JP3084084B2 - Automotive airbag equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a front seat in which a front seat is provided so as to be adjustable by a seat adjusting means, and the adjustment amount is controlled by an adjustment control means. The present invention relates to an airbag device for an automobile in which an airbag unit is provided on the back of a headrest or a seat back.

[0002]

2. Description of the Related Art Generally, in an automobile, an airbag unit having an inflator and an airbag is provided at a predetermined portion, and when a relatively large impact force acts on a vehicle body during a collision or the like, the vehicle is normally folded. 2. Description of the Related Art There is known an airbag device for an automobile in which an airbag is inflated by an explosion of an inflator, and the inflated airbag reduces impact force acting on an occupant in a vehicle compartment to protect the occupant.

[0003] In such a case, as an airbag device for a vehicle for protecting a rear passenger, for example, as described in US Pat. No. 3,779,577 and the drawings,
2. Description of the Related Art An airbag unit having an inflator and an airbag is provided on a rear portion of a seat back of left and right front seats.

[0004]

However, with such a structure in which the airbag unit is provided on the back side of the seat back of the front seat, a change in the state of the seat back of the front seat causes, for example, a change in the state of the front seat. , The distance between the airbag unit and the rear seat occupant changes, and the rear seat occupant may not be sufficiently restrained by the airbag. In addition, a similar problem occurs when the airbag unit is provided in the headrest.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an airbag device for an automobile capable of reliably restraining a rear occupant in a collision.

[0006]

According to a first aspect of the present invention, a front seat is provided so as to be adjustable by a headrest rotating means for adjusting a rotation amount of a headrest of the front seat, and the headrest rotating means is provided with a headrest rotating means. The adjustment amount is controlled by the adjustment control means, assuming an airbag device of an automobile in which an airbag unit is disposed on the headrest of the front seat or the back of the seatback, A seat adjustment amount detection sensor for detecting an adjustment amount by the headrest turning means, and an adjustment determining means for receiving an output from the seat adjustment amount detection sensor and determining whether the adjustment amount of the front seat is equal to or less than a predetermined value. Receiving the output of the adjustment determining means, when the rear seat occupant is seated, and when the adjustment amount of the front seat exceeds a predetermined value, the headrest pivoting hand by the adjustment control means. It regulates the adjustment, at the time of non-seating of the rear-seat occupant to the regulating and structure and an adjustment limiting means for releasing.

According to a second aspect of the present invention, the front seat is provided so as to be adjustable by a seat back adjusting means for adjusting a vertical movement amount of the seat back of the front seat, and the seat back adjusting means is controlled by an adjusting control means. The adjustment amount is controlled, and an airbag device of an automobile in which an airbag unit is disposed on the headrest of the front seat or the back of the seatback is assumed, and the seatback adjustment means of the front seat is provided. An adjustment amount detecting sensor for detecting an adjustment amount of the front seat, an adjustment determining means for receiving an output from the seat adjustment amount detection sensor and determining whether or not the adjustment amount of the front seat is equal to or less than a predetermined value; In response to the output of the determination means, when the rear seat occupant is seated and the adjustment amount of the front seat exceeds a predetermined value, the adjustment of the seat back adjustment means by the adjustment control means is regulated. And, a structure comprising an adjustment limiting means for canceled when unseated the rear-seat occupant to the regulating.

According to a third aspect of the present invention, the front seat is provided so as to be adjustable by headrest adjusting means for adjusting the amount of vertical movement of the headrest of the front seat, and the headrest adjusting means is adjusted by the adjustment control means. It is assumed that an airbag device of an automobile in which an airbag unit is disposed on the headrest of the front seat or the back of the seatback, and the amount of adjustment of the front seat by the headrest adjusting means is controlled. A sensor for detecting a seat adjustment amount to be detected, an adjustment determining means for receiving an output from the sensor for detecting the seat adjustment amount, and determining whether or not the adjustment amount of the front seat is equal to or less than a predetermined value; and an output of the adjustment determining means. When the rear seat occupant is seated and the adjustment amount of the front seat exceeds a predetermined value, the adjustment of the headrest adjustment means by the adjustment control means is regulated. And, a structure comprising an adjustment limiting means for canceled when unseated the rear-seat occupant to the regulating.

According to a fourth aspect of the present invention, the front seat is provided so as to be adjustable by a seat adjustment means, and the adjustment amount of the seat adjustment means is controlled by an adjustment control means. A seat adjustment amount detection sensor for detecting an adjustment amount of a front seat by a seat adjustment means, assuming an airbag device of an automobile in which an airbag unit is arranged on a headrest of a seat or a back surface of a seatback; Adjusting amount calculating means for receiving the output of the amount detecting sensor and calculating the adjusting amount of the rear seat; and receiving the output of the adjusting amount calculating means and following the adjustment of the front seat, the rear seat is moved to the front seat. The air conditioner further includes an adjustment control unit that adjusts the distance between the airbag unit disposed on the seat and the rear occupant so as to be substantially constant.

[0010]

According to the first to third aspects of the present invention, when the rear occupant is seated, the adjustment amount of the front seat is restricted to a predetermined value or less, and the distance between the airbag unit and the rear occupant is within a certain range. Inside. Therefore, the position of the front seat (and thus the airbag unit) with respect to the rear occupant is stable,
The performance of restraining the rear seat occupant by the airbag at the time of collision is good.
Such a restriction is released when the rear seat occupant is not seated, and can be adjusted in the same manner as a normal seat.

According to the fourth aspect of the invention, the rear seat is adjusted so that the distance between the airbag unit disposed on the front seat and the rear occupant is maintained substantially constant. Therefore, the restraint performance of the rear seat occupant by the airbag is not impaired.

[0012]

According to the first to third aspects of the present invention, the amount of movement of the front seat when the rear occupant is seated is restricted to a predetermined value or less. The position of the airbag unit) is stable, the rear seat occupant is excellently restrained when the airbag is activated, and the rear seat occupant can be reliably protected in the event of a collision.

According to a fourth aspect of the present invention, the rear seats follow the movement of the front seats, and the distance between the airbag unit disposed on the front seats and the rear occupant is maintained substantially constant. As a result, the rear seat occupant is excellently restrained when the airbag is activated, and the rear seat occupant can be reliably protected in the event of a collision.

[0014]

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

In FIG. 1, a part of a roof portion of an automobile is cut away, 1 is an automobile, 2, 2 are left and right front seats, and seat backs 2a, 2a, seat cushions 2b,
2b and headrests 2c, 2c. An airbag unit 4 is provided inside the headrest 2c.
5,5 are left and right rear seats, and seat backs 5a, 5
a, seat cushions 5b, 5b and headrest 5
c, 5c, and seat sensors 6A, 6B that are turned on when an occupant is seated are embedded in substantially the center of the seat back 5a and the seat cushion 5b.

A pair of acceleration-sensitive first impact detection sensors 7 and 7 are provided at the front end of the vehicle body, and another pair of acceleration-sensitive second impact detection sensors are provided at the vehicle body near the instrument panel 6. Sensors 8, 8 are provided respectively. The first impact detection sensor 7 is set to have relatively low sensitivity and is turned on even with a small impact force, while the second impact detection sensor 8 is set to have relatively high sensitivity and the impact force at the time of collision is equal to or more than a predetermined value. In this case, it is turned ON.

As shown in FIGS. 2 and 3, the airbag unit 4 has a metal inner casing member 21 having a rectangular opening 21a as viewed from the rear, and a synthetic resin outer casing member 22 having a U-shaped side view. Casing 20 made of
And an inflator 4 a provided in the casing 20.
And the airbag 4b and the like housed in the casing 20 in a folded state.

