JPH112561A - Vibration detecting sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration detecting sensor which is small-sized and has good sensitivity characteristic, and the sensitivity of which can be adjusted easily by fixing a second permanent magnet to a case, and arranging a magnetic pole to produce repulsion in a space up to a first permanent magnet. SOLUTION: A second permanent magnet 5 is fixed to a screw shaft 6 engaged with the end of a frame 2, so that the position is adjusted by rotation of the screw shaft 6. A first permanent magnet 3 is inserted in the frame 2 to be opposite to the second magnet so that the respective magnetic poles of both magnets repel each other. When a vibration detecting sensor 1 is kept vertical with the permanent magnet 5 on the lower side, the permanent magnet 3 is floated and static when the magnet repulsive force and the dead load are balanced, but it is changed in its position by a little vibration. Accordingly, good sensitivity can be obtained in a small-sized device. When the permanent magnet 3 is displaced to approach, a lead switch 4 of a magnetic detecting means is turned on to send a signal. In this arrangement, when a predetermined vibration is applied to turn on (off) the lead switch 4, the screw shaft 6 is rotated to lower (raise) the position of the permanent magnet 5 to fix the permanent magnet 5 in the obtained on-off boundary position. Accordingly, sensitivity can be adjusted easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration detecting sensor having a reed switch and a permanent magnet and intended to sense only one-dimensional vibration, and which has a simple structure and can be miniaturized. More particularly, the present invention relates to a vibration detection sensor that can easily detect a fish signal in fishing.

[0002]

2. Description of the Related Art A fish signal in fishing can be known by mounting a one-dimensional vibration detection sensor which emits a signal in response to a fish pull on a fishing rod. No sensors can be manufactured at low cost,
Its appearance was sought.

As a one-dimensional vibration detection sensor, a method in which a semiconductor sensor is attached to the base of a cantilever is known. When vibration is generated, the cantilever is deformed and the resistance of a semiconductor gauge is changed. It is converted into a signal and sensed. However, in this method, there is a possibility that the root of the cantilever may be broken due to mechanical fatigue during use, and there is a problem in durability.

As another example, there is a method in which one of a pair of opposed electrodes is fixed, and the other is configured to oscillate by vibration to detect a change in capacitance between the electrodes. However, since the detection is performed based on the change in the gap between the electrodes, it cannot cope with various vibrations, and there is a problem in versatility.

FIG. 3 shows a system disclosed in Japanese Patent Application Laid-Open No. 4-32725 as an improved durability and versatility. In this vibration detection sensor, a reed switch 11, a permanent magnet 12, and a spring 13 are housed in a case 14, and the spring 13 urges the permanent magnet 12 in the axial direction of the case 14. When vibration occurs, the external force acceleration increases. In this method, the permanent magnet is displaced in position by acting on the permanent magnet against the force of the spring, and as a result, the reed switch 11 is turned on to detect the occurrence of vibration. Therefore, this vibration detection sensor can detect only the vibration in the axial direction of the case among the three-dimensional vibrations, and is less likely to be mechanically damaged as in the case of the cantilever method, and has a wide range of vibrations. Is possible.

[0006]

However, Japanese Patent Laid-Open Publication No.
In the vibration detection sensor proposed in Japanese Patent No. 12725, a spring 1 is always attached to a permanent magnet 12 for detecting vibration.
Since the force of 3 is applied, there is a problem that the vibration cannot be detected unless the acceleration that overcomes this works. In addition, a space is required to incorporate the spring 13, and the distance over which the permanent magnet moves can be reduced. Further, if the natural frequency due to the elastic force of the spring overlaps with the vibration of the external force, the vibration may be canceled and accurate detection of the vibration may not be possible.

Further, the sensitivity adjustment method proposed in Japanese Patent Application Laid-Open No. 4-327725 adjusts the mounting position of a reed switch, which complicates the apparatus and requires the movement of electrical wiring parts such as lead wires. There is a problem.

The present invention has been made in view of the above problems, and provides a one-dimensional vibration detection sensor having a small and simple structure, excellent sensitivity characteristics, and easy sensitivity adjustment.

