JP2007153066A - Method and device for controlling movement of vehicular seat headrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a shearing force acting on the neck of a seated occupant due to a collision between the neck of the seated occupant and the headrest when a rear-end collision occurs. <P>SOLUTION: In this method for controlling movement of vehicular seat headrest, a headrest 4 receives the head h of the seated occupant P on a seat 1. This method includes the following three steps: a first step of moving a head receiving section 12 proximity to a standby position (indicated by solid line) where it comes into contact with the head h when occurrence of the rear-end collision is detected; a second step of temporarily receiving an impact force applied to the head h caused by the occurrence of the rear-end collision at the standby position; and a third step of receiving the impact force applied to the head h at a receiving position (indicated by imaginary line) by moving the head receiving section 12 rearward in an acting direction of the impact force at a predetermined collision period after completion of the second step. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a headrest movement control method and a movement control device for a vehicle seat. More particularly, the present invention relates to a vehicle seat headrest movement control method and a movement control device for receiving a head of a seat occupant with a headrest at the time of a rear-end collision of the vehicle.

  Conventionally, there is a headrest of a vehicle seat in which a head receiving portion that receives the head of a seat occupant can be moved toward the position of the head. For example, Patent Document 1 discloses a technique for predicting or detecting a rear collision and moving the headrest portion of the headrest toward the position of the seated person's head when the rear collision occurs. . In this disclosure, before the head of the seated person collides with the headrest at the time of the rear collision of the vehicle, the headrest portion of the headrest is moved forward and brought into a state of being brought close to or in contact with the head. As a result, when the rear collision of the vehicle occurs, the head of the seated person can be received by the headrest at a relatively early stage, so that the whipping phenomenon of the cervical spine can be prevented.

International Publication No. 05/073019 Pamphlet

  However, in the above-described conventional technology, a relative shift in the front-rear direction may occur between the position where the head of the seated person is received and the position where the chest is received by the seatback due to the forward movement of the headrest. . Then, when a relative receiving position shift occurs between the head and the chest, a load of shearing force may act on the neck.

  The present invention was devised as a solution to the above-described problems, and the problem to be solved by the present invention is that the head of the seated person and the headrest collide when a vehicle rear-end collision occurs. It is to reduce the load of the shearing force on the acting neck.

In order to solve the above-described problems, the vehicle seat headrest movement control method and movement control apparatus of the present invention employ the following means.
First, a first invention is a vehicle seat headrest movement control method for receiving a head of a seat occupant by a headrest at the time of a vehicle rear-end collision. When a vehicle rear-end collision is predicted or detected, A first step in which a part or the whole is moved closer to a standby position close to or in contact with the head of the seated person, and a head that has collided with the rear impact of the vehicle at the standby position of the first step The second step for temporarily receiving the impact force and the passage of the impact force acting after the second step after the second step, a part or the whole of the headrest is retracted and moved in the direction of the impact force. And a third step of receiving the impact force of the head at the receiving position.
According to the first aspect of the invention, at the time of a rear-end collision of the vehicle, the first step causes a part or the whole of the headrest to be moved closer to the standby position where the headrest approaches or contacts the seated person's head. Therefore, at the time of rearward collision of the vehicle, the reception time when the seated person's head is received in the second step is brought closer to the reception time of the chest that is received by the seat back prior to this. Then, after a predetermined time has elapsed while the impact force of the head is being received, the position where the head is received is moved to the receiving position by the third step. Thereby, the impact force of the head is received at a position close to the receiving position of the chest by the seat back. That is, compared with the case where the impact force of the head is received at the standby position, the relative displacement in the front-rear direction that occurs between the reception position of the chest is reduced, and the action of the shear force applied to the neck is reduced. Is reduced.

Next, the second invention is a headrest movement control device for a vehicle seat that moves a part or the whole of the headrest in the direction of the head of the seat occupant when a rear collision of the vehicle is predicted or detected. A headrest body for receiving the head of the seated person, a driving means for moving the headrest body or a part thereof close to the head of the seated person, and a control device for controlling the operation of the driving means. When the apparatus predicts or detects a rear-end collision of the vehicle, the device controls the driving means to bring the headrest body or a part thereof close to or in contact with the head before the head of the seated person collides with the headrest body. Moves the vehicle closer to the standby position, temporarily receives the impact force of the head that collided with the rear impact of the vehicle at the standby position, and withdraws after a predetermined time while the impact force is applied. It means a headrest body or a part thereof is retracted move in the direction of action of the impact force by, characterized in that cause receiving the impact force of the head at the receiving position is retracted moving.
According to the second aspect of the present invention, the seated person's head is received by the headrest body at the standby position by the operation control of the drive means by the control device at the time of the rear collision of the vehicle. Thereby, the receiving time at which the head is received is brought closer to the receiving time at the chest that is received by the seat back prior to this. In addition, after a predetermined time has elapsed while the impact force on the head is received, the position where the seated person's head is received is changed by the retracting means, and the impact force on the head is received by the seat back on the chest. It is received at a receiving position close to the position. As a result, compared with the case where the impact force of the head is received at the standby position, the relative displacement in the front-rear direction that occurs between the reception position of the chest is reduced, and the action of the shearing force applied to the neck is reduced. Is done.

Next, a third invention is characterized in that, in the second invention described above, the retracting means is a reverse drive of a driving motor provided in the driving means.
According to the third aspect of the invention, the headrest body or a part thereof moves in the retreat direction opposite to the approach movement direction by driving the drive motor in the reverse direction.

Next, according to a fourth aspect, in the second aspect described above, the retracting means reduces the braking force of the driving motor by changing the energization state to the driving motor provided in the driving means after a predetermined time has elapsed. The headrest body or a part of the headrest body is pushed back by the action of the impact force received from the head and retreats to the receiving position.
According to the fourth aspect of the invention, by reducing the braking force of the driving motor, the headrest body or a part thereof is pushed back by the action of the impact force received from the head and retracts to the receiving position.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect of the present invention, when a vehicle rear-end collision occurs, the load of the shearing force on the neck that acts when the head of the seated person collides with the headrest can be reduced by each step. .
Furthermore, according to the second invention, when a vehicle rear-end collision occurs, the retracting means can reduce the load of the shearing force acting on the neck that acts when the head of the seated person collides with the headrest. .
Furthermore, according to the third aspect of the present invention, the position for receiving the head can be retracted to the receiving position by the operation control for driving the driving motor having the existing configuration in the reverse direction.
Further, according to the fourth aspect of the present invention, the position for receiving the head is retracted to the receiving position in response to the impact force of the head by the operation control for reducing the braking force of the drive motor of the existing configuration. Can do. In particular, even when the impact speed of the head is relatively high, the headrest can be retreated in response to the impact speed.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

  First, a headrest movement control method and a movement control device for a vehicle seat according to a first embodiment will be described with reference to FIGS. FIG. 1 is a side view showing a schematic configuration of a headrest movement control device for a vehicle seat. FIG. 2 is a side view showing the sitting posture state of the seated person P and the operating state of the headrest 4. FIG. 3 is a side view showing the internal structure of the headrest body 10 and the configuration of the driving device 20. FIG. 4 is an enlarged perspective view of a main part showing the configuration of the driving device 20. FIG. 5 is a block diagram showing a system of the headrest movement control device. FIG. 6 is a flowchart showing a processing procedure of the headrest movement control device. FIG. 7 is a graph showing an example of the relationship between the head G and chest G and the NIC applied to the seated person when a vehicle collision occurs. Hereinafter, the headrest movement control device for a vehicle seat will be described simply as a headrest device.

The headrest device of the present embodiment is provided in a vehicle seat 1 as well shown in FIG. The seat 1 includes a seat back 2 serving as a backrest portion of the seated person P, a seat cushion 3 serving as a seating portion, and a headrest 4 serving as a receiving portion for the head h.
Specifically, as shown by the solid line state in FIG. 2, the headrest 4 is fixed by inserting the two stays 14 attached to the legs of the headrest body 10 into the upper surface side of the seat back 2. Here, the headrest 4 is set to a position where the head h hits when the seated person P is in a sitting posture leaning on the seat back 2. That is, the position in the front-rear direction where the head h is received by the headrest 4 is set to be substantially the same position as the position where the chest c is received by the seat back 2. Thereby, the seated person P can be seated on the seat 1 in a natural posture state.

However, the sitting posture of the above-mentioned seated person P is actually leaned around the waist w on the seat back 2 as shown by the solid line state in FIG. Or the headrest 4 is often in a posture state. Accordingly, when a rear collision of the vehicle occurs in such a floating posture state, the chest c and the head h that are located away from the seat back 2 and the headrest 4 are caused to move to the seat back 2 and It is urged toward the headrest 4 and hits strongly. Specifically, when a vehicle rear-end collision occurs, first, the chest c is urged toward the seat back 2 in front of the head h and hits this. Next, the head h is urged toward the headrest 4 and hits it. Therefore, if the timing at which the impact force is received is different, the head h may be shaken in the front-rear direction, leading to whipping of the cervical spine.
Here, NIC is known as one index for evaluating whipping damage of the cervical spine. In this evaluation index by NIC, as can be seen from the relationship shown in FIG. 7, the chest G (energized acceleration indicated by a two-dot chain line) with respect to the head G (energized acceleration indicated by a broken line) applied at the time of rearward collision of the vehicle. ) The greater the amount of swirling, the easier it is to cause cervical lashing damage. Therefore, reducing the region where the chest G exceeds the head G is effective in preventing the whipping phenomenon of the cervical spine.

Therefore, in the headrest device of the present embodiment, as indicated by the phantom line in FIG. 2, before the chest c and the head h are urged rearward in the event of a vehicle rearward collision, The (head receiving part 12) is moved closer to the standby position where it contacts the head h. Thereby, the head h can be received by the headrest 4 at a relatively early stage when the rear collision of the vehicle occurs. That is, the time when the head h is received can be made closer to the time when the chest c is received. To explain this in the relationship of FIG. 7, the time axis (horizontal axis) where the head G rises is brought closer to the time axis where the chest G rises. Thereby, the area | region where the chest G exceeds the head G can be reduced, NIC can be reduced, and the whipping phenomenon of a cervical spine can be prevented effectively.
However, on the other hand, as shown in the phantom line state of FIG. 2, the headrest 4 is moved forward alone as described above, so that the head h is received by the headrest 4 and the chest c There may be a relative displacement in the front-rear direction between the position where it is received. In such a case, the action distribution of the impact force is deflected between the head h and the chest c, and a shear force load is applied to the neck n located therebetween. Here, Nkm is known as one index for evaluating the load of the shearing force applied to the neck n. According to this evaluation index, the load of the shearing force applied to the neck n is said to act with a time delay from the action of the NIC described above. In order to reduce the load of the shearing force applied to the neck n, it is effective to reduce the relative displacement in the front-rear direction between the position where the head h is received and the position where the chest c is received. There is.

Therefore, in this headrest device, the headrest 4 is moved and controlled as follows in order to satisfy the NIC and Nkm evaluation indices.
That is, when a rear collision of the vehicle occurs, first, the head receiving portion 12 of the headrest 4 at the solid line position (initial position) in FIG. 2 is moved to the standby position (virtual line position) that contacts the head h of the seated person P. Let me. As shown well in FIG. 1, the impact force of the head h that has collided with the rearward collision of the vehicle is temporarily received by the headrest 4 in the standby position (solid line position). In this state position, the impact force of the head h is received for a certain time. Thereby, the impact force of the head receiving part 12 can be received until the head G exceeds the chest G (refer FIG. 7). When the head G exceeds the chest G, the receiving position (virtual line position) in which the head receiving part 12 of the headrest 4 in the standby position (solid line position in FIG. 1) is retracted toward the rear of the seat 1. ). Thereby, the relative shift | offset | difference of the front-back direction between the position where the head h is received by the headrest 4, and the position where the chest part c is received by the seat back 2 can be reduced. Then, the subsequent impact force of the head h is received at the retracted receiving position (virtual line position). By doing so, it is possible to provide support that satisfies both the prevention of the whipping phenomenon of the cervical spine and the reduction of the load of the shearing force applied to the neck n.
Hereinafter, the configuration of the headrest device will be described in detail.

First, the headrest body 10 will be described.
That is, the headrest main body 10 is formed by dividing a base 11 for attaching the stay 14 and a head receiving portion 12 for receiving the head h in the front-rear direction, as well shown in FIG. The base portion 11 and the head support portion 12 are connected by a driving device 20 configured to be able to expand and contract. Here, the operation of the drive device 20 is controlled by the control device 26, and as shown by the solid line state and the virtual line state in the figure, the swing links 21, 22 assembled in an X shape are connected. A motion of swinging around the pin 23 is performed. Thereby, the rocking links 21 and 22 move like scissors opening and closing movements, and the head receiving part 12 attached to the front end side thereof is relatively relative to the base part 11 attached to the rear end side. Move away or move closer. Here, the driving device 20 corresponds to the driving means of the present invention.

Here, the base 11 includes a mounting bracket 11a made of a metal plate, a pad 11b integrally attached to the mounting bracket 11a, and a skin 11c that covers the pad 11b to the outside.
Specifically, as shown in FIG. 4, the mounting bracket 11 a is formed in a U shape, with the ends on both sides thereof bent forward. As well shown in FIG. 3, two stays 14 are fitted and integrally attached to the legs of the mounting bracket 11a.
Next, the pad 11b is formed by foaming urethane resin, and is integrally attached to the back surface of the mounting bracket 11a.
Next, the skin 11c is stretched so as to cover the entire pad 11b, and each peripheral portion thereof is fixed to the mounting bracket 11a.
Further, side wall members 11e that cover both sides of the base portion 11 to the outside are attached to both outer side portions of the mounting bracket 11a. The side wall member 11e is formed in a plate shape with resin.

Next, the head receiving part 12 has a configuration substantially corresponding to the base part 11. That is, it has the mounting bracket 12a which consists of a metal plate, the pad 12b integrally attached to the mounting bracket 12a, and the skin 12c which coat | covers the pad 12b with respect to the exterior.
Specifically, as shown in FIG. 4, the mounting bracket 12 a is formed in a U shape by bending the ends on both sides toward the rear.
Next, as well shown in FIG. 3, the pad 12b is formed by foaming urethane resin, and is integrally attached to the front side surface of the mounting bracket 12a.
Next, the skin 12c is stretched so as to cover the entire pad 12b, and each peripheral portion thereof is fixed to the mounting bracket 12a.
Side wall members 12e that cover both sides of the head receiving portion 12 to the outside are attached to both outer side portions of the mounting bracket 12a. The side wall member 12e is formed in a plate shape with resin. Here, the installation dimension of the side wall member 12e is slightly smaller than the installation dimension of the side wall member 11e attached to the base 11, and is arranged so as to be sandwiched between the side wall members 11e. Therefore, when the head receiving portion 12 moves away from the base portion 11, the side wall member 12e moves so as to slide the side wall member 11e and the plate surface. The side wall member 12e is accommodated so as to be fitted between the side wall members 11e when the head receiving part 12 moves closer to the base part 11.

  Here, between the base part 11 and the head receiving part 12, the shielding sheet 13 which covers the internal space of the upper surface side exposed when these mutually move apart is attached. Specifically, the shielding sheet 13 is formed of a flexible cloth-like member, and is fixed to the upper end surface portion of the base portion 11 and the upper end surface portion of the head receiving portion 12. In the contracted state (the phantom line state in FIG. 3) before the head receiving part 12 is moved away, the shielding sheet 13 is in a stored state folded between the base part 11. Then, by moving the head receiving portion 12 away, the shielding sheet 13 is developed to cover the space between the base portion 11 and the head receiving portion 12 from the upper surface side.

Next, the drive device 20 will be described.
That is, the drive device 20 includes swing links 21 and 22, a connecting shaft 24, a drive motor 25, and a control device 26 as well shown in FIG. 4.
Specifically, the swing links 21 and 22 are provided as a pair on both outer side portions of the headrest body 10. These swing links 21 and 22 are connected to each other at their center portions by a connecting pin 23 so as to be rotatable. The front and rear end portions of the swing link 21 are rotatably connected to the mounting bracket 11a of the base portion 11 and the mounting bracket 12a of the head support portion 12 by pins 21a and 21b, respectively. The front and rear ends of the swing link 22 are connected to the mounting bracket 11a of the base portion 11 and the mounting bracket 12a of the head receiving portion 12 so as to be slidable in the vertical direction by pins 22a and 22b, respectively. Yes. Specifically, the front end side pin 22a is assembled in a vertically long slot 12d formed in the mounting bracket 12a so as to be slidable. The pin 22b on the rear end side is assembled so as to be slidable in a vertical hole 11d formed in the mounting bracket 11a.
Next, the connecting shaft 24 connects the swing links 22 arranged opposite to each other at the position of the pin 22b on the rear end side. As a result, the opening and closing movements of the swing links 21 and 22 arranged opposite to each other are synchronized.
Next, the drive motor 25 is provided fixed to the mounting bracket 11 a of the base 11. The drive motor 25 rotates forward and backward based on operation control from the control device 26. Then, in accordance with the forward / reverse movement, the feed screw 25a connected thereto is moved in the vertical direction shown in FIG. Here, the lower end of the feed screw 25 a is connected to the connecting shaft 24. Therefore, the drive shaft 25 can be moved forward and backward to move the connecting shaft 24 up and down to open and close the swing links 21 and 22. Here, the open / close width of the swing links 21 and 22 is regulated by the length of the long holes 11d and 12d through which the pins 22a and 22b slide. In the present embodiment, the opening / closing width of the swing links 21 and 22 is set to a length by which the head receiving portion 12 is moved by 50 mm in the front-rear direction.
Next, the control device 26 is configured to control the operation of the driving motor 25 based on detection signals from the seating sensor Ss and the head sensor Sh, as well shown in FIG. Although omitted in the drawing, the control device 26 performs the above-described operation control based on a detection signal from a sensor for predicting a rear collision of the vehicle. Here, the seating sensor Ss is embedded and installed on the seating surface side of the seat cushion 3, as shown well in FIG. 2, and detects the seating of the seated person P. Further, as well shown in FIG. 3, the head sensor Sh is embedded and installed on the head receiving surface side of the head receiving portion 12 so as to detect a relative position with respect to the head h in a non-contact state. It has become. The seating sensor Ss and the head sensor Sh are well known, and thus detailed description thereof is omitted.

Next, with reference to FIG. 6, the processing procedure of the operation control of the control device 26, that is, the position control of the headrest 4 will be described. In the following description, FIGS. 1 and 2 will be referred to as appropriate for each component such as the headrest 4 and the head receiving portion 12.
That is, the position control of the headrest 4 is mainly performed by detecting a vehicle rear-end collision at step T1, a distance between the head receiving portion 12 and the head h at step T3, and an elapsed time after the vehicle rear-end prediction at step T5. Based on. In the figure, the initial values of the flags F1 to F3 are 0.
First, in step T1, when a vehicle rear-end collision is predicted, 1 is set in the flag F1, and the head receiver 12 starts to move forward (step T2). When the distance L between the head receiving part 12 and the head h approaches within a predetermined value X due to the progress of the forward movement (step T3), 1 is set in the flag F2, and the movement of the head receiving part 12 is performed. Stopped (step T4). That is, through the steps so far, as shown by the phantom line in FIG. 2, the head receiving unit 12 is moved closer to the standby position where it contacts the head h of the seated person P. Here, the step concerning the approach movement corresponds to the first step of the present invention.
Next, when the impact force of the head h is applied to the head receiving part 12 due to the rearward collision of the vehicle, the impact force of the head h is temporarily received at the standby position until a predetermined time elapses (step T5). . This step T5 corresponds to the second step of the present invention. Here, the predetermined time is the time until the NIC converges when the head G exceeds the chest G, for example, as described above. The elapse of the predetermined time can be determined by the elapsed time from the vehicle rear-end collision prediction. That is, the behavior of the seated person P at the time of the rear collision of the vehicle can be estimated to some extent by the elapsed time after the collision. When the predetermined time elapses, the head receiving part 12 is moved backward to the receiving position (the phantom line position in FIG. 1) (step T6), and the impact force of the head h is received at this receiving position. Then, 1 is set in the flag F3. Here, the step until the impact force of the head h is received at the receiving position corresponds to the third step of the present invention. As described above with reference to FIG. 3, the rear movement of the head receiving portion 12 is performed by the operation control of the driving motor 25, and therefore compared with the biased acceleration in which the head h is biased backward. Tend to be late. Therefore, during the rearward movement of the head receiving portion 12, the headrest 4 can absorb the impact energy of the head h due to the difference in relative acceleration.
Then, after a lapse of a predetermined time (step T7) when a series of collision phenomena accompanying the vehicle rear-end collision converges, the head receiving portion 12 is returned to the initial position indicated by the solid line in FIG. 2 (step T8), and the processing is completed. To do.
In addition, since the usage method of a present Example is demonstrated by the process sequence of the said flowchart, it abbreviate | omits.

  As described above, according to the headrest device and the headrest control method of the present embodiment, when the rear collision of the vehicle occurs, the shearing force applied to the neck n that acts when the head h of the seated person P and the headrest 4 strike strongly. Can reduce the load. Then, the operation control for reducing the load of the shearing force on the neck n can be easily performed by the control using the existing configuration in which the drive motor 25 is driven in the reverse direction.

