JP2010243240A - Body pressure distribution measuring device for three-dimensional knitted fabric - Google Patents

Abstract

An object of the present invention is to apply the cushioning property of a three-dimensional knitted fabric composed of an upper knitted fabric and a lower knitted fabric and a connecting yarn that keeps both at a predetermined interval, and by deforming the shape of the three-dimensional knitted fabric according to the human body load. An object of the present invention is to obtain a body pressure distribution measuring device for a three-dimensional knitted fabric that can measure a body pressure distribution of a seated person in a seat by measuring a change in capacitance at each measurement point and converting it to body pressure. And
SOLUTION: The present inventors have arranged capacitance measuring points having a constant area corresponding to an upper knitted fabric and a lower knitted fabric on the upper knitted fabric and the lower knitted fabric, and at each capacitance measuring point, It was found that a device for measuring body pressure distribution of a three-dimensional knitted fabric can be obtained by measuring the capacitance of the three-dimensional knitted fabric and converting the capacitance into body pressure.
[Selection] Figure 1

Description

  The present invention relates to measuring a posture of a seated person in a vehicle seat or the like as a body pressure distribution, and relates to a cushion of a three-dimensional knitted fabric comprising an upper knitted fabric, a lower knitted fabric, and a connecting yarn that keeps both at a predetermined interval. The body pressure distribution of the seated person in the seat is measured by measuring the change in capacitance at each measurement point caused by the deformation of the shape of the three-dimensional knitted fabric according to the human body load, and converting it into body pressure The present invention relates to a body pressure distribution measuring device for a three-dimensional knitted fabric that can measure the knitting.

  Various devices for measuring body pressure distribution have been disclosed. In Patent Document 1, a sensor mat in which pressure-sensitive sensors are arranged at equal intervals in the vertical and horizontal directions is arranged on the seating surface of the seat, A method is described in which the static deflection characteristics of each pressure-sensitive sensor are measured, and the body pressure distribution under the sitting of the examinee is measured as the pressure value of each pressure-sensitive sensor.

  In Patent Document 2, when a multi-layer structure is provided with conductive yarns on both surfaces of a top surface and a bottom surface of a fiber structure and the multi-layer structure sheet is pressed, the top surface and the bottom surface of the multi-layer structure are spaced at a constant interval. The connecting portion to be maintained is compressed, the conductive yarns arranged on the upper surface portion and the lower surface portion come into contact, the electrical resistance between the conductive yarns at this time changes, and by detecting this electrical resistance change, The pressure can be detected.

However, in Patent Document 1, the wiring of the pressure-sensitive sensor is complicated, and the user feels uncomfortable when sitting and is not comfortable. Further, in Patent Document 2, since the electrical resistance is changed by contacting the conductive yarns arranged on the upper surface portion and the lower surface portion, the pressure distribution and the change with time of the portion exceeding a certain pressure value are detected. Although it is possible, the structure cannot detect the amount of change in the pressure value.
JP-A-11-248409 JP 2006-284276 A

  Applying the cushioning properties of a three-dimensional knitted fabric composed of upper and lower knitted fabrics and connecting yarns that keep them at a predetermined interval, the static knitting at each measurement point caused by the deformation of the three-dimensional knitted fabric according to the human body load is applied. An object is to obtain a body pressure distribution measuring device for a three-dimensional knitted fabric that can measure a body pressure distribution of a seated person in a seat by measuring a change in electric capacity and converting it into body pressure.

  The present invention has been made in view of such a technical background, and provides the following means in order to achieve the object.

[1] A body pressure distribution measuring apparatus for a three-dimensional knitted fabric comprising an upper knitted fabric and a lower knitted fabric, and a connecting yarn that keeps both at a predetermined interval, and has a constant area corresponding to the upper knitted fabric and the lower knitted fabric. An electrostatic capacity measuring point is arranged on the upper knitted fabric and the lower knitted fabric, and the electrostatic capacity measuring device for measuring the electrostatic capacity at each of the electrostatic capacity measuring points is provided. A body pressure distribution measuring device for a three-dimensional knitted fabric, comprising a body pressure converting device that converts pressure into pressure.

[2] The three-dimensional knitted fabric according to item 1 above, wherein an area of the capacitance measuring point having the constant area is 1 to 20 cm ² and an interval between the upper knitted fabric and the lower knitted fabric is 5 to 20 mm. Body pressure distribution measuring device.

[3] The body pressure distribution measuring device for a three-dimensional knitted fabric according to the item 1 or 2, wherein the capacitance measuring point having a certain area is a braided conductive yarn.

In the invention of [1], since it is a body pressure distribution measuring device for a three-dimensional knitted fabric composed of an upper knitted fabric and a lower knitted fabric and a connecting yarn that keeps both at a predetermined interval, it has a cushioning property when seated and feels uncomfortable. The capacitance measurement points having a certain area corresponding to the upper knitted fabric and the lower knitted fabric are arranged on the upper knitted fabric and the lower knitted fabric. A certain amount of charge can be stored between the ground and the lower knitted fabric. In addition, since it has a capacitance measuring device that measures the capacitance at each capacitance measurement point, and has a body pressure conversion device that converts the measured capacitance into body pressure, The three-dimensional knitted fabric is deformed according to the body pressure of the human body when seated, and the capacitance at the measurement point changes according to the deformation, so the change in capacitance can be measured, and the change in capacitance further Can be converted as a change in body pressure and measured as a body pressure distribution. In addition, if wiring between the capacitance measurement point and the capacitance measuring device that measures the capacitance using the space between the upper knitted fabric and the lower knitted fabric of the three-dimensional knitted fabric, the upper knitted fabric or Since the wiring is not exposed on the surface of the lower knitted fabric, it is possible to provide a body pressure distribution measuring device that has a beautiful appearance, does not feel uncomfortable when seated, and has a comfortable seating comfort.

In the invention of [2], the capacitance measurement point having the constant area is 1 to 20 cm ² and the distance between the upper knitted fabric and the lower knitted fabric is 5 to 20 mm. It can be done reliably.

In the invention of [3], the capacitance measuring point having a certain area is an electrode having a certain area by weaving a conductive yarn, and has a sense of unity with the knitted fabric rather than the one having the electrode attached thereto, It is easy to handle and does not feel uncomfortable when seated. Moreover, it can be set as the body pressure distribution measuring apparatus provided with the cushioning property which has the outstanding property which a solid knitted fabric has, air permeability, and a softness | flexibility.

  The present invention is an apparatus for measuring body pressure distribution of a three-dimensional knitted fabric comprising an upper knitted fabric 2 and a lower knitted fabric 3 and a connecting yarn 5 that keeps both at a predetermined interval. For example, as shown in FIG. Capacitance measurement points having a constant area are arranged on one upper knitted fabric 2 and lower knitted fabric 3. A capacitance measuring point 4-1 is arranged on the upper knitted fabric side, and a capacitance measuring point 4-2 is arranged on the lower knitted fabric side. The material of the capacitance measuring point having a certain area is electrically conductive and is not particularly limited as long as it can accumulate electric charge. However, it is a good idea to place a conductive yarn in a three-dimensional knitted fabric. Is preferable because it is soft and has the same texture as the surface of the three-dimensional knitted fabric, and the seated person sits without being aware of the measurement point.

The area of the capacitance measurement point having the constant area is preferably 1 to ²⁰ cm ² depending on the area of the seated portion and the number of capacitance measurement points. If the area exceeds 20 cm ² , a large number of measurement points cannot be obtained and the body pressure distribution cannot be measured accurately. An area smaller than 1 cm ² is not preferable because the change in capacitance is small and accurate measurement cannot be performed. Further, as the number of capacitance measurement points, it is preferable that 200 to 800 pieces are equally arranged in 1 m ² from the size of the human body.

  In the upper knitted fabric and the lower knitted fabric, the yarn that occupies the area other than the capacitance measurement point is not particularly limited as long as it is a non-conductive yarn, but a multifilament yarn such as 400 to 800 dtex nylon is preferable. . If it is a multifilament yarn such as nylon of 500 to 700 dtex, the texture is soft and the durability is excellent.

  The capacitance measurement point 4-1 on the upper knitted fabric side and the capacitance measurement point 4-2 on the lower knitted fabric side are connected to the capacitance measurement device 7 via a separately prepared conductive yarn or lead wire 6. Then, the capacitance is measured. The capacitance measuring device 7 is prepared according to the number of capacitance measuring points. If the wiring at this time is performed using the space of the three-dimensional knitted fabric (the space with the connecting yarn between the upper knitted fabric and the lower knitted fabric), the wiring is not exposed on the surface of the upper knitted fabric or the lower knitted fabric, A body pressure distribution measuring device having a beautiful appearance and a comfortable seating can be obtained.

  The distance between the upper knitted fabric and the lower knitted fabric is preferably 5 to 20 mm. When the distance is less than 5 mm, there is little change in the capacitance, making it difficult to wire using the space of the three-dimensional knitted fabric, and the capacitance can be measured by contacting the upper knitted fabric and the lower knitted fabric with a load. Disappear. Moreover, if the interval is widened beyond 20 mm, the shape of the three-dimensional knitted fabric is unstable and it becomes difficult to measure the capacitance. The connecting yarn that keeps the upper knitted fabric and the lower knitted fabric at a predetermined interval is not particularly limited as long as it is a non-conductive yarn, and is not particularly limited, but has good cushioning properties and durability, such as 400 to 800 dtex nylon. Monofilament yarn is preferred.

  It is not necessary to prepare a special device as the capacitance measuring device 7, and a commercially available device may be used. The body pressure conversion device 8 displays the capacitance measured by the capacitance measuring device by converting it into body pressure. When body pressure is applied, the three-dimensional knitted fabric is deformed, and the capacitance at the capacitance measuring point is changed. Change and convert this change into a change in pressure.

  Next, examples of the present invention will be described, but the scope of the present invention is not limited to these examples.

<Example 1>
As shown in FIG. 1, a three-dimensional knitted fabric in which capacitance measurement points having an area of 30 × 30 mm are arranged equally (400 pieces / m ² ) corresponding to the upper knitted fabric and the lower knitted fabric is created. did. In addition, as a yarn for knitting the capacitance measurement point, a nylon multifilament conductive yarn of 110 dtex / 24f / 6 (manufactured by Nippon Kashiwa Dyeing Co., Ltd., volume resistance value 3.0 × 10 ² Ω · cm) is used after knitting. Cut the yarn end of the conductive yarn at each capacitance measurement point, connect the lead wire passing between the upper knitted fabric and lower knitted fabric and each yarn end, and connect the other end to each capacitance measuring device Then, the capacitance at each capacitance measurement point was measured. Furthermore, each measured electrostatic capacity was converted into body pressure by a body pressure conversion device that converts body pressure into body pressure, and body pressure distribution was measured. The knitting machine used at this time was a double raschel knitting machine (9 gauge / 2.54 cm distance between hooks 15 mm), and the yarn used for the base of the upper knitted fabric and the lower knitted fabric was 660 dtex / 96 f polyester. A multifilament yarn was used, the structure was double tricot, the connection yarn was a polyester monofilament yarn of 660 dtex / 1f, and the finished thickness was 13.5 mm.

  It should be noted that the variation in capacitance at each capacitance measurement point was corrected to be a body pressure distribution measurement value when converted into body pressure. Placed on the seat of an automobile and measured body pressure distribution, but the wiring is not exposed on the surface of the upper knitted fabric or lower knitted fabric. It was tolerable.

<Example 2>
In Example 1, the capacitance measurement points having an area of 30 × 30 mm are arranged uniformly on the upper knitted fabric side, and the capacitance measurement points are not knitted with conductive yarn on the lower knitted fabric side. A body pressure distribution measuring device was obtained in the same manner as in Example 1 except that the conductive polymer was printed by inkjet and used as a capacitance measuring point. The body pressure distribution was measured by placing it on a car seat, but it had a good appearance as in Example 1 and could withstand practical use.

<Comparative Example 1>
In Example 1, a body pressure distribution measuring apparatus was obtained in the same manner as in Example 1 except that the double raschel knitting machine was knitted using a knitting machine having a distance between hooks of 5 mm and the finished thickness was 3.5 mm. When the body pressure distribution was measured, the upper knitted fabric and the lower knitted fabric were in contact with each other, the capacitance was not measured, and it was only possible to determine whether a person was seated.

It is the schematic which concerns on Example 1 of this invention.

Claims (3)

  A body pressure distribution measuring device for a three-dimensional knitted fabric composed of an upper knitted fabric and a lower knitted fabric and a connecting yarn that keeps both at a predetermined interval, and having a constant area corresponding to the upper knitted fabric and the lower knitted fabric. A point is arranged on the upper knitted fabric and the lower knitted fabric, and it has a capacitance measuring device that measures the capacitance at each capacitance measuring point, and converts each measured capacitance into body pressure. A body pressure distribution measuring device for a three-dimensional knitted fabric characterized by having a body pressure converting device. Said constant area in the capacitance area of the measurement points 1 to 20 cm ² with a body of three-dimensional knit fabric according to claim 1, the interval between the upper knitted fabric and the lower knitted fabric characterized in that it is a 5~20mm Pressure distribution measuring device.   The body pressure distribution measuring device for a three-dimensional knitted fabric according to claim 1 or 2, wherein the capacitance measuring point having a certain area is a braided conductive yarn.

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