JP2008241700A - Vibration sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly-reliable vibration sensor having improved movable performance of a weight. <P>SOLUTION: The weight 4 loaded with a spring 2 and a magnet 3 is inserted and arranged into a groove part 1a of a case 1, and a lid 6 and a wiring board 8 loaded with a magnetometric sensor 7 are placed thereon through a packing. The weight 4 which is slidable inside the groove part 1a of the case 1 has a constitution provided with a through-hole 4a as a ventilation passage through which gas can be moved. Sliding operation of the weight 4 can be smoothed, while keeping necessary fitting, by using the through-hole 4a as the ventilation passage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration sensor.

  In recent years, vibration sensors that are attached to an object and detect vibrations when the object is moved have been developed. The vibration sensor is attached to an object that should not be moved from its original installation location after installation, such as an ATM, and used for crime prevention to prevent the object from being illegally moved or stolen. ing. The vibration sensor includes a weight that operates due to applied vibration and a sensor that detects the movement of the weight. (See Patent Document 1)

FIG. 6 is an external perspective view showing the vibration sensor. FIG. 7 is a front sectional view of a vibration sensor according to the prior art. FIG. 8 is an exploded perspective view of a conventional vibration sensor.
Reference numeral 1 denotes a housing in which a groove 1a is formed. A spring 2 and a weight 4 on which a magnet 3 is mounted at the end position of the spring 2 are disposed in the groove 1a. The weight 4 has a cylindrical shape, and the groove portion 1 a has a groove shape having a size corresponding to the outer peripheral surface of the weight 4. A lid 6 is attached to the upper portion of the housing 1 via a packing 5. Further, a wiring board 8 is disposed above the lid 6 and is fixed to the upper portion of the housing 1 with screws 9. A magnetic sensor 7 is mounted at a position facing the magnet 3 mounted on the weight 4 of the wiring board 8, and the magnetic sensor 7 is housed in a recess 6 a of the lid 6. In this way, the vibration sensor is configured.

When vibration is applied to the housing 1, the weight 4 slides up and down in the groove 1 a, and the distance between the magnet 3 and the magnetic sensor 7 changes. By detecting the amount of change by the magnetic sensor 7, it is sensed that vibration is applied to the housing 1.
Utility model registration No. 3029313

  In the configuration of the above-described conventional vibration sensor, fitting of the weight and the groove shape is important so that the weight can easily slide in the groove portion of the housing. Therefore, the gap between the weight and the groove is a very small gap in order to obtain smooth movement without rattling. Further, when the groove opening of the vibration sensor is closed with a lid via a packing material or the like, the inside of the groove is completely sealed. For this reason, when the weight slides, the gas inside the groove (the gas existing in the space above and below the weight) disappears, and the reaction of the weight slide operation may be significantly reduced. As a result, even if vibration is applied to the housing, the vibration sensor does not react because the weight itself does not operate, and the vibration level may not be detected.

  In view of the above problems, an object of the present invention is to provide a highly reliable vibration sensor with improved weight sliding performance.

  In order to achieve the above object, a vibration sensor according to the present invention includes at least a weight provided with a spring and a detected element, a housing having a spring and a weight, and a groove serving as a sliding portion of the weight. And a lid that includes a detection element for detecting the position of the element to be detected and is mounted so as to cover the groove of the casing, and when the casing vibrates due to external stress, A vibration sensor for detecting a vibration level by detecting a movement amount of a weight disposed in a groove portion of a body by a detection element provided in the lid, and the weight includes a sliding motion of the weight. An air passage that allows movement of the gas in the groove is formed.

  The air passage can be constituted by a through-hole penetrating in the sliding direction of the weight.

  Moreover, the said ventilation path can be comprised by the notch part provided in the outer peripheral surface of the said weight.

  Furthermore, the vibration sensor of the present invention includes a spring, a weight provided with the detected element, a casing having the spring and the weight and having a groove portion serving as a sliding portion of the weight, and the detected element. A detection element for detecting a position, and a lid mounted so as to cover the groove portion of the housing, and is arranged in the groove portion of the housing when the housing vibrates due to external stress. A vibration sensor for detecting a vibration level by detecting a moving amount of a weight with a detection element provided in the lid, wherein the inner peripheral shape of the groove and the outer peripheral shape of the weight are different shapes. And

  An inner peripheral shape of the groove portion may be a square shape, and the weight may be a cylindrical shape.

  Further, the inner peripheral shape of the groove portion can be a circular shape, and the weight can be a prismatic shape.

  Since the air passage is formed in the weight, gas can be moved through the air passage when the weight slides, the load on the weight due to the gas is greatly reduced, and the weight slides even with slight vibration. It becomes possible. Therefore, a highly accurate vibration sensor can be obtained.

  Also, by making the inner peripheral shape of the housing groove and the outer periphery of the weight different, a gap is secured between the groove and the weight, so this weight can be used as a ventilation path when the weight slides. The gas can be moved, the load on the weight due to the gas is greatly reduced, and the weight can be slid even with slight vibration. Therefore, a highly accurate vibration sensor can be obtained.

  A weight in which a spring and a magnet are mounted inside the housing, and a packing, a lid, a magnetic sensor, and a wiring board are arranged in this order on the top of the housing. When vibration is applied to the housing, the weight is slid within the groove, and the vibration of the housing is detected by changing the distance between the magnet and the magnetic sensor. The weight to be slid inside the housing is provided with an air passage for moving the gas so that the gas can move inside the groove as the weight moves. Since the gas can be ventilated while maintaining the necessary fitting by the air passage, the lubricating motion of the weight can be realized, and a highly reliable vibration sensor can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front sectional view of the vibration sensor according to the first embodiment, and FIG. 2 is an exploded perspective view of FIG. In addition, about the same component as the vibration sensor shown in the prior art, it demonstrates using the same code | symbol.

  A weight 4 on which a spring 2 and a magnet 3 as a detected element are mounted is inserted and disposed in the groove 1 a of the housing 1. The magnet 3 is fixed to the recess 4b of the weight 4 with an adhesive. The weight 4 is configured to be held by inserting a stepped portion 4 c of the weight 4 at the upper end position of the spring 2.

  The housing 1 is made of, for example, a resinous member, and the groove 1a is formed at a substantially central portion of the housing 1. A wiring board 8 on which a lid 6 and a magnetic sensor 7 serving as a detection element for detecting the position of the magnet 3 are mounted via a packing 5 is placed at an upper position of the housing 1. The packing 5 is disposed in order to suppress the entry of foreign matters such as dust from the outside, and the inside of the groove 1a is thereby sealed. The recess 6 a formed in the lid 6 serves as a housing space for the magnetic sensor 7 mounted on the wiring board 8. As described above, the wiring board 8 on which the packing 5, the lid 6, and the magnetic sensor 7 disposed on the upper portion of the housing 1 are stacked has the opening of the groove portion 1 a of the housing 1 by the screw 9 in a stacked state. The vibration sensor is configured to be fixed so as to cover.

  In this embodiment, the weight 4 slidably movable inside the groove 1a of the housing 1 is provided with a through hole 4a for moving the gas inside the groove 1a. The through-hole 4a is a hole that penetrates the weight 4 in the sliding movable direction (vertical direction in FIG. 1). With such a configuration, the through-hole 4a is connected to the gas ventilation path inside the groove 1a. Therefore, the sliding operation can be lubricated without dulling the operation of the weight 4 while maintaining the necessary fitting between the weight 4 and the groove 1a.

  FIG. 3 is an exploded perspective view of the vibration sensor according to the second embodiment. Since the basic configuration is the same as that of the first embodiment, only different configurations will be described.

  Reference numeral 10 denotes a weight, and a notch 10 a is formed on the outer peripheral surface of the weight 10. The notches 10a are provided at four locations on the outer peripheral surface of the weight 10, and the notches extend in the same direction as the sliding movable direction in the groove 1a of the casing 1 of the weight 10. is there.

  With such a configuration, when the weight 10 is disposed in the groove 1a of the housing 1, a gap is formed between the notch 10a and the inner surface of the groove 1a facing the notch 10a. Therefore, since this notch 10a acts as a gas ventilation path inside the groove 1a, the sliding operation is lubricated without dulling the operation of the weight 10 while maintaining the necessary fitting between the weight 10 and the groove 1a. Can be.

  FIG. 4 is an exploded perspective view of the vibration sensor according to the third embodiment. Since the basic configuration is the same as that of the above-described embodiment, only different configurations will be described.

  4 is a weight and is formed in a cylindrical shape. The weight 4 is not formed with through holes or notches as in the first and second embodiments described above, and has the same form as the weight described in the prior art. Reference numeral 1b denotes a groove formed in the housing 1, and the shape thereof is an inner peripheral shape formed into a square shape.

  With such a configuration, when the weight 4 is disposed in the groove 1b of the housing 1, the outer peripheral shape of the weight 4 and the inner peripheral shape of the groove 1b in which the weight 4 is disposed are different, that is, When viewed in plan, the weight 4 has a circular shape, and the groove portion 1b has a square shape and is different from each other. Therefore, when these are combined, gaps are inevitably generated at the four corners of the groove portion 1b. Therefore, the gap acts as a gas passage inside the groove 1b, and the sliding operation is lubricated without slowing the operation of the weight 4 while maintaining the necessary fitting between the weight 4 and the groove 1b. be able to.

  FIG. 5 is an exploded perspective view of the vibration sensor according to the fourth embodiment. Since the basic configuration is the same as that of the above-described embodiment, only different configurations will be described.

  11 is a weight and is formed in a prismatic shape. Reference numeral 1a denotes a groove formed in the housing 1, and the shape thereof is a circular inner peripheral shape.

  With such a configuration, when the weight 11 is arranged in the groove 1a of the housing 1, the outer shape of the weight 11 and the inner shape of the groove 1a in which the weight 11 is arranged are different, that is, The shape of the weight 11 when viewed from above is a square, and the inner peripheral shape of the groove 1a is circular and different from each other. Therefore, when these are combined, the inner wall surface of the groove 1a and the opposing portion of the side surface of the weight 11 are necessarily formed. A gap will occur in a part. Therefore, the gap acts as a gas passage inside the groove 1a, and the sliding operation of the weight 4 is lubricated without dulling the sliding operation of the weight 4 while maintaining the necessary fitting between the weight 11 and the groove 1a. Can be.

  Although one embodiment of the present invention has been described as described above, the present invention is not limited to the above-described embodiment, and the configurations of the embodiments are appropriately combined and omitted without departing from the spirit of the present invention. It is also possible to combine with other configurations not shown.

Front sectional view of a vibration sensor according to a first embodiment of the present invention (Example 1) 1 is an exploded perspective view of a vibration sensor according to a first embodiment of the present invention (Embodiment 1). Exploded perspective view of a vibration sensor according to a second embodiment of the present invention (Embodiment 2) Exploded perspective view of a vibration sensor according to a third embodiment of the present invention (Embodiment 3) Exploded perspective view of a vibration sensor according to a fourth embodiment of the present invention (Embodiment 4) External perspective view showing vibration sensor Front sectional view of a vibration sensor according to the prior art Exploded perspective view of a vibration sensor according to the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing | casing 1a Groove part 1b Groove part 2 Spring 3 Magnet 4 Weight 4a Through-hole 4b Recess 4c Stepped part 5 Packing 6 Lid 7 Magnetic sensor 8 Wiring board 9 Screw 10 Weight 10a Notch part 11 Weight

Claims (6)

at least,
A spring and a weight equipped with a detected element;
A housing having a groove portion that is a weight and a sliding portion of the weight;
Comprising a detection element for detecting the position of the detected element, and comprising a lid mounted so as to cover the groove of the housing;
When the casing vibrates due to external stress, the vibration sensor detects a vibration level by detecting a movement amount of a weight disposed in a groove portion of the casing with a detection element provided in the lid,
The vibration sensor according to claim 1, wherein an air passage is formed in the weight so that the gas in the groove portion can move in accordance with a sliding operation of the weight.   2. The vibration sensor according to claim 1, wherein the air passage is configured by a through-hole penetrating in a sliding direction of the weight.   The vibration sensor according to claim 1, wherein the air passage is configured by a notch provided in an outer peripheral surface of the weight. at least,
A spring and a weight equipped with a detected element;
A housing having a groove portion that is a weight and a sliding portion of the weight;
Comprising a detection element for detecting the position of the detected element, and comprising a lid mounted so as to cover the groove of the housing;
When the casing vibrates due to external stress, the vibration sensor detects a vibration level by detecting a movement amount of a weight disposed in a groove portion of the casing with a detection element provided in the lid,
The vibration sensor, wherein an inner peripheral shape of the groove and an outer peripheral shape of the weight are different.   The vibration sensor according to claim 4, wherein an inner peripheral shape of the groove portion is a square shape, and the weight is a cylindrical shape.   The vibration sensor according to claim 4, wherein an inner peripheral shape of the groove portion is a circular shape, and the weight is a prismatic shape.

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