Patent ID: 8766824

Claim:
An electronic apparatus for detecting an input operation using a plurality of contact points, the electronic apparatus comprising: an input key unit; a detection-circuit control unit; and a detection circuit, wherein the detection circuit includes a plurality of contact points, the contact points include at least a first contact point capable of changing between a connected state in which a first signal line and a second signal line are electrically connected, and an open state in which the first signal line and the second signal line are not electrically connected, a second contact point capable of changing between a connected state in which the first signal line and the second signal line are electrically connected and the second signal line and a third signal line are electrically connected, and an open state in which the first signal line and the second signal line are not electrically connected and the second signal line and the third signal line are not electrically connected, and a third contact point capable of changing between a connected state in which the second signal line and the third signal line are electrically connected, and an open state in which the second signal line and the third signal line are not electrically connected, and a rectifier preventing a short circuit between the first signal line and the third signal line when the second contact point is changed to the connected state, wherein the input key unit changes states of the plurality of contact points based on an accepted input operation, and the detection-circuit control unit obtains a detection signal corresponding to changed states of the plurality of contact points from the detection circuit, and detects the input operation from the obtained detection signal.