JP2011178206A - Headrest device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain such a position that a position of a headrest (a headrest body) is comfortable for an occupant and the restraint of the head of the occupant becomes higher even when the occupant is seated in a seat and an angle of a seat back changes. <P>SOLUTION: Based on an angle detected by a seat back angle sensor 16 as angle detection means of detecting an angle of the seat back 14, the movement of a headrest front portion 12b is controlled so that a back set is a predetermined value. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a headrest device, and more particularly to a headrest device that is comfortable for the occupant and has high restraint on the occupant's head even when the occupant sits on a seat and the angle of the seat back changes.

  Conventionally, a rear impact (collision between the host vehicle and the following vehicle) is predicted using a radar, and if there is a possibility of a rear impact, the headrest front is moved toward the fully closed position relative to the headrest rear. The technique to make is known (for example, refer patent document 1).

JP 2007-168751 A

  However, in the technique described in Patent Document 1, when the vehicle speed of the following vehicle that impacts rearward is high or the like, the vehicle is rearwardly impacted by the succeeding vehicle before moving the front part of the headrest after predicting the rearward impact. A case where the head moves greatly to the rear of the vehicle can be considered. In such a case, the restraint of the occupant's head is reduced, and it is desired to further enhance the restraint of the occupant's head.

  Here, the smaller the back set of the occupant's head and the headrest (the horizontal distance between the occupant's head and the headrest) is, the higher the restraint of the occupant's head is. Although it is conceivable to fix the position of the headrest, in this case, the distance between the head of the occupant and the headrest is small, which is troublesome for the occupant. Also, the larger the backset, the more comfortable it will be for the occupant, so it may be possible to fix the position of the headrest in advance so that the backset also becomes larger, but in this case, the head of the occupant Since the distance between the headrest and the headrest is large, the restraint of the occupant's head is reduced. Therefore, the optimal backset value that is comfortable for the occupant and increases the occupant's head restraint in advance is statistically or experimentally determined so that the backset is obtained. It is conceivable to fix the position of the headrest.

  However, even if the position of the headrest is fixed in advance so that the value of the backset is optimal in this way, the size of the backset changes according to the angle of the seatback due to the physique and preference of the occupant, There is a problem that the actual size of the backset is not the optimum backset value obtained as described above.

  The present invention was made to solve the above-described problems, and even when the occupant is seated on the seat and the angle of the seat back changes, the position of the headrest (headrest body) is comfortable for the occupant, And it aims at providing the headrest apparatus used as the position where the restraint nature of a crew member's head becomes high.

  In order to achieve the above object, a first headrest device according to the present invention includes a headrest rear portion supported against a seat back provided with a variable angle with respect to a seat on which an occupant is seated, and the headrest rear portion. A headrest body having a headrest front portion movable within a predetermined range from a closest fully closed position to a fully opened position farthest from the rear portion of the headrest, and an angle detection means for detecting an angle of the seat back; Based on the angle detected by the angle detection means, a movement control means for controlling the movement of the front portion of the headrest so that a backset, which is a horizontal distance between the head of the occupant and the headrest, has a predetermined value. It is equipped with.

  According to the first headrest device of the present invention, the movement of the front portion of the headrest is controlled so that the backset becomes a predetermined value based on the angle detected by the angle detection means for detecting the angle of the seat back. By appropriately determining the above predetermined value, even if the occupant sits on the seat and the angle of the seat back changes, the position of the headrest body is comfortable for the occupant and the restraint of the occupant's head becomes high It becomes a position like this.

  In the first headrest device of the present invention, the movement control means is configured so that the backset, which is a horizontal distance between the occupant's head and the headrest, has a predetermined value so that a backset has a predetermined value. Based on the movement amount of the headrest front part corresponding to the angle detected by the angle detection means stored in the storage means storing the movement amount of the corresponding headrest front part, the headrest front part is moved to the fully closed position. It is also possible to perform control so as to move in the direction of the fully open position by the amount of movement.

  In order to achieve the above object, the second headrest device of the present invention is supported by a seat back in which an occupant is seated and the angle of the occupant is variable with respect to a seat provided in the vehicle. A headrest body having a headrest rear portion, and a headrest front portion movable within a predetermined range from a fully closed position closest to the headrest rear portion to a fully opened position furthest away from the headrest rear portion; and Angle detecting means for detecting an angle with respect to a predetermined direction, floor surface angle detecting means for detecting an angle with respect to the predetermined direction of a floor surface on which the seat of the vehicle is mounted, and an angle detected by the angle detecting means Calculation means for calculating a correction angle corrected by the angle detected by the floor surface angle detection means, and correction calculated by the calculation means Based on time, it backset a horizontal distance between the occupant of the head the head rest and a movement control means for controlling the movement of the headrest front portion to a predetermined value.

  According to the second headrest device of the present invention, the backset is based on the correction angle obtained by correcting the angle detected by the angle detection unit that detects the angle of the seat back with the angle detected by the floor surface angle detection unit. Since the movement of the front part of the headrest is controlled so that it becomes a predetermined value, even if the occupant is seated on the seat and the angle of the seat back changes, the position of the headrest body can be This is a position that is comfortable for the passenger and the restraint of the head of the occupant is high. Further, the correction angle obtained by correcting the angle detected by the angle detection means by the calculation means with the angle detected by the floor surface angle detection means is calculated. For example, the floor angle detection is performed from the angle detected by the angle detection means. When the value obtained by subtracting the angle detected by the means is calculated as the correction angle, for example, even when the vehicle is located on a road surface inclined with respect to a horizontal direction other than a horizontal plane such as a slope. The angle that takes into account the inclination of the vehicle is calculated as the correction angle, and the movement of the front part of the headrest is controlled based on the correction angle so that the backset becomes a predetermined value. The size of the backset will be more appropriate.

  In the second headrest device according to the present invention, the movement control means may adjust the backset, which is a horizontal distance between the occupant's head and the headrest, to a predetermined angle such that a backset has a predetermined value. Based on the movement amount of the headrest front part corresponding to the correction angle calculated by the calculation means stored in the storage means storing the movement amount of the corresponding headrest front part, the headrest front part is moved to the fully closed position. It is also possible to perform control so as to move in the direction of the fully open position by the amount of movement.

  In the first headrest device or the second headrest device, the floor surface angle detection means may include a gyro sensor provided in a car navigation device mounted on the vehicle. In general, a car navigation device is mounted on a vehicle, and the car navigation device is equipped with a gyro sensor. Therefore, by detecting the angle of the floor surface of the vehicle using the existing gyro sensor, It becomes possible to hold down the cost.

  The predetermined value may be 35 mm.

  As described above, according to the first headrest device and the second headrest device according to the present invention, even if the occupant sits on the seat and the angle of the seat back changes, the position of the headrest body is It is possible to obtain an effect that it is comfortable and the restraint of the head of the occupant can be enhanced.

It is a figure which shows the headrest apparatus which concerns on 1st Embodiment. It is a figure which shows the drive mechanism which concerns on 1st Embodiment. It is a figure which shows the headrest apparatus which concerns on 1st Embodiment. It is a figure which shows an example of the back set which changes with the angle of a seat back. It is a figure for demonstrating the operation amount according to the angle of a seat back. It is a figure for demonstrating the conditions in the case of performing movement control of a seat back. It is a flowchart of the 1st headrest movement control process which CPU of headrest control ECU performs. It is a figure which shows the headrest apparatus which concerns on 2nd Embodiment. It is a flowchart of the 2nd headrest movement control process which CPU of headrest control ECU performs.

  Hereinafter, with reference to the drawings, each embodiment when the present invention is applied to a headrest device for a vehicle will be described in detail.

[First Embodiment]
First, the first embodiment will be described. As shown in FIG. 1, the headrest device 10 according to the first embodiment includes a headrest body 12, a seatback angle sensor 16 for detecting the angle of the seatback 14, and a movement amount (operation amount) of the headrest front portion 12 b. ) Is detected, and a headrest control ECU (Electronic Control Unit) 20 is provided.

