Patent Publication Number: US-2017359068-A1

Title: Plain-face switch and method for attaching the plain-face switch

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of PCT international application Ser. No. PCT/JP2016/056900 filed on Mar. 4, 2016 which designates the United States, and which claims the benefit of priority from Japanese Patent Application No. 2015-043161, filed on Mar. 5, 2015; the entire contents of which are incorporated herein by reference. 
    
    
     FIELD 
     The present invention relates to a plain-face switch and a method for attaching the plain-face switch. 
     BACKGROUND 
     There are known light switches that are attached to a wall in a mounted state while in use and that may be also used as a remote controller by being removed from the wall (see Patent Literature 1). With the light switch in Patent Literature 1, as the switch is configured by using a capacitance sensor, the switch area is a plain surface. 
     Furthermore, in the case of plain-face switches that have a flat switch surface, it is considered that the switch surface is made flush with the wall so that the design of the wall may be improved. For this purpose, it is necessary to provide the wall with the opening that is equivalent to the outer shape of the switch and with the installation space that has the depth that is equivalent to the depth of the switch. However, there is a problem in that it is difficult to form the installation space that has an accurate outer shape and an accurate depth in the wall. 
     Furthermore, if the existing switch is removed and is replaced with a plain-face switch, there is much less flexibility of the opening and the depth for mounting the plain-face switch; therefore, it is difficult to obtain the installation space that conforms to the outer shape and the depth of the plain-face switch. 
     Furthermore, in the case of for example houses or conference rooms, even if it is possible to form the opening that has an outer shape that is equivalent to the outer shape of the plain-face switch, it is considered that it is extremely difficult to conform to the depth of the plain-face switch as the depth is defined by the distance between the inner wall and the outer wall. 
     The present invention has been made in consideration of the above-described problem, and it has an object to provide a mounted-type plain-face switch that is attachable such that the sensor module is located at the opening and that may be easily provided such that the sensor module is flush with the opening or may be provided such that it is tilted with respect to the opening, and a method for attaching the plain-face switch. 
     SUMMARY 
     A plain-face switch according to an embodiment is the mounted-type plain-face switch that is mounted into an opening, it includes a base unit that is provided at the back of the opening, a sensor module that has a flat sensor surface facing the side of the opening and that is supported by the base unit, and a securing unit that secures the base unit to the bottom surface, which is located at the back of the opening, and the securing unit is capable of adjusting the position or the tilt of the sensor module in the depth direction with respect to the opening such that the edge surface of the sensor module at the side of the opening enters a predetermined state with respect to the opening. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an enlarged perspective view of the neighborhood of a plain-face switch in a case where the plain-face switch according to a first embodiment is provided on a wall in a mounted manner. 
         FIG. 2  is an exploded perspective view of the plain-face switch according to the first embodiment. 
         FIG. 3  is an exploded perspective view of a sensor main body according to the first embodiment. 
         FIG. 4A  is a diagram that illustrates the operation principal of the sensor unit according to the first embodiment, and it is a diagram that illustrates a state where a switch operation is not performed. 
         FIG. 4B  is a diagram that illustrates the operation principal of the sensor unit according to the first embodiment, and it is a diagram that illustrates a state where a switch operation is performed. 
         FIG. 5  is a perspective view of the back surface side of a base unit according to the first embodiment. 
         FIG. 6  is a cross-sectional view that is taken along a line A-A in  FIG. 5 , and it is a diagram from which a part of elastic members are omitted. 
         FIG. 7A  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a perspective view that illustrates an opening being provided on an outer wall. 
         FIG. 7B  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a perspective view that illustrates a thread hole being provided on an inner wall. 
         FIG. 8A  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a perspective view that illustrates a securing step for securing the base unit. 
         FIG. 8B  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a side view when  FIG. 8A  is viewed in the X direction. 
         FIG. 9  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a perspective view that illustrates a supporting step for supporting a sensor module by the base unit. 
         FIG. 10  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a perspective view that illustrates the supporting step for supporting the sensor module by the base unit. 
         FIG. 11A  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a front view that illustrates a state after the supporting step is finished. 
         FIG. 11B  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a side view when  FIG. 11A  is viewed in the Y direction. 
         FIG. 12  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a side view that illustrates the adjustment step for adjusting the sensor module according to the first embodiment to enter a predetermined state. 
         FIG. 13A  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a perspective view that illustrates a state before a packing is attached. 
         FIG. 13B  is a diagram that illustrates the method for attaching the plain-face switch according to the first embodiment, and it is a perspective view that illustrates a state after a packing is attached. 
         FIG. 14A  is a diagram that illustrates the method for attaching the plain-face switch according to a second embodiment, and it is a perspective view that illustrates an opening being provided on the outer wall. 
         FIG. 14B  is a diagram that illustrates the method for attaching the plain-face switch according to the second embodiment, and it is a perspective view that illustrates a guide pin being provided on the inner wall. 
         FIG. 15  is a diagram that illustrates the method for attaching the plain-face switch according to the second embodiment, and it is a side view that illustrates a state where the base unit is placed on the inner wall through the guide pin. 
         FIG. 16  is a diagram that illustrates the method for attaching the plain-face switch according to the second embodiment, and it is a side view that illustrates a state where the end of the guide pin is provided with an adhesive agent. 
         FIG. 17  is a diagram that illustrates the method for attaching the plain-face switch according to the second embodiment, and it is a side view that illustrates a state after the supporting step is finished. 
         FIG. 18  is a diagram that illustrates the method for attaching the plain-face switch according to the second embodiment, and it is a side view that illustrates the adjustment step for adjusting the sensor module to enter a predetermined state. 
         FIG. 19  is an exploded perspective view that illustrates a modification of the sensor module. 
         FIG. 20  is a perspective view when the base unit according to the modification of the first and the second embodiments is viewed from the front side. 
         FIG. 21  is a perspective view when the base unit according to the modification of the first and the second embodiments is viewed from the back surface. 
     
    
    
     DETAILED DESCRIPTION 
     A detailed explanation is given below of the configuration (referred to as “embodiment” below) for implementing the present invention with reference to the attached drawings. Furthermore, the same elements are attached with the same number in the entire explanation of embodiments. 
