JPS60374A - Magnetic sensor - Google Patents

Abstract

PURPOSE:To obtain the high reliabilty of the titled device with a simple constitution without being influenced by a temperature change or the like by fixing a magnetic body on a piezo-electric element and displacing the piezo-electric element in accordance with the change of a magnetic field. CONSTITUTION:The magnetic body 2 is fixed on a conductive elastic body 1 and the piezo-electric element 4 forming electrodes on both the ends is also fixed on the elastic body 1. One electrode 3 of the piezo-electric element 4 is electrically connected to the elastic body 1, a terminal pin 6 is drawn out from the elastic body 1 through a base board 5 and the other electrode 3 is connected to a terminal pin 8 through a lead wire 7. If the external magnetic field is changed, the magnetic body 2 senses the variation, the elastic body 1 is displaced and then the piezo-electric element 4 is also displaced. Electric signals are generated on the terminal pins 6, 8 by the displacement and the variation of the external magnetic field can be sensed by detecting the electric signals.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic sensor f, which has particularly high reliability (
The present invention proposes a new magnetic sensor that has a simple configuration and is not affected by changes in quality.

An embodiment of the present invention will be described below based on the drawings. 1st
In the figure, a magnetic material 2 is fixed on a single conductive elastic material, and a piezoelectric element 4 having thunder camellias 3.3 formed on both sides is fixed thereon. One electrical contact 3 of the piezoelectric element 4 is electrically connected to the elastic body 1 and I-, and a terminal pin 6 is led out from the elastic body 1 via the base 5f. It is connected to the terminal pin 8Vc via the lead wire 7 on the surface. C is a non-magnetic case made of glass, plastic, etc. With the above configuration, the magnetic body 2 responds to fluctuations in the external magnetic field, the elastic body 1 is displaced, and the piezoelectric element 4 is displaced. A signal is generated at the terminal pin 6;8, and by detecting this electric signal, it is possible to sense fluctuations in the external magnetic field.

For example, if this sensor is used as a frequency meter, iy is the object of broken counting (not shown), vc, as shown in Figure 2, when a π sandstone of 1° is taken, the sensor is installed near the movement trajectory of this magnet 1o. do. As the magnet 1o passes across the terminal pin 6.
From 8, Denki Shinshu is born ('',,, and h is the number of words that can be counted) to count the luck of the object of prayer counting ■11 times.

Also, as shown in Figure 6, counting is performed by moving the magnet 10 that moves in conjunction with the movement of the object to be counted closer to or farther away from the sensor. do. In Figure 4,
An electrode 3.3 is formed on both sides of the snow compacted snow element 4, and the edge of the element 4 is fixed to a protrusion 11.11 of a base 5, so that it is itself movable. A magnetic material 2 is fixed to the center of this piezoelectric element. In this example, the piezoelectric element also serves as a diaphragm, making the structure simple. In FIG. Vibration plate IVc, lightning feed 3 on both sides
．． 3 is formed and the piezoelectric element 4 is fixed. In this example, the diaphragm and the magnetic body are both used.

Note that the above sensor is not limited to a frequency meter, but can also be applied to a tachometer, speedometer, etc.

Further, a permanent magnet may be used as the magnetic body in the sensor, and in this case, for example, the magnetic body may be fixed to the object to be counted and its movement may be detected.

As described above, according to the present invention, since the magnetic material is fixed to the I+ lightning element and the piezoelectric element is displaced as the magnetic field changes to perform detection, the reliability is high due to non-contact (the configuration is simple). This makes it inexpensive.Furthermore, it is not affected by changes in wet protection and can be made small and lightweight.

In particular, we are proud of frequency meters and tachometers, etc., and the detection speed depends on the elastic wheels and shape of the elastic body, but VCC can be detected up to about every 10 milliseconds. Every 1
Can be detected in less than a millisecond,

[Brief explanation of drawings]

Figure 1 is a sectional view showing one embodiment of the present invention, Figures 2 and 3 are explanatory diagrams showing how the sensor shown in Figure 1 is used, and Figures 4 and 5 are (lb This is a cross-sectional view showing an example of 2... Magnetic material 3.3... Electrode 4...
・・・Piezoelectric element and above Applicant Seiko Co., Ltd. Shabushi Patent Attorney Tsutomu Mogami Figure 1 Figure 3 Figure 5 Figure 2 Figure 4

Claims (1)

[Claims] A magnetic sensor consists of a magnetic material and a piezoelectric element that is fixed to the magnetic material and is displaced when the magnetic material responds to changes in the magnetic field.