Title:
CAPACITANCE DETECTION DEVICE, CAPACITANCE DETECTION METHOD, AND INPUT DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/168425
Kind Code:
A1
Abstract:
A calculation unit (25) calculates a detected value of capacitance of a capacitor (Crg) on the basis of a detection signal (Dm). A correction unit (26) repeatedly transitions to a correction mode, and if transitioned to the correction mode, the correction unit (26) controls an AC voltage output unit (20) such that a difference in amplitudes between a first AC voltage (V1) and a second AC voltage (V2) changes, and acquires a correction value according to a change in the detected value of the calculation unit (25) in association with the change in the difference in amplitudes. The correction unit (26) corrects the detected value calculated by the calculation unit (25), according to the change in the correction value acquired in the correction mode.
Inventors:
SASAI KIYOSHI (JP)
IIKURA AKIHISA (JP)
IIKURA AKIHISA (JP)
Application Number:
PCT/JP2021/044856
Publication Date:
August 11, 2022
Filing Date:
December 07, 2021
Export Citation:
Assignee:
ALPS ALPINE CO LTD (JP)
International Classes:
G01R27/26; G01R35/00; H03K17/955
Domestic Patent References:
| WO2018116706A1 | 2018-06-28 | |||
| WO2012043443A1 | 2012-04-05 |
Foreign References:
| US9151792B1 | 2015-10-06 |
Attorney, Agent or Firm:
MATSUSHITA Masahiro (JP)
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