. 10 is a back view of the main part of the speaker device 1 and the jig GA3 according to the second embodiment of the present invention. FIG. 11 is a plan view of a speaker device 1B according to a third embodiment of the present invention, and FIG. 11B is a cross-sectional view taken along line BB of the speaker device 1B shown in FIG. FIG. 11C is a cross-sectional view taken along the line CC of the speaker device 1B shown in FIG. 12A is a perspective view from the top surface side of the magnetic circuit 2B of the speaker device 1B shown in FIGS. 11B and 11C. FIG. 12B is a perspective view of FIG. FIG. 12C is a perspective view from the back side of the magnetic circuit 2B of the speaker device 1B shown in FIG. 11C, and FIG. 12C shows the diaphragm 33 and the voice of the speaker device 1B shown in FIG. FIG. 6 is a perspective view from the back side of the coil bobbin 32 and the frame 4. FIG. 13A is a bottom view of the back side in which the main part of the speaker device 1B shown in FIG. 11A is enlarged. FIG. 13B is a bottom view of the back side of the voice coil 31 and the yoke 21 shown in FIGS. 11A and 11B. FIG. 14 is a flowchart for explaining a method of manufacturing the speaker device 1B according to the third embodiment of the present invention shown in FIGS. 11 (A) to 11 (C). FIG. 15A is a bottom view of the back side in which the main part of the speaker device 1B shown in FIG. 11A and the jig G5 are enlarged, and FIG. 15B is a voice coil 31 of the speaker device 1B. FIG. 5 is a longitudinal sectional view for explaining the positional relationship between the yoke 21, and the jig G5. 16A is a cross-sectional view in the short direction for explaining the magnetic circuit 2B, the assembly 430, and the jig G3 of the speaker device 1B, and FIG. 16B is a magnetic circuit 2 and assembly of the speaker device 1B. It is sectional drawing of the transversal direction for demonstrating the positional relationship of 430 and the jig | tool G5. FIG. 17A is an enlarged bottom view of the main part of the speaker device 1C according to the fourth embodiment of the present invention. FIG. 17B is a bottom view of the back side of the voice coil and yoke shown in FIG. 18A is a perspective view of an outer magnet type magnetic circuit 2E of a speaker device according to another embodiment of the present invention, and FIG. 18B is an outer magnet of the speaker device according to another embodiment of the present invention. FIG. 19 is a perspective view of the magnetic circuit 2F, and is a cross-sectional view of the magnetic circuits 2E and 2F shown in FIGS. 18 (A) and 18 (B). FIG. 19 is a bottom view of an inner magnet type magnetic circuit 2H of a speaker device according to another embodiment of the present invention. 20A is a cross-sectional view of the yoke 21K of the speaker device according to the first specific example of the present invention, and FIG. 20B is a cross-sectional view of the yoke 21M according to the second specific example. ) Is a cross-sectional view of the yoke 21N according to the third specific example, and FIG. 20D is a cross-sectional view of the yoke 21P according to the fourth specific example of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker apparatus 2 Magnetic circuit 3 Vibrating body 4 Frame 21 Yoke 22 Magnet 23 Plate 31 Voice coil 32 Voice coil bobbin 33 Diaphragm 34 Edge (diaphragm support part)
35 Damper 211 Bottom surface 212 Side surface 213 Projection 231 Projection G3 Jig

A speaker device according to an embodiment of the present invention is joined to a diaphragm whose planar shape perpendicular to the vibration transmission direction of the vibration source has a longitudinal direction and a short direction, and the diaphragm directly or via a voice coil bobbin. In addition, a planar shape perpendicular to the vibration transmission direction is formed in an annular shape, and a voice coil having at least a linear portion along the longitudinal direction and a planar shape perpendicular to the vibration transmission direction that drives the voice coil are short in length and length. A magnetic circuit having a direction, and a frame that holds the magnetic circuit and supports the diaphragm so as to vibrate. The magnetic circuit includes a bottom surface having a shape having a longitudinal direction and a short direction, and a short surface of the bottom surface. A yoke provided with a side part having a magnetic gap only at an end part in the short side direction among an end part in the hand direction and an end part in the longitudinal direction, a magnet disposed on the bottom part of the yoke, and on the magnet Arrangement A linear magnetic gap is formed along the longitudinal direction between the plate and the yoke, and the voice coil is disposed in the magnetic gap of the magnetic circuit, and at the bottom of the yoke. The outer part or the inner central part that extends outward in the longitudinal direction from the longitudinal end part and that forms the magnetic gap has a protruding part that protrudes outward in the longitudinal direction from the longitudinal end part of the bottom surface part of the yoke. It is characterized by.
The vibration generation source corresponds to, for example, a voice coil or a diaphragm.

  In the above speaker device, the side surface portion of the yoke or the longitudinal end portion of the plate has a protruding portion that protrudes outward in the longitudinal direction from the longitudinal end portion of the yoke, and therefore leaks even near the longitudinal end portion of the magnetic circuit. The magnetic flux has a magnetic flux density, and when the speaker is driven, a Lorentz force is also generated at the longitudinal end portion of the voice coil, and the diaphragm can output a relatively large sound wave.

  In addition, a method for manufacturing a speaker device according to an embodiment of the present invention includes a first step of manufacturing an assembly by having each component of the speaker device having the above-described configuration, and joining a frame, a diaphragm, and a voice coil. When the assembly and the magnetic circuit are joined, the assembly and the magnetic circuit are positioned based on the side surface portion of the yoke or the protruding portion of the plate and the inner peripheral portion of the voice coil of the assembly. And a second step of joining the circuit.

In the manufacturing method of the speaker device, an assembly is manufactured by joining a frame, a diaphragm, and a voice coil in the first step, and a side surface portion of the yoke or a protruding portion of the plate and a voice of the assembly in the second step. Since the assembly and the magnetic circuit are positioned on the basis of the inner peripheral portion of the coil and the assembly and the magnetic circuit are joined, the speaker device can be manufactured relatively easily and with high accuracy. In particular, the speaker device manufacturing method can position the voice coil and the magnetic circuit with high accuracy.
In addition, the speaker device including the magnetic circuit in which the narrow magnetic gap is formed can be manufactured relatively easily and with high accuracy by the method for manufacturing the speaker device.
In the above speaker device, the magnetic circuit has a relatively narrow magnetic gap, and the voice coil is arranged with high precision in the magnetic gap, so that a sound wave of relatively high sound quality and high sound pressure can be output. it can.

  The speaker device according to an embodiment of the present invention is, for example, an acoustic device such as a television broadcast receiver speaker, a monitor speaker, an in-vehicle speaker, a mobile phone speaker, a headphone, a personal computer speaker, an audio device, and the like. Can be adopted.

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

[First Embodiment]
FIG. 1A is a plan view of the speaker device 1 according to the first embodiment of the present invention, and FIG. 1B is taken along line BB of the speaker device 1 shown in FIG. FIG. 1C is a cross-sectional view taken along line CC of the speaker device 1 shown in FIG. FIG. 2A is a cross-sectional view for explaining the tolerance of the plate thickness of the yoke 21, the tolerance and inclination of the yoke 21 during processing. FIG. 2B is a cross-sectional view for explaining tolerance and inclination during yoke processing.

