Vehicle seats, headrests, and head support members

Abstract

To provide a vehicle seat which inhibits complication of the structure and inhibits an occupant from getting motion sickness.SOLUTION: A vehicular seat 10 includes: a seat cushion which supports a hip of a seated occupant from the seat lower side; a seat back 22 which supports a back of the seated occupant from the seat rear side; and a headrest 24S1 which supports a head of the seated occupant from the seat rear side. The headrest 24S1 is provided with a head support part 38. The head support part 38 supports portions corresponding to an occipital bone in the head of the seated occupant from a seat lateral direction. Further, the head support part 38 supports the portions corresponding to the occipital bone in the head of the seated occupant from the seat rear side in a forward direction and a seat obliquely upward direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vehicle seat, a headrest, and a head support member.

Background Art

[0002] Patent Document 1 below discloses a vehicle seat provided with a mechanism for suppressing motion sickness of a passenger. The headrest of the vehicle seat described in this document includes a main part that supports the rear surface of the passenger's head, a left side part rotatably connected to the left edge of the main part with the vertical direction as the axial direction, and a right side part rotatably connected to the right edge of the main part with the vertical direction as the axial direction. Further, this headrest includes a left drive device that rotates the left side part forward with respect to the main part, and a right drive device that rotates the right side part forward with respect to the main part. When an acceleration to the left occurs, the left side part is rotated forward by the left drive device, so that the movement of the passenger's head to the left is restricted by the left side part. When an acceleration to the right occurs, the right side part is rotated forward by the right drive device, so that the movement of the passenger's head to the right is restricted by the right side part. Thus, by controlling the posture of the passenger's head, the passenger's motion sickness is suppressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the configuration described in Patent Document 1 above is a useful configuration from the viewpoint of suppressing a passenger's motion sickness, but a mechanism for rotating a part of the headrest according to accelerations to the right and left is required, and the configuration has become complicated.

[0005] The present invention aims to provide a vehicle seat, headrest, and head support member that can suppress motion sickness in occupants while taking the above facts into consideration. [Means for solving the problem]

[0006] A vehicle seat according to the first embodiment comprises a seat cushion that supports the buttocks of a seated occupant from below the seat, a seat back that supports the back of the seated occupant from the rear of the seat, a headrest that supports the head of the seated occupant from the rear of the seat, and a head support portion provided on the headrest that supports the portion of the seated occupant's head corresponding to the occipital bone from the left and right directions of the seat, and also supports the head from the rear of the seat toward the front and diagonally upward of the seat, wherein the head support portion is provided on both the left and right sides of the headrest body that supports the head of the seated occupant from the rear of the seat, respectively The seat is provided with a left side support portion and a right side support portion that protrude toward the head of the seated occupant and support the portion of the occipital bone of the seated occupant's head below the superior nuchal line and behind the mastoid process of the seated occupant's head, sandwiching it from the left-right direction of the seat. A recess is formed between the left side support portion and the right side support portion, with the head of the seated occupant being open. The surfaces of the left side support portion and the right side support portion that form the inside of the recess are formed in a V-shape when viewed from a direction perpendicular to the direction of opening of the recess and the left-right direction of the seat.

[0007] In the first embodiment of the vehicle seat, the seated occupant's buttocks, back, and head are supported by the seat cushion, seat back, and headrest. Furthermore, the portion of the seated occupant's head corresponding to the occipital bone is supported from the left and right sides of the seat by the head support, as well as from the rear of the seat in a forward and diagonally upward direction. This effectively suppresses the occupant's head movement, thereby suppressing motion sickness. Thus, motion sickness in seated occupants can be suppressed by a simple configuration that includes a head support.

[0008] In the second embodiment of the vehicle seat, the shape and dimensions of the head support portion are set such that, when acceleration acts on the seated occupant to the right of the seat, the contact pressure between the head support portion and a first portion corresponding to the occipital bone of the seated occupant's head increases, and when acceleration acts on the seated occupant to the left of the seat, the contact pressure between the head support portion and a second portion corresponding to the occipital bone and at the same height as the first portion of the seated occupant's head increases.

[0009] In the second embodiment of the vehicle seat, when an acceleration to the right of the seat acts on the seated occupant, the contact pressure between the first part of the occupant's head corresponding to the occipital bone and the head support increases. Furthermore, when an acceleration to the left of the seat acts on the seated occupant, the contact pressure between the second part of the occipital bone corresponding to the occipital bone and the head support increases. In this way, by increasing the contact pressure between the first and second parts of the occipital bone, which are at the same height as the occipital bone, and the head support, the swaying of the seated occupant's head can be effectively suppressed.

[0010] According to the first embodiment of the vehicle seat, the shape and dimensions of the head support portion are set as described above, so that when the upper body of the seated occupant is far from the center of the seat, the head support portion can be released from supporting the head. In the third embodiment of the vehicle seat, in the vehicle seat of the first or second embodiment, the amount of protrusion of the left side support portion and the right side support portion from the headrest body portion gradually increases from the upper side of the seat to the lower side. The fourth embodiment of the vehicle seat is the vehicle seat of the second embodiment, wherein the distance between the first part and the second part in the left-right direction of the seat is approximately 60 mm.

[0011] A fifth embodiment of a vehicle seat is a vehicle seat according to any one embodiment of the first to fourth embodiments, wherein the headrest comprises a headrest body and a head support portion supported by the headrest body, and the head support portion is displaceable between a state in which it is stored in the headrest body and a state in which it protrudes forward of the seat relative to the headrest body.

[0012] According to the fifth embodiment of the vehicle seat, the head support portion is displaceable between a state in which it is stored in the headrest body and a state in which it protrudes forward relative to the headrest body. This allows the head support portion to be stored in the headrest body when it is not needed.

[0013] The sixth embodiment of the headrest comprises a headrest body that supports the head of a seated occupant from the rear side of the seat, and a head support portion supported by the headrest body that supports the portion of the seated occupant's head corresponding to the occipital bone from the left-right direction of the seat, and also supports the portion from the rear side of the seat in a forward direction and diagonally upward direction of the seat, wherein the head support portion comprises a left side support portion and a right side support portion that protrude from both the left and right sides of the headrest body toward the head of the seated occupant, respectively, and support the portion of the occipital bone of the seated occupant's head below the superior nuchal line and toward the rear of the mastoid process of the seated occupant's head by sandwiching it from the left-right direction of the seat, wherein a recess is formed between the left side support portion and the right side support portion, with the side toward the head of the seated occupant being open, and the surfaces forming the inside of the recess in the left side support portion and the right side support portion are formed in a V shape when viewed from a direction perpendicular to the direction of opening of the recess and the left-right direction of the seat.

[0014] According to the sixth embodiment of the headrest, the head of the seated occupant of the vehicle seat is supported by the headrest body. Furthermore, the portion of the seated occupant's head corresponding to the occipital bone is supported from the left and right directions of the seat by the head support portion, as well as from the rear of the seat in a forward and diagonally upward direction. As a result, the movement of the seated occupant's head is effectively suppressed, and motion sickness is suppressed in the seated occupant. In this way, motion sickness in the seated occupant can be suppressed by a simple configuration that includes a head support portion.

[0015] The head support member of the seventh embodiment comprises a mounting portion attached to a vehicle seat, and a head support portion which is fixed to the vehicle seat by the mounting portion being attached to the vehicle seat, and which supports the portion of the seated occupant's head corresponding to the occipital bone from the left and right directions of the seat, and also supports the portion from the rear of the seat in a forward direction and diagonally upward direction of the seat, wherein the head support portion protrudes toward the seated occupant's head from both the left and right sides of the headrest body that supports the seated occupant's head from the rear of the seat, and supports the occipital bone of the seated occupant's head The seat is equipped with left and right side support sections that support the portion below the upper nodal line and behind the mastoid protrusion of the seated occupant's head, sandwiching it from the left-right direction. Between the left and right side support sections, a recess is formed, with the seated occupant's head side open. The surfaces forming the inside of the recess in the left and right side support sections are V-shaped when viewed from a direction perpendicular to the opening direction of the recess and the left-right direction of the seat.

[0016] In the head support member according to the seventh aspect, the attachment portion is attached to the vehicle seat, so that the head support portion is fixed to the vehicle seat. Further, a portion corresponding to the occipital bone in the head of the seated occupant of the vehicle seat is supported from the left and right directions of the seat by the head support portion and is supported from the rear side of the seat in the forward direction and obliquely upward direction of the seat. Thereby, the rocking of the head of the seated occupant is effectively suppressed, and the motion sickness of the seated occupant is suppressed. Thus, the motion sickness of the seated occupant can be suppressed by a simple configuration of attaching the head support member to the vehicle seat.

