JP2006343178A - Bobbin for magnetic field sensors, magnetic field sensor using the bobbin, and magnetic field measurement apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bobbin for magnetic field sensor capable of winding, without enlarging coil diameter and also coinciding each axial line of the multi axial coils and capable of correctly detecting the magnetic field, and the magnetic field sensor, using the bobbin and a magnetic field measurement apparatus that uses the same. <P>SOLUTION: The bobbin is provided with approximately cubic shape bobbin body 12, each circular center of which is approximately coincide with the bobbin body 12, and under a positional relation of being perpendicular to each other, and the circumferential direction is three separately recessed grooves 13, 14 and 15 with bottom surfaces 13a, 14a and 15a. The bobbin 11 for magnetic field sensor is formed, such that the height of each groove bottom surface of each of grooves 13, 14 and 15 is not equal, on the bobbin 11 windings are performed for the magnetic field sensor, and the magnetic field measurement apparatus is formed, by providing the built-in magnetic sensor to the body of the measurement apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a magnetic field sensor bobbin that can accurately detect a magnetic field by matching the respective axes of a multi-axis coil, a magnetic field sensor using the same, and a magnetic field measuring instrument.

  Many magnetic field measuring instruments that measure magnetic flux or magnetic flux density require two or more axial directions of coils constituting a magnetic field sensor.

  FIG. 12 is an explanatory view showing an arrangement example of the coils when the axial direction of the coils is three axes of the X axis, the Y axis, and the Z axis, and the X axis coil 1, the Y axis coil 2, and the Z axis. For example, the working coil 3 is disposed on a substrate (not shown).

However, in the example shown in FIG. 12, since the center positions of the windings are different from each other, the windings are not orthogonal at the center and are unclear. Therefore, B _X and B _Y measured individually for each axis are used. , it is possible to obtain each value of B _Z from the respective center position even exact, those combined value obtained by the equation 1 for the center of the three axes as described above is unclear means There was a problem of becoming unclear.

FIG. 13 is a perspective view showing a bobbin disclosed in the following Patent Document 1 from the viewpoint of coping with such a problem. In this case, the bobbin 5 is orthogonal to the peripheral surface of the bobbin body 6 having a cylindrical shape. The grooves 7, 8, and 9 are formed in such a positional relationship, and windings (not shown) are applied to the grooves 7, 8, and 9, so that the magnetic field sensor can be used.
JP 2004-149308 A (refer to FIG. 2 in the same document)

  However, in the case of the bobbin 5 shown in FIG. 13, for example, even if there is no winding thickness between the winding of the groove 7 and the winding of the groove 8, There is a disadvantage in that the winding is thickened.

  Further, each of the grooves 7, 8, and 9 has a right angle, and there is a problem that when the winding is performed using a wire having a thin wire diameter, the groove is easily disconnected.

  In view of the above-mentioned problems found in the prior art, the present invention can perform winding without causing winding thickening, and accurately detects a magnetic field by aligning the axes of the multiaxial coils. An object of the present invention is to provide a magnetic field sensor bobbin that can be used, a magnetic field sensor using the bobbin, and a magnetic field measuring instrument.

  The present invention has been made to achieve the above object, and the first invention (bobbin for magnetic field sensor) of the present invention has a bobbin body portion having an appropriate three-dimensional shape, and the center of each of the bobbin body portions. A plurality of groove portions each having an annular groove bottom surface that is formed by recessing the circumferential direction of each of the groove portions in a substantially perpendicular relationship with each other, and each of the groove portions includes the groove. The main feature is that the bottom surface is formed with a height difference that makes the surface heights non-identical to each other.

  In this case, it is preferable that the bobbin main body portion is formed of a hexahedron having a substantially cubic shape, and each groove portion is formed with non-identical surface heights by changing the depth to the groove bottom. Further, the bobbin main body portion may be provided with a stepped flat portion in which each surface region adjacent to the opening surface of each groove portion is one step lower than the surface height of the other surface. Further, it is desirable that the bobbin main body is provided with marks for identifying the axial direction on three adjacent surfaces sharing one vertex among the six surfaces.

