JP2015114163A - Magnetic characteristic measurement instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic characteristic measurement instrument which can use an annular test piece as it is when measuring magnetic characteristics of the annular test piece and does not need to manually wind an excitation coil and a detection coil around the annular test piece each time when measuring the magnetic characteristics.SOLUTION: A test piece case 1 comprises: an upper case 10 made of an insulating material and provided with a first annular recess 17 for housing an annular test piece 30 made of a magnetic material; and a lower case 20 made of an insulating material and combined with the upper case 10 so as to close an opening of the first annular recess 17. An excitation coil and a detection coil wound around an outer periphery of the test piece 30 are constituted of a first excitation coil pattern 11 and a first detection coil pattern 12 of the upper case 10 and a second excitation coil pattern 21 and a second detection coil pattern 22 of the lower case 20.

Description

  The present invention relates to a magnetic property measuring apparatus for measuring magnetic properties of an annular test piece made of a magnetic material.

  As an example of a method for measuring the magnetic properties of a magnetic material, a measuring method in which an excitation coil (primary winding) and a detection coil (secondary winding) are wound around an annular test piece and a change in magnetic flux density in an applied magnetic field is measured. Is known. In such a measuring method, it is necessary to manually wind the excitation coil and the detection coil around the ring test piece, and it is necessary to wind the coil uniformly and densely, which is a heavy burden. If the excitation coil and the detection coil are removed after the measurement, the excitation coil and the detection coil must be wound around the ring test piece again when measurement is required again.

  As an example of the prior art aiming to solve such problems, a plurality of sample storage units for slidingly storing each of a plurality of sample pieces in which an annular measurement object is divided in the circumferential direction, and sample storage An annular sample magnetic property measuring apparatus is known that includes a connection part for magnetically connecting a plurality of sample pieces housed in a part, and an excitation coil and a detection coil wound around the outer periphery of the sample storage part (for example, a patent) Reference 1). According to such a conventional technique, it is not necessary to manually wind the excitation coil and the detection coil around the annular test piece every time the magnetic characteristic is measured, so that the work load when measuring the magnetic characteristic of the test piece is reduced. can do.

JP 2007-139717 A

  However, in the above-described prior art, the annular test piece cannot be used as it is, and it is necessary to divide the annular test piece into a plurality of pieces, and furthermore, a connection such as a U-shaped cut core for connecting the plurality of sample pieces. A member is also required. In other words, the above-described conventional technique has a problem that it takes a lot of labor to manufacture a test piece prepared when measuring the magnetic properties of a magnetic material.

  In view of such circumstances, the present invention has been made. The purpose of the present invention is to measure the magnetic properties of an annular test piece, and the annular test piece can be used as it is. It is an object of the present invention to provide a magnetic property measuring apparatus that does not require manual winding of an excitation coil and a detection coil around an annular test piece.

<First Aspect of the Present Invention>
A first aspect of the present invention is a first member that is formed of an insulating material and is provided with an annular recess that accommodates an annular test piece formed of a magnetic material, and an insulating material. A second member that is formed and combined with the first member so as to close the opening of the annular recess, and the first member is connected to each of the plurality of first terminals and each of the plurality of first terminals. A plurality of first conductive paths connected to each other, and the second member is connected to each of the plurality of first terminals in combination with the first member; A plurality of second conductive paths connected to each of the second terminals, and in a state where the first member and the second member are combined, the plurality of first conductive paths and the plurality of second conductive paths Excitation wound around the outer periphery of the annular test piece accommodated in the annular recess by the conductive path. Coil and the detection coil constitute a magnetic characteristic measuring apparatus.

  In the first aspect of the present invention, the plurality of first terminals of the first member and the plurality of second terminals of the second member are respectively connected by combining the first member and the second member. Thereby, the plurality of first conductive paths of the first member and the plurality of second conductive paths of the second member are respectively connected. The plurality of first conductive paths and the plurality of second conductive paths constitute an excitation coil and a detection coil wound around the outer periphery of the annular test piece. That is, the magnetic property measuring apparatus according to the present invention is an excitation wound around the outer periphery of the annular test piece simply by combining the first member and the second member in a state where the annular test piece is accommodated in the annular recess. A coil and a detection coil can be configured.

  Thus, according to the first aspect of the present invention, when measuring the magnetic properties of the annular test piece, the annular test piece can be used as it is, and the excitation coil and the detection are detected each time the magnetic property is measured. The effect of providing a magnetic property measuring apparatus that does not require the coil to be manually wound around an annular test piece can be obtained.

<Second Aspect of the Present Invention>
According to a second aspect of the present invention, in the first aspect of the present invention described above, one of the first terminal and the second terminal is a male terminal, and the other is a female to which the male terminal is fitted. This is a magnetic characteristic measuring device that is a terminal.
According to the second aspect of the present invention, in a state where the first member and the second member are combined, the plurality of first conductive paths of the first member and the plurality of second conductive paths of the second member are reliably provided. While being able to connect, the state which combined the 1st member and the 2nd member can be held firmly.

<Third Aspect of the Present Invention>
According to a third aspect of the present invention, in the first aspect or the second aspect of the present invention described above, the plurality of first conductive paths are conductor patterns formed on a surface of the first member, The plurality of second conductive paths is a magnetic property measuring apparatus that is a conductor pattern formed on the surface of the second member.
According to the third aspect of the present invention, since the first conductive path and the second conductive path are formed by the conductor pattern, the excitation coil and the detection coil wound uniformly and densely around the outer periphery of the annular test piece Can be configured easily. Moreover, according to the 3rd aspect of this invention, since the 1st conductive path and the 2nd conductive path are formed with the conductor pattern, reducing a possibility that a disconnection etc. may arise in a 1st conductive path or a 2nd conductive path. In addition, the magnetic property measuring apparatus according to the present invention can be mass-produced at a low cost.

  According to the present invention, when measuring the magnetic properties of an annular test piece, the annular test piece can be used as it is, and the excitation coil and the detection coil are converted into an annular test piece each time the magnetic properties are measured. It is possible to provide a magnetic property measuring apparatus that does not require manual winding.

The perspective view of a test piece case. The perspective view which looked at the state which isolate | separated the test piece case from the upper case side. The perspective view which looked at the state which isolate | separated the test piece case from the lower case side. The top view which expanded and illustrated a part of test piece case. The block diagram of the apparatus which measures the magnetic characteristic of an annular | circular shaped test piece by the exciting current method.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, this invention is not specifically limited to the Example demonstrated below, It cannot be overemphasized that a various deformation | transformation is possible within the range of the invention described in the claim.

  FIG. 1 is a perspective view of the test piece case 1. FIG. 2 is a perspective view illustrating a state in which the upper case 10 and the lower case 20 are separated from each other, and is a perspective view as viewed from the upper case 10 side. FIG. 3 is a perspective view illustrating a state where the upper case 10 and the lower case 20 are separated from each other, and is a perspective view viewed from the lower case 20 side.

  A test piece case 1 as a “magnetic characteristic measuring apparatus” according to the present invention includes an upper case 10 and a lower case 20.

  The upper case 10 as the “first member” is formed of an insulating material such as plastic, for example, and includes a plurality of first excitation coil patterns 11, a plurality of first detection coil patterns 12, and a first input terminal 13. , First output terminal 14, second input terminal 15, second output terminal 16, first recess 17, a plurality of inner male terminals 18, and a plurality of outer male terminals 19.

  The plurality of first excitation coil patterns 11 and the plurality of first detection coil patterns 12 as “a plurality of first conductive paths” are a plurality of conductor patterns formed on the surface of the upper case 10. More specifically, the plurality of first excitation coil patterns 11 and the plurality of first detection coil patterns 12 are a plurality of conductor patterns respectively formed from the inner surface to the upper surface and the outer surface of the upper case 10. The first excitation coil pattern 11 and the first detection coil pattern 12 are alternately formed one by one in the circumferential direction. The 1st input terminal 13, the 1st output terminal 14, the 2nd input terminal 15, and the 2nd output terminal 16 are formed in the upper surface of upper case 10, for example, are lands which can connect an electric wire etc. by soldering. The plurality of inner male terminals 18 as “a plurality of first terminals” are provided at the opening end inside the first recess 17, and one end side of each of the first excitation coil pattern 11 and the first detection coil pattern 12 is a pair. Connected with one. A plurality of outer male terminals 19 as “a plurality of first terminals” are provided at the opening ends outside the first recess 17, and the other end sides of the first excitation coil pattern 11 and the first detection coil pattern 12 are connected to each other. Each is connected on a one-to-one basis. The first concave portion 17 as an “annular concave portion” is an annular concave portion in which the annular test piece 30 is accommodated.

  The lower case 20 as the “second member” is formed of an insulating material such as plastic, for example, and includes a plurality of second excitation coil patterns 21, a plurality of second detection coil patterns 22, and an annular second A recess 23, a plurality of inner female terminals 24, and a plurality of outer female terminals 25 are included.

  The lower case 20 is a member constituting the test piece case 1 in a state combined with the upper case 10. Here, the combined state of the upper case 10 and the lower case 20 means that the upper case 10 and the lower case 20 are combined so as to close the opening of the first recess 17 of the upper case 10, and the upper case 10 and the lower case 20 are combined. And the test piece case 1 together. More specifically, the opening end inside the first recess 17 of the upper case 10 and the opening end inside the second recess 23 of the lower case 20 abut, and the opening outside the first recess 17 of the upper case 10. The state which the edge and the open end of the outer side of the 2nd recessed part 23 of the lower case 20 contact | abutted is said. In the state where the upper case 10 and the lower case 20 are combined, the test piece case 1 is formed by an annular first recess 17 of the upper case 10 and an annular second recess 23 of the lower case 20. An annular space in which the piece 30 is accommodated is formed inside.

  The plurality of second excitation coil patterns 21 and the plurality of second detection coil patterns 22 as “a plurality of second conductive paths” are a plurality of conductor patterns formed on the surface of the lower case 20. More specifically, the plurality of second excitation coil patterns 21 and the plurality of second detection coil patterns 22 are a plurality of conductor patterns formed from the inner surface to the upper surface and the outer surface of the lower case 20, respectively. The second excitation coil pattern 21 and the second detection coil pattern 22 are alternately formed one by one in the circumferential direction.

  A plurality of inner female terminals 24 as “a plurality of second terminals” are provided at the inner opening end of the second recess 23, and one end side of each of the second excitation coil pattern 21 and the second detection coil pattern 22 is a pair. Connected with one. The plurality of inner female terminals 24 are fitted with the plurality of inner male terminals 18 of the upper case 10 in a state where the upper case 10 and the lower case 20 are combined. Accordingly, the plurality of inner female terminals 24 are connected to each of the plurality of inner male terminals 18 of the upper case 10. A plurality of outer female terminals 25 serving as “a plurality of second terminals” are provided at the outer opening end of the second recess 23, and the other end sides of the second excitation coil pattern 21 and the second detection coil pattern 22 are connected to each other. Each is connected on a one-to-one basis. The plurality of outer female terminals 25 are fitted with the plurality of outer male terminals 19 of the upper case 10 in a state where the upper case 10 and the lower case 20 are combined. Thereby, the plurality of outer female terminals 25 are connected to each of the plurality of outer male terminals 19 of the upper case 10.

  In the state where the upper case 10 and the lower case 20 are combined, the test piece case 1 is brought into an internal annular space by the first excitation coil pattern 11 of the upper case 10 and the second excitation coil pattern 21 of the lower case 20. An exciting coil L1 wound around the outer periphery of the accommodated annular test piece 30 is configured. In addition, the test piece case 1 has an annular space inside by the first detection coil pattern 12 of the upper case 10 and the second detection coil pattern 22 of the lower case 20 in a state where the upper case 10 and the lower case 20 are combined. The detection coil L2 wound around the outer periphery of the annular test piece 30 accommodated in the is formed. Hereinafter, a more specific description will be given with reference to FIG.

  FIG. 4 is an enlarged plan view showing a part of the test piece case 1.

  One end side of the first exciting coil pattern 11 a of the upper case 10 is connected to the first input terminal 13 of the upper case 10. On the other hand, the other end side of the first excitation coil pattern 11 a of the upper case 10 is connected to the outer male terminal 19 a of the upper case 10. The outer male terminal 19 a of the upper case 10 is fitted to the outer female terminal 25 a of the lower case 20. One end side of the second exciting coil pattern 21 a of the lower case 20 is connected to the outer female terminal 25 a of the lower case 20. That is, the other end side of the first excitation coil pattern 11 a of the upper case 10 is connected to one end side of the second excitation coil pattern 21 a of the lower case 20.

  The other end side of the second excitation coil pattern 21 a of the lower case 20 is connected to the inner female terminal 24 b of the lower case 20. The inner female terminal 24 b of the lower case 20 is fitted to the inner male terminal 18 b of the upper case 10. One end of the first exciting coil pattern 11b of the upper case 10 is connected to the inner male terminal 18b of the upper case 10. That is, the other end side of the second excitation coil pattern 21 a of the lower case 20 is connected to one end side of the first excitation coil pattern 11 b of the upper case 10.

  The other end side of the first excitation coil pattern 11 b of the upper case 10 is connected to the outer male terminal 19 c of the upper case 10. The outer male terminal 19 c of the upper case 10 is fitted to the outer female terminal 25 c of the lower case 20. One end side of the second exciting coil pattern 21b of the lower case 20 is connected to the outer female terminal 25c of the lower case 20. That is, the other end side of the first excitation coil pattern 11 b of the upper case 10 is connected to one end side of the second excitation coil pattern 21 b of the lower case 20.

  The other end side of the second excitation coil pattern 21 b of the lower case 20 is connected to the inner female terminal 24 d of the lower case 20. The inner female terminal 24 d of the lower case 20 is fitted to the inner male terminal 18 d of the upper case 10. One end of the first exciting coil pattern 11c of the upper case 10 is connected to the inner male terminal 18d of the upper case 10. That is, the other end side of the second excitation coil pattern 21 b of the lower case 20 is connected to one end side of the first excitation coil pattern 11 c of the upper case 10.

  The other end side of the first excitation coil pattern 11 c of the upper case 10 is connected to the outer male terminal 19 e of the upper case 10. The outer male terminal 19e of the upper case 10 is fitted to the outer female terminal 25e of the lower case 20. One end of the second exciting coil pattern 21c of the lower case 20 is connected to the outer female terminal 25e of the lower case 20. That is, the other end side of the first excitation coil pattern 11 c of the upper case 10 is connected to one end side of the second excitation coil pattern 21 c of the lower case 20.

  The other end side of the second excitation coil pattern 21 c of the lower case 20 is connected to the inner female terminal 24 f of the lower case 20. The inner female terminal 24 f of the lower case 20 is fitted to the inner male terminal 18 f of the upper case 10. One end of the first exciting coil pattern 11d of the upper case 10 is connected to the inner male terminal 18f of the upper case 10. That is, the other end side of the second excitation coil pattern 21 c of the lower case 20 is connected to one end side of the first excitation coil pattern 11 d of the upper case 10.

  In this way, the test piece case 1 includes a plurality of first excitation coil patterns 11 of the upper case 10 and a plurality of second excitation coil patterns 21 of the lower case 20 in a state where the upper case 10 and the lower case 20 are combined. Are alternately connected in series. As a result, the test piece case 1 is configured with an exciting coil L1 wound around the outer periphery of the annular test piece 30 accommodated in the inner annular space. More specifically, the test piece case 1 has one excitation coil L1 having one end connected to the first input terminal 13 of the upper case 10 and the other end connected to the second input terminal 15 of the upper case 10. Will be composed.

One end side of the second detection coil pattern 22a of the lower case 20 is finally passed through the outer female terminal 25 of the lower case 20, the outer male terminal 19 of the upper case 10, and the first detection coil pattern 12 of the upper case 10. It is connected to the first output terminal 14 of the upper case 10 (not shown).
The other end side of the second detection coil pattern 22 a of the lower case 20 is connected to the inner female terminal 24 a of the lower case 20. The inner female terminal 24 a of the lower case 20 is fitted to the inner male terminal 18 a of the upper case 10. One end side of the first detection coil pattern 12 a of the upper case 10 is connected to the inner male terminal 18 a of the upper case 10. That is, the other end side of the second detection coil pattern 22 a of the lower case 20 is connected to one end side of the first detection coil pattern 12 a of the upper case 10.

  The other end side of the first detection coil pattern 12 a of the upper case 10 is connected to the outer male terminal 19 b of the upper case 10. The outer male terminal 19 b of the upper case 10 is fitted to the outer female terminal 25 b of the lower case 20. One end side of the second detection coil pattern 22b of the lower case 20 is connected to the outer female terminal 25b of the lower case 20. That is, the other end side of the first detection coil pattern 12 a of the upper case 10 is connected to one end side of the second detection coil pattern 22 b of the lower case 20.

  The other end side of the second detection coil pattern 22 b of the lower case 20 is connected to the inner female terminal 24 c of the lower case 20. The inner female terminal 24 c of the lower case 20 is fitted to the inner male terminal 18 c of the upper case 10. One end side of the first detection coil pattern 12b of the upper case 10 is connected to the inner male terminal 18c of the upper case 10. That is, the other end side of the second detection coil pattern 22 b of the lower case 20 is connected to one end side of the first detection coil pattern 12 b of the upper case 10.

  The other end of the first detection coil pattern 12 b of the upper case 10 is connected to the outer male terminal 19 d of the upper case 10. The outer male terminal 19 d of the upper case 10 is fitted to the outer female terminal 25 d of the lower case 20. One end side of the second detection coil pattern 22c of the lower case 20 is connected to the outer female terminal 25d of the lower case 20. That is, the other end side of the first detection coil pattern 12 b of the upper case 10 is connected to one end side of the second detection coil pattern 22 c of the lower case 20.

  The other end side of the second detection coil pattern 22 c of the lower case 20 is connected to the inner female terminal 24 e of the lower case 20. The inner female terminal 24e of the lower case 20 is fitted to the inner male terminal 18e of the upper case 10. One end of the first detection coil pattern 12c of the upper case 10 is connected to the inner male terminal 18e of the upper case 10. That is, the other end side of the second detection coil pattern 22 c of the lower case 20 is connected to one end side of the first detection coil pattern 12 c of the upper case 10.

  The other end side of the first detection coil pattern 12 c of the upper case 10 is connected to the outer male terminal 19 f of the upper case 10. The outer male terminal 19 f of the upper case 10 is fitted to the outer female terminal 25 f of the lower case 20. One end of the second detection coil pattern 22d of the lower case 20 is connected to the outer female terminal 25f of the lower case 20. That is, the other end side of the first detection coil pattern 12 c of the upper case 10 is connected to one end side of the second detection coil pattern 22 d of the lower case 20.

  Thus, in the state where the upper case 10 and the lower case 20 are combined, the test piece case 1 includes a plurality of first detection coil patterns 12 of the upper case 10 and a plurality of second detection coil patterns 22 of the lower case 20. Are alternately connected in series. As a result, the test piece case 1 is configured with a detection coil L2 wound around the outer periphery of the annular test piece 30 accommodated in the inner annular space. More specifically, the test piece case 1 has one detection coil L2 having one end connected to the first output terminal 14 of the upper case 10 and the other end connected to the second output terminal 16 of the upper case 10. Will be composed.

  As described above, the test piece case 1 according to the present invention includes a circular first concave portion 17 provided in the upper case 10 and an annular second concave portion 23 provided in the lower case 20. An excitation coil L1 and a detection coil wound around the outer periphery of the annular test piece 30 simply by combining the upper case 10 and the lower case 20 with the annular test piece 30 accommodated in the annular inner space. L2 can be configured. Therefore, according to the test piece case 1 according to the present invention, when measuring the magnetic characteristics of the annular test piece 30, the annular test piece 30 can be used as it is, and each time the magnetic characteristics are measured. There is no need to manually wind the excitation coil L1 and the detection coil L2 around the annular test piece 30.

  In the test piece case 1 according to the present invention, either the “first terminal” of the upper case 10 and the “second terminal” of the lower case 20 are male terminals (inner male terminals) as in the above-described embodiment. 18 and outer male terminal 19), and the other is preferably a female terminal (inner female terminal 24, outer female terminal 25) into which the male terminal fits. Thereby, in a state where the upper case 10 and the lower case 20 are combined, the plurality of first excitation coil patterns 11 of the upper case 10 and the plurality of second excitation coil patterns 21 of the lower case 20 can be reliably connected to each other. In addition, the plurality of first detection coil patterns 12 of the upper case 10 and the plurality of second detection coil patterns 22 of the lower case 20 can be reliably connected to each other. Further, the combined state of the upper case 10 and the lower case 20 can be firmly held.

  In the test piece case 1 according to the present invention, the “plurality of first conductive paths” of the upper case 10 is a conductor pattern (first excitation coil pattern) formed on the surface of the upper case 10 as in the above-described embodiment. 11, the first detection coil pattern 12). Similarly, the “plurality of second conductive paths” of the lower case 20 are conductor patterns (second excitation coil pattern 21, second detection coil pattern 22) formed on the surface of the lower case 20, as in the above-described embodiment. ) Is preferred. Thereby, the excitation coil L1 and the detection coil L2 wound uniformly and densely on the outer periphery of the annular test piece 30 can be easily configured. Further, for example, as compared with the case where the “first conductive path” of the upper case 10 or the “second conductive path” of the lower case 20 is formed of electric wires, the possibility of disconnection or the like can be reduced, and the present invention can be reduced. Such test piece case 1 can be mass-produced at low cost.

  In the above embodiment, an example in which the annular inner space is formed in the test piece case 1 by the first concave portion 17 of the upper case 10 and the second concave portion 23 of the lower case 20 has been described. 20, without providing the second recess 23, the lower case 20 can be an annular flat plate, and the test piece case 1 can be configured with an annular inner space only by the first recess 17 of the upper case 10. The present invention can also be implemented in such an embodiment. In the above embodiment, the annular test piece 30 has been described as an example. However, for example, when measuring the magnetic properties of the rectangular test piece 30, the shape of the test case 1 and the upper case 10 are adjusted accordingly. What is necessary is just to determine the shape of the 1st recessed part 17, the shape of the 2nd recessed part 23 of the lower case 20, etc.

  FIG. 5 illustrates the configuration of an apparatus for measuring the magnetic properties of an annular test piece 30 by an excitation current method as an example of a method for measuring the magnetic properties of a magnetic material using the test piece case 1 according to the present invention. It is a block diagram.

  As described above, the test piece case 1 has an annular shape accommodated in an inner annular space by the plurality of first excitation coil patterns 11 of the upper case 10 and the plurality of second excitation coil patterns 21 of the lower case 20. The exciting coil L1 wound around the outer periphery of the test piece 30 is configured. The exciting coil L <b> 1 has one end connected to the first input terminal 13 and the other end connected to the second input terminal 15. The first input terminal 13 and the second input terminal 15 of the test piece case 1 are connected to the power supply device 40.

  Further, as described above, the test piece case 1 is accommodated in the inner annular space by the plurality of first detection coil patterns 12 of the upper case 10 and the plurality of second detection coil patterns 22 of the lower case 20. A detection coil L2 wound around the outer periphery of the annular test piece 30 is configured. The detection coil L <b> 2 has one end connected to the first output terminal 14 and the other end connected to the second output terminal 16. The first output terminal 14 and the second output terminal 16 of the test piece case 1 are connected to the magnetometer 50. The magnetometer 50 is connected to the power supply device 40, and a drive signal for the exciting coil L <b> 1 is output from the magnetometer 50 to the power supply device 40.

  For example, the strength of the magnetic field acting on the test piece 30 is obtained from the number of turns of the exciting coil L1 and the current i. Further, the magnetic flux density of the test piece 30 is obtained from the number of turns and the cross-sectional area of the detection coil L2 and the magnetic flux detected by the detection coil L2. Thereby, the magnetic properties of the test piece 30 can be measured.

DESCRIPTION OF SYMBOLS 1 Test piece case 10 Upper case 11 1st excitation coil pattern 12 1st detection coil pattern 13 1st input terminal 14 1st output terminal 15 2nd input terminal 16 2nd output terminal 17 1st recessed part 18 1st inner side male terminal 19 First outer male terminal 20 Lower case 21 Second excitation coil pattern 22 Second detection coil pattern 23 Second recess 24 Second inner female terminal 25 Second outer female terminal 30 Test piece 40 Power supply device 50 Magnetometer L1 Excitation coil L2 Detection coil

Claims (3)

A first member formed of an insulating material and provided with an annular recess for receiving an annular test piece formed of a magnetic material;
A second member formed of an insulating material and combined with the first member so as to close the opening of the annular recess,
The first member includes a plurality of first terminals and a plurality of first conductive paths connected to each of the plurality of first terminals.
The second member includes a plurality of second terminals connected to each of the plurality of first terminals in combination with the first member, and a plurality of second terminals connected to each of the plurality of second terminals. A conductive path,
In a state where the first member and the second member are combined, the coil is wound around the outer periphery of the annular test piece accommodated in the annular recess by the plurality of first conductive paths and the plurality of second conductive paths. A magnetic characteristic measuring device comprising an excitation coil and a detection coil.   2. The magnetic property measuring apparatus according to claim 1, wherein one of the first terminal and the second terminal is a male terminal, and the other is a female terminal into which the male terminal is fitted. .   3. The magnetic property measuring apparatus according to claim 1, wherein the plurality of first conductive paths are conductor patterns formed on a surface of the first member, and the plurality of second conductive paths are the second conductive paths. A magnetic property measuring apparatus, which is a conductor pattern formed on the surface of a member.

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