Abstract:
A configuration of a push switch minimizes the extent to which the switch protrudes from a wiring board, and thereby allows for a device including the switch to have smaller dimensions. Minimizing the height by which the switch protrudes above the wiring board also minimizes the moment caused by the pressing the switch which is transferred to terminals soldered to the wiring board, and thus improves the mechanical strength of the attachment to the wiring board. The configuration includes, in part, a case having a terminal protruding therefrom, wherein a lower surface position of the terminal where soldering is performed is located above a bottom surface of the case.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a push switch, which is used for input operating sections or the like of a variety of electronic devices and is functioned by pushing in the operating section from a direction parallel to the surface of a mounted wiring board, and also relates to an electronic device loaded with the push switch. 
     BACKGROUND OF THE INVENTION 
     In recent years, a variety of electronic devices are increasingly downsized, slimmed down and multifunctional, and a push switch for use in input operating sections of those electronic devices also has an increased mounting density. A push switch of a so-called horizontal push type, which is mounted at an edge section of a wiring board of an electronic device and operated by pushing in an operating section from a direction parallel to the surface of the wiring board, has also been increasingly adopted. 
     Such a conventional push switch is described with reference to  FIGS. 12 and 13 .  FIG. 12  is an exploded perspective view of a conventional push switch.  FIG. 13  is a side sectional view of a mounted state of the conventional push switch. 
     In  FIGS. 12 and 13 , numeral  1  denotes a case made of an insulating resin in a substantially rectangular shape seen from above, having open-top concave section  1 A, and on the inner bottom surface of that concave section  1 A, central fixed contact  2  and outer fixed contact  3  are electrically independently provided by insert molding. Terminals  2 A,  3 A respectively extended from central fixed contact  2  and outer fixed contact  3  are also fixed by insert molding, and each led outward from case  1 . Further, in a position of a front bottom section of case  1 , downward projection  1 B projecting downward is provided. 
     Numeral  4  denotes an open-bottom circular dome-shaped movable contact made of an elastic metal sheet, which is housed inside concave section  1 A of case  1 , the peripheral lower end of which is placed on outer fixed contact  3 , and the lower surface of the dome-shaped central section of which is opposed to central fixed contact  2  with a space formed therebetween. Numeral  5  denotes a protective sheet made of an insulating film and provided with an adhesive, not shown, on its lower surface, and the protective sheet is made to adhere to the upper surface position of the periphery of concave section  1 A of case  1  so as to cover concave section  1 A. 
     Numeral  6  denotes an operating body made of an insulating resin, provided with operating section  6 A located in a projecting manner on the front surface side of case  1 , the operating body having behind operating section  6 A bar-shaped elastic projection  6 B with its end formed as pushing section  6 C in substantially spherical shape, and being provided with sliding section  6 D in frame shape so as to surround the periphery of that elastic projection  6 B. This sliding section  6 D is longitudinally movably placed on protective sheet  5 . 
     Numeral  7  denotes a cover which is made of a metal plate and controls upward movement of operating body  6 , and the cover is fixed to case  1  while pushing section  6 C at the end of elastic projection  6 B of operating body  6  is in a contact state with the front surface of inclined surface  7 A provided in the central portion. 
     Next described is an operation of the conventional push switch configured as above. First, when operating section  6 A of operating body  6  is pushed in backward, sliding section  6 D moves backward on protective sheet  5 . Pushing section  6 C at the end of elastic projection  6 B, which is in contact with inclined surface  7 A of cover  7 , moves as guided diagonally downward along inclined surface  7 A. The diagonally downward movement of pushing section  6 C applies push-down force to movable contact  4  through protective sheet  5 . When the push-down force exceeds elastic reverse force of movable contact  4 , the dome-shaped portion of movable contact  4  is transformed into a bottom convex shape accompanied by a sense of click, and its lower surface comes into contact with central fixed contact  2  to which the lower surface is opposed downward, so that the switch is turned on. 
     When the force having pushed in operating section  6 A is released, by self-restoring force of movable contact  4 , movable contact  4  is restored to the original dome shape rounded upward, accompanied by a sense of click, and the above-mentioned lower surface of the central section is separated from central fixed contact  2 , so that the switch is turned off. At that time, elastic projection  6 B is pushed back upward by the self-restoring force of movable contact  4 , and pushing section  6 C at the end of elastic projection  6 B moves as guided diagonally upward along inclined surface  7 A of cover  7 . With the movement of pushing section  6 C, sliding section  6 D moves forward on protective sheet  5 , and operating body  6  returns to the original state. 
     As shown in  FIG. 13 , in the push switch, terminals  2 A,  3 A are soldered and mounted with downward projection  1 B of case  1  in the state of being inserted in rectangular cut-out section  12  provided at the edge section of wiring board  11 . 
     In this mounting state, when operating section  6 A of operating body  6  is pushed in parallel to the surface of wiring board  11  for operation, downward projection  1 B provided in case  1  prevents separation of the soldered portions of terminals  2 A,  3 A against an excessive load applied to operating body  6 , by its rear surface coming to wiring board  11 . 
     It is to be noted that as related art relevant to the invention of this application, for example, Unexamined Japanese Patent Publication Nos. 2007-329022 (Patent Document 1), 2001-210176 (Patent Document 2), and the like are known. 
     In response to slimming down of a variety of electronic devices, the conventional push switch has also been required to be further slimmed down while holding its mechanical strength, notably separation strength of the soldered portion. 
     However, the conventional push switch has a structural limit on the lowering of its height from the surface of wiring board  11 . Further, although the form of Patent Document 2 is also known, this has a projection toward the lower surface of a wiring board, thus having the problem of being unable to satisfy the need for slimming down. 
     SUMMARY OF THE INVENTION 
     A push switch of the present invention includes a case, an open-bottom dome-shaped movable contact made of an elastic metal sheet, a protective sheet, an operating body, and a cover. The case has on a plane surface an open-top concave section housing the movable contact, and includes a plurality of electrically independent fixed contacts on an inner bottom surface of the concave section, and surface-mounted type terminals connected to the plurality of fixed contacts and led outward. The operating body includes an operating section projecting ahead of the case, and is longitudinally movably placed on the protective sheet. The cover is fixed to the case from above the operating body. The terminal is led outward from a side section of the case, and a lower surface position of the terminal where soldering is performed is located above a bottom surface of the case. 
     Thereby, the case portion located below the soldered position of the terminal is inserted and mounted into the cut-out section provided at the edge section of the wiring board of the device. It is possible to provide a push switch that can be mounted while a height position where an operation to the operating body is performed is in a state close to the wiring board surface side, to suppress a moment of the pressing operation applied to the soldered section after the mounting so as to have an advantage in mechanical strength and suppress the height from the wiring board surface in the mounted state. 
     In another push switch of the present invention, the inner bottom surface of the concave section of the case is located below the lower surface position of the terminal where soldering is performed. Since the internal structure of the push switch can be configured to be lowered in position, the height from the wiring board can further be suppressed. 
     In another push switch of the present invention, a rest section is provided which projects outward more in an upper portion of each of at least right and left side sections of the case than in a lower portion thereof, with the lower surface position of the led-out terminal taken as a border. Providing the rest section to be placed on the wiring board in contact therewith allows stable placement of the push switch in the cut-out section, so as to improve mounting operationality. 
     In another push switch of the present invention, a corner projecting section is provided in a projecting manner in L shape at each corner section of the plane surface of the case, a step section projecting from the plane surface at a position higher than an upper surface of the protective sheet is formed in a base of the corner projecting section, and the sliding section of the operating body is placed on the upper surface of the step section. This allows the operating body to move smoothly free of friction with the protective sheet at the time of longitudinally moving on the step section, so as to give a favorable operational feel. 
     In another push switch of the present invention, two each of the terminals are provided in symmetrical positions of the case, and a width of the terminal located on the front side is set larger than a width of a rear terminal located on a rear side. It is possible to increase mechanical strength after solder-mounting against a moment of the pressing operation that is intensely applied to the front-side terminal. 
     In another push switch of the present invention, the terminal is provided with a cut-out section. Since this cut-out section acts as a solder pool at the time of soldering, it is possible to increase the mechanical strength after solder-mounting. 
     In another push switch of the present invention, two each of the terminals are provided in symmetrical positions of the case, and the terminal located on the front side is bent downward on its end side. The bent end side is inserted into a through hole provided in the wiring board to be solder-mounted, whereby it is possible to increase mechanical strength after solder-mounting against a moment of the pressing operation that is intensely applied to the front-side terminal. 
