PHYSICAL QUANTITY MEASURING DEVICE

Title:

PHYSICAL QUANTITY MEASURING DEVICE

Document Type and Number:

WIPO Patent Application WO/2005/068938

Kind Code:

A1

Abstract:

A physical quantity measuring device. It uses a vibrator (1), a self-oscillating circuit (12A) for exciting drive oscillation of the vibrator (1), and a detecting circuit for outputting an output signal from the vibrator (1) to measure a physical quantity according to the output signal. The self-oscillating circuit (12A) has a current/voltage converter (3) and a low-pass filter (25). The detecting circuit has a charge-amplifying circuit for amplifying the output signal from the vibrator. At least the current/voltage converter and the charge-amplifying circuit are fabricated into a monolithic IC.

Inventors:

YOKOI SHOJI (JP)
KOBAYASHI YOSHIHIRO (JP)
TAKAHASHI MASAYUKI (JP)

Application Number:

PCT/JP2005/000936

Publication Date:

July 28, 2005

Filing Date:

January 19, 2005

Export Citation:

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Assignee:

NGK INSULATORS LTD (JP)
SEIKO EPSON CORP (JP)
NIPPON PRECISION CIRCUITS (JP)
YOKOI SHOJI (JP)
KOBAYASHI YOSHIHIRO (JP)
TAKAHASHI MASAYUKI (JP)

International Classes:

G01C19/56; G01C19/5614; G01C19/5776; G01P15/08; (IPC1-7): G01C19/56

Foreign References:

JP2002174521A	2002-06-21
JP2000002543A	2000-01-07
JPH07270165A	1995-10-20
JPH1126777A	1999-01-29
JPH0984789A	1997-03-31

Other References: