JP2006335310A - Headrest device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest device for a vehicle capable of avoiding the holding of a headrest during the backward movement. <P>SOLUTION: The headrest device 10 for the vehicle comprises a headrest rear part 13 supported by a seatback 3, a headrest front part 14 which is free to advance/retract between the totally closed position 14A close to the headrest rear part 13 and the totally opened position 14B separate from the headrest rear part 13, a motor 15a to move the headrest front part 14, and an ECU 17 to control the motor 15a so that the headrest front part 14 is moved in the direction of the totally opened position 14B, the movement time is stored, the headrest front part 14 is moved backwardly for the first predetermined time based on the movement time when returning the headrest front part to the totally closed position 14A, and stopped at the position for the second predetermined time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle headrest device used in a vehicle such as an automobile.

2. Description of the Related Art Conventionally, there has been proposed a headrest device including a mechanism for moving a headrest forward of a vehicle so as to protect an occupant's head in the event of a collision from the rear of the vehicle.
For example, Patent Document 1 includes a lever / link mechanism that moves the headrest and a pressure receiving portion that moves under the load applied from the front surface of the seat back, and the lever / link mechanism increases the amount of movement of the pressure receiving portion. The one configured to move the headrest has been proposed. With this configuration, the amount of forward movement of the headrest increases in accordance with the amount of movement of the upper body of the occupant during a vehicle collision, so that the burden on the occupant's head can be reduced.

Further, Patent Document 2 discloses a left / right headrest member that is rotatable toward the front of the vehicle, a lock mechanism that restricts rotation of the left / right headrest member, and a left / right headrest member that is rotated forward of the vehicle. In this state, a film-like body stretched between both members and a control means for releasing the lock of the lock mechanism based on detection of a collision from the rear of the vehicle have been proposed. With this configuration, at the time of a vehicle collision, the left and right headrest members can be rotated forward to stretch the film-like body and the occupant's head can be restrained reliably and quickly.
JP 2000-2111410 A JP 2003-54343 A

  By the way, in recent years, for example, a headrest device has been considered that determines the possibility of a vehicle collision based on a detection result obtained by detecting the distance between the vehicles behind and activates the headrest when the possibility of a collision is high. The headrest is moved in preparation for a collision. In the case of such a headrest device, it is necessary to move the headrest to the original position for re-operation when a collision is avoided. However, in the configuration of Patent Document 1, a load of a predetermined value or more must be applied to the headrest in order to release the engagement between the plunger and the locking hole. There is a problem that it takes. Further, with the configuration of Patent Document 2, it is necessary to rotate the headrest member toward the rear of the vehicle against the elastic force of a spring that stretches the film-like body by rotating the headrest member toward the front of the vehicle. As described above, there is a problem that it takes a lot of time and effort which requires a very large force for rotation.

  Therefore, a configuration is conceivable in which the headrest is moved forward of the vehicle by an electric driving means such as a motor, and then the headrest is returned to the original position. However, when the headrest is set so that it immediately goes forward in the vehicle, if the headrest is returned to the original position at the same speed, there is a possibility that foreign matter or the like may be caught.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle headrest device that can avoid pinching when the headrest moves backward.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a fixed portion supported with respect to a seat back, a fully closed position adjacent to the fixed portion, and a fully opened position spaced apart from the fixed portion. A movable part that is movable back and forth between positions, a driving means that moves the movable part, a movable part that moves in the direction of the fully open position, and a time that the movement is stored, and that the movable part is moved to the fully closed position. And a control means for controlling the drive means to move backward for a first predetermined time based on the moving time and stop at the position for a second predetermined time when returning. It is a headrest device.

  According to the first aspect of the present invention, when the movable portion is moved in the fully opened position direction and then returned to the fully closed position, the movable portion moves backward for a first predetermined time based on the moving time in the fully opened position direction. The position is stopped for a second predetermined time. The first predetermined time is a time when the movable portion moves in the direction of the fully closed position for that time, so that the occupant can remove a foreign object or the like between the fixed portion and the movable portion. The second predetermined time is a time during which the occupant can remove foreign matter or the like existing between the fixed portion and the movable portion. For this reason, even when there is a foreign object or the like between the fixed part and the movable part, the occupant who noticed the movement of the movable part to the fully closed position is in a state where the movable part is stopped. Foreign matter or the like can be removed from between the fixed portion and the movable portion. Therefore, the pinching between the fixed portion and the movable portion can be prevented, and the pinching when the headrest moves backward can be avoided.

  According to a second aspect of the present invention, in the vehicle headrest device according to the first aspect, the control means sets the first predetermined time as a time obtained by subtracting a third predetermined time from the movement time. .

  According to the second aspect of the present invention, the movable portion moves backward for a first predetermined time obtained by subtracting the third predetermined time from the moving time from the fully closed position toward the fully open position, and is stopped. The third predetermined time is a time at which the occupant can remove a foreign object or the like between the fixed portion and the movable portion by moving the movable portion forward by that amount of time. For this reason, regardless of the length of the movement time of the movable part in the fully open position direction, the movable part stops at a position where the occupant can remove foreign substances and the like. Therefore, the pinching between the fixed portion and the movable portion can be prevented, and the pinching when the headrest moves backward can be avoided.

  According to a third aspect of the present invention, in the vehicle headrest device according to the second aspect, the control means calculates the first predetermined time based on the third predetermined time set to a predetermined value. And

  According to the third aspect of the present invention, the control unit calculates the first predetermined time until the movable unit stops by subtracting the predetermined value from the moving time, and therefore, compared with the case where the third predetermined time varies. Thus, the first predetermined time can be simply calculated, and the processing speed can be increased.

According to a fourth aspect of the present invention, in the vehicle headrest device according to the second aspect, the control means calculates the third predetermined time based on the moving time.
According to the fourth aspect of the invention, since the control unit calculates the third predetermined time based on the movement time, the position where the movable unit stops when returning to the fully closed position corresponds to the operating state of the movable unit. Position.

  According to a fifth aspect of the present invention, in the vehicle headrest device according to the second aspect, the control means sets the third predetermined time with reference to a numerical table associated with the output signal of the driving means. It is characterized by doing.

  According to the fifth aspect of the present invention, since the control unit sets the third predetermined time based on the output signal of the driving unit, the position where the movable unit stops when returning to the fully closed position is set to the operation of the driving unit. The position can correspond to the state.

  According to a sixth aspect of the present invention, in the vehicle headrest device according to any one of the first to fifth aspects, the movable part detects a contact of a head of a seated occupant or a distance to the head. The head detecting means for stopping the movable portion based on a detection signal from the head detecting means when moving the movable portion in the direction of the fully open position. The moving time from the start to the stop of the operation is stored.

  According to the sixth aspect of the present invention, the control unit can move the movable unit to a position where the head of the occupant contacts at the time of a collision from the rear of the vehicle. For this reason, a movable part can stop at the appropriate position which does not put a burden on a crew member's neck, etc., and can protect a crew member's head at the time of a collision suitably.

  ADVANTAGE OF THE INVENTION According to this invention, the headrest apparatus for vehicles which can avoid pinching at the time of the movement to the back of a headrest can be provided.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which the present invention is embodied in a vehicle headrest device for a vehicle seat will be described with reference to the drawings.
As shown in FIG. 1, the vehicle seat 1 includes a seat seat 2 and a seat back 3, and a vehicle headrest device 10 is provided at an upper end portion of the seat back 3. The vehicle headrest device 10 includes a headrest 11, and the headrest 11 moves with respect to a headrest rear portion 13 as a fixed portion supported by a headrest stay 12 provided at an upper end portion of the seat back 3, and the headrest rear portion 13. The headrest front part 14 as a movable part made possible is provided. The headrest front part 14 includes a fully closed position 14A close to the headrest rear part 13 as shown by a solid line in FIG. 1, and a fully open position 14B spaced from the headrest rear part 13 as shown by a two-dot chain line in FIG. It is said that it can freely move between. During normal operation of the vehicle, the headrest front portion 14 is disposed at the fully closed position 14A. Note that the front-rear direction of the vehicle headrest device 10 is the same as the front-rear direction of the vehicle, and the same applies to the following description.

  In addition, the vehicle headrest device 10 includes a drive mechanism 15 that moves the headrest front part 14 back and forth, a motor 15a as a drive unit that drives the drive mechanism 15, a head detection sensor 16 as a head detection unit, and a motor. ECU17 as a control means which controls 15a is provided.

  The drive mechanism 15 is configured to move the headrest front part 14 in the advancing and retreating direction by extending and contracting between the headrest rear part 13 and the headrest front part 14. The head detection sensor 16 detects that the head of an occupant seated on the vehicle seat 1 has contacted the headrest front part 14. The head detection sensor 16 is configured by a touch sensor and is installed on the front surface of the headrest front portion 14. The head detection sensor 16 may detect a distance to the passenger's head (for example, a distance within about 5 mm). The ECU 17 stops the movement of the headrest front portion 14 when the head of the occupant is detected based on the detection signal from the head detection sensor 16 when moving the headrest front portion 14 in the direction of the fully open position 14B. . This stop position is defined as a head position 14H. Further, the ECU 17 moves the headrest front portion 14 to the fully open position 14B when the occupant's head is not detected.

  Further, the ECU 17 controls the motor 15a so as to return the headrest front portion 14 from the fully closed position 14A to the fully opened position 14B and then to the original fully closed position 14A in the event of a collision from the rear of the vehicle. The ECU 17 has a timer function, and measures the moving time and stop time of the headrest front part 14 by the timer function. Then, the ECU 17 stores the movement time A from the fully closed position 14A toward the fully opened position 14B in the storage unit of the ECU 17, and when the headrest front part 14 is returned to the fully closed position 14A, the movement of the headrest front part 14 is stored. The motor 15a is controlled so as to stop after being moved backward for a first predetermined time T1 based on the time A and to hold the position for the second predetermined time T2.

  Specifically, as shown in FIG. 2A, the ECU 17 moves the headrest front portion 14 from the fully closed position 14A toward the fully opened position 14B. The ECU 17 stops the headrest front portion 14 at the head position 14H where the head of the passenger is detected by the head detection sensor 16. The headrest front part 14 is moved so as to protect the passenger's head instantaneously at the time of a collision from the rear of the vehicle, and the moving time from the fully closed position 14A to the fully opened position 14B is, for example, 1 second. The distance between them is, for example, about 50 mm to 100 mm.

  Then, the ECU 17 measures the movement time A from the start of the movement of the headrest front part 14 to the stop, and based on the movement time A, the first predetermined time T1, that is, the headrest front part 14 is stopped. Calculate the time to move backward until The first predetermined time T1 is calculated based on the third predetermined time T3. As shown in FIG. 3, the ECU 17 first sets a third predetermined time T3, and calculates the first predetermined time as (movement time A−third predetermined time T3).

  As shown in FIG. 2B, the third predetermined time is set according to a distance L2 that separates the headrest front portion 14 and the headrest rear portion 13 from each other so as not to insert foreign objects or the like. The position of the headrest front part 14 at this time is defined as a stop position 14S. In addition, the distance L2 which can remove the foreign material etc. between the headrest rear part 13 and the headrest front part 14 is about 10 and several mm, for example. For this reason, the first predetermined time T1 is a time required to move the headrest front portion 14 from the stop position to the stop position 14S.

  In the present embodiment, the ECU 17 sets the third predetermined time T3 with reference to, for example, a map M as a numerical table shown in FIG. In the map M, a third predetermined time T3 is set based on the relationship between the output voltage (output signal) V of the motor 15a and the movement time A. That is, in the map M, the third predetermined time T3 is a movement time in which the output voltage V of the motor 15a for determining the moving speed of the headrest front portion 14 and the movement distance L1 (see FIG. 2A) of the headrest front portion 14 are determined. Associated with A. For example, when the output voltage V is V2 and the movement time A is A1, the third predetermined time T3 is set to T32.

  Then, as shown in FIG. 2 (a), the ECU 17 performs a retracting operation in the direction of the arrow in the drawing, that is, the motor 15a so as to contract the drive mechanism 15 between the headrest rear portion 13 and the headrest front portion 14. When the headrest front part 14 is moved backward for the first predetermined time T1, as shown in FIG. 2 (b), it is stopped at the stop position 14S. Thereafter, the ECU 17 stops the headrest front portion 14 at the stop position 14S for the second predetermined time T2. The second predetermined time T2 is a time during which the occupant can remove foreign matter or the like existing between the headrest rear portion 13 and the headrest front portion 14.

  Thereafter, as shown in FIG. 2C, the ECU 17 resumes the storing operation of the headrest front portion 14 in the direction of the arrow in the drawing, and moves the headrest front portion 14 backward for a third predetermined time T3. Then, the headrest front part 14 is returned to the fully closed position 14A.

  As shown in FIGS. 2 (a) to 2 (c), the ECU 17 described above when the movement distance L1 of the headrest front portion 14 from the fully closed position 14A to the fully opened position 14B is relatively short. Such stop control at the time of storing the headrest front part 14 is not performed. In the present embodiment, when the movement time A is equal to or shorter than the third predetermined time T3, that is, when the head position 14H of the headrest front part 14 is behind the stop position 14S, the headrest front part 14 Stop control is not performed.

Next, the electrical configuration of the vehicle headrest device 10 will be described.
As shown in FIG. 5, the vehicle headrest device 10 includes an ECU 17, a motor 15 a connected to the ECU 17, a head detection sensor 16, a power supply device 18, a collision determination unit 19, and the like. The ECU 17 includes a CPU 21, a power supply circuit 22 connected to the CPU 21, a vehicle information input circuit 23, a motor drive circuit 24, a head detection sensor circuit 25, and the like.

  The CPU 21 is connected to the power supply device 18 via an ignition switch (IGSW), and is configured to be supplied with power from the power supply device 18 via the power supply circuit 22 by turning on the ignition switch.

  The CPU 21 inputs vehicle information such as rear approach information from the collision determination unit 19 via the vehicle information input circuit 23. The collision determination unit 19 is connected to a radar (not shown) installed in a bumper at the rear of the vehicle, and inputs a signal from the radar to comprehensively calculate the relative speed / distance with the following vehicle and the vehicle speed. Determine whether there is a possibility of collision with the following vehicle. Then, the determination result is output to the vehicle information input circuit 23.

The CPU 21 is connected to the motor 15a via the motor drive circuit 24, and controls the motor drive circuit 24 to drive the motor 15a.
The CPU 21 is connected to the head detection sensor 16 via the head detection sensor circuit 25, and receives a detection signal from the head detection sensor 16 to determine whether the head has been detected.

Next, processing executed by the ECU 17 of the vehicle headrest device 10 will be described.
As shown in FIG. 6, first, the ECU 17 determines in step 100 whether there is rear approach information. When there is no rear approach information (step 100, NO), step 100 is repeated. When there is rear approach information (step 100, YES), the ECU 17 starts the forward movement of the headrest front portion 14 in step 110.

