JP4556565B2 - Speaker, module using the same, electronic device and apparatus - Google Patents

Description

  The present invention relates to speakers and modules used in various acoustic devices and information communication devices, and electronic devices and devices such as mobile phones and game devices.

  A conventional technique will be described with reference to FIG.

  6A is a sectional view of a conventional speaker, and FIG. 6B is a sectional view of the diaphragm.

  As shown in FIG. 6A, a magnetized magnet 1 is sandwiched between an upper plate 2 and a yoke 3 to constitute an inner magnet type magnetic circuit 4. A frame 6 is coupled to the yoke 3 of the magnetic circuit 4.

  A diaphragm 7 made of a resin film is coupled to the peripheral portion of the frame 6, and a voice coil 8 is coupled to the diaphragm 7, and coupled so as to fit into the magnetic gap 5 of the magnetic circuit 4. Yes.

  Here, as shown in FIG. 6B, the cross-sectional shape of the diaphragm 7 on the outer peripheral side from the coupling portion with the voice coil 8 has a substantially dome shape. In order to simplify the molding die for molding, it is composed of a diaphragm formed in a single arc shape for simplification.

For example, Patent Document 1 is known as prior art document information relating to the invention of this application.
JP 2003-235097 A

  There is a strong demand from the market for the above-described speakers to be thin in electronic devices such as mobile phones.

  Therefore, to make these electronic devices thinner, it is essential to make the speakers thinner.

  However, if the diaphragm 7 made of a resin film is designed to be thin in order to reduce the thickness of the speaker, the shape rigidity of the diaphragm 7 is reduced and the high frequency limit frequency of the speaker is reduced. It had a problem.

  This is because the diaphragm 7 is designed to be thin, so that when the diaphragm 7 is formed from a single curve such as an arc, the cross-sectional shape is the apex angle of the joint of the diaphragm 7 with the voice coil 8. Must be set larger.

  Accordingly, in this case, the shape rigidity of the joint portion of the diaphragm 7 with the voice coil 8 is lowered, and the high frequency limit frequency is lowered.

  This phenomenon has a great influence on the vertical vibration of the voice coil 8 that the apex angle of the coupling portion between the diaphragm 7 and the voice coil 8 must be set large.

  That is, when the coupling angle between the voice coil 8 and the diaphragm 7 is small, the shape rigidity of the coupling portion of the diaphragm 7 is increased, and the vibration transmission from the voice coil 8 to the diaphragm 7 is improved, and the high frequency limit frequency is increased. However, when the cross-sectional shape is a single arc shape, the overall height of the diaphragm 7 becomes high, and the thickness cannot be reduced.

  An object of the present invention is to solve the above-mentioned problems and to provide an excellent speaker capable of increasing the high-frequency limit frequency and reducing the thickness.

  In order to achieve the above object, the present invention has the following configuration.

  The present invention includes a frame coupled to a magnetic circuit, a diaphragm coupled to an outer periphery of the frame, a voice coupled to the diaphragm, and a part of which is disposed in a magnetic gap of the magnetic circuit. A speaker is constituted by a coil.

The diaphragm covers the inner periphery and the outer periphery of the voice coil, and the cross section on the outer periphery side of the connection with the voice coil has an elliptical arc shape, or a radius near the connection with the voice coil. Is composed of any one of two curved shapes smaller than the radius other than the coupling portion with the voice coil, and the inner circumferential side of the coupling portion with the voice coil has an elliptical arc shape or a voice coil The radius of the vicinity of the coupling portion is formed by one of curved shapes formed of two types of arcs smaller than the radius other than the portion other than the coupling portion with the voice coil .

  With this configuration, the apex angle of the joint of the diaphragm with the voice coil can be formed sharply, the shape rigidity is increased, the vibration transmission from the voice coil to the diaphragm is improved, and the high frequency limit frequency is extended. Therefore, the speaker can be thinned.

