Title:
ROTARY INPUT DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/152504
Kind Code:
A1
Abstract:
The present invention provides a rotary input device capable of determining a rotation direction by accurately detecting a change in capacitance even when a signal component representing the change in capacitance is close to an offset component variation. A detection signal generating unit 110 generates a detection signal according to the sum of charges stored in a first variable capacitor VC1 and a second variable capacitor VC2 due to a pulse voltage supply. In addition, when a three-step rotation is performed in an operation unit 10, a detection signal is generated which has a median value between a detection signal at a stop location of the first variable capacitor VC1 and a detection signal at a stop location of the second variable capacitor VC2, in a stop location of a third step in which there is not a variable capacitor. A signal processing unit 120 determines the rotation direction of the operation unit 10 on the basis of a detection signal change corresponding to a change in the capacitance of a variable capacitor VC.
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Inventors:
TABATA MASASHI (JP)
HIGUCHI SHINICHI (JP)
HIGUCHI SHINICHI (JP)
Application Number:
PCT/JP2016/057172
Publication Date:
September 29, 2016
Filing Date:
March 08, 2016
Export Citation:
Assignee:
ALPS ELECTRIC CO LTD (JP)
International Classes:
G01D5/244; G01P13/04; G06F3/0362
Foreign References:
| JP2014235019A | 2014-12-15 | |||
| JP2013030121A | 2013-02-07 | |||
| JP2001296966A | 2001-10-26 | |||
| JP2001517314A | 2001-10-02 | |||
| JPH08334378A | 1996-12-17 | |||
| JPH0224512A | 1990-01-26 | |||
| JPS62239019A | 1987-10-19 |
Attorney, Agent or Firm:
MATSUSHITA, MASAHIRO (JP)
Matsushita Masahiro (JP)
Matsushita Masahiro (JP)
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