CAPACITANCE TYPE DETECTION DEVICE, SENSOR UNIT, AND CONTROL SYSTEM FOR DETECTING APPROACH OF OBJECT, AND METHOD FOR SAME

Title:

CAPACITANCE TYPE DETECTION DEVICE, SENSOR UNIT, AND CONTROL SYSTEM FOR DETECTING APPROACH OF OBJECT, AND METHOD FOR SAME

Document Type and Number:

WIPO Patent Application WO/2011/024559

Kind Code:

A1

Abstract:

Disclosed are a device and a method for accurately detecting an approach of an object to be detected. Specifically, a measurement unit (210) measures the stray capacitances of first and second sensor electrodes (120, 133), and a determining unit (220) calculates average rates of change of the measured stray capacitances with respect to time during a period having a predetermined time length on the basis of the measured stray capacitances. Subsequently, the determining unit (220) determines whether or not an approach detection condition is satisfied, the condition including a predetermined relationship between the magnitude of a predetermined rate of change with respect to time determined in accordance with a combination of the object to be detected and another object that should be discriminated from the object to be detected and the magnitude of the calculated average rates of change with respect to time. The determining unit (220) determines that the object to be detected has approached when the approach detection condition is satisfied.

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Inventors:

MIURA YOSHINORI (JP)
MORIYA HITOSHI (JP)
ROKUKA TAKANOBU (JP)

Application Number:

PCT/JP2010/061389

Publication Date:

March 03, 2011

Filing Date:

July 05, 2010

Export Citation:

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Assignee:

SUMIDA CORP (JP)
MIURA YOSHINORI (JP)
MORIYA HITOSHI (JP)
ROKUKA TAKANOBU (JP)

International Classes:

B60J5/00; G01V3/08

Foreign References:

JP2002039708A	2002-02-06
JPH1184019A	1999-03-26
JP2007163175A	2007-06-28
JP2009133777A	2009-06-18

Other References: