Antenna device and door handle device
AssigneeAisin Seiki Kabushiki Kaisha
InventorsHisashi Inaba, Kiyokazu Ieda, Rikuo Hatano
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Abstract
A transmission/reception antenna (21) comprises a core (31) and a coil (32) wound around the core (31). One of a plurality of core sheets (31a) constituting the core (31) is utilized as a sensor electrode (23). Conductors (33, 34) extending from the two ends of the coil (32) are connected to a transmission/reception drive circuit (22). The conductor (35) extending from a capacitance detector (24) is connected to one of the conductors (33, 34) extending between the coil (32) and the transmission/reception drive circuit (22). Consequently, the capacitance detector (24) is alternately connected to the sensor electrode (23) through a parasitic capacitance C1 generated between the coil (32) and the sensor electrode (23) (core sheet (31a)).
Claims11
An antenna device comprising:
- an antenna including a core made of a conductive alloy and a coil wound around the core;
- a sensor electrode formed by at least part of the core, the coil being wound around the sensor electrode;
- and
- a capacitance detector, electrically connected to the coil, for detecting a capacitance change at the sensor electrode.
A door handle device for a vehicle door, the door handle device comprising:
- an antenna including a core made of a conductive alloy and a coil wound around the core;
- a sensor electrode formed by at least part of the core, the coil being wound around the sensor electrode;
- and
- a capacitance detector, electrically connected to the coil, for detecting a capacitance change at the sensor electrode;
- and
- a handle arrangeable outside the vehicle door;
- wherein the antenna is accommodated in the handle.
Dependencies are inferred from the claim text.