  The headrest body 12 includes a headrest rear portion 12a supported with respect to a seat back 14 provided with a variable angle with respect to a seat 40 (see FIG. 4) on which the occupant A is seated, and the headrest rear portion 12a closest to the headrest rear portion 12a. A headrest front portion 12b is provided that is movable within a predetermined range from the closed position 11A to the fully open position 11B that is farthest from the headrest rear portion 12a. In the example of FIG. 1, the position of the headrest front portion 12b indicated by the wavy line is the fully closed position 11A, and the position of the headrest front portion 12b indicated by the solid line is the fully open position 11B.

  Here, the headrest body 12 will be described in more detail. As described above, the headrest main body 12 includes the headrest front portion 12b on the front side of the vehicle and the headrest rear portion 12a on the rear side, and the drive mechanism 2 for driving the headrest front portion 12b in the front-rear direction inside. I have. When the drive mechanism 2 is driven, the headrest front portion 12b is reciprocated in the vehicle front-rear direction with respect to the headrest rear portion 12a, and the distance between the head of the occupant and the headrest front portion 12b is controlled. More specifically, the backset (size of the backset), which is the horizontal distance between the head of the occupant and the headrest front portion 12b, is controlled.

  FIG. 2 shows an example of a structure diagram of the drive mechanism 2. A pair of front and rear bases 21 and 22 are connected by a pair of left and right X-shaped links 24. One base 21 is coupled to the front side headrest front part 12b, and the other base 22 is coupled to the rear side headrest rear part 12a. The pair of links 24 includes two link members 24 a and 24 b, respectively, and substantially central portions of the link members 24 a and 24 b are rotatably connected by pins 29. Both end portions of the link members 24a and 24b are connected to side portions 21a and 22a provided integrally on both sides of the bases 21 and 22, respectively.

The pair of link members 24a have their front ends connected to each other by a shaft 26c. Both end portions of the shaft 26c are slidably connected to a longitudinal guide hole 21b formed in the side portion 21a of the base 21, and the rear end portion of the link member 24a is rotatable to the side portion 22a of the base 22 by a pin 25b. It is connected to.
On the other hand, the pair of links 24b are coupled to each other by a shaft 26a at the front end and a shaft 26b at the rear end. The front end portion of the link 24b is rotatably connected to the side portion 21a of the base 21 by a pin 25a, and both end portions of the shaft 26b are slidable in a vertically long guide hole 22b formed in the side portion 22a of the base 22. It is connected.

  The back side base 22 includes an electric unit 28 that is a drive source of the drive mechanism 2. The motor 28 a of the electric unit 28 is attached to the inside of the base 22. The drive shaft of the motor 28a is connected to the shaft 26c via the ball screw portion 28b. By the function of the ball screw portion 28b, the forward / reverse rotation of the motor 28a is converted into the lifting / lowering operation of the shaft 26c. Therefore, based on the drive control of the electric unit 28, both X-shaped links 24 operate like a pantograph, and the base 21 moves relative to the base 22.

  The drive mechanism 2 shown in FIG. 2 is an example of a mechanism for moving the headrest front portion 12b, and any mechanism can be used as long as the headrest front portion 12b is moved relative to the headrest rear portion 12a. Also good.

  The seat back angle sensor 16 is for detecting the angle of the seat back 14 with respect to the vertical direction, and outputs a detection signal indicating the detected angle to the headrest control ECU 20. For example, an acceleration sensor or the like can be used as the seat back angle sensor 16.

  The headrest operation amount detection sensor 18 is for detecting the amount of movement (operation amount) of the headrest front portion 12b from the fully closed position 11A, and outputs a detection signal indicating the detected amount of movement to the headrest control ECU 20. As the headrest operation amount detection sensor 18, for example, a potentiometer, a linear sensor, a rotary encoder, or the like can be used. In addition, you may use the sensor which detects the position from 11 A of fully closed positions of the headrest front part 12b, without using the sensor which detects the moving amount | distance.

  As shown in FIG. 3, the headrest control ECU 20 is connected to the seatback angle sensor 16, the headrest operation amount detection sensor 18, the ignition switch 5, and the drive mechanism 2 (more specifically, the motor 28 a of the drive mechanism 2). . The headrest control ECU 20 includes a ROM (Read Only Memory), a CPU (Central Processing Unit), a RAM (Random Access Memory), and an I / O (input / output) port. The ROM, CPU, RAM, and I / O port are connected to each other via a bus.

  A ROM serving as a storage medium (storage means) stores a basic program such as an OS and a program for executing a processing routine of a first headrest movement control process that will be described in detail below.

  Here, FIG. 4A and FIG. 4B show the relationship between the angle of the seat back 14 (the so-called reclining angle, in this embodiment, the angle of the seat back 14 with respect to the vertical direction) and the size of the back set. An example is shown. As shown in FIG. 4, it can be seen that when the angle of the seat back 14 changes, the size of the back set also changes. Therefore, in the present embodiment, even if the angle of the seat back 14 changes, the size of the back set remains in an appropriate size (predetermined value, target value) according to the angle of the seat back 14. The movement amount (operation amount) of the headrest front portion 12b to be moved is stored in the ROM. That is, the ROM stores the amount of movement of the headrest front portion 12b corresponding to each predetermined angle so that the backset becomes a predetermined value. Here, FIG. 5A and FIG. 5B show an example of the movement amount. 5A and 5B show an example of the movement amount corresponding to each angle of the seat back 14 when the appropriate setback size (predetermined value, target value) is 35 mm. It is shown. Here, the amount of movement indicates the amount of movement of the headrest front portion 12b from the fully closed position 11A toward the fully opened position 11B. In the present embodiment, when the seat back 14 is standing too much (in the example of FIG. 6, the angle of the seat back 14 is less than 20 degrees), or when the seat back 14 is sleeping too much (FIG. 6). In this example, when the angle of the seat back 14 is greater than 28 degrees), the control for keeping the headrest front portion 12b at a predetermined value is not performed, and the movement amount in each case is not stored in the ROM. . Thereby, the resources of the ROM as the storage means can be effectively used.

  The CPU reads the program from the ROM and executes it. Various data are temporarily stored in the RAM.

  The seat back angle sensor 16, the headrest operating amount detection sensor 18, the ignition switch 5, and the motor 28a are connected to the I / O port. The ignition switch 5 outputs a signal indicating ON when ON (ON), and outputs a signal indicating OFF when OFF (OFF).

  Next, a processing routine of a first headrest movement control process executed by the CPU of the headrest control ECU 20 will be described with reference to FIG. Here, the first headrest movement control process is started when electric power is supplied to the headrest control ECU 20 from a power source (not shown). Note that at the start of the first headrest movement control process, the position of the headrest front portion 12b is in the fully closed position 11A.

  First, in step S100, a signal from the ignition switch 5 is taken in, and it is determined whether or not the ignition switch 5 is ON. If it is determined in step S100 that it is ON, the process proceeds to the next step S102. On the other hand, if it is determined in step S100 that it is not ON (that is, it is OFF), the same determination is repeated until it is determined that it is ON.

  In step S102, a detection signal is taken from the seat back angle sensor 16, and the angle of the seat back 14 is detected.

  In the next step S104, the angle detected in step S102 is stored from the information of “the amount of movement of the headrest front portion 12b corresponding to each angle predetermined so that the backset becomes a predetermined value” stored in the ROM. The movement amount of the headrest front part 12b is estimated by acquiring the movement amount of the headrest front part 12b corresponding to the above.

  In the next step S106, whether or not a condition for performing control so that the size of the backset becomes an optimal value by moving the headrest front portion 12b according to the angle of the seat back 14 is satisfied. Determine. As such a determination, for example, in step S106, when the angle of the seat back 14 is less than a first predetermined value (for example, 20 degrees), the seat back 14 is standing too much and the above control needs to be performed. Therefore, even when it is determined that the above condition is not satisfied and the angle of the seat back 14 is larger than a second predetermined value (for example, 28 degrees) that is larger than the first predetermined value, If the angle of the seat back 14 is not less than the first predetermined value and less than the second predetermined value, it is determined that the above condition is not satisfied. It is determined that the above condition is satisfied.