Although the embodiment of the present invention has been described with respect to one example, the present invention can be implemented in various forms in addition to the above-described example.
For example, the movement control of the headrest may be performed based on a detection signal from a sensor that detects a rear collision of the vehicle. In this case, the calculation of the predetermined time in step T5 shown in FIG. 6 can be calculated as, for example, the elapsed time after the vehicle rear-end collision is detected. Note that the calculation of the predetermined time can be calculated not as the elapsed time required for the rear collision of the vehicle but as the elapsed time since the collision between the head and the headrest. In addition to the calculation based on the passage of time, for example, an impact load or urging acceleration of the head applied to the headrest may be measured to detect that this has exceeded a predetermined value. Further, it may be based on the difference between the chest G and the head G.
Moreover, although the position which contacts a head was shown as a stand-by position of a head receiving part, the position close | similar to a head may be sufficient.

It is a side view showing a schematic structure of a headrest movement control device of a vehicular seat. It is a side view showing the sitting posture state of the seated person and the operating state of the headrest. It is a side view showing the structure of the internal structure of a headrest main body, and a drive device. It is a principal part expansion perspective view showing the structure of the drive device. It is a block diagram showing the system of a headrest movement control device. It is a flowchart showing the procedure of the process of a headrest movement control apparatus. It is a graph showing an example of the relationship between the head G and chest G applied to a seated person when a vehicle collision occurs and NIC.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat back 3 Seat cushion 4 Headrest 10 Headrest main body 11 Base 11a Mounting bracket 11b Pad 11c Skin 11d Long hole 11e Side wall member 12 Head receiving part 12a Mounting bracket 12b Pad 12c Skin 12d Long hole 12e Side wall member 13 Staying sheet 14 20 Driving device (driving means)
DESCRIPTION OF SYMBOLS 21 Oscillation link 21a, 21b Pin 22 Oscillation link 22a, 22b Pin 23 Connection pin 24 Connection shaft 25 Drive motor 25a Feed screw 26 Control device P Seated person h Head c Chest n Neck part Waist part Sh Head sensor Ss Seating sensor

Claims (4)

A vehicle seat headrest movement control method for receiving a head of a seat occupant by a headrest at the time of a vehicle rear collision,
A first step of moving a part or the whole of the headrest closer to a stand-by position close to or in contact with the seated person's head when a rear-end collision of the vehicle is predicted or detected;
A second step of temporarily receiving the impact force of the head that has collided with the rear-end collision of the vehicle at the standby position of the first step;
After a predetermined time during the impact force action after the second step, a part or the whole of the headrest is retracted in the direction of the impact force and the head is moved to the receiving position where the retracted movement is performed. A third step of receiving the impact force of the part,
A headrest movement control method for a vehicle seat, comprising: A headrest movement control device for a vehicle seat that moves part or all of the headrest in the direction of the head of the seat occupant when predicting or detecting a rear collision of the vehicle,
A headrest body for receiving the head of the seated person,
Driving means for moving the headrest body or a part thereof close to the seated person's head;
A control device for controlling the operation of the drive means;
Have
The control device controls the operation of the driving means when predicting or detecting a rear-end collision of the vehicle so that the headrest body or a part of the headrest body or the part of the headrest body before the head of the seated person collides with the headrest body. To the stand-by position that comes close to or in contact with the vehicle, and once receives the impact force of the head that has collided with the rear-end collision of the vehicle at the stand-by position, and after a lapse of a predetermined time during the action of the impact force A headrest for a vehicle seat, wherein the headrest body or a part of the headrest body is retreated in a direction in which the impact force is applied by a retracting means, and the impact force of the head is received at the retracted receiving position. Movement control device. It is a headrest movement control device of the vehicular seat according to claim 2,
The headrest movement control device for a vehicle seat, wherein the retracting means is a reverse drive of a driving motor provided in the driving means. It is a headrest movement control device of the vehicular seat according to claim 2,
The retracting means is a brake force reducing means for reducing the braking force of the driving motor by changing the energization state to the driving motor provided in the driving means after the predetermined time has elapsed,
The headrest movement control device for a vehicle seat, wherein the headrest body or a part thereof is pushed back by the action of an impact force received from the head and retreats to a receiving position.

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