JP2010034989A - Speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight speaker system of high sound quality which has simple constitution and relatively large strength, to provide a heat-dissipating speaker system which has simple constitution, and so on. <P>SOLUTION: The speaker system 1 includes a magnetic circuit 2 having a yoke 21 having a bottom surface portion 211 and a side surface portion 212, a first magnet 22A and a second magnet 22B disposed on the bottom surface portion 211 of the yoke 21 apart from each other along the length direction, and a first plate 23A and a second plate 23B, a diaphragm 33, a frame 4 holding the magnetic circuit 2 and also supporting the diaphragm 33 in a vibratable state, a metallic voice coil bobbin 32 having its upper end portion bonded to the diaphragm 33 and having surfaces formed opposite each other along the width direction, a voice coil 31, and a metallic reinforcing member 6 disposed between the mutually opposite surfaces 324 of the voice coil bobbin 32 at right angles to the opposite surfaces 324, the reinforcing member 6 having a rib 61 which is sectioned in an uneven shape in a vibration direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker device.

  A speaker device including a diaphragm, a voice coil bobbin, and a voice coil is known (see, for example, Patent Document 1). The elongated voice coil (voice coil bobbin) is formed in a rectangular shape or a track shape, for example, and has two parallel straight portions. Since the voice coil (voice coil bobbin) has a relatively small pressing strength (or pulling strength) in a direction (short direction) perpendicular to the straight line portion, the voice coil (voice coil bobbin) is deformed when the speaker is driven. There is a risk that problems such as unstable vibration and abnormal noise may occur.

  The speaker device described in Patent Document 1 includes a thin plate-like connecting member on the inner periphery of a voice coil bobbin. This thin plate-like connecting member improves the strength of the voice coil.

Japanese Patent No. 3156538

  However, if the thin plate-like connecting member is simply provided on the voice coil bobbin, the voice coil bobbin may not have sufficient strength and may not be driven stably when the speaker is driven. For example, simply providing a thick connecting member on the voice coil bobbin may increase the weight of the vibrating body and reduce the sensitivity of the speaker. For this reason, a speaker device having a simple configuration and a relatively high strength of the voice coil bobbin is desired.

  Further, in a general speaker device, when the speaker is driven, the voice coil and the magnetic circuit generate heat, and the heat resistance may decrease. For this reason, a speaker device that can dissipate heat from a voice coil or a magnetic circuit with a simple configuration is desired.

  By the way, for example, in a speaker device having a structure in which a cap and a diaphragm are arranged on the upper part of the voice coil bobbin and the inside of the voice coil bobbin is sealed, when the speaker is driven, the vibration of the diaphragm is braked and the acoustic characteristics are deteriorated. There is.

  This invention makes it an example of a subject to cope with such a problem. That is, to provide a speaker device having a light voice coil bobbin having a relatively large strength with a simple configuration, to provide a lightweight and high-quality speaker device, and to provide a speaker device with high heat dissipation with a simple configuration This is the purpose of the present invention.

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 has a bottom surface having a shape having a longitudinal direction and a lateral direction, and is magnetic only at an end in the lateral direction among an end in the lateral direction and an end in the longitudinal direction of the bottom. A yoke having a side surface with a gap; first and second magnets spaced longitudinally on a bottom surface of the yoke; and longitudinally spaced on the first and second magnets A magnetic circuit having a first and a second plate arranged in a straight line, and a linear magnetic gap is formed along a longitudinal direction between the first and second plates and the yoke; A diaphragm whose planar shape perpendicular to the vibration transmission direction of the generation source has a longitudinal direction and a transverse direction, a frame that holds the magnetic circuit and supports the diaphragm so as to vibrate, and an upper end portion of the diaphragm on the diaphragm Planar shape joined and orthogonal to the vibration transmission direction Has a longitudinal direction and a short direction and a metal voice coil bobbin formed with surfaces facing each other in the short direction, a voice coil wound around the lower end of the voice coil bobbin, and the voice coil bobbin A metal made between the opposed surfaces and perpendicular to the opposed surfaces and disposed between the first and second plates of the magnetic circuit and between the first and second magnets. The reinforcing member has a rib having a concave-convex cross section in the vibration direction.

