Patent Publication Number: US-2007121990-A1

Title: Speaker device

Description:
BACKGROUND OF THE INVENTION  
      The present invention relates to a speaker device.  
      The present application claims priority from Japanese Application No. 2005-221811, the disclosure of which is incorporated herein by reference.  
      With regard to a conventional speaker device, a speaker terminal section electrically connected to a voice coil is formed in a speaker frame or the like, while a speaker cord is led out from the speaker terminal section. In order for the speaker cord not to get caught on other parts so as to avoid an unnecessary external force which can damage the speaker terminal section or the like, such a speaker cord is usually fixed in the speaker frame or the like. In fact, there are various methods which can be used to fix a speaker cord.  
      For example, Japanese Unexamined Patent Application Publication No. 6-44288 has disclosed a speaker device in which a speaker cord is fixed in a retaining section formed in a speaker frame by means of a string-like clamper member.  
      Moreover, a conventional speaker device  1 J shown in  FIGS. 1A and 1B  usually includes an attachment bracket  20 J provided as an additional item for attaching a speaker  100 J to an attachment base. Such attachment bracket  20 J has a cord clamping section  21 J, so that a speaker cord L 1  is tightly attached and thus fixed to the cord clamping section  21 J by means of a damper member  22 J.  
      With the speaker device mentioned above, although the speaker cord fixing means is formed in the speaker frame or the attachment bracket, it has been desired to provide a speaker device which can restrict a wiring position of a speaker cord using a simplified structure. Further, in order to reduce a cost and improve an operating efficiency when manufacturing a speaker device, it is desired to reduce the number of parts which are necessary for use in speaker cord fixation. Moreover, in order to improve an operating efficiency in speaker manufacturing, it is desired to produce a speaker device capable of easily improving an operating efficiency in fixing or detaching a speaker cord.  
     SUMMARY OF THE INVENTION  
      The present invention is to solve the aforementioned problem and makes this as one of its tasks. It is an object of the present invention to provide an improved speaker device capable of restricting a wiring position of a speaker cord using a simple structure, reducing the number of parts which are necessary for use in speaker cord fixation. Another object of the invention is to provide an improved speaker device capable of improving an operating efficiency when fixing and detaching a speaker cord.  
      In order to achieve the above objects, the present invention is characterized by at least the following aspect.  
      According to the present invention, there is provided a speaker device including a speaker unit and a frame structure having an attachment section for attaching the speaker unit to an attachment base. In particular, the frame structure has wiring position restricting means for restricting a wiring position of a speaker cord led out from the speaker unit on the frame structure. Further, the frame structure and the wiring position restricting means are formed into an integral body using an identical material. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      These and other objects and advantages of the present invention will become clear from the following description with reference to the accompanying drawings, wherein:  
       FIGS. 1A and 1B  are explanatory views showing a conventional speaker device, in which  FIG. 1A  is a side view and  FIG. 1B  is a perspective view showing an operation for attaching the conventional speaker device;  
       FIG. 2  is a front view showing a speaker device formed according to a first embodiment of the present invention;  
       FIG. 3  is an explanatory view showing a backside of the speaker device illustrated in  FIG. 2 ;  
       FIG. 4  is a side view of the speaker device illustrated in  FIG. 2 ;  
       FIG. 5  is a perspective view of the speaker device illustrated in  FIG. 2 ;  
       FIG. 6  is an explanatory view showing a wiring position of a speaker cord of the speaker device illustrated in  FIG. 2 ;  
       FIGS. 7A, 7B , and  7 C are perspective views showing several different types of cord fixing sections of the speaker device of the present invention, in which  FIG. 7A  shows a first example,  FIG. 7B  shows a second example, and  FIG. 7C  shows a third example;  
       FIG. 8  is an enlarged view showing an area around a fixing section  202 , illustrating an operation of fixing the speaker cord of the speaker device shown in FIGS.  2  to  6 ;  
       FIGS. 9A, 9B , and  9 C are sectional views each taken along A-A line in  FIG. 8 , showing an operation of fixing the speaker cord at the fixing section  202 ;  
       FIG. 10  is an explanatory view showing a conventional speaker device not having a convex portion  202   d  at an end of the fixing section  202 ;  
       FIG. 11  is a front view showing in detail a speaker device la formed according to a second embodiment of the present invention;  
       FIG. 12  is an explanatory view showing a backside of the speaker device la illustrated in  FIG. 11 ;  
       FIG. 13  is a sectional view taken along A-A line in  FIG. 11 ;  
       FIG. 14  is a perspective view showing a backside of the speaker device la illustrated in  FIG. 11 ;  
       FIG. 15  is an explanatory view showing a conventional speaker device not having any wiring position restricting means;  
       FIG. 16  is an enlarged view showing an area around a restricting section shown in  FIG. 12  and  FIG. 16 ; and  
       FIG. 17  is a side view showing the restricting section illustrated in  FIG. 16 . 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      The speaker device according to one embodiment of the present invention includes a speaker unit, a frame structure having an attachment section for attaching the speaker unit to an attachment base. The frame structure has an attachment section for attaching the speaker unit to an attachment base, wiring position restricting means for restricting the wiring position of a speaker cord led out from the speaker unit, on the frame structure by virtue of a damper member. The frame structure and the wiring position restricting means are formed by an identical material such as resin or metal.  
      Since the speaker device having the afore-mentioned structure is provided with wiring position restricting means consisting of a resin or a metal and formed integrally with the frame structure, it becomes possible to restrict the wiring position of the speaker cord using a simplified structure, and to reduce the number of parts necessary for use in speaker cord fixation.  
      In the following, description will be given to explain an embodiment of the present invention with reference to the accompanying drawings.  
     First Embodiment  
       FIG. 2  is an explanatory view showing a speaker device formed according to a first embodiment of the present invention. In detail,  FIG. 2  is a front view of the speaker device  1 .  FIG. 3  is an explanatory view showing a backside of the speaker device illustrated in  FIG. 2 .  FIG. 4  is a side view of the speaker device shown in  FIG. 2 .  FIG. 5  is a perspective view of the speaker device shown in  FIG. 2 . Although the following description is based on a dome type speaker device, this should not form any limitation to the present invention. In fact, the present invention can be applied to various other types of speaker devices including a cone type, a horn type, and a flat type or the like. Moreover, even with a dome type speaker unit, there can be various types of configurations and the present invention should not be limited to the following description. Besides, although the following description is based on a vehicle speaker device, this should not form any limitation to the present invention, either. In fact, the present invention can be applied to any speaker devices to be attached to any desired attachment bases.  
      As shown in FIGS.  2  to  5 , the speaker device  1  of the present embodiment of the present invention has a speaker unit  100  and a speaker frame structure  20 .  
      The speaker unit  100  comprises: a magnetic circuit consisting of a plate, a permanent magnet, and a yoke; a voice coil positioned in a magnetic gap formed between the plate and the yoke and driven by an electric signal supplied hereto; a voice-coil bobbin wound around by the voice coil; and a diaphragm. Moreover, as shown in  FIG. 3 , a speaker terminal section  101  connected with the voice coil is formed on the backside of the speaker unit  100 .  
       FIG. 6  is an explanatory view showing a wiring position of a speaker cord of the speaker device illustrated in  FIG. 2 . As shown in  FIG. 6 , there have been arranged a speaker cord (electrically conductive wire) L 1  in a manner such that one end of the cord is electrically connected to the speaker terminal section  101  while the other end thereof is connected to a connector terminal  40 . When an electrical signal is supplied to the voice coil through the speaker terminal section  101 , the voice-coil bobbin will be driven, thereby effecting a vibration of a vibrating member such as the diaphragm.  
      The frame structure  20  may be formed of a predetermined material such as resin or metal. In the present embodiment, the frame structure  20  is formed of a resin material. As shown in  FIGS. 2-5 , the frame structure  20  is formed to cover at least the side wall of the speaker unit  100 . In detail, the frame structure  20  has an attachment section  201  and a speaker cord fixing section  202 . Here, the cord fixing section  202  serves as an embodiment of wiring position restricting means or speaker cord fixing means in the present invention.  
      The attachment section  201  is a convex portion formed on the side wall of the frame structure  20  for attaching the speaker unit to an attachment base. The cord fixing section  202  serves as wiring position restricting means for restricting the wiring position of the speaker cord L 1  led out from the speaker unit, with respect to the frame structure  20 . In more detail, as shown in FIGS.  2  to  5 , the cord fixing section  202  which is protruding outwardly is formed on the side wall of the frame structure  20 , while the speaker cord L 1  is fixed on the fixing section  202 . In the present embodiment, the speaker cord L 1  is tightly fixed on the fixing section  202  by means of an attachment member such as a string-like clamper. In practice, such fixing section  202  may be formed into a predetermined shape like a plate or a rod. In the present embodiment, the fixing section  202  is a plate-like member formed on the side wall of the frame-structure  20 . Further, such fixing section  202  has drop-preventing means for preventing the damper from dropping down. For example, as shown in FIGS.  2  to  5 , the fixing section  202  has a through hole  202   a  formed in the central portion thereof, a notch  202   b  formed in an edge portion of the fixing section, a reinforcing rib  202   c  formed between the through hole  202   a  and the notch  202   b , and a convex portion  202   d  formed near an edge of the fixing section  202  and serving as the drop-preventing means. Namely, the fixing section  202  has a generally L-shaped member for preventing the dropping of the clamper. In fact, the fixing section  202  can have any desired shape, provided that it can be engaged by the damper having the above-described configuration, so that the damper will not drop from the fixing section  202 .  
       FIGS. 7A  to  7 C are perspective views showing several examples of a fixing section of a speaker device formed according to the present invention. In detail,  FIG. 7A  shows a first example,  FIG. 7B  shows a second example, and  FIG. 7C  shows a third example. As shown in  FIG. 7A , the fixing section  202  is allowed to have notches  301  which allow an engagement of the damper member on both edge portions of the plate-like fixing section  202 . Alternatively, as shown in  FIG. 7B , the fixing section  202  is allowed to have two through holes  302  which allow an insertion of the damper member near the center of the plate-like fixing section  202 . As a third example, as shown in  FIG. 7C , the fixing section  202  is allowed to have a through hole  302  near the central portion thereof and a drop-preventing convex portion  202   d  on a corner of the plate-like fixing section  202 .  
       FIG. 8  is an explanatory perspective view showing an operation for fixing a speaker cord of the speaker device illustrated in FIGS.  2  to  6 . Actually,  FIG. 8  is an enlarged view showing an area around the fixing section  202 .  FIGS. 9A  to  9 C are explanatory sectional views taken along A-A line in  FIG. 8 , showing an operation for fixing a speaker cord in the fixing section  202 . Next, description will be given to explain an operation for fixing the speaker cord in the fixing section  202 , with reference to FIGS.  2  to  6 ,  8  and  9 .  
      At first, the speaker cord L 1  led out from the speaker terminal section  101  formed on the backside of the speaker unit  100  is placed near the backside of the fixing section  202 . Preferably, the speaker cord is disposed in a manner such that it is in contact with the backside of the fixing section  202 . Then, the string-like damper member  5  is inserted through the through holes  202   a , thereby fixing the speaker cord L 1  in the fixing section  202  in a manner shown in  FIGS. 8, 9A  to  9 C by virtue of the damper  5  fitting in the notch  202   b  and the through hole  202   a.    
      At this time, as shown in  FIG. 10 , if no such convex portion  202   d  is formed at an edge of the fixing section  202 , there will be a possibility that the clamper member  5  will drop down. To avoid such a possibility, the fixing section  202  of the present invention has a convex portion  202   d  having a height which is larger than the thickness of the clamper member  5 , as shown in  FIGS. 4 and 5 . In this way, it is possible to prevent the clamper member  5  from dropping down. Besides, if no such convex portion  202   d  is formed at an edge of the fixing section  202 , there will be a possibility that the damper member  5  will be undesirably fixed in a bent state  5   a  near an edge of the fixing section  202 , as shown in  FIG. 10 . On the other hand, when the damper member  5  is returned to its normal position  5   b , a desired cord fixation will get loosed so that it becomes impossible to exactly fix the speaker cord. Such problem has been solved by virtue of the convex portion  202   d  formed at an edge of the fixing section  202  in the present embodiment of the present invention, as shown in  FIGS. 4 and 5 .  
      As describe above, the frame structure  20  has an attachment section  201  for attaching the speaker unit  100  to an attachment base, and a fixing section  202  (wiring position restricting means) for fixing the wiring position of the speaker cord L 1  led out from the speaker unit  100 , using the damper member  5  and thus effecting the fixation with respect to the frame structure  20 , with the frame structure and the wiring position restricting means formed by an identical material such as a resin or a metal. In this way, it is possible to restrict the wiring position of the speaker cord with a simpler configuration.  
      In a conventional speaker device, it is necessary to prepare, as an additional item, an attachment bracket having formed thereon a speaker cord fixing portion and to attach the bracket to the speaker unit. In the speaker device  1  of the present invention, since the frame structure  20  and the fixing section  202  are formed into an integral body, it is possible to reduce the number of parts necessary for fixing the speaker cord.  
