JPH09304429A - Acceleration sensor and acceleration sensor equipment using the acceleration sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sensitivity of a switch and increase the measurement precision, by installing a hard ball accommodating part having a bottom part on which a push button of the switch is exposed and a ceiling part which slants from the central part toward the skirt side and has a recessed part in the central part. SOLUTION: A mechanical key switch 20 has a dome-shaped spring part member 26 accommodated in a housing 21, and a push button 27 is arranged above the spring part member 26. A hard ball 32 is accommodated in a hard ball accommodating part 31. The lower part of the hard ball 32 is mounted on a push button 27, and the upper part of the hard ball 32 engages with the recessed part 30. When collision (acceleration) of a moving object happens, the hard ball 32 rushes out of the recessed part 30, moves to skirt 29A side of a ceiling part 29, and presses the push button 27. Thereby the top part of the spring part member 26 is pushed by the protruding part 27B of the push button 27, and the spring part member 26 is inverted. The top part of the spring part member 26 comes into contact with a contact part 22, and turns to the state of switch-on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acceleration sensor provided in a moving body such as a vehicle for detecting the acceleration of the moving body, and more particularly to an acceleration sensor using a mechanical key switch and a hard ball and the acceleration. The present invention relates to an acceleration sensor device using a sensor.

[0002]

2. Description of the Related Art As a conventional acceleration sensor of this type, as shown in FIG. 11, one fixing piece 52 connected to one terminal 51 and another fixing piece 54 connected to the other terminal 53 are provided in a case 50. Are positioned above and below, a recess 55 is formed in the other fixed piece 54, and a hard ball 56 is placed in this recess 55.
The magnet 57 is fixed to the bottom of the case 50,
Magnetically attracts the hard sphere 56 and places it in the recess 55,
There is one in which this state is set to neutral and the switch is turned off.

The acceleration sensor configured as described above is provided on a moving body such as a vehicle, and the moving body collides (accelerates).
In this case, the hard sphere 56 pops out of the recess 55, and one fixed piece 52 and the other fixed piece 5 are shown as shown by phantom lines.
4 and by short-circuiting between the one and the other fixing pieces 52 and 54, the switch is turned on.

[0004]

However, in the above-mentioned conventional acceleration sensor, the hard ball 56 resists the elasticity of the one and the other fixing pieces 52 and 54, and between the one and the other fixing pieces 52 and 54. However, there is no force (contact follow) to push the hard sphere 56 at the time of contact with one and the other fixing pieces 52, 54 of the hard sphere 56, and the hard sphere 56 bounces back. There was a problem that the resistance became large, the detection duration was short, and the sensitivity was poor. Further, since the detection duration is short, the other party receiving the output determines whether the received signal is a "detection signal" or "noise".
There was a problem that the distinction was difficult.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide an acceleration sensor which has good switch sensitivity and can detect acceleration accurately. Especially.

A second object of the present invention is to provide an acceleration sensor device capable of mounting the acceleration sensor on a moving body and connecting the acceleration sensor to other devices via a connector section. Especially.

[0007]

In order to achieve the above first object, the acceleration sensor according to the invention of claim 1 is
A switch that is turned on by pushing the push button, a hard ball storage portion having a bottom portion where the push button of the switch is exposed and a ceiling portion that is inclined from the central portion to the hem side and has a concave portion in the central portion, A hard ball that is housed in a hard ball housing part, is placed on the push button, and is removably engaged with the recess.

With this configuration, when the acceleration sensor is provided on a moving body such as a vehicle and the moving body collides (accelerates), the hard ball jumps out of the recess and moves to the hem side of the ceiling to push the push button. The contact is followed so that the ball does not bounce so that the switch is in the switch-on state when pushed in, the contact resistance of the ball is small, and the sensitivity is good so that the ball immediately reacts.

In order to achieve the above-mentioned first object, the acceleration sensor according to the invention of claim 2 is the acceleration sensor according to claim 1, wherein the operation amount adjustment for changing the operation amount in the neutral position of the switch by the hard ball is performed. Equipped with means.

With this configuration, when the acceleration sensor is provided on a moving body such as a vehicle and the moving body collides (accelerates), the hard ball jumps out of the recess and moves to the hem side of the ceiling to push the push button. Just like pushing the switch into the switch-on state, there is contact follow and there is no bounce of the hard sphere, the contact resistance of the hard sphere is small, the sensitivity is good so that the hard sphere reacts immediately, and it operates The amount adjusting means can easily change the operation amount of the switch by the hard ball in the neutral state. Therefore,
If the actuation amount is increased, it becomes difficult to react to the acceleration, and conversely, if the actuation amount is decreased (close to zero), the reaction becomes easy.

In order to achieve the above first object, the acceleration sensor according to the invention of claim 3 is the acceleration sensor according to claim 2.
In the acceleration sensor described above, the hard sphere storage portion is configured by providing a case on a sensor base to which the switch is attached, and the actuation amount adjusting means is a male screw portion on a peripheral portion of the sensor base, and a base portion of the case. A female screw portion is formed and the female screw portion is screwed into the male screw portion.

With this structure, not only the same effects as those of the second aspect can be achieved, but also the case is rotated to move the female screw portion of the base of the case with respect to the male screw portion of the peripheral portion of the sensor base. By finely adjusting by screw feeding, the operation amount (pushing amount) of the switch means by the hard ball in the neutral state can be easily changed. Therefore, if the actuation amount is increased, it becomes difficult to react to the acceleration, and conversely, if the actuation amount is decreased (close to zero), the response becomes easy.

In order to achieve the above first object, the acceleration sensor according to the invention of claim 4 is the acceleration sensor according to claim 2.
In the acceleration sensor described above, changing the size of the hard ball is the operation amount adjusting means for changing the operation amount of the switch means by the hard ball.

With this configuration, not only the same operation as that of the second aspect can be achieved, but also the size of the hard ball is changed to easily change the operation amount (pushing amount) of the switch means by the hard ball in the neutral state. be able to. Therefore, if the actuation amount is increased, it becomes difficult to react to the acceleration, and conversely, if the actuation amount is decreased (close to zero), the response becomes easy.

In order to achieve the above first object, the acceleration sensor according to the invention of claim 5 is the acceleration sensor according to claim 1.
The acceleration sensor described above further includes a hard ball holding means for temporarily holding the hard ball when acceleration is detected.

With this configuration, when the acceleration sensor is provided on a moving body such as a vehicle and the moving body is collided (accelerated), the hard ball jumps out of the recess and moves to the hem side of the ceiling to push the push button. The contact resistance of the hard sphere is small so that the switch is turned on when the switch is turned on, the sensitivity is good so that the hard sphere reacts immediately, and the hard sphere is held temporarily during acceleration detection for a long time. When the other party receiving the output determines whether the received signal is the “detection signal” or the “noise”, the other party receiving the output can easily make the determination.

In order to achieve the above first object, the acceleration sensor according to the invention of claim 6 is the acceleration sensor according to claim 5.
In the acceleration sensor described in the above, the hard sphere accommodating portion is configured by providing a case to a sensor base to which the switch is attached, and the hard sphere holding means has an outer wall facing the hard sphere with the case interposed therebetween and the hard sphere. Also, at least one of the outer walls is made of a magnetic material, and the hard spheres are temporarily held by magnetism when acceleration is detected.

With such a construction, not only the same operation as that of the fifth aspect of the invention can be achieved, but the hard spheres are temporarily held by magnetism when acceleration is detected. For this reason, by making it output for a long time, when the other party receiving the output determines whether the received signal is a "detection signal" or "noise", it becomes easy to make the determination. .

