An angular velocity detector circuit composed of: an oscillator circuit including an inverting amplifier connected between a driving electrode of a quartz crystal and an electrode for detecting an electric field generated in the quartz crystal by a Corioli's force when the quartz crystal is rotated; a differential amplifier circuit connected at its input terminals to the detecting electrode of the quartz crystal; a detector circuit which receives the output from the differential amplifier circuit and using the output from the oscillator circuit as detection signals; and an output amplifier circuit which receives the output from the detector circuit. |
Citations|
| US4674331 | Nov 5, 1986 | Jun 23, 1987 | Watson Industries Inc. | Angular rate sensor | | US4930351 | Mar 24, 1988 | Jun 5, 1990 | WJM Corporation | Vibratory linear acceleration and angular rate sensing system | | US5270607 | Jun 6, 1992 | Dec 14, 1993 | Akai Electric Co., Ltd. | Vibration control apparatus | | US5293779 | Dec 5, 1991 | Mar 15, 1994 | Murata Manufacturing Co., Ltd. | Detecting circuit for detecting an abnormal state in a vibrating gyroscope | | US5349857 | Apr 12, 1993 | Sep 27, 1994 | Murata Manufacturing Co., Ltd. | Vibratory gyroscope |
Referenced by|
| US5719460 | Nov 28, 1995 | Feb 17, 1998 | Nippondenso Co., Ltd | Angular velocity sensor | | US5757107 | Feb 7, 1997 | May 26, 1998 | Fujitsu Limited | Tuning-fork vibratory gyro and sensor system using the same | | US5847279 | Jun 26, 1996 | Dec 8, 1998 | Asulab S.A. | Angular speed measuring device | | US5861705 | Apr 4, 1996 | Jan 19, 1999 | Fujitsu Limited | Tuning-fork vibratory gyro and sensor system using the same | | US5939631 | Mar 13, 1998 | Aug 17, 1999 | BEI Technologies Inc. | Low impedance single-ended tuning fork and method | | US5942839 | Aug 30, 1996 | Aug 24, 1999 | Alps Electric Co., Ltd. | Piezoelectric vibrator and vibratory gyroscope using the same | | US5962953 | Jul 29, 1997 | Oct 5, 1999 | NEC Corporation | Piezoelectric transformer with monitor electrodes for sensing unbalanced vibration of the transformer | | US5970793 | Jul 7, 1997 | Oct 26, 1999 | Citizen Watch Co., Ltd. | Angular velocity sensor and angular velocity sensing system | | US6049157 | Jan 9, 1998 | Apr 11, 2000 | Sony Corporation | Angular velocity sensor | | US6170330 | May 20, 1999 | Jan 9, 2001 | Citizen Watch Co., Ltd. | Angular velocity sensor and angular velocity sensing system | | US6177756 | Dec 30, 1998 | Jan 23, 2001 | Fujitsu Limited | Piezoelectric gyro and method of driving the piezoelectric gyro | | US6281619 | May 8, 1998 | Aug 28, 2001 | Citizen Watch Co., Ltd. | Vibration gyro | | US6327908 | Oct 7, 1999 | Dec 11, 2001 | Fujitsu Limited
Fujitsu Towa Electron Limited | Tuning fork type vibration gyro | | US6532817 | Apr 27, 1999 | Mar 18, 2003 | Matsushita Electric Industrial Co., Ltd. | Angular velocity sensor and process for manufacturing the same | | US6588274 | Oct 26, 2000 | Jul 8, 2003 | Murata Manufacturing Co., Ltd. | Self-diagnosing circuit for vibrating gyroscope | | US6931927 | Jul 24, 2003 | Aug 23, 2005 | Fujitsu Media Devices Limited | Tuning fork vibration gyro | | US7138288 | Mar 25, 2004 | Nov 21, 2006 | Citizen Watch Co., Ltd. | Method for manufacturing small crystal resonator | | US7348716 | Dec 6, 2005 | Mar 25, 2008 | Seiko Epson Corporation | Piezoelectric gyro element and piezoelectric gyroscope | | US8065914 | Jun 30, 2008 | Nov 29, 2011 | Seiko Epson Corporation | Vibration gyro |
Claims1. An angular velocity detector circuit comprising: - a quartz crystal oscillator which is provided with a first electrode for driving the oscillator and a second electrode installed perpendicularly to the first electrode for taking out an electric field generated by rotation of the oscillator;
- an oscillator circuit having an inverting amplifier with an input terminal connected to the first electrode and an output terminal connected to the second electrode of the quartz crystal oscillator; a differential amplifier circuit with an input terminal connected to the second electrode of the quartz crystal oscillator;
- a detector circuit which receives an output from the differential amplifier circuit and using an output from the oscillator circuit as detection signals; and an output amplifier circuit which receives an output from the detector circuit.
2. An angular velocity detector circuit comprising: - a quartz crystal oscillator which is provided with a first electrode installed on two parallel planes of the oscillator for driving the oscillator and a second electrode installed perpendicularly to the first electrode for taking out an electric field generated by rotation of the oscillator;
- an oscillator circuit having an inverting amplifier with an input terminal connected to a portion of the first electrode and an output terminal connected to another portion of the first electrode of the quartz crystal oscillator;
- a differential amplifier circuit with an input terminal connected to the second electrode of the quartz crystal oscillator;
- a detector circuit which receives an output from the differential amplifier circuit and using an output from the oscillator circuit as detection signals; and
- an output amplifier circuit which receives an output from the detector circuit.
3. An angular velocity detector circuit comprising: - a quartz crystal oscillator which is provided with a first electrode and a second electrode installed perpendicularly to the first electrode for driving the oscillator, and a third electrode installed on the same plane of the oscillator as a part of the second electrode for taking out an electric field generated by rotation of the oscillator;
- an oscillator circuit having an inverting amplifier with an input terminal connected to the first electrode and an output terminal connected to the second electrode of the quartz crystal oscillator; a differential amplifier circuit with an input terminal connected to the third electrode of the quartz crystal oscillator;
- a detector circuit which receives an output from the differential amplifier circuit and using an output from the oscillator circuit as detection signals; and
- an output amplifier circuit which receives an output from the detector circuit.
4. An angular velocity detector circuit comprising: - a quartz crystal oscillator which is provided with a first electrode and a second electrode installed perpendicularly to the first electrode for driving the oscillator;
- a third electrode connected to the second electrode, a fourth electrode installed on the opposite plane of the third electrode, a fifth electrode installed on the same plane of as the third electrode, and a sixth electrode installed on the same plane of as the fourth electrode, for taking out an electric field generated by rotation of the oscillator; an oscillator circuit having an inverting amplifier with an input terminal connected to the first electrode and an output terminal connected to the second electrode of the quartz crystal oscillator; a differential amplifier circuit having input terminal connected to the fifth and sixth electrodes of the quartz crystal oscillator;
- a detector circuit which receives an output from the differential amplifier circuit and using an output from the oscillator circuit as detection signals; and
- an output amplifier circuit which receives an output from the detector circuit.
5. An angular velocity detector circuit comprising: - a quartz crystal oscillator which is provided with a first electrode and a second electrode installed perpendicularly to the first electrode for driving the oscillator;
- a third electrode connected to the second electrode, and a fourth electrode and a fifth electrode installed on the opposite plane of the third electrode, for taking out an electric field generated by rotation of the oscillator;
- an oscillator circuit having an inverting amplifier with an input terminal connected to the first electrode and an output terminal connected to the second electrode of the quartz crystal oscillator;
- a differential amplifier circuit having input terminals connected to the fourth and fifth electrodes of the crystal oscillator;
- a detector circuit which receives an output from the differential amplifier circuit and using an output from the oscillator circuit as detection signals; and
- an output amplifier circuit which receives an output from the detector circuit.
6. An angular velocity detector circuit comprising: - a quartz crystal oscillator which is provided with a first electrode and a second electrode installed perpendicularly to the first electrode for driving the oscillator;
- a third electrode connected to the second electrode, and a fourth electrode installed perpendicularly to the third electrode, and a fifth electrode installed on the opposite plane of the fourth electrode, for taking out an electric field generated by rotation of the oscillator;
- an oscillator circuit having an inverting amplifier with an input terminal connected to the first electrode and an output terminal connected to the second electrode of the quartz crystal oscillator; a differential amplifier circuit having input terminals connected to the fourth and fifth electrodes of the quartz crystal oscillator;
- a detector circuit which receives an output from the differential amplifier circuit and using an output from the oscillator circuit as detection signals; and
- an output amplifier circuit which receives an output from the detector circuit.
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