To solve a problem that in a conventional smart entry system of this kind, whenever a passerby or the like touches a door handle, an electric wave is transmitted to an entry key and power consumption increases to cause a battery dead.
At least two or more sensor electrodes (2A, 2B) formed by conductive member are installed in the door handle or in the vicinity of door handle, and a conversion circuit to convert capacity change of the respective sensor electrodes caused by approach of an object into a parameter of voltage or capacity and a judgement circuit to detect the parameter of voltage or capacity converted are installed. The electrostatic capacity type touch sensor for door generates a detection output by a logical product of the output by these two or more sensor electrodes, thereby, operation which is caused by the touch other than by the user is made few.
SUGIMURA KAZUHIKO
HIROSE YOICHI