     An electronic device of the present invention has a wiring board provided with a cut-out section into which the push switch is inserted, and a space from a back-side end surface of the cut-out section to a center of a longitudinal width of the land for a terminal is set shorter than a space from a rear-end section of the push switch in contact with the back-side end surface of the cut-out section to a center of a width of the terminal. When molten solder is solidified, condensing force acts to achieve balance such that each terminal is located at the center of the land width, whereby the push switch is energized toward the back side of the cut-out section and solder-fixed to the back-side end surface in a close contact state therewith. This can result in stabilization of the position on the wiring board as well as improvement in mechanical strength due to direct reception of an excessive load on the end surface of the wiring board at the time of application of the load to the operating section. 
     As thus described, according to the present invention, it is possible to provide a push switch with its height from a wiring board suppressed in a mounted state without causing deterioration in mechanical strength, and also provide an electronic device loaded with the push switch. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an external view of a push switch according to an embodiment of the present invention; 
         FIG. 2  is an exploded perspective view of the push switch; 
         FIG. 3  is a side sectional view of the push switch; 
         FIG. 4  is an external view explaining a state where a wiring board of an electronic device is loaded with the push switch; 
         FIG. 5  is a plan view of a state where the push switch is inserted in a cut-out section of the wiring board of an electronic device; 
         FIG. 6  is a side sectional view of a mounted state; 
         FIG. 7  is an external view of a push switch with a case in another form; 
         FIG. 8  is a bottom view of the push switch with the case in another form; 
         FIG. 9  is an external view of a state where the push switch is inserted in the cut-out section of a wiring board of an electronic device; 
         FIG. 10  is an external view of a push switch with a terminal in another form; 
         FIG. 11  is an external view explaining a state where a push switch with a terminal in another form is loaded on a wiring board of an electronic device; 
         FIG. 12  is an exploded perspective view of a conventional push switch; and 
         FIG. 13  is a side sectional view of a mounted state of the conventional push switch. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiments of the present invention are described below with reference to  FIGS. 1 to 11 . 
       FIG. 1  is an external view of a push switch according to an embodiment of the present invention.  FIG. 2  is an exploded perspective view of the push switch.  FIG. 3  is a side sectional view of the push switch.  FIG. 4  is an external view explaining a state where a wiring board of an electronic device is loaded with the push switch.  FIG. 5  is a plan view of a state where the push switch is inserted in a cut-out section of a wiring board of an electronic device.  FIG. 6  is a side sectional view of a mounted state. 
     A case  21  made of an insulating resin in a substantially rectangular shape seen from above has open-top concave section  21 A at a central section of plate section  21 B. On the inner bottom surface of concave section  21 A, central fixed contact  22  is provided at the center and two outer fixed contacts  23  are provided at symmetrical positions sandwiching central fixed contact  22  by insert molding in an electrically independent manner. Each of terminals  22 A connected to central fixed contact  22  and led outward from case  21  and terminals  23 A connected to outer fixed contacts  23  and led outward from case  21  is also fixed by insert molding by use of an insulating resin. 
     Terminals  22 A and  23 A can be led out at positions set based upon a mean height position as the vicinity of the center in a height direction of each side surface of case  21 , which is above the bottom surface thereof. Terminal  22 A connected to central fixed contact  22  is led out on the rear side and terminal  23 A connected to outer fixed contact  23  is led out on the front side, the terminals taking a horizontal band shape. The inner bottom surface of concave section  21 A of case  21  is set so as to be located below the lower surface positions of terminals  22 A,  23 A. 
     Each of four corner sections of plate section  21 B is provided with corner projecting section  21 C having a substantially L shape and projecting upward, and in an inner base portion of each of four corner projecting sections  21 C, step section  21 D is provided. Each step section  21 D is formed with its upper surface being a plane surface and with a dimension of its height identical to each other at a position higher than the surface of plate section  21 B by a predetermined dimension. 
     Movable contact  24  is made of an elastic metal sheet, has an open-bottom circular dome shape, and is housed inside concave section  21 A of case  21 . The peripheral lower end of the contact is placed on outer fixed contacts  23  and the lower surface of the dome-shaped central section is opposed to central fixed contact  22  with a space formed therebetween. Protective sheet  25  is made of an insulating film, provided with an adhesive, not shown, on its lower surface, and made to adhere to the upper surface of plate section  21 B so as to cover concave section  21 A of case  21 . 
     Numeral  26  denotes an operating body made of an insulating resin, where operating section  26 A located in a projecting manner on the front surface side of case  21  is provided, bar-shaped elastic projection  26 B, with its end formed as pushing section  26 C in substantially spherical shape, is formed in a projecting manner behind operating section  26 A, and frame-shaped sliding section  26 D is provided surrounding the periphery of elastic projection  26 B while forming a space therewith. Sliding section  26 D is placed on step sections  21 D in bases of corner projecting sections  21 C of case  21 , and disposed not in sliding contact with the surface of protective sheet  25  so as to make operating body  26  longitudinally movable. 
     Cover  27  made of a metal plate is disposed on corner projecting sections  21 C of case  21 , and controls upward movement of operating body  26 . The cover is fixed to case  21  while pushing section  26 C at the end of elastic projection  26 B is in a contact state with the front surface of inclined surface  27 A provided in the central portion. 
     Regarding the push switch according to the present embodiment configured as described above, its operation is described below. 
     First, when operating section  26 A of operating body  26  projecting from case  21  is horizontally pushed in backward, sliding section  26 D moves backward on step sections  21 D of case  21 . Pushing section  26 C at the end of elastic projection  26 B, which is in contact with inclined surface  27 A of cover  27 , moves as guided diagonally downward along inclined surface  27 A. Pushing section  26 C moving downward pushes down the dome-shaped central section of movable contact  24  through protective sheet  25 . When the push-down force exceeds elastic reverse force of movable contact  24 , the dome-shaped portion is transformed into a bottom convex shape accompanied by a sense of click, and its lower surface comes into contact with central fixed contact  22 , so that the switch is turned on. 
     When the force having pushed in operating section  26 A is released, movable contact  24  is self-restored to the original dome shape rounded upward, accompanied by a sense of click, and the lower surface of the central section is separated from central fixed contact  22 , so that the switch is turned off. At that time, in receiving upward energizing force due to the self-restoring force of movable contact  24  through protective sheet  25 , pushing section  26 C of operating body  26  is pushed back upward. Pushing section  26 C moves as guided diagonally upward along inclined surface  27 A of cover  27 , and with this movement of pushing section  26 C, sliding section  26 D moves forward on step sections  21 D of case  21 , and operating body  26  returns to the original state. 
     As described above, in the present embodiment, sliding section  26 D of operating body  26  moves on step sections  21 D. Since sliding section  26 D does not move on protective sheet  5  made of an insulating film as in the conventional case, operating body  26  longitudinally moves smoothly with small friction resistance, thereby giving a favorable operational feel with a sense of light click at the time of elastic reversal and self-restoration of movable contact  24 . 
     Next described is a state where the push switch according to the present embodiment is loaded on a wiring board of an electronic device. 
     As shown in  FIG. 4 , numeral  31  denotes a wiring board of an electronic device for loading of the push switch, and at an edge section of the wiring board, rectangular cut-out section  32  is provided with its front side open. At positions corresponding to terminals  22 A,  23 A of the push switch, lands  33  for terminals which are connected to a circuit, not shown, are respectively provided in rectangular shape. 
     Cut-out section  32  is provided for receiving insertion of a portion below the lower surfaces of terminals  22 A,  23 A led out from each side surface of case  21 . Cut-out section  32  is set to have a width slightly larger than a width of case  21  so as to be capable of receiving insertion of case  21  while preventing displacement, and have a depth in dimension approximately the same as a longitudinal dimension of case  21  so as to stabilize the push switch on wiring board  31  while not hindering the operation of pushing in operating section  26 A. 
     The plan view of  FIG. 5  shows the state where the push switch is inserted and disposed. As seen from the drawing, positions of respective lands  33  of wiring board  31  are set such that respective spaces from the back-side end surface of cut-out section  32  to the centers of longitudinal widths of respective lands  33  are shorter than respective spaces from the rear end of case  21  as the portion of the push switch which is inserted into cut-out section  32  to the centers of widths of respective terminals  22 A,  23 A. 
     In other words, the central positions of respective lands  33  are provided at positions slightly displaced backward from the central positions of terminals  22 A,  23 A. The displacement may be set dimensionally to the range of 0.02 mm to 0.2 mm. 
     As thus described, with lands  33  for soldering of the terminals provided in wiring board  31 , condensing force generated in solidification of molten solder at the time of soldering acts so as to position respective terminals  22 A,  23 A at the centers of widths of lands  33 , and hence the push switch is energized toward the back side of cut-out section  32 . As shown in  FIG. 6 , the lower rear end of case  21  inserted into cut-out section  32  comes into close contact with the back-side end surface of cut-out section  32 , and then soldered and fixed, to stabilize the position on wiring board  31 . Further, also when an excessive load is applied to operating section  26 A, that load can be directly received on the end surface of wiring board  31 , so that a mounted state with improved mechanical strength can be easily obtained. 
     As thus described, according to the present embodiment, the portion below terminals  22 A,  23 A led out from the side surface of case  21  can be inserted and mounted into cut-out section  32  provided in wiring board  31  of the electronic device. Therefore, even an excessive load applied to operating section  26 A of operating body  26  can be received on the back-side end surface of cut-out section  32  of wiring board  31  through case  21 , so as to improve mechanical strength more than in the case of the push switch in single use. 
     Further, since the inner bottom surface of concave section  21 A of case  21  is located below the upper surface of wiring board  31  as the soldering position, the height position of operating body  26  is close to the wiring board surface side, so as to obtain a mounted state having a low positional relation. This can suppress a moment of the pressing operation which is applied to the soldered section of each of terminals  22 A,  23 A, leading to more improvement in mechanical strength and suppression of the height from wiring board  31  of the push switch. 
     It is to be noted that the position where each of terminals  22 A,  23 A is led out from case  21  is not restricted to the height position in the vicinity of the center of the side surface, but at any position so long as having a margin for allowing insertion of the portion below each of terminals  22 A,  23 A of case  21  into cut-out section  32  of wiring board  31 . For example, it is more preferable to lead out terminals  22 A,  23 A from the upper height position of the side surface of case  21  since a configuration with a smaller dimension of the height from wiring board  31  can be formed. 
     Moreover, the shape of each of terminals  22 A,  23 A is not restricted to the plane shape, but each of terminals  22 A,  23 A may be of a surface-mounted type in so-called J-bent shape, gull-wing shape, or the like. 
     Next, an example of embodiments with a case in another form is described with reference to  FIGS. 7 to 9 . 
       FIG. 7  is an external view of a push switch with a case in another form.  FIG. 8  is a bottom view of the push switch with the case in another form.  FIG. 9  is an external view of a state where the push switch is inserted in a cut-out section of a wiring board of an electronic device. 
     In the figure, numeral  41  denotes a case with terminals  22 A,  23 A insert-molded and fixed by use of an insulating resin. An operation performed on operating section  26 A located as projecting forward makes operating body  26  longitudinal movable, and from thereabove, cover  27  is fixed. Each of terminals  22 A,  23 A is led out in plane shape at a symmetrical position from a mean height position as approximately the center in a height direction of each side surface of case  41 . 
     With the lower surface position of each of terminals  22 A,  23 A taken as a border, rest section  41 A is configured where an upper portion of each of right and left side sections of case  41  projects outward more than a lower portion thereof. 
     Since other configurations are the same as described above and operations thereof are also the same, descriptions of those configurations are not given. 
     As shown in  FIG. 9 , when the portion below each of terminals  22 A,  23 A of case  41  is brought into the state of being inserted in cut-out section  32  of wiring board  31 , each of terminals  22 A,  23 A comes into the state of being located on land  33 , and also rest section  41 A of case  41  comes into the state of being placed on wiring board  31 . 
     As thus described, in the state of the push switch being inserted in cut-out section  32  of wiring board  31 , the push switch according to the present embodiment can be placed in a larger area and more stably on both sides of case  41  due to rest sections  41 A than a push switch placed on wiring board  31  only with terminals  22 A,  23 A, thereby allowing improvement in mounting operationality. 
     Further, since an exposed area of the lower surface of each of terminals  22 A,  23 A increases, the soldering area increases. It is thereby possible to strengthen mechanical strength after solder-mounting. 
     It should be noted that, from the viewpoint of densifying a component loaded on wiring board  31 , rest section  41 A is preferably provided only in each side surface direction of case  41  so as to make the occupied area small. On the other hand, from the viewpoint of improving the mounting operationality, it may be configured such that rest section  41 A is projected also in the rear surface portion of case  41 . 
