JP2010034988A - Speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce resonance between a domed diaphragm and a pole with relatively simple constitution, to provide a compact speaker system of high sound quality, and to maintain the shape of the domes-shaped diaphragm even when external force is applied to the domed diaphragm. <P>SOLUTION: The speaker system 1 includes a magnetic circuit 2 having a magnet 22 and a pole portion, the domed diaphragm 33, a frame 4 supporting the domed diaphragm 33 in a vibratable state, a voice coil 31 bonded to the domed diaphragm 33 directly or across the voice coil 32, and disposed in a magnetic gap MG1 of the magnetic circuit 2, and a domed braking member 5 disposed between the domed diaphragm 33 and pole portion closely to the domed diaphragm 33, the braking member has an upper air vent 51 and a lower-end air vent 52 communicating with the inner side of the damping member 5, and a sound absorbing member 6 disposed in the damping member 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker device.

  A speaker device (also referred to as a dome speaker) including a dome-shaped diaphragm and a magnetic circuit is known. In a general dome speaker, resonance occurs between the pole of the yoke of the magnetic circuit and the dome-shaped diaphragm, and the acoustic frequency characteristics may not be good.

  A dome speaker having a magnetic circuit including a yoke having a pole portion, a magnet, and a top plate and having a sound absorbing material disposed on a crucible pole portion is known (for example, see Patent Document 1). .

Sho 62-196499

However, the dome speaker described in Patent Document 1 reduces the resonance between the pole and the diaphragm by the sound absorbing material provided in the yoke, but the resonance may not be sufficiently reduced, and the acoustic characteristics are not sufficient. The frequency characteristics of the low sound range may not be good.
Moreover, since the dome speaker described in Patent Document 1 includes a pot-shaped yoke, it is relatively difficult to reduce the size. For this reason, a small speaker device with a relatively simple configuration and high sound quality is desired.

  By the way, in a general dome speaker, since the dome-shaped diaphragm has a relatively small strength, for example, when an external force is applied to the diaphragm, the dome-shaped diaphragm is deformed to form a recess, and the acoustic frequency characteristics are lowered. There is a risk of doing.

  This invention makes it an example of a subject to cope with such a problem. That is, with a relatively simple configuration, reducing the resonance between the dome-shaped diaphragm and the pole, providing a small speaker device with high sound quality, even when an external force is applied to the dome-shaped diaphragm, It is an object of the present invention that the shape of the diaphragm can be maintained.

In order to achieve such an object, the present invention includes at least a configuration according to the following independent claims.
A speaker device according to the present invention includes a magnetic circuit including a magnet and a pole portion, a dome-shaped diaphragm, a frame that supports the dome-shaped diaphragm so as to vibrate, and the dome-shaped diaphragm directly or via a voice coil bobbin. And a dome-shaped braking member disposed between the dome-shaped diaphragm and the voice coil disposed in the magnetic gap of the magnetic circuit, and disposed between the dome-shaped diaphragm and the pole portion. The brake member has a vent hole that communicates with the inside of the brake member, and a sound absorbing member that is disposed inside the brake member.

  A speaker device according to an embodiment of the present invention includes a magnetic circuit including a magnet and a pole portion, a dome-shaped diaphragm, a frame that supports the dome-shaped diaphragm so as to vibrate, and a direct or voice coil bobbin on the dome-shaped diaphragm. And a voice coil disposed in the magnetic gap of the magnetic circuit, and a dome-shaped braking member disposed between the dome-shaped diaphragm and the pole portion and in proximity to the dome-shaped diaphragm. And the braking member has a vent hole communicating with the inside of the braking member, and a sound absorbing member disposed inside the braking member.

  In the speaker device, the braking member is disposed between the dome-shaped diaphragm and the pole portion of the magnetic circuit, and includes a vent hole that communicates with the inside of the braking member, and a sound absorbing member that is disposed inside the braking member. Therefore, the resonance between the diaphragm and the yoke pole can be reduced with a relatively simple configuration.

  Further, compared with a speaker device having a special structure such as a crucible yoke provided with a sound absorbing material, for example, the speaker device according to the present invention includes the above-described braking member, and thus has a relatively simple configuration, high sound quality, and small size. Can be formed.

  In the speaker device, since the dome-shaped braking member is close between the dome-shaped diaphragm and the pole portion of the magnetic circuit, even when an external force is applied to the dome-shaped diaphragm, for example, The deformation of the dome-shaped diaphragm is restricted so that the diaphragm is restored to its original shape, and the dome shape can be maintained.

  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. In addition, the speaker device according to the embodiment of the present invention can be employed in, for example, a high-pitched sound reproduction speaker (tweeter).

  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. FIG. 1B is a cross-sectional view taken along line B-B of the speaker device 1 shown in FIG. FIG. 2 is an exploded cross-sectional view of the speaker device 1 shown in FIG.
3A is a top view of the braking member 5 shown in FIG. 1B, and FIG. 3B is a rear view of the braking member 5 shown in FIG. 3A. FIG. 4 is a top view of the sound absorbing member 6 shown in FIG.

The speaker device 1 includes a magnetic circuit 2, a vibrating body 3, a frame 4, and a braking member 5. The magnetic circuit 2 corresponds to an embodiment of the magnetic circuit according to the present invention. The braking member 5 corresponds to an embodiment of the braking member according to the present invention.
The speaker device 1 according to the present embodiment is formed in a circular shape as shown in FIG. 1 (A), and each component is formed in a concentric shape. The speaker device 1 is not limited to the above-described form, and may be formed in various shapes such as a rectangular shape, a track shape, and an elliptical shape, for example.

  As the magnetic circuit 2, an inner magnet type magnetic circuit, an outer magnet type magnetic circuit, or the like can be adopted. As the magnetic circuit 2 according to the present embodiment, an internal magnet type magnetic circuit is employed.

  Specifically, the magnetic circuit 2 includes a yoke 21, a magnet 22, and a plate 23 (pole portion). The plate 23 corresponds to an embodiment of the pole portion according to the present invention.

  The yoke 21 is made of, for example, a metal material such as iron. As shown in FIG. 1B, the yoke 21 according to the present embodiment includes a bottom surface portion 211, a side surface portion 212 having a shape bent in an acoustic radiation direction (SD) from an end portion of the bottom surface portion 211, and a yoke upper end. And a flat portion 213 formed in the vicinity of the portion. The bottom surface portion 211, the side surface portion 212, and the flat portion 213 are integrally formed.

  The magnet 22 according to the present embodiment is disposed on the bottom surface portion 211 of the yoke 21 as shown in FIG. The magnet 22 according to the present embodiment is formed in a circular plate shape and is magnetized along the thickness direction. As the magnet 22, for example, a neodymium-based, samarium-cobalt-based, alnico-based, rare-earth-based, or ferrite-based permanent magnet can be employed.

The plate 23 is made of, for example, a metal material such as iron and has a flat plate shape. The plate 23 is disposed on the magnet 22. For example, the plate 23 according to the present embodiment is defined such that the height of its upper end is substantially the same as the height of the upper end of the yoke 21. Further, the plate 23 according to the present embodiment corresponds to a pole portion of the inner magnet type magnetic circuit 2.
Moreover, the braking member 5 is arrange | positioned at the upper part of the plate 23 so that it may mention later. As shown in FIG. 1B, the plate 23 has a fitted portion 231 into which the support portion 53 of the braking member 5 is fitted. The fitted portion 231 according to the present embodiment is formed in a hole shape in the central portion of the plate 23 as shown in FIG. Further, the plate 23 may be formed in an annular shape as shown in FIG.

  In the magnetic circuit 2, a magnetic gap MG <b> 1 is formed between the plate 23 and the side surface portion 212 of the yoke 21. The magnetic gap MG1 according to the present embodiment is formed in a substantially cylindrical shape.

The vibrating body 3 is supported by the frame 4 so as to vibrate. The vibrating body 3 is driven by the magnetic circuit 2.
As shown in FIG. 1A, FIG. 1B, and FIG. 2, the vibrating body 3 includes, in detail, a voice coil 31, a voice coil bobbin (voice coil support portion) 32, a diaphragm 33, and an edge ( (Diaphragm support part) 34. The diaphragm 33 corresponds to an embodiment of a dome-shaped diaphragm according to the present invention.

The voice coil 31 is joined to the diaphragm 33 directly or via the voice coil bobbin 32 and is disposed in the magnetic gap MG1 of the magnetic circuit.
The voice coil bobbin (voice coil support part) 32 according to the present embodiment has an upper end joined to the diaphragm 33 and a voice coil 31 arranged at the lower end. The lower end portion of the voice coil bobbin 32 is arranged up to the vicinity of the lower end portion of the plate 23.

