Flexible sensor and measuring device

Abstract

The present application provides a kind of flexible sensor and measuring device, the front end of the coil body is prevented from being deformed in the state of not applying stress.The flexible sensor (10) detects the physical quantity of the measurement object in the state of surrounding the measurement object, the flexible sensor (10) includes: detection body (1), which is flexibly formed with elastic front end (11), and detects the physical quantity of the measurement object;And main body (2), the base end (13) of detection body (1) is installed, and has the insertion channel (70) for inserting the front end (11) of detection body (1), insertion channel (70) is flexibly formed into the same shape as the front end (11) in the state of not applying stress to the front end (11) of detection body (1).

Description

TECHNICAL FIELD

[0001] The present application relates to a flexible sensor that detects a physical quantity of a measurement object and a measurement device. BACKGROUND

[0002] A current sensor that detects a current value flowing through a measurement object has been disclosed in the past (for example, see Patent Literature 1). The current sensor includes a coil body obtained by spirally winding a wire on a hollow flexible member having insulating properties, and a holding portion that holds the coil body. When the current sensor is used to detect a current value flowing through a measurement object, the coil body is bent into a ring shape, so as to surround the measurement object with the coil body, and the holding portion holds the coil body. Thus, the coil body constitutes a Rogowski coil, and can detect a current value flowing through a measurement object.

[0003] The coil body has elasticity, and the curvature of the front end portion is formed larger than the curvature of the base end portion. Thus, the front end of the coil body inserted into the back of the measurement object can be easily directed from the back to the front of the measurement object, so as to easily surround the measurement object.

[0004] (Patent Literature)

[0005] (Patent Literature)

[0006] Patent Literature 1: JP 2019-196962 A SUMMARY

[0007] (Problem to be Solved by the Invention)

[0008] However, in the above-described holding portion, the insertion portion for inserting the front end portion of the coil body is formed into a shape different from that of the front end portion of the coil body, and thus the front end portion of the coil body is deformed in correspondence with the shape of the insertion portion, and is held in that state in the holding portion.

[0009] The inventors have found that in this case, a stress against the elastic force is continuously applied to the front end portion of the coil body, and as a result of this stress, the shape of the front end portion of the coil body in the state where no stress is applied changes (habitual change).

[0010] Therefore, the present application has been achieved in view of the above-described problem, and an object thereof is to provide a flexible sensor and a measurement device that can prevent the shape of the front end portion of the coil body from changing in a state where no stress is applied.

[0011] (Solution to the Problem)

[0012] To solve the above problems, one embodiment of the present application is a flexible sensor that detects a physical quantity of a measurement object in a state of surrounding the measurement object, characterized by including: a detection body that is bent to have a front end portion with elasticity and that detects the physical quantity of the measurement object; and a main body portion that has a base end portion of the detection body mounted thereon and that has an insertion passage for inserting the front end portion of the detection body, the insertion passage being bent to have the same shape as the front end portion in a state where stress is not applied to the front end portion of the detection body.

[0013] Further, the insertion passage is preferably bent in a direction in which the detection body is bent when the detection body is inserted into the insertion passage.

[0014] Further, the insertion passage is preferably bent in an arc shape.

[0015] Further, the insertion passage is preferably bent along a part of a circular ring in a manner that the detection body forms the circular ring when the front end portion of the detection body is inserted into the insertion passage.

[0016] Further, the main body portion preferably has a guide portion that guides the front end portion of the detection body to the insertion passage.

[0017] Further, the guide portion is preferably formed in a manner that narrows toward an opening surface of the insertion passage.

[0018] Further, the main body portion preferably has a holding portion at an end portion on a side opposite to the guide portion in the insertion passage, for holding the front end portion of the inserted detection body.

[0019] One embodiment of the present application is a measurement device characterized by including the above flexible sensor and a measurement portion that measures a physical quantity of the measurement object based on a detection signal detected by the flexible sensor.

[0020] (EFFECTS OF INVENTION)

[0021] According to the configuration of the present application, it is possible to prevent the shape of the front end portion of the coil body from changing in a state where stress is not applied. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a view showing the configuration of a measurement device including a flexible sensor.

[0023] Figure 2 is a view showing a state of viewing the flexible sensor from above.

[0024] Figure 3 is a perspective view of the flexible sensor in a state where a detection body is opened.

[0025] Figure 4 is a perspective view of the flexible sensor in the closed state of the detection body.

[0026] Figure 5 is a plan view of the first housing.

[0027] Figure 6 is a perspective view of the first housing in the open state of the detection body.

[0028] Figure 7 is a perspective view of the first housing in the closed state of the detection body.

[0029] Figure 8 is a plan view of the second housing.

[0030] Figure 9 is a perspective view of the second housing in the open state of the detection body.

[0031] Figure 10 is a perspective view of the second housing in the closed state of the detection body.

[0032] Figure 11 is a diagram showing a step of surrounding a terminal of an electronic component with a detection body.

[0033] Figure 12 is a perspective view of a flexible sensor showing another form of a guide portion. DETAILED DESCRIPTION

[0034] A preferred embodiment of the present application will be described with reference to the accompanying drawings. Note that the following embodiment is merely an example, and various modifications can be made within the scope of the present application.

[0035] <Measurement device>

[0036] First, the measurement device will be described.

[0037] As shown in FIG. 1, the measurement device 100 includes a flexible sensor 10 that detects a current flowing through a measurement target, an integration circuit 30 that integrates a detection signal output from the flexible sensor 10, and a measurement unit 40 that measures a physical quantity of the measurement target based on a signal output from the integration circuit 30. Figure 1 As the measurement target, a power line through which an alternating current flows, a terminal of an electronic component mounted on a substrate, or the like can be given. As the physical quantity of the measurement target, a value of the alternating current flowing through the measurement target, an alternating power value, a value of an alternating magnetic field generated around the measurement target, or the like can be given.

[0038] (Flexible sensor)

[0039]

[0040] ​The flexible sensor 10 detects an alternating current flowing through a measurement object in a state of surrounding the measurement object. The flexible sensor 10 includes a detection body 1 curved in a manner that a predetermined curvature is provided at a front end portion, and detecting an alternating current flowing through the measurement object, and a main body portion 2 in which a base end portion 13 of the detection body 1 is installed, and holding the front end portion 11 of the inserted detection body 1.

[0041] As shown in Figures 2-4 , the detection body 1 is curved in advance to form a shape having a predetermined curvature in order to easily surround the measurement object. The detection body 1 has flexibility and can be curved when surrounding the measurement object. The detection body 1 has elasticity and returns to the original shape or substantially returns to the original shape when an external force is removed.

[0042] The detection body 1 has a Rogowski coil formed along a length direction (extending direction). That is, the detection body 1 is a Rogowski coil type current sensor having flexibility.

[0043] The Rogowski coil is formed by spirally winding a wire on a hollow flexible member having insulation. The flexible member is composed of, for example, a synthetic resin such as vinyl chloride or polyethylene. The wound wire is folded back near the front end la of the detection body 1, and extends to the base end lb of the detection body 1 after passing through the inside of the hollow flexible member.

[0044] The Rogowski coil is formed in a ring shape in a state in which the front end portion 11 is inserted into the main body portion 2 (a state shown in Figure 4 ). That is, the detection body 1 is held in the main body portion 2 in such a manner that the end surface of the base end portion 13 and the end surface of the front end portion 11 are opposed to each other with a slight gap, and the axis of the base end portion 13 coincides with the axis of the front end portion 11. Thereby, the gap between the front end la and the base end lb of the detection body 1 forming the Rogowski coil can be reduced, and the influence of noise caused by magnetic flux generated from other conductors approaching the detection body 1 can be reduced.

[0045] The detection body 1 as a whole is covered with a resin material such as a fluorine resin. Thereby, the detection body 1 can be prevented from being damaged by scratching the measurement object or other adjacent members when surrounding the measurement object.

[0046] At the front end portion 11 of the detection body 1, a portion having a curvature larger than that of the base end portion 13 including the base end lb of the detection body 1 is formed in a state in which the flexible sensor 10 is opened (a state in which no stress is applied). The front end portion 11 is a portion including a predetermined length of the front end la of the detection body 1. The detection body 1 is formed in such a manner that the curvature becomes larger from the base end lb toward the front end la. That is, the front end portion 11 of the detection body 1 is curved in an arc shape, and is curved along a part of a circular ring in such a manner that the detection body 1 forms the circular ring when the front end portion 11 of the detection body 1 is inserted into the insertion passage 70.

