Abstract:
A speaker used as a household appliance is provided. The speaker has an ultra-slim structure suitable for an ultra-slim TV and is applied to a woofer speaker representing a superior low-pitched sound characteristic. The speaker has the ultra-slim structure and improves the low-pitched sound characteristic and sound pressure by increasing the amplitude. Outer appearances of a damper and a frame are changed to enlarge a diameter of a voice coil in comparison with an outer diameter of the speaker, the damper has a two-step structure such that a longitudinal amplitude of an upper side of the damper is increased to improve the low-pitched sound characteristic in a state in which a lower side of the damper is put on the frame, and a size of a vibration plate is enlarged to improve the low-pitched sound characteristic and sound pressure. A flat plate is used as the vibration plate.

Description:
PRIORITY 
       [0001]    This application claims the benefit under 35 U.S.C. §119(a) of a Korean patent application filed on Aug. 29, 2011 in the Korean Intellectual Property Office and assigned Serial No. 10-2011-0086318 and on May 3, 2012 in the Korean Intellectual Property Office and assigned Serial No. 10-2012-0047182, the entire disclosure of which is hereby incorporated by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a speaker used for home appliances. More particularly, the present invention relates to a woofer speaker having an ultra-slim structure suitable for an ultra-slim TV and representing a superior low-pitched sound characteristic. 
         [0004]    The present invention is applicable for various speakers having ultra-slim structures and generating both low-pitched sound and high-pitched sound. 
         [0005]    In addition, the present invention relates to a speaker unit having improved functions and a board equipped with the speaker unit, which can improve the low-pitched sound characteristic by providing sufficient sound pressure and can be easily assembled with each other by matching lengths of exposed gold wires with each other. 
         [0006]    2. Description of the Related Art 
         [0007]    A TV, which is the flower of home appliances, has been developed from a Braun tube to a projection TV. Recently, a PDP TV and an LCD TV having the ultra-slim structure have been developed, so the thickness of the TV has become gradually reduced. Thus, the thickness of a speaker installed in the TV is also gradually reduced. 
         [0008]    The audio performance of the TV corresponding to the images displayed in the TV must be improved even if the thickness of the speaker is reduced in terms of the structure. However, if the speaker has the ultra-slim structure, the sound pressure of the speaker may be lowered, so the desired low-pitched sound characteristic and the desired sound pressure may not be achieved and the audio performance corresponding to the images displayed in the TV may not be obtained. 
         [0009]    In this regard, various methods have been proposed to provide speakers having the slim structure or the ultra-slim structure. However, they represent disadvantages in that the desired sound pressure may not be achieved in the woofer system having the low-pitched sound characteristic. 
         [0010]    For instance, a horizontal damper has been proposed to provide the ultra-slim structure. However, such a damper may not amplify the longitudinal amplitude of the sound due to the structural limitation of the speaker having the ultra-slim structure. In addition, since the up-down vibration is accelerated, the horizontal damper is not suitable for the low-pitched sound characteristic. 
         [0011]    In addition, since the speaker is manufactured with the ultra-slim structure, when gold wires connected to a voice coil are connected to a contact terminal by exposing the gold wires to the outside, if lengths of the gold wires are different from each other, the vibration amplitude at one side may be different from the vibration amplitude at the other side due to the thin thickness of a bobbin, which is vibrated up and down, so the gold wires must be connected to the contact terminal by matching the lengths of the gold wires with each other. 
         [0012]    However, since the speaker unit has the ultra-slim structure, the assembling space may be narrow and the lengths of the gold wires are short, so the soldering work is very inconvenient and difficult. 
         [0013]    Further, when the speaker unit having the ultra-slim structure is assembled with the board, a cover is mounted in a state that a coupling hole formed at an edge of a frame matches with a coupling hole formed in the board, and a screw is fastened into the coupling holes. At this time, the screw is screw-coupled into the board while passing through the coupling hole of the ultra-slim speaker located inside the cover, so the assembling work is difficult and inconvenient due to the coupling holes of the speaker unit and the board, which may be hidden during the assembling work. 
         [0014]    In addition, when the board is coupled with the speaker unit having the ultra-slim structure, wires of the speaker unit, which are left in the free-state, are connected to external devices. Thus, as the speaker unit is vibrated, the free-state wires may be shaken while making contact with the board due to the vibration, so loud noise may be generated. 
         [0015]    The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present invention. 
       SUMMARY OF THE INVENTION 
       [0016]    Aspects of the present invention are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages describes below. Accordingly, an aspect of the present invention is to provide a speaker unit having the ultra-slim structure, capable of improving the low-pitched sound characteristic and the amplitude of the sound, thereby improving sound pressure. 
         [0017]    Another aspect of the present invention is to provide a speaker unit, which can improve the low-pitched sound characteristic by providing sufficient sound pressure, can facilitate the assembling work by matching lengths of exposed gold wires with each other, and can be readily assembled with a board. 
         [0018]    In order to accomplish the above objects, outer appearances of a damper and a frame are changed to enlarge a diameter of a voice coil in comparison with an outer diameter of a speaker, the damper is configured in a two-step structure such that a longitudinal amplitude of an upper side of the damper is increased to improve the low-pitched sound characteristic in a state in which a lower side of the damper is put on the frame, and a size of a vibration plate is enlarged to improve the low-pitched sound characteristic and sound pressure. 
         [0019]    In addition, a flat plate is used as the vibration plate to allow the speaker unit to be fabricated in the ultra-slim structure. 
         [0020]    In order to improve the assembling structure, according to the present invention, a pair of locking rims protrude outward to form concave valleys, which are adjacent to each other and recessed inward, in such a manner that gold wires fitted in the concave valleys can be connected to a contact terminal, thereby allowing the exposed gold wires to have the same length. 
         [0021]    Further, according to the present invention, a plurality of coupling members are provided at edges of the frame, which are expanded outward, and coupling protrusions having coupling holes are provided in the board. The coupling protrusions are inserted into coupling holes of the coupling members so that the board can be integrally assembled with the frame. 
         [0022]    In addition, a plurality of fixing plates, which are vertically erected, are integrally formed with the board through the injection molding process. The wires connected to the contact terminal are fitted in fixing holes of the fixing plates and thermally fused, so that noise may not be generated. 
         [0023]    Therefore, according to the present invention, the speaker unit having the ultra-slim structure and representing the superior low-pitched sound characteristic can be provided by changing the structure of the damper, so the speaker unit may be suitable for the slim type TV. 
         [0024]    In addition, the speaker unit having the ultra-slim structure can be provided by changing the mounting structure of the damper and the shape of the vibration plate, and the assembling work for the speaker unit may be facilitated. 
         [0025]    Further, according to the present invention, the damper has the two-step structure, so the speaker unit suitable for expensive slim TVs can be provided and the speaker unit may represent the superior low-pitched sound characteristic and the sufficient sound pressure. In particular, since the gold wires are connected by using the locking rims formed with concave valleys, the speaker unit having the ultra-slim structure can be assembled by readily adjusting the lengths of the gold wires. 
         [0026]    In addition, the board equipped with the speaker unit may have advantages in terms of economy and durability due to the improved assembling structure. 
         [0027]    Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0028]      FIG. 1  is an exploded perspective view showing the assembling structure of the present invention; 
           [0029]      FIG. 2  is a perspective view showing an outer appearance of the speaker unit according to an exemplary embodiment of the present invention; 
           [0030]      FIG. 3  is a sectional perspective view of the speaker unit according to an exemplary embodiment of the present invention; 
           [0031]      FIG. 4  is a sectional view showing a damper mounted in a frame according to an exemplary embodiment of the present invention; 
           [0032]      FIG. 5  is a perspective view of a damper according to an exemplary embodiment of the present invention; 
           [0033]      FIG. 6  is an enlarge perspective view showing a main component of a damper according to an exemplary embodiment of the present invention; 
           [0034]      FIG. 7  is a perspective view showing a vibration plate according to an exemplary embodiment of the present invention; 
           [0035]      FIG. 8  is a view showing a vibration plate and a damper which resist against twist according to an exemplary embodiment of the present invention; 
           [0036]      FIG. 9  is an exploded perspective view showing an ultra-slim speaker unit having a damper according to another exemplary embodiment of the present invention; 
           [0037]      FIG. 10  is a sectional view taken when a speaker unit, for example the speaker unit shown  FIG. 9 , is assembled according to an exemplary embodiment of the present invention; 
           [0038]      FIG. 11  is a perspective view showing a damper according to another exemplary embodiment of the present invention; 
           [0039]      FIG. 12  is a view showing a usage state of a damper, for example the damper shown in  FIG. 11 , according to an exemplary embodiment of the present invention; 
           [0040]      FIG. 13  is a perspective view showing the connection procedure of gold wires to a power terminal by using a damper according to an exemplary embodiment of the present invention; 
           [0041]      FIG. 14  is a sectional perspective view showing a coil wire connected to a terminal according to an exemplary embodiment of the present invention; 
           [0042]      FIG. 15  is a perspective view showing a board equipped with a speaker unit according to an exemplary embodiment of the present invention; 
           [0043]      FIG. 16  is an exploded perspective view showing the assembling process a speaker unit to a board according to an exemplary embodiment of the present invention; 
           [0044]      FIG. 17  is a perspective view showing the assembling procedure of a frame of a speaker unit to a board according to an exemplary embodiment of the present invention; and 
           [0045]      FIG. 18  is a perspective view showing a fixed state of a wire according to an exemplary embodiment of the present invention. 
       
    
    
       [0046]    Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. 
       DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0047]    The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
         [0048]    The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention is provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. 
         [0049]    It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
         [0050]      FIGS. 1 to 8  show the structure of a speaker unit according to one exemplary embodiment of the present invention. As shown in the drawings, a yoke  110  provided therein with a permanent magnet  120  is mounted on a frame  10 . The frame  10  is provided with an inner wall  13  such that an outer wall  110   a  of the yoke  110  having the permanent magnet  120  fixedly adheres to the inner wall  13  of the frame  10 . The inner wall  13  protrudes toward an inside of the frame  10  (that is, a space where a damper is provided) to achieve the ultra-slim structure, and a bottom surface  11  having a space  12  is formed in the frame  10  to allow the damper  20  to be placed on an extension line of a lower end of the inner wall  13  protruding toward the inside of the frame  10 . An outer wall  14  is formed outward of the inner wall  13  and the bottom surface  11  having the space  12 . The outer wall  14  is formed with openings  16  defined by a plurality of support walls  15 . 
         [0051]    In addition, one of the support walls  15  constituting the outer wall  14  is formed with a terminal hole  15   a  for fixedly connecting a coil wire  131  of a voice coil  130 , which is drawn through an opening  22   a  of the damper  20 , to a power terminal  160  provided outside the support wall  15 . Further, a locking protrusion  15   b  is provided inside the support wall  15  to fix the damper  20  placed on the bottom surface  11  having the space  12 . The locking protrusion  15   b  may be slightly lifted upward to prevent the damper  20  from being shaken when the damper  20  is placed on the bottom surface  11 . The structure and the position of the locking protrusion  15   b  may vary depending on applications. In order to prevent the damper  20  from being shaken, the locking protrusion  15   b  may be bonded to the bottom surface  11  or the support wall  15  constituting the outer wall  14  by an adhesive. 
         [0052]    In addition, a rim edge  17  in the form of a stepped portion is provided at an outer peripheral portion of the frame  10  such that an edge  141  of the vibration plate  140  is fixedly bonded to the rim edge  17 . 
         [0053]    Further, the damper  20  includes an outer rim  21  and an inner rim  22 . The outer rim  21  of the damper  20  is fixedly placed on the bottom surface  11  of the frame  10  having the space  12  or fixed to the support wall  15  constituting the outer wall  14 . The inner rim  22  of the damper  20  is fixedly bonded to the vibration plate  140  to which the voice coil  130  is bonded. 
         [0054]    The outer rim  21  is placed on the bottom surface  11  having the space  12  and fixedly bonded thereto, or fixedly locked with the locking protrusion  15   b  of the support wall  15  while being slightly lifted upward from the bottom surface  11  to prevent the damper  20  from being shaken caused by the vibration. In order to allow the inner rim  22  to be lifted upward from the bottom surface  11  by a predetermined distance corresponding to the maximum amplitude of the up-down vibration, the inner rim  22  is located inside and above the outer rim  21  while being spaced apart from the outer rim  21  by a predetermined distance as possible. In this state, crank-shaped elastic bars  23  are connected to an upper end of the outer rim  21  and a lower end of the inner rim  22 , so the inner rim  22  can be vibrated up and down with the maximum amplitude. 
         [0055]    In addition, according to the present invention, the damper  20  is fabricated through the injection molding process by using various plastics to achieve the low weight and to prevent the shape deformation. However, the injection molding may not intend to limit the scope of the present invention, and the damper  20  may be fabricated by using a metal or various materials other than the plastic. 
         [0056]    In order to allow the damper  20  to have a minimum weight as well as predetermined strength and durability, the outer rim  21  and the inner rim  22  are fabricated by using a plate having a predetermined width, and the outer rim  21  and the inner rim  22  are vertically erected for vertical reinforcement. The elastic bar  23  is horizontally laid perpendicularly to the outer rim  21  and the inner rim  22  to maximize the elasticity. Thus, when the elastic bar  23  is vibrated up and down, the upright strength of the outer rim  21  and the inner rim  22  can be maintained and the elasticity of the elastic bar  23  is improved. 
         [0057]    In addition, the elastic bar  23 , which is horizontally laid, is located between the outer rim  21  and the inner rim  22  while being bent along the outer peripheral portions of the outer rim  21  and the inner rim  22 , so the inner rim  22  can precisely maintain the longitudinal amplitude when the inner rim  22  is vibrated up and down. In order to allow the elastic bar  23  to be located along the outer peripheral portions of the outer rim  21  and the inner rim  22 , reinforcement members  24 , which are vertically extended, are provided at connection parts of the elastic bar  23  with respect to the outer rim  21  and the inner rim  22  and the elastic bars  23  extend from the reinforcement members  24  in a curved shape, so that the amplitude can be precisely maintained upon the up-down vibration of the inner rim  22 . 
         [0058]    Further, according to the present invention, the reinforcement member  24  is formed with a weight-reduction part to maintain the reinforcement member  24  at the light weight upon the up-down vibration of the inner rim  22 . In addition, the reinforcement member  24  includes a reinforcement rib  24   a  and a recess  24   b  to prevent the twist when the elastic bar  23 , which is horizontally curved, is accurately operated. The elastic bar  23 , which is horizontally curved, is connected to a front end of the recess  24   b.    
         [0059]    In addition, the coil wire  131  from the voice coil  130  fixedly bonded to the vibration plate  140  is drawn through the opening  22   a  of the inner rim  22  of the damper fixed to the vibration plate  140  and is connected to the power terminal  160  connected to the outer portion of the support wall  15  through the terminal hole  15   a  formed in one of the support walls  15  constituting the outer wall  14  of the frame  10 . 
         [0060]    Referring to  FIG. 7 , inclined protrusions  142  are provided at one side of the edge  141  of the vibration plate  140 . In this case, the elastic bar  23  of the damper  20  extends in one direction while varying the height thereof from the inner rim  22  to the outer rim  21 , so it is possible to resist against the twist upon the up-down vibration. 
         [0061]    In addition, according to the present invention, the vibration plate  140  is fabricated by using a flat plate. In this case, the speaker unit may have the ultra-slim structure. Since the vibration plate  140  is directly bonded to the inner rim  22  of the damper  20 , it is possible to use the vibration plate  140  having a larger diameter, so the rate of the longitudinal amplitude can be reduced. In addition, since the vibration plate  140  is connected to the damper  20  including the outer rim  21  and the inner rim  22  having the height difference, the vibration plate  140  may not make contact with the yoke  110  upon the up-down vibration. In addition, since the inner rim  22  of the damper  20  is vibrated up and down within the outer rim  21 , the amplitude of the vibration of the vibration plate  140  may be increased, so that the low-pitched sound characteristic can be improved. Further, since the bobbin  130   a  of the voice coil  130  may have the larger diameter, the length of the coil  130   b  wound around the bobbin  130   a  may be increased, so that the sound pressure can be improved. 
         [0062]    Further, the damper  20  is fabricated by using a conductive material having a light weight, so the coil of the voice coil can be directly connected to the damper in a simple way, so that the assembling process for manufacturing the speaker unit can be simplified. 
         [0063]    However, the variation of the material may not lead to the variation of the object of the present invention. The variation of the material and the structure is possible within the scope of the present invention. 
         [0064]      FIGS. 9 to 14  show a speaker unit having the ultra-slim structure according to another embodiment of the present invention. As shown in the drawings, the yoke  110  provided therein with the permanent magnet  120  is integrally formed with the frame  10  through the insert injection molding process, so the assembling work can be improved. To this end, a projection rim  111  is provided at the lower end of the yoke  110  and the frame  10  is injection molded while surrounding the projection rim  111 , so the bonding process can be omitted and the yoke  110  can be securely fixed to the frame  10 . 
         [0065]    In addition, a terminal  150  is provided on the vibration plate  140  and the coil wire  131  of the coil  130   b  wound around the bobbin  130   a  is connected to the terminal  150 . In addition, gold wires  162  connected to the power terminal  160  are formed in the terminal  150 . 
         [0066]    To this end, the coil wire  131  is directly connected to one terminal  150   a  of the terminal  150  formed in the vibration plate  140  in such a manner that the coil  130   b  wound around the bobbin  130   a  can be prevented from being released by the coil wire  131  and the assembling work can be facilitated. In addition, the other terminal  150   b  is connected to the one terminal  150   a  through a flexible board  150   c  while forming an electrode, so the gold wires  162  can be connected to the other terminal  150   b  such that the gold wire  162  can be connected to the power terminal  160  connected to the external power source. 
         [0067]    Thus, the coil wire  131  can be easily connected to the gold wires  162 , which are used for connection with the external power source, and the power terminal  160  and the gold wires  162  can be easily welded with each other during the assembling work. 
         [0068]    In addition, a rim mount  17  is formed at an upper end of the outer wall  14  of the frame  10  and the edge  141  of the vibration plate  140  is placed on the rim mount  17 . In addition, coupling members  19  having coupling holes  19   a  are provided at edges of the frame  10 , respectively. Coupling protrusions  203  of the board  200  are inserted into the coupling holes  19   a , so the board  200  can be simply integrated with the frame  10 . 
         [0069]    Further, a plurality of locking rims  25  protrude in adjacent to each other from the outer rim  21  of the damper  20  while forming a concave valley  26  therein. When the gold wires  162  connected to the vibration plate  140  are assembled with the power terminal, the gold wire  162  exposed out of the damper  20  is fitted in the concave valley  26  and the other end of the gold wire  162  is connected to the power terminal  160 . Thus, the exposed gold wires  162  can be connected to the power terminal in the same length. 
         [0070]    The number of concave valleys  26  formed in the outer rim  21  may correspond to the number of gold wires  162 . A locking plate  27  is provided between the locking rim  25  and another locking rim  25   a  while interposing the support walls  15  constituting the outer wall  14  therebetween. The locking plate  27  is exposed to the outside through the opening  16  and adheres to the support wall  15 . In this state, each locking rim  25  is exposed out of the opening at the same distance about the support wall  15 . 
         [0071]    At this time, an upper end of the opening  16  is partially cut and an upper end of the support wall  15  is located in the cutting part of the opening  16 . A polygonal fixing protrusion  18  protrudes outward from the upper end of the support wall  15  and a groove  161  is formed in the power terminal  160  corresponding to the fixing protrusion  18 . Thus, the power terminal  160  is fitted with the fixing protrusion  18  so that the assembling work can be simplified. 
