Seat belt webbing

Abstract

In consideration of the above facts, the present invention provides a seat belt webbing that can simplify the installation process of the webbing. [Solution] The webbing 10 includes a first side line portion 11 that extends in the longitudinal direction and is provided on one side in the width direction, a second side line portion 12 that extends in the longitudinal direction and is provided on the other side in the width direction, and a center line portion 13 that extends in the longitudinal direction and is provided between the first side line portion 11 and the second side line portion 12. The first side line portion 11, the second side line portion 12, and the center line portion 13 each have a different absorption rate or reflectance of specific wavelengths of light from the parts other than the first side line portion 11, the second side line portion 12, and the center line portion 13, and the first side line portion 11, the second side line portion 12, and the center line portion 13 are provided on both sides.

Description

Technical Field

[0001] The present invention relates to a webbing for a seat belt.

Background Art

[0002] Patent Document 1 discloses a seat belt wearing state determination device including a seat belt provided with a marker member that reflects or absorbs electromagnetic waves in a specific wavelength band at a ratio different from that of the seat belt material. In the device described in Patent Document 1, the positional relationship between the occupant and the seat belt is grasped by either the marker member or the seat belt.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the seat belt described in Patent Document 1, the marker member is provided only on one surface. Therefore, for example, when installing the seat belt, it is necessary to manage the surface on which the marker member of the seat belt is provided and the surface on which the marker member is not provided. Thus, the seat belt installation work may be complicated.

[0005] In consideration of the above facts, an object of the present invention is to obtain a webbing for a seat belt that can simplify the webbing installation work.

Means for Solving the Problems

[0006] A seat belt webbing according to a first aspect of the present invention is a seat belt webbing formed in the shape of a long strip and woven by interlacing a plurality of warp threads provided along the longitudinal direction and a plurality of weft threads provided along the width direction which is perpendicular to the longitudinal direction, comprising: a first side line portion extending in the longitudinal direction and provided on one side in the width direction; a second side line portion extending in the longitudinal direction and provided on the other side in the width direction; and a center line portion extending in the longitudinal direction and provided between the first side line portion and the second side line portion, wherein the first side line portion, the second side line portion and the center line portion each have a different absorption rate or reflectance of a specific wavelength of light from other parts other than the first side line portion, the second side line portion and the center line portion, and the first side line portion, the second side line portion and the center line portion are provided on both sides.

[0007] In the seat belt webbing according to the second aspect of the present invention, the first side line portion and the center line portion are spaced apart in the width direction, and the end of the first side line portion on the center line portion side is located on the side of the one end rather than the midpoint between the end of the center line portion on the first side line portion side and the one end of the seat belt webbing in the width direction.

[0008] In the third aspect of the present invention, the seat belt webbing is provided such that, in the second or third aspect, the center line portion is provided so as to overlap with the center line extending in the longitudinal direction at the center in the width direction and is provided so as to be symmetrical with respect to the center line, the first side line portion and the second side line portion are provided so as to be symmetrical with respect to the center line, and the first side line portion, the second side line portion and the center line portion are provided so as to be in the same position on both sides.

[0009] In the seat belt webbing according to the fourth aspect of the present invention, in any of the first to third aspects described above, the combined area of ​​the first side line portion, the second side line portion, and the center line portion is smaller than the area of ​​the other portions, and each of the first side line portion, the second side line portion, and the center line portion contains a thread that absorbs light of a specific wavelength, thereby having a different absorption rate or reflectance of light of a specific wavelength than the other portions.

