JP2007240475A - Physical quantity distribution detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a physical quantity distribution detector capable of increasing the resolution of physical quantity distribution. <P>SOLUTION: The physical quantity distribution detector includes a conductive polymer fiber arrangement texture 10, comprising an arrangement 11 of conductive polymer fibers extending parallel to each other and an arrangement 12 of conductive polymer fibers, extending parallel to each other in a direction of crossing the arrangement 11; an energizing section 20 in electrical conduction to each conductive polymer fiber; an electrical characteristic detection sections 30 for each of the conductive polymer fibers; and an operational section 40 sectioning the conductive polymer fiber arrangement texture 10 into n×m division regions, including a plurality of crossing regions to define physical quantity for each division region as a matrix constituent element, and applying a matrix operational expression to a detected the electrical characteristic value. When the physical quantities of the division region which is an arrangement of the conductive fibers crossing each other and which includes the arrangement 12 of one conductive polymer fiber, the operational section 40 energizes the arrangement 11 of the other conductive polymer fiber crossing the arrangement 12 of the one conductive polymer fiber and controls the energizing section 20 so that the sensitivity of the division region changes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a physical quantity distribution detection device that detects a distribution of physical quantities such as pressure.

  Conventionally, as a physical quantity distribution detection device, for example, as an evaluation device for evaluating sitting comfort of a vehicle seat, comfort of shoes, and sleeping comfort of a bed, a pressure distribution detection device that measures a pressure distribution for each minute part to which pressure is applied has been known. Are known.

In this conventional pressure distribution detection device, for example, a plurality of piezoelectric elements as pressure detection sensors are arranged in a matrix, and the piezoelectric elements and the piezoelectric elements are connected via switching elements to control the switching means. There is provided a pressure distribution detection device that provides a plurality of control lines and a plurality of reading lines for reading the amount of electric charge accumulated in the piezoelectric elements, switches the piezoelectric elements to be read by the switching means, and measures the pressure for each piezoelectric element. It is known (for example, refer to Patent Document 1).
Japanese Examined Patent Publication No. 6-103233

  However, in the pressure distribution detection device as the conventional physical quantity distribution detection device, when the pressure applied to a predetermined area is divided finely to increase the resolution of the pressure distribution, or the pressure distribution applied to the large area When seeking, there is a problem that there are a large number of piezoelectric elements and switching elements corresponding to the components of the matrix.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a physical quantity distribution detecting device capable of increasing the resolution of the physical quantity distribution.

The physical quantity distribution measuring apparatus of the present invention comprises an array of conductive polymer fibers extending in parallel with each other and an array of conductive polymer fibers extending in parallel with each other in a direction intersecting the array, A conductive polymer fiber array structure that can be used as a physical quantity sensing means for sensing a physical quantity distribution in each crossing region of conductive polymer fibers extending in a direction crossing each other from a physical quantity applied to the fiber;
An energization section for energizing each conductive polymer fiber constituting the conductive fiber polymer fiber array structure;
An electrical property detector capable of detecting electrical properties of each of the conductive polymer fibers, and
In order to divide the conductive polymer fiber array structure into n × m divided regions including a plurality of intersecting regions and obtain physical quantities for each divided region, the physical quantities for each divided region are determined as matrix components. And an arithmetic unit that applies a matrix arithmetic expression to the electrical property value detected for each conductive polymer fiber using the electrical property detector.
In order to obtain the solution of the matrix calculation formula, the calculation unit calculates the physical quantity of one of the conductive fibers intersecting each other and including the one conductive polymer fiber, and determines the physical quantity of the one. The current-carrying part is controlled so that the sensitivity of the divided region is changed by energizing the other conductive polymer fiber array intersecting with the molecular fiber array.

  Preferably, the number of divided regions is four, and the arithmetic unit calculates a physical quantity for each divided region using a 4 × 4 square matrix.

  Further, it is desirable that the calculation unit repeats further dividing this divided region into four for each divided region, and obtains the physical quantity of the intersecting region for each conductive polymer fiber.

  The electrical characteristic value is the resistance value of the conductive polymer fiber, and the physical quantity is preferably pressure.

  The pressure distribution detection method of the present invention comprises an array of conductive polymer fibers extending in parallel to each other and an array of conductive polymer fibers extending in parallel to each other in a direction crossing the array, and each of the conductive polymers described above. Electricity is passed through at least one array of conductive polymer fiber arrays that can be used as a physical quantity sensing means for sensing the distribution of physical quantities in each crossing region of conductive polymer fibers extending in a direction crossing each other from the pressure applied to the fibers. Then, by detecting a change in resistance value based on the pressure applied to the other array, the pressure distribution applied to the conductive polymer fiber array structure is detected by obtaining the pressure for each crossing region.

