Title:
CAPACITANCE DETECTION DEVICE AND INPUT DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/116706
Kind Code:
A1
Abstract:
This capacitance detection device 2 has a first voltage output circuit 21 for outputting a first AC voltage V1 supplied to a shield electrode Ea disposed in the vicinity of a detection electrode Es, a second voltage output circuit 22 for outputting a second AC voltage V2 that has the same frequency and phase as the first AC voltage V1 and a smaller amplitude than the first AC voltage V1, and a current output circuit 23 for outputting a drive current Is to the detection electrode Es so as to reduce the voltage difference between the voltage of the detection electrode Es and the second AC voltage V2 and outputting a detection signal Vo corresponding to the drive current Is. The second voltage output circuit 22 outputs a second AC voltage V2 having an amplitude that is adjusted such that the drive current Is is zero in a state where there is no object 6 near the detection electrode Es.
Inventors:
SASAI KIYOSHI (JP)
FUJIYOSHI TATSUMI (JP)
SAGAWAI SHINICHI (JP)
FUJIYOSHI TATSUMI (JP)
SAGAWAI SHINICHI (JP)
Application Number:
PCT/JP2017/041125
Publication Date:
June 28, 2018
Filing Date:
November 15, 2017
Export Citation:
Assignee:
ALPS ELECTRIC CO LTD (JP)
International Classes:
G01R27/26; G06F3/041; G06F3/044; H03K17/955
Domestic Patent References:
| WO2016059967A1 | 2016-04-21 |
Foreign References:
| JP2000234939A | 2000-08-29 | |||
| JP2015125088A | 2015-07-06 | |||
| JP2011242370A | 2011-12-01 | |||
| US9151792B1 | 2015-10-06 |
Other References:
See also references of EP 3561527A4
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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