[0009]

Means for Solving the Problems Vibration detection of a structure comprising magnetic detecting means, a first permanent magnet and a case, wherein the magnetic detecting means detects displacement of the position of the first permanent magnet due to externally applied vibration. A second permanent magnet is fixed to the case of the sensor. At this time, the magnetic poles are arranged so as to generate a repulsive force with the first permanent magnet. This vibration detection sensor is configured to be used with the axis of the vibration detection sensor being substantially vertical, and when the vibration detection sensor is supported substantially vertically with the second permanent magnet facing down, the second The first permanent magnet is levitated by the repulsive force of the permanent magnet, and stops at a position that balances with its own weight. When vibration occurs, the force acting on the first permanent magnet is only acceleration due to vibration, excluding gravitational acceleration.

[0010] In addition, each of the two ends of a case of a vibration detection sensor, comprising a magnetic detection means, a first permanent magnet, and a case, wherein the displacement of the position of the permanent magnet due to vibration applied from the outside is detected by the magnetic detection means. The two permanent magnets are fixed, and the magnetic poles are arranged such that each of the second permanent magnets generates a repulsive force with the first permanent magnet. As a result, it is possible to detect vibration even when the posture of the vibration detection sensor is other than substantially vertical.

Further, if the stationary position of the second permanent magnet can be adjusted using a screw mechanism or the like, the stationary position of the first magnet in a steady state can be changed, and the vibration to be detected can be changed. Can be changed in size. When the second magnets are provided at both ends of the case, the positions of the second permanent magnets at both ends may be adjustable, or only one of them may be adjustable.

[0012]

Since the first permanent magnet is supported by the repulsive force of the second permanent magnet and floats in a hollow state or is in a neutral state, the first permanent magnet is displaced even with a minute vibration. Detection is possible, and only vibration in one-dimensional direction is structurally sensed. Furthermore, since the structure is simple, miniaturization becomes easy. In addition, the structure can be a closed structure, and can be used even in a bad environment.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention, and FIG. 2 shows a second embodiment. In addition, this does not limit the present invention.

(First Embodiment) The frame 2 of the vibration detecting sensor 1 is a hollow cylindrical body, a second permanent magnet 5 is fixed at one end inside the frame, and a magnetic detecting means such as a reed switch 4 is provided at the other end. And a columnar first permanent magnet 3 is movably inserted into the cylindrical body. The second permanent magnet 5 is integrally fixed to the screw shaft 6 engaged with the end of the frame 2 disposed at one end of the cylindrical body, and the second permanent magnet 5 is rotated by rotating the screw shaft 6. The position is configured to be adjustable. The magnetic detection means arranged at the other end of the frame 2
In this embodiment, the reed switch 4 is used, but other magnetic detecting means such as a Hall element may be used. It is preferable that the frame 2 be made of a non-magnetic material and have durability against frictional contact by the first permanent magnet 3.

A columnar first permanent magnet 3 is loaded inside the frame 2 and its diameter is selected to be slightly smaller than the inner diameter of the frame 2, so that when the vibration is transmitted to the vibration detection sensor 1, the inside of the frame 2 can be moved smoothly. To do. The movement of the first permanent magnet 3 is also hindered by the air inside the frame 2, but a hole is made in a part of the frame 2 or
By providing the first permanent magnet 3 with a hole or groove penetrating in the axial direction, it is possible to cope with this by making the air flow fluid.

In the frame 2, the first permanent magnet 3 is oriented such that the polarity of the first permanent magnet 3 and the polarity of the second permanent magnet 5 are opposite to each other so as to repel each other.
When the vibration detection sensor 1 is held vertically and the second permanent magnet 5 is held down, the first permanent magnet 3 floats in the air due to the repulsive force of the permanent magnet. Becomes At this time, the first permanent magnet 3 stops when the magnetic repulsive force generated between the first permanent magnet 3 and the second permanent magnet 5 balances with its own weight. The force that stops the movement is only the frictional force with the inner wall of the frame 2, and can freely move when vibration is applied. That is, the first permanent magnet 3 of the vibration detection sensor 1 of the present embodiment is excellent in sensitivity because it displaces the position even with a small amount of vibration, and does not exceed a predetermined value as shown in the conventional example. There is no defect such as built-in spring that does not vibrate.

Next, the operation of the vibration detecting sensor 1 will be described. Now, when the vibration detection sensor 1 suddenly moves downward, the inertia force acts on the first permanent magnet 3 so as to try to stay at the original position, and thus approaches the reed switch 4 provided at the upper end of the vibration detection sensor 1. . If the magnitude of the vibration, that is, its acceleration and amplitude are sufficiently large, the distance between the first permanent magnet 3 and the reed switch 4 approaches a distance sufficient to drive the reed switch 4, and the reed switch 4 is turned on. A signal is output. That is, if the magnitude of the vibration applied to the vibration detection sensor 1 is equal to or larger than a predetermined value, the vibration detecting sensor 1 has a function of detecting the vibration.

