Patent Publication Number: US-10784031-B2

Title: Filter component and bobbin

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 15/861,099, filed on Jan. 3, 2018, and claims priority to Japanese Patent Application No. 2017-032621, filed on Feb. 23, 2017. The entire contents of the above applications are incorporated herein by reference. 
    
    
     BACKGROUND 
     The present invention relates to a filter component assembly kit, a filter component and a method for manufacturing a filter component. 
     In Japanese Patent Publication No. H06(1994)-268465, a filter component is described. The filter component is configured with a core that is in a quadrangular frame shape and a bobbin that is configured by a divided configuration formed of two parts. The filter component has a gear (gear member) for winding a wire around the bobbin by rotating the bobbin. However, because the filter component in Japanese Patent Publication No. H06(1994)-268465 has the gear for winding the wire around the bobbin, an extra region is needed for accommodating the gear separately from a region in which the wire is wound. Therefore, the filter component is increased in size as compared with the performance of the filter component. 
     SUMMARY 
     The present invention attempts to solve the problems explained above. An object of the present invention is to provide a filter component assembly kit, a filter component and a method for manufacturing a filter component, which allows easy winding of a wire around a bobbin without using a gear. 
     A filter component assembly kit according to one aspect of the present invention includes: a bobbin that is configured by connecting a first member to a second member, wherein when the first member is assembled with the second member, a through hole is formed in a center of the bobbin, the through hole extending in a first direction; and a core that is in a quadrangular frame shape, the core being configured with first, second, third, and fourth extension bars, the first and second extension bars extending in parallel in the first direction, the third and fourth extension bars extending in parallel in a second direction, the second direction being perpendicular to the first direction. When the first extension bar is disposed in the through hole of the bobbin, rotation of the core around the first extension bar is prevented. First allowance (freedom of movement) of the first extension bar in the second direction in the through hole is larger than second allowance (freedom of movement) of the first extension bar in a third direction in the through hole, the third direction being perpendicular to the first and second directions. 
     A filter component according to another aspect of the present invention includes: a bobbin that is configured by connecting a first member to a second member, wherein when the first member is assembled with the second member, a through hole is formed in a center of the bobbin, the through hole extending in a first direction; a wire wound around the bobbin; and a core that is in a quadrangular frame shape, the core being configured with first, second, third, and fourth extension bars, the first and second extension bars extending in parallel in the first direction, the third and fourth extension bars extending in parallel in a second direction, which is perpendicular to the first direction. The first extension bar is disposed in the through hole of the bobbin so that rotation of the core around the first extension bar is prevented. First allowance (freedom of movement) of the first extension bar in the second direction in the through hole is larger than second allowance (freedom of movement) of the first extension bar in a third direction in the through hole, the third direction is perpendicular to the first and second directions. 
     With respect to a method for manufacturing a filter component according to another aspect of the present invention, the filter component includes: a bobbin that is configured with a first member to a second member, a through hole being formed in a boundary between the first and second members, the through hole extending in a first direction; a wire wound around the bobbin; and a core that is in a quadrangular frame shape, the core being configured with first, second, third, and fourth extension bars, the first and second extension bars extending in parallel in the first direction, the third and fourth extension bars extending in parallel in a second direction, which is perpendicular to the first direction. First allowance of the first extension bar in the second direction in the through hole is larger than second allowance of the first extension bar in a third direction in the through hole. Third direction is perpendicular to the first and second directions. The method comprises: assembling the core to the bobbin, which is formed by assembling the first and second members, so that the first extension bar is disposed in the through hole; winding a wire around the bobbin by passing the wire in a gap between the bobbin and the second extension bar after the core moves in a first moving direction from the first extension bar toward the second extension bar along the second direction so as to enlarge the gap between the bobbin and the second extension bar; and moving the core in a second moving direction opposite to the first moving direction. 
     According to the present invention, winding a wire around a bobbin without using a gear can be easily performed. As a result, miniaturization of a filter component can be realized. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view that shows a first member, a second member, and a core that configure a filter component according to a first embodiment of the present invention. 
         FIG. 2  is a perspective view that shows a state in which a first member, a second member, and a core that configure a filter component are assembled to each other according to the first embodiment of the present invention. 
         FIG. 3  is a front view that shows a state in which a first member, a second member, and a core that configure a filter component are assembled to each other according to the first embodiment of the present invention. 
         FIG. 4  is a side view that shows a state in which a first member, a second member, and a core that configure a filter component are assembled to each other according to the first embodiment of the present invention. 
         FIGS. 5A-5D  are series process diagrams that explain a method for manufacturing a filter component according to the first embodiment of the present invention. 
         FIG. 6  is a perspective view of a filter component according to the first embodiment of the present invention. 
         FIG. 7  is an exploded view (a front view) that shows a first member and a second member that configure a bobbin of a filter component according to the first embodiment of the present invention. 
         FIG. 8  is a front view of a bobbin of a filter component according to the first embodiment of the present invention. 
         FIG. 9  is a view that shows a positional relationship of each part when a core rotates with respect to a first member according to the first embodiment of the present invention. 
         FIG. 10  is an exploded perspective view that shows a first member, a second member, and a core that configure a filter component according to a second embodiment of the present invention. 
         FIG. 11  is a perspective view that shows a state in which a first member, a second member, and a core that configure a filter component are assembled to each other according to the second embodiment of the present invention. 
         FIG. 12  is a front view that shows a state in which a first member, a second member, and a core that configure the filter component are assembled to each other according to the second embodiment of the present invention. 
         FIG. 13  is a side view that shows a state in which a first member, a second member, and a core that configure the filter component are assembled to each other according to the second embodiment of the present invention. 
         FIG. 14  is a perspective view that shows a state in which a first member, a second member, and a core that configure a filter component are assembled to each other according to a first variation of the first embodiment of the present invention. 
         FIG. 15  is a perspective view that shows a core of a filter component according to a second variation of the first embodiment of the present invention. 
         FIG. 16  is a perspective view that shows a core of a filter component according to a third variation of the first embodiment of the present invention. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Embodiments according to the present invention are explained below with reference to the drawings. In regards to the drawings, redundant explanations with respect to the same configurations are omitted but the same reference numerals are used for labeling. 
