JP2017125718A - Profile shape estimation device, profile shape estimation method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide means that suppresses power consumption of a device estimating a profile shape and measuring a perimeter.SOLUTION: A profile shape estimation device 1 comprises: a belt main body that is wound around a measurement object part of a measurement object; a plurality of first electrodes 121 that is provided side by side in a long side direction of the belt main body; a second electrode 131 that is provided in the belt main body; a plurality of curvature sensors 150 that is provided side by side in the long side direction of the belt main body; a physical action detection unit 160 that detects a prescribed physical action with respect to the belt main body; an impedance judgement unit 221 that judges presence or absence of the first electrode 121 in which impedance with respect to the second electrode 131 is equal to or less than prescribed impedance of the first electrodes 121; and a profile shape estimation unit 240 that, when the physical action detection unit 160 detects the prescribed physical action, and the impedance judgement unit 221 judges the presence of the first electrode 121, estimates a profile shape of the measurement object part on the basis of a sensor value of the curvature sensor 150.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a contour shape estimation device, a contour shape estimation method, and a program.

  In Patent Document 1, a measurement belt that is used by being wrapped around a measurement target portion of a living body, and an EIT (Electrical Impedance Tomography) measurement main body that performs predetermined arithmetic processing based on an electrical signal obtained through the measurement belt An EIT measuring device including a unit is disclosed. Patent Document 1 describes that this EIT measurement apparatus estimates the contour shape of a portion (measurement target portion) around which a measurement belt is wound and measures the peripheral length.

International Publication No. 2015/002210

  If the apparatus for estimating the contour shape of the measurement target part (measurement target part) and measuring the peripheral length can be integrated and mounted on the belt, the convenience for the user is improved. In that case, it is preferable that the power consumption of the device can be suppressed so that the device can be operated by an internal power source and a power cable is not required.

  The present invention provides a contour shape estimation device, a contour shape estimation method, and a program capable of suppressing power consumption.

  According to the first aspect of the present invention, the contour shape estimation apparatus includes a belt main body wound around a measurement target portion of a measurement target, a plurality of first electrodes provided side by side in the longitudinal direction of the belt main body, A second electrode provided on the belt main body, a plurality of curvature sensors provided side by side in the longitudinal direction of the belt main body, a physical action detecting unit for detecting a predetermined physical action on the belt main body, and the first An impedance determination unit that determines the presence or absence of a first electrode whose impedance with the second electrode is less than or equal to a predetermined impedance among one electrode, and the physical action detection unit detects the predetermined physical action, And when the said impedance determination part determines with the said 1st electrode that the impedance with said 2nd electrode is below predetermined impedance, it is based on the sensor value of the said curvature sensor. And a contour shape estimation unit for estimating the contour shape of the measurement target portion Te.

  The physical action detector may detect movement of the belt body.

  The physical action detection unit may detect a pressure on a predetermined portion of the belt body.

  You may make it further provide the circumference detection part which detects the circumference of the said measurement object part based on the impedance between said 1st electrode and said 2nd electrode.

  The perimeter detection unit is configured such that the physical action detection unit detects the predetermined physical action, and the impedance determination unit has an impedance with the second electrode equal to or lower than a predetermined impedance. When it is determined that there is one electrode, the perimeter of the measurement target portion may be detected.

  The contour shape estimation unit includes a partial shape estimation unit that estimates a partial shape that is a part of a contour of an entire circumference of the measurement target portion based on a sensor value of the curvature sensor, and the partial shape is the measurement The partial determination unit that determines which shape is the shape of the entire circumference of the target portion based on the perimeter, the determination result of the partial determination unit, and the contour shape of the entire circumference of the measurement target portion are line symmetric And an all-round shape estimating unit that estimates the contour shape of the entire circumference of the measurement target portion from the partial shape based on the assumption that

  The belt body includes a buckle having a needle portion, and the belt body is provided with a plurality of holes through which the needle portion passes in the longitudinal direction, and the first electrode is provided for each of the plurality of holes. The second electrode may be provided around the hole, and the second electrode may be provided on the needle portion.

  Of the front and back sides of the belt main body, a first shield part disposed on one side of each of the plurality of first electrodes with respect to the belt main body to limit the flow of electromagnetic waves, and the belt main body as a reference. And a second shield part that is disposed on the other side of the second electrode and restricts the flow of electromagnetic waves.

  A voltage application unit is provided that applies an in-phase AC voltage to at least one of the plurality of first electrodes and the first shield part, and applies an in-phase AC voltage to the second electrode and the second shield part. You may do it.

  According to the second aspect of the present invention, the contour shape estimation method includes a physical action detecting step for detecting a predetermined physical action on the belt main body wound around the measurement target portion of the measurement target; Among the first electrodes provided in a row in the longitudinal direction, an impedance determination step for determining the presence or absence of the first electrode whose impedance with the second electrode provided on the belt body is equal to or lower than a predetermined impedance; When the predetermined physical action is detected in the physical action detection step, and it is determined in the impedance determination step that the first electrode has an impedance with the second electrode equal to or lower than a predetermined impedance. A wheel that estimates the contour shape of the measurement target portion based on the sensor values of a plurality of curvature sensors provided side by side in the longitudinal direction of the belt body Comprising a shape estimation step.

  According to the third aspect of the present invention, the program causes the computer to detect a predetermined physical action on the belt main body wound around the measurement target portion of the measurement target, and the belt main body. Among the first electrodes provided in a row in the longitudinal direction, an impedance determination step for determining the presence or absence of the first electrode whose impedance with the second electrode provided on the belt body is equal to or lower than a predetermined impedance; When the predetermined physical action is detected in the physical action detection step, and it is determined in the impedance determination step that the first electrode has an impedance with the second electrode equal to or lower than a predetermined impedance. The contour shape of the measurement target portion is determined based on the sensor values of a plurality of curvature sensors provided side by side in the longitudinal direction of the belt body. Is a program for executing the contour shape estimation step of constant, the.

  ADVANTAGE OF THE INVENTION According to this invention, the power consumption of the apparatus which estimates a contour shape and measures circumference length can be suppressed.

It is explanatory drawing which shows the example of schematic structure of the outline shape estimation apparatus which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the example of arrangement | positioning of the sensor in the flexible substrate which concerns on 1st Embodiment. It is explanatory drawing which shows the example of arrangement | positioning of the sensor in the circuit board which concerns on 1st Embodiment. It is explanatory drawing which shows the example of arrangement | positioning of the circuit board which concerns on 1st Embodiment. It is a schematic block diagram which shows the function structure of the contour shape estimation apparatus which concerns on 1st Embodiment. In 1st Embodiment, it is explanatory drawing which shows the example of the positional relationship of the 1st electrode and the 2nd electrode in the state which the user mounted | wore with the contour shape estimation apparatus. It is explanatory drawing which shows the structural example of the electric circuit of the sensor which calculates | requires the circumference of the belt main body which concerns on 1st Embodiment. It is explanatory drawing which shows the example of the structure of the switch which turns ON when the belt main body which concerns on 1st Embodiment moves. It is explanatory drawing which shows the example of arrangement | positioning of the switch which detects the press to the predetermined part of the belt main body which concerns on 1st Embodiment. It is explanatory drawing which shows the structural example of the curvature sensor which concerns on 1st Embodiment. It is explanatory drawing which shows the example of arrangement | positioning of the strain gauge which concerns on 1st Embodiment. It is explanatory drawing which shows the comparative example of the thickness of the line connected to the strain gauge which concerns on 1st Embodiment, and the line in a strain gauge. It is explanatory drawing which shows the example of a connection which connected the bridge | bridging and signal conversion module which concern on 1st Embodiment many-to-one. It is explanatory drawing which shows the 1st example of the relationship between the impedance between the 1st electrode which concerns on 1st Embodiment, and a 2nd electrode, and the circumference of a belt main body. It is explanatory drawing which shows the 2nd example of the relationship between the impedance between the 1st electrode which concerns on 1st Embodiment, and a 2nd electrode, and the circumference of a belt main body. It is explanatory drawing which shows the 3rd example of the relationship between the impedance between the 1st electrode which concerns on 1st Embodiment, and a 2nd electrode, and the circumference of a belt main body. It is explanatory drawing which shows the example of the shape of the part of the belt main body which concerns on 1st Embodiment. It is a 1st figure explaining the partial shape estimation process which the partial shape estimation part which concerns on 1st Embodiment performs. It is a 2nd figure explaining the partial shape estimation process which the partial shape estimation part which concerns on 1st Embodiment performs. It is explanatory drawing which shows the example of the position which the partial determination part which concerns on 1st Embodiment estimates. It is explanatory drawing which shows the example of the partial shape which the perimeter shape estimation part which concerns on 1st Embodiment replicated. It is explanatory drawing which shows the example which connected the partial shape of the replication origin, and the partial shape obtained by replication in 1st Embodiment. It is explanatory drawing which shows the example of the process sequence which the contour shape estimation apparatus which concerns on 1st Embodiment detects the perimeter of a measurement object part, and estimates a contour shape. It is a flowchart which shows the example of the process sequence which the outline shape estimation part which concerns on 1st Embodiment estimates the outline shape of a measurement object part. It is a schematic block diagram which shows the function structure of the contour shape estimation apparatus which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the example of arrangement | positioning of the 1st shield part and 2nd shield part which concern on 2nd Embodiment. It is explanatory drawing which shows the example of the circuit structure which adds a voltage to the 1st shield part and 2nd shield part which concern on 2nd Embodiment. It is explanatory drawing which shows the example of arrangement | positioning of an electrode in the case of using the needle part which concerns on 1st Embodiment as a 2nd electrode.

