JP2008096222A - Accelerometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accelerometer capable of very simply measuring the acceleration in the multiaxial directions, using a simple constitution, without causing the utilization environment to be limited or without requiring complex measurement systems, such as scientific reactions or electric circuits. <P>SOLUTION: The accelerator 1 comprises a closed box body 10, having a first plate member 11 and a second plate member 12 arranged facing a center body 15 fixed inside the box body 10; a plurality of elastic bodies 20, that has a base end section fixed to the center body 15, extending toward the outside in a centrifugal direction from the center body 15, arranged extending radially from the center of the center body 15 and each being displaceable only in the centrifugal direction; and weights 25, each of which is provided at the tips of the elastic bodies 20. The first plate member 11 is formed by a transparent member, a plurality of graduated sections 30 are formed concentric with respect to the center of the center body 15 on the outer surface of the member, and acceleration is measured by using the graduated section 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an accelerometer, and more particularly to an accelerometer that can measure acceleration in multi-axis directions very simply.

2. Description of the Related Art Conventionally, an acceleration sensor is known that is attached to various mechanical devices or the like to detect the presence or absence of an abnormal operation state (for example, see Patent Document 1).
In the acceleration sensor disclosed in Patent Document 1, the lateral effect of piezoelectric ceramics is used, and the seismo system is configured in a double manner to detect the acceleration of weak vibrations.

Also, an impact detection device that detects a strong impact applied to the device is known (see, for example, Patent Document 2).
As shown in FIG. 8, in the impact detection device 80 disclosed in Patent Document 2, a plate 83 that is supported by a spring 82 from three directions and is a weight is provided in a space in the case 81. In a substantially central portion of the case 81, a detection hole 81A is formed for receiving light emitted from the light emitter 84 by the light receiver. When an impact is applied to the case 81, the spring 82 extends in the impact direction, so that the plate 83 blocks light emitted from the light emitter 84. Thus, the photoreceptor detects the light blockage and sends a signal to the microcomputer to detect the impact.

  In addition to Patent Document 1 and Patent Document 2, an accelerometer using a pressure filter (not shown) is also known as an accelerometer capable of relatively easy measurement.

Japanese Utility Model Publication No. 6-26852 JP-A-8-262052

However, in the accelerometer disclosed in Patent Document 1 described above, a piezoelectric bimorph or the like is used, and when measuring the acceleration, an electric signal proportional to the acceleration of the movement of the object to be measured is taken out from an electric terminal such as the piezoelectric bimorph. The measurement is done. Therefore, in addition to the problem that the entire accelerometer becomes a large-scale system, it requires specialized knowledge for measurement, so it is difficult for non-specialists to measure and the measurement efficiency is poor. is there.
Further, the impact detection device 80 disclosed in Patent Document 2 described above can detect impacts in multiaxial directions, that is, triaxial directions, and includes a light emitter 84 and a light receiver. The light receiver blocks the light emitted from the light emitter 84 due to the impact generated on the plate 83, and sends a signal corresponding to the light to the microcomputer. Thus, even the impact detection device 80 disclosed in Patent Document 2 performs measurement by taking out an electrical signal. Therefore, the same problem as the accelerometer disclosed in Patent Document 1 described above occurs.
Furthermore, in the case of using a pressure filter used as an accelerometer capable of relatively easy measurement, since it uses a chemical reaction, there is a problem that it is restricted by the usage environment such as temperature and humidity. Limited to measurement in only one axis direction.
(Object of invention)

  Therefore, the present invention improves the disadvantages of the conventional example, does not require a complicated measurement system such as a scientific reaction or an electric circuit, and has a simple configuration without being restricted by the use environment. It is an object of the present invention to provide an accelerometer capable of measuring the acceleration of the lens very simply.

  In order to achieve the above object, an accelerometer according to the present invention has a first plate-like member and a second plate-like member arranged to face each other, and at least one of these first and second plate-like members. Is a sealed box formed of a transparent member, and is disposed near one end surface of the first and second plate members inside the box and fixed to the first and second plate members. A central body and a base end portion fixed to the central body and a distal end portion extending outward from the central body in the centrifugal direction, and arranged radially from the center of the central body, each being only in the centrifugal direction A plurality of elastic bodies that can be displaced, and weights provided at the tip portions of these elastic bodies, respectively, are formed on the outer surface of the plate-like member formed of the transparent member. A plurality of scale parts that are concentric with respect to the center are formed. The box body has an acceleration comprised in the displacement direction and the impact value of the elastic body and the weight member occurs when an impact and measurable structure (claim 1).

Therefore, according to this, since the central body is provided with a plurality of elastic bodies and weights radially, when the box body receives an impact due to dropping or the like, the impact direction of the plurality of elastic bodies and weight bodies The elastic body and the weight body along the axis move the most and are displaced. By observing the displacement of the elastic body and the weight body, the displacement direction of the acceleration can be measured.
In addition, since a plurality of concentric graduations are formed from the center of the center body on the surface of the transparent plate member, the elastic body and the weight body are moved by the impact and displaced, that is, the impact value. Can be measured.
As a result, a complex measurement system such as a scientific reaction or an electric circuit is not required, and acceleration in a multi-axis direction can be measured very simply with a simple configuration without being limited by the use environment.

  Further, the box body described above is formed in a rectangular thin rectangular parallelepiped, and two of the plurality of elastic bodies and weight bodies are substantially along each other along the long side direction of the rectangle and sandwiching the central body. It is good also as a structure arrange | positioned so that it may be located in a line on a 180 degree line, and the remaining elastic bodies and weights are arrange | positioned at equal intervals between 180 degree lines (Claim 2).

  In this way, since the plurality of elastic bodies and weights are equally arranged within the 180-degree line, the displacement direction and impact value that are the elements of acceleration, regardless of which direction the box receives impact from. Can be reliably measured.

  Furthermore, the accelerometer according to the present invention comprises a plurality of elastic bodies formed of springs.

For this reason, according to this, the acceleration direction and the acceleration value can be reliably measured by using the spring in which the spring constant is set so as to correspond to the weight of the weight body and the expected impact value.
In addition, the spring is easy to obtain and easy to install.

  Further, a weight number that continues from the weight body on one side to the weight body on the other side is arranged on the substantially 180-degree line on the surface of the plurality of weight bodies on the plate-like member side formed of the transparent member. The number of weights consecutive from the weight body on one side of the elastic body tip arranged so as to be aligned on a substantially 180 degree line is written on the surface of the plate-shaped member side formed by the transparent member of a plurality of weight bodies. It is good also as a structure (Claim 4).

  If it does in this way, a weight number will be written in each of a some weight body, and this weight number can be visually observed from the surface of the plate-shaped member formed with the transparent member. Therefore, when the box body receives an impact and the elastic body and the weight body are displaced in the impact direction, the weight body with the largest displacement amount can be known by the number. As a result, acceleration and acceleration values can be reliably measured.

  Further, an adhesive body capable of attaching the box to an arbitrary position of the measured body on the outer surface of the plate-like member on which the scale portion is not formed among the first and second plate-like members described above. It is good also as a structure which provided (Claim 5).

  Thereby, since the adhesive body is provided in the outer surface of the plate-shaped member in which the scale part is not formed, an accelerometer can be attached to arbitrary measured bodies. As a result, it is possible to effectively measure the acceleration of any object to be measured.

  Moreover, it is good also as a structure which made the scale space | interval of the scale part mentioned above 1 mm.

  If it does in this way, while being able to measure the impact value which comprises acceleration with high precision, if a scale space | interval is 1 mm, it can also confirm easily visually.

  Further, a guide groove for guiding the weight body may be formed on a surface of the plate-shaped member of the first and second plate-shaped members, on which the scale portion is not formed, facing the weight body. (Claim 7).

  Thereby, since the weight body is guided by the guide groove, the strength of the elastic body may not be such that the elastic body attaches the weight body and the weight body does not hang down in a horizontal state. As a result, since the strength of the elastic body may be small, even when the box receives a small impact, the impact can be sensed, and the acceleration and acceleration values can be measured with high accuracy.

  Since the present invention is configured and functions as described above, it does not require a complicated measurement system such as a scientific reaction or an electric circuit, and has a simple configuration without being restricted by the use environment. The axial acceleration can be measured very simply.

