JP6536872B2 - Magnetic body for geomagnetic declination correction and geomagnetic declination correction method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a magnetic body for geomagnetic declination correction and a method for correcting the declination of geomagnetism.

  There is known an iron piece provided in an MRI (Magnetic Resonance Imaging) apparatus to homogenize a disturbed magnetic field (see, for example, Patent Document 1). In addition, there is known a technique to make the film thickness formed on the substrate uniform by rotating the magnet during sputtering on the substrate and reversing the magnetic field applied to the substrate by 180 degrees (for example, Patent Document) 2).

Unexamined-Japanese-Patent No. 1-254154 WO 2009/0040892

  By the way, for example, when calibrating an azimuth meter mounted on an aircraft, it is necessary to have an adjustment area in which the declination distribution of the geomagnetism is equalized. In order to obtain such a control area, it is conceivable to correct and equalize the distribution of the declination of the disturbed geomagnetism with the iron piece or magnet described above.

  However, in the case of a magnetic member such as an iron piece, since the magnetic force is weak, the correction range for the geomagnetic declination is small, and it is difficult to obtain a sufficient correction effect. On the other hand, although the correction range can be made larger in the magnet than in the magnetic member, it is more expensive than the magnetic member, which may increase the cost.

  An object of the present invention is, in consideration of the above-mentioned facts, to increase the correction range for the geomagnetic declination while reducing the cost.

The magnetic member for correcting the geomagnetic declination according to the first aspect is a magnetic member for correcting the geomagnetic declination which corrects the declination of the geomagnetism, and is provided on the elongated magnetic member and the elongated magnetic member, and the elongated magnetic member is provided. A magnet is provided to magnetize the magnetic member and form an N pole on one end side in the longitudinal direction of the elongated magnetic member and an S pole on the other end side in the longitudinal direction.

According to the magnetic member for correcting a geomagnetic declination according to the first aspect , the long magnetic member is provided with a magnet. The magnet magnetizes the elongated magnetic member to form an N pole on one end side in the longitudinal direction of the elongated magnetic member and an S pole on the other end side in the longitudinal direction. As a result, the distance between the N pole and the S pole is greater than in the configuration without the elongated magnetic member, so the magnetic field generated around the geomagnetic declination magnetic member becomes larger. Therefore, the correction range for the geomagnetic declination can be increased.

  In addition, the elongated magnetic member can be formed of a steel material or the like that is less expensive than a magnet. Therefore, the cost can be reduced.

  As described above, according to the present invention, it is possible to enlarge the correction range for the geomagnetic declination while reducing the cost.

The magnetic member for correcting the geomagnetic declination according to the second aspect is the magnetic member for geomagnetic declination correction according to the first aspect , wherein the magnet is provided at both ends of the elongated magnetic member in the longitudinal direction, The N pole and the S pole are disposed to face each other with the elongated magnetic member interposed therebetween.

According to the magnetic member for correcting the geomagnetic declination according to the second aspect , the magnets are provided only at the end of one end of the elongated magnetic member in the longitudinal direction by providing the magnets at the ends of both ends of the elongated magnetic member in the longitudinal direction. The magnetic field generated around the geomagnetic declination magnetic body can be made larger than in the case where it is provided.

  In the case of magnetizing a plurality of elongated magnetic members with a magnet, if there is variation or the like in the magnetic force caused by residual magnetization of each elongated magnetic member before providing the magnet, the magnetic material is corrected around the geomagnetic deflection angle correction magnetic body. The generated magnetic field may be small.

  On the other hand, in the present invention, since the magnets are provided at the end portions on both sides in the longitudinal direction of one long magnetic member, a predetermined magnetic field can be generated around the magnetic body for correcting the geomagnetic declination.

In the magnetic member for correcting the geomagnetic declination according to the third aspect, in the magnetic member for correcting the geomagnetic declination according to the first aspect , a plurality of the elongated magnetic members are arranged in the longitudinal direction, and the magnets are adjacent to each other for the length It is provided between the scale magnetic members.