  According to the present invention, the distribution of physical quantities applied to each crossing region using conductive polymer fibers can be measured using a determinant, so that the physical quantity distribution is not affected by the number of piezoelectric elements and switching elements. There is an effect that the resolution can be increased.

  In particular, since the physical quantity of the intersection region is determined by a software program, the number of switches can be reduced.

  In particular, it is suitable for increasing the resolution of pressure distribution measurement.

  Embodiments of a physical quantity distribution detection device and a pressure distribution detection method according to the present invention will be described below with reference to the drawings.

  In FIG. 1, 10 is a planar conductive polymer fiber array structure. The conductive polymer fiber array structure 10 includes a horizontal array 11 of conductive polymer fibers extending in parallel to each other and a vertical array of conductive polymer fibers extending in parallel to each other in a direction crossing the horizontal array 11. 12. The horizontal array 11 is composed of, for example, N conductive polymer fibers 11i, and the vertical array 12 is composed of M conductive polymer fibers 12j. Each conductive polymer fiber 11i, 12j is insulated from each other. Moreover, the intersection area | region of this conductive polymer fiber 11i and the conductive polymer fiber 12j is represented by a code | symbol (i, j). Here, the subscript i is an integer from 0 to N-1, and the subscript j is an integer from 0 to M-1.

  Here, for convenience of explanation, the number of conductive polymer fibers in the horizontal array 11 is the same as the number of conductive polymers in the vertical array 12 (N = M), and the number is It is assumed that the number is even, for example, eight.

  For the conductive polymer fibers 11i and 12j, a material containing polypyrrole, polyaniline, styrene sulfonic acid and polyphenylene vinylene is used. The conductive polymer fibers 11i and 12j are deformed when pressure is applied, and the electrical characteristics that the conductivity is changed by the deformation, and the elastic characteristics are changed when a current is passed through the conductive polymer fibers 11i and 12j. Has physical properties. The conductivity of these exemplary conductive polymer fibers 11i and 12j is, for example, 0.5 to 500 S / cm (Siemens per centimeter).

  Each length of the conductive polymer fibers 11i, 12j is, for example, L, and one end portions 11a, 12a of the respective conductive polymer fibers 11i, 12j are connected to the energization unit 20 and the electrical property detection unit 30, The other end portions 11b and 12b are grounded.

  The conductive polymer fiber array structure 10 has a physical quantity of each intersection region (i, j) of the conductive polymer fibers 11i, 12j extending in a direction intersecting with each other based on a physical quantity applied to each conductive polymer fiber 11i, 12j. This is used as a physical quantity sensing means for sensing the distribution, which will be described in detail later.

  The energization unit 20 has a function of energizing the conductive polymer fibers 11 i and 12 j constituting the conductive fiber polymer fiber array structure 10, and the energization unit 20 is controlled by the operation unit 40. The electrical characteristic detector 30 can detect the electrical characteristics of each of the conductive polymer fibers 11i and 12j.

  For example, as shown in FIG. 2, the energization unit 20 includes (N + M) switching elements 20a and current limiting resistors 20b. The (N + M) switching elements 20a are turned on / off by an on / off signal S1 from the calculation unit 40, whereby a constant current I1 flows through the conductive polymer fibers 11i, 12j. As shown in FIG. 3, the electrical characteristic detector 30 includes (N + M) switching elements 30a, a reference resistor 30b, a buffer circuit 30c, and an analog-digital converter 30d. The (N + M) switching elements 30a are turned on / off by an on / off signal S2 from the arithmetic unit 40. Here, the electrical property detector 30 has a function of detecting the resistance value R as the electrical property of each of the conductive polymer fibers 11i and 12j.

  It is assumed that the physical properties of each of the conductive polymer fibers 11i and 12j are the same, and the conductivity changes when pressure is applied to the conductive polymer fibers 11i and 12j. When the resistance value R obtained by the reciprocal of the electrical conductivity of the conductive polymer fiber and the length L is detected, the pressure applied to one conductive polymer fiber is determined in principle.

Assuming that one conductive polymer fiber is divided into N sections, if the resistance per section is Rk,
R = ΣRk (k is a positive integer from 1 to N) (1)
As required.

Since the resistance value Rk is determined by the pressure value Pk (pressure applied to the section k), Rk = f (Pk) (2) using the function f.
As required.

  Since the function f varies depending on the physical characteristics of the conductive polymer fiber, the function f can be obtained, for example, using an approximate expression when converting the electrical resistance value into the pressure value.

  That is, when the resistance value R is obtained, the resistance value R can be converted into the pressure P using the resistance value R.