Below, with reference to FIGS. 1-5, 1st Embodiment of the accelerometer of this invention is described.
FIG. 1 is a front view of the accelerometer 1 and FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.

  As shown in FIGS. 1 and 2, the accelerometer 1 includes a sealed box 10. The box 10 has a rectangular first plate member 11 and a second plate member 12 that are opposed to each other, and a side surface is provided on the entire outer periphery of the first plate member 11 and the second plate member 12. A member 13 is provided, whereby the thin box 10 is formed.

  At least one of the first plate member 11 and the second plate member 12, in the present embodiment, the first plate member 11 is formed of a transparent member such as plastic. On the other hand, the 2nd plate-shaped member 12 is formed with non-transparent members, such as a gray color, for example. Translucent is also included in transparency.

  Inside the box body 10, the first plate-like member 11 and the second plate-like member 12 have a dimension substantially equal to the width dimension of the side member 13 at one end side in the short side direction and substantially at the center in the long side direction. A cylindrical center body 15 having a thickness of 1 mm is disposed. For example, an adhesive is applied to both end faces of the center body 15, and the center body 15 is sandwiched between the first plate member 11 and the second plate member 12, and is fixed to the first plate member 11 by the fixed mandrel 16. By being connected to the second plate-like member 12, the plate-like members 11 and 12 are fixed.

A plurality of springs 20, which are seven elastic bodies in the embodiment, are provided on the outer peripheral surface of the center body 15. Each of these springs 20 is arranged at an equal angle α1 within a line of an angle α passing through the center of the central body 15. In the embodiment, the angle α is set to 180 degrees, and the uniform angle α1 is set to 30 degrees.
For example, a compression spring is preferably used as the spring 20.

Each spring 20 is fixed by, for example, embedding its base end in the outer peripheral surface of the central body 15, and each distal end extends outward in the centrifugal direction to the vicinity of the end of the box 10.
Accordingly, each spring 20 can be expanded and contracted only in the centrifugal direction.

A weight body 25 is provided at the tip of each spring 20. These weights 25 are formed in a columnar shape having an outer diameter smaller than the interval between the first plate member 11 and the second plate member 12, and move within the interval between the plate members 11, 12. To be displaced.
For example, a weight body of about several tens of grams to 100 grams is used. However, it is not limited to these weights.

  Since the weight body 25 has the above-described weight, the spring 20 equipped with the weight body 25 needs to have a strength capable of being displaced in the centrifugal direction in that state. That is, the spring 20 equipped with the weight body 25 has a spring constant set to such a strength that the weight body 25 does not hang down even when the spring 20 is in a horizontal state.

As shown in FIG. 1, the weight number is marked on the outer surface of the weight body 25 on the first plate-like member 11 side as described above. That is, one of the weights 25 arranged on the 180-degree line, for example, the left weight 25 is the number 1 weight 25A, and the number 1 is sequentially numbered sequentially from the number 1 weight 25A to the other side in the counterclockwise direction. Two spindles 25B... No. 7 spindles 25G are marked by painting or the like.
Therefore, when the displacement is most in the centrifugal direction, that is, when the peak is reached, it is possible to surely know which number of the weights 25A and the like the weights 25A, thereby clearly confirming the directionality of acceleration. It becomes.

On the surface of the first plate-like member 11, a scale portion 30 for detecting the displacement amount of the weight body 25, that is, the impact value is formed. That is, the graduation portion 30 includes a first graduation 30A, a second graduation 30B, and a third graduation 30C that are focused on the center of the central body 15 and are concentric. The graduations 30A, 30B, The dimension between 30C is 1 mm, for example.
However, the dimension between these scales 30A, 30B, and 30C is not limited to 1 mm, and may be more or less.
In FIG. 1 and the like, the intervals between the scales 30A, 30B, and 30C are displayed larger than the actual dimensions as compared with the weight body 25 and the like. is there.

