| 摘要 |
This is an electrical switch mechanism actuated by a piano-style key of a musical instrument. The switch consists of a pair of cross-bar contacts, at least one of which is resiliently flexible. This resilience permits a moveable contact member to be driven into engagement with a fixed contact member, and also keeps it firmly biased against the fixed contact member for electrical communication therewith whenever the key is in its actuated position. When the key is released, an actuator member on the key captures the moveable contact and moves it away from the fixed contact. Upon actuation, the key over-travels beyond the point of contact engagement, but the actuator decouples from the contact so as to avoid any increase in contact pressure and prevent double-keying. Various techniques for minimizing impact noise during contact recapture, and for mounting the contacts upon a circuit board, are also disclosed.
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