As shown in FIGS. 1A, 1B, and 2, the diaphragm 33 is formed in a dome shape and is disposed so as to cover the voice coil 31 and the voice coil bobbin 32. Is supported by the frame 4 via the edge 34.
Further, as a material for forming the diaphragm 33, various materials such as metal materials such as aluminum, beryllium, and titanium, resin, paper, and cloth can be employed.

The edge (diaphragm support part) 34 is formed in an annular shape, the inner peripheral part is joined to the diaphragm 33, the outer peripheral part is joined to the frame 4, and the radial cross-sectional shape is, for example, a concave shape, a convex shape, a cone shape, etc. Is formed.
The edge 34 and the diaphragm 33 may be separate members, or the edge 34 and the diaphragm 33 may be integrally formed of the same material.

  The frame 4 supports the diaphragm 33 so as to vibrate. As shown in FIGS. 1B and 2, the frame 4 according to the present embodiment is formed in a substantially cylindrical shape and supports the magnetic circuit 2 and the vibrating body 3. The frame 4 is disposed on the flat portion 213 of the yoke 21 of the magnetic circuit 2 directly or via an intermediate member (packing) 402.

  The terminal part 7 is provided in the outer peripheral part of the magnetic circuit 2, the frame 4, etc., for example. The terminal portion 7 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.

The braking member 5 is disposed between the diaphragm 33 and the pole portion (plate 23) of the magnetic circuit 2. Further, the braking member 5 according to the present embodiment is formed in an outer shape (dome shape) corresponding to the inner peripheral shape of the dome-shaped diaphragm 33, and the inside is formed hollow. The braking member 5 brakes the vibration of the diaphragm 33 when the speaker is driven. The braking member 5 is formed of, for example, a metal material, resin, etc., and has a relatively high rigidity.
For example, even when an external force is applied to the dome-shaped diaphragm, the deformation of the diaphragm 33 is small because the dome-shaped braking member 5 is close to the diaphragm 33 so that the deformation of the diaphragm 33 is small. Thus, the diaphragm 33 can be restored to its original shape and the dome shape can be maintained.

  Specifically, the braking member 5 includes a dome-shaped portion 50, an upper vent hole (vent hole) 51, a lower end vent hole (vent hole) 52, a support portion 53, and a sound absorbing member 6. In the braking member 5 according to this embodiment, the dome-shaped portion 50 and the support portion 53 are integrally formed of a forming material such as resin or metal. In the braking member 5, the dome-shaped portion 50 and the support portion 53 may be formed of different materials.

The upper ventilation hole 51 is formed so as to communicate with the inside (hollow part) of the braking member 5. The braking member 5 may have a plurality of upper ventilation holes 51 formed therein.
The upper ventilation hole 51 according to the present embodiment is formed near the upper portion of the braking member 5 as shown in FIG. In the present embodiment, as shown in FIGS. 1B, 3A, and 3B, a plurality of upper ventilation holes 51 are formed near the upper portion of the braking member 5. Specifically, in the braking member 5, a columnar support portion 53 is joined to the upper central portion of the dome-shaped portion 50 of the braking member 5. The braking member 5 is formed with a plurality of arc-shaped upper vent holes 51 with a specified radius from the upper end portion and at a specified interval along the circumferential direction.

The vent hole 52 is formed between the braking member 5 and the pole portion (plate 23) or near the lower end portion of the braking member 5. The vent hole 52 is formed in a shape that communicates with the inside (hollow portion) of the braking member 5.
As shown in FIG. 1B and FIG. 3B, the braking member 5 according to the present embodiment has a plurality of air holes that are spaced apart from each other at a specified interval along the circumferential direction at the lower end portion of the dome-shaped portion 50. 52 is formed.
The vent hole 52 is not limited to the above form, and may be formed in the vicinity of the center of the side surface of the dome-shaped portion 50, for example.

  The support portion 53 is disposed on the pole portion of the magnetic circuit 2 and supports the dome-shaped portion 50. The support portion 53 according to the present embodiment is formed in a columnar shape, the upper end portion is joined to the upper inner peripheral portion of the dome-shaped portion 50, and the lower end portion is formed on the pole portion (plate 23) of the magnetic circuit 2. A fitting portion 531 that fits into the fitting portion 231 is formed.