     First Embodiment 
     First, a first embodiment according to the present invention will be explained below with reference to  FIGS. 1-9 . 
     A filter component assembly kit  200  according to the first embodiment is used to assemble a filter component  100  ( FIG. 6 ). The filter component  100  is configured with a bobbin  10 , a core  30 , and a wire (a wire rod)  40  ( FIG. 6 ). Specifically, the bobbin  10  has (a boundary or a wall of) a through hole  11  ( FIG. 6 ) after assembling a first member  10   a  and a second member  10   b  to each other. The core  30  is entirely integrally formed in a quadrangular frame shape as a monolithic body. Further, the wire  40  is wound around the bobbin  10 . 
     As shown in  FIG. 1 , the filter component assembly kit  200  is configured with the first member  10   a , the second member  10   b , and the core  30 . The core  30  has a first extension part (bar)  31  and a second extension part (bar)  32  that extend in parallel with each other. 
     The first member  10   a , the second member  10   b , and the core  30  are assembled to each other. The first extension part  31  is disposed so as to pass through the through hole  11 , and at the same time, the second extension part  32  is located at an outside of the through hole  11 . In this assembled state ( FIGS. 2-4 ), a rotation of the core  30  relative to the bobbin  10  is prevented around a longitudinal axis of the first extension part  31 . At the same time, the first extension part  31  can move in a facing direction of the first extension part  31  and the second extension part  32  in the through hole  11 . Further, a first moving length (allowance) in which the first extension part  31  can move in the facing direction in the through hole  11  is larger (longer) than a second moving length (allowance) in which the first extension part  31  can move in an orthogonal direction to both the facing direction and the longitudinal direction of the first extension part  31  in the through hole  11 . 
     In this case, a state in which the rotation of the core  30  relative to the bobbin  10  is prevented around the longitudinal axis of the first extension part  31  means that the core  30  cannot rotate around the bobbin  10  at more than 360 degrees so that a rotatable angle of the core  30  relative to the bobbin  10  is limited (for instance, the angle is limited within 45 degrees). This angle is determined by such as a clearance between an outer surface of the first extension part  31  and an inner surface of a boundary (or an inner wall) of the through hole  11 . Further, the second moving length can also be zero (0). 
     More detail regarding the embodiment will be explained below. Here, in order to make the explanation simple, the explanation will be provided below by defining directions such as up and down. That is, the right and left directions in  FIG. 3  (corresponding to a depth direction in  FIG. 4 ) are defined to be a width direction, and the right and left directions in  FIG. 4  (corresponding to a depth direction in  FIG. 3 ) are defined to be a depth direction. Further, the up and down directions in  FIGS. 3 and 4  are defined to be a vertical direction. However, these directions do not always correspond to the directions in the manufacture and use of the filter component assembly kit  200  and the filter component  100 . 
     In the present embodiment, an assembling direction of the first member  10   a  and the second member  10   b  that configure the bobbin  10  corresponds to a vertical direction. Further, the core  30  is arranged in a position in which a third extension part (bar)  33  and a fourth extension part (bar)  34  explained below extend in a vertical direction. Therefore, the facing direction of the first extension part  31  and the second extension part  32  and the assembling direction (a disassemble direction) of the first member  10   a  and the second member  10   b  are the same, i.e., the vertical directions. 
     As shown in, for instance,  FIG. 7 , the first member  10   a  has a first recess  11   a  that will configure a part of the boundary of the through hole  11 . Further, the second member  10   b  has a second recess  11   b  that will configure the boundary of the through hole  11  together with the first recess  11   a . The first recess  11   a  is formed in a surface, which is opposed to the second member  10   b , of the first member  10   a . Further, the second recess  11   b  is formed in a surface, which is opposed to the first member  10   a , of the second member  10   b.    
     As shown in  FIG. 8 , because the first member  10   a  and the second member  10   b  are assembled to each other, the bobbin  10  is configured with the first member  10   a  and the second member  10   b . Further, at the same time, the boundary of the through hole  11  is formed by combining the first recess  11   a  with the second recess  11   b . The through hole  11  passes through the bobbin  10  in the depth direction in  FIG. 3  (corresponding to the width direction (right and left directions) in  FIG. 4 ). The through hole  11  passes through a central axis of the bobbin  10 . A longitudinal direction of the through hole  11  can be referred to as an axis direction of the bobbin  10 . Further, the longitudinal direction of the first recess  11   a  can be referred to as an axis direction of the first member  10   a . Also, the longitudinal direction of the second recess  11   b  can be referred to as an axis direction of the second member  10   b.    
     In the present embodiment, the first member  10   a  and the second member  10   b  that configure the bobbin  10  are formed in the same shape as each other. 
     As shown in any of  FIGS. 2-4 , for instance, the bobbin  10  has flange-shaped end walls  14 , a flange-shaped center wall  16 , and flange-shaped partition walls  13 . Specifically, the flange-shaped end walls  14  are respectively located at both ends in the axis direction of the bobbin  10 . The flange-shaped center wall  16  is located at the center in the axis direction of the bobbin  10 . Further, the flange-shaped partition walls  13  are located between the end walls  14  and the center wall  16 , respectively. 
     As shown in  FIG. 4 , for instance, parts between the partition walls  13  and the end walls  14  of the bobbin  10  and parts between the partition walls  13  and the center wall  16  of the bobbin  10  configure wound parts  12  around which the wire  40  is wound (See  FIG. 6 ). 
     As shown in  FIG. 1 , each of the first member  10   a  and the second member  10   b  has partition wall component ribs  13   a , a pair of end wall components  14   a , and a center wall component  16   a.    
     In a state in which the bobbin  10  is configured by assembling the first member  10   a  and the second member  10   b  each other, the partition walls  13  are configured with the partition wall component ribs  13   a  of the first member  10   a  and the partition wall component ribs  13   a  of the second member  10   b . The end walls  14  are configured with the end wall components  14   a  of the first member  10   a  and the end wall components  14   a  of the second member  10   b . Further, the center wall  16  is configured with the center wall component  16   a  of the first member  10   a  and the center wall component  16   a  of the second member  10   b.    
     For instance, an engaging pawl (claw)  161 , an engaging projection  162 , a boss  17 , and a fitting hole  18  are formed at the center wall component  16   a . In the state in which the first member  10   a  and the second member  10   b  are assembled to each other, the engaging pawl  161  of the first member  10   a  engages with the engaging projection  162  of the second member  10   b , and at the same time, the engaging pawl  161  of the second member  10   b  engages with the engaging projection  162  of the first member  10   a.    
     Further, in the state in which the first member  10   a  and the second member  10   b  are assembled to each other, the boss  17  of the first member  10   a  is fitted into the fitting hole  18  of the second member  10   b , and at the same time, the boss  17  of the second member  10   b  is fitted into the fitting hole  18  of the first member  10   a.    
     Further, a projection  15  and a rotation prevention member  19  are formed at the end wall component  14   a . A projection  15  is formed at each of the two end wall components  14   a  of the first member  10   a , and these projections  15  upwardly project from upper surfaces of the end wall components  14   a . Further, a projection  15  is formed at each of the two end wall components  14   a  of the second member  10   b , and these projections  15  downwardly project from lower surfaces of the end wall components  14   a . A tip surface of each projection  15  corresponds to a flat surface  15   a . The rotation prevention members  19  are formed at the end surfaces in the axis direction of the first member  10   a  and the second member  10   b . Specifically, the rotation prevention member  19 , for instance, corresponds to an L-shaped rib. That is, the rotation prevention member  19  is configured by a first rib  19   a  that extends vertically and a second rib  19   b  that extends horizontally. 
     As shown in  FIG. 7 , the first member  10   a  has a first recess projection  21  and a third recess (an opposite first recess inner wall)  23 . Specifically, the first recess projection  21  rises (projects) from a surface of the first member  10   a  opposed to the second member  10   b  toward a side of the second member  10   b , and at the same time, the first recess projection  21  configures a part of the first recess  11   a . The third recess (the opposite first recess inner wall)  23  is opposed to the first recess projection  21  while sandwiching the first recess  11   a  therebetween. As shown in  FIG. 7 , a distance between the first recess projection  21  and the opposite first recess inner wall (the third recess)  23  is larger than a width of the first recess  11   a  in the width direction. 
     Further, the second member  10   b  has a second recess projection  22  and a fourth recess  24  (an opposite second recess inner wall). Specifically, the second recess projection  22  rises (projects) from a surface of the second member  10   b  opposed to the first member  10   a  toward a side of the first member  10   a , and at the same time, the second recess projection  22  configures a part of the second recess  11   b . The fourth recess  24  (the opposite second recess inner wall) is opposed to the second recess projection  22  while sandwiching the second recess  11   b  therebetween. As shown in  FIG. 7 , a distance between the second recess projection  22  and the opposite second recess inner wall (the fourth recess)  24  is larger than a width of the second recess  11   b  in the width direction. Further, in the assembled state, the first recess projection  21  is fitted into the fourth recess (the opposite second recess inner wall)  24 , and at the same time, the second recess projection  22  is fitted into the third recess (the opposite first recess inner wall)  23  (refer to  FIG. 8 ). 
     Further, the first member  10   a  has a third recess projection  25  in a position opposed to the first recess projection  21  while sandwiching the first recess  11   a  and the third recess (the opposite first recess inner wall)  23 . That is, the third recess (the opposite first recess inner wall)  23  is formed at a side surface of the third recess projection  25 . In addition, the first member  10   a  has a fifth recess  27  in a position being adjacent to an opposite side of the third recess projection  25  with respect to the first recess projection  21 . 
     Similarly, the second member  10   b  has a fourth recess projection  26  in a position opposed to the second recess projection  22  while sandwiching the second recess  11   b  and the fourth recess (the opposite second recess inner wall)  24 . That is, the fourth recess (the opposite second recess inner wall)  24  is formed at a side surface of the fourth recess projection  26 . In addition, the second member  10   b  has a sixth recess  28  in a position being adjacent to an opposite side of the fourth recess projection  26  with respect to the second recess projection  22 . 
     Further, in the assembled state, the third recess projection  25  is fitted into the sixth recess  28 , and at the same time, the fourth recess projection  26  is fitted into the fifth recess  27  (refer to  FIG. 8 ). 
     The first recess projection  21  and the third recess (the opposite first recess inner wall)  23 , for instance, extend throughout an entire area of the first member  10   a  in the axis direction. Similarly, the second recess projection  22  and the fourth recess (the opposite second recess inner wall)  24 , for instance, extend throughout an entire area of the second member  10   b  in the axis direction. Further, the third recess projection  25  and the fifth recess  27 , for instance, extend throughout the entire area of the first member  10   a  in the axis direction. Similarly, the fourth recess projection  26  and the sixth recess  28 , for instance, extend throughout the entire area of the second member  10   b  in the axis direction. 
     The core  30  is configured with a third extension part (bar)  33  and a fourth extension part (bar)  34  in addition to the first extension part (bar)  31  and the second extension part (bar)  32  explained above. Each of the first extension part  31 , the second extension part  32 , the third extension part  33 , and the fourth extension part  34  is a bar-like (rod-like) member. The first extension part  31  and the second extension part  32 , for instance, extend in parallel to each other. The third extension part  33  and the fourth extension part  34 , for instance, extend in parallel to each other. Further, for instance, the third extension part  33  and the fourth extension part  34  are perpendicular to the first extension part  31  and the second extension part  32 . 
     Each cross sectional shape of the first extension part  31 , the second extension part  32 , the third extension part  33 , and the fourth extension part  34  is, for instance, a quadrilateral shape. Specifically, in the present embodiment, each cross sectional shape of the first extension part  31 , the second extension part  32 , the third extension part  33 , and the fourth extension part  34  is a rectangular shape in which each corner is chamfered. Thus, the core  30  may have the chamfered corners. 
     Further, a cross sectional shape of (the boundary of) the through hole  11  is a quadrilateral shape corresponding to the cross sectional shape of the first extension part  31 . 
     A terminal pin  41  is provided at the second member  10   b . In the present embodiment, for instance, the two wires  40  are wound around the bobbin  10 , separately, and four terminal pins  41  are provided at the second member  10   b.    
     Further, the bobbin  10  of the filter component  100  and the filter component assembly kit  200  according to the present embodiment does not have the configuration corresponding to the gear that is provided with the filter component in Japanese Patent Publication No. H06-268465. Therefore, the miniaturization of the filter component  100  can be realized. 
     Next, a method for manufacturing a filter component according to an embodiment of the present invention will be explained below with reference to  FIGS. 5A-5D and 6 . 
     First, as shown in  FIG. 5A , after laying the core  30  sideways for the first member  10   a , the first extension part  31  of the core  30  is arranged in the first recess  11   a  of the first member  10   a.    
     Next, as shown in  FIGS. 5B and 5C , the core  30  is rotated relative to the first member  10   a  around a longitudinal axis of the first extension part  31  by making part of the first member  10   a  pass through an inner ring of the core  30 . As a result, as shown in FIG.  5 C, the first member  10   a  is located between the first extension part  31  and the second extension part  32  of the core  30 . 
     When the core  30  is in a state shown in  FIG. 5C  by rotating the core  30  at an angle of 90 degrees from its initial state shown in  FIG. 5A , the rotation of the core  30  is prevented because the third extension part  33  and the fourth extension part  34  of the core  30  contact the first rib  19   a  of the rotation prevention member  19  provided on both end surfaces of the first member  10   a.    
     Next, as shown in  FIG. 5D , the second member  10   b  is assembled to the first member  10   a . As a result, the bobbin  10  is configured by the first member  10   a  and the second member  10   b , and at the same time, the boundary of the through hole  11  is configured by the first recess  11   a  of the first member  10   a  and the second recess  11   b  of the second member  10   b . At this time, the first extension part  31  is inserted into the through hole  11 . 
     Further, as shown in  FIG. 5D , the core  30  is relatively raised (pulled-up) with respect to the bobbin (the first extension part  31  moves to a side of the second extension part  32  in the through hole  11 ). As a result, a gap between the bobbin  10  (an upper surface of the first member  10   a ) and the second extension part  32  (an inner edge of the second extension part  32 ) increases. Further, while the gap between the second extension part  32  and the bobbin  10  is expanded (widens), a wire  40  is wound around the bobbin  10  by passing the wire  40  through the gap between the bobbin  10  and the second extension part  32 . That is, the wire  40  is wound around the wound parts  12  of the bobbin  10 . Therefore, because the wire  40  is wound while the gap between the second extension part  32  and the bobbin  10  is expanded (widens), a process, in which the wire  40  is wound around the bobbin  10 , can be easily performed without using a gear. 
     Further, the first member  10   a  and the second member  10   b  can be adhered and fixed to each other by using an adhesive substance. Alternatively, the first member  10   a  and the second member  10   b  are not adhered and fixed to each other by using an adhesive substance (That is, it can also be adopted that the first member  10   a  and the second member  10   b  are only bound by the wound wire  40 ). 
     Next, the core  30  is relatively lowered with respect to the bobbin  10  (the first extension part  31  moves to an opposite side with respect to the second extension part  32  in the through hole  11 ). Thereafter, the first extension part  31  is adhered and fixed to the boundary of the through hole  11  by using an adhesive substance. 
     Further, because the rotation of the core  30  relative to the bobbin  10  is prevented around the longitudinal axis of the first extension part  31 , the core  30  can be stably held by the bobbin  10  during the process in which the wire  40  is wound around the bobbin  10 . At the same time, after the wire  40  is wound around the bobbin  10 , the first extension part  31  can be adhered to the boundary of the through hole  11  in the state in which the core  30  is accurately positioned with respect to the bobbin  10 . 
     Further, for instance, two of the wire  40  are wound around the bobbin  10 . That is, one wire  40  is wound on one side with respect to the center wall  16  as a boundary, and the other wire  40  is wound on the other side with respect to the center wall  16  as the boundary. Then, both ends of each of the wires  40  are respectively and electrically connected to the terminal pins  41 . Further, the terminal pins  41  can be attached to the second member  10   b  in advance before the wires  40  are wound around the bobbin  10 . Alternatively, the terminal pins  41  can be attached to the second member  10   b  after the wires  40  are wound around the bobbin  10 . Further, alternatively, the terminal pins  41  can be attached to the second member  10   b  while the wires  40  are wound around the bobbin  10 . 
     As a result, the filter component  100  shown in  FIG. 6  can be obtained. As explained above, the filter component  100  according to the present embodiment of the present invention corresponds to the filter component  100  that is assembled by using the filter component assembly kit  200  according to the present embodiment of the present invention. Specifically, the filter component  100  is configured with the first member  10   a , the second member  10   b  and the core  30  that are in the assembled state, and the wire(s)  40  that is (are) wound around the bobbin  10 . Further, the first extension part (bar)  31  of the core  30  is fixed to the boundary of the through hole  11 . 
     A method for manufacturing a filter component according to the present embodiment of the present invention is a method for manufacturing the filter component  100  and will be explained below. Specifically, the filter component  100  has the bobbin  10  having the through hole  11  that is formed by assembling the first member  10   a  and the second member  10   b  to each other, the core  30  that is formed in a monolithic (molding) body being a rectangular shaped frame (in a quadrangular frame shape), and the wire(s)  40  that is (are) wound around the bobbin  10 . This method has the following processes. 
     An assembling process is that the first member  10   a , the second member  10   b , and the core  30  are assembled to each other, and the first extension part  31  of the core  30  is located by inserting through the through hole  11 , and at the same time, the second extension part  32  is located at the outside of the through hole  11 . Further, a winding process is that the first extension part  31  moves to a side of the second extension part  32  (in the present embodiment, the upper side) within the through hole  11 , and as a result, a gap between the bobbin  10  (an upper surface of the first member  10   a ) and the second extension part  32  (an inner edge of the second extension part  32 ) increases, and while the gap between the second extension part  32  and the bobbin  10  is expanded (widens), the wire  40  is wound around the bobbin  10  by passing the wire  40  through the gap between the bobbin  10  and the second extension part  32 . Lastly, a moving process is that the first extension part  31  moves to the opposite side (in the present embodiment, the lower side) with respect to the second extension part  32  within the through hole  11 . 
     Further, the assembling process explained above includes the following three processes. A first process is that the first extension part  31  is positioned to the first recess  11   a . A second process is that the first member  10   a  is positioned between the first extension part  31  and the second extension part  32  by making the core  30  rotate with respect to the first member  10   a  around the longitudinal axis of the first extension part  31 . Lastly, a third process is that the first member  10   a  and the second member  10   b  are assembled to each other so that the first extension part  31  is located by inserting through the through hole  11 , and at the same time, the second extension part  32  is located at the outside of the through hole  11 . 
     Further, the method for manufacturing the filter component according to the present embodiment of the present invention has a fixing process in which the first extension part  31  is adhered and fixed to the boundary of the through hole  11  after the first extension part  31  moves to the opposite side with respect to the second extension part  32  in the through hole  11 . 
     As explained above, when the first extension part  31  is arranged in the first recess  11   a , the core  30  can rotate relative to the first member  10   a  around the longitudinal axis of the first extension part  31 . For instance, in the state in which the first extension part  31  always contacts the bottom surface (the top surface of the first recess  11   a  in  FIGS. 5A-5C ) of the first recess  11   a , the core  30  can rotate relative to the first member  10   a  around the longitudinal axis of the first extension part  31 . 
     Further, the first member  10   a  has the rotation prevention member  19  at the outside of the first recess  11   a . Specifically, the rotation prevention member  19  prevents the rotation of the core  30  relative to the first member  10   a  in regards to the rotational angle when the second member  10   b  is assembled to the first member  10   a.    
     Specifically, when the first member  10   a , the second member  10   b , and the core  30  are assembled to each other as shown in  FIG. 5D , the rotation of the core  30  relative to the bobbin  10  is prevented around the longitudinal axis of the first extension part  31 . 
     As shown in  FIG. 8 , in the present embodiment, with respect to a cross section of the first extension part  31  which is orthogonal to the longitudinal direction of the first extension part  31 , a circumscribed circle  36  of the cross section of the first extension part  31  exceeds from a cross section of the boundary of the through hole  11  which is orthogonal to the longitudinal direction of the first extension part  31 . As a result, when the core  30  is made to be rotated relative to the bobbin  10 , the rotation of the core  30  relative to the bobbin  10  is prevented because an outer circumference surface of the first extension part  31  and an inner circumference surface of the boundary of the through hole  11  interfere (abut) to each other. 
     Specifically, when the core  30  is made to be rotated relative to the bobbin  10  around the longitudinal axis of the first extension part  31 , the first extension part  31 , the rotation of the core  30  relative to the bobbin  10  is prevented because the first recess projection  21 , and the second recess projection  22  interfere (abut) to each other. 
     On the other hand, as shown in  FIG. 9 , when the core  30  is made to be rotated relative to the first member  10   a  after the first extension part  31  is arranged in the first recess  11   a  of the first member  10   a  (the processes from  FIG. 5A  to  FIG. 5C ), the core  30  can rotate relative to the first member  10   a  because the corner of the first extension part  31  can invade into the third recess (an opposite first recess inner wall)  23 . That is, before the second member  10   b  is assembled to the first member  10   a , the second recess projection  22  of the second member  10   b  is not placed into the third recess (an opposite first recess inner wall)  23 . Therefore, the rotation of the core  30  relative to the first member  10   a  is allowed. 
     As shown in  FIG. 5D , in the state in which the first member  10   a , the second member  10   b , and the core  30  are assembled to each other, a vertical dimension of the boundary of the through hole  11  is larger than a vertical dimension of the first extension part  31 . As a result, the first extension part  31  can vertically move in the through hole  11 . That is, the core  30  can vertically move relative to the bobbin  10 . 
     Further, a movable length (a first moving length) by which the core  30  can vertically move (in a vertical direction in  FIG. 3 ) relative to the bobbin  10  is longer than a movable length (a second moving length) by which the core  30  can move in an orthogonal direction (explained above) orthogonal to the vertical direction (a right and left (horizontal or crosswise) direction in  FIG. 3 ) relative to the bobbin  10 . That is, in regards to the clearance (allowance (freedom of movement)) between the outer circumference surface of the first extension part  31  and the inner circumference surface of the boundary of the through hole  11 , the clearance (allowance (freedom of movement)) in the vertical direction is larger than the clearance (allowance (freedom of movement)) in the orthogonal direction explained above (the right and left (horizontal or crosswise) direction in  FIG. 3 ). 
     Further, a width dimension of the first extension part  31  in the orthogonal direction (the right and left (horizontal or crosswise) direction in  FIG. 3 ) orthogonal to both the facing direction (the vertical direction in  FIG. 3 ) of the first extension part  31  and the second extension part  32  and the longitudinal direction (the depth direction in  FIG. 3 ) of the first extension part  31  can be larger than the dimension of the boundary of the through hole  11  in the facing direction (the vertical direction in  FIG. 3 ). That is, therefore, the rotation of the core  30  relative to the bobbin  10  can also be prevented. In addition, the width dimension of the boundary of the through hole  11  in the orthogonal direction (the right and left (horizontal or crosswise) direction in  FIG. 3 ) is larger than the (height) dimension of the first extension part  31  in the facing direction (the vertical direction in  FIG. 3 ). As a result, as explained above, after the core  30  is put sideways (lay on its side) with respect to the first member  10   a , the first extension part  31  of the core  30  can be placed in the first recess  11   a  of the first member  10   a.    
     Thus, in the present embodiment, as explained above, the assembling direction of the first member  10   a  and the second member  10   b  corresponds to the facing direction (the vertical direction in  FIG. 3 ). Therefore, in the assembled state, the first member  10   a  is located between the first extension part  31  and the second extension part  32 . 
     Further, it is preferred that a distance D is longer than a distance L as shown in  FIG. 3 . That is, at the center position of the through hole  11  in the orthogonal direction (the right and left (horizontal or crosswise) direction in  FIG. 3 ), a sum of the dimension of the first member  10   a  and the dimension of the boundary of the through hole  11  in the facing direction (the vertical direction in  FIG. 3 ) corresponds to L. In other words, in  FIG. 3 , the distance between the flat surface (upper surface)  15   a  of the projection  15  of the first member  10   a  and the bottom surface of the boundary of the through hole  11  (the bottom surface of the second recess  11   b  of the second member  10   b ) corresponds to L. On the other hand, the distance between the surface of the second extension part  32  facing the first extension part  31  (the lower surface of the second extension part  32  in  FIG. 3 ) and the surface of the first extension part  31  facing the opposite side with respect to the second extension part  32  (the lower surface of the first extension part  31  in  FIG. 3 ) corresponds to D. In other words, in  FIG. 3 , the distance between an inner edge of the second extension part  32  and an outer edge of the first extension part  31  in the facing direction (the vertical direction in  FIG. 3 ) corresponds to D. It is preferred that the following expression is satisfied: L&lt;D. According to the configuration explained above, the core  30  and the bobbin  10  can be suitably assembled. 
     Further, it is preferred that a distance R is longer than the distance L shown in  FIG. 3 . When the bobbin  10  is viewed in the axis direction (such as the depth direction in  FIG. 3 ), the distance R corresponds to a distance between the center position in the orthogonal direction (the right and left (horizontal or crosswise) direction in  FIG. 3 ) on the bottom surface of the boundary of the through hole  11  (the second recess  11   b ) and a farthest position of the bobbin  10  from the center position mentioned above. According to the configuration explained above, the rotation of the core  30  relative to the bobbin  10  around the longitudinal axis of the first extension part  31  is prevented as well. 
     Further, in the assembled state explained above, on a second extension part side counterface surface of the bobbin  10  facing the second extension part  32  (an upper surface of the bobbin  10  in  FIG. 4 ), a projection  15  that projects on a side of the second extension part  32  is formed at least one end of both ends of the upper surface of the bobbin  10  in the longitudinal direction of the first extension part  31  (in the present embodiment, the projections  15  are formed at both ends). Thus, a distance between an intermediate point with respect to both ends of the second extension part side counterface surface of the bobbin  10  and (the inner edge of) the second extension part  32  is longer than a distance between (a tip of) the projection  15  and (the inner edge of) the second extension part  32 . As a result, the winding operation in which the wire(s)  40  is (are) wound around the bobbin  10  by passing the wire  40  through the gap between the second extension part  32  and the bobbin  10  can be more easily performed. 
     In addition, because the bobbin  10  has the projection  15 , the core  30  can be stably held by the bobbin  10  in the state in which the core  30  is positioned relative to the first member  10   a  as shown in  FIG. 5C . In particular, because a tip (upper) surface of the projection  15  is the flat surface  15   a , the core  30  can be more stably held by the bobbin  10 . 
     According to the first embodiment of the present invention explained above, in the assembled state explained above, because the first extension part  31  can move in the facing direction of the first member  10   a  and the second member  10   b  (the vertical direction in  FIG. 3 ) in the through hole  11 , the gap between the second extension part  32  and the bobbin  10  can be expanded (widen) when the wire(s)  40  is (are) wound around the bobbin  10 . Therefore, because the winding of the wire  40  around the bobbin  10  can be easily performed without using a gear, the gear is not required for the filter component  100 . As a result, the miniaturization of the filter component  100  can be realized. 
     In particular, because the first moving length (a relative movable length of the bobbin  10  and the core  30  in the vertical direction in  FIG. 3 ) is longer than the second moving length (a relative movable length of the bobbin  10  and the core  30  in the right and left (horizontal or crosswise) direction in  FIG. 3 ) as explained above, the gap between the second extension part  32  and the bobbin  10  can be sufficiently expanded (widen). 
     Further, in addition, in the assembled state explained above, the rotation of the core  30  relative to the bobbin  10  is prevented around the longitudinal axis of the first extension part  31 . As a result, the core  30  can be stably held by the bobbin  10  during the winding process in which the wire(s)  40  is (are) wound around the bobbin  10 . Further, at the same time, after the wire(s)  40  is (are) wound around the bobbin  10 , the first extension part  31  can be adhered to the boundary of the through hole  11  in the state in which the core  30  is accurately positioned with respect to the bobbin  10 . 
     First Variation of the First Embodiment 
     Next, a first variation of the first embodiment according to the present invention will be explained below with reference to  FIG. 14 . In the first embodiment explained above, the example in which the assembling direction of the first member  10   a  and the second member  10   b  corresponds to the facing direction of the first extension part  31  and the second extension part  32  of the core  30  is explained. In the present variation, the assembling direction of the first member  10   a  and the second member  10   b  and the facing direction of the first extension part  31  and the second extension part  32  of the core  30  cross to each other (for instance, orthogonal to each other). That is, in the present variation, the facing direction explained above corresponds to a vertical direction. Further, the facing direction explained above corresponds to a horizontal direction. 
     In this case, a first moving length in which the first extension part  31  can move horizontally in the through hole  11  is larger than a second moving length in which the first extension part  31  can move vertically in the through hole  11 . In the present variation, although a horizontal dimension of the filter component is larger, a height dimension of the filter component can be smaller as compared with the first embodiment explained above. 
     Second Variation of the First Embodiment 
     Next, a second variation of the first embodiment according to the present invention will be explained below with reference to  FIG. 15 . In the present variation, as shown in  FIG. 15 , width dimensions of the second extension part  32 , the third extension part  33 , and the fourth extension part  34  in the orthogonal direction explained above (the right and left (horizontal or crosswise) direction in  FIG. 3 ) are larger than a width dimension of the first extension part  31  in the orthogonal direction explained above. That is, steps  35  are formed at boundaries between both ends of the first extension part  31  and the third extension part  33  and the fourth extension part  34 . 
     As a result, because a thickness of the second extension part  32  in the facing direction can be suppressed (smaller), a height dimension of the filter component  100  can be smaller as compared with the first embodiment. Further, because thicknesses of the third extension part  33  and the fourth extension part  34  in the axis direction of the bobbin  10  can be suppressed (smaller), a dimension of the filter component  100  in the axis direction of the bobbin  10  can also be smaller as compared with the first embodiment. 
     Third Variation of the First Embodiment 
     Next, a third variation of the first embodiment according to the present invention will be explained below with reference to  FIG. 16 . In the second variation shown in  FIG. 15 , the steps  35  are formed at a deeper (lower) position from the chamfered corners of the third extension part  33  and the fourth extension part  34 . On the other hand, in the present variation, the steps  35  are formed so as to correspond to edges of the chamfered corners of the third extension part  33  and the fourth extension part  34 . In the present variation, a height dimension of the filter component  100  can be smaller, and at the same time, a dimension of the filter component  100  in the axis direction of the bobbin  10  can be smaller as compared with the first embodiment explained above. 
     Second Embodiment 
     Next, a second embodiment according to the present invention will be explained below with reference to  FIGS. 10-13 . 
     In the first embodiment explained above, the assembling direction of the first member  10   a  and the second member  10   b  which configure the bobbin  10  corresponds to the vertical direction. In contrast, in the present embodiment, an assembling direction of a first member  10   a  and a second member  10   b  corresponds to a horizontal direction as shown in  FIGS. 10-12 . 
     However, the core  30  is arranged in a position in which a third extension part  33  and a fourth extension part  34  extend in a vertical direction in the same manner as the first embodiment. Therefore, a facing direction of the first extension part  31  and the second extension part  32  and an assembling direction (a dividing direction) of the first member  10   a  and the second member  10   b  cross to each other (for instance, orthogonal to each other). Therefore, as shown in  FIG. 10 , a first recess  11   a  of the first member  10   a  and a second recess  11   b  of the second member  10   b  are respectively opened toward the horizontal direction. 
     As shown in  FIG. 10 , in the present embodiment, in regards to a surface of the second member  10   b  opposed to the first member  10   a , a first upper projection (plate)  51  and a second upper projection (plate)  52  that respectively project toward a side of the first member  10   a  are formed on an upper portion of the second recess  11   b . Further, in regards to the surface of the second member  10   b  opposed to the first member  10   a , a first lower projection (plate)  53  and a second lower projection (plate)  54  that respectively project toward the side of the first member  10   a  are formed on an lower portion of the second recess  11   b.    
     Similarly, in regards to a surface of the first member  10   a  opposed to the second member  10   b , the first upper projection  51 , the second upper projection  52 , the first lower projection  53 , and the second lower projection  54  are formed as shown in  FIG. 10 . 
     The first upper projection  51  and the second upper projection  52  are located in the position opposed to each other. In a state in which the first member  10   a  and the second member  10   b  are assembled to each other, the first upper projection  51  and the second upper projection  52  are fitted to each other. Similarly, the first lower projection  53  and the second lower projection  54  are located in the position opposed to each other. In the state in which the first member  10   a  and the second member  10   b  are assembled to each other, the first lower projection  53  and the second lower projection  54  are fitted to each other. 
     In the present embodiment, in the assembled state in which the first member  10   a , the second member  10   b , and the core  30  are assembled to each other ( FIGS. 11-13 ), the core  30  can relatively and vertically move relative to the bobbin  10  as well. Further, a first moving length in which the first extension part  31  can relatively and vertically move in the through hole  11  is longer than a second moving length in which the first extension part  31  can relatively and horizontally move in the through hole  11 . 
     Further, as shown in  FIG. 13 , a fitting recess  57 , which is fitted to the third extension part  33 , is formed on one end surface of both end surfaces of the bobbin  10  in the axis direction of the through hole  11 . Further, another fitting recess  57 , which is fitted to the fourth extension part  34 , is formed on the other end surface. 
     However, the present invention is not limited to the above configuration. That is, the fitting recess  57 , which is fitted to the third extension part  33  or the fourth extension part  34 , can also be formed at least on one end surface of both end surfaces of the bobbin  10  in the axis direction of the through hole  11 . 
     In other words, the core  30  has the third extension part  33  and the fourth extension part  34  that extend in parallel to each other. Further, the third extension part  33  and the fourth extension part  34  respectively extend in the crossing direction with respect to the extension directions of the first extension part  31  and the second extension part  32 . Thus, at least one end surface of both end surfaces of the bobbin  10  in the axis direction of the through hole  11  has the fitting recess  57 , which is fitted to one of the third extension part  33  and the fourth extension part  34 . As a result, the dimension of the filter component in the axis direction of the through hole  11  can be made small. 
     Specifically, as shown in  FIG. 10 , a recess  57   a  is formed at the first upper projection  51  of the first member  10   a , and a recess  57   b  is formed at the second upper projection  52  of the second member  10   b . Further, because the recess  57   a  and the recess  57   b  are fitted by assembling the first member  10   a  and the second member  10   b , one of the fitting recesses  57  (shown in  FIG. 13 ) is configured. Thus, part of an inner surface side of the third extension part  33  is fitted to the fitting recess  57 . 
     Further, though an illustration is omitted from the drawings, the recess  57   b  is formed at the second upper projection  52  of the first member  10   a , and the recess  57   a  is formed at the first upper projection  51  of the second member  10   b . Because the recess  57   a  and the recess  57   b  are fitted by assembling the first member  10   a  and the second member  10   b , the other of the fitting recess  57  (shown in  FIG. 13 ) is configured. Thus, part of an inner surface side of the fourth extension part  34  is fitted to the fitting recess  57 . 
     As explained above, in the present embodiment, the assembling direction of the first member  10   a  and the second member  10   b  and the facing direction (of the first and second extension parts  31  and  32 ) explained above cross to each other. Further, the fitting recesses  57  are configured by a first fitting recess component (the recesses  57   a  and  57   b ) being formed at the first member  10   a  and a second fitting recess component (the recesses  57   a  and  57   b ) being formed at the second member  10   b.    
     The present embodiments according to the present invention include the following technical ideas and concepts. 