  3A is a perspective view from the upper surface side of the magnetic circuit 2 of the speaker device 1 shown in FIGS. 1B and 1C. FIG. FIG. 3B is a perspective view from the back side of the magnetic circuit 2 of the speaker device 1 shown in FIGS. 1B and 1C. FIG. 3C is a perspective view from the back side of the diaphragm 33, the voice coil bobbin 32, and the frame 4 of the speaker device 1. FIG. 4A is a bottom view of the back surface side in which the main part of the speaker device 1 shown in FIG. FIG. 4B is a bottom view of the back side of the voice coil 31 and the yoke 21 shown in FIGS. 1A and 1B.

The speaker device 1 according to the first embodiment of the present invention includes a magnetic circuit 2, a vibrating body 3, and a frame 4, as shown in FIGS. 1 (A) to 1 (C).
As shown in FIG. 1A, when the speaker device 1 is viewed from the vibration direction (acoustic radiation direction SD), the diaphragm 33 has a longitudinal direction and a short direction. Specifically, the diaphragm 33 has a longitudinal shape and a transverse direction that are perpendicular to the vibration transmission direction of the vibration source (the diaphragm or the voice coil), for example, a track shape, an elliptical shape, an oval shape, It is formed in a rectangular shape or the like, and is formed in a track shape in the embodiment. The track-shaped diaphragm 33 is formed by a straight portion and a semicircular curved portion having a prescribed curvature.
The acoustic radiation direction SD corresponds to an embodiment of the vibration transmission direction of the vibration generating source (diaphragm or voice coil) according to the present invention.

[Magnetic circuit 2]
As shown in FIG. 1B, FIG. 1C, and FIG. 3A, the magnetic circuit 2 according to the present embodiment has a planar shape that is perpendicular to the vibration transmission direction of the vibration source and has a short length. Has a hand direction. In the magnetic circuit 2, a linear magnetic gap MG1 is formed along the longitudinal direction. A magnetic flux is formed in the magnetic gap MG1. In the magnetic circuit 2, the voice coil 31 is disposed in the magnetic gap MG1, and the voice coil 31 is driven. In the magnetic circuit 2 according to the present embodiment, the planar shape orthogonal to the vibration transmission direction of the vibration generating source is formed in an elongated shape (rectangular shape).

Specifically, the magnetic circuit 2 includes a yoke 21, a magnet 22, and a plate 23.
The plate 23 corresponds to an embodiment of the inner central portion constituting the magnetic gap according to the present invention.

The yoke 21 is made of, for example, a metal material such as iron. The yoke 21 has a longitudinal direction and a short direction. As shown in FIG. 3A, the yoke 21 according to the present embodiment is formed in an elongated shape (rectangular shape) in the longitudinal direction.
Specifically, the yoke 21 has a bottom surface portion 211 and a side surface portion 212. In the present embodiment, the bottom surface portion 211 and the side surface portion 212 are integrally formed. The yoke 21 has a cross-sectional shape in the short-side direction, including a bottom surface portion 211 and both side surface portions 212 substantially orthogonal to the bottom surface portion 211, three sides form an outer periphery, and a space is formed inside.

Specifically, the bottom surface portion 211 is formed in a shape having a longitudinal direction and a short direction, for example, is formed in a substantially rectangular shape, and the longitudinal direction is the same as the longitudinal direction of the diaphragm 33. Is formed.
The side part 212 is formed in the shape extended toward the acoustic radiation direction SD at the edge part of the short face direction of the bottom face part 211. As shown in FIG. Specifically, in the side surface portion 212, a magnetic gap is formed only at the short-side end portion of the short-side end portion and the long-side end portion of the bottom surface portion 211. In this embodiment, the side part 212 is formed in the both ends of a transversal direction. That is, the yoke 21 according to the present embodiment is formed in a substantially U-shaped cross-sectional shape in the short direction.
Further, the yoke 21 may not have a flat bottom surface portion 211, and the side surface portion 212 may be inclined with respect to the bottom surface portion 211 or may be bent. The yoke 21 only needs to include a bottom surface portion 211 and both side surface portions 212 that are substantially orthogonal to the bottom surface portion 211, and to have a space formed therein.

  The yoke 21 according to the present embodiment is formed into a U-shaped cross section by, for example, pressing an iron flat plate. For example, as shown in FIG. 2A, the outer dimension LA211 and the inner dimension LB211 vary depending on the tolerance of the plate thickness LC212, the tolerance of processing accuracy, and the like. Specifically, the outer dimension LA211 and the inner dimension LB211 of the yoke 21 are, as shown in FIG. 2B, the tolerance of the inclination of the side surface portion 212 of the yoke 21, more specifically, perpendicular to the bottom surface portion 211. Variation occurs with respect to the angle 90 due to the tolerance of the angle θ1 from the reference.

  In a general speaker device, the components of the speaker device are assembled at the time of manufacture based on the outer dimension and inner dimension of the yoke. However, since the outer and inner dimensions of the yoke have a relatively large tolerance, the assembly accuracy of the speaker device is relatively low. For this reason, it is necessary to form the magnetic gap of the magnetic circuit relatively wide.

  On the other hand, in the speaker device 1 according to this embodiment, even when the tolerances of the outer dimension LA211 and the inner dimension LB211 of the yoke 21 are relatively large, a plate protrusion (protrusion) 231 formed on the plate 23, as will be described later. Since the components of the speaker device 1 are assembled based on the above, the assembly accuracy is relatively high. In addition, since the speaker device 1 has a relatively high assembly accuracy, the magnetic gap of the magnetic circuit 2 can be defined to be relatively narrow.

The magnet 22 is disposed on the bottom surface portion 211 of the yoke 21. The magnet 22 has a long shape and a short direction in a planar shape perpendicular to the vibration transmission direction of the vibration source (vibration plate or voice coil). The magnet 22 according to the present embodiment has a rectangular planar shape, and the longitudinal direction is arranged along the longitudinal direction of the yoke 21. The magnet 22 is magnetized along the vibration direction of the diaphragm 33. The magnet 22 may be a permanent magnet such as neodymium, samarium / cobalt, alnico, rare earth, or ferrite.
As shown in FIG. 1B, the magnet 22 according to this embodiment has a length LY22 in the longitudinal direction substantially the same as a length LY21 in the longitudinal direction of the yoke 21. Further, the magnet 22 has a shorter length than the inner dimension of the yoke 21.

The plate 23 is disposed on the magnet 22. As for the plate 23, the planar shape orthogonal to the vibration transmission direction of a vibration generation source has a longitudinal direction and a transversal direction. The plate 23 according to the present embodiment is formed in a rectangular shape.
The height of the upper end of the plate 23 is defined to be substantially the same as the height of the upper end of the yoke 21. For example, the thickness of the plate 23 is substantially the same as the thickness of the yoke.
The plate 23 according to the present embodiment has a protruding portion 231. The protrusion 231 corresponds to an embodiment of the protrusion of the plate according to the present invention.
As shown in FIG. 1 (B), FIG. 3 (A), FIG. 3 (B), FIG. 4 (A), and FIG. 4 (B), the protruding portion 231 is when the speaker device 1 is viewed from the back side. The yoke 21 is formed in a shape protruding from the end in the longitudinal direction of the bottom surface portion 211 toward the outside in the longitudinal direction.