The outer casing member 22 is formed of a flexible film material and is externally fitted and fixed to the inner casing member 21 so as to close the opening 21a of the inner casing member 21 with the vertical wall portion 22a. The lower wall portion is fixed to the inner casing member 21 by a plurality of screws 24, and the upper, lower, left and right edges of the airbag 4 b are air-tightly fixed to the inner casing member 21 by the screws 24.

Perforations 22b are formed in the vertical wall portion 22a of the outer casing member 22 as shown by a one-dot chain line in FIG. Are provided with brackets 25, 25 having bolt holes 25a, 25a, respectively.

The inflator 4a is fixed to the left and right side walls of the inner casing member 21. In the inflator 4a, a firing device (not shown) which is activated by an output signal from a control unit 10 described later is provided. When the device is operated, a large amount of gas is instantaneously generated from the inflator 4a, and the pressure of the gas breaks through the perforations 22b of the outer casing member 22 so that the airbag 4b is inflated and deployed. Note that a plurality of vent holes are formed in the airbag 4b, and gas is exhausted through the vent holes to form the airbag 4b.
Is contracted in a predetermined time after the expansion and deployment.

If the vehicle collides with an impact force equal to or greater than a predetermined value at the time of the collision, the collision is determined based on signals from the first and second impact detection sensors 7 and 8, and the airbag unit 4 is activated at a predetermined timing. And an airbag unit 4 corresponding to the rear seat 5 in which the occupant is seated
Airbag 4b is inflated and deployed to restrain the occupant. Therefore, the occupant is prevented from colliding with the seat bag 2a of the front seat 2. The airbag 4b has a rear seat 5
Since the headrest 2c is inflated and deployed from the position corresponding to the chest of the occupant sitting on the occupant, the occupant's head can be reliably restrained. Thereafter, the airbag 4b contracts due to the gas leaking from the vent hole.

The front seat 2 is slidable in the vehicle longitudinal direction. Specifically, for example, FIG.
Can be slid by a slide mechanism shown in FIG. The seat cushion 2b of the front seat 2 is
A pair of lower rails 31, 31 are disposed in parallel on the left and right side edges of the seat cushion 2b in the vehicle front-rear direction, and each lower rail 31 is connected to the floor via an elastic support member 32 supporting the front and rear ends of the lower rail 31. It is fixed to the panel.

The lower rail 31 is formed by integrally forming a flange portion along both sides of the upper end of the groove-shaped cross section. Each lower rail 31 has an upper rail 33 having a C-shaped cross section so as to cover the upper surface and both flange portions. Are slidably engaged with each other via bearings and rollers, and a seat cushion 2b of the front seat 2 is fixedly supported on the pair of left and right upper rails 33.

In order to drive the upper rail 33 in the front-rear direction of the vehicle, screw shafts 34 are arranged in parallel near the inside of each lower rail 31 along the entire length of the lower rail 31. Both ends of each screw shaft 34 are elastically supported via each elastic support member 32.

Further, a box-shaped gear mounting portion 35 is provided inside the longitudinal middle portion of each of the upper rails 33, and a nut is screwed to the screw shaft 34 in the gear mounting portion 35. A gear is screwed to the front end surface and the rear end surface of the nut, and a rotation transmission shaft 36 for rotating and driving the nut is provided between the gear mounting portions 35 of the left and right upper rails 33. The provided worm gear meshes with each nut so as to be rotationally transmittable, and the rotational transmission shaft 3
6, both shaft ends are supported by a pair of left and right upper rails 33, respectively.

A slide motor 37 for rotating the rotary transmission shaft 36 is interposed on the rotary transmission shaft 36. The slide motor 37 is a fixed member 38 through which the rotary transmission shaft 36 is inserted. It is non-rotatably connected to the side wall of the gear mounting portion 35.

Further, the seat back 2 of the front seat 2 is provided.
b is rotatable in the front-rear direction of the vehicle by a knuckle motor 44, and its mechanism will be described with reference to FIG.