Further, an adhesive 35 can be attached to the surface of the second plate-like member 12 as shown in FIG. For example, a double-sided tape is used as the adhesive body 35.
Such an adhesive 35 is attached to the outer surface of the second plate-like member 12 of the accelerometer 1 after peeling off one release paper constituting the double-sided tape. At this time, the corresponding portion of the adhesive body 35 may be cut out so as to avoid the outer surface portion of the fixed mandrel 16 connecting the first plate member 11 and the second plate member 12.

Next, a method for using the accelerometer 1 configured as described above will be described.
As shown in FIG. 3, for example, when performing a drop test of the measurement object 40, the other release paper is peeled off from the double-sided tape of the adhesive 35 attached to the outer surface of the second plate-like member 12 of the accelerometer 1. Then, the accelerometer 1 is attached by being attached to the upper right side of the measured object 40, for example.
At this time, the accelerometer 1 is mounted in a state where the line connecting the number 1 spindle 25A and the number 7 spindle 25G of the accelerometer 1, that is, the 180-degree line is orthogonal to the falling direction of the measurement target 40. .

Thereafter, a drop test is performed.
As shown in FIG. 4, the substantially rectangular parallelepiped-shaped object to be measured 40 has the one end 40 </ b> A as a drop point and falls vertically with an inclination of θ degrees and collides with the floor 50 as indicated by an arrow A. At that time, as shown by an arrow P, an acceleration in the direction opposite to the arrow A is generated in the measured object 40 due to the impact of the collision.

At this time, the respective weights 25A to 25G of the accelerometer 1 are displaced in the direction along the falling direction. The state is shown in FIG.
As described above, since each spring 20 is displaced only in the centrifugal direction, the number 5 weight body 25E along the falling direction A moves to the outermost side in the centrifugal direction and is displaced to show a peak. After the tip of 25E stops instantaneously, for example, at a point beyond the third scale 30C, the weight body 25E returns to the initial position due to the spring property of the spring 20. And since the point which exceeded the 3rd scale 30C becomes an acceleration value, the displacement direction and impact value of acceleration can be measured by visually checking the point.

  Here, the impact value of the acceleration is obtained by the weight of the number 3 spindle 25C and the spring 20. That is, when the weight 25C is, for example, 50 g and the position of the third scale 30C indicates 250 g, the weight 25C receives an impact and exceeds the position of the third scale 30C as described above. At this time, the impact value is five times the weight of the weight 25C.

  As described above, the number 4 weight body 25D and the number 6 weight body 25F that are adjacent to the number 5 weight body 25E that has moved most along the falling direction are located at positions 30 degrees apart. Therefore, the distance from the center of the center body 15 to the extended tip of the number 5 weight body 25E has a relationship of 2: √3 with respect to the weights 25D and 25F, and the weight 25D. , 25F is smaller than the displacement of the weight body 25E. Therefore, the tips of the weight body 25D and the weight body 25F indicate, for example, a point beyond the second scale 30B.

Further, for example, when the substantially middle point between the number 4 weight body 25D and the number 5 weight body 25E is along the drop direction A, the weight bodies 25D and 25E are similarly moved most in the centrifugal direction. At this time, the ends of the weights 25D and 25E extend to the midpoint of the tip positions of the number 5 weight body 25E, the number 4 weight body 25D and the number 6 weight body 25G, and the ends of the weight bodies 25D and 25E. Shows, for example, the position of the third scale 30C.
Further, the number 3 cylinder 25C located at a position 90 degrees relative to the number 5 cylinder 25E is not displaced, and the number 2 cylinder 25B and the number 1 cylinder located at a position displaced 90 degrees or more relative to the weight 25E. The body 25A is not displaced outward beyond the scale part 30.

  As described above, one or two of the spring 20 and the weight body 25 move along the falling direction A, so that the displacement direction can be known by finding the weight body 25A having a large amount of movement. Can do. Further, by looking at the position of the scale 30 indicated by the weight body 25A and the like, the impact value at the peak can be known.

According to the accelerometer 1 having the above configuration, the following effects can be obtained.
(1) When a plurality of springs 20 and weights 25 are provided radially on the central body 15 and the box 10 receives an impact due to dropping or the like, the springs 20 and the weights 25 are aligned along the impact direction. The spring 20 and the weight body 25 move the most and are displaced. By looking at the displacement of the spring 20 and the weight body 25, the direction of acceleration can be measured. As a result, a complex measurement system such as a scientific reaction or an electric circuit is not required, and acceleration in a multi-axis direction can be measured very simply with a simple configuration without being limited by the use environment.