         [0072]      FIG. 13  shows the procedure for connecting the gold wires  162  to the power terminal  160 . First, the damper  20  is fixed to the bottoms surface  11  of the frame  10  and the voice coil  130  is assembled with the vibration plate  140 . Then, the gold wires  162  are exposed out of the frame  10  through the openings formed in the support walls  15  constituting the outer wall  14 . 
         [0073]    At this time, if the power terminal  160  is assembled on the support walls  15  by the coupling between the fixing protrusion  18  and the groove  161 , since the opening is partially cut according to the size of the power terminal, the locking plate  27 , which is exposed out of the opening  16  together with the locking rim  25  of the damper  20 , fixedly adheres to the support wall  15 , so that the locking rims  25  exposed out of the openings  16  may be located at left and right about the power terminal. 
         [0074]    In addition, in a state that the exposed gold wires  162  are fixedly fitted in the concave valleys  26  of the locking rims  25 , other ends of the gold wires  162  are fixedly soldered to the power terminal  160 , and the locking rims  25  are cut, so that the gold wires  162  exposed out of the damper  20  may be connected to the power terminal  160  in the same length. 
         [0075]    Therefore, according to the present invention, when the speaker having the ultra-slim structure is fabricated, the problem that the vibration amplitude at one side of the gold wire is different from the vibration amplitude at the other side of the gold wire caused by the difference in length of the gold wires due to the thin thickness of the bobbin and the structural limitation can be solved and the assembling work can be performed without inconvenience. 
         [0076]      FIGS. 15 to 18  show the board assembled with the speaker unit having the ultra-slim structure. The board is formed at the center thereof with an opening  201  and provided at the outer peripheral portion thereof with a fixing rim  202  surrounding the outer peripheral portion of the speaker unit and coupling protrusions  203  having coupling holes  203   a . Thus, when the speaker is assembled with the board  200 , the coupling protrusions  203  of the board  200  are inserted into the coupling members  19  of the frame  10 . In this state, assembling screws  211  are screw-coupled into the coupling holes  203   a  of the board  200  by passing through a cover  210 , so that the speaker unit having the ultra-slim structure can be easily assembled with the board at a time. 
         [0077]    In addition, a ventilation port  204  is formed at one side of the board  200  and a ventilation path  205  having a curved structure is formed while surrounding the ventilation port  204 . Thus, air can be sufficiently supplied, so that the output of the sound can be increased by expanding the sound. 
         [0078]    Further, as shown in  FIG. 18 , a plurality of fixing plates  206  are vertically erected on the bottom of the board  200 . The fixing plates  206  are integrally formed with the board  200  through the injection molding process. The fixing plates  206  have fixing grooves  207  and electric wires  208  connected to the power terminal  160  are fixedly inserted into the fixing grooves  207 . In this state, the electric wires  208  are fused to the fixing grooves  207  by applying heat, so the electric wires  208  leaving in the free-state (the state to be moved freely) may be tightly pulled, thereby preventing the noise caused by the movement of the electric wires  208  due to the vibration. 
         [0079]    In addition, fixing grooves are formed in the reinforcement ribs provided inside the board  200  of the present invention to prevent the board  200  from being twisted, and the electric wires  208  are fitted in the fixing grooves and thermally fused to the fixing groove, thereby obtaining the same effect as described above. 
         [0080]    Further, a recess  230  is formed at one side of the board  200  and the electric wires  208  are fitted in a fixing member  240  and exposed to the outside. That is, a stepped electric member  231  is provided at one side of the recess  230 , and a guide  232  and an expose hole  233  are formed at the other side of the recess  230 . Thus, in a state that the electric wires  208  are fitted in the fixing member  240  through the expose hole  233 , if the fixing member  240  is introduced into the recess  230 , the elastic member is widened and a guide plate  241  of the fixing member  240  and the guide  232  are engaged with each other so that the guide plate  241  and the guide  232  can be fixedly adhered with each other. At this time, the electric wires  208  are exposed to the outside through a groove formed in the fixing member  240 . 
         [0081]    Therefore, the present invention can improve the low-pitched sound characteristic by providing sufficient sound pressure and the speaker can be easily assembled with the board by matching lengths of exposed gold wires with each other. 
         [0082]    While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.