  The electrical property detector 30 has a reference resistance value Ri of the reference resistor 30b, a resistance value between both ends 11a-11b of the conductive polymer fiber, a resistance value between 12a-12b, Rf, and a resistance value of each switching element 30a Rs, Assuming that the power supply voltage is V, a voltage Vf generated between both ends 11a-11b and 12a-12b of the conductive polymer fiber is detected.

  This voltage Vf is converted into a digital signal by the analog-digital converter 30d and input to the arithmetic unit 40.

The resistance value Rf can be obtained from the voltage Vf using the following relational expression.
Vf = V × (Rf + Rs) / (Rf + Rs + Ri) (3)
Therefore, the resistance value Rf can be obtained for each conductive polymer fiber by measuring the voltage value Vf of each conductive polymer fiber 11i, 12j. If this resistance value Rf is obtained, the conductive polymer fiber can be obtained. The pressure applied to the fibers 11i and 12j can be obtained.

  However, the resistance value Rf is obtained as the resistance value Rf per length L of the conductive polymer fiber, and the resistance value Rk for each section obtained by dividing the length L of the conductive polymer fiber into N sections. Absent. Therefore, it is not the pressure Pk for each section of the conductive polymer fiber. Accordingly, the pressure Pij for each intersecting region (i, j) of the conductive polymer fiber cannot be obtained as it is.

  Accordingly, as schematically shown in FIG. 5, the calculation unit 40 divides the conductive polymer fiber array structure 10 into n × m divided regions including a plurality of intersecting regions (i, j), thereby dividing each division. In order to obtain the physical quantity (resistance value corresponding to pressure) for each area, the physical quantity (resistance value corresponding to pressure) for each divided area is defined as a matrix component, and each electrical characteristic detection unit 30 is used to define each physical quantity (resistance value corresponding to pressure). It is configured to have a function of applying a matrix arithmetic expression to a resistance value R as an electrical characteristic value detected for each of the conductive polymer fibers 11i and 12j.

Here, for convenience of explanation, it is assumed that the number of divided regions is four, and the calculation unit 40 calculates a physical quantity for each divided region using a 4 × 4 square matrix. Here, in the quadrants a ₀₀ , a ₀₁ , a ₁₀ and a ₁₁ , for example, an even number (four in this case) of conductive polymer fibers (11 _{1 to} 11 ₄ , 11 _{5 to} 11 ₈ ) are arranged vertically and horizontally, respectively. , 12 _{1 to} 12 ₄ , 12 _{5 to} 12 ₈ ). Further, the pressure applied to each of the divided regions a ₀₀ , a ₀₁ , a ₁₀ , a ₁₁ is P ₀₀ , P ₀₁ , P ₁₀ , P _11, and the resistance corresponding to the pressures P ₀₀ , P ₀₁ , P ₁₀ , P ₁₁ The values are R ₀₀ , R ₀₁ , R ₁₀ , R ₁₁ . The resistance values R ₀₀ , R ₀₁ , R ₁₀ , R ₁₁ of the divided regions a ₀₀ , a ₀₁ , a ₁₀ , a ₁₁ should be considered as planar composite resistance values, and each conductive polymer fiber has the same physical properties. Can be represented by a linear sum of the conductive polymer fibers 12i in the vertical array 12 and the conductive polymer fibers 11j in the horizontal array 11, and is decomposed into the horizontal array 11 and the vertical array 12. Even if the resistance value is obtained, it can be understood that the resistance value is the same.

Then, the following relational expressions hold for the divided areas a ₀₀ , a ₀₁ , a ₁₀ , and a ₁₁ shown in FIG.

R ₀₀ + R ₀₁ = R _h0
R ₁₀ + R ₁₁ = R _h1
R ₀₀ + R ₁₀ = R _v0
R ₀₁ + R ₁₁ = R _v1
Here, the resistance value R _h0 is the sum of the resistance values of the four conductive polymer fibers in the horizontal array 11 in the divided regions a ₀₀ and a ₀₁ , and the resistance value R _h1 is in the divided regions a ₁₀ and a ₁₁ . The resistance value R _v0 is the resistance value of the four conductive polymer fibers of the vertical array 12 in the divided regions a ₀₀ and a ₁₀ . The resistance value R _v1 is the sum of the resistance values of the four conductive polymer fibers in the longitudinal array 12 in the divided regions a ₀₁ and a ₁₁ , and these resistance values R _{h1 to} R _v1 are these Each resistance value of the conductive polymer fiber in the divided region is obtained by controlling the electrical property detector 30. The above expression is expressed by a determinant as the following [Equation 1].

