JP5639846B2 - 3-axis magnetic sensor - Google Patents

Description

  The present invention relates to a three-axis magnetic sensor for detecting magnetic field strengths in an X-axis direction, a Y-axis direction, and a Z-axis direction that are orthogonal to each other, and more particularly to a three-axis magnetic sensor suitable for detecting geomagnetism. Is.

  Conventionally, a three-axis magnetic sensor that detects magnetic field components in three axes of the X, Y, and Z axes orthogonal to each other is referred to as three magnetic sensor elements corresponding to the three axes (hereinafter referred to as “sensor elements”). ). In order to adjust the orthogonality between the detection axes of each sensor element, a 3-axis magnetic sensor is installed in a uniform magnetic field created by Helmholtz coils, etc., and each axis is detected while detecting the output voltage of the magnetic sensor of each axis. The fixing position of the sensor element is mechanically finely adjusted using screws or the like to adjust the orthogonality.

  FIG. 3 is a schematic perspective view of a conventional three-axis magnetic sensor product. The X-axis azimuth sensor element 11, the Y-axis azimuth sensor element 12, and the Z-axis azimuth sensor element 13 are adjusted so that their detection axes are orthogonal to each other. The fixing block 14 is fixed with mounting screws 15. Here, when the X-axis azimuth sensor element 11, the Y-axis azimuth sensor element 12, and the Z-axis azimuth sensor element 13 are attached to the fixing block 14, the dimensional center of each sensor element (hereinafter referred to as “sensor element of the sensor element”). (Referred to as “center”) must be arranged so as to be on the center axis 16a (hereinafter referred to as “center axis 16a”) on the dimension of the mounting surface of the fixing block 14 in three directions. And, when each sensor element is moved for adjustment, it is important to adjust the orthogonality without shifting the center of the sensor element from the center axis 16a as much as possible in order to reduce the adjustment man-hours.

  FIG. 4 is a schematic perspective view showing a state of the conventional triaxial magnetic sensor before screwing the X axis direction sensor element 11 and the fixing block 14. In adjusting the orthogonality of each sensor element, the mounting hole 17 of the X-axis azimuth sensor element 11 attached to the fixing block 14 is processed to be larger than the size of the mounting screw 15, and the X-axis is within the range of play. The direction sensor element 11 is rotated and finely adjusted, and a method of fixing with the mounting screw 15 is employed.

  FIG. 5A is a diagram when the center of the X-axis azimuth sensor element 11 is ideally rotated so as to coincide with the central axis 16a when adjusting the orthogonality. The screw hole for mounting the fixing block 14 is shown in FIG. 18, the mounting hole 17 rotates about the central axis 16 a as indicated by the arrow, so that the center of the X-axis orientation sensor element 11 does not vary.

  However, as described above, since the mounting hole 17 is processed to be larger than the size of the mounting screw 15, when the adjustment hole is actually adjusted and fixed, as shown in FIG. In some cases, the center of the X-axis azimuth sensor element 11 may be at a position 16b that is changed by an amount A in the drawing from the original center axis 16a. That is, since the center of the X-axis azimuth sensor element 11 is deviated from the center axis 16a which should be originally, the X-axis azimuth sensor element 11 cannot be fixed at an accurate position, and the deviation results in an adjustment error. . Therefore, there has been a drawback that a correction man-hour of readjustment is required to correct the adjustment error.

  As a means for solving this problem, Patent Document 1 describes a technique of providing a rotating plate between a sensor element and a fixing block.

  The fixed state of the sensor element in Patent Document 1 will be described with reference to FIG.

  The rotating plate 24 is provided with a cylindrical protrusion 25 at the center, and includes a holding claw 27 for fixing the sensor element 21. On the other hand, the sensor element 21 includes a holding recess 28 at a position where the sensor element 21 is fitted with the holding claw 27 of the rotating plate 24, and the fixing block 23 is used for inserting the columnar protrusion 25 of the rotating plate 24. A circular hole 29 is provided.

