JP2008241701A - Vibration sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly-reliable vibration sensor. <P>SOLUTION: A magnet 2 is provided on an upper part of a weight 1, and the weight 1 and a spring 3 are put into a groove 4a of a case 4. A planar lid 7 is mounted over the weight 1. A sealing material 5 is inserted and arranged between the case 4 and the lid 7, to thereby prevent invasion of refuge or the like from the outside into the groove 4a. The sealing material 5 has a constitution arranged on the whole surface facing to the lid 7 excluding a groove 4a opening part of the case 4. A magnetic detection element 6 is provided on a portion facing to the magnet 2 provided on the weight 1, on an upper part of the lid 7, and intensity fluctuation of a magnetic force caused by movement of the weight is converted into an output voltage, and the voltage is outputted from an output terminal 9 to the outside. Movement can be performed independently by supplying a power source from the output terminal 9 and by loading a battery 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration sensor.

As a sensor for detecting the vibration level of an object, a weight having a spring and a detected element attached thereto, a housing having a groove serving as a sliding portion of the weight, and a detecting element for detecting the position of the detected element As the casing vibrates, the weight with the spring and the element to be detected moves up and down to detect vibration based on a change in the output level of the detection element. Vibration sensors are known. (For example, see Patent Document 1)
Utility model registration No. 3029313

  When mounting the above-mentioned conventional vibration sensor on the product, to fix it to the product, modularize other signal processing boards, etc., or to hide it so that it will not be noticeable after the product is completed Must be covered with a filler. In this case, some sealing means is necessary to prevent the filler from entering the sliding portion of the weight inside the housing.

  The above-described conventional vibration sensor is used as a means for detecting vibrations of machines, automobiles, electrical products and the like, and is used for crime prevention such as theft, and further improvement in crime prevention and durability is required.

  In the configuration of the conventional vibration sensor described above, when the weight moves up and down, the weight may collide with the housing, and the detected element or the housing mounted on the weight or the weight may be damaged.

  When the weight of the vibration sensor moves up and down, it collides with the casing, and the vibration sensor is recognized by the collision sound, so that the crime prevention property is deteriorated.

  Moreover, if the magnet mounted on the weight is too far from the magnetic detection element, the sensitivity is deteriorated.

  Further, when the sealing material adversely affects the curing of the filler, there is a problem that the periphery of the sealing material is not cured and easily enters the housing.

  An object of the present invention is to provide a highly reliable vibration sensor.

  In a vibration sensor for detecting vibration of an object, a weight having a spring and a detected element, a housing having a groove serving as a sliding portion of the weight, and detection for detecting the position of the detected element A lid provided with an element, and a sealing material for preventing foreign matter from entering the sliding portion between the casing and the lid, and as the casing vibrates, a spring and a cover are provided. The weight including the detection element is a vibration sensor that detects vibration by moving the sliding portion and changing the output level of the detection element.

  The sealing material is a vibration sensor that covers at least a part of the opening of the groove.

  The lid is a vibration sensor in which a recess is formed at a position facing the groove.

  A vibration sensor in which the periphery or part of the casing is covered with a filler is used.

  A vibration sensor in which the filler is a silicone-based filler and the sealing material is a silicone-based sealing material.

  The detection element is a magnetic detection element, and the detected element is a vibration sensor.

  According to the configuration of the vibration sensor of the present invention, since the sealing material is provided between the housing and the flat plate to prevent the foreign matter from entering the sliding portion, the weight can be moved by entering the foreign material or entering the filler. A highly reliable vibration sensor can be obtained without adversely affecting the performance.

  According to the configuration of the vibration sensor of the present invention, when the sealing material covers at least a part of the opening of the groove, the weight is also disposed in the upward direction, and the weight moves upward. Therefore, there is an effect that a vibration sensor with excellent durability can be realized.

  According to the configuration of the vibration sensor of the present invention, the recess is provided at a position facing the groove of the lid, so that the cushioning property of the sealing material is further improved, and the detection element attached to the weight and the detection attached to the lid. There is an effect that the distance from the element can be shortened and a vibration sensor with high sensitivity can be realized.

  Hereinafter, embodiments of the vibration sensor of the present invention will be described in detail with reference to the drawings.

  1 and 2 are views showing a configuration of an embodiment of a vibration sensor according to the present invention, and FIG. 1 is a front sectional view of the vibration sensor. FIG. 2 is a side sectional view seen from the side.

  As shown in FIGS. 1 and 2, the weight 1 is provided with a magnet 2 and a spring 3, and the weight 1 is placed in the groove 4 a of the housing 4. A flat lid 7 is attached above the weight 1. A sealing material 5 is interposed between the casing 4 and the lid 7 to prevent entry of dust and the like from the outside into the groove 4a. The sealing material 5 is configured to be disposed on the entire surface facing the lid 7 except for the opening of the groove 4 a of the housing 4.

  A magnetic detection element 6 is provided on the top of the lid 7 at a portion facing the magnet 2 provided on the weight 1, and the strength of the magnetic force due to the movement of the weight 1 is changed to an output voltage, which is output to the outside by an output terminal 9 To do.

  The module is completed by incorporating the housing 4 into the outer cover 8 and surrounding the periphery with a filler 10. The sealing material 5 is made of silicone rubber, and the filler 10 is also made of a silicone-based filler. The sealing material 5 can also prevent the filler 10 from entering the groove 4a.

  In addition to receiving power from the output terminal 9, it can be moved independently by mounting a battery 11.

  When the vibration is applied to the module, the magnet 2 approaches or separates from the magnetic sensing element 6 as the weight moves up and down, so that the output voltage changes and the vibration can be detected.

  FIG. 3 is a front sectional view showing another embodiment of the vibration sensor according to the present invention. The basic configuration is the same as that of the first embodiment shown in FIGS. The present embodiment is different from the first embodiment in that the sealing material 5a covers the opening of the groove 4a and the lid 7 is attached.

  The sealing material 5a is made of silicone rubber or the like. According to this configuration, when the weight 1 is raised, the silicone rubber sealing material 5 does not directly collide with the lid 7 but becomes a cushioning material, thereby realizing a vibration sensor with excellent silence and good durability.

  FIG. 4 is a front sectional view showing another embodiment of the vibration sensor according to the present invention. The sealing material 5b covering the opening only needs to function as a cushioning material, and does not need to cover the entire opening of the groove 4a as shown in FIG. 3, and may have a shape covering a part of the opening of the groove 4a.

  FIG. 5 is a front sectional view and a partially enlarged view of another embodiment of the vibration sensor according to the present invention.

  By providing the recess 12 facing the groove 4a on the sealing material 5a side of the lid 7, the buffer 1 has excellent buffering properties when it collides with the sealing material 5a, and the distance from the magnetic sensing element 6 is also large. Therefore, a vibration sensor having excellent durability and good sensitivity can be realized.

The figure which shows the structure of one Example of the vibration sensor concerning this invention, and is front sectional drawing. The figure which shows the structure of one Example of the vibration sensor concerning this invention, and side sectional drawing. FIG. 6 is a front sectional view of another embodiment of the vibration sensor according to the present invention. FIG. 6 is a front sectional view of another embodiment of the vibration sensor according to the present invention. In other Example of the vibration sensor concerning this invention, front sectional drawing and the elements on larger scale.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Weight 2 Magnet 3 Spring 4 Case 4a Groove 5 Sealing material 5a Sealing material 5b Sealing material 6 Magnetic detection element 7 Lid 8 Outer cover 9 Output terminal 10 Filling material 11 Battery 12 Recessed part

Claims (6)

In a vibration sensor that detects the vibration of an object,
A weight comprising a spring and a detected element;
A housing having a groove serving as a sliding portion of the weight;
A lid provided with a detection element for detecting the position of the detected element;
A sealing material for preventing foreign matter from being mixed into the sliding portion between the casing and the lid;
As the casing vibrates, the weight including the spring and the element to be detected moves the sliding portion, and the vibration level is detected by changing the output level of the detection element. The sealing material is
The vibration sensor according to claim 1, wherein at least a part of the opening of the groove is covered. The lid has
The vibration sensor according to claim 1, wherein a recess is formed at a position facing the groove.   The vibration sensor according to any one of claims 1 to 4, wherein a periphery or a part of the casing is covered with a filler. The filler is a silicone-based filler;
The vibration sensor according to claim 4, wherein the sealing material is a silicone-based sealing material. The detection element is a magnetic detection element;
The vibration sensor according to claim 1, wherein the element to be detected is a magnet.

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