  (2) Since the plurality of springs 20 and the weights 25 are evenly arranged within the 180-degree line, the displacement direction and impact value of the accelerometer 1 can be determined regardless of which direction the box 10 receives impact. It can be measured reliably.

  (3) Since the spring constants of the plurality of springs 20 are set so as to correspond to the weight of the weight 25 and the expected impact value, the acceleration direction and the acceleration value can be reliably measured. In addition, the springs are easy to obtain and install.

  (4) A weight number 25A or the like is written on each of the plurality of weight bodies 25, and the weight number 25A or the like can be visually observed from the surface of the first plate-like member 11 formed of a transparent member. Therefore, when the box body 10 receives an impact and the spring 20 and the weight body 25 are displaced in the impact direction, the weight body 25 having the largest displacement amount can be known by the number. As a result, the displacement direction and impact value can be reliably measured.

  (5) Since the adhesive body 35 is provided on the outer surface of the second plate-like member 12, the accelerometer 1 can be attached to an arbitrary measured body 40. As a result, it is possible to effectively measure the acceleration of any object to be measured 40 as necessary.

  (6) Since the interval between the first scale 30A, the second scale 30B, and the third scale 30C constituting the scale portion 30 is set to 1 mm, the impact value applied to the accelerometer 1 is simple, Compared to the use of an acceleration pickup using a conventional piezoelectric element or the like, the measurement error can be measured within an error of about 5%.

Next, a second embodiment of the accelerometer 1 of the present invention will be described with reference to FIGS.
In this embodiment, substantially the same structure and the same members as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the accelerometer 2 of the second embodiment, the first to seventh weight bodies 45A to 45G constituting the weight body 45 have a rectangular parallelepiped shape, and the weight bodies 45A to 45G can be slid along the guide groove 12A. Is.
That is, concave guide grooves 12A corresponding to the respective weights 45A to 45G are formed on the surface of the second plate member 12 facing the first plate member 11, and along these guide grooves 12A. Each of the weight bodies 45A to 45G slides and moves. As shown in FIG. 6, the guide grooves 12 </ b> A are formed to have a length that exceeds the moving range of the weights 45 </ b> A to 45 </ b> G.

In the accelerometer 2 of the second embodiment, the same operation as that of the first embodiment is obtained, and the same effects as the above (1) to (6) can be obtained, and the following effects are obtained. be able to.
(7) The guide grooves 12A formed in the second plate-like member 12 correspond to the weights 45A to 45G, and the weights 45A to 45G are partially supported by the guide grooves 12A. ing. Therefore, since the respective weights 45A to 45G are guided by the guide groove 12A, the strength of the spring 20, that is, the spring constant, is set so that each weight 45A is in a state where the spring 20 is mounted with the weights 45A to 45G and in the horizontal state. It does not need to be strong enough to prevent ˜45G from dripping. As a result, since the strength of the spring 20 may be small, even when the box 10 receives a small impact, the impact can be sensed, and the displacement direction and the impact value of the acceleration can be measured with high accuracy. .

  (8) Since the guide groove 12A is formed by the concave surface formed in the second plate-like member 12, it does not affect the displacement of the spring 20 or the movement of the weights 45A to 45G.

  The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  For example, in each of the above-described embodiments, the weights constituting the weight bodies 25 and 45 are composed of 7 pieces of the number 1 weight body 25A to the number 7 weight body 25G and the number 1 weight body 45A to the number 7 weight body 45G. Not limited to this. Depending on the size and weight of the weights 25 and 45, the size of the accelerometers 1 and 2, etc., seven or more may be provided, or may be seven or less.

  In the second embodiment, the guide groove 12A is a concave groove that guides the side surfaces in the width direction of the weights 45A to 45G. However, the guide groove 12A is formed on the surface of the weights 45A to 45G facing the second plate-like member 12. A convex portion (not shown) is formed, and a concave groove (not shown) corresponding to the convex portion is formed in the second plate-like member 12, and the convex portion is slidable in the concave groove. You may make it match.

  Furthermore, in each of the above embodiments, the accelerometer 1 is used as a drop test in which the accelerometer 1 is mounted on the measurement object 40 and then the measurement object 40 is dropped to detect acceleration. Not limited to. The accelerometer 1 may be mounted on the measurement object 40, and the acceleration may be detected by applying an impact from above the measurement object 40.

  Moreover, in each said embodiment, although only the 1st plate-shaped member 11 which comprises the box 10 of the accelerometer 1 was made into the transparent member, it is not restricted to this. The second plate member 12 constituting the box 10 may also be formed of a transparent member. If it does in this way, since the 1st plate-shaped member 11 and the 2nd plate-shaped member 12 can be formed with the same material, there exists an advantage that manufacture and procurement of a member are easy.

  The accelerometer of the present invention can be used when, for example, a drop test of a packaged product or an acceleration applied to a precision instrument is simply detected.

1 is an overall front view showing a first embodiment of an accelerometer of the present invention. It is a longitudinal cross-sectional view along the II-II line of FIG. It is a whole front view which shows the state which mounted | wore the to-be-measured body with the accelerometer of the said 1st Embodiment. It is a whole front view which shows the state which carried out the drop test of the to-be-measured object equipped with the accelerometer of the said embodiment. It is a whole front view which shows the detail of the accelerometer in the state of FIG. It is a whole front view which shows 2nd Embodiment of the accelerometer of this invention. It is a longitudinal cross-sectional view along the XII-XII line of FIG. It is a longitudinal cross-sectional view which shows an example of the conventional impact detection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Accelerometer 10 Box 11 First plate-like member 12 Second plate-like member 14 Central body 20 Elastic body 25, 45 Weight body 25A-25G Number 1 weight-Number 7 weight 45A-45G Number 1 weight-Number 7 Weight 30 Scale part 30A First scale 30B Second scale 30C Third scale 40 Object to be measured

Claims (7)

While having the 1st plate-like member and the 2nd plate-like member which are arranged facing, at least any one of these 1st and 2nd plate-like members, and the sealed box body formed with a transparent member,
A central body disposed near one end surface of the first and second plate-like members and fixed to the first and second plate-like members inside the box;
The base end is fixed to the central body and the distal end extends outward in the centrifugal direction from the central body, and is arranged radially from the center of the central body, and each can be displaced only in the centrifugal direction. A plurality of elastic bodies,
Each of which is provided with a weight provided at the tip of each elastic body,
A plurality of scale parts concentric with the center of the central body are formed on the outer surface of the plate-like member formed of the transparent member, and when the box body is impacted by these scale parts, An accelerometer characterized in that it can measure acceleration generated by the displacement direction and impact value of the elastic body and weight body. The accelerometer according to claim 1,
The box is formed into a rectangular thin rectangular parallelepiped, and two of the plurality of elastic bodies and weights are along the long side direction of the rectangle and are substantially 180 degrees apart from each other with the central body interposed therebetween. An accelerometer, wherein the remaining elastic bodies and weights are arranged at regular intervals between 180 degree lines. The accelerometer according to claim 1 or 2,
An accelerometer, wherein the plurality of elastic bodies are constituted by springs. The accelerometer according to any one of claims 1 to 3,
On the surface of the plurality of weights on the side of the plate-like member formed of the transparent member, the weight number continuous from the weight body on one side to the weight body on the other side arranged on the approximately 180 degree line is described. Accelerometer characterized by. The accelerometer according to any one of claims 1 to 4,
An adhesive body capable of attaching the box to an arbitrary position of the body to be measured is provided on the outer surface of the plate-like member on which the scale portion is not formed among the first and second plate-like members. Accelerometer characterized by. The accelerometer according to any one of claims 1 to 5,
An accelerometer characterized in that the scale interval of the scale part is 1 mm. The accelerometer according to any one of claims 1 to 6,
A guide groove that guides the weight body is formed on a surface of the first and second plate-shaped members, on which the scale portion is not formed, on the surface facing the weight body. Accelerometer.

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