| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the number of switches provided for a casing, to miniaturize a device and to improve operability by providing an elastic support body and a detection part for detecting the push-down of a ball and obtaining a detection signal from the detection part when the ball is pushed in. SOLUTION: Respective rollers 8 and 9 are brought into contact with the outer face 3a of the base side of the ball 3. Respective elastic supporting bodies 12 always energize the ball 3 upward. When the ball 3 is pushed down as shown by a dotted line from a solid line, the respective elastic supporting bodies 12 are pushed down. When pushing down force is removed, it returns to a position shown by the solid line. A detection part 15 which is constituted of a push key switch, a limit switch and a magnetic switch and shows the function of a former primary switch is provided for an almost central position on the inner face of the base part 4 of the casing 1. The detection part 15 operates and the detection signal can be obtained when the ball 3 is pushed down and it reaches the position shown by the dotted line.</p> |