  A speaker device according to an embodiment of the present invention includes a bottom portion having a shape having a longitudinal direction and a short direction, and an end in the short direction among an end portion in the short direction and an end portion in the longitudinal direction of the bottom portion. A yoke having a side portion having a magnetic gap only at the portion, first and second magnets spaced apart in the longitudinal direction on the bottom surface portion of the yoke, and longitudinal direction on the first and second magnets A magnetic circuit having first and second plates disposed apart from each other, wherein a linear magnetic gap is formed along a longitudinal direction between the first and second plates and the yoke, and vibration A diaphragm having a plane shape perpendicular to the vibration transmission direction of the generation source having a longitudinal direction and a short direction, a frame that holds the magnetic circuit and supports the diaphragm so as to vibrate, and an upper end portion are joined to the diaphragm, The planar shape perpendicular to the vibration transmission direction is long and short. A metal voice coil bobbin having a direction and a surface facing each other in the short direction, a voice coil wound around a lower end portion of the voice coil bobbin, and a surface of the voice coil bobbin facing each other, A reinforcing member made of metal disposed at a right angle to the opposing surface and between the first and second plates of the magnetic circuit and between the first and second magnets. Is characterized by having ribs having a concave-convex cross section in the vibration direction.

In the speaker device, the metal property reinforcing member is disposed between the opposing surfaces of the voice coil bobbin of the magnetic circuit at right angles to the opposing surfaces, and the first and second plates of the magnetic circuit. Between the first and second magnets and having ribs with a concave-convex cross section in the vibration direction, for example, it has a relatively large strength in a direction perpendicular to the opposing surface of the voice coil bobbin.
For this reason, the above-described speaker device can output a high-quality sound wave by relatively stably vibrating a lightweight voice coil.
Moreover, since the said speaker apparatus is equipped with a metal voice coil, a metal reinforcement member, and metal ribs, it has comparatively high heat dissipation.

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 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 perspective view from the upper surface side of the magnet 22 and the plate 23 of the magnetic circuit 2 of the speaker device shown in FIGS. 1A to 1C. FIG. 2B is a perspective view from the upper surface side of the yoke 21 of the speaker device 1. FIG. 2C is a perspective view of the magnetic circuit 2 in which the yoke 21, the magnet 22 and the plate 23 shown in FIGS. 2A and 2B are combined.

  FIG. 3A is a perspective view from the back side (back side) of the magnetic circuit 2 of the speaker device 1 shown in FIG. FIG. 3B is a perspective view from the back side of the voice coil bobbin 32, the voice coil 31, the reinforcing member 6, and the frame 4 of the speaker device 1.

The speaker device 1 according to the present embodiment 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. 2A to FIG. 2C, the magnetic circuit 2 according to the present embodiment is a plane orthogonal to the vibration transmission direction of the vibration source. The shape has a longitudinal direction and a lateral 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 (pole piece) 23.
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 has a substantially rectangular planar shape perpendicular to the vibration transmission direction of the vibration source (diaphragm or voice coil), and is in the longitudinal direction. It is formed in an elongated shape, and the cross-sectional shape in the short direction is formed in a U shape. The yoke 21 has an opening at the end 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 bottom surface portion 211 according to the present embodiment has an opening 27 at a position corresponding to the back side of the reinforcing member 6 disposed in the magnetic gap MG1 of the magnetic circuit 2. For example, the opening 27 is formed in a rectangular shape that is elongated in the lateral direction (notch 218).

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.
Further, the side surface portion 212 has a side surface notch portion 219 formed at a position corresponding to the opening portion 27 of the bottom surface portion 211 of the yoke 21, for example.

  The yoke 21 according to the present embodiment is formed, for example, in a shape in which the opening 27 is opened from the bottom surface portion 211 to the substantially central portion of the side surface portion 212. Specifically, the opening 27 of the yoke 21 is formed by cutting the yoke 21 with a grinder or the like, for example, to form a notch 271. More specifically, the opening 27 of the yoke 21 is ground near the center of the bottom surface 211 of the yoke 21B by a grinding machine or the like to form the bottom notch 218, and further to the vicinity of the substantially center of the side surface 212. The side surface notch 219 is formed by grinding. The opening 27 of the yoke 21 according to the present embodiment is formed in a rectangular shape in the short direction.

  In addition, the side surface notch 219 of the side surface 212 of the yoke is, for example, a notch having a size that is at least equal to the thickness of the bottom surface of the yoke as shown in FIG. Is preferably formed.

