Patent ID: 8927848
Filing Date: 2015-01-06
Classification: G10H

Abstract:
1. A keyboard circuit comprising: contact units that are provided so as to correspond to a plurality of keys, respectively, the contact units having ON/OFF states that change in response to a key-pressing/key-releasing operation to the plurality of keys; elements that are provided for each of the plurality of contact units, wherein each of the elements has at least three input/output terminals and the contact units are connected to any one of the input/output terminals; and a wiring unit that outputs signals indicating the ON/OFF states of the respective contact units by supplying a switch signal to a remaining one of the input/output terminals of the respective elements, supplying a control signal to another remaining one of the input/output terminals, and supplying to the contact units the switch signal supplied in a time-division manner by way of the control signal.