Patent ID: 6849796

Claim:
An operation detection switch comprising: a switch main body disposed between an operating portion of a musical instrument and the surface of a circuit board having a first and a second fixed contacts formed thereon; a first and a second extending portions extending, respectively, from the switch main body and provided at the tips with movable contacts corresponding to the first and the second fixed contacts, when the operating portion is depressed, the switch main body is directly or indirectly pressed by the operating portion and pivots around one end of the switch main body as the first fulcrum point, whereby the movable contact of the first extending portion abuts the first fixed contact, then the movable contact of the second extending portion abuts the second fixed contact, the switch main body being provided with a protrusion protruding toward the surface of the circuit board from between the first and the second extending portions, and wherein as the operating portion is further depressed after the movable contacts of the first and the second extending portions abut the first and the second fixed contacts in sequence, the switch main body pivots around the protrusion as a second fulcrum point with the movable contact of the second extending portion abutting the second fixed contact and the second extending portion being elastically deformed, thereby the movable contact of the first extending portion detaching from the first fixed contact.