この行列式を用いて、マトリックス構成要素としての抵抗値Ｒ₀₀、Ｒ₀₁、Ｒ₁₀、Ｒ₁₁を求めようとしても、クラメールの定理によって行列式の値が「０」となり解が得られない。

Even if an attempt is made to obtain resistance values R ₀₀ , R ₀₁ , R ₁₀ , and R ₁₁ as matrix components using this determinant, the value of the determinant becomes “0” by Kramer's theorem and no solution is obtained. .

For example, for the above simultaneous equations,
Clearing the R ₀₀ using the formula R ₀₀ + R ₀₁ = R _h0 and _{R 00 + R 10 = R v0} ,
R ₀₁ −R ₁₀ = R _h0 −R _v0 ,
Erasing R ₁₁ using the formula R ₁₀ + R ₁₁ = R _h1 and R ₀₁ + R ₁₁ = R _v1
R ₁₀ −R ₀₁ = R _h1 −R _v1 ,
When a two equations of _{R 01 -R 10 = R h0 -R} v0 and _{R 10 -R 01 = R h1 -R} v1 attempts to find the R ₀₁ or R _10, "0" left term is, and the resistance value As a result, R ₀₀ , R ₀₁ , R ₁₀ and R ₁₁ cannot be obtained.

  Therefore, in order to obtain the solution of the matrix calculation formula, the calculation unit 40 is one of the conductive fiber arrays 11 and 12 that intersect each other and calculates the physical quantity of the divided region including the one conductive polymer fiber array. The current-carrying section 20 is controlled so that the other conductive polymer fiber array 11 intersecting the conductive polymer fiber array 12 is energized to change the sensitivity of the divided region.

Here, the arithmetic unit 40 controls the energization unit 20, the resistance value R ₁₁ of the divided region a ₁₁ four duty conductive polymer fibers 12 _{5-12 8} vertical array 12 in the divided region a ₁₁ Is obtained, a constant current I ₁ is supplied to the four conductive polymer fibers 11 _{5 to} 11 ₈ in the horizontal array 12 in the divided regions a ₁₀ and a ₁₁ as indicated by arrows. Then, by supplying the constant current I ₁ , the elasticity characteristics of the four conductive polymer fibers 11 _{5 to} 11 _{8 in} the lateral array 12 are changed.

When the conductive polymer fibers 11 _{5 to} 11 ₈ intersecting with the conductive polymer fibers 12 _{5 to} 12 ₈ to be detected are energized, their elasticity characteristics change, so that the conductive polymer fibers 12 ₅ to 12 ₅ to be detected are changed. Since the deformation amount of 12 ₈ is different, even if the same pressure P ₁₁ is applied to the divided region a ₁₁ , the resistance value R ₁₁ of the conductive polymer fiber to be detected is different.

For example, as shown in FIG. 4A, the conductive polymer fiber in the vertical direction when pressure P is applied when no current is passed through the conductive polymer fiber X in the horizontal direction (I ₁ = 0). When the resistance value of Y is Rx and the same pressure P is applied when a current is passed through the conductive polymer fiber X in the lateral direction (I ₁ = I ₁ ) as shown in FIG. If the resistance value of the conductive polymer fiber Y in the longitudinal direction is Rx ′, the change ratio γ is
γ = Rx ′ / Rx.

  This ratio γ can also be expressed as “sensitivity” in the sense that even when the applied pressure P is constant, the measured resistance value changes by changing the flowing current. Since γ can be uniquely determined by determining the current to be applied to the conductive polymer fiber and the pressure to be applied, it can be determined in advance.

Conductive polymer fibers of the longitudinal array 12 in the divided region a ₁₁ is, in the case shown in FIG. 5 are the four conductive polymer fibers 11 _5-11 of transversely aligned 11 in the divided region a _{11 8} four for flowing the same current, changes the sensitivity of the divided areas a _11. Each ratio γ is the same for each conductive polymer fiber 12 _{5 to} 12 ₈ , and the pressure is defined as a force per unit area, so even if the number changes and the area increases, the ratio per unit area is Since γ, α = γ, and using this sensitivity α, a matrix arithmetic expression is created to obtain [Expression 2].