[0010] The seat belt webbing according to the fifth aspect of the present invention, in any of the first to fourth aspects described above, has a plurality of warp threads having a different absorption rate or reflectance of a specific wavelength of light from the other part, and a plurality of weft threads having the same absorption rate or reflectance of a specific wavelength of light as the other part, wherein the density of the plurality of warp threads is higher than the density of the plurality of weft threads. [Effects of the Invention]

[0011] In the seat belt webbing according to the first aspect of the present invention, the first side line portion, the second side line portion, and the center line portion each have different absorption rates or reflectance rates of specific wavelengths of light compared to other portions. As a result, the webbing has multiple regions with different absorption rates or reflectance rates of specific wavelengths of light. This makes it easier to detect the webbing, for example, when a detection device is provided that detects the webbing based on a specific wavelength of light. Therefore, when the webbing with the above configuration is applied to a device that detects whether or not an occupant is wearing the webbing, it becomes easier to detect the webbing.

[0012] Furthermore, in the seat belt webbing according to the first aspect of the present invention, a first side line portion, a second side line portion, and a center line portion are provided on both sides of the webbing. This allows the webbing to be detected from any side. Therefore, it is not necessary to manage the front and back of the webbing. Thus, the installation work of the webbing can be simplified.

[0013] In the seat belt webbing according to the second aspect of the present invention, the end of the first side line portion on the center line portion side is located closer to the one end than the midpoint between the end of the center line portion on the first side line portion side and the one end of the webbing in the width direction. As a result, the distance between the first side line portion and the center line portion becomes relatively long, making it easier to distinguish between the first side line portion and the center line portion. This makes it possible to more preferably detect the webbing when, for example, a detection device that detects the webbing based on light of a specific wavelength is provided.

[0014] In the seat belt webbing according to the third aspect of the present invention, the center line portion is provided so as to be symmetrical with respect to the center line, and the first side line portion and the second side line portion are provided so as to be symmetrical with respect to the center line. Furthermore, the first side line portion, the second side line portion and the center line portion are provided so as to be in the same position on both sides. As a result, the arrangement pattern of the first side line portion, the second side line portion and the center line portion can be the same on both sides of the webbing. Therefore, it is not necessary to manage the front and back of the webbing. Thus, the installation work of the webbing can be simplified.

[0015] In a portion containing threads that absorb specific wavelengths of light, the absorption rate or reflectance of specific wavelengths of light differs from that of a portion without such threads, because the specific wavelengths of light are absorbed by the threads. In the seat belt webbing according to the fourth aspect of the present invention, the first side line portion, the second side line portion, and the center line portion contain threads that absorb specific wavelengths of light. Therefore, the absorption rate or reflectance of specific wavelengths of light can be made different between the first side line portion, the second side line portion, and the center line portion and the other portions.

[0016] Furthermore, in the seat belt webbing according to the fourth aspect of the present invention, the area of ​​the first side line portion, the second side line portion, and the center line portion containing yarn that absorbs specific wavelengths of light is smaller than the area of ​​the other portions. As a result, the amount of yarn that absorbs specific wavelengths of light can be reduced compared to the case where the yarn that absorbs specific wavelengths of light is included in the other portions. Generally, yarn that absorbs specific wavelengths of light is more expensive than ordinary yarn. Therefore, since the amount of expensive yarn used can be reduced, manufacturing costs can be reduced.

[0017] In the seat belt webbing according to the fifth aspect of the present invention, the weft threads have the same absorption rate or reflectance of a specific wavelength of light as the other parts. As a result, the weft threads cannot be distinguished from the other parts by, for example, a detection device based on a specific wavelength of light. However, in the seat belt webbing according to the fifth aspect of the present invention, the density of the warp threads is higher than the density of the weft threads. As a result, the weft threads are more easily hidden by the warp threads, making it difficult for the weft threads to be exposed. In this way, it is possible to make it difficult for the weft threads, which cannot be distinguished by the detection device, to be exposed, and at least one of the first side line section, the second side line section, and the center line section can be easily detected by the detection device. [Brief explanation of the drawing]

[0018] [Figure 1] This is a schematic perspective view showing a seat belt webbing according to an embodiment of the present invention in a state in which an occupant is wearing it. [Figure 2] A schematic front view showing a webbing for a seat belt according to an embodiment of the present invention, showing a state imaged by an infrared camera. [Figure 3] A schematic diagram showing the state of warp and weft of a webbing for a seat belt according to an embodiment of the present invention. [Figure 4] A schematic front view showing a state in which a webbing for a seat belt according to an embodiment of the present invention is twisted.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments of a webbing for a seat belt according to the present invention will be described with reference to FIGS. 1 to 4. Each of the indicated arrows L indicates the longitudinal direction of the seat belt webbing 10, and the arrow W indicates the width direction of the seat belt webbing 10. The width direction is defined as the direction orthogonal to the longitudinal direction.

