Patent attributes
An electronic key system has a portable apparatus, an operation control device and an update control device. The portable apparatus selectively transmits a first signal and a second signal. The operation control device authorizes an operation of a key based on reception of the first signal. The update control device transmits an update signal in a private region of the owner of the portable apparatus. The portable apparatus has a counter and a portable apparatus controller. When receiving the update signal, the portable apparatus controller resets the counter. When the counting value of the counter is equal to or less than a predetermined limit value, the controller selects the first signal as a signal to be transmitted. When the counting value is in excess of the limit value, the controller selects the second signal as a signal to be transmitted.
