Invention Grant
- Patent Title: Capacitive proximity sensor and door handle device comprising the capacitive proximity sensor
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Application No.: US15473950Application Date: 2017-03-30
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Publication No.: US10309131B2Publication Date: 2019-06-04
- Inventor: Mamoru Kubo
- Applicant: Tokyo Parts Industrial Co., Ltd.
- Applicant Address: JP
- Assignee: Tokyo Parts Industrial Co., Ltd.
- Current Assignee: Tokyo Parts Industrial Co., Ltd.
- Current Assignee Address: JP
- Agency: Jordan and Koda, PLLC
- Priority: JP2016-113249 20160607
- Main IPC: G01R27/26
- IPC: G01R27/26 ; E05B85/10 ; G01D5/24 ; H03K17/955
Abstract:
The resonance frequency of an LCR resonance circuit is f1 and the determination voltage signal is V1, when an object is not in the proximity of a sensor electrode. The resonance frequency of the LCR resonance circuit is f2 and the determination voltage signal is V2, when a human body is in proximity of the sensor electrode 22. The resonance frequency of the LCR resonance circuit is f3 and the determination voltage signal is V3, when water is in the proximity of the sensor electrode. The LCR resonance circuit has the relationship f1>f2>f3. A control unit controls a high-frequency signal S0 so as to satisfy the relationship V2>V1>V3, and a human body or water being in the proximity of the sensor electrode is distinguished.
Public/Granted literature
- US20170350169A1 CAPACITIVE PROXIMITY SENSOR AND DOOR HANDLE DEVICE COMPRISING THE CAPACITIVE PROXIMITY SENSOR Public/Granted day:2017-12-07
Information query