  Hereinafter, although embodiment of this invention is described, the following embodiment does not limit the invention concerning a claim. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

<First Embodiment>
FIG. 1 is an explanatory diagram showing a schematic configuration example of a contour shape estimation apparatus according to the first embodiment of the present invention. As shown in the figure, the contour shape estimation apparatus 1 is mounted in a belt (integrated). That is, each part of the contour shape estimation apparatus 1 is mounted on the belt body 10. The belt main body 10 includes a belt part 11, a decorative case 13, a ring 14, and a buckle 15. The buckle 15 has a needle portion 16.
Hereinafter, the side where the buckle 15 is present is referred to as the head side, and the side opposite to the head side is referred to as the caudal side among the longitudinal ends of the belt body 10.

The contour shape estimation apparatus 1 detects the perimeter of the measurement target portion of the measurement target and estimates the contour shape. Specifically, when the belt main body 10 is wound around the measurement object, the contour shape estimation device 1 detects the peripheral length of the portion around which the belt main body 10 is wound, and estimates the contour shape.
Hereinafter, a case where the measurement target is a person and the measurement target portion is the abdomen (trunk) will be described as an example. However, the measurement target of the contour shape estimation device 1 is not limited to a person, and the measurement target portion of the contour shape estimation device 1 is not limited to the abdomen. For example, the contour shape estimation device 1 may detect the circumference of the abdomen of an animal and estimate the contour shape. For example, the belt main body 10 may be wound around a person's arm, and the contour shape estimation device 1 may detect the circumference of the arm and estimate the contour shape.

  On the other hand, when the measurement target is a person and the measurement target portion is the abdomen, the contour shape estimation apparatus 1 can be implemented using a belt for everyday use as a belt body 10. Thereby, the user can detect the outline shape and the perimeter of the abdomen by using the everyday belt as usual. Therefore, the user does not need to wear a device dedicated to detection and does not need to perform a special operation for detection. The user can use the abdominal contour shape and circumference information for health management such as obesity management.

In the belt portion 11, six holes are formed side by side in the longitudinal direction of the belt portion 11. The longitudinal direction of the belt portion 11 is also the longitudinal direction of the belt body 10. Hereinafter, the holes of the belt portion 11 are expressed in order from the tail side as a belt hole 12a, a belt hole 12b, ..., a belt hole 12f. The belt holes 12a to 12f are collectively referred to as a belt hole 12. The length of the ring formed by the belt can be adjusted depending on which of the belt holes 12 passes the needle portion 16. Hereinafter, the length of the ring formed by the belt is referred to as the circumferential length of the belt.
In addition, a flexible substrate 20 is provided on the belt portion 11. Specifically, the two skins constituting the belt portion 11 sandwich the flexible substrate 20.
The number of belt holes 12 is not limited to six as shown in FIG.

The decorative case 13 is provided in the vicinity of the buckle 15 and fixes the folding of the band portion 11 around which the buckle 15 is wound. Further, the decorative case 13 fixes the ring 14 to the band portion 11 with a part of the ring 14 interposed therebetween. In addition, a circuit board 30 is provided inside the decorative case 13.
The ring 14 is provided to pass the remainder of the band portion 11 after passing the needle portion 16 through the belt hole 12. By passing the surplus portion of the belt portion 11 through the ring 14, it is possible to prevent the surplus portion from being hindered such as hanging down.
The buckle 15 is a metal fitting for holding the needle portion 16 in a state where it passes through the belt hole 12.

FIG. 2 is an explanatory diagram showing an example of arrangement of sensors on the flexible substrate 20. In the contour shape estimation apparatus 1, the first electrode 121 and the second electrode 131 are used as part of a sensor that determines the circumferential length of the belt body 10. For this reason, the first electrode 121 and the second electrode 131 are referred to as sensors.
As shown in FIG. 2, the flexible substrate 20 is provided with six first electrodes 121 arranged in the longitudinal direction of the flexible substrate 20. The longitudinal direction of the flexible substrate 20 coincides with the longitudinal direction of the belt body 10 in a state where the flexible substrate 20 is mounted on the belt body 10.
Hereinafter, the first electrode 121 will be referred to as a first electrode 121a, a first electrode 121b, ..., a first electrode 121f in order from the tail side of the belt body 10. Note that both ends in the longitudinal direction of the flexible substrate 20 are distinguished by the head side and the tail side of the belt body 10 when the flexible substrate 20 is mounted on the belt body 10.

The flexible substrate 20 is provided with a plurality of curvature sensors 150 arranged in the longitudinal direction of the flexible substrate 20. A curvature sensor here is a sensor which measures the curvature by which the curvature sensor itself was bent. The curvature measured by the curvature sensor 150 indicates the curvature of the belt body 10 at the position where the curvature sensor 150 is disposed.
The flexible substrate 20 has six holes formed in the longitudinal direction of the flexible substrate 20. Hereinafter, the holes of the flexible substrate 20 are expressed as a substrate hole 21a, a substrate hole 21b,..., A substrate hole 21f in order from the tail side of the belt body 10. The substrate holes 21a to 12f are collectively referred to as the substrate hole 21.
The board hole 21a, the board hole 21b,..., And the board hole 21f respectively match the positions of the belt hole 12a, the belt hole 12b,..., And the belt hole 12f when the flexible board 20 is mounted on the belt body 10. It is vacated in the position to do.
Note that the arrangement of sensors in FIG. 2 is an example, and the present invention is not limited to this. For example, in FIG. 2, the first electrode is disposed on the tail side of the belt body 10, the curvature sensor 150 is disposed on the head side of the belt body 10, and the first electrode 121 and the curvature sensor 150 are disposed. And are separated. On the other hand, the 1st electrode 121 and the curvature sensor 150 may be arrange | positioned so that the arrangement | positioning area | region of the 1st electrode 121 and the arrangement | positioning area | region of the curvature sensor 150 may overlap over a part of the belt | band | zone part 11 or the whole. . Such an arrangement can be realized using a multilayer substrate technique or a technique of stacking a plurality of substrates.

FIG. 3 is an explanatory diagram showing an example of arrangement of sensors on the circuit board 30. As shown in the figure, the circuit board 30 is provided with a second electrode 131.
The circuit board 30 is provided with a connector 31. The connector 31 is a connector for electrically connecting the flexible board 20 and the circuit board 30.

FIG. 4 is an explanatory view showing an arrangement example of the circuit board 30. As described above, the flexible substrate 20 is disposed between the two skins of the belt portion 11. The circuit board 30 is stored in the decorative case 13.
The circuit board 30 is arranged with the connector 31 facing the buckle 15 side. The end of the flexible substrate 20 on the buckle 15 side is bent and connected to the connector 31. This is because the appearance of the belt body 10 is made to be the same as the appearance of a belt used for daily use.

  FIG. 5 is a schematic block diagram illustrating a functional configuration of the contour shape estimation apparatus 1. As shown in the figure, the contour shape estimation apparatus 1 includes a sensor unit 100 and a processing unit 200. The sensor unit 100 includes a first serial communication unit 110, a power supply unit 111, an electrode switching unit 112, a first electrode 121, a second electrode 131, an impedance index measurement unit 140, a curvature sensor 150, a physical sensor An action detection unit 160. The processing unit 200 includes a second serial communication unit 210, a start condition determination unit 220, a perimeter detection unit 230, and a contour shape estimation unit 240. The start condition determination unit 220 includes an impedance determination unit 221. The contour shape estimation unit 240 includes a partial shape estimation unit 241, a partial determination unit 242, and an entire circumference shape estimation unit 243.

Below, the case where each part of the contour shape estimation apparatus 1 is mounted on the belt body 10 will be described as an example. However, a part of the contour shape estimation device 1 may be configured as a device separate from the belt main body 10. For example, the processing unit 200 may be configured as a separate device from the belt body 10.
On the other hand, since each part of the contour shape estimation device 1 is mounted on the belt body 10, the user can use the contour shape estimation device 1 in the same manner as a daily belt, which is highly convenient for the user.

  The sensor unit 100 includes a sensor and measures the state of the belt body 10. Among the units of the sensor unit 100, the first serial communication unit 110, the electrode switching unit 112, the first electrode 121, the impedance index measurement unit 140, and the curvature sensor 150 are provided on the flexible substrate 20. On the other hand, the power supply unit 111, the second electrode 131, and the physical action detection unit 160 are provided on the circuit board 30. However, the power supply unit 111, the electrode switching unit 112, the impedance index measurement unit 140, and the physical action detection unit 160 may be provided on any side of the flexible substrate 20 and the circuit substrate 30.

The first serial communication unit 110 transmits each measurement value obtained by the sensor unit 100 to the processing unit 200 by serial communication. As will be described later, the first serial communication unit 110 may be configured by a plurality of communication circuits.
The power supply unit 111 includes a power source such as a button battery, and supplies power to each unit of the contour shape estimation apparatus 1. In particular, the power supply unit 111 supplies (applies) an AC voltage to the first electrode 121 and the second electrode 131. The power supply unit 111 supplies a DC voltage to the curvature sensor 150. The power supply unit 111 supplies a relatively high frequency AC voltage such as a frequency of 100 kilohertz (kHz) or more. Thereby, the electrostatic dielectric effect when the 1st electrode 121 and the 2nd electrode 131 oppose and function as a capacitor can be heightened.

The electrode switching unit 112 switches the first electrode 121 to which the voltage from the power supply unit 111 is applied in a time division manner when measuring (detecting) the circumference of the belt body 10.
A voltage from the power supply unit 111 is applied to the first electrode 121 and the second electrode 131. In particular, the voltage from the power supply unit 111 is applied to the first electrodes 121 a to 121 f via the electrode switching unit 112 in a time division manner. The impedance index measurement unit 140 measures an index value indicating the impedance between the first electrode 121 and the second electrode 131.

