VIBRATION SENSOR AND EXTERNAL ENVIRONMENT DETECTION DEVICE

Title:

VIBRATION SENSOR AND EXTERNAL ENVIRONMENT DETECTION DEVICE

Document Type and Number:

WIPO Patent Application WO/2013/105298

Kind Code:

A1

Abstract:

With the relative positional change between a first substrate and a second substrate due to an external vibration, the positional relationship between an electret group and an electrode group changes, as a result of which a vibration sensor outputs the detection signal of the external vibration. The electrode group is divided into two or more predetermined number of phases, and small electrode groups are formed that can generate electric signals in response to the external vibration on a per-phase basis. In the electrode group, a phase difference generation gap that generates predetermined phase differences between the respective electrical signals generated in the small electrode groups is provided between adjacent electrodes included in the electrode group, according to the predetermined number of phases. The vibration sensor outputs, as the detection signal of the external vibration, a signal formed by superimposing the electric signals generated in the small electrode groups as a result of the relative positional change between the first substrate and the second substrate due to the external vibration. This provides a highly simple and convenient vibration sensor for detecting an external vibration by use of electrets.

Inventors:

MASAKI TATSUAKIRA (JP)
YOKOYAMA TORU (JP)
MATSUURA KEIKI (JP)

Application Number:

PCT/JP2012/070829

Publication Date:

July 18, 2013

Filing Date:

August 16, 2012

Export Citation:

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Assignee:

OMRON TATEISI ELECTRONICS CO (JP)
MASAKI TATSUAKIRA (JP)
YOKOYAMA TORU (JP)
MATSUURA KEIKI (JP)

International Classes:

G01H11/06; H04R11/04

Domestic Patent References:

WO2009123022A1

2009-10-08

Foreign References:

JP2011221002A	2011-11-04
JP2010081724A	2010-04-08
JP2009284240A	2009-12-03

Other References: