Patent ID: 9346436
Filing Date: 2016-05-24
CPC Classification: B60R

Claim Text:
1. An electronic key system comprising: a transmission part configured to wirelessly transmit a polling signal at predetermined time intervals into a predetermined transmission area outside a vehicle interior; a detection part configured to detect an electronic key by receiving a response signal transmitted from the electronic key that is in the transmission area in response to the polling signal; an authentication part configured to carry out collation between the detected electronic key and an ID code; and an execution part configured to, when the electronic key is detected by the detection part, cause a predetermined function of an on-vehicle apparatus to be executed if the electronic key is authenticated by the authentication part, wherein the transmission part is configured to transmit the polling signal into an enlarged transmission area which is enlarged from the predetermined transmission area when a state where the electronic key is detected by the detection part and a state where the electronic key is not detected by the detection part are repeated a predetermined number of times or more within a predetermined time, and when the electronic key is detected from the enlarged transmission area by the detection part, the execution part is configured not to cause the predetermined function to be executed even if the electronic key is authenticated by the authentication part.