JP2009135523A - Coil and current sensor using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil which is formed with a good pitch accuracy and a high pitch, and is inexpensively manufactured, and also to provide a current sensor using the coil. <P>SOLUTION: A coil is constituted of: an insulating base 1 comprising a flat shaped insulating body 1c having approximately Z-shaped plurality of conductors 6 formed on a reference surface on one side, with center sides pattern-formed at equal intervals so as to be parallel with each other, and an insulating film 1d disposed in such a manner as superposing on the insulating body 1c to cover each conductor 6; coil lines 2, with a conductor 5 formed on the insulating film 1d, for electrically connecting one end and the other end of the two adjacent conductors 6, in a zig-zag form by conductor 6 and conductor 5; and an output terminal provided on the reference surface in the vicinity of the coil lines 2, for respectively connecting a start end and a terminal end of the coil lines 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air-core coil used for electrical, electronic components, magnetic detection sensors, and the like, and a current sensor using the coil.

  An air-core coil is advantageous in that it has no iron core and is light in weight and is not saturated by the iron core. A typical air-core coil is a Rogowski coil. This Rogowski coil is used as a current detection coil in place of a current sensor such as a current transformer (CT) that has been used in the past to measure not only the main breaker but also each branch breaker in the distribution board. As a result, a current sensor capable of detecting even a large current with a wide dynamic range utilizing the point without saturation of the iron core, which is the feature of the sensor, has been realized.

  The Rogowski coil will be described with an example in which a torus-shaped winding with an air core is used to return through the center of the coil. In the case of this Rogowski coil, when the current penetrating the coil changes, a voltage is induced at both ends of the coil by electromagnetic induction, thereby functioning as a current detection coil.

  More specifically, the output voltage V of the Rogowski coil is obtained by differentiating the current to be measured flowing through the electric wire to be measured, and is expressed by the following equation. If this output voltage V is integrated, a current waveform can be obtained.

  Here, I is the current to be measured, S is the cross-sectional area of the Rogowski coil, μ0 is the vacuum permeability, and N is the number of turns per unit length of the Rogowski coil.

  Since the output voltage V obtained by this equation is multiplied by μ0 (= 4π × 10−7) as a coefficient, for example, a general load current (several A˜) flowing through each breaker of the distribution board as described above, for example. When trying to detect this, the voltage becomes very small. In order to increase the output voltage V, the number of turns N per unit length of the coil and the coil cross-sectional area S may be increased. However, when a Rogowski coil is used as the current detection coil, a primary current flows. In order to suppress the influence by the penetration position of an electric wire, it is necessary to suppress the winding pitch variation and to wind with high accuracy.

  In recent years, as an air-core coil (Rogowski coil) structure that solves the above-mentioned problems, both sides of the printed circuit board are connected and patterned to form a coil by connecting the back side and the front side with through holes. The structure which forms a coil is proposed (for example, patent documents 1).

JP 2003-50254 A (FIG. 1, paragraph numbers 0039 to 0040)

  By the way, in the coil using the printed circuit board as disclosed in the above-mentioned Patent Document 1, although the pitch variation accuracy may be compared with the coil winding, the connection of the front and back of the printed board is made every turn. In order to carry out through holes, there are many processes such as drilling and plating, and the cost is high. In addition, the through hole requires a land in the range, which hinders the fine pitch.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a coil having good pitch accuracy, capable of forming a high pitch, and capable of being manufactured at low cost, and a current sensor using the coil. It is to provide.

  In order to achieve the above object, according to the first aspect of the present invention, a flat plate in which a plurality of substantially Z-shaped first conductors that are patterned at equal intervals so that the central sides are parallel are formed on one plate surface. And an insulating base composed of an insulating thin film disposed on the plate surface of the insulator so as to cover the first conductors, and the two adjacent firsts A second conductor that electrically connects one end of the other conductor and the other end of the other conductor is formed on the surface of the insulating thin film so that the first conductor and the second conductor meander. The coil line section is configured, and the first and second output terminals are provided on the plate surface in the vicinity of the coil line section and connect the start end and the end of the coil line section, respectively.

  According to the invention of the coil of claim 1, since the processing is performed only on one side of the insulating base, it is not necessary to align the front and back as in the case of a double-sided substrate using a conventional through hole, and the manufacture becomes easy. In addition, the back surface of the insulating base can be used for other purposes, and the land necessary for providing the above-mentioned through hole is unnecessary, and the pitch can be made finer, and further deformation is possible. By forming the part with a mold for forming an insulating base, for example, the distance between the deformed parts can be improved, and since the structure is simple, the yield is good and it can be manufactured at low cost. In particular, a conductor pattern can be formed on a flat insulator by sequentially performing insulating thin film lamination and conductor pattern formation, thereby enabling multilayer coil formation.

  According to a second aspect of the present invention, there is provided a Rogowski coil using the coil of the first aspect, wherein the insulating base is formed in a cylindrical shape and the end of the coil line portion is returned to the start end side by the coil rewind line portion. Thus, a current detection coil is provided.

  According to the invention of the current sensor of claim 2, a current sensor provided with a current detection coil that can be miniaturized with high accuracy, low cost, by the Rogowski coil utilizing the features of the coil of claim 1. it can.

  According to a third aspect of the present invention, there is provided a current sensor according to the second aspect, wherein a conductor foil is attached to the back surface of the insulating base to form a shield portion, and the termination of the coil line portion is provided via the coil rewind line portion. The second output terminal for connecting is electrically connected to the conductor foil.

  According to the invention of the current sensor of claim 3, it is possible to prevent the commercial noise electrostatic noise from being generated by the shield portion of the conductor foil due to the electrostatic coupling between the wiring and the coil line portion.

  According to a fourth aspect of the current sensor of the present invention, in the third aspect of the present invention, the terminal of the coil line portion is connected to the conductor foil, and the output terminal is electrically connected to the conductor foil in the vicinity of the start end of the coil line portion. The conductor foil is used as a coil rewinding line portion.

  According to the fourth aspect of the current sensor of the present invention, the coil rewinding line portion of the Rogowski coil is also used as the conductor foil of the shield portion, so that the configuration can be made useless.

  The invention of claim 5 is characterized in that, in the invention of claim 3 or 4, a plurality of strips of insulation are formed in parallel with the conductor foil.

  According to the invention of the current sensor of claim 5, it is possible to suppress the generation of eddy current when the magnetic flux from the outside is linked to the conductor foil of the shield part, and hence the nonuniform potential difference caused by the eddy current is caused. It is possible to prevent a decrease in shielding performance.

  The invention of claim 6 is characterized in that, in the invention of claim 2, 3 or 5, the coil rewinding line and the coil line part of the coil line part are formed in the same shape.

  According to the current sensor of the sixth aspect, there is an effect that a disturbance magnetic field can be effectively prevented.

  In the invention of the current sensor of claim 7, in the invention of claim 6, the formation position of the coil line portion and the formation position of the rewinding line are shifted in the both end directions of the deforming portion so that both lines are parallel to each other. The coil line section and the rewind line are wound in the same direction.

  According to the invention of the current sensor of claim 7, a disturbance magnetic field can be effectively prevented, and the coil line portion and the coil rewind line portion can be formed on the same surface, which is easy to manufacture. In addition, an improvement in accuracy of the penetration position of the electric wire through which the current to be measured flows can be expected.

  According to an eighth aspect of the current sensor of the present invention, in the second aspect of the present invention, a ground conductor is provided on the surface of the insulating base between the first and second conductors parallel to both ends of the deformed portion. It is formed so as to be parallel to the conductor.

  According to the invention of the current sensor of claim 8, it is possible to perform the pattern formation of the ground conductor that can be expected to have a shielding effect simultaneously with the patterning of the conductor of the coil line portion. Can be reduced.

  According to a ninth aspect of the current sensor of the present invention, in the eighth aspect of the invention, the ground conductors are alternately formed on the surface of the deformed portion and the plate surface portion of the insulating base between the adjacent deformed portions. And

  According to the current sensor of the ninth aspect, an effect of preventing electrostatic noise on both the plate surface serving as the reference surface and the deformed portion can be expected.

  Since the present invention is processing only on one side of the insulating base, it is not necessary to align the front and back as in the case of a double-sided substrate using a conventional through hole, and manufacturing is facilitated. It can be used for other purposes, and the land that was necessary when providing a through hole is no longer required. Therefore, the pitch can be made finer, and the insulating mold is formed simultaneously with the same mold. By forming the deformed portion, the interval between the deformed portions can be improved with accuracy, and the structure is simple, so that the yield is good and the coil can be manufactured at low cost, and the current using the coil. A sensor can be provided.

FIG. 10 is an explanatory diagram of the manufacturing process of the eighth embodiment. It is a perspective view which can omit a part of reference example 1. 2A is a cross-sectional view taken along the line AA in FIG. 2, FIG. 2B is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 10 is a perspective view of an insulating base used in a modification of Reference Example 1. FIG. The insulation base used for another modification of the reference example 1 is shown, (a) is a perspective view, (b) is a plane sectional view. 10 is a plan view of an insulating base used in another modification of Reference Example 1. FIG. The another conductor formation example of the reference example 1 is shown, (a) is a perspective view which a part fracture | rupture abbreviate | omits, (b) is an expansion perspective view same as the above. (A) is sectional drawing of the example of another insulation base used for the reference example 1, (b) is sectional drawing of the example of another insulation base used for the reference example 1. FIG. The example using the other insulation base of Embodiment 1 is shown, (a) is a perspective view which can be abbreviate | omitted partially broken, (b) is CC sectional drawing of (a). FIG. 3 is a perspective view of a part of Embodiment 1 that can be omitted. 2 is a circuit configuration diagram of a current sensor according to Embodiment 1. FIG. 6 is a schematic diagram of a modified example of the first embodiment. FIG. (A) is a schematic diagram of Embodiment 2, (b) is a schematic diagram of Embodiment 3, (c) is a schematic diagram of Embodiment 4. FIG. FIG. 9 shows a fifth embodiment, in which (a) is a schematic view, and (b) is a perspective view that can be partially omitted. Embodiment 6 is shown, in which (a) is a schematic view and (b) is a perspective view that can be partially omitted. FIG. 9 shows a seventh embodiment, where (a) is a schematic view and (b) is a perspective view that can be partially omitted. It is a disassembled perspective view which a part of reference example 2 can abbreviate | omit.

  Embodiments of the present invention will be described below.

(Reference Example 1)
As shown in FIG. 2, the coil of this reference example forms a coil line portion 2 meandering on the plate surface (front surface) side of a flat insulating base 1 made of a non-magnetic material and an insulating resin molded product. Thus, the pair of output terminals 3a and 3b of the coil line portion 2 are provided on the plate surfaces near the pair of diagonal portions of the insulating base near the coil line portion 2, respectively.

  The insulating base 1 has a plurality of deformed portions 4 that are displaced in a concave shape (groove shape) with the flat plate surface of the insulating base 1 as a reference surface in the longitudinal direction so that the longitudinal directions are parallel to each other at equal intervals. The line portion 2 is formed on the insulating base 1. That is, the plate surface portion of the insulating base 1 between the first conductor 5 formed on the surface (inner surface) between the longitudinal ends of each deformed portion 4 as shown in FIG. As shown in FIG. 3B, the first end of the first conductor 5 of the deformable portion 4 on one side adjacent to one end and the first of the deformable portion 4 on the other side adjacent to the other end are formed. A connecting conductor having a second conductor 6 extended so as to be electrically connected to the other end of the conductor 5 and having a serpentine shape as a whole, and an end of the conductor 5 on the start end side formed on the reference plane An end of the terminal-side conductor 5 is electrically connected to the second output terminal 3b via a connecting conductor 6b formed on the reference plane, to the first output terminal 3a via 6a.

  And the center through-hole which is an air core of a coil is formed because the space | interval of the height difference of the bottom face of the deformation | transformation part 4 and the board surface which is a reference plane continues in the longitudinal direction of the insulating base 1. FIG.

  Here, the pattern of the first conductor 5 is formed by ink jet printing (or a stamping method) capable of patterning by ejecting conductive ink on the inner surface of the deformed portion 4, and is formed on the plate surface of the insulating base 1. The conductor 6 and the connecting conductors 6a and 6b are formed by an etching method capable of patterning with a copper foil. Of course, the second conductors 6, 6a, 6b may be formed of conductive ink.

  When patterning by the above-described ink jet printing is performed, it is necessary to provide a gradient in the printing site so that the printing site of the deformable portion 4 is as perpendicular as possible to the ejection direction of the conductive ink in order to ensure the patterning. By adopting ink jet printing, the patterning width can be reduced to about several tens of μm, so that patterning with a margin for the shape of the deformed portion 4 is possible.

  As a result, the conductor can be easily formed in the deformed portion 4, and the resistance value of the coil line portion is increased only with the conductive ink having a low conductivity. By forming 6a and 6b with a highly conductive copper foil, the resistance value of the coil line portion can be kept low, and the ease of manufacture and the securing of good electrical characteristics can be achieved simultaneously.

  Thus, in the present reference example, the coil line portion 2 can be formed by processing only the one side plate surface (front surface) side of the insulating base 1. Further, by forming the deformable portion 4 by a mold for molding the insulating base 1, the interval between the deformable portions 4 can be improved. Further, as described above, if the inner surfaces of the longitudinal ends of the deformable portion 4 are inclined to be inclined (gradient) in order to ensure the patterning by ink jet printing, the boundary portion (edge portion) between the deformable portion 4 and the reference surface is formed. Conductor breakage does not easily occur, and the yield can be improved. Furthermore, instead of forming a gradient on the inner surfaces at both ends, the entire inner surface in the direction of both ends of the deformed portion 4 is a gentle R surface as shown in FIG. As a result, conductor breakage can be similarly prevented. In the case where breakage is unlikely to occur due to the conductive material, the inner surfaces at both ends of the deformable portion 4 may naturally be surfaces that rise vertically from the bottom surface, and the present invention is not limited to the formation on the gradient or the R surface.

  In the coil of FIG. 2, the insulating base 1 remains flat, but the insulating base 1 is formed of a flexible insulating resin molded body and has a cylindrical shape so that both ends are abutted as shown in FIG. Thus, a toroidal coil can be formed.

  Further, as shown in FIGS. 5A and 5B, the insulating base 1 is constituted by an insulating resin molded product formed into a cylindrical shape, and the front or back surface, which is a flat plate surface of the insulating base 1, is used as a reference plane. The toroidal coil is formed even if the coil line portion 2 is formed by forming the deformed portions 4 similar to those described above at equal intervals in the circumferential direction and providing the conductors 5 and 6 similar to the case of FIG. be able to.

  Further, the insulating base 1 is formed in an annular shape as shown in FIG. 6, the deformed portions 4 are formed at equal intervals in the circumferential direction on the reference surface, and the conductors 5 and 6 similar to those in FIG. Even if the line portion 2 is formed, a toroidal coil can be realized.

  In the case of FIG. 2, the conductors 5, 6, 6a and 6b are wide patterns, but they may be formed in a linear pattern as shown in FIGS. 7 (a) and 7 (b). In this case, as described above, the fine conductors 5, 6, 6a, and 6b may be formed by conductive ink using ink jet printing. Also in this case, the conductor 5 is formed with a conductive ink pattern, and the conductors 6, 6a, 6b are formed with a copper foil pattern formed by an etching method, thereby ensuring ease of manufacturing and the coil line portion. An increase in the resistance value can also be suppressed. Of course, the conductors 6, 6a, 6b may be formed of conductive ink.

  When the conductor 5 is formed on the bottom surface of the deformable portion 4 with conductive ink, the cross-sectional shape of the bottom surface of the deformable portion 4 is V-shaped as shown in FIGS. A U-shaped pattern forming guide groove 7 is formed, so that the conductive ink can be collected in the groove 7 when the conductor 5 is formed by the conductive ink, and therefore, it is difficult to break due to stress such as bending. The conductor 5 can be formed, and the positional accuracy of patterning can be increased. In FIG. 8, a similar pattern formation guide groove 7 'is also provided on the plate surface (reference surface) on which the conductor 6 is formed corresponding to the case where the conductor 6 is also formed of conductive ink.

  Further, in the case of FIG. 2, the conductor 6 is formed on the reference surface of the insulating base 1 between the deformed portions 4 and 4 so as to be parallel to the conductor 5 of the deformed portion 4. ), A convex deformation portion 40 may be formed between the deformation portions 4 and 4, and the conductor 6 may be formed in the longitudinal direction of the deformation portion 40. In this configuration, the cross-sectional area of the air core portion of the coil can be increased with a small height difference with respect to the reference surface of the insulating base 1 serving as the reference surface. The conductor 6 formed in the deformed portion 40 is formed by patterning by spraying conductive ink by ink jet printing, and facilitates patterning on the convex surface. Even in the deformed portion 40, the conductor 6 is prevented from being broken by providing gradients (or R surfaces) on both end faces.

(Embodiment 1)
The reference example 1 described above is a general air-core coil, but a so-called Rogowski coil, which is one of air-core coils, is configured, and this Rogsky coil is used as a current sensor. It is an embodiment.

  Here, the Rogowski coil of this embodiment arrange | positions the 1st, 2nd output terminals 3a and 3b in the one end side of the insulation base 1, as shown in FIG. The terminal side of the coil line part 2 is connected to the output terminal 3a and the second output is connected to the terminal side of the coil line part 2 via the coil rewind line part 8 formed on one reference surface of the insulating base 1 so as to be parallel to the coil line part 2. This is connected to the terminal 3b.

  The insulating base 1 may be a flexible insulating resin molded body (for example, as long as it has flexibility, can easily form the deformed portion 4 and can perform conductor patterning, and a thermoplastic resin is particularly suitable. 11), the coil line part 2 from which the charging part is exposed as shown in FIG. 11 is set inside, and the ends of the coil line part 2 are aligned so that both ends of the insulating base 1 partially overlap each other. The current detection coil A made of a Rogowski coil is formed by bending into a shape. When actually used to protect the coil line part 2 from which the charging part of the coil line part 2 is exposed, the coil line part 2 may be put in a protective structure.

  The conductor of the coil rewinding line portion 8 is formed of copper foil by the etching method together with the conductors 6 and 6a. Of course, these conductors 6 and 6a may be formed of conductive ink. Since the other configuration is the same as the configuration of Reference Example 1, the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 11 shows the configuration of the entire current sensor using the above-described current detection coil A. The integration circuit 9a integrates the output voltage from the output terminals 3a and 3b of the current detection coil A, and the integration output is detected by the sensor. A signal processing unit 9 including an amplifier circuit 9b that amplifies the voltage according to the specification is provided, and a detection output restored to a current waveform corresponding to the current detected by the current detection coil A is output. Since the output voltage of the current detection coil A, which is a Rogowski coil, is very small, a twisted pair shielded wire or the like is used for the connection between the current detection coil A and the signal processing circuit unit 9 in order to prevent the influence of external noise. Ideally, it is desirable that the current detection coil A and the signal processing circuit unit 9 be integrated to eliminate the connection line.

  Further, in order to increase the sensitivity as the current detection coil A, the interval between the parallel conductors 5 and 6 is made as small as possible, and the depth from the reference surface of the concave deformed portion 4 (the convex deformed portion described later). In some cases, the higher the height), the greater the output voltage and the better the sensitivity. For example, the distance is set to 200 μm, the depth of the deformed portion 4 of the insulating base 1 is set to 100 μm, the length of the deformed portion 4 in both longitudinal directions is set to 20 mm, and rounded into a cylindrical shape to form a toroidal coil type current detection coil A. In this case, a voltage of about 3.9 μV / A (when the frequency on the primary side is 50 Hz) is generated. In this case, the size of the insulating base 1 is suitably, for example, 100 mm × 25 mm and the thickness is 0.2 mm. Of course, the size of the insulating base 1 is changed in accordance with the physical conditions such as the shape of the place where the current detection coil A is installed and the external conditions in which the coil is used, such as the diameter of the primary wire passing therethrough. can do.

  Further, the insulating base 1 may be formed in a cylindrical shape as shown in FIG. Further, the current detection coil A may not be cylindrical but may be an annular shape as shown in FIG. Further, as the shape of the deformed portion 4, a configuration as shown in FIGS. 4A and 4C is adopted, and a configuration using a pattern formation guide groove 7 as shown in FIGS. 8A and 8B is adopted. Also good. Furthermore, a linear conductor pattern as shown in FIG. 7 may be adopted. Furthermore, an insulating base 1 having a configuration as shown in FIG. 9 may be used.

  As shown in FIG. 12, the coil rewinding line portion 8 is formed in the center of the back surface of the insulating base 1 in the longitudinal direction, and the terminal of the coil line portion 2 on the surface side of the insulating base 1 is connected to one end thereof through a through hole. Then, the output terminal 3b on the surface side of the insulating base 1 may be connected to the other end through a through hole. In FIG. 12, the coil line portion 2 is schematically shown. However, the first and second conductors 5 and 6 constituting the coil line portion 2 and the structure of the connection configuration are in accordance with the first embodiment.

(Embodiment 2)
By the way, when used as the current detection coil A of the current sensor as in the first embodiment, the influence of electrostatic noise must be taken into consideration. Therefore, in the present embodiment, as shown in FIG. 13A, a conductor foil 10 is attached to the back surface of the insulating base 1 corresponding to the site where the coil line portion 2 is formed to constitute a shield portion. Then, the end of the coil rewinding line portion 8 on the ground side output terminal 3 b side is electrically connected to the conductor foil 10 on the back side using the through hole 11 formed in the insulating base 1.

  Thus, in the present embodiment, the influence of electrostatic noise can be eliminated by the shield portion made of the conductive foil 10, and the back surface of the insulating base 1 where the coil line portion 2 is not provided can be effectively utilized.

  Although the coil line portion 2 is schematically shown in FIG. 13A, the structure of the first and second conductors 5 and 6 and the connection configuration constituting the coil line portion 2 is the same as in Reference Example 1. To do.

(Embodiment 3)
In the second embodiment, the coil rewinding line portion 8 is formed on the surface side of the insulating base 1, but in this embodiment, the end of the coil line portion 2 is connected to the through hole 12a as shown in FIG. Using the through hole 12b, the other end of the conductor 6c having one end connected to the output terminal 3b is electrically connected to the center of the end portion of the conductor foil 10 positioned on the back surface on one end side in the longitudinal direction of the insulating base 1. By electrically connecting to the center of the end portion of the conductor foil 10 located on the back surface on the other end side in the longitudinal direction of the insulating base 1, the conductor foil 10 constituting the shield portion is also used as the coil rewinding line portion. Yes.

  Thus, in the present embodiment, the influence of electrostatic noise can be eliminated by the conductor foil 10, and it is not necessary to pattern the coil rewinding line portion.

  In addition, although the coil line part 2 is typically shown in FIG.13 (b), the structure of the 1st, 2nd conductors 5 and 6 which comprise the coil line part 2, and a connection structure shall follow a reference example 1. To do.

(Embodiment 4)
In the second and third embodiments, the shield portion is formed by the conductor foil 10 on the back surface of the insulating base 1, but an eddy current is generated in the conductor foil 10 due to the magnetic field penetrating the conductor foil 10, and there is a risk of noise increase. In the present embodiment, as shown in FIG. 13C, a plurality of cuts 13 are formed in parallel in the longitudinal direction, and the cuts 13 provide an insulation effect against eddy currents to reduce noise. That is, noise is prevented from being generated due to a potential difference caused by eddy current.

  In addition, although this embodiment utilizes the structure of Embodiment 3 which comprised the coil rewinding line | wire part with the conductor foil 10, it is needless to say that the notch 13 may be made with respect to the conductor foil 10 of Embodiment 2.

(Embodiment 5)
In the first and second embodiments, the coil rewinding line portion 8 and the coil line portion 2 to be configured as a Rogowski coil are formed on the same surface (front surface) of the insulating base 1, but in this embodiment, FIG. As shown in a), the coil unwinding line portion 8 is formed on the same surface side in the same shape as the coil line portion 2 and shifted in the short direction of the insulating base 1 so as to be parallel to the coil line portion 2. Thus, there is no need to use a through hole or the like, and the effect of preventing a disturbance magnetic field is increased.

  FIG. 14A schematically shows the configuration of the line portion. In this embodiment, however, the concave deformed portion 4 is actually formed when the insulating base 1 is formed as shown in FIG. A convex deformed portion 40 is formed between the adjacent deformed portions 4 and 4 so as to protrude upward with the reference surface of the insulating base 1 as a reference surface, and the deformed portions 4 are alternately turned into coil rewind lines. The conductor 80 forming part of the part 8 and the forming part of the first conductor 5 of the coil line part 2 are used, and the deformed part 40 is used as the conductor 80 'forming part of the coil return line 8 and the coil line part 2 2 is used as a formation part of the second conductor 6.

  The conductors 5 and 6 are connected by the conductors 60 a and 60 b formed on the reference surface of the insulating base 1 to constitute the meandering coil line portion 2. Similarly, the conductors 80a and 80b formed on the reference surface of the insulating base 1 are connected between the bodies 80 and 80 'to constitute the meandering coil rewinding line portion 8.

  The conductors 5, 6 and 80, 80 'are both formed of a conductive ink pattern by an ink jet printing method. In this embodiment, the conductors 60a, 60b, 80a, and 80b are also formed by inkjet printing in order to simplify the process. However, a low resistance value may be achieved by forming the conductor 60a by a copper foil by an etching method.

(Embodiment 6)
As described above, in the second to fifth embodiments, the conductor foil 10 is used to form the shield portion. However, in the present embodiment, the coil return line portion 8 to the coil line portion 2 as shown in FIG. A shield line 81 interposed between the parallel conductors 5 and 6 is formed to extend, and a shield portion against electrostatic noise is configured by these shield lines 81 to take measures against electrostatic noise. Specifically, the shield line 81 is formed on the reference surface so as to be parallel to the second conductor 6 formed on the reference surface of the insulating base 1 as shown in FIG.

(Embodiment 7)
In the sixth embodiment, the shield line 81 extending from the coil return line portion 8 is interposed between the parallel conductors 5 and 6 of the coil line portion 2 from one side, but this embodiment is shown in FIG. As shown, a ground line portion 8 ′ is formed in parallel with the coil return line 8 on the reference surface of the insulating base 1 on the opposite side across the coil line portion 2 with respect to the coil return line portion 8. The shield line 81 ′ is also extended from the portion 8 ′ and interposed between the conductors 5 and 6 of the coil line portion 2 from the opposite direction to the shield line 81. The ground line portion 8 ′ is connected to the coil return line portion 8 in the vicinity of the output terminal 3b. Specifically, the shield line 81 ′ is formed so as to extend in parallel with the conductor 5 in the deformed portion 4 as shown in FIG.

(Reference Example 2)
The insulating base 1 of each of the embodiments and the reference example 1 is constituted by a single insulating resin molded product. In this reference example, the insulating base 1 is formed as a slit-like through-hole as shown in FIG. 14 are formed in parallel at equal intervals, and a Z-shaped second conductor extending from one end side of each through hole 14 to the other end side of the adjacent through hole via the surface adjacent to the through hole 14 in parallel. 6 is formed in parallel to the plate-like first insulator 1a, which is slightly longer than the length of the through hole 14 in the longitudinal direction, substantially the same as the width of the opening shape, and at the same interval as the interval of the through holes 14. The second insulator 1b is formed with a plurality of first conductors 5 formed on the surface, and each first conductor 5 corresponding to each through hole 14 of the first insulator 1a is exposed. In addition, one end of the first conductor 5 is connected to one end of the second conductor 6 adjacent to both sides, and the other The first insulator 1b is bonded to the back surface of the first insulator 1a so that the other end faces the other end, so that the through hole 14 and the insulator 1b serving as the bottom of the through hole 14 are used in the first embodiment. Concave-shaped deformed portions 4 similar to the above are formed.

  Here, the end portion of the second conductor 6 extends on the inclined surfaces (gradients) at both ends of each through-hole 14, and contacts the end portions of the conductor 5 when the insulators 1 a and 1 b are bonded together. However, in order to improve contact reliability, a conductive ink is applied to the electrical connection portion after bonding by ink jet printing to ensure electrical connection between the two.

  Here, also in this reference example, the coil return line 8 is wired to the insulator 1a in order to use the current detection coil A of the Rogowski coil. Moreover, in order to form in a cylindrical shape, the insulators 1a and 1b are both constituted by a flexible insulator. For example, the insulating base 1a provided with the through holes 14 is a film having a thickness of 200 μm, for example, and a polyimide film or the like can be used. The conductor 6 of the insulator 1a made of this insulating film can be formed of a copper foil using, for example, a sputtering method, or can be formed of a conductive ink using an ink jet printing method. Since the insulator 1b has a flat surface, the conductor 5 can be formed by a sputtering method, but patterning by etching, which is a method for forming a printed circuit board, is also possible. In this case, since the conductor 5 can be formed of a copper foil having a thickness of, for example, about 18 μm, if both the conductors 5 and 6 are formed of a copper foil, the resistance value of the coil line portion 2 can be made extremely low. Is possible. As materials for the two insulators 1a and 1b, in view of bonding, those having strong mutual adhesive strength and equivalent properties against deformation due to heat or the like are preferable.

  Although illustration of the output terminal is omitted in FIG. 17, the output terminal for connecting the start end of the coil line portion 2 and the end of the coil line portion 2 via the coil return line 8 are the same as in the case of the first embodiment. Are connected to the output terminal.

  Thus, in the coil according to the present reference example, it is difficult to reduce the distance between the conductors 5 and 6 due to the presence of the through-hole lands as in the case where the coil is formed using the double-sided substrate, but the structure as in the present reference example. Then, since a space such as a land is not required, the interval can be made fine.

(Embodiment 8)
In the present embodiment, the deformable portion 4 has a convex shape, and a plurality of substantially Z-shaped conductors that are patterned at equal intervals so that the central sides are parallel as shown in FIG. As shown in FIG. 1B, the flat insulator 1c formed on the surface serving as a reference surface on one side and the insulator 1c so as to cover other than both ends of each conductor 6 are insulated. An insulating film 1d, which is an insulating thin film constituting the base 1, and after bonding the insulating film 1d on the insulator 1c as shown in FIG. 1 (b), one end of one of the two adjacent conductors 6 A conductor 5 electrically connecting between the other end and the other end is formed by spraying a conductive ink onto the insulating film 1d by an ink jet printing method to form a conductor as shown in FIGS. 1 (c) and 1 (d). 5 and 6 constitute a meandering coil line section 2 It has become.

  Thus, in this embodiment, when the surface of the insulator 1c is used as a reference plane, only the thickness of the insulating film 1d is higher than the reference plane, and the insulating film 1d functions as a deformed portion.

  In this embodiment as well, a coil return line 8 is wired to the insulator 1a in order to use the current detection coil A as a Rogowski coil. Although the output terminal is not shown in FIG. 1, the output terminal for connecting the starting end of the coil line portion 2 and the end of the coil line portion 2 via the coil return line 8 are the same as in the case of the first embodiment. Are connected to the output terminal.

  Here, since the insulator 1c is formed of a flat insulating resin molding having a flat surface, the conductor 6 can be formed by a sputtering method or an etching method. Further, since the insulating film 1d has a flat surface, the conductor 5 can be formed by sputtering or the like in addition to the ink jet printing method.

1 Insulation base 1c Insulator 1d Insulation film (insulating thin film)
2 Coil line part 5 Conductor (second conductor)
6 conductor (first conductor)

Claims (9)

  A flat insulator in which a plurality of substantially Z-shaped first conductors patterned at equal intervals so that the central sides are parallel to each other are formed on one side of the plate surface, and so as to cover the first conductors An electrical insulation between an insulating base composed of an insulating thin film disposed on the plate surface of the insulator and one end and the other end of the two adjacent first conductors A coil line portion formed in a meandering manner by the first conductor and the second conductor formed on the surface of the insulating thin film, and the plate in the vicinity of the coil line portion A coil comprising a first output terminal and a second output terminal which are provided on a surface and which respectively connect a start end and a terminal end of the coil line portion.   Using the coil of claim 1, forming a Rogowski coil in which the insulating base is formed in a cylindrical shape and the terminal end of the coil line part is returned to the start end side by the coil rewinding line part to form a current detecting coil. Characteristic current sensor.   A conductor foil is attached to the back surface of the insulating base to form a shield portion, and a second output terminal that connects the terminal end of the coil line portion is electrically connected to the conductor foil via the coil rewind line portion. The current sensor according to claim 2, wherein:   The terminal end of the coil line part was connected to the conductor foil, the output terminal was electrically connected to the conductor foil in the vicinity of the starting end of the coil line part, and the conductor foil was used as a coil rewind line part. The current sensor according to claim 3.   5. The current sensor according to claim 3, wherein a plurality of strips of insulation are formed in parallel with the conductor foil.   6. The current sensor according to claim 2, wherein the coil rewind line and the coil line portion are formed in the same shape.   The formation position of the coil line portion and the formation position of the rewind line are shifted in the both end directions of the deformable portion so that both lines are parallel and the winding direction of the coil line portion and the rewind line is the same direction. The current sensor according to claim 6.   The ground conductor is formed on the surface of the insulating base between the first and second conductors parallel to both ends of the deformed portion so as to be parallel to the first and second conductors. Item 3. The current sensor according to Item 2.   9. The current sensor according to claim 8, wherein the ground conductors are alternately formed on the surface of the deformed portion and the plate surface portion of the insulating base between the adjacent deformed portions.

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