In the vibration detection sensor 1 of the present embodiment, the magnitude of vibration that can be sensed is determined by the distance between the reed switch 4 and the first permanent magnet 3 that is floating and stationary. That is, in the vibration detection sensor 1, when the distance between the reed switch 4 and the first permanent magnet 3 in a stationary state is short, the first permanent magnet 3 is sufficiently close to the reed switch 4 even with a small vibration, and the reed switch 4 It turns on, but if the distance between the reed switch 4 and the first permanent magnet 3 in the stationary state of the vibration detection is large, the first reed switch 4 is turned on to a sufficient distance for the reed switch 4 to turn on unless it is a large vibration Permanent magnet 3 cannot move.

Using the above characteristics, the magnitude of the vibration to be sensed can be easily performed in the following procedure. (1) A predetermined vibration is applied to the vibration detection sensor 1 to determine whether or not the reed switch 4 is turned on. (2) When the reed switch 4 is turned on, the screw shaft 6 is turned to lower the position of the second permanent magnet 5,
When the reed switch 4 is off, the position of the second permanent magnet 5 is raised to know the boundary position between on and off, and fix the second permanent magnet 5 at that position.

(Second Embodiment) In FIG. 2, second permanent magnets 5 and 5 are arranged at both ends of a frame 2, and reed switches 4 and 4 are arranged near both ends. The polarities of the second permanent magnets 5 and 5 and the first permanent magnet 3 at both ends are arranged such that opposing faces have the same polarity, so that the first permanent magnet 3 is arranged so that a repulsive force acts from both directions. . As a result, the first permanent magnet 3 stops at almost the center of the cylindrical frame 2 irrespective of the posture of the vibration detection sensor 1.

When the vibration of the frame 2 is applied to the vibration detecting sensor 1 in the axial direction, the first permanent magnet 3 moves, and when one of the two reed switches 4, 4 is sufficiently approached, the closer reed switch 4 is approached. , 4 are turned on, and a signal is output.

In the first embodiment, only vibration in the direction of gravity can be sensed, but in the second embodiment, the vibration can be sensed regardless of the posture of the vibration detection sensor 1 and the direction in which the vibration is sensed. Bidirectional movement can be sensed.

[0023]

As described above, according to the present invention, since the first permanent magnet is floated in the hollow by being supported by the repulsive force of the second permanent magnet, or is in the neutral state, The first permanent magnet is displaced and capable of detecting even a strong vibration, and is configured to sense only a one-dimensional vibration. Furthermore, since there is no need to incorporate mechanical elements such as springs, it is possible to reduce the size.Since the structure is simple, the durability is excellent. Can be used.

The present invention is particularly effective for detecting fish signals in fishing. It is possible to easily detect a desired fish signal by adjusting the magnitude of vibration to be sensed according to the type of fish. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment according to the present embodiment.

FIG. 2 is a longitudinal sectional view showing a second embodiment according to the present embodiment.

FIG. 3 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration detection sensor 2 Frame 3 First permanent magnet 4 Reed switch 5 Second permanent magnet 6 Screw shaft 7 Knob

Claims (5)

[Claims] 1. A vibration detecting sensor comprising a magnetic detecting means, a first permanent magnet, and a case, wherein a displacement of the position of the first permanent magnet caused by externally applied vibration is detected by the magnetic detecting means. And a second permanent magnet having a magnetic pole disposed so as to generate a repulsive force with the first permanent magnet. 2. The vibration detection sensor according to claim 1, wherein the position of the second permanent magnet is adjustable. 3. A vibration detecting sensor comprising a magnetic detecting means, a first permanent magnet, and a case, wherein a displacement of the position of the permanent magnet caused by externally applied vibration is detected by the magnetic detecting means. A vibration detection sensor, wherein second permanent magnets are fixed, and magnetic poles are arranged such that each of the second permanent magnets generates a repulsive force with the first permanent magnet. 4. The vibration detection sensor according to claim 3, wherein at least one of the second permanent magnets provided at both ends of the case is adjustable in position. 5. The vibration detecting sensor according to claim 1, wherein said magnetic detecting means is a reed switch.