Switch device having self-cleaning function
AssigneeAlps Electric Co., Ltd.
InventorsJunji Tsuchiya, Koji Dono
Life of this patent
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Abstract
A switch device that prevents a contact failure from occurring between electrode contact points by having a self-cleaning function is provided. When a key top 4 is pushed downward, a portion between a winding start end 7b and a winding terminal end 7c of a spiral contactor 7 is extended by an operation part 3B provided in an actuator 3. At this time, the winding start end 7c slides along the surface of a stationary electrode 5. As a result, dusts or stains attached to the winding terminal end 7c and/or the stationary electrode 5, oxide films formed on the surfaces of the electrodes, etc., is self-cleaned. Therefore, it is possible to solve a contact failure problem between the movable electrode 6 and the stationary electrode 5.
Claims4
A switch device having a movable electrode, a counter electrode provided to face the movable electrode, and an operating member that pushes at least the movable electrode to bring the movable electrode into contact with the counter electrode,
- wherein the movable electrode comprises an elastic deformation part that is extensibly deformed in a direction approaching the counter electrode and a sliding contact point that slides along the surface of the counter electrode when contacting the counter electrode,
- wherein the movable electrode is formed as a spiral contactor spirally formed from its winding start end on the outer circumference side towards its winding terminal end on the center side, and the winding terminal end is formed as the sliding contact point, and
- wherein the spiral contactor is supported in a cantilever manner.
Dependencies are inferred from the claim text.