[0047] As Figure 2 shown, the detection body 1 is formed in such a manner that the front end la around the back of the measurement object is more forward than the front surface (paper surface) of the measurement object, and the front end portion 11 is curved toward the inside in advance along the shape of the insertion passage 70 (to be described later) of the main body portion 2. Therefore, the detection body 1 is curved in such a manner that the tangent line of the intermediate portion 12 between the front end portion 11 and the base end portion 13 of the detection body 1 is orthogonal to the straight line extending in the extension direction of the main body portion 2.

[0048] Further, the base end portion 13 of the detection body 1 is formed in a straight line shape in order to easily transmit the force to the intermediate portion 12 of the detection body 1 when the operator presses the main body portion 2 toward the measurement object with a finger. Furthermore, the intermediate portion 12 of the detection body 1 is formed in such a manner that the curvature is larger than that of the base end portion 13 of the detection body 1 and smaller than that of the front end portion 11 in order to prevent the detection body 1 from easily scratching the edge of the adjacent member of the measurement object.

[0049] As described above, in the detection body 1, the curvature of the detection body 1 gradually or continuously becomes larger as it is closer to the front end portion 11 from the base end portion 13. Thereby, the force applied by the operator is easily transmitted from the main body portion 2 to the detection body 1, and the detection body 1 is not easily scratched the measurement object or the adjacent member.

[0050] The main body portion 2 is a portion that is operated by the operator when the detection body 1 surrounds the measurement object. As Figures 2-4 shown, the main body portion 2 includes, for example, a first housing 5, and a second housing 6 that is embedded in the first housing 5 and housed in the first housing 5.

[0051] As Figures 5-7 shown, the first housing 5 is a housing that forms the outer side of the main body portion 2. The first housing 5 is formed in a box shape having a bottom portion 51 and a side wall portion 52, and the upper surface is opened. The first housing 5 has a protruding portion 5a protruding toward the measurement object surrounded by the detection body 1 at one end in the length direction. The protruding portion 5a is formed in a circular arc shape that is substantially concentric with the circular arc of the radius of curvature of the detection body 1 in a state where the front end portion 11 of the detection body 1 is held in the main body portion 2. The protruding portion 5a is used to limit the size of the measurement object surrounded by the detection body 1 in the closed state of the detection body 1. Thereby, it is possible to limit in such a manner that the detection body 1 does not surround the measurement object that is too thick to flow through the current that is larger than the measurable range of the flexible sensor 10. Further, by providing the protruding portion 5a, it is possible to make the measurement object not be located at the gap between the front end la and the base end lb of the detection body 1 that forms the Rogowski coil.

[0052] A slit 53, 54 extending from the opening side to the bottom 51 is formed on each of the pair of opposing side wall portions 52. The slits 53, 54 are formed so as to extend in the height direction of the first housing 5. A cable 3 for connecting the matching circuit 20 housed in the main body portion 2 and the integrating circuit 30 is inserted in the slit 53. The base end portion 13 of the detection body 1 mounted on the main body portion 2 is inserted in the slit 54. Note that the matching circuit 20 is a circuit for matching the impedance on the detection body 1 side and the impedance on the measurement portion 40 side. The base end 1b of the detection body 1 and the matching circuit 20 are electrically connected by a cable 21 (refer to FIG. 2). Figure 1 ) while the detection body 1 is inserted into the slit 54.

[0053] A hole 55 is formed in one of the other side wall portions 52 so as to penetrate from the outer surface to the inner surface of the side wall portion 52. The hole 55 is formed so as to gradually increase in the opening area from the inner surface side to the outer surface side of the side wall portion 52. That is, the peripheral wall of the hole 55 is an inclined surface inclined so as to expand toward the outside of the hole 55, and functions as a guide portion 56 that guides the front end portion 11 of the detection body 1 to the hole 55 when the front end portion 11 is inserted. Therefore, the guide portion 56 is formed so as to gradually narrow toward the opening surface of the insertion passage 70, and guides the inserted detection body 1 to the insertion passage 70.

[0054] A protrusion portion 57 is provided in the bottom 51 so as to be continuous with the hole 55. One end of the protrusion portion 57 is formed so as to be adjacent to the hole 55, and the other end is formed so as to be opposite to the slit 54 at a prescribed distance therefrom. The protrusion portion 57 is formed so that the upper surface of the one end has the same height as the edge of the bottom 51 on the hole 55 side. The protrusion portion 57 is formed so as to curve in a prescribed curvature from the one end to the other end in plan view. The curvature of the protrusion portion 57 is formed so as to be the same as the curvature of the front end portion 11 of the detection body 1. That is, when the front end portion 11 of the detection body 1 is inserted into the hole 55, the front end portion 11 of the detection body 1 is disposed along the upper surface of the protrusion portion 57. Therefore, the protrusion portion 57 forms the bottom of the insertion passage 70.