     A filter component assembly kit comprising: a bobbin including a first member connected to a second member so that a through hole is formed in a center of the bobbin, the through hole extending in a first direction; and a core that is in a quadrangular frame shape, the core being configured with first, second, third, and fourth extension bars, the first and second extension bars extending in parallel in the first direction, the third and fourth extension bars extending in parallel in a second direction, the second direction being perpendicular to the first direction. Further, when the first extension bar is disposed in the through hole of the bobbin, rotation of the core around the first extension bar is prevented. First allowance of the first extension bar in the second direction in the through hole is larger than second allowance of the first extension bar in a third direction in the through hole, the third direction being perpendicular to the first and second directions. 
     In the filter component assembly kit, a cross section of the first extension bar is quadrangular. Further, a cross section of a boundary of the through hole is quadrangular. A width of the first extension bar in the third direction is larger than an inner dimension of the boundary of the through hole in the second direction. An inner dimension of the boundary of the through hole in the third direction is larger than a width of the first extension bar in the second direction. 
     In the filter component assembly kit, a circumscribed circle of a cross section of the first extension bar exceeds from a cross section of the boundary of the through hole, the cross section of the first extension bar extending in the second and third directions, the cross section of the boundary of the through hole extending in the second and third directions. 
     In the filter component assembly kit, the first and second members of the bobbin have first and second recesses, respectively. The first and second recesses configure the boundary of the through hole when the first member is assembled with the second member. Further, when the first extension bar is disposed in the first recess without assembling the first member with the second member, the core is rotatable around the first extension bar with respect to the first member. 
     In the filter component assembly kit, the first member has a rotation prevention member at a position that is offset from the first recess. Further, the rotation prevention member prevents rotation of the core around the first extension bar when the first extension bar is disposed in the through hole. 
     In the filter component assembly kit, the first member has a first recess projection projecting toward the second member and an opposite first recess inner wall. The first recess projection partially configures the first recess. The opposite first recess inner wall is opposed to the first recess projection while sandwiching the first recess therebetween. Further, the second member has a second recess projection projecting toward the first member and an opposite second recess inner wall. The second recess projection partially configures the second recess. The opposite second recess inner wall is opposed to the second recess projection while sandwiching the second recess therebetween. Further, when the first member is assembled with the second member and when the first extension bar is disposed in the through hole, the first and second recess projections engage with the opposite second and first recess inner walls of the second and first recesses, respectively, so as to prevent the core from rotating around the first extension bar by abutting the first extension bar against the first and second recess projections. 
     In the filter component assembly kit, an assemble direction of the first and second members corresponds to the second direction. When the first member is assembled with the second member and when the first extension bar is disposed in the through hole, the first member is located between the first and second extension bars in the second direction. Further, when a combined length of the first member and the through hole in the second direction is defined as D, and a length between an inner edge of the second extension bar and an outer edge of the first extension bar in the second direction is defined as L, an expression of L&lt;D is satisfied. 
     In the filter component assembly kit, the first member has an outer projection at at least one edge of the first member in the first direction. The outer projection outwardly projects from the first member. Further, when the first member is assembled with the second member and when the first extension bar is disposed in the through hole, the first member is located between the first and second extension bars in the second direction. A distance between an inner surface of the second extension bar and a middle outer surface of the first member located between the edges is longer than a distance between the inner surface of the second extension bar and a tip of the outer projection. 
     In the filter component assembly kit, the bobbin has first and second side surfaces that extend in the second and third directions. One of the first and second side surfaces has an engagement recess. Further, one of the third and fourth extension bars engages the engagement recess when the first member is assembled with the second member and when the first extension bar is disposed in the through hole. 
     In the filter component assembly kit, an assemble direction of the first and second members is perpendicular to the second direction. The engagement recess is formed by first and second engagement recesses which are formed in the first and second members, respectively, when the first member is assembled with the second member. 
     A filter component comprising: a bobbin including a first member connected to a second member so that a through hole is formed in a center of the bobbin, the through hole extending in a first direction; a wire wound around the bobbin; and a core that is in a quadrangular frame shape, the core being configured with first, second, third, and fourth extension bars, the first and second extension bars extending in parallel in the first direction, the third and fourth extension bars extending in parallel in a second direction, the second direction being perpendicular to the first direction. Further, the first extension bar is disposed in the through hole of the bobbin so that rotation of the core around the first extension bar is prevented. First allowance of the first extension bar in the second direction in the through hole is larger than second allowance of the first extension bar in a third direction in the through hole, the third direction being perpendicular to the first and second directions. 
     In the filter component, the first extension bar is fixed to a boundary of the through hole. 
     A method for manufacturing a filter component, the filter component including: a bobbin including a first member connected to a second member, a through hole being formed in a boundary between the first and second members, the through hole extending in a first direction; a wire wound around the bobbin; and a core that is in a quadrangular frame shape, the core being configured with first, second, third, and fourth extension bars, the first and second extension bars extending in parallel in the first direction, the third and fourth extension bars extending in parallel in a second direction, the second direction being perpendicular to the first direction. First allowance of the first extension bar in the second direction in the through hole is larger than second allowance of the first extension bar in a third direction in the through hole. The third direction being perpendicular to the first and second directions. The method comprising: assembling the core to the bobbin, which is formed by assembling the first and second members, so that the first extension bar is disposed in the through hole; winding a wire around the bobbin by passing the wire in a gap between the bobbin and the second extension bar after the core moves in a first moving direction from the first extension bar toward the second extension bar along the second direction so as to enlarge the gap between the bobbin and the second extension bar; and moving the core in a second moving direction opposite to the first moving direction. 
     In the method for manufacturing a filter component, the first and second members of the bobbin have first and second recesses, respectively, and the first and second recesses configure the boundary of the through hole. The assembling includes: disposing the first extension in the first recess of the first member; rotating the core around the first extension bar with respect to the first member so as to place the first member between the first and second extension bars; assembling the second member to the first member so as to form the boundary of the through hole, dispose the first extension bar in the through hole, and place the second extension bar in an outside of the bobbin. 
     In the method for manufacturing a filter component, after the core moves in the second moving direction, the first extension bar is fixed in the through hole (fixed to the boundary of the through hole). 
     The filter component assembly kit, the filter component, and the method for manufacturing filter component being thus described, it will be apparent that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be apparent to one of ordinary skill in the art are intended to be included within the scope of the following claims.