     An example of embodiments with a terminal in another form is described with reference to  FIG. 10 . 
       FIG. 10  is an external view of a push switch with a terminal in another form. 
     In the figure, numeral  101  denotes a case with front terminal  102  and rear terminal  103  insert-molded and fixed by use of an insulating resin. An operation performed on operating section  26 A located as projecting forward makes operating body  26  longitudinal movable, and from thereabove, cover  27  is fixed. Each of front terminal  102  and rear terminal  103  is led out in plane shape at a symmetrical position from a mean height position as approximately the center in a height direction of each side surface of case  101 . 
     A width of rear terminal  103  is the same as the widths of those terminals described in  FIGS. 1 to 9 , whereas a width of front terminal  102  is set larger than the width of rear terminal  103 . Further, front terminal  102  is provided with cut-out section  102 A in its end portion. 
     Since other configurations are the same as those described in  FIGS. 1 to 6  and operations thereof are also the same, descriptions of those configurations are not given. 
     Although the moment of the pushing operation is applied more intensely on front terminal  102  side than on rear terminal  103  side, making the width of front terminal  102  larger can expand a soldering area of front terminal  102 , to improve soldering strength. It is thereby possible to increase mechanical strength after solder-mounting against a pushing operation as well as accidentally applied excessive pushing force. 
     Further, since cut-out section  102 A provided at the end of front terminal  102  acts as a solder pool at the time of soldering, it is possible to increase the mechanical strength after solder-mounting. While cut-out section  102 A may be provided in either or both of front terminal  102  and rear terminal  103 , it is preferably provided at the rear edge section of front terminal  102  shown in  FIG. 10 . Further, it may be provided as a through hole inside a terminal width of front terminal  102  or rear terminal  103 . 
     An example of embodiments with a terminal in another form is described with reference to  FIG. 11 . 
       FIG. 11  is an external view explaining a state where a push switch with a terminal in another form is loaded on a wiring board of an electronic device. 
     In the figure, numeral  111  denotes a case with front terminal  112  and rear terminal  113  insert-molded and fixed by use of an insulating resin. An operation performed on operating section  26 A located as projecting forward makes operating body  26  longitudinal movable, and from thereabove, cover  27  is fixed. Each of front terminal  112  and rear terminal  113  is respectively led out in plane shape at a symmetrical position from a mean height position as approximately the center in a height direction of each side surface of case  111 . 
     Front terminal  112  is led out in plane shape from the side surface of case  111 , and its end side is bent downward. 
     Since other configurations are the same as those described in  FIGS. 1 to 6 , and operations thereof are also the same, descriptions of those configurations are not given. 
     As shown in  FIG. 11 , numeral  121  is a wiring board of an electronic device for loading of the push switch, and at an edge section of the wiring board, rectangular cut-out section  122  is provided with its front side open. At a position corresponding to front terminal  112  of the push switch, land  123  provided with a through hole for a terminal which is connected to a circuit, not shown, is provided in rectangular shape. Further, at a position corresponding to rear terminal  113 , land  124  for a terminal which is also connected to the circuit, not shown, is provided in rectangular shape. 
     The push switch mounted on wiring board  121  is soldered with the end side of front terminal  112  in the state of being inserted inside the through hole of land  123 , and is hence firmly fixed. It is thereby possible to further increase mechanical strength after solder mounting against a moment of the pushing operation intensely applied to front terminal  112 . 
     In addition, although not shown, the push switches shown in  FIGS. 10 and 11  may also be provided with rest section  41 A as shown in  FIGS. 7 to 9  in such a manner that, with a lower surface position of each of terminals  102 ,  103 ,  112 ,  113  led out from each of cases  101 ,  111  taken as a border, an upper portion of each of at least right and left side sections of each of cases  101 ,  111  is projected outward more than a lower portion thereof. 
     It is to be noted that, although the shape of the case is rectangular in the embodiments, the present invention is not restricted to the shape of the case. The present invention is applicable to arbitrary shapes such as a polygonal shape and an elliptic shape. 
     The push switch of the present invention has a characteristic of suppressing a height from a wiring board when being in a mounted state without causing deterioration in mechanical strength, and is broadly applicable to a variety of electronic devices having input operating sections.