  Next, in step 120, the ECU 17 determines whether there is head detection. If the head is not detected (step 120, NO), the ECU 17 proceeds to step 130, and determines whether or not a certain time has elapsed since the headrest front portion 14 started moving forward. This fixed time is, for example, a time during which the headrest front portion 14 becomes a full stroke, and is set to about several seconds. If the predetermined time has not elapsed (step 130, NO), the ECU 17 returns to step 120. If the predetermined time has elapsed (step 130, YES), the ECU 17 proceeds to step 140 and stops the movement of the headrest front portion 14. In this case, the headrest front portion 14 stops at the fully open position 14B (see FIG. 1). Further, when the head is detected in step 120 (step 120, YES), the ECU 17 stops the movement of the headrest front portion 14 in step 140. At this time, the front portion of the headrest stops at the head position 14H (see FIG. 1). Then, the ECU 17 proceeds to step 150 and stores the forward movement time A of the headrest front portion 14.

  Next, the ECU 17 proceeds to step 160 and determines whether or not a predetermined time has elapsed since the front movement of the headrest front portion 14 was stopped. The predetermined time is set to a time that can sufficiently protect the head of the occupant after the headrest front portion 14 stops, and is set to 2 seconds, for example.

  If the predetermined time has not elapsed (step 160, NO), the ECU 17 repeats step 160. If the predetermined time has elapsed (step 160, YES), the ECU 17 proceeds to step 170 and starts the rearward movement of the headrest front part 14 (storage operation of the headrest front part 14).

  In step 180, the ECU 17 determines whether or not the movement time A is equal to or shorter than the third predetermined time T3. If the movement time A is longer than the third predetermined time T3 (step 180, NO), the process proceeds to step 190, where the rear movement of the headrest front part 14 is started and the first predetermined time T1 (that is, movement time A-third). It is determined whether or not a predetermined time T3) has elapsed. If the first predetermined time T1 has not elapsed (step 10, NO), the ECU 17 repeats step 190. If the first predetermined time T1 has elapsed (step 190, YES), the ECU 17 proceeds to step 200 and stops the backward movement of the headrest front portion 14. At this time, the headrest front portion 14 stops at a stop position 14S (see FIG. 2B).

  In step 210, the ECU 17 determines whether or not the second predetermined time T2 has elapsed since the backward movement of the headrest front portion 14 was stopped. The second predetermined time T2 is set to a time sufficient for the occupant to remove the foreign matter or the like when there is foreign matter or the like between the headrest front portion 14 and the headrest rear portion 13, and is set to 2 seconds, for example. Has been.

  If the second predetermined time T2 has not elapsed (step 210, NO), the ECU 17 repeats step 210. If the second predetermined time T2 has elapsed (step 210, YES), the ECU 17 proceeds to step 220 and resumes the backward movement of the headrest front portion 14.

  In step 180, when the moving time A is equal to or shorter than the third predetermined time T3 (step 180, YES), the ECU 17 proceeds to step 220 and starts moving the headrest front portion 14 backward. In this case, the head position 14H of the headrest front part 14 is behind the stop position 14S. Therefore, the distance between the headrest front portion 14 and the headrest rear portion 13 is small, and foreign matter or the like does not enter between the headrest front portion 14 and the headrest rear portion 13. For this reason, it is not necessary to stop the headrest front part 14.

  Thereafter, in step 230, the ECU 17 determines whether or not a predetermined time has elapsed since the rearward movement of the headrest front portion 14 was started. This predetermined time is a time required for the headrest front portion 14 to move from the stop position 14S to the fully closed position 14A, that is, a third predetermined time T3.

  If the predetermined time has not elapsed (step 230, NO), the ECU 17 repeats step 230. If the predetermined time has elapsed (step 230, YES), the ECU 17 proceeds to step 240 and stops the backward movement of the headrest front portion 14. The ECU 17 repeats the processing from step 100 to step 240 described above while the ignition switch of the vehicle is in the ON state.

Therefore, according to this embodiment, the following effects can be obtained.
(1) When the headrest front part 14 is moved in the fully open position 14B direction and then returned to the fully closed position 14A, the headrest front part 14 moves backward for a first predetermined time T1 based on the movement time A in the fully open position 14B direction, The second predetermined time T2 is stopped at the stop position 14S. Therefore, even when there is a foreign object or the like between the headrest rear part 13 and the headrest rear part 14, the occupant who noticed the movement of the headrest front part 14 to the fully closed position 14 </ b> A is Foreign matter or the like can be removed from between the headrest rear portion 13 and the headrest front portion 14 while 14 is stopped. Therefore, the pinching between the headrest rear part 13 and the headrest front part 14 can be prevented, and the pinching during the backward movement of the headrest 11 can be avoided.

  (2) The headrest front part 14 moves backward for a first predetermined time T1 obtained by subtracting the third predetermined time T3 from the moving time A from the fully closed position 14A to the fully opened position 14B, and is stopped. For this reason, the headrest front part 14 stops at the stop position 14S where the occupant can remove the foreign matter regardless of the length of time for the headrest front part 14 to move to the fully closed position 14A. Therefore, the pinching between the headrest rear part 13 and the headrest front part 14 can be prevented, and the pinching during the backward movement of the headrest 11 can be avoided.

  (3) Since the third predetermined time T3 is set based on the output voltage (output signal) of the motor 15a, the stop position 14S, which stops when the headrest front part 14 returns to the fully closed position 14A, is set to actuate the motor 15a. The position can correspond to the state.

  (4) Since the ECU 17 performs time control of the motor 15a to perform stop control when the headrest front portion 14 is stored, a member such as a sensor for detecting pinching is not necessary. For this reason, it is possible to prevent the headrest 11 from being caught without increasing the number of parts.

  (5) At the time of a collision from the rear of the vehicle, the ECU 17 can move the headrest front portion 14 to a position where the head of the occupant contacts (head position 14H). For this reason, the headrest front part 14 can stop at an appropriate position (head position 14H) that does not place a burden on the occupant's neck and the like, and can suitably protect the occupant's head during a collision.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the first predetermined time T1 is calculated by subtracting the third predetermined time T3. However, the ECU 17 determines the first predetermined time based only on the movement time A regardless of the third predetermined time T3. T1 may be set. Then, the calculation for setting the first predetermined time T1 can be simplified.

  In the above embodiment, the third predetermined time T3 is set with reference to the map M, but the ECU 17 may calculate the first predetermined time T1 based on the third predetermined time set to a predetermined value. Good. Then, since the ECU 17 calculates the first predetermined time T1 until the headrest front portion 14 stops by subtracting a predetermined value from the movement time A, the first time is simply compared with the case where the third predetermined time T3 varies. The predetermined time T1 can be calculated. Therefore, the processing speed can be increased.

  Further, the ECU 17 may calculate the third predetermined time T3 based on the movement time A. In this case, for example, the third predetermined time T3 is calculated as A / 2. Then, since the third predetermined time is calculated based on the movement time A, the stop position 14S that stops when returning to the fully closed position 14A of the headrest front portion 14 is set to a position corresponding to the operating state of the headrest front portion 14. can do.

  Further, the ECU 17 may combine a case where the third predetermined time T3 is set with reference to the map M, a case where the third predetermined time T3 is set in advance, and a case where the third predetermined time T3 is calculated based on the movement time A. In that case, ECU17 should just change the setting method of 3rd predetermined time T3 by the grade of the movement time A, for example.

  In the above embodiment, the ECU 17 sets the third predetermined time T3 with reference to the map M associated with the output voltage V of the motor 15a and the movement time A, but an appropriate value is set. In this case, the numerical table for setting the third predetermined time T3 is not limited to this. Further, the output signal of the motor 15a related in the map M is not limited to the output voltage V, and may be an output current, for example.