The sound absorbing member 6 is disposed inside the braking member 5 (hollow part). Specifically, as shown in FIG. 1 (B), the sound absorbing member 6 is disposed inside the braking member 5 (hollow portion), and has an upper vent hole (vent hole) 51 and a lower end vent hole (vent hole). ) 52.
Specifically, as shown in FIG. 4, the sound absorbing member 6 is formed in an annular shape, and a hole 601 is formed in the center. The sound absorbing member 6 has a hole 601 fitted into the support portion 53 and is disposed between the inner side surface portion of the dome-shaped portion 50 of the braking member 5 and the support portion 53.
The sound absorbing member 6 is formed of a porous material such as sponge, for example, and has air permeability. Specifically, the sound absorbing member 6 has air permeability to the extent that braking is applied to the vibration of the diaphragm 33 when the speaker is driven, for example.

  The speaker device 1 has an upper ventilation hole 51 of the braking member 5, a breathable sound absorbing member 6 disposed inside (hollow part) of the braking member 5, and a ventilation path 81 that passes through the lower end ventilation hole 52. When the speaker is driven, air enters and exits through the ventilation path 81 between the upper ventilation hole 51 and the lower ventilation hole 52 of the braking member 5 via the sound absorbing member 6 according to the vibration of the diaphragm 33.

  As shown in FIG. 1B, the dome-shaped diaphragm 33 and the dome-shaped braking member 5 are close to each other. A ventilation path 82 is formed between the outer surface of the braking member 5 and the diaphragm 33.

In addition, the shape and size of the upper vent 51, the shape and size of the lower end vent 52, the degree of air permeability of the sound absorbing member 6, and the like are defined according to the performance of the speaker device.
For example, when the speaker device 1 has a relatively small upper ventilation hole 51, a lower end ventilation hole 52, and a relatively small air-permeable sound absorbing member 6, a relatively large braking force acts on the diaphragm 33 when the speaker is driven. To do.
Further, for example, when the speaker device 1 has a relatively large upper vent 51 and lower end vent 52 and a relatively large breathable sound absorbing member 6, a relatively small braking force is applied to the diaphragm 33 when the speaker is driven. Works.

[Operation of Speaker Device 1]
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 is driven, air enters and exits the speaker device 1 through the ventilation path 81 between the upper ventilation hole 51 and the lower ventilation hole 52 of the braking member 5 according to the vibration of the diaphragm 33. Since the speaker device 1 according to the present embodiment includes the braking member 5 including the relatively small upper vent 51 and the lower end vent 52, the braking performance is relatively high against the vibration of the diaphragm 33 when the speaker is driven. Have
In the speaker device 1, since the braking member 5 includes the sound absorbing member 6 inside (hollow part), the speaker device 1 has higher braking performance against vibration of the diaphragm 33 when the speaker is driven.

By the way, a general dome speaker has a relatively large peak dip at a high frequency of acoustic frequency characteristics due to resonance between the diaphragm and the pole portion.
On the other hand, since the speaker device 1 according to the present invention includes the braking member 5, when the speaker is driven, the sound absorbing member 6 absorbs sound (air flow) while the sound pressure on the back surface side (back surface side) of the diaphragm is relatively high. The magnitude of the vibration can be regulated to a certain value or less), and has high braking performance against the vibration of the diaphragm 33. For this reason, the speaker device 1 has a relatively flat acoustic frequency characteristic. That is, since the speaker device 1 includes the braking member 5 between the diaphragm and the pole portion of the magnetic circuit, the speaker device 1 can output a relatively small and high-quality sound wave.
Further, since the speaker device 1 includes the braking member 5, the shape of the dome-shaped diaphragm 33 can be maintained even when an external force is applied to the dome-shaped diaphragm 33.

[Second Embodiment]
FIG. 5 is a cross-sectional view of the speaker device 1B according to the second embodiment of the present invention. The description of the same configuration as that of the first embodiment is omitted.
As shown in FIG. 5, the speaker device 1B according to the present embodiment includes an outer magnet type magnetic circuit 2B.
The magnetic circuit 2B includes a yoke 21B, an annular magnet 22B, and an annular plate 23B. The yoke 21 </ b> B has a pole portion 2101 formed at the center, and a fitting portion 531 of the support portion 53 of the braking member 5 is fitted to a fitted portion formed on the pole portion 2101.