すなわち、分割領域ａ₀₀、ａ₀₁内の横配列１１の導電性高分子繊維１１₁〜１１₄と分割領域ａ₁₀、ａ₁₁内の横配列１１の導電性高分子繊維１１₅〜１１₈の抵抗値を検出するときと、分割領域ａ₀₀、ａ₁₀内の縦配列１２の導電性高分子繊維１２₁〜１２₄の抵抗値を検出するときとには、いずれの導電性高分子繊維にも通電を行わずに、演算部４０は各抵抗値Ｒ_h0、Ｒ_h1、Ｒ_v0を検出する。

That is, the conductive polymer fibers 11 _{1 to} 11 ₄ in the horizontal array 11 in the divided regions a ₀₀ and a ₀₁ and the conductive polymer fibers 11 _{5 to} 11 ₈ in the horizontal array 11 in the divided regions a ₁₀ and a ₁₁ are arranged. and when detecting a resistance value, to the time of detecting the resistance value of the divided regions a _00, a ₁₀ conductive vertical array 12 of the polymer fibers 12 ₁ to 12 _4, in any of the conductive polymer fibers In addition, without conducting current, the calculation unit 40 detects the resistance values R _h0 , R _h1 , R _v0 .

When detecting the resistance value of the conductive polymer fibers 12 _{5 to} 12 ₈ in the longitudinal array 12 in the divided regions a ₀₁ and a ₀₂ , the arithmetic unit 40 controls the energizing unit 20 to within the divided regions a ₁₀ and a ₁₁ . The four conductive polymer fibers 11 _{5 to} 11 ₈ in the horizontal array 11 are energized, and the resistance of the conductive polymer fibers 12 _{5 to} 12 ₈ in the vertical array 12 in the divided regions a ₀₁ and a _{02 at} that time. The value R _v1 is detected.

The resistance value R ₁₁ is obtained from the equation [2].

For example, when [Expression 2] is expressed by simultaneous equations,
R ₀₀ + R ₀₁ = R _h0 (4-1)
R ₁₀ + R ₁₁ = R _h1 (4-2)
R ₀₀ + R ₁₀ = R _v0 (4-3)
R ₀₁ + αR ₁₁ = R _v1 (4-4)
here,
Clearing the R ₁₀ by using the equation (4-3) of the formula R ₁₀ + R ₁₁ = R _h1 and _{(4-1) R 00 + R 10} = R v0,
R ₁₁ −R ₀₀ = R _h1 −R _v0 (4-5)
The formula is obtained.

Further, when R ₀₁ is erased using the equation (4-1) of R ₀₀ + R ₀₁ = R _h0 and the equation (4-4) of R ₀₁ + αR ₁₁ = R _v1 ,
R ₀₀ −αR ₁₁ = R _h0 −R _v1 (4-6)
The formula is obtained.

When R ₀₀ is erased using the equations (4-5) and (4-6),
R ₁₁ −αR ₁₁ = R _h1 −R _v0 + R _h0 −R _v1 (4-7)
When this equation (6) is transformed,
(1-α) R ₁₁ = (R _h1 + R _h0 ) − (R _v1 + R _v0 ) (4-8)
The formula is obtained.

Here, the sensitivity α is a known value obtained by advance calculation, since the resistance value _{R v0, R h0, R h1} , R v1 is a known value obtained by the measurement, the divided areas a ₁₁ The resistance value R ₁₁ is obtained by solving the equation (4-8).

When the resistance value R ₁₁ of the divided region a ₁₁ is obtained, for example, the electrical resistance value R ₁₀ of the divided regions a ₁₀ obtained by solving the equation (4-2), by solving the equation (4-4) Motomari electrical resistance value R ₀₁ of the divided regions a _01, equation (4-1) is electric resistance value R ₀₀ of the divided regions a ₀₀ using obtained, all the divided areas a _00, a _01, a ₁₀ , A ₁₁ corresponding to electrical resistance values R ₀₀ , R ₀₁ , R ₁₀ , R ₁₁ are obtained. The electrical resistance values R ₀₀ , R ₀₁ , R ₁₀ , and R ₁₁ can be converted to pressures P ₀₀ , P ₀₁ , P ₁₀ , and P ₁₁ using approximate equations.

Next, as shown in FIG. 6, the divided areas a ₀₀ and a ₀₁ are divided into upper and lower parts, and the divided area a ₁₀ and divided area a ₁₁ are divided into upper and lower parts. This divided area is represented by the symbols a _00h0 , a _01h0 , a _00h1 , a _01h1 , a _10h0 , a _11h0 , a _10h1 , a _11h1 .

Divided areas _{a 00h0, a 01h0, a 00h1} , groups and divided areas of _a 01h1 a 10h0, a 11h0,
The two conductive fibers (11 ₁ , 11 ₂ ), (11 ₃ , 11 ₄ ), (11 ₅ , 11 ₆ ), (11 ₇ ) in the horizontal array 11 are considered separately as a group of a _10h1 and a _11h1. , 11 ₈ ) to measure the resistance value.