According to the magnetic member for correcting the geomagnetic declination according to the third aspect , by providing the magnet between the adjacent long magnetic members, the magnet is provided only at one end of the one long magnetic member in the longitudinal direction. The magnetic field generated around the geomagnetic declination magnetic body can be made larger than in the case where it is provided.

Declination correction method geomagnetic according to the fourth embodiment, the correction above or below the target horizontal plane, of the magnetic declination in the correction magnetic said corrected horizontal plane according to any one of the first aspect to third aspect The longitudinal direction is set as the north-south direction, the east-west direction, or the vertical direction according to the distribution of the direction of the geomagnetic field.

According to magnetic declination correction method according to the fourth embodiment, above or below the corrected horizontal plane, placing the magnetic declination correction magnetic body according to any one of the first aspect to third aspect. At this time, according to the distribution of the direction of the geomagnetism in the horizontal plane to be corrected, the geomagnetic declination is corrected by making the longitudinal direction of the geomagnetic declination magnetic body the north-south direction, the east-west direction, or the up-down direction. Angular distribution can be made uniform.

  As described above, according to the present invention, it is possible to enlarge the correction range for the geomagnetic declination while reducing the cost.

It is a perspective view which shows the magnetic body for geomagnetic deflection angle correction which concerns on 1st Embodiment of this invention. It is a top view which shows the magnetic body for geomagnetic declination correction | amendment shown by FIG. (A)-(C) are distribution figures which show distribution of direction of the magnetic field generate | occur | produced in the predetermined | prescribed horizontal surface which exists above the magnetic body for geomagnetic declination angle | corners. It is a top view which shows the installation state of the magnetic body for geomagnetic declination correction | amendment shown by FIG. It is a perspective view which shows the magnetic body for geomagnetic deflection angle correction which concerns on 2nd Embodiment of this invention. (A) And (B) is a distribution map which shows distribution of direction of the magnetic field generate | occur | produced in the predetermined horizontal surface which exists above the magnetic body for geomagnetic declination amendment which concerns on the comparative examples 1 and 2. FIG. (A) And (B) is a distribution map which shows distribution of direction of the magnetic field generate | occur | produced in the predetermined | prescribed horizontal surface which exists above the magnetic body for geomagnetic declination amendment which concerns on Example 1, 2. FIG. (A) And (B) is a distribution map which shows distribution of direction of the magnetic field generate | occur | produced in the predetermined | prescribed horizontal surface which exists above the magnetic body for geomagnetic declination amendment which concerns on Example 3, 4. FIG.

  Hereinafter, a magnetic body for geomagnetic declination correction according to an embodiment of the present invention and a method for correcting the geomagnetic declination will be described with reference to the drawings. In addition, S and N suitably shown by each figure have shown the magnetic pole.

  First, the first embodiment will be described.

  As shown in FIG. 1, the geomagnetic declination magnetic body 10 according to the present embodiment includes a pair of elongated magnetic members 12 and 14 and a magnet 20. The pair of elongated magnetic members 12 and 14 is formed of a tubular member (for example, a square steel pipe or the like) having a rectangular cross section having magnetic permeability, and is arranged at intervals in the longitudinal direction. The pair of elongated magnetic members 12 and 14 are formed of a magnetic body other than a magnet (ferromagnetic body). Preferably, the elongated magnetic members 12 and 14 are formed of a material having high magnetic permeability, such as electromagnetic steel (silicon steel).

  The pair of elongated magnetic members 12 and 14 have the same configuration (cross-sectional shape and length). Here, the same configuration of the pair of elongated magnetic members 12 and 14 is a concept including a slight deviation due to a manufacturing error or the like.

  The magnet 20 is formed in a rectangular parallelepiped shape by permanent magnets, such as a neodymium magnet and a ferrite magnet, for example. The magnet 20 has an N pole on one end side in the longitudinal direction and an S pole on the other end side in the longitudinal direction, and is provided between the adjacent elongated magnetic members 12 and 14.

