JPS6035606B2 - surface pressure detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface pressure detector used to detect the sum of surface pressures applied to an arbitrarily shaped surface, its center of gravity, the area of the plane, its center, etc.

According to a surface pressure detector having a square planar shape in which a pressure-sensitive plate whose electrical resistance changes when pressurized is sandwiched between a pair of sheet resistors, the pair of opposite sides of one sheet resistor and the other By providing electrodes on the other pair of opposite sides of the sheet resistor, the total surface pressure and its center of gravity can be detected. Therefore, in consideration of application to various uses, it is often desirable that the surface pressure detector has a shape other than a square. However, if the planar shape of both pressure detectors is not square, the total surface pressure and its center of gravity can be accurately detected by installing electrodes at any position of each sheet resistor. There is a problem with whether this is true or not. The present invention
In view of the above, a surface pressure detector formed on an arbitrarily shaped surface can be easily formed in the same manner as the square surface pressure detector described above, and can accurately detect the sum of surface pressure, etc. A pressure-sensitive plate whose electrical resistance changes at 4 corresponding to each vertex of the square on the detector.
Find the points, divide the sides of each sheet resistor into two pairs of opposite sides using those four points, and divide one pair of opposite sides on one sheet resistor and the other pair on the other sheet resistor. The feature is that an electrode is formed on each opposite side of the electrode.

Hereinafter, the present invention will be explained in detail based on the drawings.
In the figure, 1 is a surface pressure detector, and 10 is an arithmetic circuit connected to it. It is equipped with a pressure-sensitive plate 2 made of variable pressure-sensitive dew conductive rubber, etc., and its both sides are covered with planar resistors 3 and 4 made of a highly conductive breakable material.
The planar shape is formed into an arbitrary shape by sandwiching the two.

The upper and lower sheet resistors 3 and 4 in the self-surface pressure detector 1 are provided with electrodes S, S3 and S2, S4 facing each other in the x direction and the y direction. is obtained on detector 1 as explained below.
With points A' to D' as a reference, electrodes S, S3 are connected between points A'B' and C'〇 on the upper sheet resistor 3, and points BC', S3 are placed between the points A'B' and C'〇 on the lower sheet resistor 4. 〇 Electrode S2 between A'
, S4 are respectively arranged. To find the four points A' to D' for providing electrodes on the detector 1 (see Figure 3), 'a'y2u (x, y) = y2v (x, y) =
It is sufficient to map the square area 8 in the uv plane to the area Q indicating the planar shape of the detector 1 in the xy plane by mapping (x, y) that satisfies the condition of 0 (k: constant). The vertices A to ○ can be set as the points A' to ○ in the region Q.

Further, each of the above points A' to D' can also be determined by applying conformal mapping in the theory of complex functions. That is, x
The area Q in the y plane is defined as the boundary correspondence and A'→A, B'
Conformal mapping (u, v) = f (x,
y), thereby determining the positions of points A', B', and 〇, and using the inverse function f-1 of the above function f,
Point 0 can be found by mapping point D on the plane onto the xy plane. In this case, it is a matter of course that the above two conditions 'a-,'b} are satisfied. To use the pressure detector of the above configuration, as shown in FIG.
A voltage +Vo is applied to the electrodes S2 and S4 via the resistance Ro, and a voltage -Vo is applied to the electrodes S2 and S4 via the resistance Ro.
, ~S4 voltages V^, Vc, VB, and Vo can be input to the next stage arithmetic circuit 10.