  Further, in the second invention (magnetic field sensor), any one of the above-described magnetic field sensor bobbins is used, and in each groove portion provided in the magnetic field sensor bobbin, the depth to the groove bottom is increased in order from the groove portion side so that the winding does not increase. The main feature is that the wire is wound and the winding is applied in the axial direction.

  In this case, the axis specified by the mark using the bobbin for a magnetic field sensor provided with the bobbin main body portion separately provided with marks for specifying the axial direction on three adjacent surfaces sharing one vertex. It is preferable that a winding is provided in each groove portion in relation to the direction and the winding order.

  A third invention (a magnetic field measuring device) includes the magnetic field sensor and a measuring device main body that includes a case portion that accommodates the magnetic field sensor and is freely formed to measure a magnetic field, and the case portion and the magnetic field sensor. The most important feature is that it is possible to freely form a fitting portion that can accommodate the magnetic field sensor only in a positional relationship that matches a predetermined axial direction.

  According to a fourth aspect of the present invention (magnetic field measuring instrument), the bobbin main body constituting the magnetic sensor bobbin according to claim 1 is provided in the circumferential direction in the longitudinal direction provided in a portion corresponding to the longitude line in the sphere. One groove part, the other groove part provided in the part corresponding to the longitude line at a position shifted by 90 degrees from the position of the groove part, and the lateral groove part provided in the part corresponding to the equator line in the sphere, respectively Provided with substantially the same center, and provided with recessed portions having the same shape in each of the four upper and lower regions, which are the remaining portions that define the groove portions and leave the side wall portions, and the bobbin A triaxial magnetic field sensor formed by winding each of the groove portions of the main body portion in a case portion divided into two parts having an internal structure that confronts each other to form a measuring device main body, and the measuring device The main body is opposed to the lower surface side of the case part. Through a base with a fitting support portion that matches the most important features that it has freely its stationary. In this case, the measuring instrument main body can be freely connected to other equipment via a cable.

  In each of the above-described magnetic field measuring instruments, it is preferable that a mark for identifying the axial direction of the magnetic field sensor is arranged on the surface of the case portion for each axial direction.

  According to the present invention, a relatively small magnetic field that can be wound without causing winding thickening and that can accurately detect a magnetic field by substantially matching the axes of the multiaxial coils. The sensor can be easily formed. Moreover, the magnetic field measuring device which can measure a magnetic field correctly, without shifting an axial direction by using this magnetic field sensor can be provided.

  FIG. 1 is an overall perspective view showing an example of a bobbin for a magnetic field sensor according to the first aspect of the present invention. According to the figure, the entire magnetic field sensor bobbin 11 is formed with a structure in which three axes of the X-axis, Y-axis, and Z-axis can be substantially aligned with each other.

  That is, the bobbin main body part 12 having a substantially cubic shape with an appropriate size, and the circumferential directions of the bobbin main body part 12 with the respective circular centers substantially coincide with each other and orthogonal to each other. Three groove portions 13, 14, and 15 having annular groove bottom surfaces 13a, 14a, and 15a formed by being recessed, and each of these groove portions 13, 14, and 15 has a groove bottom surface 13a, 14a, The surface heights of 15a are formed so as to have a height difference that is not identical to each other.

  More specifically, the bobbin main body portion 12 which is a hexahedron is recessed in the circumferential direction by equally dividing each of the four continuous surfaces as the circumferential surface in the vertical direction into two. The groove portion 13 in the X-axis direction that is continuous with the groove bottom surface 13a in an annular shape, and the Y-axis direction in which the groove bottom surface 14a is similarly formed in an annular shape under the positional relationship orthogonal to the groove portion 13 in the vertical direction. The groove portions 14 and the groove portions 15 in the Z-axis direction are formed in the same manner, with the groove bottom surfaces 15a having an annular shape under the positional relationship orthogonal to the groove portions 13 and 14 in the lateral direction. FIG. 2 shows the configuration of each of the six surfaces when the magnetic field sensor bobbin 11 shown in FIG. 1 is set to the front side in the direction indicated by the arrow in FIG. The front side is the front view, the left side of the front view is the left side view, the right side of the front view is the right side view, the upper side of the front view is the top view, and the front view. The lower surface is a bottom view.

  In this case, the height difference between the groove bottom surfaces 13a, 14a, 15a of the three groove portions 13, 14, 15 is the lowest in the groove bottom surface 13a of the groove portion 13 in the X-axis direction, and the groove bottom surface of the groove portion 14 in the Y-axis direction. 14a is the next lowest, and the groove bottom surface 15a of the groove portion 15 in the Z-axis direction is the highest.

  The height difference between the groove bottom surfaces 13a, 14a, and 15a is such that when the winding is performed by winding the wire 22 in the groove portions 13, 14, and 15 as shown in FIG. It is appropriately set within a range that does not occur.

  The bobbin main body 12 is positioned on each surface area adjacent to the opening surfaces 13b, 14b, 15b of the groove portions 13, 14, 15; that is, on both sides of the opening surfaces 13b, 14b, 15b of the groove portions 13, 14, 15 The step portion is provided with a flat step portion 16 that is one step lower than the height of the remaining surface 12a. As a result, the opening surfaces 13b, 14b, 15b of the grooves 13, 14, 15 are concealed as shown in FIG. 6 by the conductive tape 23 such as a copper foil tape that is covered via the step flat portion 16. It will be shielded.

  Furthermore, the bobbin main body portion 12 is provided with marks 17 for specifying the axial direction on three adjacent surfaces sharing one vertex among the six surfaces. Specifically, referring to FIG. 1, the bobbin main body 12 has a left side surface, a right side surface, and an upper side surface that share one vertex and are adjacent to each other among the three exposed surfaces. Yes.

  Among these, one small hole 17a is used as a mark 17 indicating the X-axis direction in the surface region located in the upper left corner of the left side surface, and two small holes 17b are provided in the Y axis in the surface region located in the rear corner of the upper side surface. As a mark 17 indicating the direction, three small holes 17c are respectively provided as marks 17 indicating the Z-axis direction in the surface region located in the upper right corner of the right side surface.

  Next, if the magnetic field sensor 21 formed by winding the magnetic field sensor bobbin 11 having such a structure is described with reference to FIGS. 3 to 6, the magnetic field sensor bobbin 11 is configured. The bobbin main body portion 12 includes the three groove portions 13, 14, and 15 as already described.

  The depth of each of the groove portions 13, 14, 15 to the groove bottom surfaces 13a, 14a, 15a is the deepest at the groove bottom surface 13a of the groove portion 13 in the X-axis direction in which the mark 17 is shown as one small hole 17a, and the mark 17 is The groove bottom surface 14a of the Y-axis direction groove portion 14 shown as two small holes 17b is the next deepest, and the groove bottom surface 15a of the Z-axis direction groove portion 15 whose mark 17 is shown as three small holes 17c is the shallowest. Thus, winding can be performed in the order of the X-axis direction → the Y-axis direction → the Z-axis direction in each of the groove portions 13, 14, 15 so as not to cause thickening.

  For example, the winding of the wire 22 made of a polyurethane conducting wire having a wire diameter of about 0.09 mm, for example, first confirms the mark 17 indicating the X-axis direction by one small hole 17a and confirms the groove portion in the X-axis direction in FIG. 13 is then performed on the groove 14 in the Y-axis direction by confirming the mark 17 indicating the Y-axis direction by the two small holes 17b, and finally the Z-axis by the three small holes 17c. This is performed on the groove 15 in the Z-axis direction by confirming the mark 17 indicating the direction.

  The winding direction of the wire 22 in that case is as follows. When the surface on which the mark 17 is located is the left side as shown in FIG. 4A, the right side is the axial direction, and FIG. As shown in FIG. 5, the winding is performed in a left-handed manner, for example, with an aligned winding and a winding number of about 100 turns.

  Thus, after winding in order to each groove part 13,14,15, as shown in FIG. 5, the starting end side and termination | terminus side of the wire 22 are twisted in substantially twisted shape, and each lead wire 22a, Take out as 22b and 22c. After that, as shown in FIG. 6, the conductive tape 23 is made non-conductive at the intersecting portions 24 with an appropriate insulating material interposed therebetween, and then the openings of the grooves 13, 14, 15 are opened through the step flat portion 16. By covering the surfaces 13b, 14b, and 15b so as to close the surfaces, the triaxial magnetic field sensor 21 according to the second invention is formed. In addition, the code | symbol 25 in FIG. 6 shows the wire which consists of a polyurethane conducting wire etc. which were connected and connected to each conductive tape 23 according to an axial direction.

  FIG. 7 is an exploded perspective view showing an example of the magnetic field measuring instrument according to the third aspect of the invention, and FIG. 8 is an overall perspective view showing a state after the assembly.

  According to these figures, the magnetic field measuring device 31 includes the magnetic field sensor 21 shown in FIG. 3 or FIG. 4 and a case main body portion 33 that accommodates the magnetic field sensor 21 and is freely formed to measure the magnetic field. The measuring instrument main body 32 is formed such that the base end side thereof can be freely connected to the grip operation unit 42.

  In this case, the measuring instrument main body 32 is composed of a lower housing part 34 and an upper housing part 37 which are divided into two parts so as to be freely combined. An upper surface is opened at the distal end side of the lower housing part 34. The lower case part 35 is provided with an upper case part 38 whose lower surface is opened at the tip of the upper casing part 37. The lower case part 35 and the upper case part 38 are opened to each other. The case main body portion 33 is formed by combining the sides so as to face each other.

  In addition, the magnetic field sensor 21 needs to be correctly accommodated in the case main body 33 with its axial direction oriented in a predetermined direction. For this reason, as shown in FIG. 9, it is provided on the inner bottom surface 35a of the lower case part 35 on the opposing surface of the bobbin main body part 12 constituting the magnetic field sensor bobbin 11 when the magnetic field sensor 21 is accommodated. Three protrusions 36 that are fitted to the respective recesses 18 are provided upright. Similarly, as shown in FIG. 9, four protrusions 39 that mate with the respective recesses 19 provided on the opposing surface of the bobbin main body 12 are suspended from the inner top surface 38 a of the upper case portion 38. Yes.

  If this is explained based on the correspondence between FIG. 2 and FIG. 9, the three concave portions 18 included in the surface shown as the right side view in FIG. 2 protrude from the inner bottom surface 35 a of the lower case portion 35. The four recesses 19 that are fitted to the three projections 36 that are provided separately and that are provided on the surface shown as the left side view in FIG. 2 are suspended from the inner top surface 38 a of the upper case portion 35. By fitting the four projections 36 separately, the fitting portions 28 are formed on the upper and lower sides thereof.

  As described above, the magnetic field sensor 21 and the case main body 33 are asymmetric or mirror symmetrical, and the magnetic field sensor 21 is placed in the correct positional relationship only when the fitting portions 28 are formed vertically. There is a fitting relationship that can be accommodated in the portion 33.

  In addition, the magnetic field sensor 21 is not only housed in the case body 33 with the correct positional relationship in this way, but is also shown in FIGS. 7 and 8 at the corresponding portion of the surface of the case body 33. As shown, the mark 40 for specifying the axial direction of the magnetic field sensor 21 is, for example, an X character mark 40a with an X character on the surface indicating the X-axis direction, and a surface indicating the Y-axis direction. A Y character mark 40b with a Y character is arranged on the surface indicating the Z-axis direction as a Z character mark 40c with a Z character in the axial direction.

  On the other hand, FIG. 10 is an overall perspective view showing an example of a magnetic field measuring instrument according to the fourth invention. The bobbin main body constituting the magnetic field sensor bobbin (not shown) is shifted by 90 degrees from one groove provided in the circumferential direction in the longitudinal direction provided in a portion corresponding to the longitude line in the sphere, and the position of the groove. The other groove provided in the portion corresponding to the longitude line of the position and the groove in the lateral direction provided in the portion corresponding to the equator line in the sphere are provided with their respective centers approximately coincident, and these groove portions are It is formed by providing recessed portions of the same shape in each of the upper and lower four regions, which are the remaining portions where the side wall portion is defined.

  That is, in this case, the bobbin main body (not shown) is formed with an appearance such that ten characters are drawn in the circles when viewed from either the top, bottom, left or right direction. The relationship between the groove portions of the bobbin main body portion is the same as that of the groove portions 13, 14, 15 of the bobbin main body portion 12 shown in FIG.

  Further, a triaxial magnetic field sensor (not shown) formed by winding each groove of the bobbin main body is housed in a case part 53 that can be divided into two parts and has an internal structure facing the magnetic field sensor. Thus, it is used as the measuring instrument main body 52. In this case, the case portion 53 includes a curved projecting portion 54 that projects in a rib shape at a portion in which each groove portion of the bobbin main body portion is accommodated, and the bobbin main body portion in each of the four upper and lower regions other than the curved projecting portion 54 Each of the four upper and lower regions is formed with each concave portion provided under the same shape and each concave portion 55 provided so as to face each other.

  Moreover, the measuring instrument main body 52 having such a structure introduces a fitting support portion 57 that faces the lower surface portion of the case portion 53, that is, each curved protrusion 54 located on the lower surface side, and rolls it. The magnetic field measuring instrument 51 is formed through a base 56 provided with a receiving groove 58 that is difficult to support, and can be placed freely. Note that the measuring instrument main body 52 can be freely connected to other equipment 60 via a cable 59 as shown in FIG.

  The present invention has been described with reference to the illustrated example, and the specific contents thereof are not limited thereto. For example, the magnetic field sensor bobbin can be formed by providing a groove that can correspond to a biaxial structure or a multiaxial structure of four or more axes. Further, the bobbin main body may have an appropriate three-dimensional shape other than a cubic shape as long as the groove bottom surface of the groove portion has an annular shape. Furthermore, the groove bottom surface of each groove portion may have an annular shape other than an annular shape, for example, an ellipse or an oval shape.

  Further, the bobbin main body portion can be formed without providing the step flat portion 16 as shown in FIG. 1 near the opening of the groove portion, and the groove portion may not be covered or covered with the conductive tape. Further, the mark 17 can be formed with an appropriate fitting structure other than a small hole, and the mark 40 may be a significant appropriate mark other than letters.

The whole perspective view showing an example of the bobbin for magnetic field sensors concerning the 1st invention. Explanatory drawing which shows each surface configuration example of 6 surfaces at the time of making the magnetic field sensor bobbin shown in FIG. 1 into the front view the arrow direction shown in the figure. Explanatory drawing which illustrates the axial direction at the time of forming the magnetic field sensor which concerns on 2nd invention using the bobbin for magnetic field sensors shown in FIG. It is explanatory drawing which shows an example of the coil | winding processing method performed after an axial direction is decided, of which (a) is the winding direction of the wire around the bobbin for magnetic field sensors, (b) is the winding direction and axis of the wire. The relationship with the direction is shown respectively. The perspective view which illustrates the state of the magnetic field sensor which concerns on 2nd invention after performing the procedure shown in FIG. The perspective view which illustrates the state which performed the electrostatic shielding process further with respect to the magnetic field sensor in the state of FIG. The perspective view which decomposes | disassembles and shows an example of the magnetic field measuring device which concerns on 3rd invention. The whole perspective view shown in the state which assembled the magnetic field measuring device shown in FIG. Explanatory drawing shown in the state which divided into 2 the internal structure of the case part in which the magnetic field sensor in the magnetic field measuring device shown in FIG. 8 is accommodated. The perspective view which shows an example of the magnetic field measuring device which concerns on 4th invention. The perspective view which shows the other examples of the magnetic field measuring device which concerns on 4th invention. Explanatory drawing which shows an example of the conventional coil typically. The perspective view which shows the bobbin currently disclosed by patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Magnetic field sensor bobbin 12 Bobbin main body part 12a Surface 13, 14, 15 Groove parts 13a, 14a, 15a Groove bottom face 13b, 14b, 15b Opening surface 16 Step flat part 17 Mark 17a, 17b, 17c Small hole 18, 19 Recessed part 21 Magnetic field sensor 22 Wire material 22a, 22b, 22c Lead wire 23 Conductive tape 24 Intersection 25 Wire material 28 Fitting portion 31 Magnetic field measuring device 32 Measuring device main body 33 Case main body portion 34 Lower housing portion 35 Lower case portion 35a Inner bottom surface 36 Projection 37 Upper side Case part 38 Upper case part 38a Inner top surface 39 Projection 40 Mark 40a X letter 40b Y letter 40c Z letter 42 Grip operation part 51 Magnetic field measuring instrument 52 Measuring instrument main body 53 Case part 54 Curved projection part 55 Recessed part 56 Base 57 Fitting support 58 Receiving groove 59 Cable 60 Other equipment

Claims (10)

A bobbin main body portion having an appropriate three-dimensional shape, and an annular groove bottom surface formed by recessing the circumferential direction of each bobbin main body portion so that the centers thereof substantially coincide with each other and are orthogonal to each other. A plurality of grooves having
Each of these groove portions is formed with a height difference in which the heights of the groove bottom surfaces are not identical to each other, and is formed for a magnetic field sensor bobbin.   2. The bobbin for a magnetic field sensor according to claim 1, wherein the bobbin main body portion is a hexahedron having a substantially cubic shape, and each groove portion has a height difference to the groove bottom surface by changing the depth to the groove bottom. .   3. The bobbin for a magnetic field sensor according to claim 2, wherein the bobbin main body portion is provided with a step flat portion in which each surface region adjacent to the opening surface of each groove portion is one step lower than the surface height of the other surface.   The bobbin for a magnetic field sensor according to claim 2 or 3, wherein the bobbin main body portion is provided with marks for specifying the axial direction on three adjacent surfaces sharing one vertex among the six surfaces. . The bobbin for a magnetic field sensor according to any one of claims 2 to 4, is used.
A magnetic field sensor characterized in that in each groove provided in the bobbin for a magnetic field sensor, a wire is wound in order from the groove part side where the depth to the groove bottom is deep without winding, and windings are applied in the axial direction.   The magnetic field sensor according to claim 5, wherein the magnetic field sensor bobbin according to claim 4 is used, and winding is applied to each groove portion in association with an axial direction specified by the mark and a winding order. The magnetic field sensor according to claim 5 or 6, and a measuring instrument body that includes a case portion that accommodates the magnetic field sensor and is freely formed to measure a magnetic field,
The magnetic field measuring instrument is characterized in that it can freely form a fitting portion that can accommodate the magnetic field sensor only in a positional relationship that matches a predetermined axial direction between the case portion and the magnetic field sensor. . The bobbin main body constituting the magnetic field sensor bobbin according to claim 1 includes one groove portion provided in a circumferential direction in a longitudinal direction provided in a portion corresponding to a longitude line in a sphere, and 90 from the position of the groove portion. The other groove portion provided in the portion corresponding to the longitude line of the position shifted by a distance and the lateral groove portion provided in the portion corresponding to the equator line in the sphere are provided with their respective centers substantially coincided with each other. While forming the groove part and forming the recessed part of the same shape in each of the upper and lower each 4 regions that are the remaining parts that left the side wall part,
A triaxial magnetic field sensor formed by separately winding each of the groove portions of the bobbin main body portion is housed in a case portion divided into two with an internal structure that is face-to-face matched to form a measuring instrument main body,
The measuring device main body can be freely placed through a base having a fitting support portion facing the lower surface portion side of the case portion.   The magnetic field measuring device according to claim 8, wherein the measuring device main body can be freely connected to other equipment via a cable. The magnetic field measuring instrument according to any one of claims 7 to 9, wherein a mark for specifying the axial direction of the magnetic field sensor is provided on the surface of the case portion in the axial direction.

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