[0055] That is, the protrusion portion 57 is curved so as to have the same shape as the front end portion 11 of the detection body 1 in a state in which no stress is applied to the front end portion 11, and is curved so as to curve in the direction in which the detection body 1 is curved when the front end portion 11 of the detection body 1 is inserted from the hole 55 into the insertion passage 70. Further, the protrusion portion 57 is curved in an arc shape, and is curved along a portion of a circular ring formed by the detection body 1 when the front end portion 11 of the detection body 1 is inserted from the hole 55 into the insertion passage 70.

[0056] The retaining part 58 is disposed adjacent to the other end of the protrusion part 57 (the end opposite to the hole 55). The retaining part 58 is, for example, an O-ring formed of elastic material. By inserting the front end 11 of the detection body 1, which reaches the other end of the protrusion part 57, into the hole of the O-ring, the front end 11 of the detection body 1 can be retained by elastic force.

[0057] like Figures 8-10 As shown, the second housing 6 is housed inside the first housing 5. The second housing 6 is formed as a box with a bottom 61 and sidewalls 62, and an open upper surface. When the second housing 6 is housed in the first housing 5, the outer surface of the bottom 61 runs along the inner surface of the bottom 51, and the outer surface of the sidewalls 62 runs along the inner surface of the sidewalls 52. The second housing 6 has a protrusion 6a at one end in the longitudinal direction that protrudes toward the object being measured, which is surrounded by the detection body 1. The protrusion 6a is formed along the inner side of the protrusion 6a when the second housing 6 is housed in the first housing 5.

[0058] Slits 63 and 64, extending from the opening side toward the bottom 61, are formed on a pair of opposing sidewall portions 62. The slits 63 and 64 are formed such that they extend along the height direction of the second housing 6. When the second housing 6 is housed within the first housing 5, the slits 63 and 64 are formed opposite to the slits 53 and 54 of the first housing 5, and are in a state where they connect from the interior of the second housing 6 to the exterior of the first housing 5. A cable 3 is inserted into the slit 63, and the cable 3 is used to connect the matching circuit 20 and the integrating circuit 30 housed in the main body portion 2. The base end portion 13 of the detector 1 mounted on the main body portion 2 is inserted into the slit 64.

[0059] One of the other sidewall portions 62 has a hole 65 extending from the outer surface of the sidewall portion 62 to the inner surface. When the second housing 6 is received into the first housing 5, the hole 65 is formed in a position opposite to the hole 55 of the first housing 5, and is in a state of communicating from the interior of the second housing 6 to the exterior of the first housing 5. The hole 65 is formed in a manner that is substantially the same in shape and area as the opening on the innermost surface side of the hole 55 of the first housing 5.

[0060] An arch portion 66 is provided in the bottom portion 61 so as to be continuous with the hole 65. One end of the arch portion 66 is formed so as to be continuous with the hole 65 and abut the hole 65, and the other end is formed so as to cover the holding portion 58 provided in the first case 5. The arch portion 66 is formed along the ridge portion 57 provided in the first case 5 so as to cover the ridge portion 57 from one end to the other end. That is, the arch portion 66 is curved so as to have the same curvature in the extending direction (axis) as the curvature of the ridge portion 57 when viewed from above. Thus, the ridge portion 57 and the arch portion 66 are formed so as to have the same curvature as the curvature of the front end portion 11 of the test strip 1, and when the second case 6 is housed in the first case 5, the space surrounded by the ridge portion 57 and the arch portion 66 functions as an insertion passage 70 for the front end portion of the test strip 1. Therefore, the arch portion 66 forms a side wall portion and a ceiling portion of the insertion passage 70.

[0061] That is, the arch portion 66 is curved so as to have the same shape as the front end portion 11 in a state where no stress is applied to the front end portion 11 of the test strip 1, and is curved so as to be curved in the direction in which the test strip 1 is curved when the test strip 1 is inserted into the insertion passage 70 from the hole 55. Further, the arch portion 66 is curved in an arc shape and is curved along a portion of a circular ring in which the test strip 1 is formed when the front end portion 11 of the test strip 1 is inserted into the insertion passage 70 from the hole 55.

[0062] A partition wall 67 is provided in the bottom portion 61 as a wall portion. The partition wall 67 is provided so as to abut the other end of the insertion passage 70 (the ridge portion 57 and the arch portion 66) in opposition. Further, since the holding portion 58 is provided at the other end of the insertion passage 70, the partition wall 67 is also provided so as to abut the holding portion 58 in opposition. The partition wall 67 is provided upright between the front end portion 11 of the test strip 1 inserted into the insertion passage 70 and the base end portion 13 of the test strip 1 inserted from the slits 54, 64, and separates the front end portion 11 from the base end portion 13 so as not to be in contact.

[0063] A plurality of guide pieces 68 are provided in the bottom portion 61. The guide pieces 68 are provided upright in the bottom portion 61 along the edges of the respective slits 63, 64. The guide pieces 68 guide the insertion of the base end portion 13 of the test strip 1 and the cable 3.

[0064] A placement portion 69 is provided in the bottom portion 61. The placement portion 69 functions as a placement stage for placing the matching circuit 20 provided in the second case 6.

[0065] (Integration circuit)

[0066] As Figure 1As shown, the integrating circuit 30 converts the detection signal into a signal proportional to the amplitude of the current flowing through the object being measured. This detection signal represents the voltage induced in the conductor of the detection body 1 due to the current flowing through the object being measured. The integrating circuit 30 outputs the converted signal as a detection signal to the measuring unit 40.

[0067] (Measurement Department)

[0068] like Figure 1 As shown, the measurement unit 40 measures physical quantities related to the object being measured based on a detection signal from the integrator circuit 30. For example, if the measurement unit 40 receives a detection signal from the integrator circuit 30, it measures the alternating current flowing through the object being measured based on that detection signal. The measurement unit 40 can also measure other physical quantities, such as alternating power or magnetic field strength based on the received detection signal. The measurement unit 40 displays the waveform of the measured physical quantity on a screen. The measurement unit 40 may include, for example, an oscilloscope, a power meter, or an ammeter.

[0069] <Application Forms of Flexible Sensors>

[0070] Next, the usage of the flexible sensor 10 will be explained.

[0071] like Figure 3 As shown, the flexible sensor 10 is in the open state when the front end 11 of the detector 1 is not inserted into the insertion channel 70. If, in this state, the operator aligns the front end 11 with the hole 55 and inserts the front end 11 into the insertion channel 70 with their finger, it becomes... Figure 4 The state shown.

[0072] like Figure 4 As shown, the operator inserts the front end 11 of the detector 1 deep into the insertion channel 70, thereby holding the front end 11 of the detector 1 on the holding portion 58. Thus, the flexible sensor 10 is in a closed state, and the object to be measured is surrounded by the detector 1.

[0073] If the front end 11 of the detector 1 is removed from the insertion channel 70 of the main body 2, the elastic detector 1 will return to its original state. Figure 3 The original shape shown.

[0074] <Methods for measuring an object using a measuring device>

[0075] Next, the measuring object is measured using a measuring device. At this time, the terminals (pins) of electronic components mounted on the substrate are used as the measuring object, and the steps of surrounding the terminals of electronic components with the detection body 1 will be explained. Figure 11 This diagram illustrates the process of moving the front end 1a of the detector 1 from behind the terminal 91 of the electronic component 90 to the front.

[0076] In Figure 11 In the example shown, the electronic component 90 uses an integrated circuit (IC) or a DC / DC converter, or the like, as an electronic component. The interval between the terminals 91 and 92 of the electronic component 90 is about several millimeters (mm). The thickness (diameter) of the detection body 1 is formed to be, for example, 1 mm or more to 2 mm or less, so as to be able to be inserted between the terminals 91 and 92.

[0077] As Figure 11 (a) shows, the operator holds the main body 2 with the fingertips, and moves the main body 2 toward the terminal 91 in this state, so as to insert the front end la of the detection body 1 between the electronic component 90 and the terminal 91.

[0078] At this time, since the front end portion 11 of the detection body 1 is formed to have a curvature that is equal to or greater than the curvature (reference curvature) in the closed state of the flexible sensor 10, when the front end portion 11 of the detection body 1 is inserted behind the terminal 91, the front end la of the detection body 1 is moved so as to cover behind the terminal 91. Therefore, it is possible to suppress the detection body 1 from being damaged by scratching the edge of the terminal 91.

[0079] Further, since the front end portion 11 of the detection body 1 is formed to have a curvature that is equal to or greater than the curvature in the closed state of the flexible sensor 10, the front end la of the detection body 1 that passes behind the terminal 91 is easily moved from the back to the front of the terminal 91 with respect to the insertion direction A of the detection body 1. Thus, in order to expose the front end la of the detection body 1 in front of the terminal 91, the operator can easily make the front end la of the detection body 1 abut against the side surface of the terminal 92. Therefore, it is possible to make the front end la of the detection body 1 pass through the narrow gap between the terminals 92 and 91 from the back to the front of the terminal 91.

[0080] Note that the radius of curvature of the front end portion 11 of the detection body 1 is preferably smaller than the interval between the terminals 91 and 92 of the electronic component 90. In particular, when the radius of curvature of the front end portion 11 is formed to be 2 mm or more to 4 mm or less, it is possible to suppress the detection body 1 from being damaged by scratching the edge of the terminal 92 provided on the electronic component 90.

[0081] Next, as shown in (b), the operator further moves the main body 2 in the insertion direction A in such a manner that the middle portion 12 of the detection body 1 is pressed against the electronic component 90 behind the terminal 91. Thus, the middle portion 12 of the detection body 1 is pressed against the electronic component 90, and this portion becomes a fulcrum to make the detection body 1 move toward the inner side B, and therefore, the detection body 1 is less likely to scratch the edges of the terminals 91 and 92, respectively. Thus, the detection body 1 is less likely to be damaged. Figure 11

[0082] Next, as shown in (b), the operator further moves the main body 2 in the insertion direction A in such a manner that the middle portion 12 of the detection body 1 is pressed against the electronic component 90 behind the terminal 91. Thus, the middle portion 12 of the detection body 1 is pressed against the electronic component 90, and this portion becomes a fulcrum to make the detection body 1 move toward the inner side B, and therefore, the detection body 1 is less likely to scratch the edges of the terminals 91 and 92, respectively. Thus, the detection body 1 is less likely to be damaged. Figure 11 ​(c) shown, the operator pushes the main body 2 in the insertion direction A, thereby sending the remaining detection body 1 behind the terminal 91. At this time, since the curvature of the intermediate portion 12 of the detection body 1 is smaller than the curvature in the state in which the flexible sensor 10 is closed toward the main body 2, the detection body 1 can be inhibited from being bent, while the leading end portion 11 of the detection body 1 is brought close to the insertion passage 70 of the main body 2.

[0083] Then, the operator embeds the leading end portion 11 of the detection body 1 into the insertion passage 70 and holds it with the holding portion 58, so that the measurement object is surrounded by the detection body 1. As such, in the flexible sensor 10, the terminal 91 can be easily surrounded by the detection body 1 by the hand of the operator.

[0084] According to the flexible sensor 10 as described above, the insertion passage 70 is curved into a shape identical to that of the leading end portion 11 of the detection body 1 in the state in which no force acts on the detection body 1. That is, the curvatures are identical, so the detection body 1 can be inserted into the insertion passage 70 in the state in which no stress is applied, thereby making it possible to prevent the shape of the leading end portion 11 of the detection body 1 in the state in which no stress is applied from changing (habituation change).

[0085] Further, the insertion passage 70 is curved in a direction in which the detection body 1 is bent when the leading end portion 11 of the detection body 1 is inserted into the insertion passage 70, so the detection body 1 can be made into a ring shape and the leading end portion 11 can be easily inserted into the insertion passage 70.

[0086] Further, the insertion passage 70 is curved in an arc shape, so the leading end portion 11 of the detection body 1 can be smoothly inserted into the insertion passage 70.

[0087] Further, the insertion passage 70 is curved along a portion of a circular ring in a manner such that the detection body 1 forms the circular ring when the leading end portion 11 of the detection body 1 is inserted into the insertion passage 70, and the detection body 1 can be made to form the circular ring, so it is possible to measure a measurement object having a large diameter as compared with the case in which the detection body 1 does not form the circular ring.

[0088] Further, the detection body 1 can reduce leakage of magnetic flux and improve the detection accuracy of the flexible sensor 10, since the leading end portion 11 and the base end portion 13 are held in the main body 2 in a manner in which the axes thereof coincide and the end faces thereof face each other.

[0089] Further, the leading end portion 11 and the base end portion 13 can be held in the main body 2 in a manner in which they face each other by a simple operation of inserting the leading end portion 11 of the detection body 1 into the insertion passage 70.

[0090] Further, a guide portion 56 that guides the front end portion 11 of the test body 1 to the hole 55 is formed around the hole 55, so even if the front end portion 11 of the test body 1 to be inserted into the insertion passage 70 is deviated from the position of the hole 55, the front end portion 11 can be guided to the hole 55 by the guide portion 56, and the front end portion 11 can be easily inserted into the insertion passage 70. The operator can also easily know the position where the test body 1 should be inserted.

[0091] Here, the guide portion 56 is formed by an inclined surface that extends obliquely toward the outside of the hole 55, so the front end portion 11 of the test body 1 can be prevented from scratching the first housing 5, and the front end portion 11 can be smoothly guided to the hole 55.

[0092] Further, since the holding portion 58 is provided in the first housing 5, the front end portion 11 of the test body 1 inserted into the insertion passage 70 can be held, and the front end portion 11 can be prevented from falling out of the insertion passage 70. Further, by holding the front end portion 11 of the test body 1 in the holding portion 58, the operator can recognize that the front end portion 11 has been inserted to the necessary prescribed position.

[0093] Further, the main body portion 2 is composed of two housings of the first housing 5 and the second housing 6, so compared to the case where the main body portion 2 is integrally manufactured, the manufacture of the main body portion 2 can be made easy. Further, since the insertion passage 70 can be formed by the protrusion portion 57 of the first housing 5 and the arched portion 66 of the second housing 6, even if the housings are two, the insertion passage 70 can be formed.

[0094] Further, the interval wall 67 that is erected between the base end portion 13 and the front end portion 11 of the test body 1 to be held is provided in the second housing 6, so the base end portion 13 and the front end portion 11 of the test body 1 that are arranged in the main body portion 2 in a manner of facing each other do not come into contact. Thus, the test body 1 can be prevented from being damaged.

[0095] Further, since the curvature of the front end portion 11 of the test body 1 is larger than the curvature of the base end portion 13, the front end la of the test body 1 inserted behind the measurement object can be easily directed from the back to the front of the measurement object. Thus, the operator can operate the main body portion 2 without putting his or her hand or a tweezers or the like behind the measurement object, so the front end la of the test body 1 can be easily brought to the front of the measurement object. Thus, the front end la of the test body 1 can be easily pulled to the front of the measurement object, and the test body 1 as a whole can surround the measurement object. Therefore, even if the operator does not put his or her hand behind the measurement object or it is inconvenient to put in, the measurement object can be easily surrounded.

[0096] <Other>

[0097] The above describes preferred embodiments of the present application, but the present application is not limited to the above-described embodiments, and includes all modes of the present application concept and the claims. Further, each component can be appropriately selected and combined to achieve at least a part of the above-described objects and effects. Further, for example, the shape, material, arrangement, size, and the like of each component in the above-described embodiments can be appropriately changed according to the specific use mode of the present application.

[0098] For example, as shown in FIG. 6, a cylindrical member 56a can be provided on the surface of the first housing 5, and the cylindrical member 56a can be used as a guide portion of the hole 55. A space formed on the inner surface side of the cylindrical member 56a is connected to the hole 55, and thus the front end portion 11 of the detection body 1 can be guided into the hole 55 by inserting the front end portion 11 into the cylindrical member 56a. With this configuration, since the cylindrical member 56a protrudes from the surface of the first housing 5, the operator can easily find the insertion destination of the front end portion 11 of the detection body 1. Figure 12 Further, the front end portion 11 of the detection body 1 can have a recognition portion that allows the operator to recognize that the front end portion 11 has been inserted to a predetermined position in the insertion passage 70. That is, the portion of the detection body 1 that is inserted into the insertion passage 70 can be distinguished from the other portion. Specifically, the recognition portion and the other portion can be given different colors or patterns, and the operator can visually recognize the difference. Thus, the front end portion 11 of the detection body 1 can be inserted to the predetermined position in the insertion passage 70, and thus the gap between the front end 1a and the base end 1b of the detection body 1 that forms the Rogowski coil can be prevented from changing in size each time the current of the measurement object is measured.

[0099] Further, the holding portion 58 is not limited to being provided on the side of the insertion passage 70 (the end portion on the side opposite to the hole 55), and can be provided, for example, on the entrance side of the insertion passage 70 (near the hole 55) or in the middle of the insertion passage 70.

[0100] Further, the main body portion 2 is configured by two members of the first housing 5 and the second housing 6, but the two housings can be integrally formed by one member.

[0101] Further, each end surface of the detection body 1 is not limited to being formed as a single flat surface, and can have a curved surface or a curved face.

[0102] Further, the entire insertion passage 70 can function as the holding portion 58.

[0103] Further, the entire insertion passage 70 can function as the holding portion 58.

[0104] Further, the slit 64 and the base end portion 13 can be formed in an arc shape in the direction in which the detection body 1 is bent into a circular ring shape. Not only the front end portion 11 of the detection body 1 but also the base end portion 13 is formed in an arc shape, so that the detection body 1 can surround the measurement object in a manner close to a perfect circle when the detection body 1 is inserted into the insertion passage 70, and thus a measurement object having a larger diameter can be measured.

[0105] Further, the front end portion 11 of the detection body 1 can be formed to have elasticity, and the entire or a part of the detection body 1 can be formed to have flexibility.

[0106] Further, the insertion passage 70 can be formed to have the same curvature from one end to the other end. By forming the entire insertion passage 70 to have the same curvature, the front end portion 11 of the detection body 1 is not forced to be deformed not only when the front end portion 11 of the detection body 1 is inserted into the insertion passage 70 but also when the front end portion 11 of the detection body 1 is inserted into or pulled out of the insertion passage 70, and thus the change in the shape of the front end portion 11 of the detection body 1 in a state in which the detection body 1 is not stressed can be further prevented.

[0107] Explanation of symbols

[0108] 1 detection body; 11 front end portion; 13 base end portion; 2 main body portion; 5 first housing; 55 hole; 56 guide portion; 57 protrusion portion; 58 holding portion; 6 second housing; 65 hole; 66 arched portion; 67 partition wall; 10 flexible sensor; 20 matching circuit; 30 integration circuit; 40 measurement portion; 70 insertion passage; 90 electronic component; 91, 92 terminal; 100 measurement device.

Claims

1. A flexible sensor that detects a physical quantity of a measurement object in a state of surrounding the measurement object, characterized by, including: a detection body which is curved to have a front end portion with elasticity and which is used to detect a physical quantity of the measurement object; and a main body portion in which a base end portion of the detection body is installed and which has an insertion passage for inserting the front end portion of the detection body, the insertion passage is curved to have the same shape as the front end portion of the detection body in a state where stress is not applied to the front end portion. The insertion passage is curved in a direction in which the detection body is curved when the detection body is inserted into the insertion passage.

2. The flexible sensor of claim 1, wherein, The insertion passage is curved in an arc shape.

3. The flexible sensor of claim 1 or 2, wherein, The insertion passage is curved along a part of a circular ring in such a manner that the detection body forms the circular ring when the front end portion of the detection body is inserted into the insertion passage.

4. The flexible sensor of claim 1 or 2, wherein, The insertion passage is curved along a part of a circular ring in such a manner that the detection body forms the circular ring when the front end portion of the detection body is inserted into the insertion passage.

5. The flexible sensor of claim 3, wherein, The main body portion has a guide portion which guides the front end portion of the detection body to the insertion passage.

6. The flexible sensor of claim 1, 2, or 5, wherein, The main body portion has a guide portion which guides the front end portion of the detection body to the insertion passage.

7. The flexible sensor of claim 3, wherein, The main body portion has a guide portion which guides the front end portion of the detection body to the insertion passage.

8. The flexible sensor of claim 4, wherein, The guide portion is formed in such a manner that it narrows toward an opening surface of the insertion passage.

9. The flexible sensor of claim 6, wherein, The guide portion is formed in such a manner that it narrows toward an opening surface of the insertion passage.

10. The flexible sensor of claim 7 or 8, wherein, The main body portion has a holding portion which holds the front end portion of the detection body which is inserted, at an end portion thereof on the opposite side of the insertion passage from the guide portion.

11. The flexible sensor of claim 6, wherein, The main body portion has a holding portion which holds the front end portion of the detection body which is inserted, at an end portion thereof on the opposite side of the insertion passage from the guide portion.

12. The flexible sensor of claim 7, 8, or 9, wherein, The main body portion has a holding portion which holds the front end portion of the detection body which is inserted, at an end portion thereof on the opposite side of the insertion passage from the guide portion.

13. The flexible sensor of claim 10, wherein, including:

14. A measuring device, characterized by the flexible sensor according to any one of claims 1 to 13; and a measurement portion which measures a physical quantity of the measurement object based on a detection signal detected by the flexible sensor. ​

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