FIG. 6 is an explanatory diagram illustrating an example of a positional relationship between the first electrode 121 and the second electrode 131 in a state where the user wears the contour shape estimation apparatus 1 (belt body 10).
As shown in the figure, when the user wears the contour shape estimation device 1, the belt body 10 forms a ring. The contour shape estimation device 1 detects the circumference of the belt body 10 in this state as the circumference of the measurement target portion. Usually, the contour shape estimation apparatus 1 (belt body 10) is used by being wound around the user's abdomen. In this state, the contour shape estimation device 1 detects the perimeter of the user's abdomen (abdominal circumference).

Each of the first electrodes 121 is such that any one of the first electrodes 121 faces the second electrode 131 in a state where the user wears the contour shape estimation device 1 (belt body 10) (the first electrode 121 and the first electrode 121). The surface of the two electrodes 131 faces each other). Specifically, when the needle part 16 is passed through the belt hole 12a, the first electrode 121a and the second electrode 131 face each other. Similarly, when the needle part 16 is passed through the belt holes 12b, 12c, ..., 12f, the first electrodes 121b, 121c, ..., 121f and the second electrode 131 face each other.
FIG. 6 shows an example in which the needle portion 16 is passed through the belt hole 12b, and the first electrode 121b and the second electrode 131 are opposed to each other.

FIG. 7 is an explanatory diagram illustrating a configuration example of an electric circuit of a sensor that obtains the circumference of the belt body 10. As described above, one of the first electrodes 121 faces the second electrode 131 in a state where the user wears the belt main body 10. In FIG. 7, the first electrode 121 c and the second electrode 131 are opposed to each other.
The first electrode 121 facing the second electrode 131 and the first electrode 121 not facing the second electrode 131 have different impedances when an AC voltage is applied. Therefore, the electrode switching unit 112 switches the first electrode 121 in a time division manner and applies a voltage from the power supply unit 111.

Specifically, the electrode switching unit 112 includes first switches 113a to 113f. Hereinafter, the first switches 113a to 113f are collectively referred to as the first switch 113.
The first switches 113a, 113b,..., 113f are connected to the first electrodes 121a, 121b,. The electrode switching unit 112 switches the first switch 113 to be turned on in a time division manner, and turns on one of the first switches 113 to switch the first electrode 121 to which a voltage is applied in a time division manner.

Then, the impedance index measurement unit 140 measures an index value indicating the impedance between each of the first electrodes 121 and the second electrode 131.
FIG. 7 shows an example in which the impedance index measurement unit 140 measures an AC voltage between the first electrode 121 and the second electrode 131. In the first electrode 121 facing the second electrode 131, the first electrode 121 and the second electrode 131 function as a capacitor, and a circuit in which the second electrode 131 is connected to the power supply unit 111 and the first electrode 121. AC current flows through As a result, the voltage of the power supply unit 111 drops, and the voltage measured by the impedance index measurement unit 140 becomes relatively small (low).

On the other hand, in the first electrode 121 that is not opposed to the second electrode 131, almost no current flows through the circuit in which the power supply unit 111, the first electrode 121, and the second electrode 131 are connected. In this case, the voltage of the power supply unit 111 remains the open end voltage of the power supply unit 111, and the voltage measured by the impedance index measurement unit 140 is higher than the voltage at the first electrode 121 facing the second electrode 131. Become bigger (higher).
As described above, it is possible to determine which of the first electrodes 121 is opposed to the second electrode 131 based on the voltage measured by the impedance index measuring unit 140.

  However, the index value measured by the impedance index measuring unit 140 is not limited to a voltage, and may be any index value indicating impedance. For example, the impedance index measurement unit 140 may measure the current flowing through the first electrode 121 and the second electrode 131. In this case, the smaller the impedance between the first electrode 121 and the second electrode 131, the larger the current measured by the impedance index measuring unit 140. Thereby, it can be determined which of the first electrodes 121 faces the second electrode 131.

The physical action detector 160 detects a predetermined physical action on the belt body 10.
For example, the physical action detection unit 160 includes an acceleration sensor, and detects the motion of the contour shape estimation device 1 by detecting the acceleration of the contour shape estimation device 1 (belt body 10). When the user moves the contour shape estimation apparatus 1, force is applied to the contour shape estimation apparatus 1 to generate acceleration, and the physical action detection unit 160 detects this acceleration. The movement of the contour shape estimation apparatus 1 here is a physical movement such as moving, changing direction, changing inclination, and a combination thereof.

  The physical action detection unit 160 detecting a predetermined physical action (acceleration in the example of the acceleration sensor) is one of the conditions under which the contour shape estimation device 1 starts estimating the contour of the measurement target portion and detecting the surrounding length. Used as one. Specifically, the physical action detection unit 160 operates when a predetermined physical action is detected (trigger), and starts applying voltage to the first electrode 121 and the second electrode 131 in the power supply unit 111. Instruct. When the power supply unit 111 applies a voltage to the first electrode 121 and the second electrode 131, the electrode switching unit 112 switches the first electrode 121 to which the voltage is applied as described above. Then, the impedance index measurement unit 140 measures an index value indicating the impedance between each of the first electrodes 121 and the second electrode 131. Based on this index value, the start condition determination unit 220 determines whether to start detection of the perimeter of the measurement target portion and estimation of the contour shape.

  Alternatively, the physical action detection unit 160 is configured to include a switch that is turned on when the belt body 10 moves in addition to or instead of the acceleration sensor, and detects the presence or absence of movement of the contour shape estimation device 1. Also good. That is, the physical action detection unit 160 may detect whether or not the contour shape estimation apparatus 1 is accelerated.

FIG. 8 is an explanatory diagram showing an example of the structure of a switch that is turned on when the belt body 10 moves. As shown in the figure, the second switch 161 includes a third electrode 162, a weight 163, and a spring 164.
The third electrode 162 surrounds the entire circumference of the weight 163. In order to make the drawing easier to see, only a part of the third electrode 162 surrounding the entire circumference of the weight 163 is shown in FIG.
The weight 163 functions as a fourth electrode, and the second switch 161 is turned on when the third electrode 162 and the weight 163 come into contact with each other.
The spring 164 supports the weight 163.

  In a state where the contour shape estimation apparatus 1 (belt body 10) is stationary, the third electrode 162 and the weight 163 are not in contact with each other, and the second switch 161 is OFF. On the other hand, when the user moves the contour shape estimation apparatus 1, the weight 163 moves differently from the third electrode 162 due to inertial force. Thereby, the weight 163 is inclined from the position when the contour shape estimation apparatus 1 is stationary, and the third electrode 162 and the weight 163 come into contact with each other. As a result, the second switch 161 is turned ON.

For example, the physical action detection unit 160 operates when the second switch 161 is turned on, and instructs the power supply unit 111 to start applying voltages to the first electrode 121 and the second electrode 131. When the power supply unit 111 applies a voltage to the first electrode 121 and the second electrode 131, the electrode switching unit 112 switches the first electrode 121 to which the voltage is applied as described above. Then, the impedance index measurement unit 140 measures an index value indicating the impedance between each of the first electrodes 121 and the second electrode 131. Based on this index value, the start condition determination unit 220 determines whether to start detection of the perimeter of the measurement target portion and estimation of the contour shape.
Note that the shape of the weight 163 does not need to be the cylindrical shape shown in FIG. 8, and can be various shapes. Further, the third electrode 162 does not need to be disposed on the entire circumference of the weight 163, and may be disposed so as to be in contact with the third electrode 162 even if the weight 163 is inclined in any direction.

Alternatively, the physical action detection unit 160 may detect a pressure on a predetermined portion of the belt main body 10 in addition to or instead of detecting the movement of the belt main body 10.
FIG. 9 is an explanatory diagram illustrating an example of the arrangement of switches that detect pressing on a predetermined portion of the belt main body 10. As shown in the figure, the third switch 165 is disposed on the outer surface of the decorative case 13 so as to be located inside the ring 14.

  In a state where the band 11 is not passed through the ring 14, the third switch 165 is OFF. On the other hand, when the user wears the contour shape estimation device 1 (belt main body 10) and passes the belt portion 11 through the ring 14, the third switch 165 is pushed by the belt portion 11 and is turned on. When the third switch 165 is turned on, the physical action detection unit 160 detects the pressing on the cosmetic case 13 by the band 11 sandwiched between the ring 14 and the decorative case 13.

For example, as in the case of the second switch 161 (FIG. 8), the physical action detection unit 160 operates when the third switch 165 is turned on, and the first electrode 121 and the second electrode are connected to the power supply unit 111. Instruct to start application of voltage to 131.
Further, for example, the third switch 165 may be provided in a wiring (power wiring) that connects the power supply unit 111 and the electrode switching unit 112. As a result, the electrode switching unit 112 applies a voltage from the power supply unit 111 to any one of the first electrodes 121 when the user wears the contour shape estimation device 1 and passes through the belt unit 11 and the ring 14. When the electrode switching unit 112 applies a voltage to any of the first electrodes 121, the impedance index measurement unit 140 measures an index value indicating the impedance between each of the first electrodes 121 and the second electrode 131. Based on this index value, the start condition determination unit 220 determines whether to start detection of the perimeter of the measurement target portion and estimation of the contour shape.

The curvature sensor 150 measures the curvature of the belt body 10 at the position where the curvature sensor 150 is disposed.
FIG. 10 is an explanatory diagram illustrating a configuration example of the curvature sensor 150. As shown in the figure, the curvature sensor 150 includes a bridge (Wheatstone bridge) 151 in which resistors 152-1 and 152-2 and strain gauges 153-1 and 153-2 are combined, and an amplifier 156. The The bridge 151 receives a DC voltage from the power supply unit 111 when measuring the curvature. The current from the power supply unit 111 flows through the bridge 151 to the ground (zero potential point).

The output of the curvature sensor 150 is transmitted to the circuit board 30 via the A / D converter (analog-digital converter) 157 and the serial communication circuit 114. The circuit board 30 executes the function of the processing unit 200, and the serial communication circuit 114 transmits the measurement result (sensor value) of the curvature sensor 150 to the processing unit 200.
Hereinafter, the resistors 152-1 and 152-2 are collectively referred to as a resistor 152. Further, the strain gauges 153-1 and 153-2 are collectively referred to as a strain gauge 153.