     First Embodiment 
       FIG. 1  is a diagram that illustrates a case where a mounted-type plain-face switch  10  according to a first embodiment is provided on a wall surface of a house, or the like, in a mounted manner, and it is an enlarged perspective view of the enlarged neighborhood of the plain-face switch  10 . As illustrated in  FIG. 1 , the plain-face switch  10  is provided on an inner wall  2  such that it is substantially flush with an opening  1   a  of an outer wall  1 . Furthermore, the plain-face switch  10  includes a packing  20  that covers the clearance with the opening  1   a  of the outer wall  1 . 
     Here, with regard to the XYZ axes that are illustrated in  FIG. 1 , the Z axis indicates the front-back direction of the depth of the opening  1   a  (i.e., the direction from the inner wall  2  toward the outer wall  1  or from the outer wall  1  toward the inner wall  2 ), the X axis indicates the up-and-down direction in a state where the plain-face switch  10  is provided on the wall surface, and the Y axis indicates the right-and-left direction in a state where the plain-face switch  10  is provided on the wall surface. 
     If the XYZ axes are illustrated in the subsequent figures, the XYZ axes are described according to the foregoing, and the direction along the X axis is sometimes referred to as the X direction, the direction along the Y axis as the Y direction, and the direction along the Z axis as the Z direction. 
       FIG. 2  is an exploded perspective view that illustrates only the plain-face switch  10 . Here,  FIG. 2  illustrates the plain-face switch  10  laterally although it is illustrated longitudinally in  FIG. 1 . Specifically, as illustrated with the XYZ axes in  FIG. 2 , the up-and-down direction (the Y direction) in  FIG. 2  is the right-and-left direction (the Y direction) when the plain-face switch  10  is provided on the wall surface in  FIG. 1 , and the Z direction from the upper right side of  FIG. 2  toward the lower left side is the front-back direction (the Z direction) of the opening  1   a  in  FIG. 1 , and the X direction from the upper left side of  FIG. 2  toward the lower right side is the up-and-down direction (the X direction) when the plain-face switch  10  is provided on the wall surface in  FIG. 1 . 
     As illustrated in  FIG. 2 , the plain-face switch  10  includes the packing  20 , a sensor module  30 , a spacer  40 , a switch box  50 , and a base unit  60 . 
     Packing 
     The packing  20  covers the clearance between the opening  1   a  (see  FIG. 1 ) of the outer wall  1  and the sensor module  30 ; its material is not particularly limited, and a material, such as hard rubber, is used to form it. 
     Sensor Module 
     As illustrated in  FIG. 2 , the sensor module  30  includes a cover unit  31  and a sensor main body  32 . 
     Cover Unit 
     The cover unit  31  is provided in the sensor module  30  at the side of the opening  1   a  (see  FIG. 1 ) of the outer wall  1 , and it has a function to protect a sensor of the sensor main body  32 . 
     Furthermore, in the cover unit  31 , a back surface  31   a , which is on the side of the sensor module  30 , and a front surface  31   b , which is on the opposite side, are flat surfaces, and when the sensor module  30  is positioned on the opening  1   a  (see  FIG. 1 ) of the outer wall  1 , it may be substantially flush with the opening  1   a  of the outer wall  1 . 
     Here, according to the present embodiment, the front surface  31   b  of the cover unit  31  is an edge surface of the sensor module  30  at the side of the opening  1   a ; however, if the cover unit  31  is not provided and the sensor module  30  includes only the sensor main body  32 , an edge surface of the sensor main body  32  at the side of the opening  1   a  is an edge surface of the sensor module  30  at the side of the opening  1   a.    
     Furthermore, according to the present embodiment, the mark of the switch is illustrated on the front surface  31   b  of the cover unit  31  such that it is aligned with the position of the sensor of the sensor main body  32  so that it is possible to know where the switch is on the outer wall  1 . Here, the mark of the switch may be illustrated on the front surface  31   b  of the cover unit  31  not only by printing but also by providing concavity and convexity on the front surface  31   b  of the cover unit  31 , for example, by carving. Therefore, the front surface  31   b  of the cover unit  31  being a flat surface does not mean that there are no concavity and convexity at all on the surface, but it means that the front surface  31   b  is a flat surface when it is viewed as a whole. 
     Sensor Main Body 
       FIG. 3  is an exploded perspective view that illustrates only the sensor main body  32 . Here, as illustrated with the XYZ axes,  FIG. 3  also has an illustration laterally in the same manner as in  FIG. 2 , contrary to the longitudinal illustration in  FIG. 1 . As illustrated in  FIG. 3 , the sensor main body  32  includes a capacitance-type sensor unit  33 , a securing plate  34 , and a securing box  35 . 
     According to the present embodiment, as the capacitance-type sensor unit  33  is used, the sensor surface of the sensor unit  33 , which face the side of the opening  1   a , is a flat surface. If the finger of a person, or the like, is located close, the sensor unit  33  detects it and performs an operation to turn on or off the switch. 
     The used sensor unit  33  according to the present embodiment is based on detection of changes in the capacitance (the line of electric force). More specifically, as illustrated in  FIG. 4A , the sensor unit  33  includes a drive line  36   a , a sensor line  36   b , and a ground  36   c . Furthermore, an electric field occurs among the drive line  36   a , the sensor line  36   b , and the ground  36   c , and the state of the electric field is represented by using an arrow that is the line of electric force in  FIG. 4A  and  FIG. 4B  that is described below. 
     In this state, as illustrated in  FIG. 4B , when a person&#39;s finger  36   d  is located close, the line of electric force is pulled toward the finger  36   d , and the number of lines of electric force to the sensor line  36   b  is decreased. By detecting a decrease in the lines of electric force, i.e., a change in the capacitance, it is detected whether an operation of the switch is performed. 
     Furthermore, other capacitance-type sensor units may be used; however, in the case of the above-described sensor unit  33  that detects changes in the line of electric force according to the present embodiment, even if the finger  36   d  is separated from the sensor front surface, the finger  36   d  may be detected when it is located nearby. 
     Therefore, design flexibility of the cover unit  31  may be improved, such as increasing the thickness of the cover unit  31 , as compared to a capacitance-type sensor unit for which there is a need to bring the finger  36   d  close such that the finger  36   d  is in contact with the sensor front surface. 
     Furthermore, it may be detected that the finger  36   d  is located nearby if there is a space (air layer), or the like, between the cover unit  31  and the sensor front surface. Therefore, it is not necessary to care about the space that is formed between the cover unit  31  and the sensor unit  33  during assembling, and the plain-face switch  10  without the need of severer dimensional management or high assembly accuracy may be configured. 
     An explanation of the sensor main body  32  is continued with reference back to  FIG. 3 . As illustrated in  FIG. 3 , the securing box  35  is provided with a space  37 . In the space  37 , a controller A is arranged, which is provided on the back surface of the securing plate  34 , located on the opposite of the front surface that faces the sensor unit  33 . Here,  FIG. 3  illustrates only the connector section of the controller A, which is connected to the sensor unit  33 . 
     Furthermore, the securing box  35  is provided with thread fastening holes  35   a ,  35   b  on both edges in the X direction. Moreover, undepicted internal thread structures (helical grooves), which correspond to the external thread structure of a thread, are formed on the inner circumferences of the thread fastening holes  35   a ,  35   b.    
     Furthermore, thread holes  34   a ,  34   b  are provided on both edges of the securing plate  34  in the X direction, and tapered flanges, which receive threads  38   a ,  38   b , are provided on the circumferential edges of the thread holes  34   a ,  34   b.    
     Therefore, the securing plate  34  may be secured to the securing box  35  as described below. First, the securing plate  34  with the controller A attached to the back surface of the securing plate  34  is mounted on the securing box  35  such that the controller A is located in the space  37  of the securing box  35 . 
     Next, as indicated by the dashed-dotted line in  FIG. 3 , the threads  38   a ,  38   b  are inserted into the thread holes  34   a ,  34   b  of the securing plate  34  from the front surface side, and the threads  38   a ,  38   b  are engaged with the thread fastening holes  35   a ,  35   b  of the securing box  35 ; thus, securing of the securing plate  34  to the securing box  35  is completed. 
     Furthermore, as illustrated in  FIG. 3 , the sensor unit  33  is provided with a pair of thread holes  33   a ,  33   b  on both edges in the Y direction, and tapered flanges, which receive threads  38   c ,  38   d , are provided on the circumferential edges of the thread holes  33   a ,  33   b.    
     Furthermore, the securing plate  34  is provided with a pair of thread fastening holes  34   c ,  34   d  on both edges in the Y direction. Moreover, undepicted internal thread structures (helical grooves), which correspond to the external thread structures of the threads  38   c ,  38   d , are formed on the inner circumferences of the thread fastening holes  34   c ,  34   d.    
     Therefore, by using the threads  38   c ,  38   d , the sensor unit  33  may be secured to the securing plate  34 , which is secured to the securing box  35  as described above. 
     More specifically, first, the sensor unit  33  is mounted on the securing plate  34 , which is secured to the securing box  35 . 
     Next, as indicated by the dashed-dotted line in  FIG. 3 , the threads  38   c ,  38   d  are inserted into the thread holes  33   a ,  33   b  from the front surface side of the sensor unit  33 , which is on the opposite side of the side of the securing plate  34 , and the threads  38   c ,  38   d  are engaged with the thread fastening holes  34   c ,  34   d  of the securing plate  34 ; thus, securing of the sensor unit  33  to the securing plate  34  is completed. Furthermore, when the sensor unit  33  is mounted on the securing plate  34 , the sensor unit  33  is connected to the connector section of the controller A. 
     As described above, when the sensor unit  33 , the securing plate  34 , and the securing box  35  are assembled, the sensor main body  32  is obtained as illustrated in  FIG. 2 . 
     Spacer 
     The spacer  40  is a component that secures the sensor main body  32  to the switch box  50 . According to the present embodiment, as the spacer  40 , a pair of spacers  40   a ,  40   b  is provided, which corresponds to a pair of thread fastening holes  50   a ,  50   b  of the switch box  50 , as illustrated in  FIG. 2 . The spacers  40   a ,  40   b  are provided with thread holes  41   a ,  41   b , respectively, and tapered flanges, which receive threads  42   a ,  42   b , are provided on the circumferential edges of the thread holes  41   a ,  41   b.    
     Furthermore, undepicted internal thread structures (helical grooves), which correspond to the external thread structures of the threads  42   a ,  42   b , are formed on the inner circumferences of the thread fastening holes  50   a ,  50   b  in pair in the switch box  50 . 
     Therefore, as indicated by the dashed-dotted line in  FIG. 2 , the threads  42   a ,  42   b  are inserted into the thread holes  41   a ,  41   b  of the spacers  40   a ,  40   b , respectively, and the threads  42   a ,  42   b  are engaged with the thread fastening holes  50   a ,  50   b  of the switch box  50 , whereby the spacers  40   a ,  40   b  are secured to the switch box  50 . 
     Here, each of the spacers  40   a ,  40   b  is provided with a pair of thread fastening holes on the top and the bottom as viewed in the drawing. More specifically, the spacer  40   a  is provided with a pair of thread fastening holes  43   a ,  43   b  on the top and the bottom as viewed in the drawing, and the spacer  40   b  is provided with a pair of thread fastening holes  43   c ,  43   d  on the top and the bottom as viewed in the drawing. 
     Furthermore, undepicted internal thread structures (helical grooves), which correspond to the external thread structure of the threads  39   a ,  39   b ,  39   c , and  39   d , are formed on the inner circumferences of the thread fastening holes  43   a ,  43   b ,  43   c , and  43   d.    
     Furthermore, the sensor main body  32  is provided with thread holes, through which the threads  39   a ,  39   b ,  39   c , and  39   d  are inserted, on four corners. Moreover, as it is understood from the illustration of the securing box  35  in  FIG. 3 , tapered flanges, which receive the threads  39   a ,  39   b ,  39   c , and  39   d , are provided on the hole circumferential edges of the thread holes on the four corners. 
     Therefore, as described above, after the spacers  40   a ,  40   b  are secured to the switch box  50 , the threads  39   a ,  39   b ,  39   c , and  39   d  are inserted into the thread holes on the four corners of the sensor main body  32 , and the threads  39   a ,  39   b ,  39   c , and  39   d  are engaged with the thread fastening holes  43   a ,  43   b ,  43   c , and  43   d  of the spacers  40   a ,  40   b , as indicated by the dashed-dotted line in  FIG. 2 , whereby the sensor main body  32  is secured to the switch box  50 . 
     Switch box 
     As illustrated in  FIG. 2 , the switch box  50  is a member that is attached to a plane section  61  of the base unit  60 . More specifically, holding pieces  62   a ,  62   b  and  62   c ,  62   d  are provided as two pairs such that they are separated in the X direction, they are arranged on the surface (on the left side in the Z direction in  FIG. 2 ) of the plane section  61 , which faces the opening  1   a  (see  FIG. 1 ) of the outer wall  1 , they make a pair on two sides of the plane section  61  of the base unit  60  in the Y direction, and the holding pieces  62   a ,  62   b  and  62   c ,  62   d  hold two side walls  52   a ,  52   b  of the switch box  50  in the Y direction, whereby the switch box  50  is attached to the base unit  60 . 
     Therefore, according to the present embodiment, the sensor main body  32  is supported by the base unit  60  via the switch box  50 . However, a configuration may be such that the base unit  60  itself is provided with a structure for securing the sensor main body  32  and the sensor main body  32  is directly supported by the base unit  60 . 
     As the switch box  50  according to the present embodiment, a commercially available switch box, which conforms to the standard of JIS, is used. Therefore, for example, if the existing switch is replaced with the plain-face switch according to the present embodiment, the existing switch box may be reused. Furthermore, with this configuration, the base unit  60  itself may be manufactured in conformity to the typical switch box  50 ; thus, general versatility of the base unit  60  may be improved. 
     Base Unit 
     As illustrated in  FIG. 2 , the base unit  60  includes the plane section  61  and leg sections  63   a ,  63   b  that are provided on at least two opposing sides of the plane section  61 . According to the present embodiment, the leg sections  63   a ,  63   b  are provided on two sides, opposing in the Y direction, of the plane section  61 . 
     In  FIG. 2 , as described above, the right side of the figure in the Z direction is in the depth direction of the opening  1   a  of the outer wall  1  in  FIG. 1 . Therefore, the leg sections  63   a ,  63   b  are formed such that they extend on the side of the inner wall  2 , illustrated in  FIG. 1 , i.e., on the side of the bottom surface for the opening  1   a . Furthermore, the plane section  61  is provided with a switch-box support section  64  that supports the switch box  50  on the right side in the X direction. 
     The right side in the X direction in  FIG. 2  is the lower side in the X direction in  FIG. 1 ; therefore, it is equivalent to the lower side when the plain-face switch  10  is mounted on the wall surface. Therefore, in a state where the switch box  50  is actually attached to the wall surface, it is supported at the lower side by the switch-box support section  64  of the base unit  60 . 
     In this way, the switch box  50  is secured to the base unit  60  not only by the holding pieces  62   a ,  62   b  and  62   c ,  62   d  of the base unit  60  but also by being supported by the switch-box support section  64  at the bottom. As a result, the switch box  50  is secured to the base unit  60  in a more stable manner as compared to the case where it is secured by only the holding pieces  62   a ,  62   b  and  62   c ,  62   d.    
     Furthermore, as described below in detail, the base unit  60  is a securing unit that is capable of adjusting the position and the tilt of the sensor module  30  in the depth direction with respect to the opening  1   a  (see  FIG. 1 ), and it is secured to the inner wall  2  that is located at the back of the opening  1   a , illustrated in  FIG. 1 . 
     A detailed explanation is given below of the configuration of the securing unit according to the first embodiment which is capable of adjusting the position and the tilt in the depth direction.  FIG. 5  is a perspective view of the base unit  60  when it is viewed from the side of the inner wall  2 , which is at the back of the opening  1   a  in  FIG. 1 , after the base unit  60 , illustrated in  FIG. 2 , is turned over in the front-back direction (the direction along the Z direction). That is,  FIG. 5  is a perspective view that illustrates the side of the back surface of the plane section  61  in the base unit  60 , and in  FIG. 5 , the left side in the Z direction is the side of the inner wall  2 , and the right side in the Z direction is the side of the opening  1   a.    
     Here, the present embodiment describes the case where the plain-face switch  10  is secured to the inner wall  2 , which is located at the back of the opening  1   a ; however, the area where the plain-face switch  10  is secured is not necessarily the inner wall  2  and therefore the inner wall  2  is described below as the bottom surface that is located at the back of the opening  1   a . Furthermore, as the bottom surface according to the present embodiment is the inner wall  2 , the bottom surface (the inner wall  2 ) is mentioned in the description. 
     As illustrated in  FIG. 5 , the base unit  60  is provided with four elastic members  70   a ,  70   b ,  70   c , and  70   d , which are coil springs and which are arranged on four corners with reference to the center of the back surface of the plane section  61 . 
     Here, the four corners do not mean the absolute edges but they mean the positions that are offset to four corner sides with reference to the center of the plane section  61  so as to receive the plane section  61  in a well-balanced manner when it is received. Furthermore, although coil springs are used as the elastic members  70   a ,  70   b ,  70   c , and  70   d  according to the present embodiment, there is not necessarily limitation on coil springs. 
     Furthermore, the lengths of the used elastic members  70   a ,  70   b ,  70   c , and  70   d , i.e., coil springs, are longer than the lengths of the leg sections  63   a ,  63   b  of the base unit  60  in a state where they are fully stretched without any loads being applied. 
       FIG. 6  is a cross-sectional view that is taken along a line A-A in  FIG. 5 . In  FIG. 6 , the upper side in the Z direction is the side of the opening  1   a  in  FIG. 1 , and the lower side in the Z direction is the side of the bottom surface (the inner wall  2 ) in  FIG. 1 . Furthermore, in  FIG. 6 , the left side in the X direction is the lower side in the X direction in  FIG. 1  and it is the right side in the X direction in  FIG. 5 , and the right side in the X direction is the upper side in the X direction in  FIG. 1  and it is the left side in the X direction in  FIG. 5 . 
     In  FIG. 6 , the elastic member  70   d  is removed so that the structure for attaching the elastic member, provided on the base unit  60 , may be understood. Specifically, the base unit  60  includes a protruding section  72   d  that protrudes from the plane section  61  toward the bottom surface (the inner wall  2 ) so that one end of the elastic member  70   d  (coil spring) is fitted therewith. 
     Furthermore, the protruding section  72   d  is provided with a locking projection  73   d  that is formed to be slightly larger than the inner diameter of the elastic member  70   d  (coil spring) to lock the elastic member  70   d  (coil spring). 
     Thus, the elastic member  70   d  (coil spring) is pushed over the locking projection  73   d  and the elastic member  70   d  (coil spring) is locked, whereby the elastic member  70   d  is prevented from being pulled out of the protruding section  72   d . Furthermore, the other elastic members  70   a ,  70   b , and  70   c  are secured to the plane section  61  of the base unit  60  with the protruding sections that have the same structure. 
     In this manner, during an operation to install the plain-face switch  10 , the elastic members  70   a ,  70   b ,  70   c ,  70   d  are prevented from being separated from the base unit  60 , whereby the operating efficiency of the operation to install the plain-face switch  10  may be improved. 
     Furthermore, as illustrated in  FIG. 5 , the ends of the leg sections  63   a ,  63   b  are bent sections  65   a ,  65   b  that are bent so as to conform with the bottom surface (the inner wall  2 ) to which the base unit  60  is secured. Moreover, each of the bent sections  65   a ,  65   b  is provided with two thread holes, through which a thread is inserted. 
     Specifically, the bent section  65   a  is provided with thread holes  66   a ,  66   c , the bent section  65   b  is provided with thread holes  66   b ,  66   d , and the thread holes  66   a ,  66   b ,  66   c , and  66   d  are provided on the leg sections  63   a ,  63   b  such that they conform to the neighborhoods of the four corners of the plane section  61 . 
     Furthermore, threads are used as securing members for securing the base unit  60  to the bottom surface (the inner wall  2 ), and the threads are screwed into the bottom surface (the inner wall  2 ) through the thread holes  66   a ,  66   b ,  66   c , and  66   d  so that the base unit  60  is secured to the bottom surface (the inner wall  2 ). 
     Here, as described above, the used elastic members  70   a ,  70   b ,  70   c , and  70   d  are longer than the lengths of the leg sections  63   a ,  63   b  of the base unit  60  in a state where they are fully stretched without any loads being applied, although the secured state is described in detail later. 
     Therefore, without screwing the threads until a state is such that the bent section  65   a  of the leg section  63   a  and the bent section  65   b  of the leg section  63   b  are brought into contact with the bottom surface (the inner wall  2 ), a state is obtained such that the base unit  60  is fixed due to the biasing forces of the elastic members  70   a ,  70   b ,  70   c , and  70   d  that are provided between the bottom surface (the inner wall  2 ) and the base unit  60  (the plane section  61 ). 
     In this way, as the securing unit is made up of the elastic members  70   a ,  70   b ,  70   c , and  70   d  and the securing member (thread), the base unit  60  may be fixed in a state (floating state) where it is separated from the bottom surface (the inner wall  2 ) and, by changing the screwing degree of each thread, the position and the tilt in the depth direction may be changed. 
     Furthermore, changes in the position and the tilt in the depth direction mean changes in the position and the tilt of the sensor module  30 , supported by the base unit  60 , in the depth direction. That is, the securing unit, including the elastic members  70   a ,  70   b ,  70   c , and  70   d  and the threads as securing members, according to the present embodiment is the securing unit that is capable of adjusting the position and the tilt of the sensor module  30  in the depth direction with respect to the opening  1   a  such that, for example, a predetermined state is obtained such that the edge surface of the sensor module  30  at the side of the opening  1   a  is flush with the opening  1   a  or a predetermined state is obtained such that it is tilted with respect to the opening  1   a.    
     With reference to  FIGS. 7A  to  FIG. 13B , an explanation is given of the method for securing the mounted-type plain-face switch  10  that is configured as described above according to the first embodiment. First, as illustrated in  FIG. 7A , the opening  1   a  is formed on the outer wall  1 . At this point, as illustrated in  FIG. 7B , four thread holes  2   a  for screwing the securing members (threads) to secure the base unit  60  (not illustrated) through the opening  1   a  (not illustrated) are formed on the bottom surface (the inner wall  2 ). Here,  FIG. 7B  omits the illustration of the outer wall  1  to make it easier to understand the state of the bottom surface (the inner wall  2 ). Hereafter, although the outer wall  1  is sometimes omitted to principally illustrate the state of the bottom surface (the inner wall  2 ), it should be noted that the outer wall  1  is present in actuality. 
     If the bottom surface (the inner wall  2 ) is a material, such as wood, which may be processed relatively easily, the thread hole  2   a  does not need to be provided with an internal thread structure (helical groove) on its inner circumference, and a hole only has to be formed as an opening, through which a thread starts to be inserted. Furthermore, for example, in a case where the existing switch is replaced with the plain-face switch  10 , as there is the opening  1   a  of the outer wall  1 , illustrated in  FIG. 7A , there is no need for the task of forming the opening  1   a  in such a case, and the thread hole  2   a  only has to be provided on the bottom surface (the inner wall  2 ) as illustrated in  FIG. 7B . 
     Next, as indicated by the thick arrow in  FIG. 8A , the securing step is performed to secure the base unit  60  to the bottom surface (the inner wall  2 ) at the back of the opening  1   a  (not illustrated) with the securing unit, which includes the elastic member (coil spring) and the securing member (thread). Here, in  FIG. 8A , the illustration of the outer wall  1  is omitted. 
     More specifically, the thread holes  66   a ,  66   b ,  66   c , and  66   d  (see  FIG. 5 ) of the base unit  60  are positioned on the inner wall  2  such that they are aligned with the positions of the thread holes  2   a  of the inner wall  2 , illustrated in  FIG. 7B , and threads  2   b  (securing members) are screwed into the thread holes  2   a  of the bottom surface (the inner wall  2 ) such that they are inserted into the thread holes  66   a ,  66   b ,  66   c , and  66   d  of the base unit  60 , whereby a temporarily secured state is obtained. 
       FIG. 8B  is the side view when the side surface in the temporarily secured state along the Y direction in  FIG. 8A  is viewed from the side of the arrow P. As illustrated in  FIG. 8B , the base unit  60  is temporarily secured in the state (floating state) separated from the bottom surface (the inner wall  2 ) with the securing unit that includes the elastic members  70   a ,  70   b ,  70   c ,  70   d , which bias the base unit  60  in a direction away from the bottom surface (the inner wall  2 ), and the securing member (the thread  2   b ). 
     After the securing step to secure the base unit  60  is finished, the supporting step is then performed to cause the base unit  60  to support the sensor module  30 , as illustrated in  FIG. 9  and  FIG. 10 . 
     More specifically, as described above, after the step is performed to attach the sensor main body  32  to the switch box  50 , the step is performed to attach the switch box  50  to the base unit  60 , as indicated by the thick arrow in  FIG. 9 . Then, as indicated by the thick arrow in  FIG. 10 , the step is performed to attach the cover unit  31  to the sensor main body  32 , whereby the supporting step is performed to support the sensor module  30  by the base unit  60 . Furthermore, in the case of the sensor module  30  that does not include the cover unit  31  but includes only the sensor main body  32 , the step to attach the cover unit  31  is omitted from the supporting step. 
       FIG. 11A  and  FIG. 11B  are diagrams that illustrate the state where the supporting step to support the sensor module  30  by the base unit  60  is finished.  FIG. 11A  is a front view when the outer wall  1  is viewed from the front side, and  FIG. 11B  is a side view when the side surface along the Y direction in  FIG. 11A  is viewed from the side of the arrow Q. 
     As illustrated in  FIG. 11A , there is a clearance between the opening  1   a  of the outer wall  1  and the sensor module  30  to such a degree that the thread  2   b , which is a securing member, can be seen, and a state is obtained such that the thread  2   b  may be screwed with a driver, or the like, through the clearance. 
     Furthermore, as illustrated in  FIG. 11B , a state is obtained such that part (the cover unit  31 ) of the sensor module  30  slightly protrudes from the opening  1   a  (see  FIG. 11A ) toward the upper side in the Z direction. Here,  FIG. 11B  illustrates a case where the cover unit  31  slightly protrudes from the opening  1   a ; however, if the screwing degree of the thread  2   b  is large at the time of temporary securing, there is an opposite case where the cover unit  31  is retracted to the back side, i.e., toward the bottom surface (the inner wall  2 ), from the opening  1   a.    
     Therefore, next, an adjustment step is performed to adjust the secured state of the securing member (the thread  2   b ) such that the sensor module  30  is in a predetermined state. More specifically, for example, the screwing degree of the thread  2   b , which is a securing member, with respect to the bottom surface (the inner wall  2 ) is adjusted by using a driver, or the like, so that the cover unit  31 , including the flat surface that is located at the opening  1   a  for the sensor module  30 , becomes flush with the opening  1   a  (the outer wall  1 ) as in the state of  FIG. 11B  to the state illustrated in  FIG. 12 . 
     That is, the adjustment step is a step at which the secured state of the base unit  60  is adjusted by the securing unit, which includes the elastic members  70   a ,  70   b ,  70   c ,  70   d  and the securing member (the thread  2   b ), more specifically, the secured state (the screwing degree with respect to the bottom surface (the inner wall  2 )) of the securing member (the thread  2   b ) is adjusted such that the position and the tilt of the sensor module  30  in the depth direction with respect to the opening  1   a  is adjusted so that the edge surface (the front surface  31   b  of the cover unit  31  according to the present embodiment) of the sensor module  30  at the side of the opening  1   a  is in a predetermined state (the state of being flush according to the present embodiment) with respect to the opening  1   a.    
     Furthermore, the present embodiment illustrates a case where the predetermined state is that the sensor module  30  is flush with the opening  1   a  (the outer wall  1 ); however, for example, in a case where the installation area of the plain-face switch  10  is near the floor of a room, if it is slightly tilted upward, the operability of the switch is likely to be improved. In this case, the predetermined state may be a state of being slightly tilted upward. 
     Furthermore, to obtain flushness, or the like, it is considered that adjustment of the tilt is typically accompanied; however, if there is a need for only adjustment of the depth or conversely if there is a need for only adjustment of the tilt, only the needed adjustment has to be performed, and therefore the adjustment step is sometimes the step to adjust the position or the tilt in the depth direction. 
     In this way, after the predetermined state is obtained, finally, the packing  20  is attached such that the clearance between the sensor module  30  and the opening  1   a  is covered, as illustrated in  FIG. 13A , and after the clearance is covered with the packing  20  as illustrated in  FIG. 13B , attachment of the plain-face switch  10  is finished. Furthermore, after attachment of the plain-face switch  10  is finished, wallpaper, or the like, which is provided with an opening that has such a size that only the sensor module  30  is visible, may be provided on the outer wall  1  so that the packing  20  is not visible. 
     As described above, with the mounted-type plain-face switch  10  according to the present embodiment, the plain-face switch  10  may be easily secured such that it is flush with the opening  1   a , and the design may be improved. Furthermore, the plain-face switch  10  may be easily secured such that it is tilted with respect to the opening  1   a.    
     In the case that is stated in the above description, the plain-face switch  10  is provided on a wall of a house, a conference room, or the like; however, the plain-face switch  10  may be provided on furniture, such as desk or shelf. As for the type of usage of the switch, it may be used as a light switch and it may be also used as a switch for other devices for air conditioning, or the like. 
     In the plain-face switch  10  according to the first embodiment, the base unit  60  is in the state (floating state) where it is separated from the bottom surface (the inner wall  2 ) even in the mounted state. Therefore, to prevent the entire plain-face switch  10  from being moved due to the movement of the base unit  60  when the plain-face switch  10  is pushed, it is preferable that the elastic members  70   a ,  70   b ,  70   c ,  70   d  have such an elastic force that the base unit  60  is immovable even when the plain-face switch  10  is pushed. 
     Second Embodiment 
     According to the first embodiment, the thread  2   b  is used as the securing member for securing the base unit  60  to the bottom surface (the inner wall  2 ); however, as described below in specific, a second embodiment is different in that, instead of the thread  2   b , the configuration of the securing member includes a guide pin, which is provided on the bottom surface (the inner wall  2 ), and an adhesive agent, and it is the same as the first embodiment in other aspects. 
     A specific explanation is given below of the configuration of the securing member, which includes the guide pin and the adhesive agent, by stating the different aspect from the attachment method according to the first embodiment.  FIG. 14A  and  FIG. 14B  are equivalent to  FIG. 7A  and  FIG. 7B , respectively. 
     First, in the same manner as in the first embodiment, illustrated in  FIG. 7A , the opening  1   a  is formed on the outer wall  1  according to the second embodiment, too, as illustrated in  FIG. 14A . Here, according to the first embodiment, as explained with reference to  FIG. 7B , the thread holes  2   a  are formed on the inner wall  2 ; however, according to the second embodiment, as illustrated in  FIG. 14B , guide pins  2   c  are provided at the positions that correspond to the thread holes  2   a.    
     Then, the guide pins  2   c  are inserted into guide pin holes that are provided in the same manner as the thread holes  66   a ,  66   b ,  66   c , and  66   d  (see  FIG. 5 ) of the base unit  60 , explained in the first embodiment, so that the base unit  60  is mounted on the bottom surface (the inner wall  2 ). Here, the inner diameter of the guide pin hole has a size similar to the outer diameter of the guide pin  2   c  so that backlash of the base unit  60  may be prevented. Then, as illustrated in the figure that is equivalent to  FIG. 8B , a state is obtained such that the end of the guide pin  2   c  is projected from the guide pin hole, as illustrated in  FIG. 15 , and therefore the end of the guide pin  2   c  is coated with an adhesive agent  3   a , as illustrated in  FIG. 16 . 
     Then, at the same steps as those in the first embodiment, the sensor module  30  is supported by the base unit  60 . The state where attachment of the sensor module  30  is finished, i.e., the state that is equivalent to  FIG. 11B  according to the first embodiment, is as illustrated in  FIG. 17 , and a state is obtained such that part (the cover unit  31 ) of the sensor module  30  is slightly projected from the opening  1   a.    
     Next, the adjustment step is performed to adjust the secured state of the securing member such that the sensor module  30  enters a predetermined state; however, according to the second embodiment, instead of adjusting the secured state of the securing member (the thread  2   b ) as explained in the first embodiment, the adjustment step is changed as illustrated in  FIG. 18 . 
     Specifically, as illustrated in  FIG. 18 , a flat plate  80 , which is placed on the outer wall  1 , is used, and the flat plate  80  allows part (the cover unit  31 ) of the sensor module  30 , projected from the opening  1   a  as illustrated in  FIG. 17 , to be flush with the opening  1   a  (the outer wall  1 ). In this way, the predetermined state where it is flush with the opening  1   a  (the outer wall  1 ) is retained until the adhesive agent  3   a  becomes hardened. 
     That is, a change is made so that adjustment of the secured state of the securing member is conducted such that, although the screwing degree of the thread  2   b , which is a securing member, with respect to the bottom surface (the inner wall  2 ) is adjusted according to the first embodiment, the edge surface (the front surface  31   b  of the cover unit  31  according to the present embodiment) of the sensor module  30  at the side of the opening  1   a  is retained at the predetermined state (the state of being flush according to the present embodiment) with respect to the opening  1   a  while the adhesive agent becomes hardened according to the second embodiment. 
     Even if the flat plate  80  is removed after the adhesive agent  3   a  is hardened, part (the cover unit  31 ) of the sensor module  30  does not protrude from the opening  1   a  again, and the task of attaching the plain-face switch  10  according to the second embodiment is finished. 
     As described above, in the case of the second embodiment, as there is no need for the task of adjusting the screwing degree of the thread  2   b  by inserting the driver as in the first embodiment, the size of the opening  1   a  may be equal to the size of the sensor module  30 , more specifically, the size of the cover unit  31 . Therefore, it is not necessary to cover the clearance with the packing  20  as in the first embodiment. 
     Furthermore, if the size of the opening  1   a  is equal to the outer shape of the cover unit  31 , the task of inserting the base unit  60  to the back of the opening  1   a  through the opening  1   a  may be performed such that the base unit  60  is tilted with respect to the opening  1   a  so that the bent section  65   a  (see  FIG. 5 ) of the leg section  63   a  of the base unit  60  and the bent section  65   b  (see  FIG. 5 ) of the leg section  63   b  are not obstructed by the opening  1   a . Furthermore, according to the second embodiment, if the sensor module  30  needs to be slightly tilted, the tilted state may be retained until the adhesive agent  3   a  becomes hardened. 
     The present invention has been explained above on the basis of the embodiments; however, the present invention is not limited to the embodiments, and various modifications may be made without departing from the scope thereof. The above-described embodiment illustrates a case where the cover unit  31  is provided with the mark (indication) of the switch; however, there is no limitation on the mark of the switch being provided on the cover unit  31  itself, and the position of the switch may be indicated by using other methods. 
     For example, according to a modification of the sensor module  30 , illustrated in  FIG. 19 , the sensor module  30  includes a backlight  87  between the sensor main body  32  and the cover unit  31  and an indication unit  88  between the backlight  87  and the cover unit  31  so that the mark of the switch may be indicated. 
     More specifically, the cover unit  31  is made of a light transmissive material and the indication of the indication unit  88  is projected onto the cover unit  31  by the backlight  87  so that the mark of the switch, or the like, may be indicated. As the indication unit  88 , it is possible to use a transparent plate, on which the mark of the switch is depicted, or a liquid crystal device that displays the mark of the switch. Furthermore, as the backlight  87 , it is possible to use the one that includes a light guide plate  85  and a light source  86  that emits light to the light guide plate  85  as used in liquid crystal devices, or the like. 
     In the case of this configuration, if the back surface  31   a  of the cover unit  31  at the side of the sensor main body  32  is provided with a half mirror (not illustrated), the mark of the switch may be indicated only when the backlight  87  is turned on. 
     Furthermore, if only part of the wallpaper, corresponding to the plain-face switch  10 , is optically transmissive to such a degree that when the backlight  87  is turned on, the mark of the switch emerges, it is possible to develop a design of the wall such that the presence of the plain-face switch  10  is not visible at the normal time. In this case, for example, in conjunction with a human sensor, or the like, the backlight  87  may be turned on so that the mark of the switch is indicated only when someone is approaching. 
     Furthermore, without the provision of the half mirror, the indication may be directly printed on the cover unit  31 , which is formed with a light transmissive material, so that the indication is lighted up by the backlight  87 . Especially at the night, or the like, the indication by only printing is hard to be visible; however, the above lighting-up allows the configuration to instantly know where the switch is located. Furthermore, the present embodiment describes the case where the mark of the switch is indicated; however, changes may be appropriately made as to what kind of mark is indicated, and there is no limitation on the mark of the switch. 
     Furthermore, in the case of the first embodiment, too, as illustrated in  FIG. 11A , the size of the opening  1   a  does not necessarily need to be larger than the outer shape of the sensor module  30 . A configuration may be such that the size of the opening  1   a  is substantially the same as the size of the sensor module  30  and a hole is provided on part of the outer wall  1 , corresponding to the thread  2   b . In this case, the packing  20  may conform to the shape of the hole on the outer wall  1 , provided corresponding to the thread  2   b.    
     Furthermore, the first embodiment and the second embodiment describe the configuration where the elastic members  70   a ,  70   b ,  70   c ,  70   d  are provided at the four corners of the back surface of the plane section  61  of the base unit  60 ; however, there is no limitation on this configuration. 
     For example, the configuration may be the modification that is illustrated in  FIG. 20  and  FIG. 21 .  FIG. 20  is a perspective view that illustrates a base unit  60 ′ according to the modification as viewed from the front side, the direction of the illustration is the same as that of the base unit  60  that is illustrated in  FIG. 2 , and  FIG. 21  is a perspective view as viewed from the back surface side in  FIG. 20 . In  FIG. 20  and  FIG. 21 , the same components as those in the first embodiment are attached with the same number with their explanations omitted, and only different points are principally explained. 
     As illustrated in  FIG. 20  and  FIG. 21 , according to the modification, an elastic member  70 ′ is only one elastic member that is provided between the base unit  60 ′ and the undepicted bottom surface (the inner wall  2 ). Furthermore, as illustrated in  FIG. 21 , the elastic member  70 ′ is provided such that it is located at the center of the plane section  61 . 
     Furthermore, the base unit  60 ′ is provided with protruding sections  72 ′ that abut the inner circumference of the elastic member  70 ′, arranged at substantially 90°. More specifically, the four protruding sections  72 ′, protruding from the plane section  61  toward the side of the undepicted bottom surface (the inner wall  2 ), are provided at two areas located away in the X direction and at two areas located away in the Y direction, and the four protruding sections  72 ′ are provided such that they are located at the positions with the same distance with reference (origin) to the center of the plane section  61 . 
     Furthermore, the distance between the protruding sections  72 ′ at two areas, located away in the X direction, is a distance that nearly equals the inner diameter of the elastic member  70 ′, which is a coil spring. The distance between the protruding sections  72 ′ at two areas, located away in the Y direction, is also a distance that nearly equals the inner diameter of the elastic member  70 ′. 
     Furthermore, the inner circumference of the elastic member  70 ′ abuts the four protruding sections  72 ′, and the elastic member  70 ′ is attached to the base unit  60 ′ such that the elastic member  70 ′ is engaged with the protruding section  72 ′; thus, in the same manner as described in the first embodiment, the elastic member  70 ′ is prevented from being separated from the base unit  60 ′ when the task of attaching the plain-face switch  10  is performed. 
     The length of the used elastic member  70 ′ is also longer than the lengths of the leg sections  63   a ,  63   b  of the base unit  60 ′ in a state where it is fully stretched without any loads being applied. Therefore, the base unit  60 ′ may be fixed in the state (floating state) where it is separated from the undepicted bottom surface (the inner wall  2 ) in the same manner as the base unit  60  according to the first embodiment, and by adjusting the screwing degree of the threads  2   b  (not illustrated), which are screwed into the undepicted bottom surface (the inner wall  2 ) through the thread holes  66   a ,  66   b ,  66   c , and  66   d , with respect to the bottom surface (the inner wall  2 ), the position and the tilt in the depth direction may be changed. 
     Thus, according to the modification that is illustrated in  FIG. 20  and  FIG. 21 , the same operation and function as those in the above-described embodiment may be achieved. Furthermore, if there is one elastic member as in the modification, it is preferable that a large elastic member is used to receive the base unit  60 ′ in a stable manner. 
     Thus, the present invention is not limited to specific embodiments, it includes various changes made, and it is obvious to a person skilled in the art from the description in claims. 
     According to the present invention, it is possible to provide a mounted-type plain-face switch that is attachable such that the sensor module is located at the opening and that may be easily provided such that the sensor module is flush with the opening or may be provided such that it is tilted with respect to the opening, and a method for attaching the plain-face switch. 
     Furthermore, as explained in detail in the embodiments, or the like, the detailed explanation of the invention also describes the invention related to a method for attaching a plain-face switch as noted below. 
     Note 1 
     A method for attaching a mounted-type plain-face switch that is attachable such that a sensor module is located at an opening, the method comprising: 
     securing a base unit to a bottom surface at back of the opening with a securing unit; 
     supporting the sensor module by the base unit such that a flat sensor surface faces side of the opening; and 
     adjusting a secured state of the base unit by the securing unit so as to adjust a position or a tilt of the sensor module in a depth direction with respect to the opening such that an edge surface of the sensor module at the side of the opening enters a predetermined state with respect to the opening. 
     Note 2 
     The attachment method according to note 1, wherein the predetermined state is a state where the edge surface of the sensor module at the side of the opening is flush with the opening. 
     Note 3 
     The attachment method according to note 1 or 2, wherein 
     the securing unit includes an elastic member, which is provided between the base unit and the bottom surface, and a securing member that secures the base unit to the bottom surface, and 
     the adjusting is adjusting a secured state of the securing member to obtain the predetermined state. 
     Note 4 
     The attachment method according to note 3, wherein 
     the base unit includes a rectangular plane section and leg sections that extend from at least two opposing sides of the plane section toward the bottom surface, 
     the elastic member is provided at least at four corners or a center of the plane section, 
     the securing member is provided at least on the leg section in neighborhood of the four corners of the plane section, and 
     the adjusting the secured state of the securing member is adjusting the secured state of each securing member to obtain the predetermined state. 
     Note 5 
     The attachment method according to note 3 or 4, wherein 
     the securing member is a thread, and 
     the adjusting the secured state of the securing member is adjusting a screwing degree of the thread with respect to the bottom surface. 
     Note 6 
     The attachment method according to note 3 or 4, wherein 
     the securing member includes a guide pin that is secured to the bottom surface and an adhesive agent that attaches the base unit to the guide pin, and 
     the adjusting the secured state of the securing member is conducted such that the adhesive agent becomes hardened while the edge surface of the sensor module at the side of the opening is retained at a predetermined state with respect to the opening. 
     Note 7 
     The attachment method according to any one of notes 1 to 6, wherein 
     the sensor module includes a sensor main body and a cover unit that is attached to the sensor main body at the side of the opening, and 
     the supporting includes
         attaching the sensor main body to a switch box; and   attaching the switch box to the base unit.