JPH0564018U - Shock detector - Google Patents

Abstract

(57) [Abstract] [Purpose] With a simple structure, the operating time of the switch member that operates under load due to impact can be extended, the impact can be reliably detected, and the operation time can be easily adjusted with the prescribed impact load. Obtain the actuation of a long switch member. [Structure] When the bulging portion 18 of the beam plate 16 is pressed and elastically deformed by the load due to the impact, the disc spring 26
The bulging portion 28 is pressed by the deformation of the bulging portion 18 of the beam plate 16 and elastically deforms. And disc spring 26
When the bulging portion 28 is deformed, the membrane switch 24 is pressed to operate. On the other hand, when the load due to the impact disappears, the bulging portion 18 of the beam plate 16 returns and deforms to cause the bulging portion 28 of the disc spring 26 to return and deform. Even after the membrane switch 24 has returned to the deformed shape in which the membrane switch 24 has been activated and is deformed, the bulging portion 28 of the disc spring 26 remains in the membrane switch 2
The deformed shape required for the operation of 4 is maintained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an impact detection device that detects an impact due to a collision or the like in order to operate an airbag device or the like at the time of a collision or the like.

[0002]

[Prior Art]

 Recently, there has been proposed an airbag device for side impact that operates the airbag device even in the case of a side collision of a vehicle.

In order to operate the airbag apparatus for side collision, an impact detection apparatus that detects the impact due to the side collision and outputs the detection signal to the airbag apparatus is required.

As an impact detection device, a membrane switch is provided in the door as a switch member, and an elastically deformable beam plate is provided in opposition to the membrane switch, so that a side collision causes an outer plate of the door. When a load is applied to the beam plate via the beam plate, the beam plate elastically deforms toward the membrane switch and presses the membrane switch, which may cause the membrane switch to operate.

[0005]

[Problems to be solved by the device]

 By the way, in the above-mentioned impact detection device, the beam plate receives the load due to the collision and deforms, and the membrane switch receives the operating pressure required for its operation, and then the load decreases and disappears. The membrane switch continues to operate until it disappears. As shown in FIG. 9, when a load is applied to the beam plate at time T5 due to an impact and the load disappears at time T6, the operating pressure is applied to the membrane switch from time T5 to time T6. The time it takes is the operating time of the membrane switch.

Here, the time for which the load is applied to the beam plate is considerably short, and therefore the operation time of the membrane switch is also short. For example, if the operation time of the membrane switch is short such as less than 10 ms, if the membrane switch is connected in series to the energization circuit of the electric detonator for operating the air bag device, the energization circuit The energization time to the power supply will be shortened, and the energization time required to activate the electric detonator will not be obtained. Further, if the energization time is short, it is not easy to identify whether the energization is due to the membrane switch being actuated by a collision or due to mere electrical noise. To solve these problems, a special control circuit is needed.

On the other hand, when the load applied to the beam plate is small enough not to operate the airbag device, the beam plate is not deformed enough to press the membrane switch to operate it. If the load is so large that it is necessary to activate the airbag device, it is necessary to press the membrane switch to activate the airbag device and activate the airbag device with a predetermined load. Good.

In consideration of the above facts, the present invention has a simple structure, allows a switch member that operates by receiving a load due to a shock to operate for a long time, reliably detects a shock, and easily loads a load due to a predetermined shock. It is an object of the present invention to provide an impact detection device that can operate a switch member that has a long operating time.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a switch member that is operated by being pressed, a first pressure receiving member that is elastically deformed by being pressed by receiving a load due to an impact, the switch member and the first pressure receiving member. The elastic deformation of the first pressure receiving member, which is provided between the first and second members, presses the switch member by being elastically deformed and presses the switch member, and when the load is lost due to the impact, the deformed shape required for the operation of the switch member is And a second pressure receiving member which is maintained for a longer period of time than the deformed shape of the switch of the first pressure receiving member, and is deformed by the return deformation of the first pressure receiving member. It proposes a detection device.

[0010]

[Action]

 With the above configuration, when the first pressure receiving member receives a load due to an impact, the first pressure receiving member is pressed and deformed, and subsequently, due to the deformation of the first pressure receiving member, the second pressure receiving member is pressed and deformed. Due to the deformation of the second pressure receiving member, the switch member is pressed to operate.