  In the above embodiment, the ECU 17 is configured to measure the movement time A of the headrest front portion 14 in the direction from the fully closed position 14A to the fully opened position 14B using a timer. Good. For example, the ECU 17 may include a counter that counts a pulse signal input from the motor 15a, and may store the counter value as the moving time of the headrest front portion 14.

  In the above-described embodiment, the case where the head detection sensor 16 is configured by a touch sensor has been described. However, the head detection sensor 16 may be configured in any manner as long as contact with the head of the occupant can be detected. Good. For example, the head detection sensor 16 may be configured by a capacitive sensor.

  In the above embodiment, the collision determination unit 19 detects the collision from the rear to the vehicle based on the signal from the radar installed on the bumper of the vehicle, but can detect the collision from the rear to the vehicle. In this case, the determination may be made by other means such as a speed sensor.

  In the above embodiment, the vehicle headrest device 10 includes the head detection sensor 16 as the head detection means, but the head detection sensor 16 does not necessarily have to be provided. In that case, for example, the movement distance and movement time of the headrest front portion 14 in the direction of the fully open position 14B may be set in advance.

In the above embodiment, the motor is used as the driving unit. However, the driving unit may be any unit that drives the headrest front portion 14, and may be a hydraulic cylinder, for example.
The technical ideas that can be grasped from the above embodiments are described below.

  (A) In the vehicle headrest device according to any one of claims 2 to 6, wherein the control means moves the movable portion to the fully closed position when the moving time is equal to or shorter than the third predetermined time. A headrest device for a vehicle, which is not stopped when returning to a position.

The schematic diagram of a vehicle seat. (A)-(c) is explanatory drawing explaining the effect | action of the headrest apparatus for vehicles. Explanatory drawing for demonstrating the movement time of a headrest. Explanatory drawing of the map M. FIG. The block diagram which shows the electric constitution of the headrest apparatus for vehicles. The flowchart explaining the process which the headrest apparatus for vehicles performs.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Seat back, 10 ... Vehicle headrest apparatus, 11 ... Headrest, 13 ... Headrest rear part (fixed part), 14 ... Headrest front part (movable part), 14A ... Fully closed position, 14B ... Fully open position, 15a ... Motor ( Drive means), 16 ... head detection sensor (head detection means), 17 ... ECU (control means), M ... map (numerical table), V ... output voltage (output signal), A ... travel time, T1 ... first 1 predetermined time, T2 ... 2nd predetermined time, T3 ... 3rd predetermined time.

Claims (6)

A fixed portion supported against the seat back;
A movable part that is movable back and forth between a fully closed position close to the fixed part and a fully open position spaced from the fixed part;
Drive means for moving the movable part;
The movable part is moved in the direction of the fully open position and the movement time is stored, and when the movable part is returned to the fully closed position, the movable part is moved backward by a first predetermined time based on the movement time, Control means for controlling the drive means to stop for a second predetermined time;
A vehicle headrest device. The vehicle headrest device according to claim 1,
The vehicle headrest device, wherein the control means sets the first predetermined time as a time obtained by subtracting a third predetermined time from the moving time. The vehicle headrest device according to claim 2,
The vehicle headrest device, wherein the control means calculates the first predetermined time based on the third predetermined time set to a predetermined value. The vehicle headrest device according to claim 2 or 3,
The vehicle headrest device, wherein the control means calculates the third predetermined time based on the travel time. In the vehicle headrest device according to any one of claims 2 to 4,
The vehicle headrest device, wherein the control means sets the third predetermined time with reference to a numerical table associated with an output signal of the driving means. In the vehicle headrest device according to any one of claims 1 to 5,
The movable part includes a head detection means for detecting contact with the head of a seated occupant or a distance to the head,
The control means stops the movable part based on a detection signal from the head detecting means when moving the movable part in the fully open position direction, and a moving time from the start of operation of the movable part to the stop. Storing the vehicle headrest device.

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