JPH08145774A - Vibration sensor - Google Patents

Abstract

PURPOSE: To provide a vibration sensor for sensing one-directional vibration, all-directional vibrations to a plane, and all-directional vibrations to a solid which can be easily produced at low cost with a simple structure by use of a general part element. CONSTITUTION: In this vibration sensor, a spring 2 and a detecting electrode 3 are provided on a weight 1, one end of the spring 2 is mounted on a support body 4, this is put in a shield case 5, and an amplifier 6 provided in the inner part or outer part of the shield case 5 is connected to the detecting electrode 3. In such a structure, the purpose can be attained even by the detecting electrode 3 used also as the spring 2.

Description

Detailed Description of the Invention

[0001]

[Industrial application] This device is a device that senses vibrations and shocks and takes them out as electric signals in the fields where it is necessary to detect vibrations and shocks.

[0002]

2. Description of the Related Art Conventionally, there are combinations of magnets and coils, piezoelectric materials such as piezoelectric ceramics, piezoelectric material elements, resistance wire strain gauges, semiconductor strain gauges, etc.

[0003]

Generally, it is difficult to easily manufacture the above-mentioned columns and the like from the viewpoint of manufacturing the device structure, manufacturing the elements and the like.

Further, the above-mentioned and the like can sense unidirectional vibration such as up and down, left and right, or front and back, but omnidirectional vibration sensing for a plane or omnidirectional vibration for a three-dimensional object is a material. Due to the structure, one vibration sensor is inferior in performance.

The vibration sensor of the present invention has a simple device structure, and the materials of the parts used are common metals and conductors.
High sensitivity and easy production at low cost using materials such as insulators.

In addition to unidirectional sensing such as up / down, left / right, and front / rear, omnidirectional vibration sensing for a plane or omnidirectional sensing for a solid is a single directional vibration. What you can do with the detector.

[0007] The purpose is to be able to detect vibration of a specific low frequency band (about 100 Hz or less) in a specific frequency band with high sensitivity.

[0008]

In order to achieve the above object, a weight is provided with a spring and a detection electrode, and one end of the spring is attached to a support and put in a shield case.

A vibration sensor in which an amplifier and a detection electrode provided inside or outside the shield case are connected.

The object can be achieved even if the spring and the detection electrode are combined.

A vibration sensor in which the outer wall of the weight or the inner wall of the shield case is coated with a dielectric substance which is an insulator.

[0012]

When the vibration sensor constructed as above is vibrated, the weight vibrates within the shield case due to the action of the spring attached to the support, and the output of the amplifier has a voltage corresponding to the vibration. Or, the fluctuation of the current appears.

When the outer wall of the weight or the inner wall of the shield case is coated with a dielectric material which is an insulator, more voltage or current fluctuation appears in the output of the amplifier.

The weight (1), the spring (2), the shield case (5), the insulator (7), etc., have various weights, strengths,
If you use the type, size, or material,
Unidirectionality such as front and back, or omnidirectionality with respect to the surface, or
A single vibration sensor can detect omnidirectional vibrations of a solid body, and can detect a specific frequency band required with high sensitivity.

[0015]

EXAMPLES Examples will be described with reference to the drawings.
In FIG. 1, the weight (1) is attached with a detection electrode (3) which also serves as a spring (2), the other end is attached to a support (4), and is connected to an amplifier (6) such as a semiconductor. Vibration detection that puts it in the shield case (5) and covers the shield case (5) with the mounting board, and detects unidirectional vibrations such as up, down, left and right, front and back by changing the installation direction. In the container, the weight (1), the spring (2), the shield case (5), etc. are flat in cross-section.

FIG. 5 is a vibration sensor for detecting omnidirectional vibrations with respect to a surface. The weight (1), the spring (2), the shield case (5) and the like are circular in cross section. .

FIGS. 9 and 11 show a vibration sensor for detecting omnidirectional vibration with respect to a solid body and a spring (2).
However, in the embodiment diagram showing the one which does not also serve as the detection electrode (3), the weight (1), the shield case (5) and the like are spherical.

[0018]

The effect of the present invention is that the structure of the equipment is simple and the material of the parts used is common metal or conductor,
It can be easily produced at a low cost with high sensitivity using materials such as insulators.

The weight, the spring, the shield case, the insulator, etc. are unidirectional such as vertical, horizontal, front-back, or the like, depending on the weight, strength, type, size, and material depending on the application. It is possible to make a vibration sensor that has omnidirectionality with respect to a plane or omnidirectionality with respect to a solid, and by using the vibration sensor with the required directionality, the purpose can be achieved with one vibration sensor. To be done.

It is possible to detect a specific frequency band which is very low and required with high sensitivity.

As an example of the use of this vibration sensor, a patent application, reference number UGK941125B, date of submission, dated November 25, 1994, is used for the title of the invention, "fish-fishing detector for fishing". Good results have been obtained.

From the above, it is possible to broaden the use applications in the fields where it is necessary to sense various vibrations and shocks.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a unidirectional vibration sensor.

FIG. 2 is a cross-sectional view showing an embodiment of a unidirectional vibration sensor.

FIG. 3 is a cross-sectional view showing an embodiment of a unidirectional vibration sensor.

FIG. 4 is a cross-sectional view showing an embodiment of a unidirectional vibration sensor.

FIG. 5 is a cross-sectional view showing an embodiment of an omnidirectional vibration sensor with respect to a surface.

FIG. 6 is a cross-sectional view showing an embodiment of an omnidirectional vibration sensor with respect to a surface.

FIG. 7 is a cross-sectional view showing an embodiment of an omnidirectional vibration sensor with respect to a surface.

FIG. 8 is a cross-sectional view showing an embodiment of an omnidirectional vibration sensor with respect to a surface.

FIG. 9 is a sectional view showing an embodiment of an omnidirectional vibration sensor with respect to a solid.

FIG. 10 is a sectional view showing an embodiment of an omnidirectional vibration sensor with respect to a solid.

FIG. 11 is a sectional view showing an embodiment of an omnidirectional vibration sensor with respect to a solid body.

FIG. 12 is a cross-sectional view showing an embodiment of an omnidirectional vibration sensor with respect to a solid.

[Explanation of symbols]

 1 Weight 2 Spring 3 Detection electrode 4 Support 5 Shield case 6 Amplifier 7 Insulator

Claims (2)

[Claims] 1. A weight (1) is provided with a spring (2) and a detection electrode (3), one end of the spring (2) is attached to a support (4), and this is put in a shield case (5). A vibration sensor in which an amplifier (6) and a detection electrode (3) provided inside or outside the shield case (5) are connected. 2. The vibration sensor according to claim 1, wherein the outer wall of the weight (1) or the inner wall of the shield case (5) is coated with a dielectric substance which is an insulator (7).