Patent Publication Number: US-8542864-B2

Title: Speaker device

Description:
RELATED APPLICATION 
     The present application claims priority to Japanese Patent Application Number 2009-277628, filed Dec. 7, 2009, the entirety of which is hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a speaker device that outputs sound by vibrating a diaphragm which is connected to a voice coil by mutual action between a magnetic field generated in a magnetic circuit and an audio signal current that flows through the voice coil. 
     2. Description of the Related Art 
     Heretofore, an angular and thin-shaped speaker device has been proposed (see Japanese Unexamined Utility Model Registration Application Publication No. 58-48194). This speaker device is configured so that a flat drive plate (voice coil unit) formed of a voice coil is disposed within a magnetic gap formed by two magnets, and one end portion of the drive plate is attached to the back face of the flat diaphragm. The other end portion of the drive plate is elastically supported by a supporting member so that the drive plate can vibrate within the magnetic gap in a direction parallel to the face thereof. With such a configuration, the drive plate vibrates in a direction parallel to the face thereof by mutual action between the audio signals supplied to the voice coil and the magnetic flux that cuts across the magnetic gap, and sound is output corresponding to the audio signals by the flat diaphragm, to which the vibrating drive plate is attached. 
     However, with the above-described current speaker device, one end portion of the drive plate (voice coil unit) is attached to the flat diaphragm and the opposite end portion of the drive plate is elastically supported by a supporting member, whereby obtaining amplitude by the drive plate (voice coil unit) in the direction parallel to the face thereof is difficult. Therefore, obtaining a loud audio output is difficult. 
     The present invention takes this situation into account, and provides a speaker device wherein the voice coil unit can vibrate with a greater amplitude. 
     SUMMARY 
     A speaker device according to one embodiment of the present invention has a configuration including a magnetic circuit forming a magnetic gap; a voice coil unit disposed in the magnetic gap; and a diaphragm linked to the voice coil unit. The voice coil unit further includes a voice coil line patterns formed on the surface of a flat flexible material, and a first supporting unit and a second supporting unit that elastically support the voice coil unit, which are formed following both end portions of the voice coil portion of the flat flexible material. An end portion of the first supporting unit and the second supporting unit, which is on the side opposite from the voice coil portion, is fixed to a fixing position to enable vibrations of the voice coil portion within the magnetic gap in the direction of the face thereof and each of the first supporting unit and the second supporting unit elastically support the voice coil portion in a shape that extends up and bends down from the end portion that is fixed to the fixing position. 
     With such a configuration, each of the first supporting unit and the second supporting unit following from both end portions of the voice coil portion disposed within the magnetic gap formed in the magnetic circuit are elastically supporting the voice coil portion in a form that extends up from the end portion fixed to the fixing position and bends down, whereby when the voice coil portion vibrates within the magnetic gap in the face direction thereof, the vibrations of the voice coil portion are maintained while deforming the bent form of each of the first supporting unit and the second supporting unit in accordance with the vibrations of the voice coil portion. 
     The speaker device may have a configuration wherein connecting points are formed at the edge portions fixed to the fixing position of at least one of the first supporting unit and the second supporting unit, and a line pattern following the connecting points through the voice coil line pattern is formed on the at least one of the first supporting unit and the second supporting unit. 
     With such a configuration, a connecting point connected to the voice coil line pattern is formed on at least one end portion of the first supporting unit and the second supporting unit fixed to the fixing position, whereby a lead line supplying an audio signal to the voice coil line pattern via the connecting points can be distributed without influence from the vibrations of the voice coil portion. 
     Also, the speaker device may have a configuration further including positioning members that determine the positions of parts making up the magnetic circuit, wherein the fixing positions to which the end portions of each of the first supporting unit and the second supporting unit are fixed are set in the positioning members. 
     With such a configuration, the end portions of each of the first supporting unit and the second supporting unit that elastically support the voice coil portion are fixed by the positioning members that determine positions of the parts making up the magnetic circuit, whereby assembly of the magnetic circuit and the voice coil unit can be easily performed. 
     The speaker device may have a configuration wherein the fixing positions to which at least one of the edge portions of the first supporting member and the second supporting member on which the connecting points are formed is fixed, is set so as to be a concave portion, and by fitting the terminal member having corresponding connecting points into the concave portion, the audio signal from the outside is supplied to the voice coil line pattern via the terminal member. 
     With such a configuration, by fitting the terminal member into the concave portion wherein the fixing position is set, to which at least one end portion of the first supporting unit and the second supporting unit is fixed, the audio signal is supplied to the voice coil line pattern via the terminal member, whereby the audio signal can be supplied to the voice coil line pattern without soldering. 
     A speaker device according to an embodiment of the present invention has a configuration including a magnetic circuit forming a magnetic gap; a voice coil unit disposed in the magnetic gap; and a diaphragm linked to the voice coil unit, the magnetic circuit further forming two facing magnetic gaps. The voice coil unit includes a first voice coil portion including a first voice coil line pattern formed on the surface of a flat flexible material; a second voice coil portion including a second voice coil line pattern formed on the surface of a flat flexible material; a first-first supporting unit and a second-first supporting unit which are formed following both edge portions of the first voice coil portion of the flat flexible material, and which elastically support the first voice coil portion; a first-second supporting unit and a second-second supporting unit which are formed following both edge portions of the second voice coil portion of the flat flexible material, and which elastically support the second voice coil portion; wherein the edge portion on the side opposite from the first voice coil portion of each of the first-first supporting unit and the second-first supporting unit is fixed to fixing positions so as to enable vibration of the first voice coil portion in one of the magnetic gaps in the direction of the face thereof; wherein the edge portion on the side opposite from the second voice coil portion of each of the first-second supporting unit and the second-second supporting unit is fixed to fixing positions so as to enable vibration of the second voice coil portion in the other of the magnetic gaps in the direction of the face thereof; wherein each of the first-first supporting unit and the second-first supporting unit elastically supports the first voice coil portion in a bent shape that extends up from the end portion fixed to the fixing position and bends down; and wherein each of the first-second supporting unit and the second-second supporting unit elastically supports the second voice coil portion in a bent shape that extends up from the end portion fixed to the fixing position and bends down. 
     With such a configuration, each of the first-first supporting unit and the second-first supporting unit following from the end portions of the first voice coil portion disposed in one of the magnetic gaps formed in the magnetic circuit elastically supports the first voice coil portion in a form that extends up from the end portions fixed to the fixing position and bends down, and each of the first-second supporting unit and the second-second supporting unit following from the end portions of the second voice coil portion disposed in the other of the magnetic gaps formed in the magnetic circuit elastically supports the second voice coil portion in a form that extends up from the end portions fixed to the fixing positions and bends down, whereby when the first voice coil portion and the second voice coil portion vibrate within the magnetic gaps in the direction of the faces thereof, the vibration of the first voice coil portion is maintained while deforming the bent form of each of the first-first supporting unit and the second-first supporting unit in accordance with the vibrations of the first voice coil portion, and also, the vibration of the second voice coil portion is maintained while deforming the bent form of each of the first-second supporting unit and second-second supporting unit in accordance with the vibrations of the second voice coil portion. 
     The speaker device may have a configuration wherein a connecting point is formed on the end portion fixed to at least one of the fixing positions of the first-first supporting unit and the second-first supporting unit of the voice coil unit, and a line pattern following the connecting point through the first voice coil line pattern is formed on at least one of the first-first supporting unit and the second-first supporting unit including the connecting point on the end portion. 
     With such a configuration, a connecting point connected to the first voice coil line pattern is formed on at least one end portion of the first-first supporting unit and the second-first supporting unit fixed to the fixing position, whereby the lead line supplying the audio signal to the first voice coil line pattern via the connecting point can be distributed without influence from the vibration of the first voice coil portion. 
     The speaker device may have a configuration wherein a connecting point is formed on the end portion fixed to at least one of the fixing positions of the first-second supporting unit and the second-second supporting unit, and a line pattern following the connecting point through the second voice coil line pattern is formed on at least one of the first-second supporting unit and the second-second supporting unit including the connecting point on the end portion. 
     With such a configuration, a connecting point connected to the second voice coil line pattern is formed on at least one end portion of the first-second supporting unit and the second-second supporting unit fixed to the fixing position, whereby the lead line supplying the audio signal to the second voice coil line pattern via the connecting point can be distributed without influence from the vibration of the second voice coil portion. 
     The speaker device may have a configuration further including positioning members that determine the position of the parts making up the magnetic circuit, wherein the fixing positions to which the end portions of each of the first-first supporting unit and the second-first supporting unit are fixed, and wherein the fixing positions to which the end portions of each of the first-second supporting unit and the second-second supporting unit are fixed, are set in the positioning members. 
     With such a configuration, each end portion of the first-first supporting unit and the second-first supporting unit that elastically supports the first voice coil portion is fixed by the positioning members that determine the position of the parts making up the magnetic circuit, and also, each end portion of the first-second supporting unit and the second-second supporting unit that elastically supports the second voice coil portion is fixed by the positioning members that determine the position of the parts making up the magnetic circuit, whereby assembly of the magnetic circuit and the voice coil unit can be performed easily. 
     The speaker device may have a configuration wherein the fixing positions to which at least one of the end portions of the first-first supporting unit and the second-first supporting unit is fixed, is set into a concave unit, and a terminal member having a corresponding connecting point is fit into the concave portion, whereby audio signals are supplied from the outside via the terminal member to the first voice coil line pattern. 
     With such a configuration, by fitting the terminal member into the concave portion wherein the fixing position is fixed, to which at least one end portion of the first-first supporting unit and the second-first supporting unit is fixed, the audio signal is supplied to the first voice coil line pattern via the terminal member without soldering. 
     The speaker device may have a configuration wherein the fixing positions to which at least one of the end portions of the first-second supporting unit and the second-second supporting unit whereupon the connecting point is formed is set into a concave unit, and a terminal member having a corresponding connecting point is fit into the concave portion, whereby audio signals are supplied from the outside via the terminal member to the second voice coil line pattern. 
     With such a configuration, by fitting the terminal member into the concave portion wherein the fixing position is fixed, to which at least one end portion of the first-second supporting unit and the second-second supporting unit is fixed, the audio signal is supplied to the second voice coil line pattern via the terminal member without soldering. 
     A speaker device according to an embodiment of the present invention may have a configuration wherein the first-first supporting unit that follows from one end portion of the first voice coil portion and the first-second supporting unit that follows from one end portion of the second voice coil portion are formed so as to be continuous, and the border portion between the first-first supporting unit and the first-second supporting unit is fixed to the first fixing position; and the second-first supporting unit that follows from the other end portion of the first voice coil portion and the second-second supporting unit that follows from the other end portion of the second voice coil portion are formed so as to be continuous, and the border portion between the second-first supporting unit and the second-second supporting unit is fixed to the second fixing position. 
     With such a configuration, the first-first supporting unit and the second-first supporting unit following the first voice coil portion and the first-second supporting unit and the second-second supporting unit following the second voice coil portion are formed so as to be continuous, whereby the first voice coil portion, the second voice coil portion, the first-first supporting unit, the second-first supporting unit, the first-second supporting unit, and the second-second supporting unit can be made from the same piece of flat flexible material, and the construction of the voice coil unit can be made simpler. 
     Also, each of the first-first supporting unit and the first-second supporting unit following one end portion of the first voice coil portion and the second voice coil portion elastically supports one end portion of the first voice coil portion and the second voice coil portion in a form that extends up from the border portions wherein the supporting units are fixed to a first fixing position and bends down, and each of the second-first supporting unit and the second-second supporting unit following the other end portion of the first voice coil portion and the second voice coil portion elastically supports the other end portion of the first voice coil portion and second voice coil portion in a form that extends up from the border portions wherein the supporting units are fixed to a second fixing position and bends down, whereby when the voice coil portion vibrates within the magnetic gap in the face direction thereof, the vibration of the voice coil portion is maintained while deforming the bent form of each of the first supporting unit and the second supporting unit in accordance with the vibration of the voice coil portion, and the vibration of the voice coil portion is maintained while deforming the bent form of each of the first supporting unit and the second supporting unit in accordance with the vibration of the voice coil portion. 
     The speaker device may have a configuration wherein a connecting point is formed on at least one of the border portion between the first-first supporting unit and the first-second supporting unit and the border portion between the second-first supporting unit and the second-second supporting unit, wherein a line pattern that follows the connecting point through the first voice coil line pattern and the second voice coil line pattern is formed on at least one of the first-first supporting unit and the first-second supporting unit and the second-first supporting unit and the second-second supporting unit. 
     With such a configuration, on at least one of the border portion between the first-first supporting unit and the first-second supporting unit fixed to the first and second fixing positions and the border portion between the second-first supporting unit and the second-second supporting unit, a line pattern following the connecting point through the first voice coil line pattern and the second voice coil line pattern is formed on at least one of the first-first supporting unit and the first-second supporting unit and the second-first supporting unit and the second-second supporting unit, whereby a lead line supplying an audio signal to the first voice coil line pattern and the second voice coil line pattern via the connecting point can be distributed without influence from the vibration of the first voice coil portion and the second voice coil portion. 
     The speaker device may have a configuration further including positioning members that determine the position of the parts making up the magnetic circuit, wherein the fixing positions to which the border portions of each of the first-first supporting unit and the first-second supporting unit are fixed, and wherein the fixing positions to which the border portions of each of the second-first supporting unit and the second-second supporting unit are fixed, are set in the positioning members. 
     With such a configuration, the border portion between the first-first supporting unit that elastically supports the first voice coil portion and the first-second supporting unit that elastically supports the second voice coil portion, and the border portion between the second-first supporting unit that elastically supports the first voice coil portion and the second-second supporting unit that elastically supports the second voice coil portion, are fixed by the positioning members that determine the position of the parts making up the magnetic circuit, whereby assembly of the magnetic circuit and the voice coil unit can be performed easily. 
     The speaker device may have a configuration wherein at least one of the first fixing position and the second fixing position, where at least one of the border portion between the first-first supporting unit and the first-second supporting unit on which the connecting point is formed, and the border portion between the second-first supporting unit and the second-second supporting unit is fixed, is set into a concave portion; and wherein a terminal member having a corresponding connecting point is fit into the concave portion, whereby audio signals are supplied from the outside via the terminal member to the first voice coil line pattern and the second line pattern. 
     With such a configuration, by fitting the terminal member into the concave portion wherein at least one of the first fixing position and second fixing position has been set, to which at least one of the border portion between the first-first supporting unit and the second-first supporting unit and the border portion between the second-first supporting unit and the second-second supporting unit is fixed, the audio signal is supplied to the first voice coil line pattern and the second voice coil line pattern via the terminal member, whereby the audio signal can be supplied to the first voice coil line pattern and the second voice coil line pattern without soldering. 
     According to these embodiments of the speaker device, when a voice coil portion vibrates within the magnetic gap in the direction of the face thereof, the vibrations of the voice coil portion are maintained while deforming the bent form of the first supporting unit and the second supporting unit in accordance with the vibrations of the voice coil portion, whereby in the amount that the bent forms of the first supporting unit and the second supporting unit that extend up and bend down are deformed, the amplitude of the vibrations of the first and second voice coil portions that are elastically supported can be increased. Accordingly, a speaker device can be realized wherein the voice coil unit can vibrate with a greater amplitude. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective diagram illustrating an external view of a speaker device unit according to an embodiment of the present invention; 
         FIG. 2  is a cross-sectional diagram showing a cross-sectional configuration of the speaker device shown in  FIG. 1  cut away along a line II-II; 
         FIG. 3  is a perspective diagram showing a configuration of a first inner yoke; 
         FIG. 4  is a perspective diagram illustrating a magnetic plate; 
         FIG. 5  is a perspective diagram illustrating a configuration of a second inner yoke; 
         FIG. 6A  is a perspective diagram illustrating a configuration of a first positioning member; 
         FIG. 6B  is a perspective diagram illustrating a configuration of a second positioning member; 
         FIG. 7  is a perspective diagram illustrating a first outer yoke and a second outer yoke as a pair; 
         FIG. 8  is a perspective diagram illustrating a configuration of a frame member; 
         FIG. 9  is a perspective diagram illustrating a configuration of a voice coil unit relating to the first embodiment of the present invention; 
         FIG. 10  is a perspective diagram illustrating a configuration of a damper member; 
         FIG. 11  is a perspective diagram illustrating a diaphragm; 
         FIG. 12  is a perspective diagram illustrating a first horizontal edge portion and a second horizontal edge portion; 
         FIG. 13A  is a plan view illustrating an example of a voice coil array pattern formed in the voice coil unit; 
         FIG. 13B  is a plan view illustrating another example of a voice coil array pattern formed in the voice coil unit; 
         FIG. 14  is a perspective diagram illustrating a configuration unit formed by layering the magnetic plate over the second inner yoke; 
         FIG. 15  is a perspective diagram illustrating a configuration unit formed by sandwiching the magnetic plate between the first inner yoke and the second inner yoke; 
         FIG. 16  is a perspective diagram illustrating a new configuration unit formed by attaching to the configuration unit shown in  FIG. 15  the first positioning member and the second positioning member; 
         FIG. 17  is a perspective diagram illustrating a new configuration unit in a state wherein the first outer yoke and the second outer yoke are further set in the first positioning unit and the second positioning unit of the configuration unit shown in  FIG. 16 ; 
         FIG. 18  is a perspective diagram showing a new configuration unit formed by attaching the frame member to the configuration unit shown in  FIG. 17 ; 
         FIG. 19  is a perspective diagram showing a new configuration unit formed by attaching the voice coil unit to the configuration unit shown in  FIG. 18 ; 
         FIG. 20  is a perspective diagram illustrating a new configuration unit formed by attaching the damper member to the configuration unit shown in  FIG. 19 ; 
         FIG. 21  is a partial expanded perspective diagram illustrating a fixed configuration of a first vertical edge unit (second vertical edge unit) and frame member in the configuration unit shown in  FIG. 20 ; 
         FIG. 22  is a perspective diagram illustrating a new configuration unit formed by attaching a diaphragm to the configuration unit shown in  FIG. 20 ; 
         FIG. 23  is a partially expanded perspective diagram illustrating a fixed configuration of a damper member and diaphragm of a configuration unit shown in  FIG. 22 ; 
         FIG. 24A  is a perspective diagram illustrating an expansion of a state wherein a second terminal unit of the voice coil unit is set in a terminal set face of a second positioning member; 
         FIG. 24B  is a perspective diagram illustrating an expansion of a fixed configuration of the second terminal unit of the voice coil unit that has been set in the terminal set face of the second positioning member; and 
         FIG. 25  is a diagram showing a magnetic flux within a magnetic circuit in a speaker device of the configuration shown in  FIG. 2 . 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will be described below with reference to the appended diagrams. An external view of a speaker device according to an embodiment of the present invention is shown in  FIG. 1 . 
     A speaker device  10  shown in  FIG. 1  is an angular shaped speaker device, is configured with the parts shown in  FIGS. 3 through 12 , and has the cross-sectional configuration shown in  FIG. 2 . Specifically, the speaker device  10  is formed by assembling the various parts of a rectangular plate-shaped metallic first inner yoke  11  shown in  FIG. 3 , a rectangular plate-shaped magnetic plate  12  shown in  FIG. 4 , a rectangular plate-shaped metallic second inner yoke  13  shown in  FIG. 5 , a first positioning member  16   a  made of a non-magnetic body (for example, a resin) shown in  FIG. 6A , a second positioning member  16   b  made of a non-magnetic body (for example, a resin) shown in  FIG. 6B , a first outer yoke  14  and a second outer yoke  15  shown in  FIG. 7 , a frame member  17  shown in  FIG. 8 , a voice coil unit  18  shown in  FIG. 9 , a damper member  19  shown in  FIG. 10 , a diaphragm  21  shown in  FIG. 11 , and a first horizontal edge unit  22   a  and a second horizontal edge unit  22   b  shown in  FIG. 12 . 
     The first inner yoke  11  (second inner yoke  13 ) shown in  FIG. 3  ( FIG. 5 ) has a configuration wherein positioning protrusions  111  and  112  ( 131  and  132 ) are formed as a pair on one end portion of the lengthwise direction of the rectangular plate-shaped yoke main unit  110  ( 130 ), while positioning protrusions  113  and  114  ( 133  and  134 ) are formed as a pair on the other end portion. Spacing of each pair of the positioning protrusions  111 ,  112  ( 131 ,  132 ) ( 113 ,  114 ) ( 133 ,  134 ), specifically, the distance between the external side faces, are set to predetermined lengths. The magnetic plate  12  shown in  FIG. 4  is formed as a rectangular plate shape having a plate face with a slightly smaller area than the plate faces of the yoke main units  110 ,  130  of each of the first inner yoke  11  and the second inner yoke  13 . 
     The first positioning member  16   a  shown in  FIG. 6A  and the second positioning member  16   b  shown in  FIG. 6B  are used to determine the positions of the first inner yoke  11 , the second inner yoke  13 , the first outer yoke  14 , and the second outer yoke. The configuration of the first positioning member  16   a  will be described below, and the second positioning member  16   b  has the same configuration. In  FIG. 6A  ( FIG. 6B ), an angular-rod shaped first horizontal spacer unit  162   a  ( 162   b ) and a second horizontal spacer unit  163   a  ( 162   b ) are formed on a horizontal bar  160   a  ( 160   b ) so as to extend down therefrom. The spacing of the inner face  162   aa  ( 162   ba ) of the first horizontal spacer unit  162   a  ( 162   b ) and the inner face  163   aa  ( 163   ba ) of the second horizontal spacer unit  163   a  ( 163   b ) is set to the same distance as between the outer side face of the protrusion pairs  111 ,  112  ( 131 ,  132 ), ( 113 ,  114 ), ( 133 ,  134 ) of each of the above-described first inner yoke  11  and second inner yoke  13 . Also, the width in the horizontal direction for each of the first horizontal spacer unit  162   a  ( 162   b ) and the second horizontal spacer unit  163   a  ( 163   b ) is set to a value corresponding to the spacing that the spacers should have. Note that the width is determined taking into account the horizontal width of each of the first inner yoke  11  and the second inner yoke  13  and the magnetic gap Gp that is to be formed. 
     A rectangular-shaped vertical spacer unit  164   a  ( 164   b ) is formed between the first horizontal spacer unit  162   a  ( 162   b ) and the second horizontal spacer unit  163   a  ( 163   b ), so as to connect the generally center portion thereof in the vertical direction of the respective inner faces  162   aa  ( 162   ba ),  163   aa  ( 163   ba ) thereof. The thickness in the vertical direction of the vertical spacer unit  164   a  ( 164   b ) is set to a value that corresponds to the spacing that the spacer should have. Note that this thickness is determined taking into account the spacing that the first inner yoke  11  and the second inner yoke  13  are to maintain, i.e. the thickness of the magnetic plate  12 . Two protruding portions  165   a  ( 165   b ) and  166   a  ( 166   b ) are formed on the upper face of the vertical spacer unit  164   a  ( 164   b ), so as to extend in the direction orthogonal to the direction that the horizontal bar  160   a  ( 160   b ) extends, and in the form whereby the upper outer edges are chamfered. The two protruding portions  165   a  ( 165   b ) and  166   a  ( 166   b ) are positioned symmetrically on the right and the left of the center of the upper face of the vertical spacer unit  164   a  ( 164   b ), at a predetermined spacing. With the two protruding portions  165   a  ( 165   b ) and  166   a  ( 166   b ), the upper face of the vertical spacer unit  164   a  ( 164   b ) is divided into three portions. The portion between the two protruding portions  165   a  ( 165   b ) and  166   a  ( 166   b ) becomes a terminal set face  167   a  ( 167   b ) where the terminal unit of the voice coil unit  18  is set, as described later; the portion between one of the protruding portions  165   a  ( 165   b ) and the first horizontal spacer unit  162   a  ( 162   b ) becomes a first positioning face  164   aa  ( 164   ba ) for determining the position of the first inner yoke  11 ; and further, the portion between the other protruding portion  166   a  ( 166   b ) and the second horizontal spacer unit  163   a  ( 163   b ) becomes a second positioning face  164   ab  ( 164   bb ) for determining the position of the first inner yoke  11 . The spacing between one of the protruding portions  165   a  ( 165   b ) and the first horizontal spacer unit  162   a  ( 162   b ) is set so as to correspond to the width of the positioning protrusion  111  ( 114 ) of the first inner yoke  11 , and the spacing between the other protrusion  166   a  ( 166   b ) and the second horizontal spacer unit  163   a  ( 163   b ) is set so as to correspond to the width of the positioning protrusion  112  ( 113 ) of the first inner yoke  11 . The lower face of the vertical spacer unit  164   a  ( 164   b ) which is on the opposite side from the upper face that is divided into three parts as described above becomes the positioning face to determine the position of the second inner yoke  13 . 