  The plate 23 according to this embodiment has a length LY23 in the longitudinal direction longer than the length LY22 in the longitudinal direction of the magnet 22 and the length LY21 in the longitudinal direction of the yoke 21. Specifically, as shown in FIG. 1B, the longitudinal end of the plate LY21 extends from the longitudinal end of the yoke 21 by a length LY230 toward the outside in the longitudinal direction. Yes. That is, the plate 23 is longer than the length LY21 in the longitudinal direction of the yoke 21 by twice the length LY230.

  The plate 23 according to the present embodiment is formed in a shape in which both end portions in the longitudinal direction protrude from the end portions of the yoke when viewed from the back side. The plate 23 is not limited to the above embodiment, and for example, the protruding portion 231 may be formed only at one end.

  In the present embodiment, the plate 23 is formed such that both ends in the longitudinal direction are longer than the both ends in the longitudinal direction of the yoke 21 by a length LY230 outward in the longitudinal direction. Specifically, the plate 23 has a length LY23 in the longitudinal direction longer than the length LY21 in the longitudinal direction of the yoke 21. The plate 23 has a length LY23 in the longitudinal direction longer than the length LY22 in the longitudinal direction of the magnet 22. The plate 23 has an end in the longitudinal direction positioned between the longitudinal end of the voice coil 31 and the longitudinal end of the bottom surface of the yoke 21.

In the magnetic circuit 2, a linear magnetic gap MG <b> 1 is formed along the longitudinal direction between the inner peripheral portion of the side surface portion 212 of the yoke 21 and the plate 23.
Further, in the magnetic circuit 2, the side surface portion 212 of the yoke 21 is formed at the short-side end portion of the bottom surface portion 211 of the yoke 21, and the magnetic gap MG <b> 1 is formed only at the short-side end portion.
Further, the magnetic circuit 2 has no side portion at the end in the longitudinal direction, and the yoke 21 has an opening at the end in the longitudinal direction.

  By the way, in a rectangular magnetic circuit of a general speaker device, the length in the longitudinal direction of the plate is formed to be the same as the length in the longitudinal direction of the yoke, and is near the longitudinal end of the voice coil. The magnetic flux density is relatively small.

  On the other hand, in the magnetic circuit 2 according to the embodiment of the present invention, since the plate 23 has the protruding portion 231, the magnetic flux density is also formed by the leakage magnetic flux in the vicinity of the end portion in the longitudinal direction. For this reason, the voice coil 31 has a large magnetic flux density in the vicinity of the end in the longitudinal direction due to the addition of leakage magnetic flux as compared with the general magnetic circuit. For this reason, the speaker device 1 according to the present embodiment can generate a Lorentz force near the longitudinal end of the voice coil 31 and output a sound wave having a relatively large sound pressure when the speaker is driven.

The protruding portion 231 of the plate 23 according to the present embodiment has a facing surface portion (side surface portion) 2310 that faces the linear portion 312 of the voice coil 31.
As will be described later, the positional relationship between the plate 23 and the voice coil 31 is defined based on the opposing surface portion (side surface portion) 2310 of the protruding portion 231 of the plate 23 and the second linear portion 312 of the voice coil 31. .

[Vibrating body 3]
The vibrating body 3 is supported by the frame 4 so as to vibrate. Specifically, the vibrating body 3 includes a voice coil 31, a voice coil bobbin (voice coil support part) 32, a diaphragm 33, an edge (diaphragm support part) 34, and a damper 35. The voice coil 31 corresponds to an embodiment of a voice coil according to the present invention, and the diaphragm 33 corresponds to an embodiment of a vibrating body according to the present invention.

The voice coil 31 is joined to the diaphragm 33 directly or via the voice coil bobbin 32. The voice coil 31 is formed in a cylindrical shape, and a planar shape viewed from the vibration direction, specifically, a planar shape orthogonal to the vibration transmission direction of the vibration source has a longitudinal direction and a short direction.
In addition, the voice coil 31 is formed in a track shape, an elliptical shape, an oval shape, a rectangular shape, or the like as viewed from the vibration direction. In this embodiment, the voice coil 31 is shown in FIGS. ), FIG. 3 (C), FIG. 4 (A), and FIG. 4 (B), the track shape is formed.

Specifically, as shown in FIGS. 4A and 4B, the voice coil 31 has a straight line part 310 and a curved line part 313.
The straight portion 310 is formed along the longitudinal direction. Further, the straight portion 310 of the voice coil 31 is formed in parallel along the longitudinal direction of the diaphragm 33. The straight portion 310 includes a first straight portion 311 and a second straight portion (positioning reference portion) 312.

The first linear portion 311 is disposed in the linear magnetic gap MG1 of the magnetic circuit 2.
As shown in FIG. 1B, FIG. 4A, and FIG. 4B, the second straight portion 312 is connected to the first straight portion 311, and the bottom straight portion 211 of the yoke 21 It extends outward from the longitudinal end. As shown in FIGS. 4A and 4B, the second linear portion 312 is arranged along the longitudinal direction so as to face the side surface portion of the protruding portion 231 of the voice coil 31. ing.

  As will be described later, when the assembly including the voice coil 31, the diaphragm 33, and the frame 4 and the magnetic circuit 2 are assembled, the second linear portion 312 includes the assembly (the inner peripheral portion of the voice coil 31) and the magnetic circuit. 2 (plate 23) is a reference for alignment.

The curved portion 313 is disposed outside the longitudinal end of the yoke 21 and is formed near the end of the voice coil 31. The curved portion 313 according to the present embodiment is formed in a semicircular shape.
The voice coil 31 may have a rectangular planar shape from the vibration direction. In this case, the curved portion 313 at the end in the longitudinal direction of the voice coil 31 extends in a direction perpendicular to the straight portion 310. It is formed in a straight line.

The voice coil bobbin (voice coil support portion) 32 is formed in a cylindrical shape, and a planar shape visually recognized from the vibration direction, specifically, a planar shape orthogonal to the vibration transmission direction of the vibration source has a longitudinal direction and a short direction. Have. The voice coil bobbin 32 according to the present embodiment is formed in a track shape as shown in FIG. The track shape includes two parallel straight portions and a substantially semicircular curved portion formed at the end of the straight portion. The voice coil bobbin 32 is made of, for example, a metal material such as aluminum, a resin, or the like.
The voice coil bobbin 32 has an upper end joined to the diaphragm 33, and the voice coil 31 is wound around the lower end.

  In the speaker device 1 according to the present embodiment, the voice coil 31 is joined to the diaphragm 33 via the voice coil bobbin 32, but is not limited to this form. For example, the voice coil 31 may be directly joined to the diaphragm 33.

The diaphragm 33 is supported by the frame 4 so as to be able to vibrate, vibrates when the speaker is driven, and emits sound waves in the acoustic radiation direction SD.
Specifically, the diaphragm 33 includes a first diaphragm (center portion) 331 and a second diaphragm (cone-shaped diaphragm) 332.

  As shown in FIGS. 1 (A) to 1 (C), the edge (diaphragm support portion) 34 is formed in an annular shape, and the radial cross-sectional shape is formed in a semicircular shape, a wave shape, etc. The outer peripheral portion is bonded and fixed to the frame 4 with an adhesive or the like, and the inner peripheral portion is joined to the outer peripheral portion of the diaphragm 33. The edge 34 and the diaphragm 33 may be integrally formed of the same material, for example.

  The damper 35 has one end joined to the voice coil 31 or the voice coil bobbin 32 and the other end joined to the frame 4, and supports the voice coil 31 so as to vibrate along the vibration direction. Restrict movement in other directions.