      Moreover, since the fixing section  202  protruding outwardly is formed on the side wall of the frame structure  20 , and since the speaker cord L 1  led out from the speaker unit  100  is fixed at the fixing section by virtue of the clamper member  5 , it is possible to improve an operating efficiency when fixing the speaker cord. Besides, using the damper member  5  which is easily detachable, it is possible to improve an operating efficiency when the speaker cord L 1  is being removed.  
     Second Embodiment  
       FIG. 11  is an explanatory front view showing a speaker device la formed according to a second embodiment of the present invention.  FIG. 12  is a view showing a backside of the speaker device illustrated in  FIG. 11 .  FIG. 13  is a sectional view taken along A-A line in  FIG. 11 .  FIG. 14  is a perspective view showing a backside of the speaker device la illustrated in  FIG. 12 . Here, although the following description is given to explain a cone type speaker device, this should not form any limitation to the present invention. Further, even with regard to a cone type speaker device, the present invention should not be limited to a specific structure described below.  
      As shown in FIGS.  11  to  14 , the speaker device la according to the present embodiment has a speaker unit  100   a  and a speaker frame  20   a . The speaker unit  100   a  comprises: a magnetic circuit consisting of a speaker frame  10 , a plate  11  attached to the bottom of the speaker frame  10 , a permanent magnet  12 , and a yoke  13 ; a voice coil  14  positioned in a gap formed between the plate  11  and the yoke  13  and driven by an electric signal supplied hereto; a voice-coil bobbin  15  wound around by the voice coil  14 ; a damper  16  supporting the voice-coil bobbin  15  on the speaker frame  10 ; a diaphragm  17  having an inner perimeter supported by the voice-coil bobbin  15  and an outer perimeter supported through an edge portion  17 A of the diaphragm  17  by the outer periphery  10 A of the speaker frame  10 ; and a dust cap  17 B provided on the central portion of the diaphragm  17 . The outer periphery of the edge portion  17 A is air-tightly attached to the outer periphery  10 A of the speaker frame  10  by means of a gasket  18 . Further, the voice coil  14  is formed by wiring around the voice coil bobbin  15 . Such a wiring is connected, by way of a flexible wire, to a speaker terminal section  191  on a speaker terminal board  19  provided on the backside of the speaker frame  10 . In this way, when an electric signal is supplied to the voice coil  14  through the speaker terminal section  191 , the voice coil will be driven, thereby causing a vibration of the diaphragm  17 , the damper  16 , and the like.  
      The frame structure  20  is formed by a material which may be resin, metal or the like. In the present embodiment, the frame structure  20  is formed by a resin. As shown in FIGS.  11  to  14 , the frame structure  20  is formed along the outer periphery of the speaker frame  10  of the speaker unit  100   a . In detail, the frame structure  20  has attachment portions  21  and a speaker attaching hole (attachment hole)  22 . The attachment portions  21  are used to attach the frame structure to an attachment base. Here, as shown in FIGS.  11  to  14 , the attachment portions  21  include a plurality of arms  211  and  212  having holes  211 a and  212   a  which allow an insertion of the fixing members such as screws for fixing the frame structure  20  on to an attachment base. The attachment hole  22  is an opening for fitting the speaker unit  100   a , so that the speaker unit  100   a  can be fitted in the opening and fixed in the frame structure  20 .  
      Moreover, as shown in  FIGS. 12 and 14 , the speaker device la is formed in a manner such that the speaker terminal board  19  mounting the speaker terminal section  191  is formed on the backside of the speaker frame  10 , while the frame structure  20  is provided with an electronic element attachment section  24  near the attachment hole  22  for attaching an electronic element  30  which controls an electrical signal being inputted into the speaker unit  100   a . In the present embodiment, the speaker terminal board  19  has a plurality of speaker terminal units  1911 ,  1912 . Further, as shown in  FIGS. 12 and 14 , the electronic element attachment section  24  has an electrically conductive terminal section (metallic terminal section)  241  including two metallic terminals  2411  and  2412 .  
      Moreover, the frame structure  20  has a cord fixing section for fixing a part of the speaker cord L 1  led out from the speaker unit  100   a  at a predetermined position separated a predetermined distance from the speaker unit  100   a . In detail, as shown in  FIGS. 12 and 14 , the frame structure  20  has a connector terminal attachment section  25  for fixing a connector terminal  40  formed at one end of the speaker cord L 1  led out from the speaker unit  100   a  at a position separated a predetermined distance from the speaker unit  100   a . The connector terminal attachment section  25  of the present embodiment is a plate-like member having a longitudinal portion arranged in a predetermined direction with respect to the speaker unit  100   a  and having a predetermined length. An engagement hole  251  formed near one end of the connector terminal attachment section  25  is engaged by an engaging portion  41  formed at one end of the connector terminal  40 , thereby fixing the connector terminal  40  in the frame structure  20 . Moreover, the engaging portion  41  has a retaining member  41   a  serving as dislocation preventing means. As shown in  FIGS. 12 and 14 , the connector terminal  40 , the speaker terminal section  191 , and the electronic element  30  are suitably electrically connected by virtue of the speaker cord (electrically conductive wire) L 1 .  
      Moreover, the frame structure  20  has a relay section (wiring position restricting means)  26  for restricting the wiring position of the speaker cord L 1 . As shown in  FIGS. 12 and 14 , the relay section  26  of the present embodiment has a plurality of relay units  260  to  263 . The first relay unit  260  is formed near the metallic terminal  241 , the second and third relay units  261  and  262  are formed near the metallic terminal  241  and the speaker terminal section  191 , and the fourth relay unit  263  is formed near the speaker terminal section  191 , thereby respectively restricting the wiring position of the speaker cord L 1 . In more detail, grooves are formed in the first to fourth relay units  260  to  263  so that the speaker cord L 1  may be engaged in these grooves so as to be fixed.  
      On the other hand, if there is no such means for restricting the wiring position as shown in  FIG. 15 , the speaker cord L 1  disposed between the fourth relay unit  263  and the connector terminal  40  provided in the connector terminal attachment section  25  will be dislocated in z direction or x direction shown in  FIG. 15 , undesirably causing the speaker cord L 1  to get in contact with other elements, causing a possibility that other elements can bite into these cords.  
      Moreover, as shown in  FIGS. 12 and 14 , the frame structure  20  of the present embodiment has wiring position restricting means for restricting the wiring position of the speaker cord L 1  disposed between the fourth relay unit  263  and the connector terminal  40  provided in the connector terminal attachment section  25 . In more detail, restricting units  264  and  265  are provided between the speaker unit  100   a  and the connector terminal  40  fixed in the connector terminal attachment section  25  for restricting the wiring position in a direction generally perpendicular to the longitudinal direction of the speaker cord L 1 . The restricting units  264  and  265  are positioned at a predetermined interval between the speaker unit  100   a and the connector terminal  40  fixed in the connector terminal attachment section  25 , so as to restrict the wiring position of the speaker cord L 1  in mutually opposite directions which are all generally perpendicular to the longitudinal direction of the speaker cord L 1 .    
       FIG. 16  is an enlarged view showing an area around the restricting sections which have been shown in  FIGS. 12 and 14 .  FIG. 17  is a side view showing the restricting sections illustrated in  FIG. 16 . As shown, the frame structure  20  has an upwardly protruding (z direction) restricting section  265  located near the root portion of the connector terminal attachment section  25 , and an outwardly protruding L-shaped restricting section  264  located on the side wall of the connector terminal attachment section  25  at a position separated a predetermined distance from the restricting section  265 .  
      As shown in  FIG. 16 , the restricting section  264  includes a convex restricting portion  2641  protruding in an outward direction (x direction) from the side wall of the connector terminal attachment section  25 , and another restricting portion  2642  protruding in a downward direction (z direction) from an end of the restricting portion  2641 . Preferably, the restricting portion  2641  is formed at a position which is lower than or substantially equal to the height (z direction) of an upper surface portion  265   a  of the convex restricting portion  265 .  
      Next, description will be given to explain in detail an example in which the speaker cord L 1  is attached by wiring to the frame structure  20  when manufacturing a speaker device. Namely, at first, the engaging portion  41  of the connector terminal  40  is engaged in the engagement hole  251  of the connector terminal attachment section  25 , so that the connector terminal  40  itself can be attached to an end of the connector terminal attachment section  25 . In this way, the speaker cord L 1  can be led along the side wall of the connector terminal attachment section  25 , passing through the inner side of a bent portion of the L-shaped restricting section  264 , so as to be engaged in the fourth relay unit  263  through the upper surface  265   a  of the restricting section  265 . For example, the speaker cord L 1  can be electrically connected to the speaker terminal section  191  from the fourth relay unit  263 , or to the metallic terminal  241  through the third relay unit  262 , the second relay unit  261  and the first relay unit  260 . However, a wiring method should not be limited to the above-described manner and it is possible to arrange by wiring the speaker cord L 1  in an inversed order of the above-described manner.  
      As mentioned above, the restricting portion  2641  will downwardly (-z direction) press the speaker cord L 1  led out from the speaker terminal section  191  of the speaker unit  100   a , passing through the fourth relay unit  263  and the upper surface  265   a  of the convex restricting section  265 , and arriving at the connector terminal  40  located near the end of the connector terminal attachment section  25 . In this way, it is possible to restrict the speaker cord L 1  in an upward direction. Moreover, by virtue of the convex restricting section  265  and the L-shaped restricting section  264  separated a predetermined distance from each other, it is possible to restrict the wiring position of the speaker cord L 1  in mutually opposite directions (z direction), thereby making it possible to exactly restrict the wiring position of the speaker cord L 1  in z direction. Further, the second restricting portion  2642  will restrict the wiring position in x direction on the side wall of the connector terminal attachment section  25 .  
      Moreover, since the restricting section  264  is formed into an L-shaped structure protruding on the side wall of the connector terminal attachment section  25  and since such restricting section  264  can restrict the wiring position of the speaker cord L 1  on the inner side of the bent portion of the L-shaped structure, it is possible to restrict the wiring position in both x direction and z direction, as shown in  FIG. 16 . In this way, it is possible to prevent a dislocation of the speaker cord L 1  which can make the speaker cord L 1  to get caught in other elements and thus apply an undesired external force to them, thereby preventing a possible damage to some essential elements of the speaker terminal section or the like.  
      Moreover, by setting the restricting portions  2641  and  2642  of the L-shaped restricting section  264  at appropriate lengths, it is possible to fix a thick speaker cord L 1  or a plurality of speaker cords L 1  at one position so as to restrict the wiring positions of the speaker cords.  
      The present invention is by no means to be limited to the above-described embodiments and it is possible to set a combination containing two or more of the above-described embodiments. Further, although the above-described embodiments are based on a vehicle speaker device, this should not form any limitation to the present invention. Moreover, although the above-described embodiments are based on a round speaker unit, the present invention can also be applied to speaker devices of any other shapes. In addition, although the above description has been given to explain a string-like clamper member  5 , a damper member for use in the present invention can also have any other desired shapes.  
      As described above, the speaker device  1 ( 1   a ) of the present invention has a speaker unit  100  ( 100   a ) , a frame structure  20  having an attachment section for attaching the speaker unit  100  ( 100   a ) to an attachment base. The frame structure  20  has an attachment section  201  ( 21 ) for attaching the speaker unit  100  ( 100   a ) to an attachment base, a fixing section  202  (wiring position restricting means) for fixing the wiring position of the speaker cord L 1  led out from the speaker unit  100  ( 100   a ) on the frame structure  20  by virtue of the damper member  5 . The frame structure and the wiring position restricting means are formed by an identical material such as resin or metal. Therefore, it is possible to restrict the wiring position of the speaker cord using only a simplified structure.  
      Moreover, since the fixing section  202  is protruding outwardly and formed on the side wall of the frame structure  20 , and since the speaker cord L 1  led out from the speaker unit  100  ( 100   a ) is fixed in the fixing section  202  by virtue of the damper member  5 , it is possible to obtain an improved efficiency during an operation of fixing or detaching the speaker cord L 1 .  
      Moreover, the frame structure  20  has a cord fixing section for fixing a part of speaker cord L 1  led out from the speaker unit  100   a  at a predetermined position separated a predetermined distance from the speaker unit  100   a . In more detail, the frame structure  20  has a connector terminal attachment section  25  for fixing a connector terminal  40  formed at one end of the speaker cord L 1  extending from the speaker unit  100 , at a predetermined position separated a predetermined distance from the speaker unit  100   a . The frame structure  20  also has restricting sections  264 ,  265  located between the speaker unit  100  and the connector terminal  40  fixed in the connector terminal attachment section  25  for restricting the wiring position in a direction generally perpendicular to the longitudinal direction of the speaker cord L 1 . In this way, it is possible to exactly restrict the wiring position of the speaker cord L 1  using only a simple structure.  
      While there has been described what are at present considered to be preferred embodiments of the present invention, it will be understood that various modifications may be made thereto, and it is intended that the appended claims cover all such modifications as fall within the true spirit and scope of the invention.