FIG. 11 is an explanatory diagram showing an arrangement example of the strain gauges 153. This figure shows an example of a cross section of the belt body 10 as viewed from the side, and an arrow B11 indicates the longitudinal direction of the belt body 10.
All of the strain gauges 153 are arranged so that the direction in which the strain (strain) is detected coincides with the longitudinal direction of the belt body 10. In addition, as shown in FIG. 11, the strain gauges 153-1 and 152-2 are arranged with the flexible substrate 20 interposed therebetween. For example, the strain gauge 153-1 is disposed on the front surface side of the belt body 10 when viewed from the flexible substrate 20, and the strain gauge 153-2 is disposed on the back surface side of the belt body 10 when viewed from the flexible substrate 20.

  With this arrangement, when the flexible substrate 20 is bent, a difference is generated between the impedance of the strain gauge 153-1 and the impedance of the strain gauge 153-2. When the user wears the contour shape estimation device 1 (belt main body 10) and the flexible substrate 20 is bent convexly on the front surface side of the belt main body 10 and concavely bent on the back surface side, the distortion disposed on the front surface side of the belt main body 10 The gauge 153-1 extends to increase the impedance. On the other hand, the strain gauge 153-2 disposed on the back side of the belt main body 10 is contracted to reduce the impedance.

Due to the difference in impedance, a voltage (potential difference) is generated between the points P11 and P12. The magnitude of the voltage between the point P11 and the point P12 indicates the magnitude of the bending of the belt body 10 at the installation position of the strain gauge 153 (the installation position of the curvature sensor 150).
The amplifier 156 converts the voltage between the point P11 and the point P12 into the curvature of the belt body 10 at the installation position of the strain gauge 153. Specifically, a calibration curve indicating the relationship between the voltage between the points P11 and P12 and the curvature of the belt body 10 is obtained in advance, and the amplifier 156 calculates the voltage between the points P11 and P12. It is set to amplify according to this calibration curve.

Note that the bridge 151 may include only one strain gauge 153. Specifically, the bridge 151 may include a resistor instead of one of the strain gauges 153-1 and 153-2. As the resistance in this case, a resistance having the same resistance value as that when the strain gauge 153 is not bent is used.
On the other hand, when the bridge 151 includes one strain gauge 153 as shown in FIG. 10, the voltage difference between the point P11 and the point P12 becomes larger than the case where the bridge 151 includes only one strain gauge 153, and the curvature is increased. The accuracy of the sensor 150 is improved. In addition, since the bridge 151 includes one strain gauge 153, the bridge 151 is less affected by temperature changes than when the bridge 151 includes only one strain gauge 153.

Note that the wiring in the strain gauge 153 is thinned and the wiring connected to the strain gauge 153 is thickened. Thereby, the accuracy of the curvature sensor 150 can be improved. This point will be described with reference to FIG.
FIG. 12 is an explanatory diagram showing a comparative example of the thickness of a line connected to the strain gauge 153 and a line in the strain gauge 153. In the drawing, a wiring W11 in the strain gauge 153 and a wiring W12 connected to the strain gauge 153 are shown.

When the strain gauge 153 is bent, the impedance of the strain gauge 153 is changed by changing the length and / or width of the wiring W11. The strain gauge 153 indicates the magnitude of bending by this change in impedance.
In order to easily change the impedance of the strain gauge 153, the width of the wiring W11 is narrowed (the wiring W11 is narrowed). As a result, when the strain gauge 153 is bent and the width of the wiring W11 changes, the rate of change from the original width increases.

On the other hand, in order to accurately measure the impedance of the strain gauge 153, it is preferable that the resistance between the strain gauge 153 and the impedance detection circuit (the amplifier 156 in the example of FIG. 10) is small. Therefore, the width of the wiring W12 is increased (the wiring W12 is thickened).
In this way, the accuracy of the curvature sensor 150 can be improved by thinning the wiring in the strain gauge 153 and thickening the wiring connected to the strain gauge 153.

The A / D converter 157 converts an analog signal (for example, a voltage value proportional to the curvature) output from the amplifier 156 into a digital signal.
The serial communication circuit 114 transmits the digital signal output from the A / D converter 157 to the circuit board 30 by serial communication. As a result, the serial communication circuit 114 transmits the digital signal output from the A / D converter 157 to the processing unit 200. For example, the serial communication circuit 114 is provided for each curvature sensor 150, and the first serial communication unit 110 includes the serial communication circuit 114.

As a communication method of the serial communication circuit 114, for example, various serial communication methods such as SPI (Serial Peripheral Interface) or I2C (Inter-Integrated Circuit) (I2C is a registered trademark) can be used.
When the serial communication circuit 114 performs serial communication, the sensor value by the curvature sensor 150 can be communicated with a small number of wires, such as about 3 to 5. By eliminating the need for a large number of wires, it is possible to avoid an increase in the size of the belt body 10 such that the belt portion 11 becomes wider or thicker.

Hereinafter, a combination of the amplifier 156, the A / D converter 157, and the serial communication circuit 114 is referred to as a signal conversion module 181. The signal conversion module 181 converts an analog signal (voltage between the points P11 and P12) by the bridge 151 into a digital signal indicating a curvature, and further converts it into a digital signal according to the serial communication standard.
Here, the signal conversion module 181 is configured as a single chip, or the signal conversion module 181 is configured as a single substrate. This eliminates the need to design the signal conversion module 181 for each curvature sensor 150 (the bridge 151 of the curvature sensor 150). In this respect, the signal conversion module 181 can be arranged relatively easily when designing the contour shape estimation apparatus 1.

Note that one signal conversion module 181 may transmit the curvature of the plurality of bridges 151.
FIG. 13 is an explanatory diagram showing a connection example in which the bridge 151 and the signal conversion module 181 are connected in a many-to-one relationship. In the example of FIG. 4, the four bridges 151 are connected to the signal conversion module via the multiplexer 182.

  The multiplexer 182 switches the bridge 151 connected to the signal conversion module 181 in a time division manner. The signal conversion module 181 converts the voltage of the bridge 151 connected via the multiplexer 182 (the voltage between the point P11 and the point P12 in FIG. 10) into a digital signal indicating the curvature and transmits the digital signal by serial communication. To do. Thereby, a curvature can be transmitted by a relatively small number of signal conversion modules.

  On the other hand, when the bridge 151 and the signal conversion module are arranged one-on-one, the signal conversion module 181 is arranged near the bridge 151. Thereby, it is possible to prevent a decrease in the S / N ratio (Signal To Noise Ratio) of the signal (voltage in the bridge 151) acquired by the signal conversion module 181. In this respect, the curvature sensor 150 can measure the curvature with high accuracy.

  Further, when the bridge 151 and the signal conversion module 181 are arranged one-on-one, the length of the wiring between the bridge 151 and the signal conversion module 181 is the same in any combination of the bridge 151 and the signal conversion module 181. Align. Thereby, the dispersion | variation in the measurement precision of the curvature for every combination of the bridge 151 and the signal conversion module 181 can be reduced.

  The processing unit 200 detects the perimeter of the measurement target portion using the measurement result of the sensor unit 100, and estimates the contour shape. Each part of the processing unit 200 is provided on the circuit board 30. For example, the second serial communication unit 210 is realized by a serial communication circuit included in the sensor unit 100. The start condition determination unit 220, the perimeter detection unit 230, and the contour shape estimation unit 240 are programmed by a CPU (Central Processing Unit) included in the circuit board 30 from a storage device included in the circuit board 30. This is realized by reading and executing.

The second serial communication unit 210 communicates with the first serial communication unit 110 by serial communication. In particular, the second serial communication unit 210 receives various data transmitted by the first serial communication unit 110 such as a curvature measurement value.
The start condition determination unit 220 determines whether to start the detection of the perimeter of the measurement target portion and the estimation of the contour shape. Specifically, the start condition determination unit 220 determines whether or not a start condition for detecting the circumference of the measurement target portion and estimating the contour shape is satisfied. This starting condition is that the physical action detection unit 160 detects a predetermined physical action, and there is the first electrode 121 whose impedance with the second electrode 131 is equal to or lower than the predetermined impedance.

Here, as described above, when the physical action detection unit 160 detects a predetermined physical action, the impedance index measurement unit 140 is connected between each of the first electrodes 121 and the second electrode 131. An index value indicating impedance is measured. Therefore, the start condition determination unit 220 acquires the index value measured by the impedance index measurement unit 140, and based on this index value, the impedance of the first electrode 121 with the second electrode 131 is equal to or lower than a predetermined impedance. When it is determined that the first electrode 121 is present, it is determined that the start condition is satisfied.
By determining that the start condition is satisfied, the start condition determining unit 220 determines to start detection of the perimeter of the measurement target portion and estimation of the contour shape.

  Based on the index value measured by the impedance index measurement unit 140, the impedance determination unit 221 determines the presence or absence of the first electrode 121 whose impedance with the second electrode 131 is equal to or lower than a predetermined impedance among the first electrodes 121. To do. For example, when the impedance index measurement unit 140 measures the voltage between the first electrode 121 and the second electrode 131 as an index value indicating impedance as in the example of FIG. 7, the impedance determination unit 221 has a predetermined voltage or less. The presence or absence of the first electrode 121 is determined.

  The perimeter detection unit 230 detects the perimeter of the measurement target portion based on the impedance between the first electrode 121 and the second electrode 131. Here, since the distance between the buckle 15 and each of the belt holes 12 is known in advance, if the belt hole 12 through which the needle portion 16 passes is known, the circumferential length of the belt body 10 can be obtained. The circumferential length of the belt body 10 can be regarded as the circumferential length of the measurement handling portion.

FIG. 14 is an explanatory diagram showing a first example of the relationship between the impedance between the first electrode 121 and the second electrode 131 and the circumferential length of the belt body 10. The horizontal axis of the graph shown in the figure indicates the circumference of the first electrode and the belt body 10. The vertical axis represents the impedance between the first electrode 121 and the second electrode 131.
In FIG. 14, the circumferential lengths of the belt body 10 when the needle portion 16 passes through the belt holes 12a, 21b, 21c, 21d, 21e, and 21f are respectively “a”, “b”, “c”, and “d”. ”,“ E ”, and“ f ”.

  As described above, when the needle portion 16 is passed through the belt hole 12a, the first electrode 121a and the second electrode 131 face each other. Similarly, when the needle part 16 is passed through the belt holes 12a, 12b, ..., 12f, the first electrodes 121a, 121b, ..., 121f and the second electrode 131 face each other. Therefore, the belt hole 12 through which the needle portion 16 passes can be specified based on the impedance between the first electrode 121 and the second electrode 131. By specifying the belt hole 12 through which the needle portion 16 passes, the circumferential length of the belt main body 10 can be detected.

  In the example of FIG. 14, the impedance between the first electrode 121c and the second electrode 131 is small. As a result, the belt hole 12 through which the needle portion 16 passes can be specified as the belt hole 12c. By specifying the belt hole 12 through which the needle portion 16 passes as the belt hole 12c, the circumferential length “c” of the belt main body 10 can be detected.

Therefore, the perimeter detection unit 230 stores in advance the perimeter when the needle portion 16 passes through the belt hole 12 for each belt hole 12.
Then, the perimeter detection unit 230 specifies the belt hole 12 through which the needle unit 16 passes based on the impedance between the first electrode 121 and the second electrode 131. For example, when the impedance index measurement unit 140 measures the voltage between the first electrode 121 and the second electrode 131 as an index value indicating impedance as in the example of FIG. 7, the impedance determination unit 221 includes the impedance index measurement unit. The belt hole 12 having the smallest measured voltage 140 is identified.
Then, the perimeter detection unit 230 reads the perimeter stored with respect to the identified belt hole 12 to detect the perimeter of the measurement target portion.

  The perimeter detection unit 230 performs processing for detecting the perimeter of the measurement target portion when the start condition determination unit 220 determines to start detection of the perimeter of the measurement target portion and estimation of the contour shape. Thereby, in the perimeter detection unit 230, the physical action detection unit 160 detects a predetermined physical action, and the impedance determination unit 221 has an impedance with the second electrode 131 equal to or lower than the predetermined impedance. When it is determined that the first electrode 121 is present, the perimeter of the measurement target portion is detected.

The belt body 10 is not limited to a belt of a type in which a needle portion is passed through a hole in the belt. For example, the belt body 10 may be a belt that can adjust the circumference of the belt body 10 steplessly, such as a type in which the belt body 10 is fixed with a buckle sandwiched between bands.
FIG. 15 is an explanatory diagram illustrating a second example of the relationship between the impedance between the first electrode 121 and the second electrode 131 and the circumferential length of the belt body 10. The horizontal axis of the graph shown in the figure indicates the circumference of the first electrode and the belt body 10. The vertical axis represents the impedance between the first electrode 121 and the second electrode 131.

  In FIG. 15, the circumferential length of the belt hole 12 when the second electrode 131 just faces the first electrode 121 a is indicated by “a”. Similarly, the circumferential lengths of the belt holes 12 when the second electrode 131 is just facing the first electrodes 121b, 121c, 121d, 121e, and 121f are “b”, “c”, “d”, “ e ”and“ f ”.

In the example of FIG. 15, the impedance between the first electrode 121c and the second electrode 131 and the impedance between the first electrode 121d and the second electrode 131 are small. The magnitude of impedance between the first electrode 121c and the second electrode 131 is substantially the same as the magnitude of impedance between the first electrode 121d and the second electrode 131. In this case, it is considered that the second electrode 131 is at a position facing the middle between the first electrode 121c and the first electrode 121d.
Therefore, the perimeter detection unit 230 calculates the perimeter of the belt body 10 (“P21” in FIG. 15) by averaging the perimeter c and the perimeter d as shown in Equation (1), and the calculated length. Is detected as the perimeter of the portion to be measured.

  FIG. 16 is an explanatory diagram illustrating a third example of the relationship between the impedance between the first electrode 121 and the second electrode 131 and the circumferential length of the belt body 10. The horizontal axis of the graph shown in the figure indicates the circumference of the first electrode and the belt body 10. The vertical axis represents the impedance between the first electrode 121 and the second electrode 131.

  As in the case of FIG. 15, in FIG. 16, the circumferential length of the belt hole 12 when the second electrode 131 just faces the first electrode 121a is indicated by “a”. Similarly, the circumferential lengths of the belt holes 12 when the second electrode 131 is just facing the first electrodes 121b, 121c, 121d, 121e, and 121f are “b”, “c”, “d”, “ e ”and“ f ”.

In the example of FIG. 16, the impedance between the first electrode 121c and the second electrode 131 and the impedance between the first electrode 121d and the second electrode 131 are small. The impedance between the first electrode 121d and the second electrode 131 is smaller than the impedance between the first electrode 121c and the second electrode 131. In this case, it is considered that the second electrode 131 is closer to the first electrode 121d than the first electrode 121c.
Therefore, the perimeter detection unit 230 calculates the perimeter of the belt body 10 (“P22” in FIG. 16) by weighting and averaging the perimeter c and the perimeter d as shown in Equation (2), and the calculated length. Is detected as the perimeter of the portion to be measured.

Here, as shown in FIG. 16, “α ₁ ” is calculated based on the impedance between the first electrode 121 and the second electrode 131 when the second electrode 131 is sufficiently separated from the first electrode 121. A difference (α ₁ ≧ 0) obtained by subtracting the impedance between the electrode 121c and the second electrode 131. Further, “α ₂ ” is the first electrode 121 d and the second electrode 131 from the impedance between the first electrode 121 and the second electrode 131 when the second electrode 131 is sufficiently separated from the first electrode 121. The difference obtained by subtracting the impedance between and (α ₂ ≧ 0).

  The contour shape estimation unit 240 is a first electrode in which the physical action detection unit 160 detects a predetermined physical action, and the impedance determination unit 221 has an impedance with the second electrode 131 equal to or lower than the predetermined impedance. When it is determined that there is 121, the contour shape of the measurement target portion is estimated based on the sensor value of the curvature sensor 150. Specifically, the contour shape estimation unit 240 is based on the sensor value of the curvature sensor 150 when the start condition determination unit 220 determines to start detecting the circumference of the measurement target portion and estimating the contour shape. Thus, the contour shape of the measurement target portion is estimated.

The partial shape estimation unit 241 estimates a partial shape, which is a partial shape, of the entire contour of the measurement target portion based on the sensor value of the curvature sensor 150 (the curvature detected by the curvature sensor 150).
Here, the shape estimation process performed by the partial shape estimation unit 241 will be described with reference to FIGS.

  FIG. 17 is an explanatory diagram illustrating an example of the shape of a portion of the belt main body 10. The figure shows a state where the flexible substrate 20 and a plurality of curvature sensors 150 provided on the flexible substrate 20 are bent. The partial shape of the flexible substrate 20 can be regarded as the partial shape of the belt main body 10 (the partial shape of the belt portion 11). Here, the curvature sensor 150 is distinguished by being expressed as a curvature sensor 150-1, a curvature sensor 150-2, a curvature sensor 150-3,.

In the example of FIG. 17, the curvature sensors 150 are arranged at equal intervals (interval of distance d). A range of distance d is assumed with each of the curvature sensors 150 as the center, and ends of these ranges are indicated by points P ₀ , P ₁ , P ₂ , P ₃ ,. The partial shape estimation unit 241 obtains a partial shape by approximating each of these ranges with an arc of curvature indicated by the curvature sensor 150.
Also, _{C 1} is the curvature of the curvature sensor 150-1, the curvature of the curvature sensors 150-2 _{C 2,} the curvature of the curvature sensor 150-3 is assumed to be _{C 3.}

FIG. 18 is a first diagram illustrating a partial shape estimation process performed by the partial shape estimation unit 241.
FIG. 18 shows a curvature sensor 150-1, one end (point P ₀ ) and the other end (point P ₁ ) of a range of distance d around the curvature sensor 150-1 in the coordinate system with the origin O as a reference. ). The value of the distance d is a known value, partial shape estimation unit 241 obtains a curvature C _1, which curvature sensor 150a measures. The partial shape estimation unit 241 calculates the curvature radius R ₁ from the curvature C ₁ based on the equation (3).

Here, C indicates the curvature, and R indicates the curvature radius.
Based on the curvature radius R ₁ and the curvature C ₁ , the partial shape estimation unit 241 determines the center angle of the arc that approximates the range of the distance d centering on the curvature sensor 150-1 (the center of the fan shape having this arc). (Angle) θ ₁ is calculated by Equation (4).

Here, θ represents the central angle, and C represents the curvature. The distance d indicates the length of the arc.
The fan-shaped center point is referred to as O ₁ . The partial shape estimation unit 241 uses the coordinates of the fan-shaped center point O ₁ , the coordinates of the point P ₀ , and the center angle θ ₁ to calculate the distance d centered on the curvature sensor 150-1 using Equation (5). The coordinates of the end point P _{1 which} is different from the range point P ₀ are calculated.

Here, P ₀ , P ₁ , and O ₁ indicate the coordinates of the point P ₀ , the point P ₁ , and the center point O ₁ with vertical vectors, respectively.
The coordinates of the fan-shaped center point O ₁ can be calculated from the origin O of the coordinate system, the point P _0, and the value of the curvature radius R ₁ . A center point of an arc that approximates a range of a distance d centering on the curvature sensor 150- (i + 1) adjacent to the curvature sensor 150-i (i is an integer of i ≧ 0) (a sector-shaped center point having this arc) ) The coordinates of O _{i + 1} can be calculated by equation (6).

Here, O _{i + 1} , P _i , and O _i indicate the coordinates of the center point O _{i + 1} , the point P _i , and the center point O _i by vertical vectors, respectively. R _i and R _{i + 1} are radii of curvature determined by the equations (3) from the curvatures C _i and C _{i + 1} , respectively.
When the point at one end of the arc that approximates the range of the distance d centering on the curvature sensor 150-i is P _i , the point P _{i + 1 at} the other end of the arc can be calculated by Equation (7).

Here, P _i-1 indicates the coordinates of the point P _i-1 as a vertical vector. In addition, θ _i indicates a central angle of a circular arc that approximates a range of a distance d centering on the curvature sensor 150-i (a central angle of a fan shape having this circular arc).

FIG. 19 is a second diagram illustrating the partial shape estimation process performed by the partial shape estimation unit 241.
FIG. 19 shows an example when the process shown in FIG. 18 is repeated. As described above, partial shape estimation unit 241, based on the curvature the curvature sensor 0.99-i was measured C _i and the distance d (the length of the arc), the coordinates of the point P _i from the point P _i-1 of the coordinates Can be calculated. In the initial processing of partial shape estimation, the point P ₀ may be coordinates arbitrarily set in the coordinate system. The partial shape estimation unit 241 sequentially calculates the coordinates of the points P ₁ , P ₂ , P ₃ ,. Thereby, the partial shape estimation unit 241 estimates the shape of the portion of the belt body 10 where the curvature sensor 150 is disposed (including the portion between the curvature sensor 150 and the curvature sensor 150) by approximating with a continuous arc. be able to.

The part determination unit 242 determines which part of the whole circumference contour of the measurement target part the part shape estimated by the part shape estimation unit 241 is based on the perimeter detected by the perimeter detection unit 230. In particular, the partial determination unit 242 estimates the central position on the abdomen side and the central position on the back side with respect to the partial shape estimated by the partial shape estimation unit 241.
Several methods can be used as a method by which the partial determination unit 242 estimates the center position on the abdomen side and the center position on the back side.

  For example, the part determination unit 242 estimates a predetermined position of the buckle 15 (for example, the position of the boundary between the buckle 15 and the decorative case 13 as the center position on the abdomen side. Then, the part determination unit 242 A position that is advanced from the estimated position of the center by half of the peripheral length (that is, a position opposite to the estimated position of the abdominal side center) is estimated as the center position on the back side.

  FIG. 20 is an explanatory diagram illustrating an example of a position estimated by the partial determination unit 242. In the figure, the partial shape estimated by the partial shape estimation unit 241 is indicated by a solid line, and the remaining part (the part other than the part where the partial shape estimation unit 241 estimated the shape) of the entire circumference of the measurement target portion is indicated by a broken line. It shows. The position estimated by the partial determination unit 242 as the center position on the back side is indicated by a point P31, and the position estimated as the center position on the abdomen side is indicated by a point P32.

  In the example of FIG. 20, the curvature sensor 150 is not provided in the portion of the belt body 10 where the decorative case 13 is present. For this reason, the partial shape estimation unit 241 does not estimate the shape in the vicinity of the point P32 (center position on the abdomen side). However, since the distance from the position of the boundary between the buckle 15 and the decorative case 13 to the curvature sensor 150 is known, the buckle 15 can estimate the point P31 (center position on the back side). In the example of FIG. 20, the curvature sensor 150 is disposed over half or more of the length of the belt main body 10, and the partial shape estimation unit 241 estimates the partial shape for a range of half or more of the contour of the measurement target portion. . Thereby, the partial determination unit 242 estimates the point P31 at a position within the range where the partial shape estimation unit 241 estimates the partial shape.

Alternatively, the partial determination unit 242 may estimate the center position on the back side within a range where the curvature is minimized. For example, the partial determination unit 242 extracts a curvature equal to or less than a predetermined threshold from the curvatures measured by the curvature sensor 150. Then, the partial determination unit 242 includes a range corresponding to the extracted curvature in the range in which the partial shape estimation unit 241 estimates the partial shape (a range in which the partial shape estimation unit 241 approximates the contour shape based on the curvature). ) Is estimated as the back range. Then, the partial determination unit 242 estimates the estimated center position of the back range as the center position on the back side (point P31 in FIG. 20).
The partial determination unit 242 estimates a position advanced by half the circumference from the estimated center position on the back side as the center position on the abdomen side.

Based on the determination result of the partial determination unit 242 and the assumption that the contour shape of the entire circumference of the target portion is axisymmetric, the all-round shape estimation unit 243 determines the contour shape of the entire circumference of the measurement target portion from the partial shape. Is estimated.
Specifically, the all-round shape estimation unit 243 divides the partial shape estimated by the partial shape estimation unit 241 into two at the center position on the back side estimated by the partial determination unit 242, and determines the wider range. Extract as a partial shape to be replicated. In the example of FIG. 2, the omnidirectional shape estimation unit 243 extracts a partial shape in a thick line range as a partial shape to be copied.
Then, the all-around shape estimation unit 243 duplicates the extracted partial shape by horizontally inverting (that is, making it line-symmetric).

FIG. 21 is an explanatory diagram illustrating an example of a partial shape duplicated by the all-round shape estimation unit 243. In the example of the figure, the omnidirectional shape estimation unit 243 duplicates the partial shape in the range from the point P31 to the point P32 extracted as the partial shape to be duplicated symmetrically, and the range from the point P33 to the point P34. The partial shape is acquired.
The all-around shape estimation unit 243 connects the partial shape obtained by duplication and the original partial shape. At that time, since the shape of the portion corresponding to the buckle 15 (in the example of FIG. 21, the portion of the region A11 and the portion of the region A12) is unknown, there is a degree of freedom in the joining method. Accordingly, the entire shape estimation unit 243 obtains the duplication source partial shape and the duplication so that the points P31 and P33 are joined and the joined portion is smooth (the angle at the local part is 180 degrees). Connect the shape of the part.

FIG. 22 is an explanatory diagram illustrating an example in which a partial shape of a replication source and a partial shape obtained by replication are connected. In the figure, the point P31 and the point P33 are connected. In addition, the joined parts are smooth. Specifically, the angle at the joined local area is 180 degrees so that the tangent line L41 is uniquely determined.
The all-around shape estimation unit 243 supplements the shape of the portion corresponding to the buckle 15 and estimates the contour shape of the entire measurement target portion.
The all-around shape estimation unit 243 may approximate and interpolate a portion corresponding to the buckle 15 with a straight line. Alternatively, the entire shape estimation unit 243 may approximate and interpolate with a graphic other than a straight line, for example, by approximating a portion corresponding to the buckle 15 with an arc.

  Alternatively, the all-round shape estimation unit 243 may estimate the shape of the portion corresponding to the buckle 15 and determine the position of the point P32 with respect to the point P31 and the position of the point P34 with respect to the point P33. In this case, the all-around shape estimation unit 243 joins the point P31 and the point P33, joins the point P32 and the point P34, and joins the original partial shape and the partial shape obtained by the duplication. .

Next, the operation of the contour shape estimation apparatus 1 will be described with reference to FIGS.
FIG. 23 is an explanatory diagram illustrating an example of a processing procedure in which the contour shape estimation apparatus 1 detects the perimeter of the measurement target portion and estimates the contour shape.
In the process of FIG. 8, when detecting a predetermined physical action (sequence S101), the physical action detecting unit 160 outputs a notification that the physical action is detected to the impedance index measuring part 140 (sequence S102).
The impedance index measurement unit 140 that has received the notification from the physical action detection unit 160 measures the index value indicating the impedance between each of the first electrodes 121 and the second electrode 131 (sequence S103), and is obtained. The index value is output to start condition determination unit 220 (sequence S104).

Based on the index value acquired from the impedance index measuring unit 140, the start condition determining unit 220 determines whether or not the start condition for detecting the circumference of the measurement target portion and estimating the contour shape is satisfied (sequence S111). . Thereby, the start condition determination unit 220 determines whether to start the detection of the perimeter of the measurement target portion and the estimation of the contour shape. In the example of FIG. 23, the start condition determination unit 220 determines to start the detection of the perimeter of the measurement target portion and the estimation of the contour shape.
Note that if the start condition determination unit 220 determines not to start the detection of the perimeter of the measurement target and the estimation of the contour shape, the processing in FIG. 23 ends.

The start condition determination unit 220 that has decided to start the detection of the perimeter of the measurement target portion and the estimation of the contour shape outputs (transfers) the index value acquired in sequence S104 to the perimeter detection unit 230 (sequence S112). .
The perimeter detection unit 230 detects the perimeter of the measurement target portion based on the acquired index value (sequence S121). Then, the perimeter detection unit 230 outputs the detected perimeter to the contour shape estimation unit 240 (sequence S122).

  In addition, the start condition determination unit 220 that has decided to start the detection of the perimeter of the measurement target portion and the estimation of the contour shape in sequence S111 controls the sensor unit 100 to cause the curvature sensor 150 to measure the curvature. (Sequence S113). In particular, the start condition determination unit 220 controls the power supply unit 111 to supply power to each of the curvature sensors 150.

Each of the curvature sensors 150 measures the curvature (sequence S131). The obtained curvature is output to contour shape estimation unit 240 (sequence S132).
The contour shape estimation unit 240 estimates the contour shape of the measurement target portion based on the perimeter obtained in sequence S122 and the curvature obtained in sequence S132 (sequence S141).

FIG. 24 is a flowchart illustrating an example of a processing procedure in which the contour shape estimation unit 240 estimates the contour shape of the measurement target portion. The contour shape estimation unit 240 performs the process of FIG. 24 in the sequence S141 of FIG.
In the process of FIG. 24, the partial shape estimation unit 241 of the contour shape estimation unit 240 estimates the partial shape of the measurement coping portion (step S201).
Next, the part determination part 242 determines the part used for estimation of the whole outline shape among the partial shapes estimated by the partial shape estimation part 241 in step S201 (step S202).

Next, the all-around shape estimation unit 243 duplicates the part determined by the part determination unit 242 out of the partial shapes estimated by the partial shape estimation unit 241 (Step S203).
Then, the all-round shape estimation unit 243 connects the partial shape of the original and the partial shape obtained by the duplication (Step S204).
Then, the entire shape estimation unit 243 interpolates a portion that is insufficient with respect to the contour shape obtained in step S204 (step S205). Thereby, the perimeter shape estimation part 243 estimates the whole shape of the outline of a measurement object part.

As described above, the physical action detection unit 160 detects a predetermined physical action on the belt body 10.
Moreover, the impedance determination part 221 determines the presence or absence of the 1st electrode 121 whose impedance with the 2nd electrode 131 is below predetermined impedance among the 1st electrodes 121. FIG.
In the contour shape estimation unit 240, the physical action detection unit 160 detects a predetermined physical action, and the impedance determination unit 221 determines that the impedance with the second electrode 131 is equal to or lower than the predetermined impedance. When it is determined that there is one electrode 121, the contour shape of the measurement target portion is estimated based on the sensor value of the curvature sensor 150.
Accordingly, the contour shape estimation device 1 determines whether or not the belt main body 10 is wound (whether or not the needle portion 16 is in a state of passing through one of the belt holes 12), and the belt main body 10 is wound. If it is determined that it is not, subsequent processing can be suppressed. Thereby, the power consumption of the contour shape estimation apparatus 1 can be suppressed.

  The physical action detector 160 detects the movement of the belt body 10. Thereby, the contour shape estimation apparatus 1 can determine whether or not to perform estimation of the contour shape of the peripheral length of the measurement target portion when the user moves to wear the belt. When the user is not moving the belt, the processing of the contour shape estimation device 1 is suppressed, and the power consumption of the contour shape estimation device 1 can be suppressed in this respect.

  Alternatively, the physical action detection unit 160 detects a pressure on a predetermined portion of the belt body 10. Thereby, the contour shape estimation apparatus 1 can detect a state in which a predetermined portion is pressed by the user wearing the belt body 10 such as when the user passes a belt through the buckle 15. When the pressing to the predetermined portion is not detected, the processing of the contour shape estimation device 1 is suppressed, and the power consumption of the contour shape estimation device 1 can be suppressed in this respect.

The perimeter detection unit 230 detects the perimeter of the measurement target portion based on the impedance between the first electrode 121 and the second electrode 131.
Thereby, in the contour shape estimation apparatus 1, it is possible to determine whether or not to estimate the contour shape of the circumference of the measurement target portion using the first electrode 121 and the second electrode 131 for detecting the circumference. . The configuration of the contour shape estimation apparatus 1 can be simplified in that it is not necessary to provide a separate electrode in order to determine whether or not to estimate the contour shape of the circumference of the measurement target portion.

In addition, the perimeter detection unit 230 is configured such that the physical action detection unit 160 detects a predetermined physical action, and the impedance determination unit 221 has a second impedance that is less than or equal to a predetermined impedance. When it is determined that there is one electrode 121, the perimeter of the measurement target portion is detected.
Thereby, the contour shape estimation device 1 determines whether or not the belt main body 10 is wound (whether or not the needle portion 16 is in a state where it passes through any one of the belt holes 12). If it is determined that the winding is not wound, detection of the perimeter of the measurement target portion can be suppressed in addition to the estimation of the contour shape of the measurement target portion. Thereby, the power consumption of the contour shape estimation apparatus 1 can be further suppressed.

Further, the partial shape estimation unit 241 estimates a partial shape, which is a partial shape, of the entire circumference of the measurement target portion based on the sensor value of the curvature sensor 150.
The partial determination unit 242 determines, based on the peripheral length, which part of the entire contour of the measurement target portion is the partial shape estimated by the partial shape estimation unit 241.
Then, based on the determination result of the partial determination unit 242 and the assumption that the contour shape of the entire circumference of the target portion is axisymmetric, the all-round shape estimation unit 243 calculates the entire circumference of the measurement target portion from the partial shape. Estimate the contour shape.
Thereby, the contour shape estimation apparatus 1 can estimate the contour shape of the entire circumference of the measurement target portion even if the curvature sensor 150 is not arranged over the entire belt portion 11. In this respect, the number of curvature sensors 150 can be reduced, and the configuration of the contour shape estimation apparatus 1 can be relatively simplified.

<Second Embodiment>
FIG. 25 is a schematic block diagram illustrating a functional configuration of the contour shape estimation apparatus according to the second embodiment of the present invention. As shown in the figure, the contour shape estimation apparatus 2 includes a sensor unit 101 and a processing unit 200. The sensor unit 101 includes a first serial communication unit 110, a power supply unit 111, an electrode switching unit 112, a first electrode 121, a first shield unit 122, a second electrode 131, a second shield unit 132, An impedance index measurement unit 140, a curvature sensor 150, and a physical action detection unit 160 are provided. The processing unit 200 includes a second serial communication unit 210, a start condition determination unit 220, a perimeter detection unit 230, and a contour shape estimation unit 240. The start condition determination unit 220 includes an impedance determination unit 221. The contour shape estimation unit 240 includes a partial shape estimation unit 241, a partial determination unit 242, and an entire circumference shape estimation unit 243.

25, the same reference numerals (110, 121, 131, 140, 150, 160, 200, 210, 220, 221, 230, 240 to the parts having the same functions corresponding to the respective parts in FIG. 243) will be added and description thereof will be omitted.
The contour shape estimation device 2 is different from the contour shape estimation device 1 in that it includes a first shield part 122 and a second shield part 132.
The configuration of the belt main body 10 in the contour shape estimation apparatus 2, the arrangement of the flexible substrate 20 and the circuit board 30 in the belt main body 10, and the arrangement of the first electrode 121, the second electrode 131, the curvature sensor 150, and the connector 31 are shown in FIG. As described with reference to FIGS. 4 to 4, illustration and description are omitted here.

  FIG. 26 is an explanatory diagram illustrating an arrangement example of the first shield part 122 and the second shield part 132. The figure shows the first electrode 121 and the first shield part 122 when the belt body 10 is viewed from above (the user's face side) with the user wearing the contour shape estimation device 2 (belt body 10). And the positional relationship between the second electrode 131 and the second shield part 132 are shown.

As shown in FIG. 26, the first shield part 122 is disposed on one side of each of the plurality of first electrodes 121 with respect to the belt body 10, among the front and back sides of the belt body 10. The second shield part 132 is disposed on the other side of the second electrode 131 with respect to the belt body 10.
Specifically, as shown in FIG. 26, when the first electrode 121 and the second electrode 131 are opposed to each other, the first shield 121 and the second shield 132 are the first electrode 121 and the second shield 132. It arrange | positions in the position which pinches | interposes the electrode 131. FIG. When the second electrode 131 is located inside the first electrode 121 when viewed from the user as shown in FIG. 26, the first shield part 122 is disposed on the outside of each first electrode 121 so as to face the first electrode 121, A second shield part 132 is disposed inside the second electrode 131 so as to face the second electrode 131.
When the second electrode 131 is located outside the first electrode 121 when viewed from the user, the first shield part 122 is disposed inside each first electrode 121 so as to face the first electrode 121, A second shield part 132 is disposed outside the electrode 131 so as to face the second electrode 131.

FIG. 27 is an explanatory diagram showing an example of a circuit configuration for applying a voltage to the first shield part 122 and the second shield part 132.
In the example of FIG. 27, as in the case of FIG. 7, the AC voltage from the power supply unit 111 is applied to the first electrode 121 and the second electrode 131, and the impedance index measurement unit 140 is connected to each of the first electrodes 121. An index value indicating the impedance between the second electrode 131 is measured.

In FIG. 27, in addition to the configuration of FIG. 7, voltages applied to the first electrode 121 and the second electrode 131 are also applied to the operational amplifier 183. The first shield part 122 is connected to the operational amplifier 183 on the first electrode 121 side, and the second shield part 132 is connected to the operational amplifier 183 on the second electrode 131 side. The operational amplifier 183 adjusts the magnitude of the voltage while maintaining the phase of the voltage supplied from the power supply unit 111.
FIG. 27 shows the first electrode 121 facing the second electrode 131 among the plurality of first electrodes 121. The other first electrode 121 is also provided with an operational amplifier 183 and a first shield part 122, as shown in FIG.

With the configuration shown in FIG. 27, a voltage having the same phase as that of the first electrode 121 is applied to the first shield part 122. A voltage having the same phase as that of the second electrode 131 is applied to the second shield part 132. The power supply unit 111 that applies these voltages corresponds to an example of a voltage application unit.
When the voltage having the same phase as that of the first electrode 121 is applied to the first shield part 122, the first shield part 122 operates as an active shield that restricts the flow of the electromagnetic field from the first electrode 121. Thereby, the electromagnetic field from the first electrode 121 flows to the second electrode 131 side (the side opposite to the first shield part 122). Similarly, when a voltage having the same phase as that of the second electrode 131 is applied to the second shield part 132, the second shield part 132 operates as an active shield that restricts the flow of the electromagnetic field from the second electrode 131. Thereby, the electromagnetic field from the second electrode 131 flows to the first electrode 121 side (the side opposite to the second shield part 132).

  The electromagnetic field from the first electrode 121 flows to the second electrode 131 side, and the electromagnetic field from the second electrode 131 flows to the first electrode 121 side, so that the impedance between the first electrode 121 and the second electrode 131 is small. Become. Thereby, improvement of the determination accuracy of the impedance determination unit 221 is expected. In addition, improvement of the detection accuracy of the peripheral length by the peripheral length detection unit 230 is also expected. In particular, even when the voltage of the power source is relatively low, the impedance determination unit 221 can perform determination with high accuracy. Even when the voltage of the power supply is relatively low, the perimeter detection unit 230 can detect the perimeter with high accuracy.

As described above, the first shield portion 122 is disposed on one side of each of the plurality of first electrodes 121 with respect to the belt main body 10 on the front and back sides of the belt main body 10 to restrict the flow of electromagnetic waves. . The second shield part 132 is disposed on the other side of the second electrode 131 with respect to the belt body 10 to limit the flow of electromagnetic waves.
Thereby, mixing of noise into the first electrode 121 and the second electrode 131 can be reduced, and improvement in the determination accuracy of the impedance determination unit 221 is expected. In addition, improvement of the detection accuracy of the peripheral length by the peripheral length detection unit 230 is also expected.

The power supply unit 111 applies an in-phase AC voltage to at least one of the plurality of first electrodes 121 and the first shield unit 122, and applies an in-phase AC voltage to the second electrode 131 and the second shield unit 132. Apply.
Thereby, improvement of the determination accuracy of the impedance determination unit 221 is expected. In addition, improvement of the detection accuracy of the peripheral length by the peripheral length detection unit 230 is also expected. In particular, even when the voltage of the power source is relatively low, the impedance determination unit 221 can perform determination with high accuracy. Even when the voltage of the power supply is relatively low, the perimeter detection unit 230 can detect the perimeter with high accuracy.

  It should be noted that the curvature sensor 150 may be calibrated in both the first embodiment and the second embodiment. For example, a highly accurate electric resistance (resistor) is disposed in place of the strain gauge 153 of FIG. As this electric resistance, an electric resistance having a resistance value assumed as the resistance value of the strain gauge 153 in an unbent state is used. In order to switch between the strain gauge 153 and the electrical resistance, an electrical resistance may be arranged in parallel with the strain gauge 153 in advance, and either the strain gauge 153 or the electrical resistance may be selected with a switch.

Thus, by replacing the strain gauge with an electrical resistance, it is possible to grasp the change in the detection voltage due to the difference between the resistance value assumed for the strain gauge and the actual resistance value. The detection voltage here is a voltage between the point P11 and the point P12 in FIG.
By adding the detected change in the detected voltage as an offset to the amplifier 156, the curvature sensor 150 can measure the curvature with higher accuracy.

Alternatively, a high-accuracy constant voltage power supply may be prepared and switched between the detection voltage and the power supply from the constant voltage power supply. In this case, as the constant voltage power source, a constant voltage power source showing a voltage value assumed as a detection voltage in a state where the strain gauge 153 is not bent is used.
Thereby, the difference between the assumed detection voltage and the actual detection voltage can be grasped. By adding the detected change in the detected voltage as an offset to the amplifier 156, the curvature sensor 150 can measure the curvature with higher accuracy.

  Alternatively, the curvature sensor 150 may be bent to a known curvature by, for example, fitting the belt body 10 into a mold having a known curvature. In this case, the amplification (calibration curve) by the amplifier 156 is adjusted so that the output of the curvature sensor 150 matches the known curvature. Accordingly, the curvature sensor 150 can measure the curvature with higher accuracy.

In the first embodiment, the needle part 16 may be used as the second electrode 131.
FIG. 28 is an explanatory diagram showing an example of electrode arrangement when the needle portion 16 is used as the second electrode 131.
As described with reference to FIGS. 1 to 4, in the example of FIG. 28, the belt main body 10 includes the belt portion 11, the decorative case 13, the ring 14, and the buckle 15. It has a needle part 16. Further, the arrangement of the belt holes 12, the arrangement of the flexible board 20, the arrangement of the circuit board 30, and the arrangement of the curvature sensor 150 are the same as in the case of FIGS.

On the other hand, in the example of FIG. 28, the arrangement of the first electrode 121 and the second electrode 131 is different from the case of FIGS. In the example of FIG. 28, the second electrode 131 is provided on the needle portion 16. Specifically, the needle portion 16 is used as the second electrode 131. A first electrode 121 is provided around the belt hole 12 for each belt hole 12.
According to the configuration of FIG. 28, since the needle portion 16 is used as the second electrode 131, it is not necessary to provide the second electrode 131 separately. With the configuration of FIG. 28, the same effect as described in the first embodiment can be obtained. Specifically, as described above, it can be determined whether or not the needle portion 16 passes through the belt hole 12. Further, when the needle portion 16 passes through any one of the belt holes 12, it is possible to detect which belt hole 12 the needle portion 16 passes through, as described above.

It should be noted that a program for realizing the function of the processing unit 200 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to perform processing of each unit. Also good. Here, the “computer system” includes an OS and hardware such as peripheral devices.
Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1, 2 Contour shape estimation apparatus 10 Belt main body 11 Band part 13 Cosmetic case 14 Ring 15 Buckle 16 Needle part 20 Flexible board 30 Circuit board 31 Connector 100, 101 Sensor part 110 First serial communication part 111 Power supply part 112 Electrode switching part 113 First switch 121 First electrode 122 First shield part 131 Second electrode 132 Second shield part 140 Impedance index measurement part 150 Curvature sensor 160 Physical action detection part 200 Processing part 210 Second serial communication part 220 Start condition determination part 221 Impedance determination unit 230 Perimeter detection unit 240 Contour shape estimation unit 241 Partial shape estimation unit 242 Partial determination unit 243 Full-circumference shape estimation unit

Claims (11)

A belt body wound around a measurement target portion of the measurement target;
A plurality of first electrodes arranged side by side in the longitudinal direction of the belt body;
A second electrode provided on the belt body;
A plurality of curvature sensors provided side by side in the longitudinal direction of the belt body;
A physical action detector for detecting a predetermined physical action on the belt body;
An impedance determination unit for determining the presence or absence of the first electrode, wherein the impedance of the second electrode among the first electrodes is equal to or lower than a predetermined impedance;
When the physical action detection unit detects the predetermined physical action, and the impedance determination unit determines that there is the first electrode whose impedance with the second electrode is equal to or lower than a predetermined impedance A contour shape estimation unit that estimates a contour shape of the measurement target portion based on a sensor value of the curvature sensor;
A contour shape estimation apparatus comprising:   The contour shape estimation apparatus according to claim 1, wherein the physical action detection unit detects a movement of the belt body.   The contour shape estimation apparatus according to claim 1, wherein the physical action detection unit detects a pressure on a predetermined portion of the belt main body.   The contour shape according to any one of claims 1 to 3, further comprising a perimeter detection unit that detects a perimeter of the measurement target portion based on an impedance between the first electrode and the second electrode. Estimating device.   The perimeter detection unit is configured such that the physical action detection unit detects the predetermined physical action, and the impedance determination unit has an impedance with the second electrode equal to or lower than a predetermined impedance. The contour shape estimation apparatus according to claim 4, wherein when it is determined that there is one electrode, a perimeter of the measurement target portion is detected. The contour shape estimation unit
A partial shape estimation unit that estimates a partial shape that is a partial shape of the entire contour of the measurement target portion based on a sensor value of the curvature sensor;
A part determination unit that determines which part of the entire shape of the measurement target part is based on the peripheral length of the outline of the measurement target part; and
Based on the determination result of the partial determination unit and the assumption that the contour shape of the entire circumference of the measurement target portion is axisymmetric, the whole contour shape of the entire circumference of the measurement target portion is estimated from the partial shape. A circumferential shape estimation unit;
The contour shape estimation apparatus according to claim 4 or 5, comprising: The belt body includes a buckle having a needle part,
The belt body is provided with a plurality of holes through which the needle part passes in the longitudinal direction,
The first electrode is provided around the hole for each of the plurality of holes,
The second electrode is provided on the needle part,
The contour shape estimation apparatus according to any one of claims 1 to 6. Of the front and back sides of the belt body, a first shield part that is disposed on one side of each of the plurality of first electrodes with respect to the belt body and restricts the flow of electromagnetic waves,
A second shield part that is disposed on the other side of the second electrode with respect to the belt body and restricts the flow of electromagnetic waves;
The contour shape estimation apparatus according to any one of claims 1 to 6.   A voltage application unit is provided that applies an in-phase AC voltage to at least one of the plurality of first electrodes and the first shield part, and applies an in-phase AC voltage to the second electrode and the second shield part. The contour shape estimation apparatus according to claim 8. A physical action detection step for detecting a predetermined physical action on the belt body wound around the measurement target portion of the measurement object;
Among the plurality of first electrodes provided side by side in the longitudinal direction of the belt body, the impedance for determining the presence or absence of the first electrode whose impedance with the second electrode provided on the belt body is equal to or lower than a predetermined impedance A determination step;
When the predetermined physical action is detected in the physical action detection step, and it is determined in the impedance determination step that the first electrode has an impedance with the second electrode equal to or lower than a predetermined impedance. A contour shape estimation step for estimating a contour shape of the measurement target portion based on sensor values of a plurality of curvature sensors provided side by side in the longitudinal direction of the belt body;
Contour shape estimation method including On the computer,
A physical action detection step for detecting a predetermined physical action on the belt body wound around the measurement target portion of the measurement object;
Among the plurality of first electrodes provided side by side in the longitudinal direction of the belt body, the impedance for determining the presence or absence of the first electrode whose impedance with the second electrode provided on the belt body is equal to or lower than a predetermined impedance A determination step;
When the predetermined physical action is detected in the physical action detection step, and it is determined in the impedance determination step that the first electrode has an impedance with the second electrode equal to or lower than a predetermined impedance. A contour shape estimation step for estimating a contour shape of the measurement target portion based on sensor values of a plurality of curvature sensors provided side by side in the longitudinal direction of the belt body;
A program for running

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