  The speaker device 1B has an external magnetic type magnetic circuit 2B, and the braking member 5 is disposed between the pole portion of the magnetic circuit 2B and the diaphragm 33. Therefore, the resonance between the diaphragm and the pole is generated. Therefore, it is possible to output a sound wave having a high sound quality and a relatively large amplitude.

As described above, the speaker device 1 includes the magnetic circuit 2 including the magnet 22 and the pole portion, the dome-shaped diaphragm 33, the frame 4 that supports the dome-shaped diaphragm 33 so as to vibrate, and the dome-shaped diaphragm. 33, directly or via a voice coil bobbin 32, and disposed between the voice coil 31 disposed in the magnetic gap MG1 of the magnetic circuit 2, the dome-shaped diaphragm 33 and the pole portion, and the dome-shaped diaphragm. 33, a dome-shaped braking member 5 close to 33, and the braking member includes an upper ventilation hole 51 communicating with the inside of the braking member 5, a lower end ventilation hole 52, and a sound absorbing member disposed inside the braking member 5. Since the member 6 is provided, the resonance between the diaphragm 33 and the pole portion can be reduced with a relatively simple configuration.
In addition, a small speaker device 1 with high sound quality can be provided.
Further, the speaker device 1 can maintain the shape of the dome-shaped diaphragm 33 even when an external force is applied to the dome-shaped diaphragm 33.

The present invention is not limited to the above embodiment. For example, you may combine each embodiment.
In addition, the speaker device 1 according to the above embodiment is formed in a circular shape, but may be formed in, for example, a track shape, an elliptical shape, an oval shape, a rectangular shape, an elongated shape, or the like.
The braking member 5 according to the above embodiment includes the sound absorbing member 6, but is not limited to this form. For example, the sound absorbing member 6 may not be provided, and the upper ventilation hole 51 and the lower end ventilation hole 52 are not provided. Between the two, a pore-shaped air passage 81 may be formed.

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. It is sectional drawing. FIG. 2 is an exploded cross-sectional view of the speaker device 1 shown in FIG. 3A is a top view of the braking member 5 shown in FIG. 1B, and FIG. 3B is a rear view of the braking member 5 shown in FIG. 3A. FIG. 4 is a top view of the sound absorbing member 6 shown in FIG. FIG. 5 is a cross-sectional view of the speaker device 1B according to the second embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker apparatus 2 Magnetic circuit 3 Vibrating body 4 Frame 5 Braking member 21 Yoke 22 Magnet 23 Plate (pole part)
31 Voice coil 32 Voice coil bobbin 33 Diaphragm 34 Edge (diaphragm support)
51 Upper ventilation hole (ventilation hole, slit)
52 Bottom Vent (Vent)
53 Supporting part (supporting part)

Claims (5)

A magnetic circuit comprising a magnet and a pole portion;
A dome-shaped diaphragm,
A frame that supports the dome-shaped diaphragm so as to vibrate;
A voice coil joined to the dome-shaped diaphragm directly or via a voice coil bobbin and disposed in a magnetic gap of the magnetic circuit;
A dome-shaped braking member disposed between the dome-shaped diaphragm and the pole portion and proximate to the dome-shaped diaphragm;
The said braking member has a ventilation hole connected to the inside of this braking member, and the sound-absorbing member arrange | positioned inside this braking member, The speaker apparatus characterized by the above-mentioned. In the braking member, the ventilation hole is formed near the upper portion of the braking member,
A lower end air hole communicating with the inside of the braking member is formed between the braking member and the pole portion or in the vicinity of the lower end portion of the braking member,
The speaker device according to claim 1, wherein the sound absorbing member is disposed inside the braking member and is disposed between the upper vent and the lower end vent.   3. The speaker device according to claim 1, wherein the braking member has a support portion that fits into a fitted portion formed in a pole portion of the magnetic circuit.   The speaker device according to claim 3, wherein the sound absorbing member is formed in an annular shape and is disposed between an inner side surface portion of the braking member and the support portion.   5. The air passage according to claim 2, further comprising: an upper ventilation hole of the braking member; an air-absorbing sound-absorbing member disposed inside the braking member; and an air passage that passes through the lower-end ventilation hole. The speaker device described in 1.

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