JPH111154A - Occupant detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an occupant detecting device that can obtain excellent detecting accuracy without using a large number of load cells or a load cell with a large measuring range while suppressing the increase of manufacturing cost. SOLUTION: A weight receiving face member 15 of almost plane shape with support leg parts 15a... provided protruding downward is laid below a seat cushion 14, and a sensor link formed of a V-shape arm 30 and auxiliary arms 29, 29 with the corner parts journalled through rotating shaft parts 24, 24 or 26, 26 is provided above a seat mounting frame 19 disposed on the floor face of a cabin. The support leg parts 15a... are brought into contact with an upper face part in positions inside the rotating shaft parts 24, 26 of the sensor link, and a load cell 10 is interposed between the upper face part 19d of the seat mounting frame 19 and a pressing protrusion 28 formed at the rotating end lower face part of the V-shape arm 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to an occupant sitting on a seat in order to determine whether or not to transmit a deployment permission signal or the like to a passenger airbag when a driver airbag is deployed. The present invention relates to an occupant detection device that detects that an event has occurred.

[0002]

2. Description of the Related Art As a conventional control apparatus for a passenger airbag, for example, a control apparatus as shown in FIG. 9 is known.

In such a vehicle, when an occupant is not seated in the passenger seat, the acceleration waveform detected by the acceleration sensor 1 is calculated by a microcomputer in order to prevent unnecessary deployment of the passenger airbag device 3. 2 and is switched to the ON state when seated between the detonator 4 of the passenger seat airbag device 3 and the deployment signal sent from the microcomputer 2 is conducted to the detonator 4 and the A manual switch 5 is provided for manually switching to an OFF state when seated.

When the vehicle receives an acceleration exceeding a predetermined value due to a collision or the like, a mechanical acceleration switch 8 such as a mercury acceleration sensor is turned on, and at the same time, a development signal is sent from the microcomputer 2 to the driver's seat. The airbag device 6 is sent to the primer 7 of the airbag device 6, and the driver's seat airbag device 6 is deployed.

At this time, if the manual switch 5 is manually turned on,
The deployment signal transmitted from the microcomputer 2 is conducted to the primer 4 to deploy the passenger airbag device 3.

If the manual switch 5 is manually turned off, the deployment signal sent from the microcomputer 2 is not conducted to the primer 4 and the passenger airbag device 3 is turned off. Since it is not deployed, unnecessary deployment of the passenger airbag device 3 is prevented.

On the other hand, in recent years, along with the flow of automation, the manual switch 5 is replaced with various sensors for detecting a state where an occupant is seated in the passenger seat, thereby eliminating the trouble of manually switching ON and OFF. It is thought to be.

[0008] For example, a human body in a seated state is detected by capacitors provided above and below the passenger seat, and an infrared sensor provided on an instrument panel is used.
There are known ones that detect the occupant's body temperature, ones that detect reflected waves using an ultrasonic sensor, and the like.

It is also known that the condenser bipolar plates are provided in a comb-teeth shape on the front passenger seat surface to detect a change in capacitance when seated.

[0010] Further, as shown in FIG. 10, there is also known one in which a load cell 10 for detecting the weight of a passenger in a front passenger seat is provided in a seat portion 9.

[0011]

However, these various sensors, such as the above-mentioned capacitor, are expensive and used in combination to prevent malfunction. For this reason, there has been a problem that the manufacturing cost is increased.

Further, in the case where the condenser bipolar plates are provided in a comb-teeth shape on the front passenger seat surface, every time an occupant sits,
These capacitor bipolar plates were bent, resulting in severe metal fatigue and poor durability.

Further, in the case where the load cell 10 for detecting the weight of the occupant in the front passenger seat is provided in the seat 9, for example, even though the load cell 10 is provided substantially at the center of the seat, the occupant may be positioned at the corner of the seat. If the load cell arrangement position does not match the seating position, for example, if the driver sits on one side, the weight of the occupant may change depending on the occupant's seating state, and the detection accuracy may be reduced.

Further, the weight of the occupant can be reduced by one load cell 10.
In order to detect the load cell, a load cell 10 having a large measurement range must be used. For this reason, an expensive load cell must be used, and there is a possibility that manufacturing costs may increase.

Further, by arranging a plurality of load cells 10 at the four corners of the seat 9 while improving the detection accuracy,
It is conceivable to disperse the weight borne by one load cell 10 and use a load cell with a small measurement range.
In such a configuration, although the unit price of the load cell is reduced, there is a problem that the increase in the number of load cells and the increase in manufacturing cost cannot be suppressed.

Therefore, an object of the present invention is to provide
No. 165530, Japanese Utility Model Application Laid-Open No. 63-175821, etc.
An object of the present invention is to provide an occupant detection device that can obtain good detection accuracy without using a large number of load cells or a large measurement range while suppressing an increase in manufacturing cost.

[0017]

According to the first aspect of the present invention, an approximately planar weight receiving surface member is laid below a seat cushion. A sensor link whose corner is pivotally supported via a rotating shaft is provided above the seat mounting frame disposed on the floor of the passenger compartment, and the sensor link is provided on the upper surface of the sensor link at an inner position relative to the corner. The occupant detection device is characterized in that a part of the weight receiving surface member is brought into contact with the occupant detection device, and a weight sensor is interposed between the seat mounting frame and the tip of the sensor link.

According to the first aspect of the present invention, when the occupant sits on the seat cushion, the weight receiving surface member laid below receives the weight of the occupant,
The weight is transmitted to the sensor link via a part of the weight receiving surface member.

Therefore, the weight of the occupant is reduced to a small number, for example, 1
With one weight sensor.

The sensor link rotates about the rotation shaft provided at the corner, and swings the opposite rotation end downward. At this time, the distance from the rotation shaft portion, which is a fulcrum, is greater than the distance from the upper surface portion, which is a point of force, to the support leg contact portion, but the distance to the rotation end, which is the point of application to the weight sensor. Can be set long.

For this reason, the weight of the occupant seated on the seat cushion is reduced according to the distance ratio, and the measurement range of the weight sensor is narrow, for example, with one weight sensor.
A seated state and a non-seated state can be detected.

Accordingly, good detection accuracy can be obtained without using a load cell having a large load capacity while suppressing an increase in manufacturing cost.

According to a second aspect of the present invention, a support leg is provided on a part of the weight receiving surface member, and the support leg is provided near four corners of a lower surface of the weight receiving surface member. The occupant detection device according to claim 1, wherein the occupant detection device is provided in a convex shape at a portion corresponding to (1).

According to the second aspect of the present invention, since the weight receiving surface member can be formed independently, the assembling property is good.

Further, even if the weight receiving surface member which is provided independently is used, the sensor link and the sensor link which are surely disposed below can be reliably provided without the weight receiving surface member being inclined by receiving a biased weight. Since the weight can be transmitted to the weight sensor, better detection accuracy can be obtained.

According to the third aspect,
The weight receiving surface member has a frame member that surrounds and forms the periphery of the weight receiving member in a substantially rectangular shape, and a mesh member stretched inside the frame member. The occupant detection device according to claim 2, wherein the occupant detection device is formed integrally with a portion corresponding to the vicinity of four corners of the mesh portion.

According to the third aspect of the present invention, the weight receiving surface member is formed so as to surround the periphery of the weight receiving member in a substantially rectangular shape, and is stretched inside the frame member. Since it is configured to have the net-like member, it can be formed independently and has good assemblability.

Further, even if the weight of the occupant is applied to any part of the weight receiving surface material, the mesh member transmits the weight to the frame member almost uniformly. Then, the substantially equally distributed weights are transmitted to the sensor link from the supporting legs provided on the frame member having high rigidity.

[0029] Even when the weight receiving surface member independently provided as described above is used, the sensor link and the weight sensor that are surely disposed below the weight receiving surface material without being inclined due to the uneven weight. Can transmit the weight to
Good detection accuracy is obtained.

According to a fourth aspect of the present invention, the sensor link includes a main arm provided with the rotation shaft at both ends on the open side formed in a substantially V shape, and the sensor link provided at one end. An auxiliary arm for forming a shaft portion and locking the other end to a part of the main arm, the weight sensor is provided between the seat mounting frame and a lower surface of the other end of the main arm. The occupant detection device according to claim 1 to be interposed is characterized.

In the sensor link according to the fourth aspect of the present invention, in the sensor link, the V-shaped arm is provided with the rotating shafts at both ends on the open side formed in a substantially V shape.
The other end of the auxiliary arm that forms the rotation shaft at one end is connected to the V
Since it is locked to a part of the U-shaped arm, it receives the weight transmitted from the weight receiving surface member disposed above,
Regardless of the weight applied to any of the arms, all the weights are converted into a pivoting operation about the pivot shaft of the V-shaped arm, and the lower surface of the other end of the V-shaped arm is substantially moved. Move vertically.

For this reason, the seating of the occupant can be detected by interposing the weight sensor at one point on the lower surface portion of the other end, so that the configuration is made using one weight sensor without using a plurality of weight sensors. It is possible to suppress an increase in manufacturing cost.

According to the fifth aspect of the present invention,
Each rotation shaft portion of the sensor link forms a fulcrum,
A point at which a part of the receiving surface material contacts is defined as a force point, and a point at the tip corresponding to the position of the weight sensor of the sensor link is defined as an action point. The occupant detection device according to any one of claims 1 to 4, which is arranged inside the seat cushion.

According to the fifth aspect of the present invention, when the weight transmitted from the weight receiving surface member is received, the rotation of the main arm about the rotation shaft portion is performed. It is converted to move the lower surface of the other end of the main arm in a substantially vertical direction, and since the sensor link does not protrude outside the seat cushion, the appearance is good and it does not get in the way.

[0035]

Embodiment 1 Next, Embodiment 1 of the position detecting device of the present invention will be described with reference to FIGS. Parts that are the same as or equivalent to those in the conventional example will be described with the same reference numerals.

In the occupant detection device according to the first embodiment, the passenger seat 11 disposed in the vehicle cabin is mainly composed of the seat 9 and the backrest 12.

The seat 9 has a seat fabric 13, a seat cushion 14, and the like. Below the seat cushion 14, a convex support formed by a boss or the like protruding downward is formed. Leg portions 15a... Are provided in portions corresponding to four corners, and are substantially planar weight receiving surface members 1.
5 are laid.

As shown in FIG. 2, the weight receiving surface member 15 is provided with a metal frame member 16 which surrounds the periphery of the weight receiving member in a substantially rectangular shape.

Inside the frame member 16, a substantially square net-like member 18 is stretched by a plurality of spring members 17 and a plurality of ring-shaped hooks 18d. The net-like members 18 are longitudinal strips 18a attached along the longitudinal direction of the vehicle, and connecting strips 18b, 18b connected between the vertical strips 18a and arranged along the vehicle width direction. And

The supporting leg 15a is formed integrally with a portion of the frame member 16 corresponding to the vicinity of the four corners 18c of the mesh member 18.

As shown in FIG. 1, a seat mounting frame 19 is provided on the floor of the passenger compartment. The seat mounting frame 19 is provided with a pair of rail portions 19a on slide guides of fixed legs 20 fixed to the floor so as to be slidable in the vehicle front-rear direction by operation of a lever 19e provided at a foot. , 1
9a are arranged in sliding contact with each other.

A connecting frame 19b extends between the front ends of the rails 19a. The load cell 10 as a weight sensor is mounted on the upper surface 19d of the connection frame 19b.

Above the seat mounting frame 19, a lower peripheral frame 21 fixed to the seat mounting frame 19 by bolt members 21a and the like are rotatably supported on the seat mounting frame 19. A sensor link 22 is provided.

The sensor link 22 has pivot shaft portions 24, 2 at both open-side corners 23, 23 formed in a substantially V-shape.
A V-shaped arm 30 is provided as a main arm provided with 4, and the corners 23 are formed in a substantially U-shape.

The V-shaped arm 30 of the sensor link 21
In a substantially central portion, a pair of notched locked portions 22
b, 22b are formed. Further, a pressing protrusion 28 for pressing the load cell 10 is integrally formed below the other end 22c forming the tip of the V-shaped arm 30.

The pivot shafts 24, 24 are connected to the pair of rails 19 by bolt members 22a, 22a.
a, 19a so as to be rotatable at both rear end corners 19f, 19f.

The sensor link 22 is provided with a pair of auxiliary arms 29, 29.

Each of the pair of auxiliary arms 29, 29 has a pivot shaft 26 at one end corner 25, and the V-shaped arm 22 at the lower end 29a. Lock notch portions 29b, 29b are formed to be locked to the locked portions 22b, 22b formed substantially at the center of the frame.

Then, each of the rotation shafts 26, 26 is connected to the rail 19 by bolt members 22a, 22a.
a and 19a are pivotally attached to both front end corners 19g and 19g so as to be rotatable.

The rotating shafts 24, 24 and 26, 2
The V-shaped arm 22 and the auxiliary arms 29, 29, each of which is pivotally supported via the corresponding one of the corners 6, are brought into contact with the support leg 15a in contact with the upper surface of the inner position from these corners. Part 3
1, 31 and 32, 32 are each formed.

In this manner, the load cell 10 is configured to be interposed between the upper surface 19d of the seat mounting frame 19 and the pressing protrusion 28 formed on the lower surface of the rotation end of the sensor link 22. .

As shown in FIG. 4, the distance a from the rotation shaft portion 24 of the V-shaped arm 30 to the locked portion 22b for locking the auxiliary arm 29, and the auxiliary arm 29
Is formed so that the distance b from the rotation shaft portion 26 to the locking cut-out portion 29b on the other end lower side 29a to be locked to the V-shaped arm 30 is substantially equal.

The distance c from the rotating shaft portion 24 of the V-shaped arm 30 to the contact portion 31 formed on the upper surface at the inner position where the support leg portion 15a abuts. The load cell 10 is moved from the driving shaft 24 to the lower surface of the rotating end.
Is set so that the distance d to the pressing protrusion 28, which is the portion where the is interposed, becomes about 10 times.

That is, as a result, the force applied to the contacted portion 31 is reduced to 1/10 and transmitted to the load cell 10, in other words, (the force applied to the contacted portion 31).
× c = (force generated on the pressing protrusion 28) × d generates a force calculated by: Reference numeral 35 in FIG. 5 denotes a wire clip used for binding pipes and the like in a cross shape. The wire clip 35 stops the locking portions of the arms 29 and 30 and external vibrations cause the arms 29 and 30 to move. 30
Are separated to prevent rattling.

Next, the operation of the first embodiment will be described.

When the occupant sits on the seat cushion 14 of the seat 9, the weight receiving surface member 15
Receives the weight of the occupant, and is connected to the sensor link 22 through the support legs 15a projecting downward.
Transmit this weight.

The weight transmitted to each of these support legs 15a... Varies depending on where the occupant sits on seat cushion 14. That is, the weight is shared by the four support legs 15a and transmitted to the sensor link 30.

The weight receiving surface member 15 includes a frame member 16 which surrounds the periphery of the weight receiving member 15 in a substantially rectangular shape, and a mesh member 18 stretched inside the frame member 16. Therefore, they can be formed independently and have good assembling properties.

Even if the weight of the occupant is applied to any part of the weight receiving surface member 15, the mesh member 18 is moved forward and backward of the frame member 16 via the spring members 17 and the ring members 18d. Transmits weight approximately evenly to the sides.

The sensor link 22 has a support leg formed integrally with a portion corresponding to the vicinity of the four corners 18c of the mesh member 18 of the frame member 16 having relatively high rigidity. The dispersed weight is transmitted from the unit 15a.

Even if the independently provided weight receiving surface member 15 is used, even if the weight receiving surface member 15 receives a weight imbalanced due to the proper seating position, it is surely provided below. The weight can be transmitted to the sensor link 22 and one load cell 10.

Therefore, the load can always be accurately applied to the load cell 10 irrespective of the seating position of the occupant, so that there is no possibility that the detection accuracy is reduced by the seating position of the occupant as in the related art.

Each V-shaped arm 3 is pivoted about pivot shafts 24, 24 and 26, 26 provided at the corners 23, 23 at one end of the open side and the corners 25, 25 at one end.
0 and the auxiliary arm 29 rotate to swing the other end 22c, which is the opposite rotating end, downward.

At this time, as shown in FIG. 4, the distance d from the pivot shaft 24, which is a fulcrum, to the pressing projection 28 is determined by the rotation of the upper surface, which is the point of force, to the support leg contacted portion 31 on the upper surface. Shaft 2
The distance d from the distance c to the pressing protrusion 28 formed on the lower surface of the rotating end which is the point of action on the load cell 10 is longer than the distance c from the distance c, and is set to about 10 times in the first embodiment. I have.

For this reason, the weight of the occupant sitting on the seat 9 is reduced according to the distance ratio (1:10) to about 1
The load cell 10 can detect a seated state and a non-seated state by using one load cell 10 having a narrow measurement range. Therefore, good detection accuracy can be obtained without using a load cell having a wide measurement range while suppressing an increase in manufacturing cost.

In the sensor link 22, the V-shaped arm 30 is provided with the pivot shafts 24, 24 at both open-side corners 23, 23 formed in a substantially V-shape. Locking notches 29b, 29b formed on the lower ends 29a, 29a of the other ends of the auxiliary arms 29, 29 forming the rotating shafts 26, 26 in the V-shaped arms 3
0 are locked to the locked portions 22b, 22b.

For this reason, the sensor link 22 receives the weight transmitted from the support legs 15a of the weight receiving surface member 15 disposed above and determines which arm 30 or 29,2.
9, no matter how the weight is distributed and transmitted, all of the dispersed weight is converted into a pivoting motion about the pivot shaft portion 24 of the V-shaped arm 30, and this The pressing projection 28 formed on the lower surface of the other end of the V-shaped arm 30 is moved substantially vertically downward.

Therefore, by interposing the load cell 10 between the pressing projection 28, which is one point on the lower surface of the other end, and the upper surface 19d of the connecting frame 19b, the seating of the occupant can be detected. Load cell 10 ...
The occupant detection device can be configured by using one load cell 10 without using the occupant, and an increase in manufacturing cost can be suppressed.

As shown in FIG. 4, in the sensor link 22, a distance a from the rotation shaft portion 24 of the V-shaped arm 30 to a locked portion 22b for locking the auxiliary arm 29, A notch 29 at the other end for locking the V-shaped arm 30 from the pivot shaft 26 of the auxiliary arm 29.
Since the distance b to the b-shaped arm 30 is substantially equal, the weight received by any of the arms 30 or 29, 29 can be accurately determined by the locked portion of the V-shaped arm 30. 22b
To move the pressing protrusion 28 on the lower surface of the other end in a substantially vertical direction.

Therefore, a decrease in detection accuracy due to the seating position of the occupant is prevented.

As described above, according to the first embodiment, the sensor link 22 is provided on the upper surface of the inside position where the support leg 15a comes into contact with the rotation shaft 24 of the V-shaped arm 30. The distance d from the rotation shaft 24 to the intervening portion of the weight sensor on the lower surface of the rotation end is set to be about 10 times longer than the distance c to the contacted part 31. The weight transmitted from the leg 15a is reduced to about 1/10 according to the distance ratio, and the load borne by the load cell 10 is reduced.

For this reason, by using an inexpensive load cell 10 having a measurement range of about 1/10, the manufacturing cost can be reduced.

[0073]

Second Embodiment FIG. 6 shows a second embodiment of the present invention. The same or equivalent parts as those in the first embodiment will be described with the same reference numerals.

According to the second embodiment, the V-shaped arm 30 of the first embodiment is replaced by a substantially U-shaped arm.
A U-shaped arm 50 is used. That is, the U-shaped arm 50 also has the rotating shaft portions 51, 51 which are substantially the same as the rotating shaft portions 24, 24 at both open ends of the V-shaped arm 30, and has a distal end portion. A pressing projection is provided substantially at the center of the.

Reference numerals 53, 53 in FIG. 6 denote auxiliary arms provided with rotating shafts 54, 54 substantially similar to the auxiliary arms 29, 29 of the first embodiment.

Then, they are locked to each other by locking portions 55, 55 locked to the U-shaped arm 50 provided at the other end.

The other structure, operation, and effect are substantially the same as those of the first embodiment, and the description is omitted.

Although the first embodiment of the present invention has been described in detail with reference to the drawings, the specific structure is not limited to the first embodiment, and there are design changes and the like within a range not departing from the gist of the present invention. Even this is included in the present invention.

For example, in the first embodiment, the contact portion 31 provided on the upper surface of the inner position where the support leg portion 15a comes into contact with the rotation shaft portion 24 of the V-shaped arm 30 of the sensor link 22. Distance d from the rotating shaft portion 24 to the intervening portion of the weight sensor on the lower surface of the rotating end.
Is set to be about 10 times longer, but is not particularly limited thereto, and may be configured to have any ratio such as about 2 times, 3 times to 9 times, or 11 times or more.

Needless to say, the weight receiving surface member 15 may be a single plate-like or planar member without using the net-like member 18.

In the first embodiment, the open-sided corners 23 formed in a substantially V-shape are formed in a substantially U-shape that opens the lower side. However, the present invention is not limited to this. For example,
As shown in FIG. 7, the end portion 123 of the V-shaped arm 30 may be extended, and the rotating shaft portion 24 may be formed on the flat plate portion 123a which is the extension portion.

As shown in FIG. 8, a part of the tip of the substantially U-shaped corner 23 in FIG.
May be formed, and the rotating shaft portion 24 may be provided on the flat plate portion 223a which is an extension thereof.

Further, in the first embodiment, the support legs 15a are provided on the frame member 16 of the weight receiving surface member 15, and the support legs 15a contact the contact portion 31 of the sensor link 22.
Conversely, a boss member corresponding to the support leg 15a may be provided on the sensor link 22, and the tip of the boss member may be brought into contact with the frame member 16 of the weight receiving surface member 15 to support it.

[0084]

As described above, according to the first aspect of the present invention, when the occupant sits on the seat cushion, the weight receiving surface member laid below receives the weight of the occupant, and the weight receiving surface The weight is transmitted to the sensor link via a part of the member.

Therefore, the weight of the occupant may be reduced to a small number, for example, 1
With one weight sensor.

Further, the sensor link rotates around the rotation shaft provided at the corner, and swings the opposite rotation end downward. At this time, the distance from the rotation shaft portion, which is a fulcrum, is greater than the distance from the upper surface portion, which is a point of force, to the support leg contact portion, but the distance to the rotation end, which is the point of application to the weight sensor. Can be set long.

For this reason, the weight of the occupant sitting on the seat cushion is reduced in accordance with the distance ratio, and the measurement range of the weight sensor is narrow, for example, with one weight sensor.
A seated state and a non-seated state can be detected.

Therefore, good detection accuracy can be obtained without using a load cell having a large load capacity while suppressing an increase in manufacturing cost.

According to the second aspect of the present invention, since the weight receiving surface member can be formed independently, the assembling property is good.

Further, even if the weight receiving surface member provided independently is used as described above, the sensor link and the sensor link which are surely disposed below can be reliably provided without receiving the uneven weight. Since the weight can be transmitted to the weight sensor, better detection accuracy can be obtained.

[0091] According to the third aspect,
Since the weight receiving surface member has a frame member surrounding and forming the periphery of the weight receiving member in a substantially rectangular shape, and a net-like member stretched inside the frame member, the weight receiving surface member is formed independently. It is possible and has good assemblability.

Further, even if the weight of the occupant is applied to any part of the weight receiving surface material, the mesh member transmits the weight to the frame member almost uniformly. Then, the substantially equally distributed weights are transmitted to the sensor link from the supporting legs provided on the frame member having high rigidity.

Even if the weight receiving surface member independently provided is used, the sensor link and the weight sensor which are surely disposed below without the weight receiving surface material receiving the uneven weight are not inclined. Can transmit the weight to
Good detection accuracy is obtained.

According to the fourth aspect of the present invention, in the sensor link, the V-shaped arm is provided with the rotation shafts at both ends on the open side formed in a substantially V-shape, and at one end. Since the other end of the auxiliary arm forming the rotation shaft portion is locked to a part of the V-shaped arm, receiving the weight transmitted from the weight receiving surface member disposed above, Regardless of the weight applied to any of the arms, all the weights are converted into a pivoting operation about the pivot shaft of the V-shaped arm, and the lower surface of the other end of the V-shaped arm is substantially moved. Move vertically.

Therefore, the presence of the weight sensor at one point on the lower surface of the other end makes it possible to detect the occupant's seating. Therefore, a configuration using one weight sensor without using a plurality of weight sensors is provided. It is possible to suppress an increase in manufacturing cost.

[0096] According to the fifth aspect,
Receiving the weight transmitted from the weight receiving surface member, the weight is converted into a pivoting operation about the pivot shaft of the main arm, and the lower surface of the other end of the main arm is moved in a substantially vertical direction. In addition, since the sensor link does not protrude outside the seat cushion, it has a practically useful effect that the appearance is good and it does not become an obstacle.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a configuration of an occupant detection device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a weight receiving member in the occupant detection device according to the first embodiment of the present invention.

FIG. 3 is a perspective view illustrating a configuration of a seat mounting frame and a sensor link in the occupant detection device according to the first embodiment of the present invention.

FIG. 4 is a side view showing each arm of a sensor link used in the occupant detection device according to the first embodiment of the present invention.

FIG. 5 is an essential part enlarged perspective view for explaining a locked state of the V-shaped arm 30 and the auxiliary arm 29 in the occupant detection device according to the first embodiment of the present invention.

FIG. 6 is a schematic plan view illustrating a configuration of an occupant detection device according to a second embodiment of the present invention.

FIG. 7 is an enlarged perspective view of a main part illustrating a modified example of the occupant detection device of the present invention and illustrating a configuration of a corner 123 of a V-shaped arm 30.

FIG. 8 shows another modification of the occupant detection device of the present invention,
It is a principal part expansion perspective view explaining the structure of the corner part 223 of the character-shaped arm 30.

FIG. 9 is a block diagram illustrating a circuit configuration of a passenger seat airbag deployment device using a conventional occupant detection device.

FIG. 10 is a block diagram illustrating a circuit configuration of a passenger seat airbag deployment device using an occupant detection device.

[Explanation of symbols]

 Reference Signs List 9 seat portion 10 load cell (weight sensor) 11 passenger seat 14 seat cushion 15 weight receiving surface member 15a support leg portion 16 frame member 18 mesh member 18c corner portion 19 seat mounting frame 22 sensor link 22b locked portion 23 both end corners on open side Part (one of the corners) 24, 26 Rotating shaft part 25 One end corner (one of the corners) 29 Auxiliary arm 29a Lower end of the other end 30 V-shaped arm (main arm) 31, 32 Contact part 50 U-shaped arm (main arm)

Claims (5)

[Claims] A substantially planar weight receiving surface member is laid below a seat cushion, and a corner portion is pivoted through a rotation shaft portion above a seat mounting frame disposed on a vehicle floor. A sensor link to be supported is provided, and a part of the weight receiving surface member is brought into contact with an upper surface portion of the sensor link at an inner position from the corner, and furthermore, the seat mounting frame and a tip end of the sensor link. An occupant detection device characterized in that a weight sensor is interposed between the occupant detection device. 2. A support leg is provided on a part of the weight receiving surface member, and the support leg is provided in a convex shape at a portion corresponding to the vicinity of four corners of the lower surface of the weight receiving surface member. The occupant detection device according to claim 1, wherein: 3. The weight receiving surface member includes a frame member that surrounds and forms the periphery of the weight receiving member in a substantially rectangular shape, and a mesh member stretched inside the frame member. 3. The occupant detection device according to claim 2, wherein the frame member is formed integrally with a portion corresponding to the vicinity of the four corners of the mesh portion. 4. The sensor link according to claim 1, wherein said sensor link includes a main arm having said rotating shaft portion provided at both ends on an open side formed in a substantially V shape, and said rotating shaft portion being formed at one end and having the other end connected. 2. The weight sensor according to claim 1, further comprising: an auxiliary arm that is locked to a part of the main arm, wherein the weight sensor is interposed between the seat mounting frame and a lower surface of the other end of the main arm. The occupant detection device as described in the above. 5. The rotating shaft of the sensor link forms a fulcrum, a point at which a part of the receiving surface member comes into contact is a force point, and corresponds to a position of the weight sensor of the sensor link. The occupant detection device according to any one of claims 1 to 4, wherein the fulcrum, the force point, and the point of action are arranged inside the seat cushion by using a point at the tip as an action point.