Title:
PROXIMITY SENSOR
Document Type and Number:
WIPO Patent Application WO/2015/041121
Kind Code:
A1
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.
Inventors:
SATO YASUSHI (JP)
Application Number:
PCT/JP2014/073990
Publication Date:
March 26, 2015
Filing Date:
September 10, 2014
Export Citation:
Assignee:
KYUSHU INST TECHNOLOGY (JP)
International Classes:
H03K17/95; G01V3/12
Foreign References:
| JP2003315295A | 2003-11-06 | |||
| JPH1117515A | 1999-01-22 |
Attorney, Agent or Firm:
Shin-yu International Patent Firm (JP)
Patent business corporation Nobutomo international patent firm (JP)
Patent business corporation Nobutomo international patent firm (JP)
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