A fixed arm 41 is attached to the seat cushion 2a of the front seat 2, and a tilt arm 42 is attached to the seat back 2b. A seat back drive mechanism 43 is interposed between the joints of the arms 41 and 42. I have.

The seat back drive mechanism 43 has a normal rotation,
A worm 45 connected to the main shaft end of the knuckle motor 44 that rotates in reverse meshes with a worm gear 46 that is supported by the fixed arm 41, and a displacement gear 47 meshes with a gear portion on the opposite surface of the worm gear 46. . This displacement gear 47
Is provided with a large-diameter gear 48 and a small-diameter gear 49 and is pivotally supported by the tilting arm 42.
6 and the small-diameter gear 49 meshes with the arcuate gear 50 formed on the fixed arm 41. This arc gear 50
A gear is formed on one side of the arc-shaped long hole, and the displacement gear 47 is formed.
Are displaceably provided on an arc line.

Thus, based on the output of the knuckle motor 44, the displacement gear 47 rotates and is displaced on an arc line along the arc gear 50 around the axis of the worm gear 46 as a fulcrum. Accordingly, the seat back 2b via the tilt arm 42 integrated with the displacement gear 47 can be freely tilted in the front-rear direction of the vehicle.

Although not specifically shown, the rear seat 5 is also slidable and reclineable in the vehicle longitudinal direction, like the front seat 2. Both the front seat 2 and the rear seat 5 can be moved up and down in the vehicle body by motors 61 and 61A (see FIGS. 13 and 16) via a link mechanism and the like.

As shown in FIG. 6, a gear 51 fixed to the headrest 2c is meshed with a gear 53 formed at the upper end of the headrest pole 23, and the headrest 2c is The head 54 is rotated in the vehicle longitudinal direction by driving the motor 54 by meshing the gear 55 that is rotationally driven by the gear 54. At the same time, headrest 2c
A tooth portion 56 is formed on the headrest pole 23, and a gear 57 is meshed with the tooth portion 56.
The headrest 2c can be moved up and down with respect to the seat back 2a (seat back frame 60) by meshing a gear 59 which is rotationally driven by the gear 8 and rotationally driving the motor 58.

In order to detect the state of the front seat 2, various sensors 71, 76, 81, 91 and 95 are provided, which are configured as follows. (1) A seat back rotation angle detection sensor 71 for detecting the rotation angle of the seat back 2a of the front seat 2 As shown in FIG. 8, hinge means for rotatably connecting the seat back 2a and the seat cushion 2b. A seatback rotation angle detection sensor 71 for detecting the rotation angle (reclining angle) of the seatback 2a is provided for the seatback 72.

This sensor 71 is connected to the seat cushion 2b.
The fixed terminal 71a is provided on the side hinge member 72a, and the seat back 2a is provided on the seat back 2a side hinge member 72b.
Movable terminal 7 disposed on a circle around the center of rotation of
1b, the movable terminal 71b is rotated by the rotation of the seat back 2a, and the point of contact with the fixed terminal 71a changes according to the rotation angle of the seat back 2a, whereby the fixed terminal 71a and the movable terminal 71b are rotated. Since the resistance value changes during the period, the change is read by the resistance detector 71c.
Since the change in the resistance corresponds to the rotation angle of the seat back 2a, the rotation angle of the seat back 2a is detected through the change in the resistance. (2) Seat slide amount detection sensor 76 for detecting the front and rear slide amount of the front seat As shown in FIG. 9, a fixed terminal 76a is provided on a lower rail 78 supported via support members 77, 77 on the floor side. A movable terminal 76b is provided on an upper rail 79 that slides in the front-rear direction with respect to the lower rail 78, and a change in resistance therebetween is detected by a resistance detector 76c to detect the amount of front-rear sliding. (3) A seat back vertical movement amount detection sensor 81 for detecting the vertical movement amount of the seat back 2a. As shown in FIG. 10, an upper rail 84 slidable with respect to a lower rail 83 supported on the floor side via support members 82, 82. A fixed terminal 81a is provided on the upper rail 84, and a seat cushion (for example, the seat cushion frame 8
A movable terminal 81b is provided in 6), and a change in resistance between them is detected by a resistance detector 81c, whereby the vertical amount of the seat cushion 2b and thus the seat back is detected. (4) Headrest rotation angle detection sensor 91 for detecting the rotation angle of headrest 2c As shown in FIG. 11, a fixed terminal 91a is provided at the upper end of the headrest pole 23 serving as the rotation center of the headrest 2c. Headrest 2
On the c side (for example, a headrest frame), there is provided a movable terminal 91b disposed on a circumference centered on the rotation center. The resistance value between the two terminals 91a and 91b changes, and the change is read by the resistance detector 91c to detect the rotation angle of the headrest 2c. (5) Headrest vertical movement amount detection sensor 95 for detecting the vertical movement amount of the headrest 2c As shown in FIG. The movable terminal 91b in which the fixed terminal 91a contacts the headrest pole 23 of 2c.
And a change in resistance between them is detected by the resistance detector 91c to detect the vertical amount of the headrest 2c.

The above sensors 71, 76, 81,
Signals from 91 and 95 are transmitted to the control unit 100. In the control unit 100, when the rear occupant is seated, the adjustment amount of the front seat 2, that is, the drive amount of the motors 37, 44, 54, 58 and 61 is determined. When the rear passenger is not seated, the restriction is released and the control is performed so that the adjustment can be freely performed.

That is, the control unit 100
As shown in FIGS. 13 and 14, adjustment operation means for adjusting the seat slide amount, the reclining angle of the seat back 2a, the turning angle of the headrest 2c, the elevation amount of the headrest 2c, the elevation amount of the front seat 2 and the like. In response to the signal from 101, the motors 37, 44, 54, 58, and 61 are driven in accordance with the adjustment operation amount of the front seat 2 to drive the front seat 2
Adjustment control means 102 for adjusting the sensor, various sensors 71,
Front seat 2 after receiving signals from 76, 81, 91, 95
Adjustment determining means 103 for determining whether or not the adjustment amount is smaller than a predetermined value, and seating determining means for receiving a signal from the seat sensors 6A and 6B and determining whether or not the occupant is seated on the rear seat 5. 104, and an adjustment regulating unit 105 that receives signals from the adjustment judging unit 103 and the seating judging unit 104 and regulates the adjustment of the front seat 2 by the adjustment control unit 102 when the adjustment amount exceeds a predetermined value. The adjustment control means 102 includes motors 37, 44, 54, 58,
61, the seat slide amount, the seat back 2a
, The angle of rotation of the headrest 2c, the amount of elevation of the headrest 2c, and the amount of elevation of the seat 2. Further, without providing the seat determination means 104, that is, regardless of whether or not the rear passenger is seated, the front seat 2
Can be controlled so that the adjustment amount of the constant is always equal to or less than a predetermined value.

Therefore, the control by the control unit 100 is performed as shown in FIG.

When starting, it is first determined whether or not the front seat 2 has been adjusted (step S1).

If the front seat 2 has been adjusted, it is determined whether or not the occupant is sitting on the rear seat 5 (step S2). If there is no adjustment of the front seat 2, this determination is repeated.

When the occupant is seated in the rear seat 5, it is determined whether the adjustment amount is equal to or less than a predetermined value (step S3). Since there is no effect on the protection of the rear occupant, the front seat 2 is adjusted (step S4), and the routine returns. on the other hand,
If it exceeds the predetermined value, the adjustment amount of the front seat 2 is regulated to a predetermined value or less (step S5), and the routine returns. If the rear seat occupant is not seated, there is no need to regulate the adjustment amount, so the front seat 2 is adjusted (step S4) and the routine returns.