  The sensor element 21 and the rotating plate 24 are fixed in advance by a holding claw 27 and a holding recess 28, and the center of the sensor element 21 is centered by fitting the columnar protrusion 25 of the rotating plate 24 and the circular hole 29 of the fixing block 23. The rotating plate 24 can be rotated without fluctuation, and the mounting screw 31 is provided in the fixing block 23 through the mounting hole 22 of the sensor element 21 and the mounting hole 26 of the rotating plate 24 at an arbitrary position. By tightening and fixing in the mounting screw holes 30, the orthogonality of each sensor element can be adjusted more efficiently than the three-axis magnetic sensor having the configuration shown in FIG.

Utility Model Registration No. 2535764

  However, according to the technique of Patent Document 1, a part called a rotating plate is newly required between the sensor element and the fixing block. In general, when the number of parts increases, not only in terms of cost, but also increases the product weight of the finished product and the assembly process, so it is desirable that the number of parts is as small as possible.

  Accordingly, an object of the present invention is to provide a three-axis magnetic sensor that can be efficiently adjusted without changing the center of the sensor element during adjustment in the adjustment of the orthogonality of each sensor element, and is configured without increasing the number of parts. There is to do.

  The present invention examined the structure of a three-axis magnetic sensor so that the degree of orthogonality of each sensor element can be adjusted efficiently without increasing the number of components and without changing the center of the sensor element during adjustment. It is.

That is, the triaxial magnetic sensor of the present invention is a triaxial magnetic sensor in which three magnetic sensor elements corresponding to the three axial directions of the X axis, the Y axis, and the Z axis orthogonal to each other are combined and fixed . outer edges of the arc-shaped flange portion, the outer edges on the same side of the portion opposite to each other with respect to the winding, the magnetic sensor element formed integrally to project in a direction parallel to the axis of the winding, with at least a portion of the wall portion having an arcuate edge inscribed in the outer edge of the flange portion, to fix the magnetic sensor element, the solid-titration, block having a guide portion, the magnetic sensor element wherein with one or more attachment members for securing the fixing block, in the collar portion comprises an arcuate elongated hole capable of inserting the mounting only member, the elongated hole relative to the fixed block and A hole for inserting the mounting member is formed at a position where The outer edge of the recording part and the inner edge of the wall part come into contact with each other, and are arranged so as to be rotatable about the center of the arc of the wall part, and the magnetic sensor element is fixed using the mounting member at a desired rotational position. It is configured to be possible.

Further, the three-axis magnetic sensor of the present invention, the arc center of the wall portion, the center of the arc of the elongated hole, characterized in that on the central axis of rotation the magnetic sensor element.

  In the triaxial magnetic sensor of the present invention, the attachment member is an attachment screw, and the elongated hole is an arcuate groove.

In the three-axis magnetic sensor of the present invention, the guide portion is a circular recess.

In the triaxial magnetic sensor of the present invention, the guide portion is an oval concave portion.

The triaxial magnetic sensor according to the present invention is characterized in that the guide portion is a protruding portion.

  As described above, according to the present invention, in the orthogonality adjustment of the three-axis magnetic sensor, the conventional defect that the center of the sensor element fluctuates during the adjustment can be improved. In addition, a new component called a rotating plate is not used between the sensor element and the fixing block, which is advantageous in terms of cost due to the increase in the number of components, and further suppresses an increase in product weight and assembly process. be able to.

  That is, according to the present invention, it is possible to provide a three-axis magnetic sensor and a fixing device that can be efficiently adjusted without changing the center of the sensor element during adjustment and that are configured without increasing the number of components.

The schematic perspective view before the attachment of the sensor element of arbitrary directions and the fixing block in Embodiment 1 of the 3-axis magnetic sensor of this invention. FIG. 2 is a schematic perspective view of a sensor element having an arbitrary orientation and a fixing block according to the first embodiment of the three-axis magnetic sensor of the present invention. FIG. FIG. 2B is a plan view when the orthogonality adjustment is completed and the sensor element is fixed to the fixing block. The schematic perspective view of the product of the conventional triaxial magnetic sensor. The schematic perspective view before the attachment of the X-axis azimuth | direction sensor element and fixing block in the conventional triaxial magnetic sensor. FIG. 5A shows an X-axis azimuth sensor element in a conventional three-axis magnetic sensor, and FIG. 5A shows a case where the center of the X-axis azimuth sensor element coincides with the central axis of the mounting surface of the fixing block. FIG. 5B is an explanatory diagram when the center of the X-axis sensor element is displaced from the central axis of the mounting surface of the fixing block during rotation. The schematic perspective view before the attachment of the sensor element of the arbitrary directions in the conventional (patent document 1) triaxial magnetic sensor, a rotating plate, and a fixing block. The schematic perspective view of the block for fixation in Embodiment 2 of the triaxial magnetic sensor of this invention. The schematic perspective view of the block for fixation in Embodiment 3 of the triaxial magnetic sensor of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic perspective view of a sensor element and a fixing block in an arbitrary direction according to Embodiment 1 of the three-axis magnetic sensor of the present invention. The magnetic sensor is composed of a sensor element 1 and a flange 3 whose outer edge is arcuate. Further, the flange portion 3 is provided with an arc-shaped groove 2 having a groove width into which a mounting screw 6 can be inserted.

  On the other hand, the fixing block 4 is formed with a circular concave portion 5 which is a guide portion in which the arc-shaped outer edge of the flange portion 3 is inscribed when the sensor element 1 is assembled. The circular concave portion 5 is provided with a hole portion (mounting screw hole) 7 into which a mounting screw 6 for fixing the sensor element 1 is fixed at a position facing the arc-shaped groove 2 formed in the flange portion 3. It has been. The material of the mounting screw 6 is preferably nonmagnetic metal or plastic resin. The mounting screw 6 only needs to maintain a fixed state, and a rivet, a split pin or the like may be used in addition to the bolt.

  Here, the arc of the outer edge of the flange 3 and the center of the arc of the arc-shaped groove 2 exist on a perpendicular line (not shown) extending from the mounting surface side of the sensor element 1 so as to pass through the center of the dimension of the sensor element 1. The center of the inner diameter of the circular recess 5 of the fixing block 4 is on the central axis 8 of the mounting surface of the fixing block 14. Here, the sensor element 1 is described as a sensor element having an arbitrary orientation (for example, the X-axis orientation). However, as shown in FIG. 3, the other two axes (Y-axis orientation, Z-axis orientation) The center of the sensor element is also on the central axis of the mounting surface of the fixing block.

  FIG. 2A is a plan view when the sensor element of the present invention is incorporated in a fixing block and the orthogonality is adjusted. Since the sensor element 1 is inscribed in the circular recess 5 at the outer edge of the flange part 3, the center of the sensor element 1 can be rotated without being deviated from the central axis 8, and as shown in FIG. The sensor element 1 can be rotated to efficiently adjust the orthogonality, and the mounting screw 6 is screwed into the mounting screw hole 7 via the arc-shaped groove 2 formed in the flange 3. Thus, the sensor element 1 can be fixed to the fixing block 4 at a position where the output characteristics are good.

  Further, since the number of parts does not increase, it is possible to suppress an increase in product cost, product weight, and assembly man-hour.

  Although an arbitrary one axis has been described here, a triaxial magnetic sensor is completed by aligning the orthogonality of the sensor elements of each axis in the same manner.

  FIG. 7 is a schematic perspective view of a fixing block 32 having an arbitrary orientation according to the second embodiment of the three-axis magnetic sensor of the present invention, and a wall portion having an arcuate edge that is inscribed in the outer edge of the flange of the sensor element. Are formed at both ends. The sensor element is assembled and rotated in the oval recess 34, and the orthogonality can be adjusted efficiently as in the first embodiment, thereby completing the three-axis magnetic sensor.

  FIG. 8 is a schematic perspective view of a fixing block 33 having an arbitrary orientation according to the third embodiment of the three-axis magnetic sensor of the present invention, and a wall portion having an arcuate edge that is inscribed in the outer edge of the flange of the sensor element. The protrusion part 35 provided with is formed. The sensor element is assembled and rotated in the projecting portion 35, and the orthogonality can be adjusted efficiently in the same manner as in the first embodiment, so that a three-axis magnetic sensor is completed.

  Examples of the present invention are described in detail below.