[Frame 4]
The frame 4 holds the magnetic circuit 2 and supports the diaphragm 33 so as to vibrate. For example, as shown in FIGS. 1 (A) to 1 (C), FIG. 3 (C), FIG. 4 (A), and FIG. Are formed in a shape that expands toward the acoustic radiation direction. Specifically, the frame 4 includes a fitted portion 40, a yoke upper end joint portion 41, a yoke side surface joint portion 42, a diaphragm end portion joining flat portion 43, and a yoke longitudinal direction end portion joining portion 425. The yoke upper end joint portion 41, the yoke side surface joint portion 42, the diaphragm end portion joint flat portion 43, and the yoke longitudinal direction end portion joint portion 425 are integrally formed of a material such as resin or metal.

The fitted portion 40 is formed on the back side of the frame 4 and the magnetic circuit 2 is fitted therein. Specifically, the yoke 21 of the magnetic circuit 2 is fitted into the fitted portion 40. The fitted portion 40 includes a yoke upper end joint portion 41, a yoke side surface joint portion 42, and a yoke longitudinal direction end portion joint portion 425.
The yoke upper end joint portion 41 is formed near the opening on the back side of the frame 4 and is joined to the yoke upper end joint portion 41 with an adhesive or the like.
All or part of the upper end portion of the yoke 21 may be joined to the yoke upper end joint portion 41 of the frame 4.

  The yoke side surface joining portion 42 is formed in the vicinity of the opening on the back surface side of the frame 4, protrudes toward the opposite side of the acoustic radiation direction SD, and is formed in an elongated shape along the longitudinal direction. The yoke side surface joining portion 42 is joined to the fitting surface 2125 of the outer peripheral portion of the side surface portion 212 of the yoke 21 with an adhesive or the like.

  As shown in FIG. 4 (A), the yoke longitudinal direction end joint portion 425 is formed in a shape bent from the longitudinal direction end portion of the yoke side surface joint portion 42 to the inner side in the short direction. The longitudinal end of the yoke is joined to the inner periphery of the yoke longitudinal end joint 425.

  In the present embodiment, a position adjusting gap is formed in advance between the yoke side surface joining portion 42 and the side surface portion of the yoke in a state where the frame 4 and the magnetic circuit 2 are fitted. After the positioning of the yoke 21 and the frame 4 at the time of manufacturing the speaker, an adhesive or the like is applied to a position adjusting gap formed between the frame 4 and the outer peripheral portion of the side surface of the yoke. 4 and the magnetic circuit 2 are bonded and fixed.

  The diaphragm end joint flat part 43 is formed in the vicinity of the upper end part of the frame 4, and the diaphragm 33 is joined directly or via the edge 34 so as to vibrate.

The opening 44 is formed at a substantially central portion on the back side of the frame 4. The magnetic circuit 2 is disposed near the opening 44.
In addition, a positioning jig is inserted into the opening 44 of the frame 4 from the back side of the speaker when the speaker device is manufactured.
The opening 44 of the frame 4 has a length in the longitudinal direction longer than the length in the longitudinal direction of the yoke. Further, the length of the opening 44 in the longitudinal direction is longer than the length of the plate 23 in the longitudinal direction. The opening 44 has a length in the longitudinal direction longer than the length of the voice coil 31 in the longitudinal direction. Further, the opening 44 of the frame 4 has a shorter length in the shorter direction than the length of the voice coil 31 in the shorter direction. That is, the opening 44 of the frame 4 is at least larger than the planar shape of the voice coil 31.

  The frame 4 is provided with a terminal portion 7. For example, as shown in FIG. 1B, the terminal portion 7 is provided on the back side of the frame 4 and is electrically connected to the voice coil 31 by a tinsel wire (conducting wire) 701. The terminal unit 7 is electrically connected to, for example, an audio signal processing circuit or an amplifier of an audio device.

[Speaker operation]
The operation of the speaker device 1 will be described.
For example, a signal current is input from the acoustic device to the terminal unit 7. The signal current is input from the terminal portion 7 to the voice coil 31 via the tinsel wire 701. A Lorentz force (driving force) corresponding to the signal current is generated in the voice coil 31, and the voice coil 31 vibrates along the vibration direction by the driving force. Further, the driving force is transmitted to the diaphragm 33 via the voice coil bobbin 32. The diaphragm 33 vibrates along the vibration direction by the driving force, and outputs a sound wave in the acoustic radiation direction (SD).

  For example, in a general rectangular magnetic circuit in which the protruding portion 231 is not formed at the longitudinal end of the plate 23, the magnetic flux density at the longitudinal end of the voice coil is relatively small. For this reason, the Lorentz force generated in the vicinity of the end in the longitudinal direction of the voice coil is relatively small.

  On the other hand, in the speaker device 1, since the longitudinal end portion of the plate 23 has the protruding portion 231 that protrudes outward in the longitudinal direction from the longitudinal end portion of the yoke, even in the vicinity of the longitudinal end portion of the magnetic circuit 2. It has a magnetic flux density due to leakage magnetic flux, and when the speaker is driven, Lorentz force is also generated at the longitudinal end of the voice coil 31, and the diaphragm 33 can output a relatively large sound wave.

[Manufacturing Method of Speaker Device 1]
FIG. 5 is a flowchart for explaining a method of manufacturing the speaker device 1 according to the first embodiment of the present invention shown in FIGS. 1 (A) to 1 (C).

  FIG. 6A is a cross-sectional view for explaining the assembling operation of the voice coil 31, the voice coil bobbin 32, the diaphragm 33, the edge 34, and the frame 4. FIG. 6B is a cross-sectional view for explaining the positioning operation of each component by the jig G1. Hereinafter, an operation in which the manufacturing apparatus (not shown) manufactures the speaker device will be described. The manufacturing apparatus includes, for example, a control circuit (CPU: Central Processing Unit), a memory, a driving device, and the like, and executes a program that shows the procedure of the manufacturing method of the speaker device according to the present invention, in which the control circuit is stored in the memory. Then, the speaker device 1 is manufactured by driving the driving device.

In step S1, as shown in FIGS. 6A and 6B, the voice coil 31, the voice coil bobbin 32, the diaphragm 33, the edge 34, and the frame 4 are assembled.
Specifically, first, as shown in FIG. 6A, the diaphragm 33, the voice coil 31, the voice coil bobbin 32, and the edge 34 are assembled in the preceding process so as to have a prescribed positional relationship (this The pre-process does not have to be performed, and each component may be assembled sequentially).

Next, the component G and the frame 4 are positioned by the jig G1.
The jig G1 includes a first protrusion G11 having an outer diameter substantially the same as the inner diameter of the voice coil 31 (voice coil bobbin 32), and a second protrusion G12 having an outer diameter substantially the same as the inner diameter of the yoke side surface joining portion 42 of the frame 4. And a recess G13 formed between the first protrusion G11 and the second protrusion G12.

As shown in FIG. 6B, the voice coil is applied to the first protrusion G11 of the jig G1 in a state where the second protrusion G12 of the jig G1 is fitted to the fitting part 40 of the frame 4. 31 (voice coil bobbin 32) is fitted. In this state, the outer peripheral portion of the diaphragm 33 is fixed to the diaphragm end joint flat portion 43 of the frame 4 through the edge 34 with an adhesive or the like. That is, the positional relationship among the voice coil 31, the voice coil bobbin 32, the diaphragm 33, the edge 34, and the frame 4 is defined. Thereafter, for example, after the adhesive is solidified, the jig G1 is removed from the frame 4.
By the step S1, the assembly 430 in which the frame 4, the diaphragm 33, the voice coil bobbin 32, and the voice coil 31 are joined is manufactured.