In the above embodiment, the adjustment amount of the front seat 2 is regulated to a predetermined value or less, and the regulation is released when the rear occupant is not seated. The rear seat 5 is adjusted by an adjustment amount corresponding to the adjustment amount of the front seat 2 (the distance between the airbag unit 4 disposed on the front seat 2 and the rear occupant is maintained substantially constant. Adjustment).

That is, in this case, FIG. 16 and FIG.
As shown in FIG. 7, the control unit 100A includes a seat determination unit 11 for determining whether or not a rear passenger is seated.
0, an output of the seat determination means 110, an adjustment amount detecting means 111 for detecting an adjustment amount of the front seat 2 when the rear seat occupant is seated, and an adjustment of the rear seat receiving the output of the adjustment amount detecting means 111 Adjustment amount calculating means 112 for calculating the amount, and a motor 37 corresponding to the motors 37, 76, 81, 91, 95 of the front seat 2 receiving the output of the adjustment amount calculating means 112.
A, 76A, 81A, 91A, and 95A are driven to control the adjustment of the rear seat 5 by following the adjustment of the front seat 2 by the adjustment amount corresponding to the adjustment amount of the front seat 2. Adjustment control means 113 for performing the adjustment.

Therefore, the control unit 100
According to the control by A, as shown in FIG. 18, when starting, it is determined whether or not the seat adjustment of the front seat 2 is performed (step S11). While adjusting the sheet 2 (step S
12) If the front seat 2 is not the seat adjustment, the routine returns.

After adjusting the front seat 2, it is determined whether or not the rear occupant is seated (step S13). If the rear occupant is seated, the seat adjustment amount of the front seat 2 is detected. Then, following the adjustment, the rear seat 5 is adjusted by an adjustment amount corresponding to the adjustment amount of the front seat 2 (step S15). If the rear occupant is not seated, the routine returns. .

Therefore, the interval between the airbag unit 4 and the rear seat occupant is always maintained at a predetermined interval when the rear seat occupant is seated, and the airbag unit 4 functions effectively.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an automobile.

FIG. 2 is a front view of the airbag unit.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view of a seat slide mechanism of a front seat.

FIG. 5 is a perspective view of a reclining mechanism for a front seat.

FIG. 6 is a schematic view of a headrest rotating mechanism.

FIG. 7 is a schematic diagram of a headrest elevating mechanism.

FIG. 8 is an explanatory view of a reclining angle detecting means of the seat back.

FIG. 9 is an explanatory diagram of a means for detecting a sliding movement amount of a front seat.

FIG. 10 is an explanatory diagram of a means for detecting the amount of elevation of the front seat.

FIG. 11 is an explanatory diagram of a headrest rotation amount detection unit.

FIG. 12 is an explanatory diagram of a headrest elevation amount detecting means.

FIG. 13 is a diagram showing the relationship between the front and rear seats and the control unit.

FIG. 14 is a block diagram of a control unit.

FIG. 15 is a flowchart illustrating a control flow.

FIG. 16 is a view similar to FIG. 13 for another embodiment.

FIG. 17 is a view similar to FIG. 14 for another embodiment.

FIG. 18 is a view similar to FIG. 15 for another embodiment.

[Explanation of symbols]

1 Car 2 Front seat 2a Seat back 2b Headrest 4 Airbag unit 37 Slide motor (Seat slide means) 44 Knuckle motor (Seat back rotation means) 54 Motor (Headrest rotation means) 58 Motor (Headrest adjustment means) (Headrest Lifting means) 61 Motor (seat back adjusting means) (seat back elevating means) 71 Seat back rotation angle sensor (seat adjustment amount detection sensor) 76 Seat slide amount detection sensor (seat adjustment amount detection sensor) 81 Seat back vertical movement amount detection Sensor (Seat adjustment amount detection sensor) 91 Headrest rotation angle detection sensor (Seat adjustment amount detection sensor) 95 Headrest vertical movement amount detection sensor (Seat adjustment amount detection sensor) 100 Control unit 100A Control unit 102 Adjustment control means 103 Adjustment determination means 105 Adjustment regulator Step 112 Adjustment amount calculation means 113 Adjustment control means

