| 摘要 |
PURPOSE: To provide high contact reliability and to improve operation feeling in an operation, by providing a fixed contact and a dome-like movable contact disposed on the fixed contact, and forming a protrusion contactable/separatable from the fixed contact in a part other than a dome-like top on the inner surface side of the movable contact. CONSTITUTION: A plurality of protrusions 5c are on an annular line in a part other than a dome-like top 5a on the inner surface side of the movable contact 5. When a stem 6 is pressed down, these protrusions 5c come into contact with a fixed contact 3, and therefore, the fixed contact 3 comes into contact with a movable contact 5 in a place without dust having tendency to accumulate at a central part 3a of the fixed contact 3. Therefore, this is stable in contact comparing with a structure where a top 5a directly comes into contact with the central part 3a of the fixed contact 3, and contact reliability is improved. Because the dome-like top 5a positioned inside the protrusion 5c also becomes movable during inversion, operation feeling during an operation does not exert bad effect.
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