Then, when the load due to the impact disappears, the first pressure receiving member deforms by returning and deforming the second pressure receiving member, but the second pressure receiving member necessary for the operation of the switch member. The deformed shape is maintained for a longer time than the deformed shape in which the switch member of the first pressure receiving member is actuated. That is, even after the first pressure receiving member cannot maintain the deformed shape in which the switch member has started to operate, the second pressure receiving member maintains the deformed shape necessary for the operation of the switch member.

As a result, even when the load due to the impact is applied to the first pressure receiving member in a short time, and therefore, the time required to maintain the deformed shape of the switch member of the first pressure receiving member is activated, The operating time of the switch member can be obtained long enough to operate the airbag and the like. In addition, it is possible to easily determine whether the switch member is operating due to the short operating time of the switch member or is there some other electrical noise, and the impact can be detected reliably.

In addition, the first pressure receiving member does not need to be particularly aware of the time for maintaining the deformed shape when the switch member is actuated, and the second pressure receiving member can be operated only by the load due to a predetermined impact. It suffices if the second pressure receiving member can be deformed so as to press the switch member through the other, while the second pressure receiving member does not need to be particularly aware of the load due to a predetermined impact, and only the switch member of the first pressure receiving member can be used. It suffices that the deformed shape required for the operation of the switch member of the second pressure receiving member is maintained for a long time from the deformed shape that has started the operation.

Accordingly, the operation of the switch member having a long operation time can be easily obtained by the load due to the predetermined impact.

[0015]

【Example】

 A first embodiment of the shock detecting device according to the present invention will be described in detail with reference to FIGS. In the drawings, the upper side of the vehicle is indicated by an arrow UP, the outer side in the width direction of the vehicle is indicated by an arrow OUT, and the front side of the vehicle is indicated by FR.

First, as shown in FIGS. 1 and 2, a long plate-shaped lower body 12 is arranged inside the door 10 of the vehicle along the front-rear direction of the vehicle. A beam plate 16 that constitutes a first pressure receiving member is provided on the surface of the outer plate 14 side. A plurality of beam plates 16 are arranged at intervals along the longitudinal direction of the lower body 12, and each beam plate 16 is curved in an arc shape at the center portion in the width direction (vertical direction) to the outside (arrows). A bulging portion 18 bulging toward B) is formed, and both widthwise end portions are in a flange shape and are in contact with the lower body 12. Of the widthwise ends of the beam plate 16, one end (upper end in FIG. 1) 16A is fixed to the lower body 12, but the other end (lower end in FIG. 1) 16B is not fixed. It is in a free state. The bulging portions 18 are arranged so as to be in line contact with the outer plate 14 of the door 10 or have an interval of less than several mm, and when the bulging part 18 receives a load from the outside through the outer plate 14 and is pressed by an impact. As shown in FIG. 3, the free end 16B of the beam plate 16 is laterally displaced along the width direction of the beam plate 16 between the width direction end parts 16A and 16B of the beam plate 16. Is elastically deformed inward so that the

Corresponding to the bulging portion 18 of each beam plate 16, a substrate 20 is fixed to the lower body 12 inside the bulging portion 18. A groove 22 is formed on the surface of the substrate 20 opposite to the lower body 12 in the longitudinal direction of the lower body 12, and a membrane switch 24 constituting a switch member is fixed in the groove 22. When pressed, the membrane switch 24 is turned on to turn on an occupant protection device such as an airbag.

Corresponding to the bulging portion 18 of each beam plate 16, a snap action disc spring 26, which constitutes a second pressure receiving member, is provided on the substrate 20 inside thereof. .. The disc spring 26 has a bulging portion 28 that is bulged in a hemispherical shape in the central portion facing the membrane switch 24, on the side opposite to the membrane switch 24, that is, toward the bulging portion 18 of the beam plate 16. Thus, the bulging portion 28 has a structure in which the membrane switch 24 is positioned inside. The peripheral edge portion of the disc spring 26 is fixed to the substrate 20. When the bulging portion 28 of the disc spring 26 is pressed from the outside by the deformation of the bulging portion 18 of the beam plate 16, as shown in FIG. The membrane switch 24 is pressed to cause buckling. An L-shaped bent terminal piece 25 is connected to the membrane switch 24, and the terminal piece 25 extends from the groove 22 1 of the substrate 20 to the outside. Here, the surface of the membrane switch 24 is made to project from the surface of the substrate 20 toward the bulging portion 28 of the disc spring 26, and when the membrane switch 24 is pressed by the bulging portion 28 of the disc spring 26. The membrane switch 24 is surely operated. On the other hand, the surface of the terminal piece 25 is made lower than the surface of the membrane switch 24 so as to have a step, so that the terminal piece 25 is on the same surface as the surface of the substrate 20 or is retracted from the surface of the substrate 20. When the peripheral edge of 26 is fixed to the substrate 20, the peripheral edge is prevented from interfering with the terminal piece 25. Of course, even when the surface of the terminal piece 25 protrudes from the surface of the substrate 20, the peripheral edge of the disc spring 26 is cut out by the amount of the protrusion so that the peripheral edge of the disc spring 26 becomes the terminal piece 25. There is no interference.

Here, when the load due to the impact is reduced and disappears, the bulged portion 18 of the beam plate 16 returns and deforms in the returning direction of the original shape, so that the bulged portion 28 of the disc spring 26 is also crushed. Although the shape of the bulge 18 of the beam plate 16 is elastically deformed so that the widthwise ends of the beam plate 16 are pushed apart, the bulging portion 18 of the beam plate 16 is bulged. Since the projecting portion 28 is elastically deformed along with the reversal, when the load is lost due to the impact, the bulging portion 28 of the disc spring 26 is caused by the reversing (buckling) of the membrane switch. The deformed shape of the bulging portion 28 of the disc spring 26 required for the operation of the valve 24 is maintained for a longer period of time than the deformed shape of the bulging portion 18 of the beam plate 16 in which the operation of the membrane switch 24 is started. Ru .

Details will be described below. First, in the graph of FIG. 4, the load by which the outer plate 14 of the door 10 presses the bulging portion 18 of the beam plate 16 and the bulging portion 18 of the beam plate 16 that is deformed in the direction facing the membrane switch 24 by the load. As shown in the relationship with the deformation length of the outer plate 14, as the outer plate 14 receives an impact load and the load pressing the bulging part 18 of the outer plate 14 increases, the deforming length of the bulging part 18 increases, At the point A on the deformation length curve, the bulging portion 18 of the beam plate 16 abuts the bulging portion 28 of the disc spring 26, and the load-deformation length curve is from the starting point O point to the point A. , Become straight. Thereafter, the load is the reaction force of the bulging portion 18 of the beam plate 16 (load from point O to point A-load corresponding to the virtual extension line of the deformation length curve) and the bulging portion 28 of the disc spring 26. Of the load-deformation length curve from point A to point B (the load-deformation length curve from point A to point B is The slope is larger than before).

At point B, the bulging portion 28 of the disc spring 26 instantly buckles (reverses), and the load W1 corresponding to point B is point B and the load-deformation length from point O to point A. Point B and point C on a straight line (substantially parallel to the vertical axis that indicates the load) that connects point C on the virtual extension line of the curve (indicated by the dotted line in the figure) immediately below point B Between them and the load corresponding to the maximum point C decreases. If the load decreases to the load corresponding to point C, at point C the membrane switch 24 will be activated and turned on.

When the load is reduced to the load corresponding to the maximum point C, the force by which the bulging portion 18 of the beam plate 16 presses the bulging portion 28 of the disc spring 26 is instantly 0. It is time to become. Normally, if the force by which the bulging portion 18 of the beam plate 16 presses the bulging portion 28 of the disc spring 26 is removed from the bulging portion 28 of the disc spring 26, the bulging portion 28 of the disc spring 26 is in its original shape. Since the bulging portion 18 of the beam plate 16 is not separated from the bulging portion 28 of the disc spring 26, the load does not decrease below the load corresponding to the point C. Further, after the bulging portion 28 of the disc spring 26 buckles at the point B, the load decreases to the load corresponding to the point C, or does not reach that point and the Z between the points B and C is not reached. Whether the load is reduced to a load corresponding to a point, that is, how much the load is reduced depends on the shapes of the bulging portion 18 of the beam plate 16 and the bulging portion 28 of the disc spring 26.