  In addition to this determination method, there are various determination methods in step S106. For example, in step S106, when it is detected that the change in the angle of the seat back 14 per unit time is greater than or equal to the third predetermined value α based on the detected time-series data of the angle of the seat back 14. May determine that the above condition is not satisfied even when the angle of the seat back 14 is not less than the first predetermined value and less than the second predetermined value. This is because the angle of the seat back 14 is greater than or equal to the first predetermined value when the occupant vigorously contacts the seat back 14 or the occupant of the rear seat grabs the seat back 14 trying to get into the vehicle. This is because, when it becomes less than the second predetermined value, it is not necessary to perform the control. Further, in step S106, based on the detected time-series data of the angle of the seat back 14, it can be detected that the change in the angle of the seat back 14 per unit time is less than the third predetermined value α, and the seat When the angle of the back 14 is not less than the first predetermined value and less than the second predetermined value, it may be determined that the condition is satisfied.

  If it is determined in step S106 that the above condition is satisfied, the process proceeds to the next step S108. On the other hand, if it is determined in step S106 that the above condition is not satisfied, the process proceeds to the next step S114.

  In step S108, the headrest front portion 12b starts to move from the fully closed position 11A to the fully open position 11B. More specifically, the motor 28a is controlled so that the headrest front portion 12b starts to move toward the fully open position 11B. Thereby, the headrest front part 12b starts to move in the direction of the fully open position 11B.

  In the next step S110, a detection signal from the headrest actuation amount detection sensor 18 is captured, and it is determined whether or not the movement amount indicated by the captured detection signal matches the movement amount estimated in step S104. Thereby, when it is determined that the movement amount indicated by the captured detection signal coincides with the movement amount estimated in step S104, the headrest front portion 12b moves by the movement amount estimated from the fully closed position 11A. It can be determined that it has moved in the direction of 11B. If it is determined that the amount of movement indicated by the captured detection signal does not match the amount of movement estimated in step S104, the headrest front portion 12b is fully opened by the amount of movement estimated from the fully closed position 11A. It can be determined that it has not moved in the direction of the position 11B.

  If it is determined in step S110 that the movement amount indicated by the captured detection signal matches the movement amount estimated in step S104, the process proceeds to the next step S112. On the other hand, if it is determined in step S110 that the movement amount indicated by the captured detection signal does not match the movement amount estimated in step S104, the determination is repeated until it is determined that they match. Process.

  In step S112, the motor 28a is controlled so that the movement of the headrest front portion 12b is stopped. Thereby, the movement of the headrest front portion 12b is stopped, and the size of the backset becomes an appropriate size (predetermined value, target value).

  In the next step S114, a signal from the ignition switch 5 is taken in, and it is determined whether or not the ignition switch 5 is OFF. If it is determined in step S114 that it is OFF, the process proceeds to the next step S116. On the other hand, if it is determined in step S114 that it is not OFF (that is, it is ON), the same determination process is repeated until it is determined that it is OFF.

  In the next step S116, the headrest front portion 12b is moved to the fully closed position 11A and stored by controlling the motor 28a to move the headrest front portion 12b to the fully closed position 11A. Then, the first headrest movement control process ends.

  As described above, according to the first headrest movement control process, the backset is set to a predetermined value (this embodiment) based on the angle detected by the seatback angle sensor 16 serving as an angle detection unit that detects the angle of the seatback. Then, the movement of the headrest front part 12b is controlled so as to be 35 mm as an example. More specifically, at a predetermined angle such that a backset that is a horizontal distance between the head of the occupant A and the headrest body 12 (more specifically, the headrest front portion 12b) becomes a predetermined value. Based on the amount of movement of the headrest front portion 12b corresponding to the angle detected by the seatback angle sensor 16 stored in the ROM that stores the amount of movement of the corresponding headrest front portion 12b, the headrest front portion 12b is moved to the fully closed position 11A. To move toward the fully open position 11B by the amount of movement. Thereby, even if the occupant A is seated on the seat 40 and the angle of the seat back 14 is changed by appropriately determining the predetermined value, the position of the headrest body 12 (the position of the headrest front portion 12b) is changed to the occupant A. Therefore, the position can be set so that the head is comfortable and the restraint of the head of the passenger A is high.

[Second Embodiment]
Next, a headrest device 10 'according to a second embodiment will be described. In addition, about the structure and process similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 8, the difference between the headrest device 10 of the first embodiment and the headrest device 10 'of the second embodiment is that the vertical direction of the floor surface of the vehicle on which the seat 40 is mounted is shown. A processing routine of a second headrest movement control process, which will be described in detail below, is executed in the point that a floor angle sensor 50 for detecting an angle is further provided in the headrest device 10 ′ and the ROM of the headrest control ECU 20. The program for memorizing is stored.

  The floor angle sensor 50 detects an angle of the vehicle floor 70 (see FIG. 6) with respect to the vertical direction, and outputs a detection signal indicating the detected angle to the headrest control ECU 20. The floor angle sensor 50 may be configured to include, for example, an existing gyro sensor provided in an existing car navigation device mounted on a vehicle. Thus, it becomes possible to hold down cost by detecting the angle with respect to the vertical direction of the floor of a vehicle using an existing sensor.

  Next, a processing routine of a second headrest movement control process executed by the CPU of the headrest control ECU 20 will be described with reference to FIG. Here, the second headrest movement control process is started when power is supplied to the headrest control ECU 20 from a power source (not shown). Note that at the start of the second headrest movement control process, the position of the headrest front portion 12b is in the fully closed position 11A.

  In the present embodiment, it is determined whether or not the ignition switch 5 is ON in step S100. If it is determined that the ignition switch 5 is ON in step S100, the process proceeds to the next step 101. In step 101, a detection signal is acquired from the floor angle sensor 50, and an angle with respect to the vertical direction of the floor surface of the vehicle on which the seat 40 is mounted is detected. Then, the process proceeds to step S102.

  In step S102, a detection signal is taken from the seat back angle sensor 16, and the angle of the seat back 14 is detected.

  In the next step S104, first, the angle is corrected by calculating a value obtained by subtracting the angle detected in step S101 from the angle detected in step S102 as a correction angle. This is because, when the vehicle is located on a road surface inclined with respect to a horizontal direction other than a horizontal plane such as a slope, a more appropriate movement amount is estimated in consideration of the inclination of the vehicle. Thus, in step S104, first, a value obtained by correcting the angle detected in step S102 with the angle detected in step S101 is calculated as a correction angle. Then, a corrected angle obtained as a result of calculation from information of “amount of movement of the headrest front portion 12b corresponding to each angle predetermined so that the backset becomes a predetermined value” stored in the ROM ( The movement amount of the headrest front portion 12b is estimated by acquiring the movement amount of the headrest front portion 12b corresponding to the correction angle.

  Then, as in the first embodiment, the processes of steps S106, S108, S110, and S112 are performed, and in step S115 subsequent to step S112, the signal from the ignition switch 5 is captured, and the ignition switch 5 is turned off. It is determined whether or not. If it is determined in step S115 that it is OFF, the process proceeds to the next step S116. On the other hand, if it is determined in step S115 that it is not OFF (that is, it is ON), the process returns to step S101.

  As described above, according to the second headrest movement control process, the backset is set to a predetermined value based on the angle detected by the seatback angle sensor 16 as the angle detection means for detecting the angle of the seatback 14. The movement of the headrest front part 12b is controlled. More specifically, at a predetermined angle such that a backset that is a horizontal distance between the head of the occupant A and the headrest body 12 (more specifically, the headrest front portion 12b) becomes a predetermined value. Based on the movement amount of the headrest front portion 12b corresponding to the correction angle calculated in step S104, stored in the ROM that stores the movement amount of the corresponding headrest front portion 12b, the headrest front portion 12b is moved to the fully closed position 11A. To move toward the fully open position 11B by the amount of movement. Thereby, even if the occupant A is seated on the seat 40 and the angle of the seat back 14 is changed by appropriately determining the predetermined value (in this embodiment, 35 mm as an example), the position of the headrest body 12 is It is comfortable for the occupant A, and the restraint of the head of the occupant A can be enhanced.

  Further, a correction angle obtained by correcting the angle detected by the seat back angle sensor 16 with the angle detected by the floor angle sensor 50 is calculated, and the head of the occupant A and the headrest body 12 are calculated based on the calculated correction angle. The movement of the headrest front portion 12b is controlled so that the backset, which is the horizontal distance of the vehicle, becomes a predetermined value. For example, the vehicle is positioned on a road surface inclined with respect to a horizontal direction other than a horizontal plane such as a slope. Even if it is, the angle in consideration of the inclination of the vehicle is calculated as the correction angle, and the movement of the headrest front portion 12b is controlled based on the correction angle so that the backset becomes a predetermined value. Considering the inclination of the vehicle, the size of the back set becomes more appropriate.

  In each embodiment, the example of 35 mm is described as an appropriate backset size (predetermined value), but the appropriate backset size is not limited to this. For example, various values such as 32 mm and 37 mm are conceivable.

  Moreover, although each embodiment demonstrated the example which detects the angle of the seat back 14 with respect to a perpendicular direction, and the angle of the floor surface of a vehicle with respect to a perpendicular direction, this invention is not limited to this. For example, the angle of the seat back 14 or the angle of the vehicle floor with respect to a predetermined direction (for example, the horizontal direction) may be detected.

  Further, the arrangement positions of the seat back angle sensor 16, the headrest operation amount detection sensor 18, and the headrest control ECU 20 are not limited to the illustrated positions.

DESCRIPTION OF SYMBOLS 2 Drive mechanism 5 Ignition switch 10 Headrest apparatus 12 Headrest main body 12a Headrest rear part 12b Headrest front part 14 Seat back 16 Seat back angle sensor 18 Headrest operation amount detection sensor 20 Headrest control ECU

Claims (6)

A headrest rear portion supported by a seat back provided with a variable angle with respect to a seat on which an occupant is seated, and a fully open position farthest from the fully closed position closest to the headrest rear portion with respect to the headrest rear portion A headrest body having a headrest front portion movable within a predetermined range up to,
Angle detection means for detecting the angle of the seat back;
Based on the angle detected by the angle detection means, a movement control means for controlling the movement of the front portion of the headrest so that a backset, which is a horizontal distance between the head of the occupant and the headrest, has a predetermined value. When,
Headrest device with   The movement control means stores a movement amount of the front portion of the headrest corresponding to each predetermined angle so that a backset which is a horizontal distance between the head of the occupant and the headrest has a predetermined value. Based on the movement amount of the headrest front portion corresponding to the angle detected by the angle detection means stored in the storage means, the headrest front portion is moved from the fully closed position toward the fully opened position by the movement amount. The headrest device according to claim 1, wherein the headrest device is controlled to be controlled. A headrest rear portion supported by a seat back on which an occupant is seated and a variable angle with respect to a seat provided in the vehicle, and a fully closed position closest to the rear portion of the headrest, to the rear portion of the headrest A headrest body having a headrest front portion movable within a predetermined range up to the most fully open position,
Angle detection means for detecting an angle of the seat back with respect to a predetermined direction;
Floor surface angle detection means for detecting an angle of the floor surface on which the seat of the vehicle is mounted with respect to the predetermined direction;
A calculation means for calculating a correction angle obtained by correcting the angle detected by the angle detection means with the angle detected by the floor surface angle detection means;
Based on the correction angle calculated by the calculation means, a movement control means for controlling the movement of the front portion of the headrest so that a backset that is a horizontal distance between the head of the occupant and the headrest has a predetermined value. When,
Headrest device with   The movement control means stores a movement amount of the front portion of the headrest corresponding to each predetermined angle so that a backset which is a horizontal distance between the head of the occupant and the headrest has a predetermined value. Based on the movement amount of the headrest front portion corresponding to the correction angle calculated by the calculation means stored in the storage means, the headrest front portion is moved from the fully closed position toward the fully opened position by the movement amount. The headrest device according to claim 3, wherein the headrest device is controlled to be controlled.   The headrest device according to claim 3 or 4, wherein the correction angle is a value obtained by subtracting the angle detected by the floor surface angle detection means from the angle detected by the angle detection means.   The headrest device according to any one of claims 3 to 5, wherein the floor surface angle detection means includes a gyro sensor provided in a car navigation device mounted on the vehicle.

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