JPH0617836B2 - Detector for pressure distribution measurement - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pressure distribution measuring detector, and more particularly to a detector suitable for detecting a surface pressure distribution by arranging a plurality of pressure sensitive sensors on a planar body. It is a thing.

(b) Prior Art In general, when a human being actually uses equipment such as a seat, a mat, and a bed, it is necessary to measure the position and the pressure to which the equipment surface is applied. This is extremely important when designing as the best ergonomics or when performing fatigue analysis of the human body.

Conventionally, as a means for detecting such a pressure distribution, for example, a large number of pressure-sensitive sensors are regularly arranged on a flat rigid plate, and when a person sits or sleeps on these pressure-sensitive sensors. It is known that the pressure distribution is measured from the output of each pressure-sensitive sensor. However, since such a rigid plate is not deformed like the deformation of the seat or the like during actual use, it is impossible to obtain an accurate pressure distribution. On the other hand, in order to solve such problems,
As a devised device, a "pressure distribution detector" is proposed in Japanese Utility Model Publication No. 55-12553. That is, the pressure distribution detection body disclosed in this publication forms a planar body by weaving a plurality of flexible wiring bodies and another flexible wiring body or a flexible base material. A pressure sensor is attached to the sheet by adhesion, and the output from the sensor is taken out via the wiring body so that the pressure distribution generated in the sheet can be detected.

However, in the case of such a configuration, since the connection portion between the pressure sensor and the wiring body is connected on the terminal by the conductive adhesive property or solder, etc. When weaving a body or a base material, bending force or tensile force is repeatedly applied to this connection portion, which causes disconnection or contact failure, which easily causes failure or noise.

In addition, it is customary to form a protective coating on such connecting portions and other wiring body portions by a coating after attaching the pressure-sensitive sensor to prevent moisture, but the coating operation is very troublesome. Moreover, it was difficult to completely perform moisture-proof treatment. Furthermore, if one sensor fails, it is very difficult to replace it.

(c) Object The present invention has been made in view of the above-mentioned problems, and an object of the present invention is that there is no fear of a failure due to disconnection, there is little discomfort of a human body at the time of measurement, a feeling of foreign matter, and a pressure distribution. Can be accurately detected with high sensitivity, and in addition, when measuring the pressure distribution in the measurement area, the degree of freedom in the arrangement of the detectors is high, and it is possible to form an arbitrary array pattern. If one of the detectors fails, the detector part can be easily and quickly replaced with a non-defective detector, and a detector for pressure distribution measurement that facilitates measurement work is provided.

(d) Configuration In order to achieve the above object, the present invention is a pressure-sensitive sensor that receives pressure and converts the pressure into an electric signal, and has a disk-shaped overall shape, and a peripheral portion thereof extends outwardly. An inclined portion is formed so as to be gradually thinned, a cord connecting portion formed of a through hole is formed at a plurality of positions of the inclined portion, and the pressure sensor is integrally formed with the pressure receiving surface side slightly protruding. Alternatively, a rigid casing integrally fixed to the casing and fixedly held inside the casing or in the concave portion,
A state in which a piano wire is inserted together with a lead wire inside and a terminal plate to which a signal line derived from the pressure sensor is connected, and one end side is inserted inside the casing from the outside through an introduction hole of the casing. And a cable in which the lead wire and the piano wire are connected to the terminal plate, and a plurality of the casings are arranged at predetermined intervals, and the rope connecting portions of the casings adjacent to each other are connected by a rope. Thus, a net-like body sufficient to cover a predetermined measurement area is knitted, and the pressure distribution in the measurement area can be measured.

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

FIG. 1 is a plan view showing the structure of a pressure distribution measuring detector which is an embodiment of the present invention.

In the figure, 1 is a pressure sensitive sensor which receives pressure from the pressure receiving surface 1a and converts this pressure into an electric signal. In this pressure-sensitive sensor 1, for example, four strain gauges forming a Wheatstone bridge are attached to the back surface side of a pressure receiving plate by adhesion or other means such as a diaphragm elastically deformed by receiving pressure. The displacement of the pressure receiving plate due to is detected as the resistance value change of the strain gauge. Reference numeral 2 is a gauge lead which is an input / output signal line for an electric signal of the strain gauge. Reference numeral 3 denotes a casing which has a disk shape and which holds and holds the pressure-sensitive sensor 1. The central portion of the upper surface 3a of the casing 3 has a diameter slightly larger than that of the pressure-sensitive sensor 1. A concave portion (or concave portion) 4 is formed that is slightly shallower than the thickness. The pressure sensor 1 is fitted and fixed in the concave portion 4 with the pressure receiving surface 1a thereof slightly protruding. The concave portion 4 further has a cutout portion 4a which is cut out in a substantially semi-circular shape toward the peripheral edge portion of the casing 3, and the pressure sensitive sensor faces the lower surface 3b side of the casing 3 from the cutout portion 4a. An insertion hole 5 for inserting the gauge lead 2 of No. 1 is formed. Also, the casing 3 has
An introduction hole 6 for introducing a lead wire is formed so as to penetrate from the inner wall of the cutout portion 4a to the side periphery of the casing 3. A thin tube 7 is fitted into the introduction hole 6 from below the casing 3, and a cable 9 having a plurality of lead wires 8 covered with an insulator is inserted into the thin tube 7. Upper surface 3a and lower surface 3 of casing 3
The peripheral portion of b is formed with inclined portions 3c and 3d which are inclined so as to be gradually thinned outward. The inclined portions 3c and 3d are penetrated from one side of the casing 3, for example, from the upper surface 3a side to the other surface side (lower surface 3b side) at four locations that are substantially symmetrical with respect to the center of the casing 3. Cable connecting holes 10a to 10d, which are cable connecting portions for connecting 3 through a connecting member such as a cable, are formed.

FIG. 2 is a sectional view taken along the line AA of FIG.

In the figure, a concave portion (or concave portion) 11 having a slightly larger diameter than the concave portion 4 formed on the upper surface 3a side is formed in the central portion of the casing 3 on the lower surface 3b side. The partition 12 having high rigidity is left between the concave portion 11 and the concave portion 11. Reference numeral 13 is a substantially circular printed board attached to the surface of the partition 12 in the concave portion 11 by means such as adhesion or screwing. On this printed circuit board 13,
As shown in the bottom view of FIG. 3, conductive patterns 14a to 14e made of copper foil are formed at five locations. And
On these conductive patterns 14a to 14e, the gauge lead 2a and the lead wire 8a, the gauge lead 2b and the lead wire 8b, the gauge lead 2c and the lead wire 8c, and the gauge lead 2d and the lead wire 8d are respectively connected by soldering or the like. Further, on the conductive pattern 14e, the cable reinforcing piano wire 8e inserted into the cable 9 together with the lead wires 8a to 8d is fixed by soldering or the like.

Next, a procedure for assembling the detector having the above configuration will be described.

First, a thin tube 7 made of, for example, phosphor bronze is fitted into the introduction hole 6 of the casing 3. Then, the printed board 13 is adhered and fixed onto the surface of the partition 12 on the lower surface 3b side of the casing 3 using an adhesive. The printed circuit board 13 is made of, for example, glass epoxy, on which conductive patterns 14a to 14e of copper foil are formed by photolithography or the like.

After the adhesive of the printed circuit board 13 is heated and hardened in, for example, a constant temperature bath, the cable 9 is inserted into the thin-walled tube 7, and the lead wires 8a to 8d and the piano wire 8e are connected to the conductive patterns 14a to 14e on the printed circuit board 13. Solder to (3rd
Figure). Here, for soldering, for example, the piano wire 8e →
It is preferable to carry out in the order of lead wires 8b, 8c → lead wires 8a, 8d.

The pressure-sensitive sensor 1 is bonded and fixed to the surface of the partition 12 on the upper surface 3a side of the casing 3 with an adhesive so that the pressure-receiving surface 1a of the pressure-sensitive sensor 1 faces upward. At this time, the gauge leads 2 (2a to 2d) as the signal lines of the pressure sensitive sensor 1 are
It is led out to the lower surface 3b side of the casing 3 through the insertion hole 5 (state of FIG. 2).

After the adhesive of the pressure-sensitive sensor 1 is left at room temperature or dried or heat-cured in a constant temperature bath, the gauge leads 2a to 2d are attached to the respective predetermined conductive patterns 14a to 14 on the printed circuit board 13.
Solder to d (state in Fig. 3).

Insulation check (eg casing 3 and lead wire 8
a) to 8d) and confirming that the insulation resistance is equal to or higher than a predetermined value, the cutout portion 4a of the concave portion 4 and the concave portion 1
1 is filled with an adhesive such as an epoxy resin and dried and cured.
At this time, the adhesive or the like is applied to the concave portions 4 and 11 of the casing 3.
It should be prevented from squeezing out further and its surface should be smooth and free of irregularities.

FIG. 4 shows an example of a net-like body formed by connecting the detectors constructed and assembled as described above via ropes.

In the figure, reference numeral 15 is a detector shown in FIGS. 1 to 3, and 16 is a cord connecting the detectors 15, for example, carbon fiber is used (in the present embodiment, manufactured by DuPont). I'm using Kevlar # 8, but it could be something else that will serve the purpose). The rope 16 connects the detectors 15 to each other by connecting the ends to the rope connecting holes 10a to 10d formed in the casing 3 of the detector 15. Further, the cables 9 from the detector 15 are grouped into several sets and are led out in the left-right direction or the up-down direction in FIG. In the case of the net-like body, the detectors 15 are arranged in a diamond shape (parallelogram) in the illustrated case, and the adjacent detectors 15 are connected by ropes.

The net-like body formed by the detector 15 and the rope 16 formed in this way is arranged (extended) in a pressure receiving portion such as a seat as a measurement target.

Incidentally, at the time of actual measurement, a double-sided tape or the like is attached to the back surface of the detector 15 to prevent the deviation from the seat seat material. At the time of this measurement, a bridge voltage from a bridge power supply (not shown) is supplied via a lead wire 8 to a predetermined two of the gauge leads 2a to 2d of the pressure-sensitive sensor 1 of each detector 15. Then, when pressure is applied to the pressure receiving surface 1a of the pressure sensitive sensor 1, the resistance value of a strain gauge (not shown) attached to the back surface side of the pressure receiving surface 1a changes due to this pressure, and an electric signal corresponding to the change (Generally, a voltage signal) is output via the other two gauge leads 2, the printed board 13 and the lead wire 8. This output is for each detector 1
Processed every 5 and pressure distribution is measured. For measurement,
There are two types, static characteristic measurement and dynamic characteristic measurement. In the static characteristic measurement, the pressure distribution of each part of the net-like body when a person sits down or sleeps in a certain posture is determined based on the output of each detector 15, and is shown as an isobaric distribution curve and isobaric distribution three-dimensional diagram. Etc. are displayed on a graphic display, digital plotter, printer, etc. in the form of figures, numerical tables, etc. In the dynamic characteristic measurement, a load is applied to the net-like body to give vibration, and the vibration waveform of each detector 15 on the net-like body is amplified by, for example, an amplifier, and a high-speed scanner and a high-speed A / D converter are used. Then, the minicomputer performs various statistical analyzes and outputs the analysis results to an output device such as a graphic display to display the measurement results.

As described above, according to the present embodiment, on the printed circuit board 13 in which the gauge lead 2 which is a signal line controlling the input / output of the pressure sensitive sensor 1 and the lead wire 8 connected to the external measurement system are fixed to the casing 3. For example, the cable 9
Even if a pulling force is applied to the gauge lead 2 or the position of each detector 15 is displaced by an external force, no pulling force is applied to the gauge lead 2, so that the gauge lead 2 may be peeled off from the printed circuit board 13 or broken. There is no. Further, the piano wire 8e inserted into the cable 9 together with the lead wire 8 is the printed circuit board 13 of the casing 3 (more specifically, the conductive pattern 1).
4e), the situation in which the cable 9 extends or the lead wire 8 breaks even if an external force is applied to the cable 9 is completely prevented.

Further, in each detector 15, since the rope 16 is connected to the rope connecting holes 10a to 10d formed in the casing 3 to form a net-like body as shown in FIG. 4, the shape of the net-like body is formed. The arrangement method of the detectors 15 has a high degree of freedom, and it is possible to form an arbitrary array pattern by changing the length of the ropes 16, for example.

Further, since each detector 15 is connected only by the rope 16, for example, when one detector 15 fails,
It is possible to easily and quickly replace the non-defective detector by cutting only the rope 16 in that portion.

Further, since the peripheral portions 3c and 3d of the casing 3 are formed so as to be inclined and become gradually thinner toward the peripheral portion from the pressure receiving surface 1a of the pressure-sensitive sensor 1, the detector 15
The clothing of the human body in contact with or the cloth or the like covering the detector 15 is easily adapted to the detector 15, and a pressure detection error may occur due to the pressing force of the object to be measured being supported by the peripheral portion of the casing 3. Since the pressure is reduced and the pressure is evenly applied to the pressure receiving surface 1a of the pressure sensitive sensor 1, the sensitivity of the pressure sensitive sensor 1 is increased and the pressure distribution can be measured more accurately.

Further, when the human body is on these detectors 15, the corners of the casing 3 and the like do not cause discomfort or a feeling of foreign matter.

Further, since the detector 15 has the gauge lead 2 of the pressure-sensitive sensor 1 and the printed circuit board 13 which is a connecting portion between the gauge lead 2 and the lead wire 8 completely sealed with an adhesive or the like, the moisture-proof treatment is performed. Even under various usage conditions, the risk of failure due to a decrease in insulation resistance is extremely low.

Furthermore, according to the present embodiment, a very thin net-like body can be knitted and the weight is extremely light, so that the measurement work is extremely facilitated.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, the rope connecting holes 10a to 10 formed in the casing 3
The number of d is not limited to 4 but can be knitted in a net shape if 3 or more, and if 6 or more are provided,
The measures 10a to 10d can be connected in the form of a triangular matrix, in which case the position of each detector 15 in the net can be maintained more correctly.

In addition, when assembled in a rhombus shape as shown in Fig. 4, the shape may change when a force is applied to the left and right. In that case, connect one of the diagonal lines of the rhombus with a reinforcing cord. This makes it possible to prevent the shape from changing.

Further, in the above-described embodiment, the pressure sensor 1 and the casing 3 are separately configured, but the main body of the pressure sensor 1 is attached with the flange-shaped portion having the cord connecting portion and the printed circuit board 13. The recess may be integrally formed.

Further, in the above-mentioned embodiment, the description has been given of the example in which the carbon fiber or the like is used as the rope 16, but a wire such as a piano wire may be used.

Furthermore, the assembling means of the detector 15 is not limited to the above-described order, but the order can be changed appropriately.

(e) Effects As will be apparent from the above-described detailed description, according to the present invention, it is possible to provide a pressure distribution measuring detector that exhibits the following various effects.

First, since the signal line that controls the input and output of the pressure sensor and the lead wire that is connected to the external measurement system are connected on the terminal plate fixed to the casing, tensile force may be applied to the cable. Even if the position of each detector is displaced by an external force, no tensile force is applied to the signal line derived from the pressure-sensitive sensor.Therefore, the signal line may be peeled off from the terminal board or disconnected. Absent.

Secondly, since the piano wire inserted into the cable together with the lead wire is connected to the terminal plate fixed to the casing, the cable may be extended or broken even if an external force is applied to the cable. Can be completely prevented.

Thirdly, since each detector (pressure-sensitive sensor) forms a net-like body by a rope connected to a through hole formed in a peripheral portion of the casing, the detector can be arranged in a flexible manner. It is possible to form an arbitrary array pattern by simply changing the length of the rope, and if one of the multiple detectors fails, cut only that portion of the rope. It can be easily and quickly replaced with a non-defective detector, and since the net-like body is knitted only by the detector and the rope, the net-like body is thin and lightweight, which makes measurement work easy. It has the advantage of being extremely easy.

Fourthly, since the inclined portion is provided in the peripheral portion of the casing so that the thickness gradually becomes thinner from the pressure receiving surface of the pressure-sensitive sensor toward the peripheral portion, the human body clothing contacting the detector or the detector is It is easy for the cloth that covers
Therefore, when the human body is on the detector, the corners of the casing do not cause discomfort or foreign matter.

Fifthly, a pressure detection error caused by supporting the pressing force of the object to be measured by the peripheral portion of the casing is less likely to occur, and the sloped portion is formed on the peripheral portion of the casing, and the voltage sensor has a pressure receiving surface. The pressure is evenly applied to the pressure-receiving surface of the pressure-sensitive sensor in combination with the structure in which the side is slightly projected so that it is integrally formed with or integrally fixed to the casing. The sensitivity of is improved, and the pressure distribution can be measured more accurately.

[Brief description of drawings]

FIG. 1 is a plan view showing an external configuration of a pressure distribution measuring detector according to an embodiment of the present invention, and FIG. 2 is a line AA of FIG.
3 is a bottom view of the same embodiment, FIG.
The drawing is a plan view showing an example of the configuration of a net-like body knitted by the detectors of the same embodiment. 1 ... Pressure sensor, 2, 2a-2d ... Gauge lead, 3 ... Casing, 3c, 3d ... Inclined part, 8, 8a-8d ... Lead wire, 8e ... Piano wire, 9 ... Cable , 10a to 10d ... Cable connecting hole, 12 ... Partition part, 13 ... Printed circuit board, 14a-14e ... Conductive pattern, 15 ... Detector, 16 ... Cable.

Claims (1)

[Claims] 1. A pressure-sensitive sensor that receives a pressure and converts the pressure into an electric signal, and an overall shape is a disk shape, and an inclined portion is formed so that the peripheral edge portion becomes gradually thinner as it goes outward. A casing having a large rigidity in which rope connecting portions formed of through holes are formed at a plurality of positions of the inclined portion, and the pressure sensor is integrally formed or integrally fixed with the pressure receiving surface side slightly protruding. , Fixedly held inside this casing or in the recess,
A state in which a piano wire is inserted together with a lead wire inside and a terminal plate to which a signal line derived from the pressure sensor is connected, and one end side is inserted inside the casing from the outside through an introduction hole of the casing. And a cable in which the lead wire and the piano wire are connected to the terminal plate, and a plurality of the casings are arranged at predetermined intervals, and the rope connecting portions of the casings adjacent to each other are connected by a rope. A detector for measuring pressure distribution, characterized in that a net-like body sufficient to cover a predetermined measurement region is knitted so that the pressure distribution of the measurement region can be measured.