────────────────────────────────────────────────── ─── Continuation of the front page (72) Isao Hirashima 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Co., Ltd. (56) References JP-A-63-141840 (JP, A) JP-A-4 -166455 (JP, A) Jikken Sho 51-35730 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60N 2/00-2/54 B60R 21/16-21/32

Claims (4)

(57) [Claims] 1. A front seat is provided so as to be adjustable by a headrest turning means for adjusting a rotation amount of a headrest of the front seat, and the adjustment amount of the headrest turning means is controlled by an adjustment control means. In an airbag device for an automobile in which an airbag unit is disposed on the headrest of the front seat or the back of the seatback, a seat adjustment amount for detecting an adjustment amount of the front seat by the headrest rotating means. A detection sensor, an adjustment determination unit that receives an output from the seat adjustment amount detection sensor, and determines whether an adjustment amount of the front seat is equal to or less than a predetermined value; When the amount of adjustment of the front seat exceeds a predetermined value when the occupant is seated, the adjustment of the headrest turning means by the adjustment control means is restricted, and the restriction is applied to the rear occupant. An airbag device for an automobile, comprising: an adjustment restricting unit that is released when the vehicle is not seated. 2. The front seat is provided so as to be adjustable by a seat back adjusting means for adjusting a vertical movement amount of the seat back of the front seat, and the adjustment amount is controlled by an adjustment control means. In an airbag device for an automobile, in which an airbag unit is disposed on a headrest of the front seat or an airbag unit on the back of the seatback, a seat for detecting an adjustment amount of the front seat by the seatback adjusting means is provided. An adjustment amount detection sensor, an adjustment determination unit that receives an output from the seat adjustment amount detection sensor and determines whether an adjustment amount of the front seat is equal to or less than a predetermined value, and receives an output of the adjustment determination unit, When the rear seat occupant is seated, when the adjustment amount of the front seat exceeds a predetermined value, the adjustment of the seat back adjustment means by the adjustment control means is regulated, and the regulation is applied to the rear seat. An airbag device for an automobile, comprising: an adjustment restricting means for releasing when an occupant is not seated. 3. The front seat is provided so as to be adjustable by a headrest adjusting means for adjusting a vertical movement amount of a headrest of the front seat, and the adjustment amount is controlled by the adjustment control means. In an airbag device of an automobile in which an airbag unit is disposed on the headrest of the front seat or on the back of the seatback, a seat adjustment amount detection sensor for detecting an adjustment amount of the front seat by the headrest adjusting means. Adjustment determination means for receiving an output from the seat adjustment amount detection sensor and determining whether or not the adjustment amount of the front seat is equal to or smaller than a predetermined value; During seating, when the adjustment amount of the front seat exceeds a predetermined value, the adjustment of the headrest adjustment means by the adjustment control means is regulated, and the regulation is restricted to the rear seat. An airbag device for an automobile, comprising: an adjustment restricting means for releasing when an occupant is not seated. 4. The front seat is provided so as to be adjustable by a seat adjustment means, and the adjustment amount of the seat adjustment means is controlled by an adjustment control means. receiving the airbag apparatus of a vehicle airbag unit is disposed, the front seat, a seat adjustment amount detecting sensor that detects an adjustment amount by the seat adjusting means, the output of the seat adjustment amount detection sensor, after and adjustment amount calculating means for calculating an adjustment amount of seat, Airbus which receives the output of the adjustment amount calculating means, the rear seat to follow before the adjustment of seat, disposed on the front seat
The distance between the bag unit and the rear seat occupant is kept almost constant
An airbag device for an automobile, comprising: an adjustment control unit for performing adjustment in the above manner .