  First, in order to carry out the present invention, as shown in FIG. The shape of the sensor element 1 was 26 mm in length, 26 mm in width, and 12 mm in height. The outer edge dimension of the flange 3 was 37 mm in diameter and 1.5 mm in thickness. The flange 3 and the arc-shaped groove 2 were formed integrally when the bakelite bobbin of the sensor element 1 was molded. The magnetic sensor of other directions was also made the same size. The depth of the circular recess 5 was 2 mm.

  The material of the fixing block 4 was also made of bakelite so as not to affect the magnetic measurement, and the mounting screws 6 were non-magnetic stainless steel bolts.

  Next, as shown in FIG. 2A, the sensor element 1 of the present invention is incorporated in the circular recess 5 of the fixing block 4, and the sensor element 1 is rotated to adjust the orthogonality, thereby obtaining the most output characteristics. The sensor element 1 was fixed to the fixing block 4 by screwing the mounting screw 6 at the position.

  Similarly, the three-axis magnetic sensor was completed by adjusting and fixing the orthogonality of the Y and Z-axis sensor elements 1. The number of triaxial magnetic sensors produced was 10.

(Comparative example)
As a comparative example, the configuration shown in FIG. 4 was made as Comparative Example 1, and the configuration having the rotating plate 24 shown in FIG. The quantity was 10 units each. The shape of the sensor element 11 was the same as that of the example except that it did not have a flange.

  Table 1 shows the results of the number of times that reworking was required in the assembly process in the examples and comparative examples according to the present invention.

  As is clear from Table 1, the number of reworking of the example is smaller than that of the comparative example, and the effect of the present invention is recognized. Further, the product weight was reduced by about 10% from the comparative example 1 because the circular recess was formed in the example. In addition, since the comparative example 2 has a rotating plate, the product weight increased.

  The embodiments of the present invention have been described above using the embodiments. However, the present invention is not limited to these embodiments, and the present invention is not limited to the scope of the present invention. Included in the invention. That is, various changes and modifications that can be naturally made by those skilled in the art are also included in the present invention.

1, 21 Magnetic sensor element 2 Arc-shaped groove 3 Gutter 4, 14, 23, 32, 33 Fixing block 5 Circular recess 6, 15, 31 Mounting screw 7, 18, 30 Mounting screw hole 11 X axis direction sensor Element 12 Y-axis azimuth sensor element 13 Z-axis azimuth sensor element 8, 16a Center axis 16b of mounting surface of fixing block Fluctuated position 17 Mounting hole 22 Sensor element mounting hole 24 Rotating plate 25 Cylindrical protrusion 26 Rotating plate Mounting hole 27 Holding claw 28 Holding recess 29 Circular hole 34 Oval recess 35 Projection

Claims (6)

X-axis orthogonal to each other, Y-axis, a 3-axis magnetic sensor fixed combination of three magnetic sensor element corresponding to the three axes direction of Z-axis, a plate-shaped, outer edge of the arc-shaped flange portion, the winding across the on the same side of the portion facing to the outer sides, and the magnetic sensor element formed integrally to project in a direction parallel to the axis of the winding, arcuate inscribing the outer edge of the flange portion the wall portion having an edge with at least a portion, said fixing the magnetic sensor element, the solid-titration, block having a guide portion, over one fixing the fixing block and the magnetic sensor element a mounting member, the said flange portion includes an arc-shaped long hole capable of inserting the mounting only member, the hole portion and the the fixing block for inserting the attachment member to the opposite position and the slot The outer edge of the collar part and the inner edge of the wall part are in contact with each other , 3-axis magnetic sensor, characterized in that the pivotally arranged the center of the arc of the wall portion as an axis, and the magnetic sensor element is fixably constructed using the attachment member at a desired rotational position. And the center of the arc of the wall portion, the three-axis magnetic sensor according to claim 1 the center of the arc of the elongated hole, characterized in that on the central axis of the rotating of the magnetic sensor element.   3. The three-axis magnetic sensor according to claim 1, wherein the attachment member is an attachment screw, and the elongated hole is an arcuate groove. 4.   The three-axis magnetic sensor according to claim 1, wherein the guide portion is a circular recess. 3-axis magnetic sensor according to claim 1 or 3 wherein the guide unit is characterized in that oblong recesses.   The three-axis magnetic sensor according to any one of claims 1 to 3, wherein the guide portion is a protruding portion.

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