  FIG. 7A is a cross-sectional view for explaining a process of assembling the yoke 21, the magnet 22, and the plate 23. FIG. 7B is a cross-sectional view for explaining the positioning operation of each component by the jig G1.

  In step S2, the yoke 21, the magnet (before magnetization) 22, and the plate 23 are assembled. Specifically, for example, as shown in FIG. 7A, first, the magnet 22 and the plate 23 are assembled so as to have a specified positional relationship (pre-process).

Next, the assembly of the magnet 22 and the plate 23 and the yoke 21 are positioned by the jig G2.
7A and 7B, the jig G2 has a U-shaped cross section, has a recess G20, and an inner diameter G21 is the length of the magnet 23 in the short direction. The outer diameter G22 of the yoke 21 is substantially the same as the inner diameter of the yoke 21 along the short direction.

As shown in FIG. 7B, the jig G2 is fitted to the yoke 21 in a state where the plate 23 and the magnet 22 are fitted in the recess G20 of the jig G2. At this time, an adhesive is applied to the joint surface between the magnet 22 and the yoke 21 in advance. After the adhesive is solidified, the jig G2 is removed from the magnetic circuit 2.
For example, the magnet 22 is magnetized along the acoustic radiation direction (thickness direction) by the magnetizing device after the speaker device is assembled.
Steps S1 and S2 may be performed in reverse order or simultaneously.

  FIG. 8 is an enlarged bottom view of the main part of the speaker device 1 and the jig G3 shown in FIG. FIG. 9A is a cross-sectional view in the short direction for explaining the positional relationship between the voice coil 31, the plate 23, and the jig G <b> 3 of the speaker device 1. FIG. 9B is a longitudinal sectional view for explaining the positional relationship between the voice coil 31, the plate 23, and the jig G <b> 3 of the speaker device 1.

  Next, as shown in FIGS. 8, 9A, and 9B, when the assembly 430 and the magnetic circuit 2 are joined, the protruding portion 231 of the plate 23 of the magnetic circuit 2 and the assembly 430 The assembly 430 and the magnetic circuit 2 are positioned with reference to the inner peripheral portion of the voice coil 31 (voice coil bobbin 32), and the assembly 430 and the magnetic circuit 2 are joined.

Specifically, in step S3, as shown in FIGS. 8, 9A, and 9B, a speaker back surface portion is provided between the inner peripheral portion of the voice coil 31 and the protruding portion 231 of the plate 23. The jig G3 is inserted and the components are positioned.
For example, as shown in FIGS. 8, 9A, and 9B, the jig G3 includes an outer dimension of the plate 23 (opposite surface portion (side surface portion) 2310 of the protruding portion 231 of the plate 23) and a voice coil. It is inserted and inserted from the back surface side of the speaker between the inner dimensions of 31 (second linear portion 312 of voice coil 31). That is, the frame 4 has an opening 44 into which the jig G3 is inserted on the back side.
As shown in FIG. 8, the jig G <b> 3 according to the present embodiment has a substantially U-shaped planar shape, an outer peripheral surface (first contact surface) G <b> 301, and an inner peripheral surface (second contact). Surface) G302, and a concave inner bottom portion (third contact surface) G303.

The outer peripheral surface (first contact surface) G301 contacts the inner peripheral portion of the second linear portion 312 of the voice coil 31 (voice coil bobbin 32).
The inner peripheral surface (second contact surface) G302 contacts the opposing surface portion (side surface portion) 2310 of the protruding portion 231 of the plate 23.
The concave inner bottom portion (third abutting surface) G303 abuts on the end portion in the longitudinal direction of the protruding portion 231 of the plate 23.

  By inserting the jig G3 between the inner peripheral portion of the voice coil 31 and the protruding portion 231 of the plate 23, as shown in FIGS. 8, 9A, and 9A, The voice coil 31 and the plate 23 are positioned with high accuracy.

In step S4, for example, as shown in FIG. 9, the adhesive 902 is applied between the yoke 21 of the magnetic circuit 2 and the yoke upper end joint 41 and the yoke side surface joint 42 of the frame 4 by the adhesive application device 901. Applied. After the specified time, the adhesive is solidified, and the magnetic circuit 2 and the frame 4 are bonded and fixed.
Through steps S3 and S4, the voice coil 31 and the plate 23 are positioned with high accuracy, and the magnetic circuit 2 and the frame 4 are positioned and fixed with high accuracy.
After the adhesive is solidified and the magnetic circuit 2 and the frame 4 are bonded and fixed, the jig G3 is removed.

In step S5, for example, subsequent processes such as a process of joining the damper 35 to the voice coil bobbin 32 and the frame 4 and a process of magnetizing the magnet 22 by the magnetizing device are performed.
In step S6, various inspections such as an assembly check and an acoustic characteristic check are performed on the speaker device 1 manufactured in steps S1 to S5.

As described above, in the method of manufacturing the speaker device 1, the frame 4, the diaphragm 33, and the voice coil 31 (voice coil bobbin 32) are joined to produce the assembly 430, and then the plate of the magnetic circuit 2. 23, the assembly 430 and the magnetic circuit 2 are positioned on the basis of the projecting portion 231 of the assembly 23 and the inner peripheral portion of the voice coil 31 of the assembly 430, and the assembly 430 and the magnetic circuit 2 are joined. The speaker device 1 can be manufactured with high accuracy.
In particular, the method for manufacturing the speaker device 1 can position the voice coil 31 and the plate 23 with high accuracy.
That is, since the voice coil 31 and the plate 23 can be positioned with high accuracy, the magnetic gap MG1 of the magnetic circuit 2 can be defined to be relatively narrow. In the speaker device 1 according to the present invention, the magnetic circuit 2 has a relatively narrow magnetic gap, and the voice coil 33 and the magnetic circuit 2 are assembled with high accuracy. Can be provided.

  Further, in the magnetic circuit 2 according to the present invention, since the narrow magnetic gap MG1 is formed, a relatively large magnetic flux density is formed in the magnetic gap MG1, and a relatively large Lorentz force is applied to the voice coil 31 when the speaker is driven. Occurs. Therefore, the diaphragm 33 can output a sound wave having a relatively large sound pressure.

[Second Embodiment]
FIG. 10 is a back view of the main part of the speaker device and the jig GA3 according to the second embodiment of the present invention. The description of the same configuration as that of the first embodiment is omitted.

A method for manufacturing the speaker device according to the present embodiment will be described.
As shown in FIG. 10, the jig GA3 according to the present embodiment has an outer shape that corresponds to the shape in the vicinity of the end portion in the longitudinal direction of the voice coil 33. A contact portion GA305 is formed. The outer peripheral abutting portion GA305 is formed in a shape that abuts on the end portion of the voice coil 31 in the longitudinal direction.

  In the present embodiment, as shown in FIG. 10, the jig GA3 is inserted between the voice coil 31 and the protruding portion 231 of the plate 23 of the magnetic circuit 2, and the speaker device 1 is assembled. The longitudinal end of 31 and the longitudinal end of the magnetic circuit 2 (plate 23) are positioned with high accuracy, and the frame 4 and the magnetic circuit 2 can be bonded and fixed in this state.

