JP2005184588A - Speaker and electronic equipment using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent speaker for contriving thinning by reducing unnecessary resonance of a vibration plate concerning the speaker and electronic equipment which are used for an accoustic device. <P>SOLUTION: The speaker has an outline other than a circle, composed of seat material, covers by one sheet on the inner peripheral side and the outer peripheral side of a voice coil 28, is nearly dome shape in a cross section of the inner peripheral side of the voice coil, and composed using a vibration plate in which a hollow is formed in a part of the nearly dome shape. By this method, the speaker is composed to be able to realize the thin type speaker. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a speaker and an electronic device used for various acoustic devices and information communication devices.

  A conventional technique will be described with reference to FIG.

  FIG. 6 is a cross-sectional view of a conventional speaker.

  As shown in FIG. 6, 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 having a circular planar shape is coupled to the diaphragm 7, and is fitted into the magnetic gap 5 of the magnetic circuit 4. Are so coupled.

  Here, the outer shape of the diaphragm 7 is formed in an elliptical shape so that it can be miniaturized even if it is arranged on the side surface of a video display means such as a cellular phone.

  Further, the cross-sectional shape of the diaphragm 7 on the inner peripheral side from the coupling portion with the voice coil 8 is formed in a substantially dome shape.

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

  The above-mentioned speakers are strongly demanded by the market for thin and small electronic devices such as mobile phones, and the speakers used in these sets are also strongly thin and small. It has been requested.

  In particular, for a cellular phone capable of stereo distribution, speakers must be arranged on both sides of a video display means such as a liquid crystal, and the area occupied by the speakers is twice that of the conventional monaural system.

  Further, with respect to the signal processing and audio amplifying means, as compared with the conventional monaural system, the area occupied by the circuit becomes large for a mobile phone capable of stereo reception.

  For the above reasons, there is a strong demand from the market to reduce the thickness and size of speakers.

  Thus, for downsizing, speakers with a circular diaphragm outer shape have been the mainstream in the past, but recently, many so-called slim speakers with long and short diameters such as elliptical shapes, track shapes, and rectangular shapes have been developed. It has become.

  Attempts have been made to achieve miniaturization and compactness by arranging these slim speakers in the vertical direction on both side surfaces of image display means such as liquid crystal.

  In other words, it is aimed at downsizing and downsizing of a mobile phone capable of handling an increasing size of stereo reception by devising the arrangement of the components in the planar direction.

  As described above, countermeasures for downsizing and downsizing have been promoted, but countermeasures for reduction in thickness have been an issue.

  With regard to this thinning, the arrangement of the cellular phone is devised without overlapping the components as much as possible. However, in recent years when folding cellular phones are becoming mainstream, it is inevitably difficult to reduce the thickness.

  Therefore, in order to reduce the thickness of electronic devices such as mobile phones, it is essential to reduce the thickness of the speaker.

  For this reason, if the height of the diaphragm is designed to be thin in order to reduce the thickness of the speaker, the shape rigidity of the diaphragm is reduced, unnecessary resonance is generated, and the sound pressure frequency characteristic is hindered. I had it.

  However, for these slim speakers, the outer shape of the diaphragm is a shape other than a circle, and the voice coil is often a circular one, so the resonance from this voice coil to the outer shape of the diaphragm It has a shape that is difficult to occur.

  This is because the outer shape of the diaphragm is a shape other than a circle, and when this is driven by a circular voice coil, the distance from the planar circular voice coil of the diaphragm to the outer shape of the diaphragm depends on each angle. This is because resonance is dispersed because the angle is different, and energy is not concentrated on a certain frequency component.

  In comparison, the resonance from the inner periphery of the circular voice coil, that is, the resonance from the voice coil to the inner periphery of the diaphragm is circular, and the dome-shaped curvature of the cross section is changed to reduce the thickness. Therefore, there is a problem that the shape rigidity is lowered and unnecessary resonance frequently occurs.

  And since it is comprised from the resin film sheet | seat of the diaphragm, it exists in the tendency for resonance to generate | occur | produce notably with a small internal loss.

  An object of the present invention is to solve the above-mentioned problems and to provide an excellent speaker capable of reducing unnecessary resonance of the diaphragm and reducing the thickness.

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

  According to the first aspect of the present invention, there is provided a frame coupled to a magnetic circuit and an outer peripheral portion of the frame. The outer shape of the frame is other than a circle and is made of a sheet material. A speaker is constituted by a diaphragm that covers the inner and outer peripheries of the coil and a voice coil that is coupled to the diaphragm and a part of which is disposed in the magnetic gap of the magnetic circuit.

  And the cross-sectional shape of the inner peripheral part of the voice coil of the diaphragm of this speaker has a substantially dome shape, and a recess is formed in a part of the substantially dome shape.

  With this configuration, by forming a recess in the diaphragm, the overall height of the diaphragm can be reduced, the shape rigidity can be increased, unnecessary resonance can be reduced, the speaker can be reduced in thickness, and the sound pressure frequency characteristics Can be realized.

  According to the second aspect of the present invention, the outer shape of the diaphragm is formed in an elliptical shape.

  With this configuration, it is possible to reduce the thickness of the elliptical slim speaker, which is advantageous for downsizing, and to stabilize the sound pressure frequency characteristics.

  According to a third aspect of the present invention, the outer shape of the diaphragm is formed in a track shape.

  With this configuration, it is possible to reduce the thickness of the track-shaped slim speaker, which is advantageous for downsizing, and to stabilize the sound pressure frequency characteristics.

  According to a fourth aspect of the present invention, the outer shape of the diaphragm is formed in a rectangular shape.

  With this configuration, it is possible to reduce the thickness of the rectangular slim speaker, which is advantageous for downsizing, and to stabilize the sound pressure frequency characteristics.

  According to a fifth aspect of the present invention, an electronic device is configured by mounting any one of the speakers according to the first to fourth aspects.

  With this configuration, the electronic device can be reduced in thickness and size.

  As described above, according to the present invention, the outer shape is a shape other than a circle and is made of a sheet material, and the inner periphery side and the outer periphery side of the voice coil are covered with one sheet, and the sectional shape of the inner periphery side of the voice coil is substantially A speaker is formed using a diaphragm having a dome shape and a recess formed in a part of the dome shape.

  With this configuration, by forming a recess in the diaphragm, the overall height of the diaphragm can be reduced, the shape rigidity can be increased, unnecessary resonance can be reduced, and the sound pressure frequency characteristics of the speaker can be stabilized. And thinning can be realized.

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

(Embodiment 1)
Hereinafter, the first and second aspects of the present invention will be described with reference to the first embodiment.

  FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention.

  FIG. 2 shows a plan view thereof.

  As shown in FIGS. 1 and 2, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to form an internal magnet type magnetic circuit 24.

  An elliptical frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of an elliptical diaphragm 27 made of a sheet material and covering the inner and outer peripheral sides of the voice coil 28 is bonded to the peripheral edge of the elliptical frame 26.

  One end of the voice coil 28 is coupled to the elliptical diaphragm 27 and the other end is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24.

  The cross-sectional shape of the diaphragm 27 on the inner peripheral side from the coupling portion with the voice coil 28 is formed by forming a recess 27A in a part of the substantially dome-shaped portion.

  With this configuration, by forming the recess 27A in the diaphragm 27, the overall height of the diaphragm 27 can be reduced, the shape rigidity can be increased, unnecessary resonance can be reduced, and the speaker can be reduced in thickness and sound. Stabilization of the pressure frequency characteristics can be realized.

  Here, the outer shape of the diaphragm 27 is not limited to the elliptical shape as shown in the present embodiment, but may be any shape other than a circle.

(Embodiment 2)
Hereinafter, the invention described in claim 3 of the present invention will be described with reference to the second embodiment.

  FIG. 3 shows a plan view of a speaker according to an embodiment of the present invention.

  Only differences from the first embodiment will be described.

  In FIG. 3, the outer shape of the diaphragm 27 is configured as a track shape.

  By adopting this configuration, the linear portion of the speaker constituted by the track shape having the linear portion is arranged in the vertical direction in the vicinity of both sides of the liquid crystal panel for video display, thereby further reducing the size. be able to.

(Embodiment 3)
The third embodiment of the present invention will be described below in particular.

  FIG. 4 shows a plan view of a speaker according to an embodiment of the present invention.

  Only differences from the first embodiment will be described.

  FIG. 4 shows a configuration in which the outer shape of the diaphragm 27 is a rectangular shape.

  By adopting this configuration, the linear portion in the major axis direction of the speaker composed of a rectangular shape having a linear portion is arranged in the vertical direction close to both sides of the liquid crystal panel for video display, thereby further reducing the size. Can be implemented.

(Embodiment 4)
Hereinafter, the invention according to the fifth aspect of the present invention will be described with reference to the fourth embodiment.

  FIG. 5 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. 5, a cellular phone 80 is configured by mounting any one of the speakers 30 according to claims 1 to 4.

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

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

  The speaker and the electronic device according to the present invention can be applied to a speaker, an audiovisual device, an information communication device, a game device, and the like that need to be thinned and miniaturized.

Sectional drawing of the speaker in one embodiment of this invention The top view of the speaker in one embodiment of this invention The top view of the speaker in one embodiment of this invention The top view of the speaker in one embodiment of this invention Sectional drawing of the principal part of the electronic device in one embodiment of this invention Cross-sectional view of a conventional speaker

Explanation of symbols

21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 27A Diaphragm depression 28 Voice coil 30 Speaker 40 Electronic circuit 60 Liquid crystal display 70 Exterior case 80 Mobile phone

Claims (5)

A frame coupled to a magnetic circuit, and a vibration coupled to the outer periphery of the frame, the outer shape of which is a shape other than a circle and made of sheet material, and covers the inner and outer peripheral sides of the voice coil with a single piece A speaker comprising a plate and the voice coil coupled to the diaphragm and a part of the voice coil disposed in a magnetic gap of the magnetic circuit, the cross section of the inner peripheral portion of the voice coil of the diaphragm The speaker has a substantially dome shape, and a recess is formed in a part of the substantially dome shape. The speaker according to claim 1, wherein an outer shape of the diaphragm is formed in an elliptical shape. The speaker according to claim 1, wherein the outer shape of the diaphragm is formed into a track shape. The speaker according to claim 1, wherein an outer shape of the diaphragm is formed in a rectangular shape. An electronic device on which any one of the speakers according to claim 1 is mounted.

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