     Note that an integrated outer frame unit  161   a  ( 161   b ) is formed on the horizontal bar  160   a  ( 160   b ). The outer frame unit  161   a  ( 161   b ) is linked to the first outer edge portion  174  and the second outer edge portion  175  of the frame member  17  to be described later, and forms an overall rectangular-shaped frame unit. 
     The first outer yoke  14  and the second outer yoke  15  shown in  FIG. 7  are rectangular plate shapes, and along with the first inner yoke  11 , the second inner yoke  13 , and the magnetic plate  12 , make up the magnetic circuit. The frame member  17  shown in  FIG. 8  is formed by extrusion molding of metal or resin, and has a floor portion  171  having an arch shape on the inner side, a first pressing unit  172  that stands up following one of the end portions of the floor portion  171  and that is to press the first outer yoke  14  as will be described later, a second pressing unit  173  that stands up following the other end portion of the floor portion  171  and that is to press the second outer yoke  15  as will be described later, a first outer edge portion  174  formed following the first pressing unit  172 , and a second outer edge portion  175  formed following the second pressing unit  173 . The first outer edge portion  174  and the second outer edge portion  175  link with the outer frame portions  161   a  and  161   b  (see  FIGS. 6A ,  6 B) of the first positioning member  16   a  and the second positioning member  16   b  as described above, to form the overall rectangular-shaped frame unit. 
     The voice coil unit  18  shown in  FIG. 9  is of a configuration having a first voice coil portion  181  that is formed in a first voice coil array pattern on the surface of a flat flexible board, a second voice coil portion  182  that is formed in a second voice coil array pattern on the surface of the flat flexible board, a first-first supporting unit  183   a  that is formed following one edge portion of the first voice coil portion  181  and that is in a bent state and elastically supports the one edge portion of the first voice coil portion  181 , a second-first supporting unit  183   b  that is formed following the other edge portion of the first voice coil portion  181  and that is in a bent state and elastically supports the other edge portion of the first voice coil portion  181 , a first-second supporting unit  184   a  that is formed following one edge portion of the second voice coil portion  182  and that is in a bent state and elastically supports the one edge portion of the second voice coil portion  182 , a second-second supporting unit  184   b  that is formed following the other edge portion of the second voice coil portion  182  and that is in a bent state and elastically supports the other edge portion of the second voice coil portion  182 . The first-first supporting unit  183   a  that elastically supports the one edge portion of the first voice coil portion  181  and the first-second supporting unit  184   a  that elastically supports the one edge portion of the second voice coil portion  182  are formed so as to be continuous, and the border portion thereof becomes a first terminal unit  185   a  having a U-shaped cross-section. Also, the second-first supporting unit  183   b  that elastically supports the other edge portion of the first voice coil portion  181  and the second-second supporting unit  184   b  that elastically supports the other edge portion of the second voice coil portion  182  are formed so as to be continuous, and the border portion thereof becomes a second terminal unit  185   b  having a U-shaped cross-section. 
     With the voice coil unit  18  shown in  FIG. 9 , the first terminal unit  185   a  and the second terminal unit  185   b  are maintained horizontally, and the first-first supporting unit  183   a  and the second-first supporting unit  183   b  follow both ends of the first voice coil portion  181  of which the surface is bent in a semi-circle or reverse-U-shape so as to extend up from one side of the first terminal unit  185   a  and the second terminal unit  185   b , and is vertically maintained. Also, the first-second supporting unit  184   a  and the second-second supporting unit  184   b  follow both ends of the second voice coil portion  182  of which the surface is bent in a semi-circle or reverse-U-shape so as to extend up from one side of the first terminal unit  185   a  and the second terminal unit  185   b , and is vertically maintained. Thus, the first voice coil portion  181  that is elastically supported with the first-first supporting unit  183   a  and the second-first supporting unit  183   b  can vibrate in the direction of the face thereof (vertical direction), and the second voice coil portion  182  that is elastically supported with the first-second supporting unit  184   a  and the second-second supporting unit  184   b  can vibrate in the direction of the face thereof (vertical direction). 
     The voice coil unit  18  in a state that is laid out flat is shown in  FIG. 13A . In  FIG. 13A , a line pattern L 11  is formed from the first terminal unit  185   a  through the first-first supporting unit  183   a , the first voice coil portion  181  and the second-first supporting unit  183   b  to the second terminal unit  185   b , and a line pattern L 21  is formed from the second terminal unit  185   b  through the second-second supporting unit  184   b , the second voice coil portion  182 , and the first-second supporting unit  184   a , following the line pattern L 11 , to return to the line pattern L 11  of the first terminal unit  185   a . That is to say, the line patterns L 11  and L 21  are formed circularly between the first terminal unit  185   a , the first-first supporting unit  183   a , the first voice coil portion  181 , the second-first supporting unit  183   b , the second terminal unit  185   b , the second-second supporting unit  184   b , the second voice coil portion  182 , and the first-second supporting unit  184   a . Also, on the outer side of the line patterns L 11  and L 21  which connect circularly, a line pattern L 12  is formed from the first terminal unit  185   a  through the first-first supporting unit  183   a , the first voice coil portion  181  and the second-first supporting unit  183   b  to the second terminal unit  185   b , and a line pattern L 22  is formed from the second terminal unit  185   b  through the second-second supporting unit  184   b , the second voice coil portion  182 , and the first-second supporting unit  184   a , following the line pattern L 12 , to return to the line pattern L 12  of the first terminal unit  185   a . That is to say, the line patterns L 12  and L 22  are similarly formed circularly on the outer side of the line patterns L 11  and L 21  which connect circularly. 
     Two pairs of connecting points are formed on the first terminal unit  185   a , and an audio signal is supplied to one pair of connecting points so that audio signal current flows to the line pattern L 11  formed in the first voice coil portion  181  and the line pattern L 21  formed in the second voice coil portion  182 . Also, an audio signal is supplied to the other pair of connecting points so that audio signal current flows in the opposite direction from the audio current that flows in line patterns L 11  and L 21 , to the line pattern L 12  formed in the first voice coil portion  181  and the line pattern L 22  formed in the second voice coil portion  182 . 
     By forming the voice coil unit  18  of a laid-open configuration as shown in  FIG. 13A  to be in a form shown in  FIG. 9 , two line patterns L 11  and L 12  are arrayed above and below on the first voice coil portion  181 , and a first voice coil line pattern  186  is configured with these line patterns L 11  and L 12 . Also, two line patterns L 21  and L 22  are arrayed above and below on the second voice coil portion  182 , and a second voice coil line pattern  187  is configured with these line patterns L 21  and L 22 . 
     A line pattern such as shown in  FIG. 13B  can also be formed on the voice coil unit  18 . In  FIG. 13B  which shows the voice coil unit  18  in a state that is laid out flat, a line pattern L 11  is formed from the first terminal unit  185   a  through the first-first supporting unit  183   a  and the first voice coil portion  181  to the end portion of the first voice coil unit  181 , and a line pattern L 12  is formed from the end portion of the first voice coil portion  181 , following the line pattern L 11 , through the first voice coil portion  181  and the first-first supporting unit  183   a , to return to the first terminal unit  185   a . That is to say, the line patterns L 11  and L 12  are formed in a ring shape through the first terminal unit  185   a , the first-first supporting unit  183   a , and first voice coil portion  181 . Also, a line pattern L 21  is formed from the second terminal unit  185   b  through the second-second supporting unit  184   b  and the second voice coil portion  182 , to the end portion of the second voice coil unit, and a line pattern L 22  is formed from the end portion of the second voice coil portion  182 , following the line pattern L 21 , through the second voice coil portion  182  and the second-second supporting unit  184   b , to return to the second terminal unit  185   b . That is to say, the line patterns L 21  and L 22  are formed in a ring shape through the second terminal unit  185   b , the second-second supporting unit  184   b , and the second voice coil portion  182 . 
     A pair of connecting points is formed on the first terminal unit  185   a , and an audio signal is supplied to the connecting points making up this pair, whereby audio current flows in opposite directions in the line patterns L 11  and L 12  that are formed in a ring shape. Also, a pair of connecting points is formed on the second terminal unit  185   b , and an audio signal is supplied to the connecting points making up this pair, whereby audio current flows in opposite directions in the line patterns L 21  and L 22  that are formed in a ring shape. 
     In the case that the voice coil unit  18  in the laid-open configuration as shown in  FIG. 13B  is formed into the shape shown in  FIG. 9 , two line patterns L 11  and L 12  are arrayed above and below on the first voice coil portion  181 , similar to the case of the voice coil unit  18  in the configuration shown in  FIG. 13A , and the first voice coil line pattern  188  is configured by the line patterns L 11  and L 12 . Also, the two line patterns L 21  and L 22  are arrayed above and below on the second voice coil portion  182 , and the second voice coil line pattern  189  is configured by the line patterns L 21  and L 22 . 
     The damper member  19  shown in  FIG. 10  is formed by extrusion molding of resin, and has a damper main unit  190  formed in a wave form, a first supporting unit  191   a  formed in an arch shape that follows one of the outer side edge portions of the damper main unit  190 , and a second supporting unit  191   b  formed in an arch shape that follows the other outer side edge portion of the damper main unit  190 . A first fitting groove  192   a  is formed in the border portion of the damper main unit  190  and the first supporting unit  191   a  so as to extend in the lengthwise direction, and a second fitting groove  192   b  is formed in the border portion of the damper main unit  190  and the second supporting unit  191   b  so as to extend in the lengthwise direction. 
     The diaphragm  21  shown in  FIG. 11  is formed with a material such as resin, metal, paper, or the like, and has a diaphragm main unit  210  that is in a slightly bent state and a first slide unit  211  and a second slide unit  212  that slide and fit into the first fitting groove  192   a  and the second fitting groove  192   b  of the damper member  19  on both outer edges of the diaphragm main unit  210 . 
     The first horizontal edge portion  22   a  and the second horizontal edge portion  22   b  shown in  FIG. 12  are formed with a resin or the like, and as described above, has outer frame units  161   a  and  161   b  of the first positioning member  16   a  and the second positioning member  16   b , and edge engaging portions  221   a  and  221   b  that engage so as to link to the first vertical edge portion  20   a  and the second vertical edge portion  20   b  that are fixed in the first outer edge portion  174  and the second outer edge portion  175  on both end portions in the lengthwise direction of the rectangular-shaped frame unit formed by the first outer edge portion  174  and the second outer edge portion  175  of the frame member  17  linking together. Also, edge cover portions  222   a  and  222   b  that fill in the spaces between the diaphragm  19  are formed so as to extend over the inner side of the edge engaging portions  221   a  and  221   b.    
     The parts configured as described above (see  FIGS. 3 through 12 ) are assembled as follows, whereby the speaker device  10  shown in  FIG. 1  can be formed. 
     As shown in  FIG. 14 , a magnetic plate  12  is layered over a second inner yoke  13 , and further, as shown in  FIG. 15 , a first inner yoke  11  is layered over the magnetic plate  12 , whereby the magnetic plate  12  is sandwiched between the first inner yoke  11  and the second inner yoke  13 . Note that at this time, the magnetic plate  12  is in a demagnetized state. Next, as shown in  FIG. 16 , the first inner yoke  11  and the second inner yoke  13  which are in the state of sandwiching the magnetic plate  12  are subjected to positioning by the first positioning member  16   a  and the second positioning member  16   b . Specifically, the positioning protrusion  111  of the first inner yoke  11  is subjected to positioning by the inner face  162   aa  of the first horizontal spacer unit  162   a  and the first positioning face  164   aa  of the vertical spacer unit  164   a  (see  FIG. 6A ), in the state of being sandwiched between the first horizontal spacer unit  162   a  and the protruding portion  165   a  of the vertical spacer unit  164   a  of the first positioning member  16   a , and the positioning protrusion  112  of the first inner yoke  11  is subjected to positioning by the inner face  163   aa  of the second horizontal spacer unit  163   a  and the second positioning face  164   ab  of the vertical spacer unit  164   a  (see  FIG. 6A ), in the state of being sandwiched between the second horizontal spacer unit  163   a  and the protruding portion  166   a  of the vertical spacer unit  164   a  of the first positioning member  16   a . Also, the positioning protrusion  113  of the first inner yoke  11  is subjected to positioning by the inner face  163   ba  of the second horizontal spacer unit  163   b  and the second positioning face  164   bb  of the vertical spacer unit  164   b  (see  FIG. 6B ), in the state of being sandwiched between the second horizontal spacer unit  163   b  and the protruding portion  166   b  of the vertical spacer unit  164   b  of the second positioning member  16   b , and the positioning protrusion  114  of the first inner yoke  11  is subjected to positioning by the inner face  162   ba  of the first horizontal spacer unit  162   b  and the first positioning face  164   ba  of the vertical spacer unit  164   b  (see  FIG. 6B ), in the state of being sandwiched between the first spacer unit  162   b  and the protruding portion  165   b  of the vertical spacer unit  164   b  of the second positioning member  16   b.    
     Further, although not clearly shown in  FIG. 16 , the second inner yoke  13  is also subjected to positioning by the first positioning member  16   a  and the second positioning member  16   b , similar to the first inner yoke  11 . That is to say, the positioning protrusion  131  of the second inner yoke  13  is subjected to positioning by the inner face  162   aa  of the first horizontal spacer unit  162   a  and the lower face of the vertical spacer unit  164   a  in the first positioning member  16   a  (see  FIG. 6A ), and the positioning protrusion  132  of the second inner yoke  13  is subjected to positioning by the inner face  163   aa  of the second horizontal spacer unit  163   a  and the lower face of the vertical spacer unit  164   b  in the first positioning member  16   a  (see  FIG. 6A ). Also, the positioning protrusion  133  of the second inner yoke  13  is subjected to positioning by the inner face  163   ba  of the second horizontal spacer unit  163   b  and the lower face of the vertical spacer unit  164   b  in the second positioning member  16   b , and the positioning protrusion  134  of the second inner yoke  13  is subjected to positioning by the inner face  162   ba  of the first horizontal spacer unit  162   b  and the lower face of the vertical spacer unit  164  in the second positioning member  16   b.    
     Thus, the first inner yoke  11  and the second inner yoke  13  having sandwiched the magnetic plate  12  are subjected to positioning in the horizontal direction by the first positioning member  16   a  and the second positioning member  16   b , and the spacing between the first inner yoke  11  and the second inner yoke  13  is maintained at a thickness of the vertical spacer units  164   a  and  164   b  (corresponding to the thickness of the magnetic plate  12 ). 
     In such a state, as shown in  FIG. 17 , the first outer yoke  14  is pushed against the first horizontal spacer unit  162   a  of the first positioning member  16   a  and the second horizontal spacer unit  163   b  of the second position determining member  16   b , and the second outer yoke  15  is pushed against the second horizontal spacer unit  163   a  of the first position determining member  16   a  and the first horizontal spacer unit  162   b  of the second positioning member  16   b . Thus, the space between each of the positioning protrusions  111 ,  113 ,  131 , and  133  of the first inner yoke  11  and the second inner yoke  13  and the plate face of the first outer yoke  14  is held at a spacing equivalent to the width of the first horizontal spacer unit  162   a  of the first positioning member  16   a  and the second horizontal spacer unit  163   b  of the second positioning member  16   b , and the space between each of the positioning protrusions  112 ,  114 ,  132 , and  134  of the first inner yoke  11  and the second inner yoke  13  and the plate face of the second outer yoke  15  is held at a spacing equivalent to the width of the second horizontal spacer unit  163   a  of the first positioning member  16   a  and the first horizontal spacer unit  162   b  of the second positioning member  16   b . Consequently, as shown in the details of  FIG. 2  as well as  FIG. 17 , a magnetic gap Gp is formed between the plate face of the first outer yoke  14  and one of the side end faces of each of the first inner yoke  11  and the second inner yoke  13 , and a magnetic gap Gp is formed between the plate face of the second outer yoke  15  and the other side end face of each of the first inner yoke  11  and the second inner yoke  13 . 
     Next, the first inner yoke  11  and the second inner yoke  13  subjected to positioning by the first positioning member  16   a  and the second positioning member  16   b  in the state of sandwiching the magnetic plate  12 , and the first outer yoke  14  and the second outer yoke  15 , are contained within the frame member  17 , as shown in detail in  FIG. 2  as well as in  FIG. 18 . The floor portion  171  of the frame member  17  presses the second inner yoke  13  against the vertical spacer units  164   a  and  164   b  of the first positioning member  16   a  and the second positioning member  16   b , and the first pressing unit  172  and the second pressing unit  173  of the frame member  17  sandwiches the first outer yoke  14  and the second outer yoke  15 , whereby the first outer yoke  14  is pressed by the first horizontal spacer unit  162   a  of the first positioning member  16   a  and the second horizontal spacer unit  163   b  of the second position determining unit  16   b , and the second outer yoke  15  is pressed by the second horizontal spacer unit  163   a  of the first positioning member  16   a  and the first spacer unit  162   b  of the second positioning member  16   b . Thus, the magnetic plate  12 , the first inner yoke  11 , the second inner yoke  13 , the first outer yoke  14 , and the second outer yoke  15  which make up the magnetic circuit are integrated along with the first positioning member  16   a  and the second positioning member  16   b.    
     The ends of the first outer edge portion  174  of the frame member  17  engage with one end of the outer frame unit  161   a  of the first positioning member  16   a  and one end of the outer frame unit  161   b  of the second positioning member  16   b , and the ends of the second outer edge portion  175  of the frame member  17  engage with the other end of the outer frame unit  161   a  of the first positioning member  16   a  and the other end of the outer frame unit  161   b  of the second positioning member  16   b . Thus, the magnetic circuit made up of the magnetic plate  12 , the first inner yoke  11 , the second inner yoke  13 , the first outer yoke  14 , and the second outer yoke  15  is surrounded by a frame unit that is made up of the first outer edge portion  174  and the second outer edge portion  175  of the frame member  17 , the outer frame unit  161   a  of the first positioning member  16   a , and the outer frame unit  161   b  of the second positioning member  16   b.    
     Next, as shown in  FIG. 19 , the voice coil unit  18  is set in the above-described magnetic circuit (see  FIG. 9 ). Specifically, a first voice coil portion  181  of the voice coil unit  18  is disposed within a magnetic gap Gp which is formed between one of the side end faces of each of the first inner yoke  11  and the second inner yoke  13  and the plate face of the first outer yoke  14 , and a second voice coil portion  182  is disposed within a magnetic gap Gp which is formed between the other side end faces of each of the first inner yoke  11  and the second inner yoke  13  and the plate face of the second outer yoke  15  (see  FIG. 2 ). A first terminal unit  185   a  is fixed to a terminal set face  167   a  between the two protruding portions  165   a  and  166   a  of the vertical spacer unit  164   a  (see  FIG. 6A ) in the first positioning member  16   a , and a second terminal unit  185   b  is fixed to a terminal set face  167   b  between the two protruding portions  165   b  and  166   b  of the vertical spacer unit  165   b  (see  FIG. 6B ) in the second positioning member  16   b . In this state, the first voice coil unit  181  that is disposed within the magnetic gap Gp which is formed between one side end face of each of the first inner yoke  11  and the second inner yoke  13  and the plate face of the first outer yoke  14  has both end portions elastically supported by the first-first supporting unit  183   a  that is in a shape bent so as to extend up from the first terminal portion  185   a  and bend down, and a second-first supporting unit  183   b  that is in a shape bent so as to extend up from the second terminal portion  185   b  and bend down, and can vibrate within the magnetic gap Gp in the direction of the face thereof (vertical vibration). Also, the second voice coil unit  182  that is disposed within the magnetic gap Gp which is formed between the other side end face of each of the first inner yoke  11  and the second inner yoke  13  and the plate face of the second outer yoke  15  has both end portions elastically supported by the first-second supporting unit  184   a  that is in a shape bent so as to extend up from the first terminal portion  185   a  and bend down, and a second-second supporting unit  184   b  that is in a shape bent so as to extend up from the second terminal portion  185   b  and bend down, and can vibrate within the magnetic gap Gp in the direction of the face thereof (vertical vibration). 
     Note that as shown in  FIG. 2 , the line pattern L 11  of a first voice coil line pattern  186  ( 188 ) formed in the first voice coil portion  181  is arrayed between one of the side end faces of the first inner yoke  11  and the plate face of the first outer yoke  14 , and the line pattern L 12  of the first voice coil line pattern  186  ( 188 ) is arrayed between one of the side end faces of the second inner yoke  13  and the plate face of the first outer yoke  14 . Also, the line pattern L 21  of a second voice coil line pattern  187  ( 189 ) formed in the second voice coil portion  182  is arrayed between the other side end face of the first inner yoke  11  and the plate face of the second outer yoke  15 , and the line pattern L 22  of the second voice coil line pattern  187  ( 189 ) is arrayed between the other side end face of the second inner yoke  13  and the plate face of the second outer yoke  15 . 
     Next, as shown in  FIG. 20 , a damper member  19  is attached. A first vertical edge portion  20   a  following a first supporting unit  191   a  that is formed on one of the outer edge portions of the damper member  19  is fixed to the first outer edge portion  174  of the frame member  17 , and a second vertical edge portion  20   b  following a second supporting unit  191   b  that is formed on the other outer edge portion of the damper member  19  is fixed to the second outer edge portion  175  of the frame member  17  (see  FIG. 2 ). Thus, the damper member  19  is provided between the first outer edge portion  174  and second outer edge portion  175  of the frame member  17  so as to cover the magnetic circuit and the voice coil unit  18 . 
     Fixing the damper member  19  to the frame member  17  is performed, specifically, by sliding to fit the first fitting groove  20   aa  of the first vertical edge unit  20   a  onto the first outer edge portion  174  of the frame member  17 , and similarly sliding to fit the second fitting groove  20   ba  of the second vertical edge unit  20   b  onto the second outer edge portion  175  on the opposite side of the frame member  17 , as shown expanded in  FIG. 21 . 
     When the damper member  19  is attached, the leading edge portion of the first voice coil portion  181  extruding from the magnetic gap Gp is fixed to the border portion between the damper main unit  190  and the first supporting unit  191   a  (the portion forming the first fitting groove  192   a ) with an adhesive agent, as shown in  FIG. 2 . Also, the leading edge portion of the second voice coil portion  182  extruding from the magnetic gap Gp is fixed to the border portion between the damper main unit  190  and the second supporting unit  191   b  (the portion forming the second fitting groove  192   b ) with an adhesive agent. Thus, the entire voice coil unit  18  is elastically supported by the damper member  19 . 
     Next, as shown in  FIG. 22 , the diaphragm  21  is attached to the damper member  19 . Specifically, as shown expanded in  FIG. 23  as well as  FIG. 21 , a first sliding unit  211  of the diaphragm  21  is slid to fit into the first fitting groove  192   a  formed in the border portion between the damper main unit  190  and the first supporting unit  191   a . Also, a second sliding unit  212  of the diaphragm  21  is similarly slid to fit into the second fitting groove  192   b  formed in the border portion between the damper main unit  190  and the second supporting unit  191   b . Thus, the diaphragm  21  is fixed to the damper member  19  (damper main unit  190 ). Also, as described above, the leading end portion of the first voice coil portion  181  of the voice coil unit  18  is adhered to the border portion between the damper main unit  190  and the first supporting unit  191   a  with an adhesive agent, and also, the leading end portion of the second voice coil portion  182  of the voice coil unit  18  is adhered to the border portion between the damper main unit  190  and the second supporting unit  191   b  with an adhesive agent (see  FIG. 2 ), whereby the voice coil unit  18  (first voice coil portion  181 , second voice coil portion  182 ) are constructed to link to the diaphragm  21 , and the vibrations of the voice coil unit  18  transmit to the diaphragm  21 . 
     Lastly, as shown in  FIG. 1 , the first horizontal edge portion  22   a  and the second horizontal edge portion  22   b  are attached, and the assembly of the various parts is ended. Specifically, the outer frame portions  161   a  and  161   b  of the first positioning member  16   a  and the second positioning member  16   b  and the first outer edge unit  174  and the second outer edge unit  175  of the frame member  17  are linked to form a rectangular-shaped frame (see  FIG. 22 ). The edge engaging portion  221   a  of the first horizontal edge unit  22   a  is fixed to the end portion on the outer frame unit  161   a  side of the first positioning member  16   a  of this frame, and the edge engaging portion  221   b  of the second horizontal edge unit  22   b  is fixed to the end portion on the outer frame unit  161   b  side of the second positioning member  16   b  of the frame. Thus, the edge engaging portions  221   a  and  222   a  are linked to the first vertical edge portion  20   a  and the second vertical edge portion  20   b , and the edge cover units  222   a  and  222   b  link to the diaphragm  21  and the end edge of the damper member  19  (first supporting unit  191   a  and second supporting unit  191   b ). 
     When the various parts are thus assembled, the magnetic plate is magnetized. When the magnetic plate  12  is magnetized, the first inner yoke  11 , the second inner yoke  13 , the first outer yoke  14 , and the second outer yoke  15  are drawn to the magnetic plate  12 , and these are strongly integrated along with the first positioning member  16   a  and the second positioning member  16   b . However, it should be noted that the magnetic gap Gp between one of the side end faces of each of the first inner yoke  11  and the second inner yoke  13  and the plate face of the first outer yoke  14 , and the magnetic gap Gp between the other side end faces of each of the first inner yoke  11  and the second inner yoke  13  and the plate face of the second outer yoke  15  are accurately maintained by the first positioning member  16   a  and the second positioning member  16   b.    
     Note that the parts that are assembled as described above may be adhesively fixed with an adhesive agent as needed before the magnetic plate  12  is magnetized. 
     The electrical connection with the audio signal output circuit of the voice coil unit  18  is as shown in  FIGS. 24A and 24B . Note that  FIGS. 24A and 24B  show an expanded view of the configuration of the second terminal unit  185   b  of the voice coil unit  18 , and the first terminal unit  185   a  of the voice coil unit  18  has the same configuration. Note that in this case, a voice coil line pattern (first voice coil line pattern  188 , second voice coil line pattern  189 ) such as shown in  FIG. 13B , for example, is formed in the first voice coil portion  181  and the second voice coil portion  182  of the voice coil unit  18 . 
     In  FIG. 24A , in the U-shape formed by the two protruding portions  165   b  and  166   b  and the terminal set face  167   b  of the vertical spacer unit  164   b  of the second positioning member  16   b  (fixed position), the second terminal unit  185   b  is set in the border portion between the second-first supporting unit  183   b  following the first voice coil portion  181  and the second-second supporting portion  184   b  following the second voice coil portion  182 . A pair of connecting points C of the second voice coil line pattern  189  are formed on the second terminal unit  185   b  so as to be exposed. A coupler terminal  30  is connected to the leading edge of a lead line  31  extending from the audio signal output circuit. The coupler terminal  30  is made of resin and has an exterior shape that matches the U-shaped second terminal unit  185   b  of the voice coil unit  18 . As shown in  FIG. 24B , when the coupler terminal  30  is inserted into the second terminal unit  185   b  that is set in a U-shape formed with the two protruding portions  165   b  and  166   b  and the terminal set face  167   b  of the vertical spacer unit  164   b  of the second positioning member  16   b , a connecting point (not shown) that becomes a pair following the lead line  31  of the coupler terminal  30  is pressed to make contact with the connecting points C of the second terminal unit  185   b . Thus, the lead line  31  and the second voice coil line pattern  189  are electrically connected, and the audio signal supplied from the audio signal output circuit through the lead line  31  is supplied to the second voice coil line pattern  189  via the connecting points C of the second terminal unit  185   b.    
     As described above, although the first terminal unit  185   a  on the opposite side from the second terminal unit  185   b  of the voice coil unit  18  is not shown in  FIGS. 24A and 24B , similar to the case of the second terminal unit  185   b , a coupler terminal connected to the lead line is also inserted into the first terminal unit  185   a  that is set in a U-shape formed with the two protruding portions  165   a  and  166   a  and the terminal set face  167   a  of the vertical spacer unit  164   a  of the first positioning member  16   a . Thus, the audio signal supplied from the audio signal output circuit through the lead line  31  is supplied to the first voice coil line pattern  188  formed on the first voice coil portion  181  via the connecting points of the first terminal unit  185   a.    
     The same audio signal can be supplied in parallel to the first voice coil line pattern  188  formed in the first voice coil portion  181  and the second voice coil line pattern  189  formed in the second voice coil portion  182 . Also, audio signals of frequency features (e.g., for higher sounds and for lower sounds) that differ for the first voice coil line pattern  188  and the second voice coil line pattern  189  can be supplied. Further, audio signals (e.g. vocal audio and instrumental audio) that differ for the first voice coil line pattern  188  and the second voice coil line pattern  189  can be supplied. 
     Note that even in a case that a voice coil line pattern (first voice coil line pattern  186 , second voice coil line pattern  187 ) such as shown in  FIG. 13A , for example, is formed in the first voice coil portion  181  and the second voice coil portion  182  of the voice coil unit  18 , by fitting a similar coupler terminal into the first terminal unit  185   a  or the second terminal unit  185   b  of the voice coil unit  18 , audio signals can be supplied to the first voice coil line pattern  186  and the second voice coil line pattern  187  via the two pairs of connecting points. Note that a dummy coupler terminal can be inserted into a first terminal unit  185   a  or a second terminal unit  185   b  to which audio signals are not supplied. 
     A magnetic flux is generated, as shown in  FIG. 25 , in the magnetic circuit (magnetic plate  12 , first inner yoke  11 , second inner yoke  13 , first outer yoke  14 , and second outer yoke  15 ). In  FIG. 25 , the magnetic flux from the North pole side of the magnetic plate  12  travels from one side face of the first inner yoke  11 , cuts across the magnetic gap Gp, arrives at the first outer yoke  14 , and the magnetic flux having passed through the first outer yoke  14  travels from the first outer yoke  14 , cuts across the magnetic gap Gp, arrives at one side end face of the second inner yoke  13 , and returns to the South pole side of the magnetic plate  12 . Also, the magnetic flux from the North pole side of the magnetic plate  12  travels from the other side end face of the first inner yoke  11 , cuts across the magnetic gap Gp, arrives at the second outer yoke  15 , and the magnetic flux having passed through the second outer yoke  15  travels from the second outer yoke  15 , cuts across the magnetic gap Gp, arrives at the other side end face of the second inner yoke  13 , and returns to the South pole side of the magnetic plate  12 . 
     An audio signal is supplied to the first voice coil line pattern  186  (L 11 , L 12 ) and the second voice coil line pattern  187  (L 21 , L 22 ) of the voice coil unit  18  via the coupler terminal  30  in the state that the magnetic flux is formed in the magnetic circuit as shown in  FIG. 25 . In  FIG. 25 , the magnetic flux that cuts across the magnetic gap Gp formed between one of the side end faces of the first inner yoke  11  and the plate face of the first outer yoke  14 , and the magnetic flux that cuts across the magnetic gap Gp formed between one of the side end faces of the second inner yoke  13  and the plate face of the first outer yoke  14 , go in opposite directions, but the direction of the audio current flowing between the line pattern L 11  and the line pattern L 12  of the first voice coil line pattern  186  arrayed within each magnetic gap Gp also goes in opposite directions, whereby within the face of the first voice coil portion  181 , force acts in the same direction on the line pattern L 11  and line pattern L 12  by mutual action of the magnetic flux within the magnetic gap Gp and the audio signal current, and the first voice coil portion  181  vibrates in the direction of the face thereof (vertical direction) Dv according to the audio signal. 
     Also, in  FIG. 25 , the magnetic flux that cuts across the magnetic gap Gp formed between the other side end face of the first inner yoke  11  and the plate face of the second outer yoke  15 , and the magnetic flux that cuts across the magnetic gap Gp formed between the other side end face of the second inner yoke  13  and the plate face of the second outer yoke  15 , similarly go in opposite directions. In this case also, the direction of the audio current flowing between the line pattern L 21  and the line pattern L 22  of the second voice coil line pattern  187  arrayed within each magnetic gap Gp also goes in opposite directions, whereby force operates in the same direction within the face of the second voice coil unit  182  on the line pattern L 21  and line pattern L 22  by the mutual action of the magnetic flex within the magnetic gap Gp and the audio signal current, and the second voice coil portion  182  vibrates according to the audio signal, similar to the first voice coil portion  181 , in the face direction thereof (vertical direction) Dv. 
     With the vertical direction Dv vibrations of the first voice coil portion  181  and the second voice coil portion  182  according to the audio signal, the diaphragm  21  which is linked to the voice coil portions  181  and  182  vibrates according to the audio signal. Consequently, sound corresponding to the audio signal is output. 
     With the speaker device  10  according to the first embodiment as described above, the first-first supporting unit  183   a  and the second-first supporting unit  183   b  following the first voice coil portion  181  and the first-second supporting unit  184   a  and the second-second supporting unit  184   b  following the second voice coil portion  182  are formed so as to be continuous, whereby the first voice coil portion  181 , the second voice coil portion  182 , the first-first supporting unit  183   a , the second-first supporting unit  183   b , the first-second supporting unit  184   a , the second-second supporting unit  184   b , the first terminal unit  185   a , and the second terminal unit  185   b  can be made of a single flat piece of flexible material, and the configuration of the voice coil unit  18  can become simpler. 
     Also, the first-first supporting unit  183   a  and the first-second supporting unit  184   a  that follow from one end portion of the first voice coil portion  181  and the second voice coil portion  182  elastically support one end portion of the first voice coil portion  181  and the second voice coil portion  182  in a shape bent so as to extend up from the first terminal unit  185   a  which is fixed to the first positioning member  16   a , and to bend down, and the second-first supporting unit  183   b  and the second-second supporting unit  184   b  that follow from the other end portion of the first voice coil portion  181  and the second voice coil portion  182  elastically support the other end portion of the first voice coil portion  181  and the second voice coil portion  182  in a shape bent so as to extend up from the second terminal unit  185   b  which is fixed to the second positioning member  16   b , and to bend down, whereby in the event that the first voice coil portion  181  and the second voice coil portion  182  vibrate within the magnetic gap Gp in the direction of the faces thereof, each of the first-first supporting unit  183   a  and the second-first supporting unit  183   b  are subject to the bent shape being deformed in accordance with the vibrations of the first voice coil portion  181  while the vibrations of the first voice coil portion  181  are maintained, and also, each of the first-second supporting unit  184   a  and the second-second supporting unit  184   b  are subject to the bent shape being deformed in accordance with the vibrations of the second voice coil portion  182  while the vibrations of the second voice coil portion  182  are maintained. 
     Thus, in the event of the first voice coil portion  181  and the second voice coil portion  182  vibrating within the magnetic gap Gp in the face directions thereof, each of the first-first supporting unit  183   a  and the second-first supporting unit  183   b  and the first-second supporting unit  184   a  and the second-second supporting unit  184   b  are subject to the bent shape being deformed in accordance with the vibrations of the first and second voice coil portions  181  and  182  while the vibrations of the first voice coil portions  181  and  182  are maintained, whereby in the amount that the bent shape of the various supporting units  183   a ,  183   b ,  184   a , and  184   b  are deformed, the amplitude of the vibrations of the first and second voice coil portions  181  and  182  that are elastically supported can be increased. Accordingly, the voice coil unit  18  (first voice coil portion  181 , second voice coil portion  182   a ) can vibrate with a greater amplitude. 
     Also, in the magnetic circuit, the positioning of the first inner yoke  11 , the second inner yoke, the first outer yoke  14 , and the second outer yoke  15  are determined by the first positioning member  16   a  and the second positioning member  16   b  so that the magnetic gap Gp is formed, and the magnetic plate  12 , the first inner yoke  11 , the second inner yoke  13 , the first outer yoke  14 , and the second outer yoke  15  are in an integrated configuration, whereby the magnetic circuit can be assembled with good workability by the first positioning member  16   a  and the second positioning member  16   b . Further, other parts are attached to the first positioning member  16   a  and the second positioning member  16   b , specifically, the frame member  17 , the voice coil unit  18 , and the first horizontal edge portion  22   a  and the second horizontal edge portion  22   b , whereby assembly workability is further improved. 
     Also, an electrical connection with the audio signal output circuit of the voice coil unit  18  is made by the coupler terminal  30  that is fit into the first terminal unit  185   a  and the second terminal unit  185   b  of the voice coil unit  18  which has been set in the first and second positioning members  16   a  and  16   b  (see  FIGS. 24A and 24B ), whereby electrical connections thereof can be made without soldering. Laying of the lead lines as to the voice coil unit  18  becomes simpler, and assembly is easier. Further, unnecessary load, such as being pulled by the lead line to the voice coil unit  18 , can be prevented. 
     Note that with the speaker device according to the embodiment as described above, the first voice coil portion  181  and the second voice coil portion  182  are disposed in two magnetic gaps Gp (see  FIG. 2 ), but a magnetic circuit can be configured such that the voice coil portions  181  and  182  are disposed in a single magnetic gap Gp. In this case, the voice coil line pattern formed in each voice coil portion  181  and  182  is formed so as to be disposed within a single magnetic gap Gp. 
     Also, the voice coil unit  18  has the first voice coil portion  181  and the second voice coil portion  182  made of a single flat flexible board (see  FIGS. 13A and 13B ), but a configuration may be made wherein each are separately elastically supported. In this case, for example, the first-first supporting unit  183   a , the second-first supporting unit  183   b , the first-second supporting unit  184   a , and the second-second supporting unit  184   b  which elastically support the first voice coil portion  181  and the second voice coil portion  182  each may have the edge portion thereof fixed separately. 
     As described above, the speaker device according to the present invention is advantageous in that the voice coil unit can vibrate with a greater amplitude, and is useful as a speaker device that outputs sound by causing vibration of a diaphragm which is connected to a voice coil by mutual action between a magnetic field generated in a magnetic circuit and an audio signal current that flows through the voice coil. 
     While there has been illustrated and described what is at present contemplated to be preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made, and equivalents may be substituted for elements thereof without departing from the true scope of the invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the invention without departing from the central scope thereof. Therefore, it is intended that this invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.