  Further, when viewed from the short side, the yoke 21 is formed with a side surface notch portion 219 at the lower end portion of the side surface portion 212 and a continuous shape (connecting portion 2128) near the upper end portion of the side surface portion 212. ing.

  In the magnetic circuit 2, since the yoke 21 has the opening 27, when the speaker is driven, the opening 27 is a ventilation hole between the back surface side of the diaphragm 33 (first diaphragm (center part) 331) and the outside of the speaker. Function as. In the speaker device 1, since the yoke 21 has the opening 27, when the speaker is driven, air can be ventilated through the opening 27 to reduce fluctuations in the back pressure of the diaphragm, and braking of the diaphragm can be reduced. Can do. For this reason, the speaker device 1 has a relatively high sensitivity in the vicinity of the low-band resonance frequency (f0) when the speaker is driven.

  Further, as described later, since the opening 27 of the yoke 21 is formed on the back side of the reinforcing member 6 in the speaker device 1, the reinforcing member 6 vibrates when the speaker is driven, and the magnetic circuit 2 and the voice coil. 31, the heat of the voice coil bobbin 32 can be radiated to the outside with high efficiency.

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.
The magnet 22 according to the present embodiment has a plurality of magnets, and in the present embodiment, has two magnets (a first magnet 22A and a second magnet 22B).
The first magnet 22 </ b> A and the second magnet 22 </ b> B are arranged on the bottom surface portion 211 of the yoke 21 at a predetermined distance in the longitudinal direction. The reinforcing member 6 provided on the voice coil bobbin 32 is disposed in the gap between the first magnet 22A and the second magnet 22B.
A distance LY22 between the longitudinal end portions of the first magnet 22A and the second magnet 22B is substantially the same as the longitudinal length LY21 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.
Further, the plate 23 according to the present embodiment has a plurality of plates, and in the present embodiment, has two plates (a first plate 23A and a second plate 23B). The first plate 23A is disposed on the first magnet 22A, and the second plate 23B is disposed on the second magnet 22B. The first plate 23A and the second plate 23B are arranged apart from each other by a specified distance in the longitudinal direction. The reinforcing member 6 provided on the voice coil bobbin 32 is disposed in the gap (G3) between the plate 23A and the second plate 23B.
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.
In the first plate 23A and the second plate 23B according to this embodiment, the distance LY23 between both ends in the longitudinal direction is the distance LY22 between both ends in the longitudinal direction of the first and second magnets 22A and 22B and the yoke 21. Is the same as the length LY21 in the longitudinal direction.

The magnetic circuit 2 includes a linear magnetic gap MG1 along the longitudinal direction between the inner peripheral portion of the side surface portion 212 of the yoke 21 and the plate 23 (the first plate 23A and the second pole piece 23B). Is formed.
In the magnetic circuit 2 according to the present embodiment, the side surface portion 212 of the yoke 21 is formed at the end portion in the longitudinal direction of the bottom surface portion 211 of the yoke 21, but the side surface portion is formed at the end portion in the longitudinal direction. However, an opening is formed at the end in the longitudinal direction.

[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 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 orthogonal to the vibration transmission direction of a vibration generation source (a diaphragm or a voice coil) has a longitudinal direction and a short direction.
In addition, as shown in FIG. 1B, FIG. 1C, and FIG. 3B, the voice coil 31 has a track shape, an elliptical shape, an oval shape, a rectangular shape when viewed from the vibration direction. In this embodiment, it is formed in a track shape.

Specifically, the voice coil 31 has a straight line part and a curved line part.
The straight line portion is formed along the longitudinal direction. The straight portion of the voice coil 31 is formed in parallel along the longitudinal direction of the diaphragm 33. The straight line portion is disposed in the linear magnetic gap MG1 of the magnetic circuit 2.
The curved portion is disposed outside the longitudinal end portion of the yoke 21 and is formed near the longitudinal end portion of the voice coil 31. The curved portion 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 at the longitudinal end portion of the voice coil 31 is linear along the direction perpendicular to the straight portion. Formed.

The voice coil bobbin 32 is made of a metal material such as iron or aluminum, for example. This metal voice coil bobbin 32 has heat dissipation. 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.
The voice coil bobbin (voice coil support part) 32 is formed in a cylindrical shape, and the planar shape perpendicular to the vibration transmission direction of the vibration source (voice coil or diaphragm) has a longitudinal direction and a short direction. 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.
Further, as shown in FIG. 3C, the voice coil bobbin 32 has surfaces 324 that face each other in the lateral direction.

[Reinforcing member 6]
4A is a cross-sectional view of the voice coil 31, the voice coil bobbin 32, and the reinforcing member 6. FIG. FIG. 4B is a cross-sectional view of the reinforcing member 6A according to the first specific example of the present invention, and FIG. 4C is a cross-sectional view of the reinforcing member 6B according to the second specific example of the present invention.

The reinforcing member 6 is made of, for example, a metal material such as iron or aluminum. The metal reinforcing member 6 has a relatively high heat dissipation property.
Further, as shown in FIGS. 1B, 1C, 3B, and 4A, the reinforcing member 6 is disposed between the surfaces 324 of the voice coil bobbin 32 facing each other. It is a connecting member disposed at a right angle to the opposing surface 324. Further, the reinforcing member 6 according to the present embodiment is disposed between the first plate 23A and the second plate 23B of the magnetic circuit 2 and between the first magnet 22A and the second magnet 22B. Specifically, the reinforcing member 6 is formed at an intermediate portion in the longitudinal direction of the voice coil bobbin 32.

  The reinforcing member 6 has ribs 61 whose cross-sectional shape in the vibration direction is uneven. For example, various shapes can be adopted for the rib 61. For example, as shown in FIG. 4B, the reinforcing member 6 (6 </ b> A) according to the first specific example includes a rib 61 having a wavy cross section in the vibration direction. Further, as shown in FIG. 4C, the reinforcing member 6 (6B) according to the second specific example has ribs 61B whose cross-sectional shape in the vibration direction is substantially stepped or trapezoidal.

  Further, the voice coil bobbin 32, the reinforcing member 6, and the rib 61 may be formed of the same material. The speaker device 1 having this configuration has a relatively high heat dissipation and a relatively low manufacturing cost. In addition, each of the voice coil bobbin 32, the reinforcing member 6, and the rib 61 may be formed of a different material.

  Since the voice coil bobbin 32 has the reinforcing member 6 on which the rib 61 is formed, the voice coil bobbin 32 has a relatively large strength with respect to the short direction of the voice coil bobbin 32 and has a simple structure and is relatively lightweight. For this reason, the speaker device 1 can output high-quality sound waves from the diaphragm 33 when the light and high-strength voice coil bobbin 32 vibrates.

Further, as shown in FIG. 4A, the voice coil bobbin 32 according to the present embodiment has a bent portion 321 in which the lower end portion of the straight portion along the entire circumference or the longitudinal direction is bent outward in the radial direction. The voice coil 31 is disposed on the acoustic radiation side from the bent portion 321 of the voice coil bobbin 32.
That is, since the voice coil bobbin 32 has the bent portion 321, it has higher strength. Specifically, since the voice coil bobbin 32 is formed with the bent portion 321, the voice coil bobbin 32 has a relatively high strength even at a position away from the vicinity where the reinforcing member 6 is provided.

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), the frame 4 is formed in a shape in which an opening 44 is formed substantially on the back side of the central portion and is expanded toward the acoustic radiation direction. Yes. 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 joint flat portion 43, and a yoke longitudinal direction end portion joint portion. 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 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.

  The yoke longitudinal direction end joint portion is formed in a shape bent from the longitudinal direction end portion of the yoke side surface joint portion 42 in the lateral direction. A longitudinal end portion of the yoke is joined to an inner peripheral portion of the yoke longitudinal end joint portion.

  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.
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).

When the speaker device is driven, the metal reinforcing member 6 and the rib 61 provided on the voice coil bobbin 32 vibrate along the vibration direction, thereby radiating heat from the opening 27 of the magnetic circuit 2 with high efficiency. Do.
Since the speaker device 1 can air-cool the voice coil 32 with high efficiency when the speaker is driven, the input resistance (allowable input limit power value) is relatively high.

  In addition, since the speaker device 1 has the opening 27 of the magnetic circuit 2, it is possible to reduce fluctuations in the back pressure of the diaphragm 33, reduce braking on the diaphragm 33, and reduce the low-frequency resonance frequency. The sensitivity is relatively high near (f0).

[Second Embodiment]
FIG. 5A is a cross-sectional view of the speaker device 1C according to the second embodiment of the present invention. FIG. 5B is a perspective view from the back side of the voice coil bobbin 32, the voice coil 31, the reinforcing member 6, and the frame 4 of the speaker device 1C shown in FIG.
In the speaker device 1 </ b> C, the voice coil 31 may have a plurality of reinforcing members 6. The speaker device 1 </ b> C according to the present embodiment includes two reinforcing members 6 </ b> C and 6 </ b> D as illustrated in FIGS. 5A and 5B. The opening 27 of the magnetic circuit 2 is formed corresponding to the position of the reinforcing member 6.

  In the present embodiment, as shown in FIG. 5A and FIG. 5B, a plurality of gaps are provided between the first and second plates 23 of the magnetic circuit 2 and between the first and second magnets 22. Metal reinforcing members 6C and 6D are arranged.

  As shown in FIGS. 5 (A) and 5 (B), the speaker device 1C having the above-described configuration has a plurality of reinforcing members 6C and 6D, so that the speaker device according to the first embodiment, for example, In comparison, the voice coil bobbin 32 has higher strength.

As described above, the speaker device 1 includes the bottom surface portion 211 having a shape having a longitudinal direction and a short-side direction, and the short-side direction among the short-side end portion and the long-side end portion of the bottom-surface portion 211. A yoke 21 having a side surface 212 having a magnetic gap only at the end of the first magnet 22A, a first magnet 22A and a second magnet 22B which are disposed on the bottom surface 211 of the yoke 21 and spaced apart in the longitudinal direction; The first plate 23A and the second plate 23B are disposed on the first magnet 22A and the second magnet 22B so as to be separated from each other in the longitudinal direction, and the first plate 23A and the second plate 23B and the yoke 21 are provided. The planar shape perpendicular to the vibration transmission direction of the magnetic circuit 2 in which a linear magnetic gap G3 is formed along the longitudinal direction and the vibration generation source (diaphragm or voice coil) is the longitudinal direction and the short direction. And have The vibration plate 33, the frame 4 that holds the magnetic circuit 2 and supports the vibration plate 33 so as to vibrate, the upper end portion is joined to the vibration plate 33, and the planar shape perpendicular to the vibration transmission direction has a longitudinal direction and a short shape. A metal voice coil bobbin 32 having a direction and a surface facing each other in the short direction, a voice coil 31 wound around the lower end of the voice coil bobbin 32, and a surface 324 of the voice coil bobbin 32 facing each other Between the first plate 23A and the second plate 23B of the magnetic circuit 2 and between the first magnet 22A and the second magnet 22B. Since the reinforcing member 6 has ribs 61 having an uneven cross section in the vibration direction, the voice coil bobbin 32 is simplified. Is lightweight has a relatively large strength Do configuration.
The speaker device 1 can output high-quality sound waves because the voice coil bobbin 32 is light and stably vibrates when the speaker is driven.
Further, the speaker device 1 has a simple configuration of the voice coil bobbin 32 and has a relatively high heat dissipation property, and can radiate heat from the opening 27 of the magnetic circuit 2 with high efficiency.

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 has an inner magnet type magnetic circuit, but is not limited to this form. For example, the present invention may be applied to a speaker device having an external magnetic type magnetic circuit.

  For example, in the speaker device, a plurality of reinforcing members 6 are formed on the voice coil bobbin 32, and a plurality of magnets and plates are arranged on the yoke 21 at positions corresponding to the plurality of reinforcing members 6. The opening part may be formed in the position on the back side of each of the plurality of reinforcing members 6.

  FIG. 6 is a bottom view of an internal 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. 6, 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 may have a longitudinal direction and a short direction, and the pole piece 23 may protrude from the longitudinal end of the bottom surface of the yoke.

  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. 7 (A) to 7 (D). . Specifically, as shown in FIG. 7A, the yoke 21K may have a substantially U-shaped cross section, and as shown in FIG. 7B, the yoke 21M The upper end portion of the side surface portion may be formed in a shape that is bent inward, or may be formed in a substantially V shape as shown in FIG. As shown in FIG. 4, the yoke 21P may have a central protrusion on the bottom surface. 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.

