PROXIMITY SENSING DEVICE AND INPUT-AIDING DEVICE USING SAME

WIPO Patent Application WO/2010/053013

A1

Provided are a capacitive proximity sensing device with high detection precision and an input-aiding device using the proximity sensing device. The sensor unit (1) is configured from a driving electrode (3) that applies a driving voltage and sensing electrodes (4) and (5) that are disposed to form different capacitances with the driving electrode (3). The output signal of the sensing electrode (4) is input to an amplifying circuit (6) and the amplified output signal is input to the positive terminal of a differential amplifying circuit (8) that has a positive terminal and negative terminal. The output signal of the sensing electrode (5) is input to an amplifying circuit (9) and the amplified output signal is input to the negative terminal of the differential amplifying circuit (8). The output signal amplified in the differential amplifying circuit (8) is filtered and digitized in an analog processing circuit (7) and input to a microcomputer (10). The difference value of the output signal is sensed in the microcomputer (10), and by comparing the sensed difference value and an established threshold value, the proximity of the sensed body is sensed.

FUJIYOSHI TATSUMI (JP)
TAKAI DAISUKE (JP)
KOIKE HIROSHI (JP)
HIROBE KISEI (JP)
HATANO NAOYUKI (JP)

PCT/JP2009/068236

May 14, 2010

October 23, 2009

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ALPS ELECTRIC CO LTD (JP)
FUJIYOSHI TATSUMI (JP)
TAKAI DAISUKE (JP)
KOIKE HIROSHI (JP)
HIROBE KISEI (JP)
HATANO NAOYUKI (JP)

G01V3/08; H01H36/00; H03K17/955

JP2000048694A	2000-02-18
JPH0429887U	1992-03-10
JP2006220492A	2006-08-24
JP2007116684A	2007-05-10
JP2006120571A	2006-05-11
JP2001507882A	2001-06-12

AOKI, Hiroyoshi et al. (JP)
Hiroyoshi Aoki (JP)

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