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US 2016/0238732 A1Published application
Proximity sensor
AssigneeKyushu Institute of Technology
InventorYasushi SATO
Life of this patent
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Abstract
A first oscillation circuit in which a helical antenna is used as a part of an element for a resonance circuit and a second oscillation circuit in which a loop antenna is used as a part of an element for a resonance circuit are caused to oscillate at substantially the same frequency. When a human body approaches the helical antenna and the loop antenna, the frequency difference between the first oscillation circuit and the second oscillation circuit increases. This frequency difference is extracted using a BPF.
Claims9
A proximity sensor comprising:
- a first oscillation circuit that uses a first antenna having an open end as a part of an element for a resonance circuit;
- a second oscillation circuit that uses a second antenna having both ends connected to a circuit as a part of an element for a resonance circuit;
- and
- a proximity detection unit that detects a proximity state of an arbitrary detection target based on the frequency difference between a first output signal output from the first oscillation circuit and a second output signal output from the second oscillation circuit.
1 more element
Dependencies are inferred from the claim text.