As described above, according to the present invention, the cross-sectional shape of the diaphragm has at least a substantially dome-shaped portion, the cross section on the outer peripheral side from the coupling portion with the voice coil is an elliptical arc shape, or the radius near the coupling portion with the voice coil is the voice. It is composed of one of two types of curved shapes that are smaller than the radius other than the coupling portion with the coil, and the inner cross section from the coupling portion with the voice coil has an elliptical arc shape or coupling with the voice coil. It is formed by one of curved shapes formed of two kinds of arcs whose radius near the portion is smaller than the radius other than the portion other than the coupling portion with the voice coil .

  With this configuration, the apex angle of the joint of the diaphragm with the voice coil can be formed sharply, the shape rigidity is increased, the vibration transmission from the voice coil to the diaphragm is improved, and the high frequency limit frequency is extended. Therefore, the speaker can be thinned.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The invention according to the first to sixth aspects of the present invention will be described below with reference to the first embodiment.

  Fig.1 (a) shows sectional drawing of the speaker of one Embodiment of this invention.

  FIGS. 1B to 2G are cross-sectional views of a diaphragm used in the speaker according to the embodiment of the present invention.

  FIG. 1B shows a cross-sectional view of the diaphragm according to an embodiment of the present invention, and the cross-sectional shape on the outer peripheral side from the coupling portion with the voice coil is formed in a substantially dome-shaped elliptical arc shape. It is.

  In FIG. 1C, the cross-sectional shape on the outer peripheral side from the coupling portion with the voice coil is substantially dome-shaped, and the radius near the coupling portion with the voice coil is smaller than the radius other than the coupling portion with the voice coil. It is composed of a curved shape composed of various arcs.

  FIGS. 2D to 2G show the above-described diaphragm cross-sectional shape formed on the inner periphery of the voice coil. FIG. 2D shows the inner periphery of the voice coil. The outer periphery also has an elliptical arc shape.

  FIG. 2 (e) shows a curve composed of two types of arcs in which the inner periphery of the voice coil has an elliptical arc shape, and the outer periphery has a radius near the coupling portion with the voice coil that is smaller than the radius other than the coupling portion with the voice coil. It consists of a shape.

  FIG. 2 (f) shows a curve composed of two types of arcs in which the outer peripheral portion of the voice coil has an elliptical arc shape, and the inner peripheral portion has a radius near the coupling portion with the voice coil that is smaller than the radius other than the coupling portion with the voice coil. It consists of a shape.

  FIG. 2 (g) shows a curved shape composed of two types of arcs in which the radius near the coupling portion with the voice coil is smaller than the radius other than the coupling portion with the voice coil at both the inner and outer peripheral portions of the voice coil. It is composed.

  As described above, regarding the cross-sectional shape of the diaphragm 27, the shape of the present invention can be applied in various combinations to the inner peripheral portion and the outer peripheral portion of the voice coil.

  As described above, it is disclosed in the present embodiment on the premise that the cross-sectional shape in the vicinity of the coupling portion with the voice coil can be reduced if the apex angle of the coupling portion can be formed sharply or in combination. It may be a shape or combination other than the contents described above, and the effect can be obtained.

  Next, a speaker using the above-described diaphragm will be described below.

  As shown in FIG. 1A, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to form an inner magnet type magnetic circuit 24.

  A frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of the diaphragm 27 is bonded to the peripheral edge of the frame 26, and one end of the voice coil 28 is coupled to the diaphragm 27, and the other end is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24. Configured.

  Here, as described above, the diaphragm 27 covers the inner peripheral portion and the outer peripheral portion of the voice coil 28 as a single piece, and the cross-sectional shape on the outer peripheral side from the connecting portion with the voice coil 28 is substantially dome-shaped. An elliptical arc shape is used.

  In addition to the above-mentioned shape, the cross-sectional shape on the outer peripheral side from the coupling portion with the voice coil 28 is also substantially dome-shaped, and the radius near the coupling portion with the voice coil 28 is larger than the radius other than the coupling portion with the voice coil 28. Also, it may be configured by a curved shape made up of two kinds of small arcs.

  With this configuration, the apex angle of the joint portion of the diaphragm 27 with the voice coil 28 can be formed sharply, the shape rigidity of the diaphragm 27 is increased, and vibration transmission from the voice coil 28 to the diaphragm 27 is good. Thus, the high frequency limit frequency can be extended, and the speaker can be thinned.

  Further, when the diaphragm cross-sectional shape is configured as an elliptical arc shape, the diaphragm shape can be defined by a simple function, and a production tool such as a mold of the diaphragm 27 can be created with high production efficiency.

Further, by forming the above-described diaphragm cross-sectional shape also on the inner periphery of the voice coil 28 , the shape rigidity of the inner periphery of the voice coil of the diaphragm 27 can be increased, and the high frequency limit is further increased. The frequency can be extended.

  Therefore, further thinning of the speaker can be realized.

  And the material of this diaphragm 27 is comprised with the sheet-like resin material.

  With this configuration, the shape of the diaphragm 27 can be easily formed, and further weight reduction can be achieved. Therefore, it is possible to improve the productivity of the diaphragm 27 and the speaker and the sound pressure level.

  In addition, a groove-shaped guide 27A into which a part of the voice coil 28 is inserted is formed at the coupling portion of the diaphragm 27 with the voice coil 28.

  With this configuration, the productivity of coupling the diaphragm 27 with the voice coil 28 can be improved, the shape rigidity of the coupling portion can be improved, and vibration transmission from the voice coil 28 to the diaphragm 27 can be ensured without loss. Can be realized.

  Therefore, it is possible to extend the high frequency limit frequency and contribute to further thinning of the speaker.

(Embodiment 2)
The second aspect of the present invention will be described below with reference to the seventh aspect of the present invention.

  FIG. 3 is a cross-sectional view of the speaker module according to the embodiment of the present invention.

As shown in FIG. 3, the speaker module 50 is configured by integrating any one of the speakers 30 and the electronic circuit 40 according to claims 1 to 6 .

Here, as a configuration of the speaker module 50, the electronic component 42 is fixed and wired on the circuit board 41 to configure the electronic circuit 40. The electronic circuit 40 and the speaker 30 according to any one of claims 1 to 6 are integrally coupled to constitute a speaker module 50.

  The electronic circuit 40 includes at least an amplifier circuit for an audio signal supplied to the speaker. That is, a circuit for amplifying a signal-processed audio signal to a level necessary for outputting from the speaker is already integrated with the speaker and also has an internal wiring, so this speaker module is coupled. Sound output can be easily obtained with just this.

  In addition to the amplifier circuit, the electronic circuit 40 is a circuit required for communication such as a detection circuit, a modulation circuit, and a demodulation circuit, or a display means such as a liquid crystal if it is a communication device such as a mobile phone. In addition, various circuits such as a power supply circuit and a charging circuit can be included.

  By adopting this configuration, the speaker and electronic circuit, which were conventionally produced separately and supplied to the production base of electronic devices such as mobile phones through each inspection process and logistics process, are integrated into a module. As a result, it is possible to integrate the production process, the inspection process, and the distribution process, and to greatly reduce the cost.

  Therefore, the speaker module 50 in which the speaker 30 and the electronic circuit 40 are combined can be provided at a low cost.

  Further, the speaker module 50 can be made smaller and thinner by making the speaker 30 smaller and thinner.

(Embodiment 3)
Hereinafter, the invention according to the eighth aspect of the present invention will be described with reference to the third embodiment.

  FIG. 4 is a cross-sectional view of a main part of a mobile phone which is an electronic apparatus according to an embodiment of the present invention.

As shown in FIG. 4, a mobile phone 80 is configured by mounting any one of the speakers 30 according to claims 1 to 6 .

  Here, as a configuration of the mobile phone 80, components such as a speaker 30, an electronic circuit 40, a display module 60 such as a liquid crystal, modules, and the like are mounted inside the exterior case 70 to constitute a main part of the mobile phone 80. is doing.

  With this configuration, it is possible to reduce the thickness and size of electronic devices such as mobile phones.

(Embodiment 4)
Hereinafter, with reference to the fourth embodiment will be described the invention described in particular claim 9 of the present invention.

  FIG. 5 shows a cross-sectional view of an automobile 90 which is an apparatus according to an embodiment of the present invention.

  As shown in FIG. 5, an automobile 90 is configured by incorporating the speaker 30 of the present invention into a rear tray or a front panel and using it as a part of car navigation or car audio.

  By adopting this configuration, it is possible to reduce the thickness and size of a device such as an automobile on which the speaker 30 is mounted by reducing the thickness and size of the speaker 30.

  The speaker, the speaker module, the electronic device, and the device according to the present invention can be applied to an audio / video device, an information communication device, an electronic device such as a game device, and a device such as an automobile that need to be reduced in thickness and size.

(A) A cross-sectional view of a speaker according to an embodiment of the present invention, (b) a cross-sectional view of a diaphragm according to an embodiment of the present invention, and (c) a cross-sectional view of a diaphragm according to an embodiment of the present invention. (D) Cross-sectional view of diaphragm in one embodiment of the present invention, (e) Cross-sectional view of diaphragm in one embodiment of the present invention, (f) Cross-sectional view of diaphragm in one embodiment of the present invention (G) Sectional drawing of the diaphragm in one embodiment of this invention Sectional drawing of the speaker module in one embodiment of this invention Sectional drawing of the principal part of the electronic device in one embodiment of this invention Sectional drawing of the apparatus in one embodiment of this invention (A) Cross-sectional view of a conventional speaker, (b) Cross-sectional view of a conventional diaphragm

DESCRIPTION OF SYMBOLS 21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 27A Diaphragm groove part 28 Voice coil 30 Speaker 40 Electronic circuit 41 Circuit board 42 Electronic component 50 Speaker module 60 Display module 70 Exterior case 80 Cellular phone 90 Automobile

Claims (9)

A frame coupled to the magnetic circuit, a diaphragm coupled to the outer periphery of the frame, and a voice coil coupled to the diaphragm and part of which is disposed in the magnetic gap of the magnetic circuit In the speaker, the diaphragm covers the inner peripheral portion and the outer peripheral portion of the voice coil with one piece, and the cross section on the outer peripheral side from the coupling portion with the voice coil has an elliptical arc shape , and the voice coil The cross section on the inner peripheral side of the coupling portion is formed in either an elliptical arc shape or a curved shape including two types of arcs in which the radius near the coupling portion with the voice coil is smaller than the radius other than the coupling portion with the voice coil. In this way, the speaker achieves high frequency range extension and thinning . A frame coupled to the magnetic circuit, a diaphragm coupled to the outer periphery of the frame, and a voice coil coupled to the diaphragm and part of which is disposed in the magnetic gap of the magnetic circuit In the speaker, the diaphragm covers the inner peripheral portion and the outer peripheral portion of the voice coil with one piece, and the cross section on the outer peripheral side from the connecting portion with the voice coil is near the connecting portion with the voice coil. A curved shape consisting of two types of arcs whose radius is smaller than the radius other than the joint with the voice coil, and the inner cross section of the joint with the voice coil is elliptical arc shape or near the joint with the voice coil speaker radius by forming either a curved shape composed of two arc smaller than the radius of the non-binding portion of a voice coil, which realizes extension and thinning of the high-frequency-band limit frequency of the Any one speaker configurations claims 1 or claim 2, wherein the vibrating plate by a resin material. The speaker according to any one of claims 1 to 3, wherein the diaphragm is made of a sheet material. The speaker according to any one of claims 1 to 4 , wherein a guide is formed at a coupling portion between the diaphragm and the voice coil. 6. The speaker according to claim 5, wherein the guide has a groove into which a part of the voice coil is inserted. The module which combined any one speaker and electronic circuit of Claim 1-6 . Electronic device equipped with one of the loudspeakers of claim 6 according to claims 1. Apparatus equipped with any one speaker of claim 6 according to claims 1.

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