The arithmetic circuit 10 calculates the voltages V^, V8 of the electrodes S, , S3.
The voltage Vc of the subtraction circuit 11 and the electrodes S2 and S4 that applies
, VD are respectively provided, and the outputs from the subtracting circuits 11 and 12 are input to dividing circuits 13 and 14, respectively. In parallel with this, the voltage Vc of the electrode S2 is applied to the subtraction circuit 15.
At the same time, the voltage Vo of the electrode S4 and the voltage -Vo are applied to the subtraction circuit 16, and the outputs from these subtraction circuits 15 and 16 are input to the next stage addition circuit 17, and the addition circuit While taking out the output o mountain 3 from 17,
The output out3 is inputted to the division circuits 13 and 14, respectively, and outputs ouL,
This is to take out the o-mount 5. Note that the arithmetic circuit 10'
Here, the output out3 from the adder circuit 17 is
The circuit was configured to calculate 3=2Vo+Vc+Vo, but since the voltage Vc+Vo and the voltage -(V^+V8) are equal, the circuit is configured so that the above output out3 is calculated as ou=2Vo-VA-VB. You can also do that. Furthermore, in the arithmetic circuit 10, the voltage -Vo is applied to the negative terminals of the subtraction circuits 15 and 16, but an addition circuit is used in place of the subtraction circuits 15 and 16, and the voltage +Vo is applied to their positive terminals. Of course you can. The three outputs ou extracted from the arithmetic circuit 10 in this way
Outs indicate the total surface pressure to be determined, etc., but the content of each output differs depending on which of the characteristics shown in FIG. 2 is used as the pressure sensitive plate 2 in the detector 1. In other words, when the pressure sensitive plate 2 is of a type in which the resistance decreases in approximately inverse proportion to the pressure as shown in FIG. The x and y coordinates of the center of gravity G (x, y) are shown, respectively, and the resistance decreases in inverse proportion to the n plan of pressure (generally 1<n<3), as shown at the bottom of Figure 2. is used, the output o-mount 3 is the sum of the n-mill values of the surface pressure distribution, and the output outputs Put4 and out5 are the center of gravity Gy.
The yanagi and yn coordinates of (skin, yn) are shown respectively, and as shown in Figure 2 C, the resistance changes from infinity to a constant value close to zero by applying pressure above a certain value. In this case, the output out3 is the area of the surface facing the surface pressure detector 1, and the outputs out4 and out5 are the center ○
The Shigeru and ya coordinates of (Shigeru, omitted) are shown respectively. In this way, the target summation of surface pressure, etc. is detected by taking out the three outputs out3 to out from the arithmetic circuit 10, and the outputs out4 and out5 are
.

The physical quantities represented by the outputs ouL to out3 are each expressed by the following equations. out
, = J'ou(x, y)・i(x,y) dy=(gijujik)([VA]S・−[VAWout2=JJQv(
x, y)・i(x, y) Rudder dyF (Sagi Juken k-1) ([
vB]S2-[VB]anchor) out3:J' is i(x, y
) Ship dy2Vo-[vA]S, 1[vA]$ = R.

2Vo+[vB]S20[vB]S4 =R.

however, r: surface resistance of sheet resistors 3 and 4 vA: Voltage of upper sheet resistor 3 vB: Voltage of lower sheet resistor 4 i: Current density from the front surface to the back surface Back: Length of one side of the above square shows.

Here, r is considered to be 4 times tenths, so vA,
vB is approximately constant, and i(x, y) is calculated using a certain function g for pressure P(x, y) due to the characteristics of the pressure sensitive plate 2.
, y)=g(P(x,y)), and therefore, in particular, u=x, v=y, and the conditions 'a', (
Assuming that b' is satisfied, out4 is obtained by dividing ou et al. by ou et al., and o mountain 5 is obtained by dividing out2 by out3.
The position of the center of gravity of g(P) in the Cartesian coordinate system is known, and o
ut3 itself indicates its size.

As described above, according to the surface pressure detector of the present invention, a non-square detector can be simply constructed in the same way as a square detector, and the sum of the surface pressure, etc. can be accurately detected.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the surface pressure detector of the present invention in use, FIG. 2 is a characteristic diagram of its pressure sensitive plate, and FIG. 3 is an explanatory diagram of a method for determining the electrode position. 1... Surface pressure detector, 2... Pressure sensitive plate,
3, 4... Planar resistor. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A detector configured in an arbitrary shape by clamping a pressure-sensitive plate whose electrical resistance changes with the action of pressure between a pair of sheet resistors, and a detector having an arbitrary shape that is mutually compatible with the shape of the detector in the xy plane. ▲Math,
There are chemical formulas, tables, etc. ▼ Find four points corresponding to each vertex of the square in the uv plane that has a mapping relationship under the conditions, and use those four points to define two points that face each other around the periphery of the sheet resistor. 1. A pressure detector characterized in that the pressure detector is divided into a pair of opposite sides, and electrodes are provided on the pair of opposite sides of one sheet resistor and the other pair of opposite sides of the other sheet resistor.