In order to achieve the above-mentioned second object, the acceleration sensor device according to the invention of claim 7 has a switch for turning on the acceleration sensor at least by pushing a push button, and the switch of the switch. A hard ball storage part having a bottom part where the push button is exposed and a ceiling part inclined from the center part to the hem side to the hem side and having a recess part in the center part, and the recess part which is stored in the hard ball storage part and is mounted on the push button. The acceleration sensor is housed and fixed in a device body having a mounting portion, and a connector portion to which a switch of the acceleration sensor is connected is provided in the device body. It is characterized by

With this configuration, when the acceleration sensor is provided on a moving body such as a vehicle and the moving body is collided (accelerated), the hard ball jumps out of the recess and moves to the hem side of the ceiling to push the push button. The contact resistance of the hard sphere is small so that the switch is turned on when the switch is turned on, and the sensitivity is improved so that the hard sphere reacts instantly, and the attachment of the acceleration sensor to the moving body and the acceleration sensor Connection with other devices can be performed via the connector unit.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of an embodiment 1 of an acceleration sensor according to the present invention, FIG. 2 is a longitudinal sectional view of a mechanical key switch of the acceleration sensor, and FIG. It is a longitudinal cross-sectional view of the same acceleration sensor having an amount adjusting means.

The acceleration sensor 3 has a sensor base 19 as shown in FIG.
A mechanical key switch 20, which is a switch, is attached to the central portion of the. As shown in FIG. 2, the mechanical key switch 20 has a housing 21 having an opening 21A on the upper surface side, and the bottom of the housing 21 has a first contact portion 22 at the center thereof. This first
The second contact portion 23 is disposed on the left and right sides of the contact portion 22 of the first contact portion 22, and the first contact portion 22 is connected to the pair of terminals 24 protruding to the outside of the bottom of the housing 21. The portion 23 is connected to a pair of other terminals 25 protruding outside the bottom of the housing 21. A dome-shaped spring member 26 is housed inside the housing 21, and the peripheral edge of the spring member 26 is in contact with the second contact portion 23. A push button 27 is arranged above the spring member 26, and the push button 27 has a peripheral edge portion 27.
A is a lid 21B provided in the opening 21A of the housing 21.
The push button 27
The projecting portion 27B is in contact with the top of the spring member 26.

A case 28 having a hollow cylindrical shape whose upper end is closed is fixed to the sensor base 19, and a ceiling 29, which is a closed wall surface of the case 28, slightly extends from the central portion to the hem side 29A. It has an inclined conical shape, and a conical recess 30 is formed in the center of the inner surface of the ceiling portion 29. The space inside the case 28 serves as a hard ball storage portion 31. A fixing pin 36 is provided on the base of the case 28 so as to project therefrom.

The hard balls 32 are stored in the hard ball storage portion 31.
Is stored, and the lower part of this hard ball 32 is
It is mounted on the push button 27 of the key switch 20, and the upper part of the hard ball 32 is fitted in the recess 30. This state is neutral, and the mechanical key switch 20 is off.

When the acceleration sensor 3 configured as described above is provided on a moving body such as a vehicle, and the moving body collides (accelerates), the hard sphere 32 jumps out of the concave portion 30 and the skirt of the ceiling portion 29. Move to the 29A side and push in the push button 27. For this reason, the protrusion 27B of the push button 27 pushes the top of the spring member 26, so that the spring member 2
6 is reversed so that the top of the spring member 26 has the first contact portion 22.
To switch on.

With this configuration, when the acceleration sensor 3 is provided on a moving body such as a vehicle and the moving body collides (accelerates), the hard ball 32 jumps out of the recess 30 and the ceiling portion 29.
So that the mechanical key switch 20 is switched on so that the mechanical ball switch 20 is in the switch-on state and there is no contact rebound of the hard ball 32, and the contact resistance of the hard ball 32 is small. , Hard ball 32
The sensitivity is improved so that the will react immediately.

In the acceleration sensor 3, when the dimension A shown in FIG. 1 is changed, the pushing amount B of the push button 27 of the mechanical switch 20 is changed at the neutral position. It becomes difficult to react, and when the pushing amount B is reduced, it becomes easy to react to the acceleration.

In the acceleration sensor 3, the dimension A is changed, that is, as fine adjustment means, as shown in FIG. 3, the peripheral portion of the sensor base 19 is a male screw portion 37, and the female screw portion 38 is formed on the base of the case 28. Then, this female screw part 3
The sensor base 1 is formed by screwing 8 into the male screw portion 37.
When the case 28 is attached to the case 9 and the dimension A is changed, the case 28 is rotated and fine adjustment is performed by screw feeding.

That is, the case 28 is rotated so that the case 2 is attached to the male screw portion 37 on the peripheral portion of the sensor base 19.
By moving the female screw portion 38 at the base of 8 and finely adjusting by screw feeding, the pushing amount B of the push button 27 of the mechanical key switch 20 by the hard ball 32 in the neutral state can be easily changed. Therefore, when the pushing amount (actuation amount) B is increased, it becomes difficult to react to the acceleration, and conversely, when the actuation amount is reduced (close to zero), the reaction becomes easy.

As another method of changing the dimension A in the acceleration sensor 3, by changing the size of the hard ball 32 as shown by the dotted line in FIG. 4, the push button 27 of the mechanical key switch 20 can be changed. The pushing amount B may be changed. When the pushing amount B is increased, it becomes difficult to react to the acceleration, and when the pushing amount B is decreased, the response to the acceleration is facilitated. Further, in this case, the screw structure is not necessary, which simplifies the structure.

When the acceleration sensor 3 configured as described above is actually used, as shown in FIG. 5, the acceleration sensor 3 is built in the case 1 provided with the mounting bracket 40.

That is, the case 1 is provided with a case body 2 having an upper surface portion 2A, front and rear surface portions 2B and 2C, left and right surface portions 2D and 2E, and a lower surface portion (base end surface portion) thereof being opened. The upper part of the case body 2 is a cover mounting part 3, and a connector part 4 is provided on the left side of the front surface of the cover mounting part 3.

That is, the connector portion 4 is provided on the left side of the cover mounting portion 3 with a mating connector fitting portion 5 formed integrally with the case 1 from the front surface portion 3A of the cover mounting portion 3 toward the rear. This mating connector fitting part 5
The contact terminals 6 and 7 are fixed to the inner end wall portion 5A by insert molding so as to project forward. Then, the upper surface portion 2A of the case 1, that is, the cover mounting portion 3
Band-shaped conductors 8 and 9 connected to the contact terminals 6 and 7 are attached to the upper surface of the by means of insert molding.

A standing wall portion 10 is formed inside the case 1 so as to be shifted to the left side. The standing wall portion 10 reaches the lower surface portion 5B of the mating connector fitting portion 5, and the lower surface portion is formed. An opening 11 is formed in 5B, and a front portion of the opening 11 is raised to form a lance locking portion 12. A plurality of claw-shaped portions 1 are provided at the lower edge of the standing wall portion 10.
A lance locking portion 14 having 4A is provided.

The inside of the case 1 is an acceleration sensor housing 33, and the acceleration sensor housing 33 is formed.
An acceleration sensor mounting hole 34 and a terminal through hole 35 are provided in the ceiling portion of the above, that is, the upper surface portion 2A of the case 1. Further, a pair of cover locking projections 15 is provided on each of the left and right surface portions 3B and 3C of the cover mounting portion 3, and a mounting member engaging portion 16 is formed on the lower portion of the case 1. The mounting member engaging portion 16 includes the left and right surface portions 2D of the case 1,
The lower part of 2E is extended downward, and an engaging groove 18 is formed on the inner surface of the extension 17 along the front-rear direction.

The acceleration sensor 3 constructed as described above is housed in the acceleration sensor housing portion 33 of the case 1, and the fixing pin portion 36 at the base of the case 28 is
It is inserted and locked in the acceleration sensor mounting hole 34 in the ceiling of the acceleration sensor housing 33, and the terminal 2 of the acceleration sensor 3
The terminals 4 and 25 penetrate the terminal through hole 35 so that one terminal 24 is connected to the conductor 8 and the other terminal 25 is connected to the conductor 9.

Further, the mounting member engaging portion 16 is provided with a mounting member 40 which is slidably engaged with the engaging groove 18 at its left and right edges, and is formed on the mounting member 40. The lance portion 40A is the lance locking portion 1 of the lower edge portion 10 of the standing wall portion 10.
4 Further, the cover 4 is attached to the cover mounting portion 3.
1 is covered, and the locking holes 42 on the left and right of this cover 41
The cover locking projection 15 is locked to the.

With this configuration, when the acceleration sensor 3 is provided on a moving body such as a vehicle and the moving body collides (accelerates), the hard ball 32 jumps out of the concave portion 30 and the ceiling portion 29.
Move to the hem side 29A of the mechanical key switch 20
The push button 27 of No. 3 is pushed in so that the mechanical key switch 20 is switched on so that there is contact follow and there is no rebound of the hard ball 32.
The contact resistance of 2 is small, the sensitivity is improved so that the hard sphere 32 reacts immediately, and the attachment of the acceleration sensor 3 to the moving body and the connection of the acceleration sensor 3 with other equipment are performed by the connector portion 4. Can be done through.

(Embodiment 2) Embodiment 2 of the acceleration sensor of the present invention is shown in FIGS. FIG. 8 is a vertical sectional view of the acceleration sensor according to the second embodiment of the present invention when it is in a neutral position, and FIG. 9 is a vertical sectional view of the acceleration sensor when a collision is detected.

Generally, in an acceleration sensor that is switched on at neutral, switched off at acceleration detection, and self-restoring after detection, whether the signal received by the other party receiving the output is a "detection signal" or "noise". However, it is required to lengthen the detection continuation time so that the determination can be easily performed.

In the case of the present invention, by adopting a magnetic material for the hard sphere of the acceleration sensor or the outer wall facing the hard sphere with the case sandwiched, it is possible to temporarily hold the hard sphere at the time of detection and output it for a long time. did.

That is, the acceleration sensor 43 in the second embodiment has an outer wall 44 surrounding the case 28 in addition to the structure of the acceleration sensor 3 in the first embodiment.
And has a magnetic function of attracting each other to the hard sphere 32 and the outer wall 44. Therefore, the hard ball 32
Is a magnetic substance, the outer wall 44 is an iron-based metal, the hard sphere 32 is an iron-based metal, the outer wall 44 is a magnetic substance, the hard sphere 32 is a magnetic substance, and the outer wall 44 is a magnetic substance.

The structure of the acceleration sensor 3 is the same as that of the first embodiment described above, and the same reference numerals are given and the description thereof is omitted. Further, the acceleration sensor 4 according to the second embodiment
3 is the connector portion 4 as in the first embodiment described above.
And the case 1 provided with the mounting bracket 40.

Acceleration sensor 43 constructed as described above
Is provided on a moving body such as a vehicle, and when the moving body is collided (accelerated), the hard ball 32 jumps out of the concave portion 30 and moves to the hem 29A side of the ceiling portion 29 to push the push button 27. For this reason, the protrusion 27B of the push button 27 pushes the top of the spring member 26, so that the spring member 2
6 is reversed so that the top of the spring member 26 has the first contact portion 22.
To switch on.

In this case, for example, when the hard sphere 32 is a magnetic body and the outer wall 44 is an iron-based metal, the hard sphere 32 is attracted to the outer wall 44 side, and the hard sphere 32 becomes a case 28 as shown in FIG.
The hard ball 32 is temporarily held by abutting on the inner peripheral surface of the. For this purpose, the switch-on state is maintained for a long time. That is, when the moving body is collided (accelerated) and the impact force G is generated, the key switch of the mechanical key switch 20 in the acceleration sensor 43 having the magnetic function is
FIG. 10 shows a comparison between the ON state A and the switch ON state B of the mechanical key switch 20 in the acceleration sensor to which the magnetic function is not added.

In this way, the hard ball 32 of the acceleration sensor 43 is
Alternatively, by employing a magnetic material for the outer wall 44 facing the hard sphere 32 with the case 28 in between, the hard sphere 32 is temporarily held at the time of detection and is output for a long time. When it is determined whether is a "detection signal" or a "noise", the determination becomes easy.

[0048]

As described above, according to the acceleration sensor of the first aspect of the invention, the switch that is turned on by pushing the push button, the bottom of the switch where the push button is exposed, and the central portion thereof. From the hem side to the hem side, and a hard ball storage part having a ceiling part having a recess formed in the center part, and a hard ball stored in the hard ball storage part and placed on the push button and removably engaged with the recess. As a result, the acceleration sensor is provided on a moving body such as a vehicle, and when the moving body is collided (accelerated), the hard ball jumps out of the concave portion and moves to the hem side of the ceiling portion to push the push button, So that the switch is switched on,
There is contact follow and there is no bounce of the hard sphere, the contact resistance of the hard sphere is small, and the sensitivity is good so that the hard sphere reacts immediately.

According to the acceleration sensor of the second aspect of the present invention, the acceleration sensor according to the first aspect is provided with an operation amount adjusting means for changing the operation amount of the switch by the hard ball in the neutral position. When a sensor is installed in a moving body such as a vehicle and the moving body collides (accelerates), the hard ball jumps out of the recess and moves to the hem side of the ceiling to push the push button, and the switch is turned on. In order to be in a state, there is contact follow, there is no bounce of the hard sphere, the contact resistance of the hard sphere is small, the sensitivity is good so that the hard sphere reacts immediately, and moreover,
The actuation amount adjusting means can easily change the actuation amount of the switch by the hard ball in the neutral state. Therefore, if the actuation amount is increased, it becomes difficult to react to the acceleration, and conversely, if the actuation amount is decreased (close to zero), the response becomes easy.

According to the acceleration sensor of the third aspect of the present invention, in the acceleration sensor of the second aspect, the hard sphere accommodating portion is configured by providing a case on the sensor base to which the switch is attached, and performing the operation. The effect according to claim 2, wherein the amount adjusting means is configured such that a peripheral portion of the sensor base is a male screw portion, a female screw portion is formed on a base portion of the case, and the female screw portion is screwed to the male screw portion. Not only can the same effect be achieved, but by rotating the case, the female screw portion of the base portion of the case is moved with respect to the male screw portion of the peripheral portion of the sensor base, and fine adjustment is performed by screw feeding,
It is possible to easily change the operation amount (pushing amount) of the switch means by the hard ball in the neutral state. Therefore, if the actuation amount is increased, it becomes difficult to react to the acceleration, and conversely, if the actuation amount is decreased (close to zero), the response becomes easy.

According to the acceleration sensor of the fourth aspect of the present invention, in the acceleration sensor of the second aspect, changing the size of the hard sphere changes the operation amount of the switch means by the hard sphere. By using the amount adjusting means, not only the same effect as the effect of claim 2 can be obtained, but also the operation amount (pushing amount) of the switch means by the hard ball in neutral can be easily changed by changing the size of the hard ball. Can be changed. Therefore, if the actuation amount is increased, it becomes difficult to react to the acceleration, and conversely, if the actuation amount is decreased (close to zero), the response becomes easy.

Further, according to the acceleration sensor of the fifth aspect of the present invention, the acceleration sensor of the first aspect is provided with the hard ball holding means for temporarily holding the hard ball when acceleration is detected. It is provided in a moving body such as a vehicle, and when this moving body is collided (accelerated), the hard ball jumps out of the recess and moves to the hem side of the ceiling, pushes the push button, and the switch turns on. Therefore, there is contact follow and there is no bounce of the hard sphere, the contact resistance of the hard sphere is small, the sensitivity becomes good so that the hard sphere reacts immediately, and also the hard sphere is temporarily held during acceleration detection, By making it output for a long time, when the other party receiving the output determines whether the received signal is a "detection signal" or "noise", make it easy to determine That.

According to the acceleration sensor of the sixth aspect of the present invention, in the acceleration sensor of the fifth aspect, the hard sphere storage portion is formed by providing a case on the sensor base to which the switch is attached, and the hard sphere. The holding means has an outer wall facing the hard sphere with the case sandwiched therebetween, and at least one of the hard sphere and the outer wall is made of a magnetic material so that the hard sphere is temporarily held by magnetism when acceleration is detected. By doing so, not only the same effect as that of the fifth aspect of the invention can be achieved, but the hard spheres are temporarily held by magnetism when acceleration is detected. For this reason, by making it output for a long time, when the other party receiving the output determines whether the received signal is a "detection signal" or "noise", it becomes easy to make the determination. .

Further, in the acceleration sensor device according to the invention of claim 7, the acceleration sensor includes at least a switch which is turned on by pushing the push button, a bottom portion of the switch exposed by the push button and a central portion thereof. A hard ball storage part having a ceiling part inclined toward the hem side and having a recess formed in the central part, and a hard ball stored in the hard ball storage part and resting on the push button and removably engaged with the recess part. Then, by accommodating and fixing the acceleration sensor in a device main body having a mounting portion, and by providing the device main body with a connector part to which a switch of the acceleration sensor is connected, the acceleration sensor can be applied to a moving body such as a vehicle. If the moving body is provided with a collision (acceleration), the hard ball jumps out of the recess and moves to the hem side of the ceiling, pushes the push button, and the switch moves. So that the state of the pitch on,
There is contact follow and there is no bounce of the hard sphere, the contact resistance of the hard sphere is small, the sensitivity is good so that the hard sphere reacts instantly, and the attachment of the acceleration sensor to the moving body and other acceleration sensors The connection with the device can be made via the connector part.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an acceleration sensor (Embodiment 1) according to the present invention.

FIG. 2 is a vertical sectional view of a mechanical key switch of the acceleration sensor.

FIG. 3 is a vertical sectional view of the acceleration sensor having an operation amount adjusting unit.

FIG. 4 is a vertical cross-sectional view of the acceleration sensor having another actuation amount adjusting means.

FIG. 5 is a perspective view of an acceleration sensor device according to the present invention in an exploded state.

FIG. 6 is a front view of a case of the acceleration sensor device.

FIG. 7 is a bottom view of the case of the acceleration sensor device.

FIG. 8 is a vertical sectional view of an acceleration sensor (second embodiment) according to the present invention.

FIG. 9 is a vertical cross-sectional view of the same acceleration sensor (second embodiment) in an operating state.

FIG. 10 shows a state in which a mechanical key switch is turned on in an acceleration sensor with a magnetic function and a mechanical state in an acceleration sensor without a magnetic function when a moving body collides (accelerates) and an impact force is generated. It is a comparison diagram with the switch-on state (b) of the key switch.

FIG. 11 is a vertical sectional view of a conventional acceleration sensor.

[Explanation of symbols]

 3 Acceleration Sensor 20 Mechanical Key Switch (Switch) 26 Push Button 29 Ceiling 30 Recess 31 Hard Ball Storage 32 Hard Ball

Claims (7)

[Claims] 1. A hard ball having a switch that is turned on by pushing a push button, and a bottom portion where the push button of the switch is exposed, and a ceiling portion that is inclined from the central portion to the hem side and has a concave portion in the central portion. An acceleration sensor, comprising: a storage part; and a hard ball stored in the hard ball storage part, placed on the push button and removably engaged with the recess. 2. The acceleration sensor according to claim 1, further comprising operation amount adjusting means for changing an operation amount of the switch by the hard ball in a neutral position of the switch. 3. The hard sphere accommodating portion is configured by providing a case on a sensor base to which the switch is attached, and the actuation amount adjusting means uses a male screw portion on a peripheral portion of the sensor base and a female screw on a base portion of the case. The acceleration sensor according to claim 2, wherein a portion is formed and the female screw portion is screwed into the male screw portion. 4. The acceleration sensor according to claim 2, wherein changing the size of the hard ball is the operation amount adjusting means for changing the operation amount of the switch means by the hard ball. 5. The acceleration sensor according to claim 1, further comprising a hard ball holding means for temporarily holding the hard ball when acceleration is detected. 6. The hard sphere storage section is configured by providing a case on a sensor base to which the switch is attached, and the hard sphere holding means has outer walls facing the hard sphere with the case sandwiched between the hard sphere and the hard sphere. The acceleration sensor according to claim 5, wherein at least one of the outer walls is made of a magnetic material, and the hard sphere is temporarily held by magnetism when acceleration is detected. 7. An acceleration sensor, at least a switch that is turned on by pressing a push button, a bottom portion of the switch where the push button is exposed, and an inclination from the central portion to the hem side and a concave portion formed in the central portion. A device having a mounting portion for the acceleration sensor, and a hard ball housing portion having a ceiling portion, and a hard ball housed in the hard ball housing portion, mounted on the push button and removably engaged with the recess. An accelerometer device, characterized in that it is housed and fixed in the main body, and a connector part to which a switch of the accelerometer is connected is provided in the device body.