[Third Embodiment]
FIG. 11 is a plan view of a speaker device 1B according to a third embodiment of the present invention, and FIG. 11B is a cross-sectional view taken along line BB of the speaker device 1B shown in FIG. FIG. 11C is a cross-sectional view taken along line CC of the speaker device 1B shown in FIG.
FIG. 12A is a perspective view from the upper surface side of the magnetic circuit 2B of the speaker device 1B shown in FIGS. 11B and 11C. FIG. 12B is a perspective view from the back side of the magnetic circuit 2B of the speaker device 1B shown in FIGS. 11B and 11C. FIG. 12C is a perspective view from the back side of the diaphragm 33, the voice coil bobbin 32, and the frame 4 of the speaker device 1B shown in FIG. FIG. 13A is a bottom view of the back surface side in which the main part of the speaker device 1B shown in FIG. 11A is enlarged. FIG. 13B is a bottom view of the back side of the voice coil 31 and the yoke 21 shown in FIGS. 11A and 11B. The description of the same configuration as that of the first embodiment is omitted.

As shown in FIGS. 11 (A) to 11 (C), FIGS. 12 (A) to 12 (C), and FIGS. 13 (A) to 13 (C), the speaker device 1B according to this embodiment is a magnetic circuit. 2, a vibrating body 3, and a frame 4.
The magnetic circuit 2 includes a yoke 21, a magnet 22, and a plate 23. The yoke 21 corresponds to an embodiment of the yoke according to the present invention.

As shown in FIG. 12A, the yoke 21 according to the present embodiment is formed in a substantially rectangular shape when viewed from the direction orthogonal to the vibration of the diaphragm, and is formed in an elongated shape in the longitudinal direction. The cross-sectional shape in the short direction is formed in a substantially U shape.
Specifically, the yoke 21 has a bottom surface portion 211, a side surface portion 212, and a protruding portion 213. Have In the present embodiment, the bottom surface portion 211, the side surface portion 212, and the protruding portion 213 are integrally formed.

  The side part 212 is formed in the shape extended toward the acoustic radiation direction SD at the edge part of the short face direction of the bottom face part 211. As shown in FIG. Specifically, the side surface portion 212 is formed only at the short-side end portion of the bottom-side portion 211 in the short-side end portion and the long-side end portion. In this embodiment, the side part 212 is formed in the both ends of a transversal direction. That is, the yoke 21 is formed in a substantially U-shaped cross-sectional shape in the short direction.

The protruding portion 213 is formed at the longitudinal end portion of the side surface portion 212, and has a shape projecting outward in the longitudinal direction from the longitudinal end portion of the bottom surface portion 211 of the yoke 21.
The protruding portion 213 of the side surface portion 212 of the yoke 21 has an end portion in the longitudinal direction located between the longitudinal end portion of the voice coil 31 and the longitudinal end portion of the bottom surface portion 211 of the yoke 21.

  The side surface portion 212 of the yoke 21 has a length LY2130 in the longitudinal direction longer than the length LY22 in the longitudinal direction of the magnet 22 and the length LY21 in the longitudinal direction of the bottom surface portion 211 of the yoke 21. Specifically, as shown in FIG. 11B, the side surface portion 212 of the yoke 21 has its longitudinal end directed outward in the longitudinal direction from the longitudinal end of the bottom surface portion 211 of the yoke 21. The length LY213 extends.

  The yoke 21 according to the present embodiment is formed in a shape in which both end portions in the longitudinal direction of the projecting portion 213 project from the end portion in the longitudinal direction of the bottom surface portion 211 of the yoke 21 when viewed from the back side. The protruding portion 213 is not limited to the above embodiment, and may be formed only at one end of the yoke side surface portion, for example.

Further, the protruding portion 213 has a facing surface portion (side surface portion) 2130 that faces the second linear portion 312 of the voice coil 31.
The positional relationship between the voice coil 31 and the magnetic circuit 2 is defined with reference to the opposing surface portion (side surface portion) 2130 of the protruding portion 213 of the yoke 213 and the second linear portion of the voice coil 31.

As shown in FIG. 12B, the yoke 213 according to this embodiment is formed by bending a flat iron plate so that the cross-sectional shape is substantially U-shaped, and then using a grinding machine or the like. The end portion in the longitudinal direction of the side surface portion of the yoke 21 is ground to form the cutout portion 217, whereby the protruding portion 213 is formed.
The manufacturing method of the yoke 21 is not restricted to the said form. For example, the yoke 21 may be manufactured by pressing a metal plate on which the notch 217 and the protrusion 213 are formed in advance.

  In the speaker device 1B according to this embodiment, even when the tolerances of the outer dimension LA211 and the inner dimension LB211 of the yoke 21 are relatively large, as will be described later, the opposing surface portion (side surface portion) 2130 of the protruding portion 213 of the yoke side surface portion 212. Since the components of the speaker device 1B are assembled based on the above, the assembly accuracy is relatively high. Further, since the speaker device 1B has a relatively high assembly accuracy, the magnetic gap of the magnetic circuit 2 can be defined to be relatively narrow.

  In the magnetic circuit 2 according to the present embodiment, since the side surface portion 212 of the yoke 21 has the protruding portion 213, a leakage magnetic flux is added near the end portion in the longitudinal direction, and a relatively large magnetic flux density is formed. For this reason, the voice coil 31 has a larger magnetic flux density in the vicinity of its longitudinal end than in a general magnetic circuit. For this reason, the speaker device 1B according to the present embodiment generates Lorentz force also in the vicinity of the longitudinal end portion of the voice coil 31 when the speaker is driven, and can output a sound wave having a relatively large sound pressure.

  The frame 4 has an opening 44 on the back side of the protrusion 213 of the side surface 212 of the yoke 21. The opening 44 functions as, for example, a pressure relief opening on the back side of the diaphragm, a jig insertion port when manufacturing the speaker, and the like.

FIG. 14 is a flowchart for explaining a method of manufacturing the speaker device 1B according to the third embodiment of the present invention shown in FIGS. 11 (A) to 11 (C).
FIG. 15A is a bottom view of the back side in which the main part of the speaker device 1B shown in FIG. 11A and the jig G5 are enlarged. FIG. 15B is a longitudinal sectional view for explaining the positional relationship between the voice coil 31, the yoke 21, and the jig G5 of the speaker device 1B. FIG. 16A is a cross-sectional view in the lateral direction for explaining the magnetic circuit 2B, the assembly 430, and the jig G5 of the speaker device 1B. FIG. 16B is a cross-sectional view in the short direction for explaining the positional relationship between the magnetic circuit 2, the assembly 430, and the jig G5 of the speaker device 1B. The description of the same operation as that of the first embodiment is omitted.

  After step S1 and step S2, when joining the assembly 430 and the magnetic circuit 2 in step S3A, the projecting portion 213 of the yoke 23 of the magnetic circuit 2 and the inner periphery of the voice coil 31 (voice coil bobbin 32) of the assembly 430 The assembly 430 and the magnetic circuit 2 are positioned with respect to each other, and the assembly 430 and the magnetic circuit 2 are joined.

Specifically, in step S3A, as shown in FIGS. 15 (A), 15 (B), 16 (A), and 16 (B), the inner peripheral portion of the voice coil 31 and the yoke side surface portion A jig G5 is inserted from the rear surface of the speaker between the projecting portion 213 and each component is positioned.
The jig G5 is, for example, between the inner dimension of the protruding part 213 of the yoke side surface part 212 (side surface part 2130 of the protruding part 213) and the inner dimension of the voice coil 31 (second linear part 312 of the voice coil 31). The speaker is inserted from the back side. That is, the frame 4 has an opening 44 into which the jig G5 is inserted on the back side.
The jig G5 according to the present embodiment has a substantially convex shape when viewed from the vibration direction of the diaphragm. The outermost peripheral surface (first contact surface) G51, the outer peripheral surface of the protruding portion (second Abutting surface) G52.

The outermost peripheral surface (first contact surface) G51 contacts the side surface portion 2130 of the protruding portion 213 of the yoke side surface portion 212.
The protrusion outer peripheral surface (second contact surface) G52 contacts the inner peripheral portion of the second linear portion 312 of the voice coil 31 (voice coil bobbin 32).

  The jig G5 is inserted between the side surface portion 2130 of the protruding portion 213 of the yoke side surface portion 212 and the inner peripheral portion of the voice coil 31, so that the jig G5 is inserted from the back surface of the speaker, The magnetic circuit 2B is positioned with high accuracy.

In step S4, for example, as shown in FIG. 16B, the adhesive is applied by the adhesive application device 901 to the yoke 21 of the magnetic circuit 2B, the yoke upper end joint portion 41, and the yoke side surface joint portion 42 of the frame 4. Applied between. After the specified time, the adhesive is solidified, and the magnetic circuit 2 and the frame 4 are bonded and fixed.
By the above steps S3A and S4, the yoke 21 and the voice coil 31 are positioned and fixed with high accuracy, and the magnetic circuit 2 and the frame 4 are positioned and fixed with high accuracy.
After the adhesive is solidified and the magnetic circuit 2 and the frame 4 are bonded and fixed, the jig G3 is removed.

  Steps S5 and S6 are the same as those in the first embodiment, and a description thereof will be omitted.

  As described above, the speaker device 1B according to the third embodiment of the present invention joins the frame 4, the diaphragm 33, and the voice coil 31 (voice coil bobbin 32) to produce the assembly 430. Since the assembly 430 and the magnetic circuit 2 are positioned based on the protrusion 213 of the side surface 212 of the yoke 21 and the inner peripheral portion of the voice coil 31 of the assembly 430, the assembly 430 and the magnetic circuit 2 are joined. The speaker device 1B can be manufactured relatively easily with high accuracy.

In particular, the method for manufacturing the speaker device 1B can position the voice coil 31 and the yoke 21 with high accuracy.
That is, since the voice coil 31 and the magnetic circuit 2 can be positioned with high accuracy, the magnetic gap MG1 of the magnetic circuit 2 can be defined to be relatively narrow. The speaker device 1B provides a relatively small speaker device 1B because the magnetic circuit 2 has a relatively narrow magnetic gap and the voice coil 33 and the magnetic circuit 2 are assembled with high accuracy. be able to.

[Fourth Embodiment]
FIG. 17A is a bottom view of the back side in which the main part of the speaker device 1C according to the fourth embodiment of the present invention is enlarged. FIG. 17B is a bottom view of the back side of the voice coil and yoke shown in FIG. The description of the same configuration as that of the first embodiment and the third embodiment is omitted.

A speaker device 1 </ b> C according to the present embodiment includes a magnetic circuit 2, a vibrating body 3, and a frame 4.
The magnetic circuit 2 includes a yoke 21, a magnet 22, and a plate 23.
The yoke 21 has the same configuration as the yoke of the speaker device 1 according to the third embodiment, and the plate 23 has the same configuration as the plate of the speaker device 1 according to the first embodiment.

  In the magnetic circuit 2 according to the present embodiment, since the side surface portion 212 of the yoke 21 has the protruding portion 213 and the plate 23 has the protruding portion 231, the magnetic gap is extended near the end portion in the longitudinal direction of the magnetic circuit 2. A magnetic flux density is formed. For this reason, the voice coil 31 has a larger magnetic flux density in the vicinity of its longitudinal end than in a general magnetic circuit. In addition, the speaker device 1C according to the present embodiment generates Lorentz force near the longitudinal end of the voice coil 31 when the speaker is driven, and can output a sound wave having a relatively large sound pressure.

  Further, when manufacturing the speaker device 1C, the side surface portion 212 of the yoke 21 is the protruding portion 213, the plate 23 is the protruding portion 231, and the second linear portion 312 of the voice coil 31 is used as a reference. The speaker device 1C can be manufactured with higher accuracy by positioning the circuit 2 with high accuracy and bonding and fixing.

As described above, the speaker device 1 according to the present invention includes the diaphragm 33 having a planar shape perpendicular to the vibration transmission direction of a vibration source (such as a diaphragm or a voice coil) having a longitudinal direction and a lateral direction. The voice coil 31 is joined to the diaphragm 33 directly or via the voice coil bobbin 32, and the plane shape orthogonal to the vibration transmission direction is formed in an annular shape, and has at least a linear portion along the longitudinal direction, and the voice coil 31 And a magnetic circuit 2 having a planar shape perpendicular to the vibration transmission direction having a longitudinal direction and a short direction, and a frame 4 that holds the magnetic circuit 2 and supports the diaphragm so as to vibrate. The magnetic circuit 2 includes a bottom surface portion 211 having a shape in which a plane shape orthogonal to a vibration transmission direction has a longitudinal direction and a short side direction, and a short side end and a short side end portion of the bottom surface portion 211. A yoke 21 having a side surface portion 212 having a magnetic gap MG1 only at an end portion in the hand direction, a magnet 22 disposed on the bottom surface portion 211 of the yoke 21, and a plate 23 disposed on the magnet 22 And a linear magnetic gap MG1 is formed between the plate 23 and the yoke 21 along the longitudinal direction. The voice coil 31 is disposed in the magnetic gap MG1 of the magnetic circuit 2 and extends outward in the longitudinal direction from the longitudinal end portion of the bottom surface portion 211 of the yoke 21. The plate 23 has a protruding portion 231 that protrudes outward in the longitudinal direction from the longitudinal end portion of the bottom surface portion 211 of the yoke 21, and thus has a leakage magnetic flux density near the longitudinal end portion of the magnetic circuit 2, When the speaker is driven, Lorentz force is also generated at the longitudinal end of the voice coil, and the diaphragm can output a relatively large sound wave.
Providing the protruding portion on the yoke side surface 21 also increases the magnetic gap. When the speaker is driven, a large Lorentz force is generated by the voice coil, and the diaphragm can output a relatively large sound wave.

In addition, the manufacturing method of the speaker device 1 according to the present invention includes each component of the speaker device 1 and manufactures the assembly 430 by joining the frame 4, the diaphragm 33, and the voice coil 31 (voice coil bobbin 32). And when the assembly 430 and the magnetic circuit 2 are joined, the assembly 430 and the magnetic circuit 2 are based on the protrusion 231 of the plate 23 of the magnetic circuit 2 and the inner periphery of the voice coil 31 of the assembly 430. And the step of joining the assembly 430 and the magnetic circuit 2 to each other, so that the speaker device 1 can be manufactured relatively easily with high accuracy.
In particular, the manufacturing method of the speaker device 1 is positioned on the basis of the outer dimension of the plate 23 and the inner dimension of the voice coil 33 at the time of final assembly. In addition, the speaker device 1 can be assembled and manufactured with high accuracy.
In addition, by providing the protruding portion 213 on the yoke side surface 21, the manufacturing method of the speaker device described above is based on the internal dimensions of the opposing surface portion of the protruding portion 213 of the yoke 21 and the internal dimensions of the voice coil 33 in the final assembly. Therefore, the speaker device can be assembled and manufactured with extremely high precision as compared with a general method for manufacturing a speaker device.

The present invention is not limited to the above embodiment. For example, you may combine each embodiment.
In the speaker device according to the above embodiment, the voice coil 31, the voice coil bobbin 32, the diaphragm 33, the frame 4 and the like are formed in a track shape as viewed from the vibration direction. However, the present invention is not limited to this form. For example, it may be formed in an elliptical shape, an oval shape, a rectangular shape, or the like.

The speaker device according to the present invention has the inner magnet type magnetic circuit, but is not limited to this form.
For example, the speaker device according to the present invention may have an external magnetic circuit as shown in FIGS. 18 (A) to 18 (C). Specifically, as shown in FIGS. 18A and 18B, the outer magnet type magnetic circuit 2E is disposed on the yoke 21E, the magnet 22E disposed on the yoke 21E, and the magnet 22E. It has a plate 23E. In this outer magnet type magnetic circuit 2E, the inner central portion constituting the magnetic gap, more specifically, the pole portion 215 of the yoke 21E protrudes outward in the longitudinal direction from the longitudinal end portion of the bottom surface portion 211E of the yoke 21E. It has a protrusion 2151E.
Further, as shown in FIGS. 18B and 18C, the external magnetic type magnetic circuit 2F includes a yoke 21F having a pole portion 215 and a bottom surface portion 211F, and a magnet disposed on the yoke 21F. 22E, and a plate 23F disposed on the magnet 22E. This outer magnet type magnetic circuit 2F has a protruding portion 231F in which an outer portion constituting a magnetic gap, specifically, a plate 23F protrudes outward in the longitudinal direction from the longitudinal end portion of the bottom surface portion 211F of the yoke 21F. .

  FIG. 19 is a bottom view of an inner magnet type magnetic circuit 2H of a speaker device according to another embodiment of the present invention. The magnetic circuit of the speaker device according to the present invention is not limited to the above-described embodiment. For example, as shown in FIG. 19, at the center of the longitudinal end portion 219 of the bottom surface portion 211H of the yoke 21H, On the other hand, a recess may be formed. That is, the magnetic circuit has a longitudinal direction and a short direction, and the plate 23 only has to protrude from the longitudinal end of the yoke bottom surface.

  Further, the magnetic circuit of the speaker device according to the present invention is not limited to the above embodiment, and for example, the yoke may be formed in a shape as shown in FIGS. 20 (A) to 20 (D). . Specifically, as shown in FIG. 20 (A), the yoke 21K may have a substantially U-shaped cross section, and as shown in FIG. 20 (B), the yoke 21M The upper end portion of the side surface portion may be formed in a shape bent toward the inside, or may be formed in a substantially V shape as shown in FIG. 20 (C). As shown in FIG. 4, the yoke 21P may have a central protrusion at the bottom. In other words, the yoke of the speaker device according to the present invention is only required to have a cross-sectional shape including a bottom surface portion and both side surface portions substantially orthogonal thereto, and a space is formed inside.

Claims (6)

A vibration plate having a longitudinal shape and a short side direction perpendicular to the vibration transmission direction of the vibration source;
A voice coil that is joined to the diaphragm directly or via a voice coil bobbin, has a planar shape orthogonal to the vibration transmission direction, and has at least a linear portion along the longitudinal direction;
A magnetic circuit for driving the voice coil, the planar shape orthogonal to the vibration transmission direction has a longitudinal direction and a transverse direction;
A frame that holds the magnetic circuit and supports the diaphragm so as to vibrate;
The magnetic circuit has a bottom portion having a shape having a longitudinal direction and a short side direction, and a magnetic gap only at an end portion in the short side direction among an end portion in the short side direction and an end portion in the longitudinal direction of the bottom surface portion. A yoke with a side portion;
A magnet disposed on the bottom surface of the yoke;
A plate disposed on the magnet,
A linear magnetic gap is formed along the longitudinal direction between the plate and the yoke,
The voice coil is disposed in the magnetic gap of the magnetic circuit and extends outward in the longitudinal direction from the longitudinal end of the bottom surface of the yoke.
The speaker device, wherein an outer portion or an inner central portion constituting the magnetic gap has a protruding portion that protrudes outward in the longitudinal direction from an end portion in the longitudinal direction of the bottom surface portion of the yoke. The voice coil has a first straight part disposed in a linear magnetic gap of the magnetic circuit, and a second straight part extending outward from the longitudinal end of the bottom surface of the yoke. ,
2. The speaker device according to claim 1, wherein the outer portion or the inner central portion constituting the magnetic gap has a facing surface portion in which the protruding portion faces the second linear portion of the voice coil.   The positional relationship between the voice coil and the magnetic circuit is defined with reference to the opposing surface portion of the outer or inner central portion of the magnetic gap and the second linear portion of the voice coil. The speaker device according to claim 2, wherein:   The outer part or the inner central part constituting the magnetic gap has its longitudinal end located between the longitudinal end of the voice coil and the longitudinal end of the bottom part of the yoke. The speaker device according to claim 2 or claim 3, wherein   5. The speaker device according to claim 4, wherein the frame has an opening at least on a back surface side of a protruding portion of an outer portion or an inner central portion constituting the magnetic gap. A planar shape perpendicular to the vibration transmission direction of the vibration source has a longitudinal direction and a short direction, and a planar shape joined to the diaphragm directly or via a voice coil bobbin and orthogonal to the vibration transmission direction Is formed in an annular shape and has at least a linear portion along the longitudinal direction, and a magnetic circuit that drives the voice coil and whose planar shape perpendicular to the vibration transmission direction has a longitudinal direction and a lateral direction, A method of manufacturing a speaker device having a frame that holds the magnetic circuit and supports the diaphragm so as to vibrate,
The magnetic circuit has a bottom portion having a shape having a longitudinal direction and a short side direction, and a magnetic gap only at an end portion in the short side direction among an end portion in the short side direction and an end portion in the longitudinal direction of the bottom surface portion. A yoke having a side surface, a magnet disposed on the bottom surface of the yoke, and a plate disposed on the magnet, and extending along the longitudinal direction between the plate and the yoke. A linear magnetic gap is formed, and the voice coil is disposed in the magnetic gap of the magnetic circuit and extends outward in the longitudinal direction from the longitudinal end of the bottom surface of the yoke. The outer part or the inner central part that constitutes has a protruding part that protrudes outward in the longitudinal direction from the end part in the longitudinal direction of the bottom surface part of the yoke,
A first step of joining the frame, the diaphragm and the voice coil to produce an assembly;
When the assembly and the magnetic circuit are joined, the assembly and the magnetic circuit, with reference to the outer or inner central portion of the magnetic gap and the inner periphery of the voice coil of the assembly. And a second step of joining the assembly and the magnetic circuit. A method of manufacturing a speaker device.

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