JPH06147898A - Sensitivity measuring equipment for angular speed sensor - Google Patents

Abstract

PURPOSE:To obtain an inexpensive sensitivity measuring equipment for angular speed sensor which can measure sensitivity and response of angular speed sensor. CONSTITUTION:A post 16 is erected on a base 14 and a plate member 20 is fixed to the post 16 with a rotary shaft 18. An angular speed sensor holder 22 is formed on the plate member 20 and an angular speed sensor 30 is held therein. A frequency generator 26 drives a voice coil 24 to rock the plate member 20 to describe an arch around the rotary shaft 18. A displacement sensor 28 is formed at a position separated by a distance L from the post 16 and vertical displacement of the plate member 20 is measured at that position. An angular speed to be provided to an angular speed sensor is then calculated based on the position of the displacement sensor 28 and the displacement of the plate member 20 thus measured. The angular speed thus calculated is compared with an output signal from the angular speed sensor 30 thus measuring sensitivity of the angular speed sensor 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angular velocity sensor sensitivity measuring device, and more particularly to an angular velocity sensor sensitivity measuring device for measuring the sensitivity of, for example, a vibration gyro or a coma gyro.

[0002]

2. Description of the Related Art FIG. 4 is an illustrative view showing an example of a conventional angular velocity sensor sensitivity measuring apparatus which is the background of the present invention.
The sensitivity measuring device 1 includes a disc-shaped turntable 2. A shaft 3 is formed in the center of the turntable 2, and the shaft 3 is connected to a driving device 4 such as a motor. Then, the drive device 4 causes the turntable 2 to rotate at a constant rotation speed.

To measure the sensitivity of the angular velocity sensor, the angular velocity sensor 5 is held on the turntable 2. Then, the turntable 2 is rotated at a constant rotation speed, and the output signal of the angular velocity sensor 5 is measured. The output signal of the angular velocity sensor 5 is measured, for example, via a slip ring or the like. Then, the sensitivity of the angular velocity sensor 5 can be measured from the relationship between the angular velocity of the turntable 2 and the output signal of the angular velocity sensor 5.

[0004]

However, in such an angular velocity sensor sensitivity measuring apparatus, the rotational stability of the turntable and the rotational speed measurement accuracy determine the angular speed sensor sensitivity measurement accuracy. Therefore, expensive equipment is required for rotation control of the turntable and rotation speed measurement.

Further, when the angular velocity sensor is used for detecting a camera shake in a video or a shake of an automobile, the angular velocity is not constant but the angular velocity itself changes. Therefore, it is necessary to measure the response of the angular velocity sensor to changes in the angular velocity, but this sensitivity measuring device cannot change the angular velocity itself. Therefore, this sensitivity measuring device cannot measure the response of the angular velocity sensor.

Therefore, a main object of the present invention is to provide an inexpensive angular velocity sensor sensitivity measuring device capable of measuring the sensitivity and responsiveness of the angular velocity sensor.

[0007]

According to the present invention, a seesaw, an angular velocity sensor holder formed on the seesaw, a voice coil for operating the seesaw formed on one side of the seesaw, and a displacement of the seesaw are provided. It is a sensitivity measuring device of an angular velocity sensor including a displacement sensor for measuring.

[0008]

By operating the seesaw using the voice coil, it is possible to give an angular velocity to the angular velocity sensor held by the angular velocity sensor holder. Then, by measuring the displacement of the seesaw with the displacement sensor, the angular velocity given to the angular velocity sensor is calculated. Further, by changing the frequency for driving the voice coil, the angular velocity given to the angular velocity sensor changes.

[0009]

According to the present invention, an accurate angular velocity can be calculated by measuring the displacement of the seesaw with the displacement sensor. Therefore, the sensitivity of the angular velocity sensor can be measured from the relationship between the angular velocity and the output signal of the angular velocity sensor. Further, by changing the driving frequency of the voice coil, the angular velocity given to the angular velocity sensor is changed, and the response of the angular velocity sensor can be measured by comparing with the change of the output signal obtained from the angular velocity sensor. In this sensitivity measuring device, if the voice coil and the frequency generator for driving the voice coil are provided, the operation of the seesaw can be accurately changed, and the displacement of the seesaw can also be accurately measured by the displacement sensor. Therefore, unlike the conventional sensitivity measuring device, an expensive control device or measuring device is unnecessary, and the sensitivity measuring device of this angular velocity sensor can be manufactured at low cost.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0011]

1 is an illustrative view showing one embodiment of the present invention. The sensitivity measuring device 10 of the angular velocity sensor is a seesaw 12
including. The seesaw 12 includes a base 14. A pillar 16 is formed at the center of the base 14. A rotation shaft 18 extending in the lateral direction is formed on the top of the pillar 16. This rotating shaft 18
The central portion of the plate body 20 is attached to. Therefore,
The plate body 20 can be swung so as to draw an arc around the rotation axis 18. An angular velocity sensor holder 22 is formed in the center of the plate body 20. The angular velocity sensor holder 22 holds an angular velocity sensor described later.