Physical quantity (resistance or pressure) and the physical size of the divided region a _11H1 divided regions a _01H1 when measuring (resistance or pressure), the divided areas a _01, a 4 pieces of conductive high vertical array 12 of ₁₁ The molecular fibers 12 _{5 to} 12 ₈ are energized to change the sensitivity of the divided regions a _01h1 and a _11h1 .

In this way, two conductive polymer fibers in the divided regions _{a 00h0, a 01h0 (11 1} , 11 2), divided areas a _00H1, two conductive polymer fibers in _a 01h1 (11 ₃ , 11 _4), the divided areas _a 10h0, a 2 pieces of conductive polymer fibers in _{11h0 (11 5, 11 6)} , divided areas a _10h1, 2 pieces of the conductive polymer fibers in _a 11h1 (11 ₇ , 11 ₈ ). These values are _Rh00 , _Rh01 , _Rh10 , and _Rh11 , respectively.

_Further , the resistance values of the divided areas _a00h0 , _a01h0 , _a00h1 , _a01h1 , _a10h0 , _a11h0 , _a10h1 , _a11h1 are set to _R00h0 , _R01h0 , _R00h1 , _R01h1 , _R10h0 , _R11h0 , Let _R10h1 and _R11h1 .

Then, the divided areas a _00h0 , a _01h0 , a _00h1 , a _01h1 and the divided areas a _10h0 ,
With _{respect to} the groups a _11h0 , a _10h1 and a _11h1 , [Expression 3] and [Expression 4] are obtained.

In [Expression 3] and [Expression 4], the resistance values R ₀₀ , R ₀₁ , R ₁₀ , and R ₁₁ are divided regions a ₀₀ ,
Since the values of a ₀₁ , a ₁₀ , and a ₁₁ have already been obtained and the values of the determinants of [Expression 3] and [Expression 4] are not “0”, [Expression 3], [Expression 4] Using the formula, the divided areas a _00h0 , a _01h0 ,
_{a 00h1, a 01h1, a 10h0} , a 11h0, a 10h1, a respective resistance values of _{11h1 R 00h0, R 01h0, R} 00h1, R 01h1, R 10h0, R 11h0, R 10h1, R 11h1 is obtained.

Similarly, as shown in FIG. 7, the divided areas a ₀₀ and a ₀₁ are divided into left and right parts, and the divided areas a ₁₀ and a ₁₁ are divided into right and left parts. This divided area is _designated as a _00v0 , a _00v1 ,
a _01v0 , a _01v1 , a _10v0 , a _10v1 , a _11v0 , a _11v1 .

Divided areas _{a 00v0, a 00v1, a 10v0} , groups and divided areas of _a 10v1 a 01v0, a 01v1,
The resistance value is measured for each of the two conductive fibers in the longitudinal array 12 in consideration of a group of a _11v0 and a _11v1 .

At that time, when measuring the physical quantity of the divided regions _a 10v1 (resistance or pressure) and the physical size of the divided region _a 11v1 (resistance or pressure), four lateral array 11 in the divided region a _10, a ₁₁ The conductive polymer fibers 11 _{5 to} 11 ₈ are energized to change the sensitivity of the divided regions a _10v1 and a _11v1 .

In this way, two conductive polymer fibers in the divided regions _{a 00v0, a 10v0 (12 1} , 12 2), divided areas a _00V1, two conductive polymer fibers in _a 10v1 (12 ₃ , 12 ₄ )
Two conductive polymer fibers in the divided regions _{a 01v0, a 11v0 (12 5} , 12 6), 2 pieces of the conductive polymer fibers in the divided regions _a 01v1, a 11v1 (12 _7, 12 ₈₎ Find the resistance value. These values are R _v00 , R _v01 , R _v10 , and R _v11 , respectively.

_Further , the resistance values of the divided areas a _00v0 , a _10v0 , a _00v1 , a _10v1 , a _01v0 , a _11v0 , a _01v1 , a _11v1 are set to R _00v0 , R _10v0 , R _00v1 , R _10v1 , R _01v0 , R _11v0 , Let _R01v1 and _R11v1 .

Then, a group of divided areas a _00v0 , a _00v1 , a _10v0 , a _10v1 and divided areas a _01v0 ,
About a _01v1 , a _11v0 and a _11v1 groups

[Expression 5] and [Expression 6] are obtained.

In [Expression 5] and [Expression 6], the resistance values R ₀₀ , R ₀₁ , R ₁₀ , and R ₁₁ are divided areas a ₀₀ ,
Since the values of a ₀₁ , a ₁₀ , and a ₁₁ have already been obtained and the values of the determinants of [Formula 5] and [Formula 6] are not “0”, [Formula 5], [Formula 6] Using the equation, the resistance values of the divided areas a _00v0 , a _10v0 , a _00v1 , a _10v1 , a _01v0 , a _11v0 , a _01v1 , a _11v1 are set to R _00v0 , R _10v0 , R _00v1 , R _10v1 , R _01v0 , R _11v0 , R _01v1 and R _11v1 are obtained.

In order to obtain the resistance value Rij of the intersecting region (i, j) per each conductive polymer fiber, the divided region a ₀₀ , the divided region a ₀₁ , the divided region a ₁₀ , and the divided region a ₁₁ are each divided into four. Repeat this.

FIG. 8 shows an example in which the divided area a ₀₀ is divided into four as an example. In FIG. 8, reference numerals a ₀₀₀ , a ₀₀₁ , a ₀₁₀ , and a ₀₁₁ denote small divided areas of the divided area a _00. , R ₀₀₀ ,
R ₀₀₁ , R ₀₁₀ , and R ₀₁₁ indicate resistance values for every two conductive polymer fibers in each divided region.

  This resistance value can be obtained in the same procedure as the resistance value of each divided region of the four divided regions shown in FIG.

In this case, the resistance values obtained by the division shown in FIGS. 7 and 8 can be used for the calculation. Therefore, the resistance values R ₀₁₁ of the two conductive polymer fibers in the longitudinal array 12 with respect to the divided region a ₀₁₁ are obtained. When the two conductive polymer fibers 11 ₃ and 11 ₄ in the horizontal array 11 in the divided regions a ₀₁₀ and a ₀₁₁ are energized to obtain the two conductive polymer fibers (12 ₃ , Only the resistance value R _v01 of 12 ₄ ) is measured.

  Then, the following [Expression 7] is obtained.

なお、感度αは通電される導電性高分子繊維の本数によらない係数である。

The sensitivity α is a coefficient that does not depend on the number of conductive polymer fibers to be energized.

By solving this [Equation 7], the division resistances R ₀₀₀ , R ₀₀₁ , R ₀₁₀ , and R ₀₁₁ for each of the small division regions a ₀₀₀ , a ₀₀₁ , a ₀₁₀ , and a ₀₁₁ can be obtained.

  When the division shown in FIGS. 5 to 8 is repeated, finally, the resistance, i.e., the pressure, for the crossing region (i, j) per each conductive polymer fiber can be obtained.

  That is, when a pressure is applied to each of the conductive polymer fiber array structures 10, the pressure can be measured for each intersection region (i, j), and the resolution of the pressure distribution can be increased.

  The arithmetic unit 40 incorporates a program that repeatedly executes the above processing procedure.

  Next, the processing procedure by the calculation unit 40 will be described with reference to the flowchart shown in FIG.

  First, as shown in FIG. 5, the region is divided into two vertically and horizontally, and the resistance values for the divided regions in total are obtained (S.1). Next, as shown in FIG. 6, the divided region is divided into two in the vertical direction, and the resistance value of each divided region is obtained (S.2). Next, as shown in FIG. 7, the divided area is divided into left and right parts, and the resistance value of each divided area is obtained (S.3). Next, it is determined whether or not resistance has been obtained for each crossing region (i, j) of each conductive polymer fiber (S.4).

  S. 4, in the case of yes, S. The process proceeds to 5, and the resistance value is converted into pressure using the functional relationship between the resistance value and the pressure. S. 4, in the case of No, S.D. is obtained until the resistance value is obtained for the crossing region (i, j) per one of the conductive polymer fibers. 1-S. Repeat 4

  And S. 5 until the predetermined time has elapsed after conversion to the pressure value (S.6). 1-S. Repeat step 5. Thereby, the distribution of the pressure applied to the conductive polymer fiber array structure 10 can be measured at regular time intervals.

  The pressure distribution detection method of the present invention comprises an array of conductive polymer fibers extending in parallel to each other and an array of conductive polymer fibers extending in parallel to each other in a direction crossing the array, and each conductive polymer fiber Energizing at least one array of conductive polymer fiber arrays that can be used as a physical quantity sensing means for sensing the distribution of physical quantities in each crossing region of conductive polymer fibers extending in a direction crossing each other from the pressure applied to the conductive polymer fibers. By detecting a change in resistance value based on the pressure applied to the other array, the pressure for each crossing region can be obtained and used to detect the pressure distribution applied to the conductive polymer fiber array structure.

  This pressure distribution detection method is used, for example, to roughly detect the occupant's posture when controlling the deployment strength of the airbag according to the occupant's posture in order to prevent injury to the occupant during airbag deployment control. In this case, the position of the center of gravity of the seat pressure is determined by detecting the position of the occupant, and the position of the center of gravity of the occupant can be roughly determined in the longitudinal direction of the seat in order to determine the position of the occupant when the airbag is deployed. It is not necessary to obtain the pressure distribution for the intersecting region (i, j) for each of the conductive polymer fibers. That is, it is not necessary to increase the resolution of the pressure distribution. Also, a low resolution is sufficient for the pressure distribution in the lateral direction of the seat.

  On the other hand, in order to optimize the driver position, it is necessary to control the height and inclination of the seat and the front and rear position of the seat, so it is necessary to increase the resolution of the pressure distribution on the seat surface. .

  Therefore, this pressure distribution detection method can be used by changing the resolution according to the application.

It is a block circuit diagram of the physical quantity distribution detection apparatus concerning this invention. It is a block diagram which shows the detailed structure of the electricity supply part shown in FIG. It is a block diagram of the electrical property detection part shown in FIG. It is a figure for demonstrating an example of how to obtain | require the sensitivity used for the calculation of this invention, Comprising: (a) is to the conductive polymer fiber of the horizontal direction at the time of calculating | requiring the resistance value of the conductive polymer fiber of the vertical direction. (B) shows the energized state of the conductive polymer fiber in the horizontal direction when the resistance value of the conductive polymer fiber in the vertical direction is determined. It is a schematic diagram in the case where the resistance value is obtained by dividing the vertical and horizontal conductive polymer fibers into four vertically and two horizontally to form four divided regions. FIG. 6 is a schematic diagram when the resistance value is obtained by further dividing the four-divided region shown in FIG. FIG. 6 is a schematic diagram when the resistance value is obtained by further dividing the 4-divided region shown in FIG. 5 into left and right parts to form an 8-divided region. FIG. 6 is a schematic diagram when a resistance value is obtained by further dividing each of the four divided regions shown in FIG. 5 into four to form sixteen divided regions. It is a flowchart figure of the physical quantity distribution detection apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Conductive polymer fiber arrangement | sequence structure 11, 12 ... Array 20 ... Current supply part 30 ... Electrical property detection part 40 ... Calculation part

Claims (5)

A direction composed of an array of conductive polymer fibers extending in parallel with each other and an array of conductive polymer fibers extending in parallel with each other in a direction crossing the array, and a direction intersecting with each other from a physical quantity applied to each of the conductive polymer fibers A conductive polymer fiber array structure that can be used as a physical quantity sensing means for sensing the distribution of the physical quantity of each crossing region of the conductive polymer fiber extending in
An energization section for energizing each conductive polymer fiber constituting the conductive fiber polymer fiber array structure, and an electrical characteristic detection capable of detecting the electrical characteristics of each of the conductive polymer fibers. And
In order to divide the conductive polymer fiber array structure into n × m divided regions including a plurality of intersecting regions and obtain physical quantities for each divided region, the physical quantities for each divided region are determined as matrix components. And an arithmetic unit that applies a matrix arithmetic expression to the electrical property value detected for each conductive polymer fiber using the electrical property detector.
In order to obtain the solution of the matrix calculation formula, the calculation unit calculates the physical quantity of one of the conductive fibers intersecting each other and including the one conductive polymer fiber, and determines the physical quantity of the one. An apparatus for measuring a physical quantity distribution, wherein the energization unit is controlled by energizing an array of other conductive polymer fibers intersecting with an array of molecular fibers to change the sensitivity of the divided region.
However, n and m are positive integers.   2. The physical quantity distribution measuring apparatus according to claim 1, wherein the number of the divided areas is four, and the calculation unit calculates a physical quantity for each of the divided areas using a 4 × 4 square matrix.   The said calculating part calculates | requires the physical quantity of the cross | intersection area | region for each one of each each conductive polymer fiber by repeating dividing | segmenting this divided area further finely into 4 for every said divided area. The physical quantity distribution measuring device according to 1.   The physical quantity distribution measuring apparatus according to any one of claims 1 to 3, wherein the electrical characteristic value is a resistance value of the conductive polymer fiber, and the physical quantity is a pressure.   A direction composed of an array of conductive polymer fibers extending parallel to each other and an array of conductive polymer fibers extending parallel to each other in a direction crossing the array, and a direction crossing each other from the pressure applied to each of the conductive polymer fibers The pressure applied to the other array by energizing at least one array of conductive polymer fiber arrays that can be used as a physical quantity sensing means that senses the distribution of physical quantities in each crossing region of the conductive polymer fibers extending to A pressure distribution detection method for detecting a pressure distribution applied to a conductive polymer fiber array structure by obtaining a pressure for each crossing region by detecting a change in resistance value based on the resistance value.

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