Push switch

Abstract

A push switch which can have a small separation distance from a side surface of a mounting board, when it is mounted on the mounting board through a step, is disclosed. The push switch includes a substrate having a first surface on which a first fixed contact point and a second fixed contact point surrounding the first fixed contact point are formed, a second surface located opposite to the first surface, a third surface extending from the second surface to a corner in a direction perpendicular to the first surface, and a fourth surface extending from the corner parallel to the first surface, and a conductive movable contact point having a peripheral edge is in contact with the second fixed contact point, and a center contacted by the first fixed contact point when the movable contact point is pressed, and the corner includes a groove recessed with respect to at least one of the third surface and the fourth surface.

What is claimed is: 
     
         1 . A push switch which is mountable on a mounting board, comprising:
 a substrate comprising a first surface on which a first fixed contact point and a second fixed contact point surrounding the first fixed contact point are formed, a second surface located opposite to the first surface, a third surface extending from the second surface to a corner in a direction perpendicular to the first surface, and a fourth surface extending from the corner parallel to the first surface;   a conductive movable contact point placed so that a peripheral edge of the movable contact point is in contact with the second fixed contact point, and a center of the movable contact point comes into contact with the first fixed contact point when the movable contact point is pressed; and   a metal member formed in a region spaced apart from a line of intersection between the third surface and the fourth surface by not less than a predetermined distance and protruding from one of the third surface and the fourth surface,   wherein the metal member is arranged so as to touch with the mounting board when the push switch is mounted on a mounting board.   
     
     
         2 . The push switch according to  claim 1 , wherein the corner has a groove recessed with respect to at least one of the third surface and the fourth surface. 
     
     
         3 . The push switch according to  claim 1 , wherein the space formed between the metal member and one of the third surface and the fourth surface constitutes a groove recess. 
     
     
         4 . The push switch according to  claim 1 , wherein the forth surface is arranged so as to touch with the mourning board when the push switch is mounted on the mounting board. 
     
     
         5 . A push switch which is mountable on a mounting board, comprising:
 a substrate comprising a first surface on which a first fixed contact point and a second fixed contact point surrounding the first fixed contact point are formed, a second surface located opposite to the first surface, a third surface extending from the second surface to a corner in a direction perpendicular to the first surface, and a fourth surface extending from the corner parallel to the first surface;   a conductive movable contact point, placed so that a peripheral edge of the movable contact point is in contact with the second fixed contact point, and a center of the movable contact point comes into contact with the first fixed contact point when the movable contact point is pressed; and   a frame in contact with the substrate on the second surface of the substrate,   wherein the frame has a side surface protrusion protruding from at least one of the third surface and the fourth surface, on a side surface perpendicular to the second surface and the third surface.   
     
     
         6 . The push switch according to  claim 5 , wherein the side surface protrusion protruding is arranged so as to touch with the mounting board when the push switch is mounted on the mounting board. 
     
     
         7 . The push switch according to  claim 5 , wherein the frame has a side surface positioning portion which is adapted to engage with the mounting board. 
     
     
         8 . The push switch according to  claim 5 , wherein the corner has a groove recessed with respect to at least OM of the third surface and the fourth surface. 
     
     
         9 . A push switch mountable on a mounting board, the switch comprising:
 a substrate comprising a first surface on which a first fixed contact point and a second fixed contact point surrounding the first fixed contact point are formed, a second surface located opposite to the first surface, a third surface extending from the second surface to a corner in a direction perpendicular to the first surface, and a fourth surface extending from the corner parallel to the first surface;   a conductive movable contact point placed so that a peripheral edge of the movable contact point is in contact with the second fixed contact point, and a center of the movable contact point comes into contact with the first fixed contact point when the movable contact point is pressed; and   an engagement projection formed on one of the third surface and the fourth surface and engageable with an engagement recess formed in the mounting board.   
     
     
         10 . The push switch according to  claim 9 , wherein a height of the engagement projection formed on the fourth surface from the fourth surface is greater than a depth of the engagement recess formed in the mounting board. 
     
     
         11 . The push switch according to  claim 9 , wherein the engagement projection formed on the third surface is located at a position having a distance from the fourth surface larger than a distance front an end mounted with the push switch on the mounting board to the engagement recess. 
     
     
         12 . The push switch according to  claim 9 , wherein the third surface is arranged so as to touch with the mounting board when the push switch is mounted on the mounting board.