When the load is reduced to the load corresponding to the point C, after the point C, the membrane switch 24 is kept on and the load-deformation curve corresponds to the maximum load W2 due to the impact. Go to point D. Here, it is necessary for the outer plate 14 to deform both the bulged portion 18 of the beam plate 16 and the bulged portion 28 of the disc spring 26 after buckling. Since the rigidity is higher than before buckling, the load-deformation length curve from point C to point D is the load-deformation length from point A to point B due to the increased rigidity. The straight line has a large inclination from the curve (since the reaction force when the bulging portion 28 of the disc spring 26 after buckling is further deformed is not always proportional to the amount of deformation).

If the load decreases only to the load corresponding to the Z point after the bulging portion 28 of the disc spring 26 buckles at the B point, the load-deformation length curve after the Z point Is substantially parallel to the load-deformation length curve from point C to point D, and has a semi-linear shape that passes through point Z.

On the other hand, when the load due to the impact is lost, the deformation length decreases as the load decreases according to the load-deformation length curve between points C and D, but the disc spring Due to its buckling hysteresis, the 26 bulging portions 28 reach the point C (the deformation length corresponding to the point C is substantially equal to the deformation length corresponding to the point B buckled when the load increases). ), The buckling does not return to the original shape, and the buckling instantly returns at point E, which is on the extension line of the load-deformation curve between points C and D, and the load-deformation curve shows points A and B. It reaches the point F, which is located just above the point E on the load curve between and. At the point F, the bulging portion 28 of the disc spring 26 reaches the deformed length L2, which is further deformed due to the deformed length L1 corresponding to the point C, and the membrane switch 24 stops its operation and is turned off.

If the load decreases only to the load corresponding to the Z point after the bulging portion 28 of the disc spring 26 buckles at the B point, then on the straight line connecting the E point and the F point. At point Y between points E and F, point F is reached instantaneously.

Here, the time required to shift from the C point to the E point, that is, the bulging portion 28 of the disc spring 26 changes from the deformation length L1 corresponding to the C point to the deformation length L2 corresponding to the F point. The time it takes to return to and deform is obtained as the hysteresis time.

As described above, when the load due to the impact disappears, the bulging portion 18 of the beam plate 16 returns and deforms in the returning direction, so that the bulging portion 28 of the disc spring 26 returns and deforms in the returning direction. However, the deformed shape of the bulging portion 28 of the disc spring 26 necessary for the operation of the membrane switch 24 (in a state of being inverted and buckled) causes the bulging portion 18 of the beam plate 16 that has started the operation of the membrane switch 24. Even after returning to the deformed shape (L1 corresponding to the point C) and deforming, it is maintained for the hysteresis time.

If the membrane switch 24 is designed to start operating and turn on with a load W1 corresponding to the point B (load W1 is a load at which the membrane switch does not turn on at a load below this), it is caused by an impact. Even if the load W1 is immediately removed at the moment when the load becomes the load W1 corresponding to the point B, the hysteresis time is obtained, and the membrane switch 24 continues to be turned on during the hysteresis time. Therefore, even in such a case, the operation of the membrane switch 24 can be obtained for a long time.

Further, on the lower body 12, a long side impact beam 30 having an annular vertical section is arranged on the side opposite to the outer plate 14 of the door 10 along the front-rear direction of the vehicle. The side impact beam 30 is adapted to reinforce the door 10 against the load received by the door 10 when another vehicle or the like collides with the door 10.

Next, the operation of this embodiment will be described. When another vehicle laterally collides with the door 10, the outer plate 14 of the door 10 is deformed as shown in FIG. It deforms toward the bulging portion 28 of the spring 26. Then, due to the deformation of the bulging portion 18 of the beam plate 16, the bulging portion 28 of the disc spring 26 is pressed and deformed toward the membrane switch 24. Then, due to the deformation of the bulging portion 28 of the disc spring 26, the membrane switch 24 is pressed and turned on.

When the load due to the impact applied to the bulging portion 18 of the beam plate 16 is reduced and disappears, the bulging portion 18 of the beam plate 16 returns and deforms in the returning direction to bulge the disc spring 26. The portion 28 also deforms back, but the deformed shape of the bulging portion 28 of the disc spring 26 necessary for the operation of the membrane switch 24 is the deformed shape in which the bulging portion 18 of the beam plate 16 starts the operation of the membrane switch 24 (see FIG. It is maintained even after returning to L1) corresponding to the point C of 4 and deforming, and the operation time of the membrane switch 24 can be extended by the hysteresis time.

Explaining this over time, as shown in FIG. 5, when a load necessary to start the operation of the membrane switch 24 is applied to the bulging portion 18 of the beam plate 16 due to an impact, at time T1, The membrane switch 24 is pressed by the disc spring 26 to operate and turn on. Even if the bulging portion 18 of the beam plate 16 loses the load due to the impact and the bulging portion 18 of the beam plate 16 cannot maintain the deformed shape in which the membrane switch 24 is activated (time T2). The bulged portion 28 of the disc spring 26 maintains the deformed shape (buckling) required for the operation of the membrane switch 24, and the membrane switch 24 is still pressed and remains in the ON state. After that, at time T4, when the buckling shape of the bulging portion 28 of the disc spring 26 reverts toward the original shape (point F in FIG. 4), thereafter, the membrane switch 24 is turned off.

As a result, the operation time of the membrane switch 24 becomes a time from time T1 to T4, and the membrane switch 24 of the bulging portion 18 of the beam plate 16 is operated from the time T1 when the operation of the membrane switch 24 is started. The time T3 (hysteresis time) from the time T2 to the time T3 can be set longer than the time until the time T2 of returning to the deformed shape and deforming.

For example, when the membrane switch 24 is incorporated in an energizing circuit for actuation of an airbag device or the like, the energization time is obtained correspondingly to the actuation time of the membrane switch 24, and the airbag etc. is actuated. It is sufficient to make it possible to detect a shock without fail by preventing the malfunction due to the inability to distinguish whether the electric current in the circuit is due to the operation of the membrane switch 24 or due to electrical noise. Be done.

Further, the bulging portion 18 of the beam plate 16 does not need to be conscious of the time for maintaining the deformed shape in which the membrane switch 24 is actuated and starts, and the bulging portion 18 of the beam plate 16 is simply caught. If the load due to the impact is small enough not to actuate the airbag device or the like, the load is not deformed enough to press the membrane switch 24 via the bulge portion 28 of the disc spring 26. Is a large one that requires the airbag device or the like to be actuated, it is sufficient if it is a deformation that can press the membrane switch 24 through the bulging portion 28 of the disc spring 26. Then, it is sufficient that the membrane switch 24 can be operated by a load due to a predetermined impact.

On the other hand, the bulging portion 28 of the disc spring 26 has a deformed shape in which the maintenance time of the deformed shape required for the operation of the membrane switch 24 is such that the membrane switch 24 of the bulged portion 18 of the beam plate 16 is actuated. As long as it is longer than the maintenance time, it is not necessary to be aware of the load due to a predetermined impact. That is, the bulging portion 28 of the disc spring 26 does not need to be deformed based on the load due to a predetermined impact.

As a result, the membrane switch 24 having a long operating time can be easily actuated by the load due to the predetermined impact, and the airbag device or the like can be actuated.

Furthermore, there is no need to provide a special control circuit, the structure is simple, the size is small, the assembling work is easy, and the productivity is improved. Next, a second embodiment will be described with reference to FIG. ..

In this embodiment, a cushion material 40 is used as the second pressure receiving member instead of the disc spring 26. The cushion material 40 is fixed to the substrate 20 so as to sandwich the membrane switch 24.

According to this, as shown in FIG. 7, the load that the outer plate 14 presses the bulging portion 18 of the beam plate 16 is shown over time. Then, the outer plate 14 contacts the bulging portion 18 of the beam plate 16. Then, the bulging portion 18 of the beam plate 16 is pressed and deformed by the outer plate 14, and at time T10, the bulging portion 18 of the beam plate 16 contacts the cushion member 40. As a result, the cushion material 40 is subjected to the load W40 and is completely compressed at time T12. After that, the load increases with the lapse of time, and at time T16 when the load becomes W42, the membrane switch 24 is activated and turned on. When the load is lost due to the impact, the load starts to decrease from the maximum load, and at time T18 when the load becomes W42, the operation of the membrane switch 24 is finished and turned off. At this time, due to the characteristic of the cushion material 40, unlike the load-time curve shown by the dotted line in FIG. 7 when this characteristic is not present, the reduction of the load from the maximum load is performed over time, and The deformed shape required for the operation of the membrane switch 24 of the material 40 is the deformed shape in which the membrane switch 24 of the bulging portion 18 of the beam plate 16 is actuated (the membrane switch 24 of the bulging portion 18 of the beam plate 16 is operated. It is maintained even after a time T20 (corresponding to the operation end time of the membrane switch 24 in the case where there is no characteristic of the cushioning material 40) in which the deformation returns to the started shape corresponding to the load W42). Therefore, the operating time (time from T16 to T18) of the membrane switch 24 is lengthened by the time from T20 to T18.

When the load is removed at the start of the operation of the membrane switch 24, the characteristics of the cushion material 40 are not exerted, the operation time of the membrane switch 24 becomes an instantaneous time, and the operation time is maintained for a long time. Although the effect is not sufficiently obtained, normally, the maximum load at the time of collision is considerably large, and if the load for starting the operation of the membrane switch 24 is set to be sufficiently smaller than the maximum load, the The effect of sustaining for a long time is obtained.

Other constitutions and effects are similar to those of the first embodiment. The cushion material 40 may be a sponge-like material or a rubber material. If the material is a rubber material, the cushion material 40 may have a sponge-like shape due to inertia (kinetic) energy (particularly a rubber sheet) caused by its mass. However, due to the dashpot (oil damping) characteristics when air enters the compressed microcells (especially the foam rubber material), it takes time to reduce the load from the maximum load after exceeding the load W2. It is carried out. This property has been confirmed experimentally in both the rubber sheet and the foamed rubber material, but the sponge-like material is particularly excellent.

Further, a third embodiment will be described with reference to FIG. In this embodiment, in addition to providing the cushion member 40 as the second pressure receiving member as in the second embodiment, a space between the bulging portion 18 of the beam plate 16 and the outer plate 14 of the door 10 is further provided. Also, another cushion member 42 is provided.

According to this, when a load due to impact is applied to the outer plate 14, the cushion member 42 is pressed by the outer plate 14, and subsequently the bulging portion 18 of the beam plate 16 and further the cushion member 40 are respectively pressed. When pressed, the membrane switch 24 operates. When the load due to the impact disappears, the cushion member 42 and the outer plate 14 correspond to the cushion member 40 in the second embodiment and the outer plate 14 in the second embodiment. Corresponding to the bulging portion 18 of the beam plate 16 in the above embodiment, there is a relationship between the cushion material 40 and the bulging portion 18 of the beam plate 16 in the embodiment, and the cushion material 42 is the cushion material described in the embodiment. Due to the characteristics of 40, the deformed shape of the bulging portion 18 of the beam plate 16 required for the operation of the membrane switch 24 is returned to the deformed shape for starting the operation of the membrane switch 24 of the outer plate 14 from the time until it is deformed. It is maintained for a long time. Therefore, the deformed shape of the bulging portion 18 of the beam plate 16 is maintained for a longer period of time than that of the outer plate 14 by that amount. In addition to maintaining the deformed shape of the bulged portion 18 of the beam plate 16, the cushion member 40 has a deformed shape longer than that of the bulged portion 18 of the beam plate 16 as in the second embodiment. Since the time is maintained, the operation time of the membrane switch 24 becomes extremely long.

Further, by providing the cushion member 42 between the bulging portion 18 of the beam plate 16 and the outer plate 14 of the side door 10, the fluctuation of the outer plate unnecessarily affects the bulging portion 18 of the beam plate 16. It also has the effect of not affecting.

Other constitutions and effects are similar to those of the second embodiment. Although the respective embodiments have been described above, the present invention is not limited to the above-mentioned embodiments and can be variously modified. For example, in the above-described embodiment, the plate or the cushion material is used as the second pressure receiving member, but the second pressure receiving member is not limited to this, and may be provided between the bulging portion 18 of the beam plate 16 and the membrane switch 24. Alternatively, an oil damper may be provided, but these will maintain the deformed shape required for the operation of the membrane switch 24 for a long time, rather than the deformed shape of the bulging portion 18 of the beam plate 16 that starts the operation of the membrane switch 24. Anything can be used.

Further, in each of the above-described embodiments, the impact detection device provided in the door 10 and detecting the impact in the case of a side collision has been described. However, the impact detection device is not limited to the door 10 and is provided in a body panel other than the door 10. Of course, the present invention is not limited to a side collision, but is of course applicable to other types of shock detectors.

Further, the number of the beam plate 16, and the disc spring 26 and the membrane switch 24 corresponding thereto are not limited, and may be single or plural.

[0050]

[Effect of the device]

 As described above, according to the impact detection device of the present invention, the operation time of the switch member that operates by receiving the load due to the impact can be obtained for a long time, the impact can be reliably detected, and the predetermined impact can be easily performed. The load can be used to operate the switch member for a long operating time, and it does not require a special control circuit, has a simple structure, is small in size, and is easy to assemble, thus improving productivity.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of an impact detection device according to the present invention in a vertical cross section along a width direction of a vehicle.

FIG. 2 is a perspective view showing a first embodiment of an impact detection device according to the present invention.

FIG. 3 is a diagram showing a state in which a membrane switch is activated by receiving a load due to an impact in FIG.

FIG. 4 is a graph showing a load-deformation length curve in a bulging portion of a beam plate of the impact detection device according to the first embodiment.

FIG. 5 is a graph showing the pressing force applied to the membrane switch over time in the impact detection device according to the first embodiment.

FIG. 6 is a view showing an impact detection device according to a second embodiment, which is vertically cut along the width direction of the vehicle.

FIG. 7 is a graph showing the load applied to the bulging portion of the beam plate of the impact detection device according to the second embodiment over time.

FIG. 8 is a diagram showing an impact detection device according to a third embodiment, which is vertically cut along the width direction of the vehicle.

FIG. 9 is a graph showing the load applied to the beam plate due to the impact over time in the impact detection device in which the membrane switch is directly pressed by the beam plate without the disc spring.

[Explanation of symbols]

 16 Beam plate (first pressure receiving member) 24 Membrane switch (switch member) 26 Disc spring (second pressure receiving member)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor, Hisahiro Ando, Noguchi, Oguchi-machi, Niwa-gun, Aichi No. 1 Noda, Tokai Rika Electric Co., Ltd. (72) Keiichi Tamura, Oguchi-machi, Niwa-gun, Aichi Noda No. 1 Tokai Rika Electric Co., Ltd. (72) Inventor Makoto Shioda No. 1 Toyota-cho, Toyota City, Aichi Prefecture Toyota Automobile Co., Ltd. (72) Koichi Fujita No. 1 Toyota-cho, Aichi Prefecture Toyota Auto Stocks Company (72) Inventor Tomoyuki Fukatsu 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Kenji Ogata 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Kiuchi Toru Toyota, Toyota City, Aichi Prefecture

Claims (1)

[Scope of utility model registration request] 1. A switch member that is pressed and operated, a first pressure receiving member that is pressed and elastically deformed by receiving a load due to an impact, and is provided between the switch member and the first pressure receiving member and is pressed. Is pressed by the elastic deformation of the first pressure receiving member to press the switch member by elastically deforming, and the deformed shape required for the operation of the switch member when the load disappears due to the impact is the switch member of the first pressure receiving member. A second pressure receiving member, which is maintained for a longer period of time than the deformed shape started to operate and returns and deforms by the return deformation of the first pressure receiving member;
An impact detection device comprising: