Patent ID: 8482303
Filing Date: 2013-07-09
Classification: E05B,G01R,H03K,H05K

Abstract:
1. A sensor electronics in a door handle of a vehicle, comprising: a capacitive sensor for detecting the approach of an object to the door handle, the capacitive sensor comprising: a sensor electrode and a shield electrode disposed between the sensor electrode and a ground metallization plane having a ground potential, the shield electrode connected to a shield electrode control circuit that tracks the potential of the shield electrode with the potential of the sensor electrode; a sensor control circuit coupled to the sensor electrode for evaluation of and forwarding sensor output signals, the sensor control circuit having components; and a circuit board being arranged in an internal space of the door handle, the components of the sensor control circuit being mounted on an upper side of the circuit board, the circuit board having at least four metallization planes insulated from each other by insulating layers, the metallization planes comprising: a first metallization plane on the upper side including wiring connections between the components of the sensor control circuit, a second metallization plane comprising the ground-metallization plane, a third metallization plane including the shield electrode, and a fourth metallization plane including the sensor electrode; wherein the wiring connections between the components of the sensor control circuit are arranged on one side of the ground-metallization plane and the shield electrode and the sensor electrode are arranged on the other side of the ground-metallization plane.