[0020] The seat belt webbing 10 (hereinafter simply referred to as "webbing" for short) according to the present embodiment is applied to, for example, a seat belt device 20 as an occupant protection device. As shown in FIG. 1, the seat belt device 20 is provided on a seat 30 on which an occupant (such as a driver) sits in a vehicle. In FIG. 1, the front in the vehicle front-rear direction is indicated by an arrow FR, the inner side in the vehicle width direction is indicated by an arrow IN, and the upper side in the vehicle up-down direction is indicated by an arrow UP. Further, in the present embodiment, as the seat 30, a driver's seat provided on the vehicle rear side of the steering wheel 25 among the front seats will be described as an example, but the seat 30 may be other seats such as a passenger seat or a rear seat.

[0021] As shown in FIG. 1, the seat 30 has a seat cushion 31 on which an occupant D sits and a seat back 32 attached to the vehicle rear side portion of the seat cushion 31. The seat 30 is directed forward in the vehicle front direction, and the body of the occupant D sitting on the seat 30 is directed forward in the vehicle front direction.

[0022] 〈Seat Belt Device〉 The seat belt device 20 is a three-point type. The seat belt device 20 includes a webbing 10 for restraining an occupant, which is formed in a long strip shape, a webbing winding device 21 capable of winding the webbing 10, and a buckle device (not shown). Details of the webbing 10 will be described later.

[0023] The webbing winding device 21 is fixed to the vehicle body at the lower end of a center pillar (not shown) on the outer side in the vehicle width direction of the seat 30. The webbing 10 is wound and stored in the webbing winding device 21 so as to be drawn out from the proximal end side, which is one end side in the longitudinal direction.

[0024] Above the webbing winding device 21, a slip joint 23 is arranged. The slip joint 23 is attached to the upper part of the center pillar (not shown). The webbing 10 drawn out from the webbing winding device 21 is wound around the slip joint 23 and folded back. Also, the tip of the webbing 10 folded back by the slip joint 23 is locked to an anchor plate 24. The anchor plate 24 is fixed to the vehicle body (for example, the frame of the seat 30) at the lower part of the center pillar.

[0025] The buckle device has a tongue through which the webbing 10 is slidably inserted, and a buckle fixed to the vehicle body (for example, the frame of the seat 30) and engaged with the tongue. The buckle is fixed to the vehicle body on the inner side in the vehicle width direction of the seat 30.

[0026] In the seat belt device 20, an occupant D sitting on the seat 30 grips the tongue, draws out the webbing 10 from the webbing winding device 21, and engages the tongue with the buckle, whereby the webbing 10 is worn on the occupant D. Further, the webbing winding device 21 biases the webbing 10 worn by the occupant D in the winding direction. Thereby, the slack of the webbing 10 is eliminated, so that the webbing 10 is brought into close contact with the body of the occupant D, and in an emergency of the vehicle or the like, the occupant D can be restrained by the webbing 10 to be protected.

[0027] When the webbing 10 is properly fitted to crew member D, the designated surface of the webbing 10 is positioned towards the front of crew member D, extending from the shoulder to the waist. In the following description, the surface that is positioned towards the front when properly fitted will be referred to as the front surface 10A. The surface opposite the front surface 10A will be referred to as the back surface 10D (see Figure 4).

[0028] <Webbing> Next, we will explain the details of webbing 10 with reference to Figures 1 to 3. As shown in Figures 1 and 2, the webbing 10 is formed in the shape of a long strip. As shown in Figure 2, the length L1 in the width direction of the webbing 10 is, for example, 46 mm. As shown in Figure 2, the webbing 10 includes a first side line portion 11 provided on one side in the width direction (left side of the paper in Figure 2), a second side line portion 12 provided on the other side in the width direction (right side of the paper in Figure 2), and a center line portion 13 provided between the first side line portion 11 and the second side line portion 12.

[0029] As shown in Figure 3, the webbing 10 has a plurality of warp threads 15 arranged along the longitudinal direction and a plurality of weft threads 16 arranged along the width direction. The webbing 10 is woven by the intersection of the plurality of warp threads 15 and the plurality of weft threads 16. In this embodiment, the webbing 10 is woven using a twill weave structure with the warp threads 15 and weft threads 16 as an example. However, the webbing 10 is not limited to the example of being woven using a twill weave structure; for example, it may be woven using a plain weave or satin weave structure. In Figure 3, for illustrative purposes, gaps are shown to be formed between adjacent warp threads 15 and weft threads 16, but in reality, the plurality of warp threads 15 and the plurality of weft threads 16 are closely arranged, and no gaps are formed between adjacent warp threads 15 and weft threads 16.

[0030] As shown in Figure 2, the first sideline portion 11, the second sideline portion 12, and the centerline portion 13 are provided on both sides of the webbing 10. That is, the first sideline portion 11, the second sideline portion 12, and the centerline portion 13 are provided on the front side 10A and the back side 10D of the webbing 10. The first sideline portion 11, the second sideline portion 12, and the centerline portion 13 are provided in the same positions on the front side 10A and the back side 10D of the webbing 10. Therefore, although Figure 2 illustrates the positions of the first sideline portion 11, the second sideline portion 12, and the centerline portion 13 on the front side 10A of the webbing 10, the first sideline portion 11, the second sideline portion 12, and the centerline portion 13 are also provided in the same positions on the back side 10D as shown in Figure 2.

[0031] The first side line portion 11 extends along the longitudinal direction. The first side line portion 11 is provided over substantially the entire longitudinal area of ​​the webbing 10. The first side line portion 11 is provided at a predetermined distance from one end 10B in the width direction of the webbing 10 (the left side of the paper in Figure 2). The distance L5 between the first side line portion 11 and one end 10B in the width direction of the webbing 10 is, for example, 3 mm. Also, the length L2 in the width direction of the first side line portion 11 is, for example, 3 mm.

[0032] The second side line portion 12 extends along the longitudinal direction. The second side line portion 12 is provided over substantially the entire longitudinal area of ​​the webbing 10. The second side line portion 12 is provided at a predetermined distance from the other end 10C in the width direction of the webbing 10 (the right side of the page in Figure 2). The distance L6 between the second side line portion 12 and the other end 10C in the width direction of the webbing 10 is, for example, 3 mm. Also, the length L3 in the width direction of the second side line portion 12 is, for example, 3 mm.

[0033] The first sideline section 11 and the second sideline section 12 are arranged to be symmetrical with respect to a center line C1 that passes through the center of the webbing 10 in the width direction. The center line C1 extends along the longitudinal direction.

[0034] The end 11A of the first side line section 11 on the side of the center line section 13 (right side of the page in Figure 2) is located closer to the one end 10B than the center line C2 that passes through the center between the end 13A of the center line section 13 on the side of the first side line section 11 (left side of the page in Figure 2) and the one end 10B in the width direction of the webbing 10.

[0035] The end 12A of the second side line section 12 on the side of the center line section 13 (left side of the paper in Figure 2) is located on the other end 10C side of the center line C3 that passes through the center between the end 13B of the center line section 13 on the side of the second side line section 12 (right side of the paper in Figure 2) and the other end 10C in the width direction of the webbing 10.

[0036] The center line section 13 extends along the longitudinal direction. The center line section 13 is provided over substantially the entire longitudinal area of ​​the webbing 10. The center line section 13 is spaced apart in the width direction from the first side line section 11 and the second side line section 12. The center line section 13 is located in the center of the webbing 10 in the width direction. In other words, the center line section 13 is provided so as to overlap with the center line C1. The center line section 13 is provided so as to be symmetrical with respect to the center line C1.

[0037] The first sideline section 11, the second sideline section 12, and the centerline section 13 are provided over substantially the entire longitudinal area of ​​the webbing 10. The first sideline section 11, the second sideline section 12, and the centerline section 13 each have different infrared absorption rates or infrared reflectance rates than the other parts (hereinafter referred to as "other parts"). Specifically, in this embodiment, the first sideline section 11, the second sideline section 12, and the centerline section 13 have higher infrared absorption rates than the other parts. That is, the first sideline section 11, the second sideline section 12, and the centerline section 13 have lower infrared reflectance rates than the other parts. Other parts include, for example, the portion between the first side line portion 11 and one end 10B in the width direction of the webbing 10, the portion between the first side line portion 11 and the center line portion 13, the portion between the center line portion 13 and the second side line portion 12, and the portion between the second side line portion 12 and the other end 10C in the width direction of the webbing 10. The combined area of ​​the first sideline section 11, the second sideline section 12, and the centerline section 13 is smaller than the area of ​​the other parts.

[0038] The warp threads 15 included in the first sideline section 11, the second sideline section 12, and the centerline section 13 are different from those included in the other sections. Specifically, the warp threads 15A included in the first sideline section 11, the second sideline section 12, and the centerline section 13 are warp threads 15 with a higher infrared absorption rate than the warp threads 15B included in the other sections. Specifically, the warp threads 15A included in the first sideline section 11, the second sideline section 12, and the centerline section 13 are, for example, black dope-dyed yarn. Because they contain warp threads 15A with a high infrared absorption rate, the first sideline section 11, the second sideline section 12, and the centerline section 13 have a higher infrared absorption rate than the other sections. The weft threads 16 included in the first sideline section 11, the second sideline section 12, and the centerline section 13 are the same as the weft threads 16 included in the other sections.

[0039] The first sideline section 11, the second sideline section 12, and the centerline section 13 are woven in the same manner as the other parts. Furthermore, the first sideline section 11, the second sideline section 12, and the centerline section 13 may be the same color as the other parts in visible light. That is, the first sideline section 11, the second sideline section 12, and the centerline section 13 and the other parts are distinguishable by their different colors in images captured by an imaging device 41 (see Figure 1) that uses infrared light for imaging. On the other hand, the first sideline section 11, the second sideline section 12, and the centerline section 13 and the other parts may be the same color and indistinguishable to the human eye.

[0040] Throughout the webbing 10, the density of the warp threads 15 is higher than the density of the weft threads 16. That is, the number of warp threads 15 per unit length is greater than the number of weft threads 16 per unit length. Specifically, for example, the number of warp threads 15 per unit length may be about seven times greater than the number of weft threads 16 per unit length. Note that the values ​​in the above explanation are examples and are not limited to these values.

[0041] <Seat belt detection device> The seat belt webbing 10 according to this embodiment can be applied to a seat belt detection device 40. The seat belt detection device 40 is a device that detects whether or not the occupant D, who is seated in the seat 30, is wearing the webbing 10.

[0042] The seat belt detection device 40 includes an imaging device 41 that images the occupant D from the front and above, and a control device 50 that detects whether or not the occupant D is wearing the webbing 10 based on the image captured by the imaging device 41.

[0043] The imaging device 41 has an infrared illumination function and a function to image the target. The imaging device 41 is positioned in front of and above the seat 30. The imaging device 41 illuminates the seat 30 with infrared light of a predetermined wavelength, which is invisible light, to illuminate the webbing 10 worn by the occupant D who is seated in the seat 30.

[0044] Furthermore, the imaging device 41 is equipped with an image sensor such as a CMOS sensor or a CCD sensor. The imaging device 41 is directed toward the seat 30 and captures infrared light reflected by the webbing 10 worn by the occupant D, who is seated in the seat 30.

[0045] The imaging device 41 is positioned above the vehicle's windshield glass (not shown) and mounted on the ceiling. The imaging device 41 only needs to be able to irradiate infrared light onto at least the upper body (for example, from the waist up) of the occupant D seated in the seat 30 and image the occupant D's upper body.

[0046] The control device 50 includes an imaging control unit 51 and a determination unit 52 as a determination means. The control device 50 also includes a microcomputer (not shown) connected to a bus, which includes a CPU, RAM, ROM, storage as non-volatile memory, and input / output interfaces. In the control device 50, the CPU reads programs stored in the ROM and storage, expands them into the RAM, and executes them, thereby realizing the functions of the imaging control unit 51 and the determination unit 52.

[0047] The imaging control unit 51 controls the imaging device 41 to take images in synchronization with the irradiation of infrared light. Specifically, the imaging control unit 51 controls the imaging device 41 to irradiate with infrared light and take images of the reflected infrared light.

[0048] The determination unit 52 determines whether or not the webbing 10 is attached to crew member D based on the information captured by the imaging device 41, and outputs the determination result. For example, the determination unit 52 may determine whether or not the webbing 10 is attached to crew member D by checking whether or not the first side line portion 11, the second side line portion 12, and the center line portion 13 are present on the front side of the portion spanning from the shoulder to the waist of crew member D in the image or video captured by the imaging device 41. Note that the method for determining whether or not the webbing 10 is attached to crew member D is just one example and is not limited to the method described above.

[0049] <Device for detecting the state of attachment> Furthermore, the seat belt webbing 10 according to this embodiment can be applied to the wearing state detection device 60. The wearing state detection device 60 detects the webbing 10 worn by occupant D seated in the seat 30, and detects the wearing state of the webbing 10 on occupant D.

[0050] The seatbelt detection device 60, like the seatbelt detection device 40, includes an imaging device 41 and a control device 50. The imaging control unit 51 of the imaging device 41 and the control device 50 are the same as those of the seatbelt detection device 40, so a detailed explanation is omitted.

[0051] The determination unit 52 determines the state in which the webbing 10 is attached to crew member D based on the information captured by the imaging device 41, and outputs the determination result. For example, as shown in Figure 4, if the first side line portion 11, the second side line portion 12, and the center line portion 13 detected in the image or video captured by the imaging device 41 are interrupted at an intermediate position in the longitudinal direction, the determination unit 52 may determine that the webbing 10 is attached in a twisted state. Note that the method for determining the state in which the webbing 10 is attached to crew member D is just one example and is not limited to the method described above.

[0052] <Mechanism of Action / Effect> According to this embodiment, the following effects and advantages are achieved. In this embodiment, the first sideline portion 11, the second sideline portion 12, and the centerline portion 13 each have different infrared absorption rates or infrared reflectances compared to the other portions. As a result, the webbing 10 has multiple regions with different infrared absorption rates or infrared reflectances. This makes it easier to detect the webbing 10, for example, if a detection device is provided that detects the webbing 10 based on infrared radiation.

[0053] Furthermore, since the webbing 10 can be easily detected, even when the imaging device 41 is installed on the upper side (above the seat 50 which is the target of imaging) and imaging is performed from above, the detection accuracy of the webbing 10 can be improved.

[0054] Furthermore, in this embodiment, the webbing 10 is provided with a first sideline portion 11, a second sideline portion 12, and a centerline portion 13 on both sides. This allows the webbing 10 to be detected from either side. Therefore, it is not necessary to manage the front and back sides of the webbing 10. Thus, the installation work of the webbing 10 can be simplified.

[0055] Furthermore, as shown in Figure 2, in this embodiment, the end 11A of the first side line portion 11 on the center line portion 13 side is located closer to the one end 10B than the center line C2 between the end 13A of the center line portion 13 on the first side line portion 11 side and the one end 10B in the width direction of the webbing 10. As a result, the distance between the first side line portion 11 and the center line portion 13 becomes relatively long, making it easier to distinguish between the first side line portion 11 and the center line portion 13. This makes it easier to detect the webbing 10, for example, when a detection device that detects the webbing 10 based on infrared light (e.g., a seat belt detection device 40 or an installation state detection device 60) is provided.

[0056] Furthermore, in this embodiment, the center line portion 13 is provided symmetrically with respect to the center line C1, and the first side line portion 11 and the second side line portion 12 are provided symmetrically with respect to the center line C1. In addition, the first side line portion 11, the second side line portion 12, and the center line portion 13 are provided in the same position on both sides. As a result, the arrangement pattern of the first side line portion, the second side line portion 12, and the center line portion 13 can be the same on both sides of the webbing 10. Therefore, it is not necessary to manage the front and back sides of the webbing 10. Thus, the installation work of the webbing 10 can be simplified.

[0057] In the portion containing infrared-absorbing threads, the infrared absorption rate or infrared reflectance differs from that of the portion without such threads because the infrared rays are absorbed by those threads. In this embodiment, the first sideline portion 11, the second sideline portion 12, and the centerline portion 13 contain warp threads 15A that have a higher infrared absorption rate than the other warp threads 15. Therefore, the infrared absorption rate or infrared reflectance can be made different between the first sideline portion 11, the second sideline portion 12, and the centerline portion 13 and the other portions.

[0058] Furthermore, in this embodiment, the area of ​​the first sideline section 11, the second sideline section 12, and the centerline section 13, which contain the warp threads 15A with high infrared absorption, is smaller than the area of ​​the other sections. This makes it possible to reduce the amount of warp threads 15A with high infrared absorption compared to cases where other sections contain them. Generally, threads with high infrared absorption are more expensive than ordinary threads. Therefore, since the amount of expensive thread used can be reduced, manufacturing costs can be reduced.

[0059] Furthermore, in this embodiment, the weft threads 16 have the same infrared absorption rate or infrared reflectivity as the other parts. As a result, the weft threads 16 cannot be distinguished from the other parts by infrared-based detection devices (such as the seat belt detection device 40 or the wearing state detection device 60). However, in this embodiment, the density of the warp threads 15 is higher than the density of the weft threads 16. As a result, the weft threads 16 are more easily obscured by the warp threads 15, making it difficult for the weft threads 16 to be exposed. In this way, the weft threads 16, which cannot be distinguished by the detection device, can be made difficult to expose, making it easier for the detection device to detect at least one of the first side line section 11, the second side line section 12, and the center line section 13.

[0060] Furthermore, if the first side line portion 11, etc., is provided at the widthwise end 10B of the webbing 10, etc., it may be impossible to distinguish the side line portion from the clothing of the crew member D. In particular, when the imaging device 41 images the target from above, the possibility of being unable to distinguish the side line portion from the clothing of the crew member D increases. On the other hand, in this embodiment, the first side line portion 11 is provided spaced apart from the widthwise end 10B of the webbing 10. Also, the second side line portion 12 is provided spaced apart from the widthwise end 10C of the webbing 10. Therefore, the first side line portion 11 and the second side line portion 12 can be easily detected. Thus, even when the imaging device 41 images the target from above, the first side line portion 11 and the second side line portion 12 can be suitably detected.

[0061] Furthermore, as shown in region A of Figure 3, in the portion where the warp threads 15 are located on the front surface 10A side (front side of the paper) more than the weft threads 16, the warp threads 15 are positioned on the front surface 10A. On the other hand, as shown in region B, in the portion where the warp threads 15 are located on the back surface 10D side (back side of the paper) more than the weft threads 16, the warp threads 15 are positioned on the back surface 10D. In this way, each warp thread 15 is exposed on both the front surface 10A and the back surface 10D. In this embodiment, by using dope-dyed yarn for the warp threads 15A included in the first sideline portion 11, the second sideline portion 12, and the centerline portion 13, the first sideline portion 11, the second sideline portion 12, and the centerline portion 13, which have a high infrared absorption rate, are formed. Therefore, the first sideline portion 11, the second sideline portion 12, and the centerline portion 13, which extend in the longitudinal direction, can be easily provided at the same positions on both sides.

[0062] Although the webbing for seat belts according to the embodiment has been described above, the present invention can be modified as appropriate without departing from its spirit.

[0063] For example, in the above embodiment, an example was described in which the infrared reflectance or absorptive rate of the first side line portion 11, the second side line portion 12, and the center line portion 13 is different from the infrared reflectance or absorptive rate of the other portions, but the present invention is not limited thereto. For example, the reflectance or absorptive rate of specific wavelengths of light other than infrared (e.g., ultraviolet light or visible light) in the first side line portion 11, the second side line portion 12, and the center line portion 13 may be different from that of the other portions.

[0064] Furthermore, the widthwise length L1 of the webbing 10, the widthwise length L2 of the first sideline portion 11, the widthwise length L3 of the second sideline portion 12, the widthwise length L4 of the centerline portion 13, the distance L5 between the first sideline portion 11 and one end 10B of the webbing 10 in the widthwise direction, and the distance L6 between the second sideline portion 12 and the other end 10C of the webbing 10 in the widthwise direction are not limited to the lengths described above. Each length and distance can be appropriately set based on the shape and usage of the webbing 10. [Explanation of Symbols]

[0065] 10...Webbing (webbing for seat belts), 11...First sideline section, 12...Second sideline section, 13...Centerline section, 15...Warp threads, 16...Weft threads

Claims

1. A seat belt webbing formed in a long strip shape, woven by interlacing multiple warp threads arranged along the longitudinal direction and multiple weft threads arranged along the width direction which is perpendicular to the longitudinal direction, A first side line portion extends in the longitudinal direction and is provided on one side in the width direction, A second side line portion extends in the longitudinal direction and is provided on the other side in the width direction, It extends in the longitudinal direction and includes a center line portion provided between the first side line portion and the second side line portion, The first side line portion, the second side line portion, and the center line portion each have a different absorption rate or reflectance of a specific wavelength of light compared to the other portions, which are the parts other than the first side line portion, the second side line portion, and the center line portion. The first side line portion, the second side line portion, and the center line portion are seat belt webbings provided on both sides.

2. The first side line portion and the center line portion are spaced apart in the width direction. The seat belt webbing according to claim 1, wherein the end of the first side line portion on the center line portion side is located closer to the one end than the center between the end of the center line portion on the first side line portion side and the one end of the seat belt webbing in the width direction.

3. The aforementioned center line portion is provided so as to overlap with the center line extending in the longitudinal direction at the center in the width direction, and is provided so as to be symmetrical with respect to the center line. The first side line portion and the second side line portion are provided so as to be symmetrical with respect to the center line, The seat belt webbing according to claim 1, wherein the first side line portion, the second side line portion, and the center line portion are provided so as to be in the same position on both sides.

4. The combined area of ​​the first side line portion, the second side line portion, and the center line portion is smaller than the area of ​​the other portions. The seat belt webbing according to claim 1, wherein the first side line portion, the second side line portion, and the center line portion each contain a thread that absorbs light of a specific wavelength, so that the absorption rate or reflectance of light of a specific wavelength differs from that of the other portions.

5. The seat belt webbing according to claim 1, wherein at least one of the first side line portion, the second side line portion, and the center line portion has a plurality of warp threads having a different absorption rate or reflectance of a specific wavelength of light from the other portion, and a plurality of weft threads having the same absorption rate or reflectance of a specific wavelength of light as the other portion, and the density of the plurality of warp threads is higher than the density of the plurality of weft threads.

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