A voice coil 24 for operating the seesaw 12 is attached to one side of the plate body 20. The voice coil 24 is driven by the frequency generator 26. As the voice coil 24, for example, a large displacement voice coil that resonates at about 50 Hz is used. Then, a reciprocating motion is generated by the frequency generator 26. The voice coil 24 has a good responsiveness and can accurately change the displacement cycle in response to the frequency change of the frequency generator 26. By the voice coil 24, the plate body 20 swings so as to draw an arc around the rotary shaft 18.

A displacement sensor 28 is attached to the other side of the plate body 20. The displacement sensor 28 is attached at a distance L from the column 16. Then, at that position, the amount of vertical displacement of the plate body 20 is measured.

When the sensitivity measuring device 10 is used, the angular velocity sensor 30 is held on the angular velocity sensor holder 22. Then, the voice coil 24 is driven by the signal from the frequency generator 26. As a result, the plate body 20 of the seesaw 12 swings. At this time, the displacement sensor 28
Thus, the amount of vertical displacement of the plate body 20 at that position is measured. When the amplitude of the plate body 20 is a, the angular velocity given to the angular velocity sensor 30 is expressed by the following equation. Angular velocity = cos {(tan ⁻¹ a / L) ωt} · ω
(Deg / sec)

Then, by measuring the output signal of the angular velocity sensor 30 and comparing it with the angular velocity calculated by the above equation,
The sensitivity of the angular velocity sensor 30 can be measured. The amount of displacement obtained by the displacement sensor 28 and the angular velocity sensor 3
The output signal of 0 has a relationship as shown in FIG. The angular velocity becomes 0 when the displacement is maximum, that is, when the plate body 20 is most inclined. Further, the angular velocity becomes maximum when the displacement is 0, that is, when the plate body 20 is horizontal. Therefore, the output signal of the angular velocity sensor 30 is delayed by 90 ° with respect to the change in the displacement amount of the plate body 20.

Next, when measuring the response of the angular velocity sensor 30, the frequency of the signal output from the frequency generator 26 is changed. Along with this, the displacement period of the voice coil also changes, and the angular velocity given to the angular velocity sensor 30 also changes. When the responsiveness of the angular velocity sensor 30 is good, a signal delayed by 90 ° is output following the change in the displacement cycle of the plate body 20. However, when the responsiveness of the angular velocity sensor 30 is poor, it cannot follow the change in the displacement period of the plate body 20, and a phase shift occurs as shown in FIG. Therefore, by changing the frequency of the frequency generator 26, the plate 2
By measuring the phase shift between the displacement of 0 and the output signal of the angular velocity sensor 30, the responsiveness of the angular velocity sensor 30 can be measured.

In this sensitivity measuring device 10, the seesaw 12 is used.
A simple device can be used for driving and measuring the displacement of the plate 20. Therefore, the sensitivity measuring device can be manufactured at a low cost as compared with the conventional device in which the rotation must be accurately controlled.

[Brief description of drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the displacement of the sensitivity measuring device for the angular velocity sensor shown in FIG. 1 and the output signal of the angular velocity sensor.

FIG. 3 is a graph showing an output signal of the angular velocity sensor when the displacement cycle of the sensitivity measuring device is changed.

FIG. 4 is an illustrative view showing one example of a conventional sensitivity measuring device for an angular velocity sensor, which is the background of the present invention.

[Explanation of symbols]

 10 Sensitivity Measuring Device of Angular Velocity Sensor 12 Seesaw 20 Plate 22 Angular Velocity Sensor Holder 24 Voice Coil 28 Displacement Sensor 30 Angular Velocity Sensor

Claims (1)

[Claims] 1. A seesaw, an angular velocity sensor holder formed on the seesaw, a voice coil formed on one side of the seesaw for operating the seesaw, and a displacement sensor for measuring a displacement of the seesaw. An angular velocity sensor sensitivity measuring device, including: