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Angular speed sensor

An angular velocity sensor and angular velocity technology, applied to instruments, gyro effects for speed measurement, speed/acceleration/shock measurement, etc., can solve the problems of damaging the oscillator 101 and unable to remove useless signals, etc.

Inactive Publication Date: 2012-05-23
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] If the oscillator 101 is miniaturized along with the miniaturization of the angular velocity sensor 5002, the oscillator 101 may be damaged when the lower part of the vibrating body 103 is cut off, and in this case, useless signals generated from the angular velocity sensor 5002 cannot be removed.

Method used

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Experimental program
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Embodiment approach 1

[0041] figure 1 It is a circuit diagram of angular velocity sensor 1001 according to Embodiment 1 of the present invention.

[0042] The sensor element 30 is provided with: a vibrating body 31, a driving electrode 32 having a piezoelectric body for vibrating the vibrating body 31, a monitoring electrode 33 having a piezoelectric body that generates charges according to the vibration of the vibrating body 31, and a sensor element having a 30 Sensing electrodes 34, 35 of piezoelectric bodies that generate charges when angular velocity is applied. The sensing electrodes 34, 35 generate charges of opposite polarity. In the charge amplifier 36, the charge output from the monitor electrode 33 is amplified by a predetermined magnification and converted into a voltage. A band-pass filter (BPF) 37 outputs a monitor signal after removing noise components of the voltage output from the charge amplifier 36 . The automatic gain control (AGC) circuit 38 has a half-wave rectifying and sm...

Embodiment approach 2

[0067] Figure 4 It is a circuit diagram of angular velocity sensor 1002 according to Embodiment 2 of the present invention.

[0068] The sensor element 130 is provided with: a vibrating body 131, a driving electrode 132 having a piezoelectric body for vibrating the vibrating body 131, a monitoring electrode 133 having a piezoelectric body that generates charges according to the vibration state of the vibrating body 131, and a sensor The sensing electrodes 134, 135 of the piezoelectric body that generate electric charges when the element 130 is applied with angular velocity. The sensing electrodes 134, 135 generate charges of opposite polarity. The charge output from the monitor electrode 133 is amplified by a predetermined magnification in the charge amplifier 136 and converted into a voltage. A band-pass filter (BPF) 137 removes a noise component of the voltage output from the charge amplifier 136, and then outputs a monitor signal. An automatic gain control (AGC) circuit...

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PUM

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Abstract

An angular velocity sensor includes a vibration, first and second sensor electrodes generating an electric charge responsive to an angular velocity applied to the vibration body, first and D / A converters each outputting at least two levels of an electric charge, first and second integrator circuits integrating the electric charge generated by the first and second sensor electrodes and the electric charges output from the first and second D / A converters, respectively, a comparator unit comparing output signals from the first and second integrator circuits, first and second D / A switching units switching levels of the output signals from the first and second D / A converters according to a comparison result of the comparator unit, a first disconnection detecting switch connected between the first sensor electrode and the first integrator circuit, a first voltage source for injecting an electric charge into a point between the first sensor electrode and the first integrator circuit via the first disconnection detecting switch, a second disconnection detecting switch connected between the second sensor electrode and the second integrator circuit, and a second voltage source for injecting an electric charge into a point between the second sensor electrode and the second integrator circuit via the second disconnection detecting switch. This angular velocity sensor has a high reliability and performs stable operation even if ambient environment charges.

Description

technical field [0001] The present invention relates to an angular velocity sensor used in attitude control or navigation systems of mobile bodies such as aircraft and vehicles. Background technique [0002] Figure 11 It is a circuit block diagram of the angular velocity sensor 5001 in the prior art disclosed in patent document 1. Figure 12 It is a block diagram of the drive circuit 6 and the failure detection circuit 7 of the angular velocity sensor 5001. [0003] A crystal oscillator 1 made of an H-shaped piezoelectric body includes a pair of drive units 2 and a pair of detection units 3 arranged on opposite sides of the pair of drive units 2 . Sensing electrodes are provided in the detection unit 3 . [0004] A drive electrode 4 is provided in one drive section 2 , and a drive detection electrode 5 is provided in the other drive section 2 . The drive circuit 6 is electrically connected to the drive electrode 4 and the drive detection electrode 5 of the oscillator 1, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/5614G01C19/56
CPCG01C19/5614
Inventor 村上英之川井孝士锅谷公志小川壮彦
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD