JPH0642463U - Shock detector - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the operating time of the switch member with a simple structure. An upper plate 32 is attached to a lower plate 30, and a pressure receiving portion 44 of the upper plate 32 is elastically deformed when pressed by an impact load,
The membrane switch 34 is pressed. Pressure receiving part 44
The extending piece 62 that moves integrally with the dividing piece 64 of the lower plate 30 is disposed so as to face the dividing piece 64 of the lower plate 30.
The vehicle laterally inward slope portion 70 of the corresponding dog-legged portion 68 of the extension piece 62 is positioned at the vehicle lateral side of the dog-legged portion 66 of the split piece 64 of the lower plate 30 against the elastic restoring force toward the vehicle. A resistance force against this return movement is given to the pressure receiving portion 44 by sliding up the inward sloping portion 72 in the direction. This resistance is increased as the amount of movement of the pressure receiving portion 44 in the membrane switch operating direction before the pressing force received by the pressure receiving portion 44 starts to decrease increases. This resistance delays the return movement of the pressure receiving portion 44.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an impact detection device for detecting 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]

 Even in the case of a side collision of the vehicle, it is conceivable to activate the airbag device.

For that purpose, an impact detection device that detects an impact due to a side collision and outputs the detection signal to the airbag device side is required.

As the impact detection device, a membrane switch as a switch member and a pressure receiving plate located laterally outward of the vehicle facing the membrane switch are provided inside the door of the vehicle. When the vehicle collides with the door from the lateral direction, the pressure receiving plate is pressed and elastically deformed inward in the lateral direction of the vehicle, and this elastic deformation may press the membrane switch to operate.

[0005]

[Problems to be solved by the device]

 By the way, in the above impact detection device, after the impact load is generated and the membrane switch is actuated, in the process of disappearing the impact load, the pressing force for pressing the pressure receiving plate decreases, and If the deformed shape required for operation cannot be maintained, the operation of the membrane switch stops.

Here, if the operation time of the membrane switch is short, the signal output time to the airbag device side is also shortened, and it is not possible to operate the airbag device, or the signal output is truly If it is difficult to distinguish between the collision and the electrical noise, it is necessary to provide a separate control circuit to avoid this.

In view of the above facts, the present invention has an object to provide an impact detection device having a simple structure and capable of lengthening the operation time of a switch member.

[0008]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a base member, a switch member provided on the base member, and an elastic deformation when the base member is pressed to move the switch member. The pressure receiving member, which is provided between the base member and the pressure receiving member, increases the resistance of the pressure receiving member to the return movement as the moving amount of the pressure receiving member in the switch member operating direction increases. The present invention proposes an impact detection device characterized by including a returning means.

[0009]

[Action]

 According to the impact detection device of the present invention, when an impact load is generated, the pressure receiving member is pressed and starts to move in the switch member operating direction with elastic deformation. As the pressing force received by the pressure receiving member rises, the pressure receiving member increases the moving amount in the switch member operating direction. Then, the switch member starts to operate.

In the process of disappearing the impact load, the pressure receiving member is returned and moved as the pressing force received by the pressure receiving member decreases.

Here, the return force is applied to the pressure receiving member by the returning means, and the resistance force is applied to the switch member operating direction of the pressure receiving member before the pressing force received by the pressure receiving member starts to decrease. The greater the amount of movement to, the greater. Due to the resistance to the return movement of the pressure receiving member, the return movement of the pressure receiving member is delayed.

As a result, a long operating time of the switch member can be obtained, which is achieved by a simple structure without providing a separate control circuit.

[0013]

【Example】

 A shock detecting device according to a first embodiment of the present invention will be described with reference to FIGS. In each drawing, the arrow FR indicates the front of the vehicle, the arrow OUT indicates the vehicle lateral direction outward, and the arrow UP indicates the upper side of the vehicle. First, as shown in FIGS. 2 and 3, inside the door 12 of the vehicle, A side impact beam 14 is provided. The side impact beam 14 is formed in a long circular tube shape whose longitudinal direction is the vehicle front-rear direction, extends over the dimension of the door 12 in the vehicle front-rear direction (FIG. 3), and collides from the lateral side of the vehicle. On the other hand, the door 12 is reinforced.

A secondary sensor 16 is provided outside the side impact beam 14 in the lateral direction of the vehicle. In the secondary sensor 16, as shown in FIG. 1, a substrate 18 is fixed to the circumferential surface of the side impact beam 14, and a recess 20 is formed on the substrate 18 outward in the vehicle lateral direction. The membrane switch 22 is fixed, and the recess 20 is closed by the lid plate 24. The board 18, the recess 20, the membrane switch 22, and the cover plate 24 extend over the entire front-rear direction of the side impact beam 14 (FIG. 3), and the overall external shape of the secondary sensor 16 is as shown in FIG. It is formed in a long plate shape having a longitudinal direction and a vehicle vertical direction as a width direction.

According to the secondary sensor 16, when an impact load is applied to the lid plate 24 from the outside in the vehicle lateral direction, the lid plate 24 is pressed inward in the vehicle lateral direction, the shape of the recess 20 is crushed, and the lid body 24 is crushed. Therefore, the membrane switch 22 in the recess 20 is pressed to operate. When the membrane switch 22 is actuated by being pressed, it is connected to the membrane switch 22 and through a terminal piece 26 projectingly formed in an L-shape at the front ends of the vehicles, an occupant protection device (not shown) such as an airbag. An electric signal is output to the device side.

The secondary sensor 16 is set so as to operate under a high load, and is operable even when an impact load is applied at any position along the vehicle front-rear direction.

As shown in FIG. 3, the secondary sensor 16 has a plurality of primary sensors 28 (in FIG. 3, a plurality of primary sensors 28 constituting the impact detection device according to the present embodiment at predetermined intervals in the vehicle front-rear direction). Three primary sensors 28) are attached.

As shown in FIGS. 1, 4, 5, and 6, the primary sensor 28 forms a switch member between a lower plate 30 forming a base member and an upper plate 32 forming a pressure receiving member. Membrane switch 34 is arranged and configured. The lower plate 30 is formed by bending a vertical back piece 36 and a pair of horizontal facing pieces 38 facing each other in the vertical direction into a U-shape. The primary sensor 28 is mounted by the back piece 36 making surface contact with the outer surface of the secondary sensor 16 in the vehicle lateral direction, and the opposing pieces 38 sandwiching the vehicle vertical end of the secondary sensor 16. The outer surface of the bent portion 40 of the back piece 36 and the facing piece 38 is chamfered in an arc shape, and each facing piece 38 is formed with two slits 41 that divide the facing piece into three in the vehicle front-rear direction. Of the three divided pieces, the divided piece 42 at the vehicle rear and the divided piece 42 at the center are bent inwardly in a dogleg shape, and these are formed at both ends of the secondary sensor 16 in the vehicle vertical direction. The primary sensor 28 is elastically engaged so that the primary sensor 28 can be attached to and detached from the secondary sensor 16. As a result, the primary sensor 28 can be attached to the secondary sensor 16 at any position along the vehicle front-rear direction, and the attachment interval of the primary sensors and the number thereof can be easily changed. It should be noted that the mounting position of the primary sensor 28 can be reliably obtained by forming the engaging recess 17 in the secondary sensor 16 into which the split piece 42 bent in a dogleg shape is engaged.

The upper plate 32 is made of an elastically deformable material and is attached to the lower plate 30. As shown in FIG. 5, the upper plate 32 is formed in a rectangular shape when viewed from the lateral direction of the vehicle. The back piece 36 is disposed on the outer surface of the vehicle 36 in the lateral direction, leaving the peripheral portion of the back piece 36. The rear end portion of the vehicle of the upper plate 32 serves as a mounting portion 31 that abuts on the back piece 36 and is fixed by spot welding, and the remaining portion is bent and separated from the lateral lateral outer surface of the back piece 36 of the lower plate 30. The pressure receiving portion 44 extends in front of the vehicle (FIG. 6). Further, at the center of the pressure-receiving portion 44 in the vehicle front-rear direction, convex portions 48 are integrally formed at both upper and lower edges, and the projecting tips of each convex portion 48 reach the upper and lower ends of the lower plate 30 by a distance L1. Each extends to a non-existing position (Fig. 5).

When an impact load is applied to the pressure receiving portion 44 of the upper plate 32 from the outside in the lateral direction of the vehicle, the pressure receiving portion 44 mainly rotates about the base end of the mounting portion 31 as a rotation center. Along with the sexual deformation, the lower plate 30 is moved closer to the back piece 36 from its original shape position (shown by the solid line in FIG. 6) parallel to the back piece 36 (shown by the chain line in FIG. 6). When the impact load is removed, the elastic receiving force causes the pressure receiving portion 44 to return and deform in the original shape direction.

The membrane switch 34 is attached to the lower plate 30 and, as shown in FIG. 5, is formed in a long plate shape having the vehicle up-down direction as a longitudinal direction, and has a back piece 36 of the lower plate 30 and an upper plate 32. It is inserted between the pressure receiving portion 44. The upper and lower end portions of the membrane switch 34 are located opposite to the respective convex portions 48 of the pressure receiving portion 44, and extend from the upper and lower ends of the lower plate 30 vertically and outwardly. A total of four claw pieces 50 are erected in an L-shape on the back piece 36 of the lower plate 30 on the vehicle front-rear side via the respective convex portions 48, and the membrane switch corresponding to each claw piece 50 is positioned. The both ends of the vehicle 34 in the vehicle front-rear direction are locked by the claw pieces 50, and the membrane switch 34 is attached. Here, since each claw piece 50 is located on the vehicle front-rear side via the convex portion 48, it does not interfere with the movement of the pressure receiving portion 44 of the upper plate 32, and the upper plate 32 is not lowered. Even after being attached to 30, the attachment work of the membrane switch 34 by the claw piece 50 is easy.

Although not shown, the membrane switch 34 has a pair of phosphor bronze electrodes which are spaced apart in the lateral direction of the vehicle via an insulator made of synthetic resin, and these electrodes are made of synthetic material such as polyester. It is housed in an insulative casing made of resin, and an actuator 52 is fixed to the outer surface of the casing in the vehicle lateral direction. As shown in FIG. 5, the actuator 52 is formed in the shape of a rectangular rod whose longitudinal direction is the vehicle vertical direction, and is located at the center of the membrane switch 34 in the vehicle longitudinal direction. The upper and lower ends of the actuator 52 are vertically and outwardly protruded from the tips of the protrusions 48 by a distance L2, and are also vertically and outwardly protruded from the upper and lower ends of the lower plate 30 by a distance L3. .

When the pressure receiving portion 44 of the upper plate 32 is moved toward the back piece 36 of the lower plate 30 with elastic deformation, the actuator 52 is pressed inward in the lateral direction of the vehicle. As a result, the casing of the membrane switch 34 is compressed, the electrodes come into contact with each other, and an electric signal is output to the airbag device side via the terminal piece 54 protruding from the upper end of the membrane switch 34 in an L shape. . When the upper plate 32 is moved back, the actuator 52 is no longer pressed, and the electrodes, insulators, and casings that make up the membrane switch 32 including the actuator 52 are returned to their original shape, and the membrane switch 32 as a whole is in its original shape. Get again.

The primary sensor 28 is set to operate under a low load, but even if one of the plurality of primary sensors 28 operates, the other primary sensors 28 are included. If all the primary sensors 28 are not activated, the airbag device will not be activated. Therefore, in the case where only one primary sensor 28 operates, the primary sensor 28 stops its operation when the load is removed, and prepares for the subsequent collision.

The above-mentioned secondary sensor 16 operates under a high load to operate the airbag device, whereas the primary sensor 28 operates under a low load and has a predetermined number, for example, two or more. The airbag device is prevented from being activated when the primary sensor 28 is not actuated, which corresponds to various impact modes. For example, when the impact load is dispersedly applied to the door 12, the impact load is not a high load that partially activates the secondary sensor 16, but the airbag device as a whole needs to be activated. When the load is applied, the airbag device is operated by operating a predetermined number, for example, two or more primary sensors 28.

On the contrary, when the impact load is concentrated on a certain portion of the door 12, if the impact load is a high load required to operate the airbag device, the primary sensor 28 is activated or deactivated. Regardless, the secondary sensor 16 operates and the airbag device operates.

At the vehicle front end of the pressure receiving portion 44, a pair of extension pieces 62 that move integrally with the pressure receiving portion 44 are provided. Each of the extending pieces 62 extends from the upper and lower end portions of the pressure receiving portion 44 upward and downward, and then is bent and formed inward in the lateral direction of the vehicle so as to face each other. Of the three divided pieces of the facing piece 38, Are arranged opposite to each other along the outside of the divided piece 64 in front of the vehicle. As shown in FIG. 4, a dogleg portion 66 that is bent outward in a dogleg shape is formed at the tip of each of the divided pieces 64 that face each other in the vertical direction. The tip of the piece 62 is also formed with a corresponding dogleg 68 bent outward in a dogleg shape. The dog-legged portion 66 and the corresponding dog-legged portion 68 form a returning means.

Both extension pieces 62 are urged by elastic restoring force in a direction in which the corresponding doglegs 68 approach each other with the base end of the pressure receiving portion 44 as the center of rotation. Normally, as shown in FIG. 4, the vehicle lateral direction inward slope portion 72 of the dog-legged portion 66 abuts on the corresponding vehicle lateral direction inward slope portion 70 of the dog-legged portion 68 so that the vehicle lateral direction The inward slope portion 70 is pressed against the elastic restoring force (rotational urging force) of the extension piece 62, so that both extension pieces 62 are positioned horizontally and the lateral side of the V-shaped portion 68 of the extension piece 62 is positioned horizontally. The direction outward slope portion 74 and the vehicle lateral direction outward slope portion 76 of the dogleg portion 66 are largely separated.

When the pressure receiving portion 44 is moved close to the back piece 36 of the lower plate 30 (moves in the membrane switch operation direction), each extending piece 62 is moved inward in the vehicle lateral direction as shown in FIG. Based on the elastic restoring force of the extending piece 62, the vehicle lateral inward slope portion 70 of the corresponding dog-legged portion 68 and the vehicle lateral direction inward slope portion 72 of the dog-legged portion 66 are moved integrally. And slide down. As a result, the extension piece 62 is positioned so as to be inclined from the horizontal position. At this time, the vehicle lateral outward slope portion 74 of the corresponding dogleg portion 68 is brought close to the vehicle lateral outward slope portion 76 of the dogleg portion 66.

When the pressure receiving portion 44 is moved back, each extension piece 62 is integrally moved outward in the vehicle lateral direction, and resists the elastic restoring force of the extension piece 62, and the corresponding dogleg portion is formed. The vehicle lateral direction inward slope portion 70 of 68 is brought into sliding contact with the vehicle lateral direction inner slope portion 72 of the dog-legged portion 66, and the extending piece 62 obtains the horizontal position again (FIG. 4).

Next, the operation of the above embodiment will be described. First, when another vehicle collides with the door 12 of the vehicle from the outside in the lateral direction of the vehicle, an impact load is generated and the pressure receiving portion 44 of the upper plate 32 is pressed. Then, the pressure receiving portion 44 starts moving in the switch member operating direction with elastic deformation. As the pressing force received by the pressure receiving portion 44 increases, the pressure receiving portion 44 increases the moving amount in the membrane switch operating direction. Then, when the pressing force received by the pressure receiving portion 44 reaches the operation start load required to start the operation of the membrane switch 34, the membrane switch 34 starts to operate.

In the process of disappearing the impact load, the pressure receiving portion 44 is returned and moved as the pressing force received by the pressure receiving portion 44 decreases.

Here, when the pressure receiving portion 44 is moved back, each extension piece 62 is integrally moved outward in the lateral direction of the vehicle and at the same time resists the elastic return force of the extension piece 62. Since the vehicle lateral inward slope portion 70 of the corresponding dog-legged portion 68 is required to slide up against the vehicle lateral inward slope portion 72 of the dog-legged portion 66, the pressure receiving portion 44 must be provided with the pressure receiving portion 44. Resistance to the return movement of is given. Moreover, as the amount of movement of the pressure receiving portion 44 in the membrane switch operating direction increases, that is, if the amount of movement of the pressure receiving portion 44 in the switch member operating direction before the pressing force received by the pressure receiving portion 44 begins to decrease, the amount increases. The amount by which the vehicle lateral direction inward slope portion 70 of the corresponding dogleg portion 68 slides down on the vehicle lateral direction inward slope portion 72 of the dogleg portion 66 (the amount of movement of the extension piece 62 in the elastic return direction). ) Is increased, and the vehicle lateral inward slope portion 70 of the corresponding dogleg 68 is slidably brought into contact with the vehicle lateral inward slope portion 72 of the dogleg 66, so that the extension piece 62 A large counter force is required to counter the elastic return force of the pressure receiving portion 44, and the resistance force against the return movement of the pressure receiving portion 44 is increased.

Due to the resistance against the return movement of the pressure receiving portion 44, even if the return movement of the pressure receiving portion 44 is delayed and the pressing force received by the pressure receiving portion 44 is below the operation start load, the membrane switch 34 of the pressure receiving portion 44 is The position of the pressure receiving portion 44 required for the operation of is maintained, and the operation of the membrane switch 34 continues. Then, the pressure receiving portion 44 is returned to the position where the operation of the membrane switch 34 is completed.

Accordingly, the operation time of the membrane switch 34 is lengthened and the output time of the electric signal to the airbag device side is also lengthened by a simple structure without providing a separate control circuit, and the airbag is Sufficient time is available to operate the device. Also, it becomes easy to distinguish whether the electric signal is due to a collision or simply due to electric noise. Therefore, a reliable operation can be obtained in detecting a shock.

In this embodiment, a plurality of primary sensors 28 are provided, and when a predetermined number, for example, two or more primary sensors 28 of them are activated, the airbag device is activated. At this time, the membrane switches 34 do not always start operating at the same time. Therefore, if the operation time of the primary sensor 28 becomes long, the operation time of each primary sensor 28 can be overlapped for a long time even if the operation of each primary sensor 28 does not start at the same time. Reliability is improved.

It should be noted that the pressure receiving portion 44 of the upper plate 32 can move toward the back piece 36 of the lower plate 30 even if the pressure receiving portion 44 is pressed at any position of the overall size of the vehicle upward and downward. . Moreover, a convex portion 48 is formed so as to project in the vehicle vertical direction at the edge of the pressure receiving portion 44 in the vehicle vertical direction. When another vehicle collides with the door from the lateral side of the vehicle, the part of the other vehicle that first comes into contact with the door is usually the part of the bumper. If different from the height, as shown in FIG. 4, an impact load acts on the pressure receiving portion 44 of the upper plate 32 from the oblique direction (indicated by arrows A and B) between the vehicle lateral direction and the vehicle vertical direction. Will be done. At this time, the impact load from the diagonal direction is received by the vehicle vertical direction end portion of the pressure receiving portion 44. That is, the impact load from diagonally above (arrow A) is received by the upper end of the pressure receiving portion 44, and the impact load from diagonally below (arrow B) is received by the lower end of the pressure receiving portion 44. At the end of the vehicle facing upward and downward, the pressure receiving portion 44 can be moved, and the pressure receiving portion 44 is weakened in rigidity by the convex portion 48 and is easily elastically deformed. Even in this direction, a predetermined elastic deformation can be generated in the pressure receiving portion 44 as in the case where the impact load acts on the pressure receiving portion 44 from the side (shown by the arrow C). Further, since the actuator 52 of the membrane switch 34 extends outward in the vertical direction from the convex portion 48 of the pressure receiving portion 44, the actuator 52 is surely pressed by the elastic deformation at the lateral end portion of the vehicle of the pressure receiving portion 44. , The membrane switch 34 is operated accurately.

As described above, even if the acting direction of the impact load on the pressure receiving portion 44 is different, the membrane switch 34 operates with the impact load of the same magnitude. Therefore, the action direction of the impact load is allowed over a wide range to operate the impact detection device.

Experimentally, extremely good results were obtained when the acting direction of the impact load was in the range of 45 ° above and below the horizontal direction indicated by arrow C.

When the actuator 52 is pressed by the upper and lower ends of the pressure receiving portion 44, even if the primary sensor 28 is bent at the bent portion 40 of the back piece 36 of the lower sensor 30 and the facing piece 38, Since the curved portion 40 is formed in an arc shape, the primary sensor 28 is bent along the arc shape, and plastic deformation that cannot restore the original shape is prevented. In particular, the membrane switch 34 is effective in that it is made of a soft material. Further, since the actuator 52 is projected upward and downward from the upper and lower ends of the back piece 36 of the lower sensor 30, the membrane switch 34 is bent at the bent portion 40 of the back piece 36 and the facing piece 38 of the lower plate 30. Is suppressed.

Next, a second embodiment will be described with reference to FIGS. 8 to 10. In the primary sensor 100 of the present embodiment, as shown in FIGS. 9 and 10, the tip portion of the divided piece 104 obtained in front of the vehicle by dividing the facing piece 101 (FIG. 10) of the lower plate 102 into three divided pieces. Is bent vertically to the outside to form the support piece 106, and the tip end of the extending piece 110 of the upper plate 108 is bent vertically to the outside to form the support piece 112. Faced apart from each other.

A suction cup 114, which constitutes a returning means, is attached to the support piece 112. The suction cup 114 has a neck portion 120 formed between the head portion 116 and the suction cup body 118, and the neck portion 120 is fitted into a mounting hole 122 formed in the support piece 112, so that the head portion 116 and the suction cup body 118. The suction cup 114 is attached so that the support piece 112 is sandwiched between it and. It should be noted that reference numeral 124 in FIG. 9 denotes an open groove communicating with the mounting hole 122 and opened to the outside, and the suction cup 114 is introduced into the mounting hole 122 through the open groove 124.

Here, the suction cup body 118 faces the support piece 106, and normally, the suction cup body 118 and the attracted portion 106 are separated by a distance L4. When the pressure receiving portion 44 of the upper plate 108 moves in the membrane switch operating direction and the extending piece 110 moves integrally, the suction cup body 118 moves inward in the vehicle lateral direction, abuts the support piece 106, and It is adsorbed on the piece 106.

As the pressure receiving portion 44 is moved back and the extension piece 110 is integrally moved, the suction cup body 118 moves outward in the vehicle lateral direction and separates from the support piece 106.

Here, when the pressure receiving portion 44 is moved back, the suction cup body 118 separates from the attracted portion 106 against the suction force thereof, so that the pressure receiving portion 44 returns to the pressure receiving portion 44. Resistance to movement is given. Moreover, as the amount of movement of the pressure receiving portion 44 in the membrane switch operating direction increases, that is, if the amount of movement of the pressure receiving portion 44 in the switch member operating direction before the pressing force received by the pressure receiving portion 44 begins to decrease, The larger the support 112 is, the closer the support 112 is to the support 106. Therefore, the suction force of the suction cup body 118 is large, and a large counter force is required to counter the suction force in order to separate the suction cup body 118 from the support 106. This is necessary, and the resistance force to the return movement of the pressure receiving portion 44 is increased.

The resistance against the return movement of the pressure receiving portion 44 delays the return movement of the pressure receiving portion 44 and prolongs the operation time of the membrane switch 34, as in the first embodiment.

In the state where the pressure receiving portion 44 does not receive the pressing force, the suction cup body 118 and the support piece 106 are separated by the distance L4. This is because the pressing force is completely eliminated by completely eliminating the suction force. It is surely held in shape.

Further, in order to control the resistance at the time of the return movement of the pressure receiving portion 44, for example, a minute hole is provided in the rubber wall of the suction cup body 118, and air is made to slightly flow into the suction cup body 118 from this minute hole. You can also do so.

Further, although the suction cup body 118 is provided on the extension piece 110 side of the upper plate 108, it may be provided on the split piece 104 side of the lower plate 30. Furthermore, instead of the suction cup 114, a pair of The magnet may be provided.

Although not shown, magnets having different magnetic poles facing each other are fixed to the support piece 112 of the extension piece 110 and the support piece 106 of the split piece 104, and the return means is provided by these magnets. Is configured. According to this, as the pressure receiving portion 44 moves in the membrane switch actuating direction, the support piece 112 moves closer to the support piece 106, so that an attraction force is obtained between the magnets. Resistance to the return movement of the pressure receiving portion 44 occurs. This suction force also increases as the amount of movement of the pressure receiving portion 44 in the membrane switch operating direction increases, that is, the amount of movement of the pressure receiving portion 44 in the switch member operating direction before the pressing force received by the pressure receiving portion 44 begins to decrease. Is larger, the support piece 112 is closer to the support piece 106, and the suction force is larger. At this time, it is preferable that both magnets do not come into contact with each other at the position where the supporting piece 112 moves closest to the supporting piece 106. This prevents the attraction force from becoming excessive due to the contact. Then, the return movement of the pressure receiving portion 44 becomes reliable.

As a result, the return movement of the pressure receiving portion 44 is delayed and the operation time of the membrane switch 34 is lengthened, as in the first embodiment.

Further, although not shown in the drawings, a rubber material is provided on the support piece 106 of the divided piece 104, and the extension piece 110 is extended straight without bending the tip end of the extension piece 110. When the straight tip end of 110 is moved closer to the support piece 106 of the divided piece 104, the straight tip end of the piece 110 is inserted into a tapered hole formed in a rubber material so as to narrow toward the bottom. It is also possible that damping resistance is generated between the rubber material and this damping resistance serves as resistance against the return movement of the pressure receiving portion 44. Even with the returning means configured as described above, as the amount of movement of the pressure receiving portion 44 in the membrane switch operating direction increases, that is, the switch of the pressure receiving portion 44 before the pressing force received by the pressure receiving portion 44 begins to decrease. The greater the amount of movement in the member operating direction, the greater the amount that the straight tip end of the extension piece 110 enters into the hole of the rubber material, and the greater the damping resistance, the same as in the first embodiment. The effect is obtained, the return movement of the pressure receiving portion 44 is delayed, and the operation time of the membrane switch 34 is lengthened.

Note that various other means are possible as the returning means. The present invention is not limited to the above embodiments, but can be variously modified. For example, in each of the above embodiments, the impact detection device for operating the air bag device as the occupant protection device in the case of a side collision of the vehicle has been described. The airbag device is not limited to the one installed in the door provided with the impact detection device, but may be the one for the driver's seat or the passenger seat, and is not limited to the airbag device. Instead, it may be for activating other occupant protection devices such as a preloader that winds up the webbing when the vehicle suddenly decelerates, or a device other than the occupant protection device. Therefore, it is not limited to a low load, and it is applicable even if it is a single one without providing a plurality.

Further, in each of the above-described embodiments, the upper plates 32, 108 are formed by forming the protruding portions 48 on the pressure receiving portion 44 so that the upper plates 32, 108 have such a shape. Not limited.

[0055]

[Effect of device]

 According to the shock detecting device of the present invention having the above-described configuration, the operating time of the switch member is extended with a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view of an impact detection device according to a first exemplary embodiment of the present invention.

FIG. 2 is a diagram showing the impact detection device according to the first embodiment inside the door of the vehicle, as viewed from the rear of the vehicle.

FIG. 3 is a diagram showing the impact detection device according to the first embodiment inside the door of the vehicle, as viewed from above the vehicle.

FIG. 4 is a diagram of the impact detection device according to the first embodiment as viewed from the front of the vehicle.

FIG. 5 is a diagram of the impact detection device according to the first embodiment as viewed from the outside in the lateral direction of the vehicle.

FIG. 6 is a view of the impact detection device according to the first embodiment as viewed from below the vehicle.

FIG. 7 is a diagram showing an operating state of the impact detection device in FIG.

FIG. 8 is a front view of an impact detection device according to a second embodiment of the present invention.

FIG. 9 is a diagram of the impact detection device according to the second embodiment as viewed from the outside in the lateral direction of the vehicle.

FIG. 10 is a diagram of the impact detection device according to the second embodiment as viewed from below the vehicle.

[Explanation of symbols]

 30 Lower Plate (Base Member) 32 Upper Plate (Pressure Receiving Member) 34 Membrane Switch (Switch Member) 66 Claw Shape (Returning Means) 68 Corresponding Couple Shape (Returning Means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hobo Hori Aichi Noguchi, Oguchi-cho, Niwa-gun, No. 1 Noda, Tokai Rika Denki Seisakusho Co., Ltd. Car Co., Ltd. (72) Creator Tomoyuki Fukatsu 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A base member, a switch member provided on the base member, a pressure receiving member which is provided on the base member and moves with elastic deformation to press the switch member when pressed, and the base. The pressure receiving member is provided between the member and the pressure receiving member, and the pressure receiving member is provided with a returning unit that increases resistance to the return movement of the pressure receiving member as the moving amount of the pressure receiving member in the switch member operating direction increases. Impact detection device characterized by.