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 perspective view from the upper surface side of the magnet 22 and the plate 23 of the magnetic circuit 2 of the speaker device shown in FIGS. 1A to 1C, and FIG. 2B is a speaker. It is a perspective view from the upper surface side of the yoke 21 of the apparatus 1, FIG.2 (C) is the magnetic which combined the yoke 21, the magnet 22, and the plate 23 which were shown to FIG. 2 (A) and FIG.2 (B). 3 is a perspective view of a circuit 2. FIG. 3A is a perspective view from the back side (back side) of the magnetic circuit 2 of the speaker device 1 shown in FIG. 2C, and FIG. 3B is a voice coil bobbin 32 of the speaker device 1. 3 is a perspective view from the back side of the voice coil 31, the reinforcing member 6, and the frame 4. FIG. 4A is a cross-sectional view of the voice coil 31, the voice coil bobbin 32, and the reinforcing member 6, and FIG. 4B is a cross-sectional view of the reinforcing member 6A according to the first specific example of the present invention. 4 (C) is a cross-sectional view of a reinforcing member 6B according to a second specific example of the present invention. 5A is a cross-sectional view of the speaker device 1C according to the second embodiment of the present invention, and FIG. 5B is a voice coil bobbin 32 and a voice coil 31 of the speaker device 1C shown in FIG. 5A. FIG. 6 is a perspective view from the back side of the reinforcing member 6 and the frame 4. FIG. 6 is a bottom view of an inner magnet type magnetic circuit 2H of a speaker device according to another embodiment of the present invention. 7A 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. 7B 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. 7D 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 6 Reinforcement member 21 Yoke 22 Magnet 23 Plate (pole piece)
27 Opening 31 Voice coil 32 Voice coil bobbin 33 Diaphragm 34 Edge (diaphragm support)
35 damper 61 rib 211 bottom surface 212 side surface

Claims (9)

A bottom surface portion having a shape having a longitudinal direction and a short side direction; and a side surface portion having a magnetic gap only at an end portion in the short side direction among end portions in the short side direction and the end portion in the longitudinal direction of the bottom surface portion. A yoke, first and second magnets spaced longitudinally on the bottom surface of the yoke, and first and second magnets spaced longitudinally on the first and second magnets A magnetic circuit having a linear magnetic gap formed along a longitudinal direction between the first and second plates and the yoke;
A vibration plate having a longitudinal shape and a short side direction perpendicular to the vibration transmission direction of the vibration source;
A frame that holds the magnetic circuit and supports the diaphragm so as to vibrate;
A metal voice coil bobbin having an upper end joined to the diaphragm, and a planar shape perpendicular to the vibration transmission direction has a longitudinal direction and a transverse direction, and surfaces facing each other in the transverse direction;
A voice coil wound around the lower end of the voice coil bobbin;
The voice coil bobbin is disposed between the opposed surfaces of the voice coil bobbin at a right angle to the opposed surfaces, and between the first and second plates of the magnetic circuit and between the first and second magnets. And a metal reinforcing member disposed in
The said reinforcement member has a rib with an uneven | corrugated shaped cross-sectional shape in a vibration direction.   2. The speaker device according to claim 1, wherein the bottom surface of the yoke has an opening at a position corresponding to the back side of the reinforcing member disposed in the magnetic gap of the magnetic circuit.   The speaker device according to claim 2, wherein the yoke has a shape in which the opening is opened from the bottom surface portion to a substantially central portion of the side surface portion.   The speaker device according to claim 3, wherein the yoke has the opening cut out in a rectangular shape elongated in a short direction. The voice coil bobbin has a bent portion in which a lower end portion of a linear portion along the entire circumference or the longitudinal direction is bent outward in the radial direction,
5. The speaker device according to claim 1, wherein the voice coil is disposed on an acoustic radiation side with respect to the bent portion of the voice coil bobbin. 6.   The voice coil has a planar shape perpendicular to the vibration transmission direction formed into a track shape, and a linear portion disposed in a magnetic gap of the magnetic circuit and a longitudinal outer side of a longitudinal end portion of a bottom surface portion of the yoke. The speaker device according to any one of claims 1 to 5, further comprising a substantially semicircular curved portion formed at an end portion extending in a longitudinal direction.   The speaker device according to any one of claims 1 to 6, wherein the voice coil bobbin, the reinforcing member, and the rib are formed of the same material.   The speaker device according to any one of claims 1 to 7, wherein the reinforcing member is formed at an intermediate portion in a longitudinal direction of the voice coil bobbin.   2. A plurality of metal reinforcing members are disposed between the first and second plates of the magnetic circuit and between the first and second magnets. 8. The speaker device according to any one of 8.

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