Effect of the Invention

[0017] The vehicle seat and the head support member for the vehicle seat according to the present invention have an excellent effect that the motion sickness of the occupant can be suppressed while suppressing the complication of the configuration.

Brief Description of the Drawings

[0018] [Figure 1] It is a perspective view showing a vehicle seat fixed on a vibrator. [Figure 2] It is a side view showing a vehicle seat set in an upright posture and an occupant sitting on this vehicle seat. [Figure 3] It is a perspective view showing the vehicle seat of the present embodiment. [Figure 4] It is a rear view of the head seen from the rear side. [Figure 5] It is a side view of the head seen from the left side. [Figure 6] It is a graph showing the results of the motion sickness evaluation test of the vehicle seat of the comparative example and the vehicle seat of the present embodiment. [Figure 7] It is a view showing the route of the actual vehicle running test. [Figure 8] It is a graph showing the results of the actual vehicle running test of the vehicle seat of the comparative example and the vehicle seat of the present embodiment. [Figure 9] It is a perspective view showing the head support member. [Figure 10]It is a perspective view showing the headrest of the second embodiment, showing the state in which the head support part is stored. [Figure 11] It is a perspective view showing the headrest of the second embodiment, showing the state in which a part of the head support part is pulled out from the headrest main body part. [Figure 12] It is a perspective view showing the headrest of the second embodiment, showing the state in which the head support part can be used. [Figure 13] It is a perspective view showing the headrest of the third embodiment, showing the state in which the head support part is stored. [Figure 14] It is a perspective view showing the headrest of the third embodiment, showing the state in which the head support part can be used.

Modes for Carrying Out the Invention

[0019] (Background and Purpose of Development) First, the background and purpose of the development of the vehicle seat 10 (see FIG. 3) according to the embodiment of the present invention will be described.

[0020] In recent years, with the advancement of vehicle automation, concerns have been increasing that motion sickness during vehicle automation may become more serious. It is known that this motion sickness is caused by a sensory conflict between the vestibular organ and vision when the head of the occupant swings. In addition to this, it is known that this motion sickness can be reduced by reducing the amount of sensory deviation between the vestibular organ and vision of the occupant. Therefore, the purpose of the development is to reduce motion sickness by suppressing the swinging of the occupant's head, which is the cause of motion sickness.

[0021] (Evaluation Method of Motion Sickness) Next, the evaluation method of motion sickness will be described.

[0022] As shown in Figure 1, motion sickness is evaluated by vibrating the vibration device 12 in the left-right direction of the seat while the occupant is seated in a vehicle seat 18 fixed on the vibration device 12. This test is called the "motion sickness evaluation test." The arrows FR, UP, RH, and LH in the figure indicate the front, top, right, and left sides of the seat, respectively, as seen from the perspective of the occupant seated in the vehicle seat. Hereafter, when simply referring to the front-back, up-down, and left-right directions, unless otherwise specified, they refer to the front-back direction of the seat, the up-down direction of the seat, and the left-right direction of the seat.

[0023] In this motion sickness evaluation test, the vehicle seat 18 is repeatedly vibrated from side to side between a position tilted 10° to the left and a position tilted 10° to the right in the vertical direction. The vibration frequency is 0.1 Hz, and the vibration duration is 30 minutes. The motion sickness evaluation test was also conducted in the upright position shown in Figure 2. The upright position is, for example, the position in which occupant P is seated in the vehicle seat 18 in a position in which they can operate the vehicle manually. That is, the position in which occupant P is seated in the vehicle seat 18 in a position in which they can operate the steering wheel. Here, the configuration of the vehicle seat 18 will be briefly explained. The vehicle seat 18 includes a seat cushion 20 that supports the seated occupant's buttocks from below, a seat back 22 that supports the seated occupant's back from the rear, and a headrest 24 that supports the seated occupant's head from the rear. The seat back 22 is reclined in the front-to-back direction relative to the seat cushion 20. This makes it possible to adjust the reclining angle of the seat back 22 relative to the seat cushion 20. In addition, the vehicle seat 18 in the comparative example is equipped with a pair of left and right armrests 26 that are supported on both the left and right sides of the seat back 22 so as to be tiltable in the front-to-back direction.

[0024] Furthermore, motion sickness was evaluated in the motion sickness evaluation test based on the sensory evaluation of occupant P.

[0025] In the sensory evaluation, the vehicle seat 18 was scored based on the sensations of occupant P during vibration. This score (rating) is the average value over 30 minutes during vibration. The following table shows the correspondence between the ratings and the occupant's sensations. [Table 1]

[0026] (Development of vehicle seats that are effective in suppressing motion sickness) The configuration and effects of the vehicle seat 10 of this embodiment will be described below. In this embodiment, parts of the vehicle seat 10 that correspond to the vehicle seat 18 described above are denoted by the same reference numerals as those of the vehicle seat 18, and their descriptions will be omitted.

[0027] (Configuration of the vehicle seat 10 in this embodiment) As shown in Figure 3, the vehicle seat 10 of this embodiment includes a seat cushion (not shown), a seat back 22, and a headrest 24S1. As shown in Figures 3 to 5, the headrest 24S1 of this vehicle seat 10 is provided with a head support portion 38 that supports the left and right portions of the head P1 of the seated occupant P, corresponding to the occipital bone P2, by sandwiching them from the left and right directions, and also supports the portion of the head P1 of the seated occupant P, corresponding to the occipital bone P2, from the rear in a forward direction and diagonally upward towards the seat. Here, in setting the shape and dimensions of the head support portion 38, the skull of the Sam Skeleton Model ~Super Skeleton~, upright stand type (product number: A13), sold by Japan Three B Scientific Co., Ltd., was used.

[0028] More specifically, as shown in Figure 3, the headrest 24S1 comprises a headrest body 40 formed in a roughly rectangular block shape with a headrest stay positioned inside, and a head support portion 38 formed integrally with the headrest body 40 at the front of the headrest body 40. The dimensions of the headrest body 40 in the left-right direction gradually decrease towards the downward side. As a result, the shape of the headrest body 40 when viewed from the front is roughly an inverted trapezoid.

[0029] The head support portion 38 is formed using a pad that is harder than the headrest body portion 40. The head support portion 38 includes a left side support portion 38AL and a right side support portion 38AR that protrude forward and diagonally upward from both the left and right sides of the lower part of the headrest body portion 40. The amount of protrusion of the left side support portion 38AL and the right side support portion 38AR from the headrest body portion 40 is set to gradually increase from the upper side to the lower side, and to gradually decrease from the most protruding part toward the lower side. In addition, a recess 38B is formed in the front part of the head support portion 38, which is open toward the front and diagonally upward side. The inner surface of this recess 38B is curved in a roughly U-shape when viewed from a direction perpendicular to the opening direction and the left-right direction of the recess 38B. Furthermore, a portion of the inner surface of the recess 38B is the surface on the left side support portion 38AL and the right side support portion 38AR that faces the head P1 of the seated occupant P (see Figures 4 and 5). In addition, the inner surface of the recess 38B may be formed in a substantially V-shape when viewed from a direction perpendicular to the opening direction and the left-right direction of the recess 38B.

[0030] As shown in Figures 3 to 5, when the occupant P is seated in the vehicle seat 10, the occupant P's head P1 is positioned within the recess 38B of the head support 38, thereby suppressing the lateral movement of the occupant P's head P1. Furthermore, when the occupant P's head P1 is positioned within the recess 38B of the head support 38, the left side support 38AL and the right side support 38AR overlap in the lateral direction with the portion of the occipital bone P2 on the occupant P's head P1 when viewed from the side of the seat (viewed from the left or right side). In addition, when the occupant P's head P1 is positioned within the recess 38B of the head support 38, the left side support 38AL and the right side support 38AR do not overlap in the lateral direction with the temporal region P1 on the occupant P's head P1 when viewed from the side of the seat. In other words, when the head P1 of the seated occupant P is positioned within the recess 38B of the head support 38, the shape and dimensions of the head support 38 are set such that the head support 38 supports only the part of the seated occupant P's head P1 that is posterior to the temporal region P1. More specifically, when the head P1 of the seated occupant P is positioned within the recess 38B of the head support 38, the shape and dimensions of the head support 38 are set such that the head support 38 supports only the part of the seated occupant P's head P1 that is posterior to the mastoid process P3. Furthermore, when the head P1 of the seated occupant P is positioned within the recess 38B of the head support 38, the shape, dimensions, and hardness of the head support 38 are set such that the contact pressure between the first part P4R, which corresponds to the occipital bone P2 on the seated occupant P's head P1, and the head support 38 increases. Furthermore, the shape, dimensions, and hardness of the head support portion 38 are set such that when the head P1 of the seated occupant P is positioned within the recess 38B of the head support portion 38 and a leftward acceleration is applied to the seated occupant P, the contact pressure between the second portion P4L, which corresponds to the occipital bone P2, and the head support portion 38 increases. Here, the first portion P4R and the second portion P4L correspond to the left and right sides of the lower end of the occipital bone P2, respectively. The lower end of the occipital bone P2 refers to the portion of the occipital bone P2 below the supranuclear line P5.Furthermore, when the head P1 of the seated occupant P is facing forward, the first part P4R and the second part P4L are at the same height. Also, the distance between the first part P4R and the second part P4L in the lateral direction is approximately 60 mm.

[0031] (Operation and effects of the vehicle seat 10 of this embodiment) Next, the operation and effects of the vehicle seat 10 of this embodiment will be described.

[0032] (Evaluation based on motion sickness assessment tests) To confirm the operation and effects of the vehicle seat 10 of this embodiment, motion sickness evaluation tests were conducted on the vehicle seat 10 of this embodiment and the vehicle seat 18 of a comparative example.

[0033] Figure 6 shows the results of motion sickness evaluation tests conducted on the vehicle seat 10 of this embodiment and the vehicle seat 18 of the comparative example (see Figure 1). In the motion sickness evaluation tests, 12 people evaluated the two seat specifications a total of 24 times. The results for each vehicle seat shown in Figure 6 are the average values ​​of the results of the 24 motion sickness evaluation tests. The results for the vehicle seat 18 of the comparative example are denoted by the symbol R1, and the results for the vehicle seat 10 of this embodiment are denoted by the symbol R2.

[0034] As shown in Figure 6, the vehicle seat 10 of this embodiment shows improved motion sickness evaluation compared to the vehicle seat 18 of the comparative example. This evaluation was determined using the Wilcoxon test (significant difference found (significance level 1%)).

[0035] As described above, the motion sickness evaluation test of the vehicle seat 10 of this embodiment confirmed that it can reduce motion sickness in seated occupants P.

[0036] (Evaluation based on actual vehicle driving tests) Next, a vehicle driving test was conducted on the vehicle seat 10 of this embodiment using an actual vehicle. This vehicle driving test is referred to as a real-vehicle driving test. This real-vehicle driving test was also conducted on the comparative vehicle seat 18.

[0037] The actual vehicle driving test was conducted by repeatedly driving in the order of arrows D1 to D4 on the map shown in Figure 7. Specifically, on the route indicated by arrow D1, the vehicle drove in the order of 50m straight, right turn, 160m straight, right turn, 50m straight, right turn, and 160m straight. Next, after turning left, the vehicle drove on the route indicated by arrow D2. On the route indicated by arrow D2, the vehicle drove in the order of 50m straight, left turn, 160m straight, left turn, 50m straight, left turn, and 160m straight. Next, after turning left, the vehicle drove on the route indicated by arrow D3. On the route indicated by arrow D3, the vehicle drove in the order of 50m straight, right turn, 160m straight, right turn, 50m straight, right turn, and 160m straight. Next, after turning left, the vehicle drove on the route indicated by arrow D4. Following the route indicated by arrow D4, the vehicle travels in the following order: 50m straight, turn left, 160m straight, turn left, 50m straight, turn left, and 160m straight. After that, after turning left, the vehicle repeatedly travels the route indicated by arrows D1 to D4.

[0038] Figure 8 shows the results of actual vehicle driving tests conducted on the vehicle seat 10 of this embodiment and the vehicle seat 18 of the comparative example (see Figure 1). In the actual vehicle driving tests, eight people evaluated the two seat specifications a total of 16 times. The results for each vehicle seat shown in Figure 8 are the average values ​​of the results of each of the 16 actual vehicle driving tests. The results for the vehicle seat 18 of the comparative example are denoted by the symbol T1, and the results for the vehicle seat 10 of this embodiment are denoted by the symbol T2.

[0039] As shown in Figure 8, the vehicle seat 10 of this embodiment performed better than the comparative vehicle seat 18 in motion sickness evaluations during actual vehicle driving tests. Thus, the motion sickness reduction effect of the vehicle seat 10 of this embodiment was confirmed in actual vehicle driving tests. This evaluation was determined using the Wilcoxon test (statistically significant (significance level 1%)).

[0040] (Summary of the operation and effects of the vehicle seat 10 of this embodiment) Based on the results above, the vehicle seat 10 of this embodiment can effectively reduce motion sickness in seated occupants by simply providing the head support portion 38 with the aforementioned configuration on the headrest 24S1. In other words, motion sickness in occupants can be suppressed while preventing the configuration of the vehicle seat 10 from becoming overly complex.

[0041] Furthermore, in the vehicle seat 10 of this embodiment, when the head P1 of the seated occupant P is positioned within the recess 38B of the head support portion 38, the head support portion 38 supports only the portion of the seated occupant P's head P1 that is rearward of the temporal portion P1. This makes it possible to suppress excessive support of the head P1, for example, during a side collision of the vehicle. In other words, if the upper body of the seated occupant P is significantly off-center from the seat, the head support portion 38 can release its support of the head P1.

[0042] Furthermore, in the vehicle seat 10 of this embodiment, when acceleration in the left-right direction is applied while the head P1 of the seated occupant P is positioned within the recess 38B of the head support portion 38, the contact pressure increases at two locations (first portion P4R and second portion P4L) at the same height on the left and right sides of the head P1 of the seated occupant P, corresponding to the occipital bone P2. This effectively suppresses the oscillation of the head P1 of the seated occupant P while suppressing dependence on the protrusion amount of the left side support portion 38AL and the right side support portion 38AR.

[0043] In the vehicle seat 10 described above, an example was described in which the head support portion 38 is formed integrally with the headrest 24S1, but the present invention is not limited to this. For example, as shown in Figure 9, the head support member 42 may be attached to and fixed to the vehicle seat so that the same effects as the vehicle seat 10 described above can be obtained. The head support member 42 shown in Figure 9 comprises a head support portion 38 having the same configuration as the vehicle seat 10 of this embodiment, and a strip-shaped attachment portion 44 extending from the head support portion 38. The strip-shaped attachment portion 44 is attached to the headrest, headrest stay, seat back, etc. In this way, the head support member 42 is fixed to the vehicle seat.

[0044] (The head support section 38 can be stored in the headrest body section 40.) Next, a configuration will be described in which the head support portion 38 can be stored in the headrest body portion 40 when it is not needed. The headrest 24S1 of the vehicle seat 10 of this embodiment described above will be referred to as the headrest 24S1 of the first embodiment. The two types of headrests 24S2 and 24S3 described below will be referred to as the headrest 24S2 of the second embodiment and the headrest 24S3 of the third embodiment. In addition, in the headrest 24S2 of the second embodiment and the headrest 24S3 of the third embodiment, the members and parts corresponding to the headrest 24S1 of the first embodiment will be denoted by the same reference numerals as the members and parts corresponding to the headrest 24S1 of the first embodiment, and their descriptions may be omitted.

[0045] (Headrest 24S2 of the second embodiment) As shown in Figures 10 to 12, the headrest 24S2 of the second embodiment comprises a headrest body 40 and a head support 38 that is tiltably supported on the headrest body 40.

[0046] At the lower end of the headrest body 40, in the center of the left and right sides, there is a recessed storage compartment 40A that is open on the front side.

[0047] The head support portion 38 is formed in the shape of a rectangular parallelepiped with the left-right direction as its longitudinal direction. The central part of the head support portion 38 in the left-right direction is bendable via a first hinge member (not shown). This makes it possible to bend the head support portion 38 into a roughly V-shape with the front side open. Furthermore, by activating a first stopper mechanism (not shown), it is possible to maintain the head support portion 38 in the V-shaped bent state.

[0048] Furthermore, a second hinge member (not shown) is provided between the head support portion 38 and the headrest body portion 40. This allows the head support portion 38 to be tilted forward and diagonally upward towards the seat. Additionally, by activating a second stopper mechanism (not shown), the head support portion 38 can be kept in the tilted position described above.

[0049] In the second embodiment of the headrest 24S2 described above, as shown in Figure 10, the head support portion 38 can be stored in the storage portion 40A of the headrest body 40. When using the head support portion 38, as shown in Figure 11, the left and right ends of the head support portion 38 are pulled forward from the storage portion 40A, causing the head support portion 38 to bend into a V shape. Next, as shown in Figure 12, the V-shaped bent head support portion 38 is tilted forward and diagonally upward towards the seat. This allows the left side support portion 38AL and the right side support portion 38AR to protrude from the headrest body 40, making the head support portion 38 usable.

[0050] (Headrest 24S3 of the third embodiment) As shown in Figures 13 and 14, the headrest 24S3 of the third embodiment comprises a headrest body 40 and a head support 38 rotatably supported on the headrest body 40.

[0051] At the lower end of the headrest body 40, recessed storage compartments 40A are formed in the center of the left and right sides, with the front and lower sides open.

[0052] The head support portion 38 is formed in a block shape with its longitudinal direction running horizontally. The majority of the head support portion 38 is located within the storage portion 40A of the headrest body portion 40, and is supported by the headrest body portion 40 so as to be rotatable in the axial direction horizontally. A recess 38B is formed on a portion of the head support portion 38 on the radially outer side in the rotational direction. Furthermore, the portion of the head support portion 38 opposite to the side where the recess 38B is formed is a curved portion 38C that is curved in the circumferential direction of rotation of the head support portion 38.

[0053] In the headrest 24S3 of the third embodiment described above, as shown in Figure 13, the head support portion 38 can be stored in the storage portion 40A of the headrest body 40. In this state, only the curved portion 38C of the head support portion 38 is visible. When using the head support portion 38, as shown in Figure 14, the head support portion 38 is rotated. This allows the left side support portion 38AL and the right side support portion 38AR to protrude from the headrest body 40, making the head support portion 38 usable.

[0054] Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above, and can be implemented in various other ways without departing from the spirit of the invention. [Explanation of Symbols]

[0055] 10 Vehicle seats 20 Seat Cushions 22 Seatback 24S1 headrest and, 24S2 headrest and, 24S3 headrest and, 38 Head support 40 Headrest main body 42 Head support member 44 Mounting part P Crew P1 head P2 occipital bone P3 Mastoid process P4R 1st part P4L 2nd part

Claims

1. A seat cushion that supports the seated occupant's buttocks from below the seat, A seatback that supports the back of the seated occupant from the rear side of the seat, A headrest that supports the head of the seated occupant from the rear of the seat, The headrest includes a head support portion that supports the portion of the seated occupant's head corresponding to the occipital bone from the left-right direction of the seat, Equipped with, The head support portion includes a left side support portion and a right side support portion that support the head of the seated occupant from the left-right direction, sandwiching the portion behind the mastoid protrusion of the head. The surfaces of the left and right side support portions that support the head of the seated occupant have inclined surfaces that slope from the outside in the seat width direction to the inside in the seat width direction, from the upper side of the seat to the lower side of the seat, and that slope towards the rear of the seat from the outside in the seat width direction to the inside in the seat width direction. Vehicle seats.

2. The vehicle seat according to claim 1, wherein the head support portion supports the portion of the occipital bone of the seated occupant's head that is below the superior nuchal line.

3. A headrest that supports the head of a seated occupant from the rear of the seat, The seat is equipped with a head support that supports the portion of the seated occupant's head corresponding to the occipital bone from the left-right direction. The head support portion includes a left side support portion and a right side support portion that support the head of the seated occupant from the left-right direction, sandwiching the portion behind the mastoid protrusion of the head. The surfaces of the left and right side support portions that support the head of the seated occupant have inclined surfaces that slope from the outside in the seat width direction to the inside in the seat width direction, from the upper side of the seat to the lower side of the seat, and that slope towards the rear of the seat from the outside in the seat width direction to the inside in the seat width direction. Headrest.

4. A mounting part that attaches to a vehicle seat, The mounting portion is fixed to the vehicle seat by being attached to the vehicle seat. A head support section that supports the part of the occupant's head corresponding to the occipital bone from the left and right directions of the seat, Equipped with, The head support portion includes a left side support portion and a right side support portion that support the head of the seated occupant from the left-right direction, sandwiching the portion behind the mastoid protrusion of the head. The surfaces of the left and right side support portions that support the head of the seated occupant have inclined surfaces that slope from the outside in the seat width direction to the inside in the seat width direction, from the upper side of the seat to the lower side of the seat, and that slope towards the rear of the seat from the outside in the seat width direction to the inside in the seat width direction. Head support member.

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