  An end 12A at one end side in the longitudinal direction of one elongated magnetic member 12 is attracted to the end on the N pole side of the magnet 20 by a magnetic force. One long magnetic member 12 is magnetized by the magnet 20. As a result, an S pole is formed at the end 12A at one longitudinal end of one elongated magnetic member 12, and an N pole is formed at the end 12B at the other longitudinal end (opposite to the magnet 20). ing.

  On the other hand, an end 14A at one end side in the longitudinal direction of the other long magnetic member 14 is attracted to the end of the magnet 20 on the S pole side by magnetic force. The other long magnetic member 14 is magnetized by the magnet 20. As a result, an N pole is formed at the end 14A at one longitudinal end of the other long magnetic member 14 and an S pole is formed at the other end 14B at the other longitudinal end (opposite to the magnet 20). ing.

  By providing the magnet 20 between the pair of elongated magnetic members 12 and 14 as described above, an N pole is formed at the end 12 B on one end side in the longitudinal direction of the geomagnetic declination magnetic body 10 as a whole. At the same time, an S pole is formed at the end 14 B on the other end side in the longitudinal direction.

  The magnet 20 and the pair of elongated magnetic members 12 and 14 may be joined by an adhesive or the like. The magnet 20 may be provided so as to magnetize the pair of elongated magnetic members 12 and 14, and a gap may be provided between the magnet 20 and the pair of elongated magnetic members 12 and 14. That is, the magnet 20 and the pair of elongated magnetic members 12 and 14 may not be in contact with each other. Moreover, you may form the magnet 20 with an electromagnet, for example.

  Next, a method of correcting the declination of the geomagnetism will be described.

  As shown by a broken line in FIG. 2, a magnetic field from the N pole to the S pole is formed around the geomagnetic declination magnetic body 10. Note that FIG. 2 schematically shows the magnetic field in the same horizontal plane as the geomagnetic declination magnetic body 10.

  In the present embodiment, a magnetic field generated around the magnetic declination magnetic correction member 10 is used to declination of the geomagnetism in a predetermined horizontal plane (correction target horizontal surface) above or below the magnetic declination correction magnetic material 10 Correct the In addition, geomagnetism here is a generic term of the magnetic field which the earth has. Also, the declination of the geomagnetic field is the angle of deviation of north (magnetic north) on the magnetic field with respect to geographical north (true north), and varies depending on the region and age.

  FIGS. 3A to 3C show the distribution of the direction of the magnetic field generated in a predetermined horizontal plane F above the geomagnetic declination magnetic body 10. In FIGS. 3A to 3C, the orientation of the geomagnetic declination magnetic body 10 is different. According to the orientation of the geomagnetic declination magnetic body 10, the geomagnetic declination magnetic body is modified. The direction of the magnetic field generated in the predetermined horizontal plane above 10 is different. In FIGS. 3A to 3C, the hatched area is an area where the magnetic field is stronger than the area of the outer periphery.

  Specifically, in FIG. 3A, the geomagnetic declination magnetic body 10 is installed with its N pole (the end 12B) facing south on the geographical surface. In this case, on the northwest and southeast sides of the geomagnetic declination magnetic body 10 within the predetermined horizontal plane F, as indicated by the white arrows, an area in which the geomagnetism can be corrected to the east (hereinafter referred to as "eastward correction area" ) 32E is formed. On the other hand, on the northeast and southwest sides of the geomagnetic declination magnetic body 10 within the predetermined horizontal plane F, as indicated by black arrows, a region (hereinafter referred to as "westward correction region") 32W capable of correcting the geomagnetism westward Is formed.

  In contrast to FIG. 3 (A), when the N pole (end 12B) of the geomagnetic declination magnetic body 10 is directed to the geographical north, as shown in FIG. 7 (A) described later. Then, the easting correction area 32E and the westing correction area 32W are interchanged. That is, a westward correction region 32W (black arrow) is formed on the northwest side and the southeast side of the magnetic body 10 for correcting the geomagnetic declination in the predetermined horizontal plane F, and the northeast side and the southwest side of the magnetic body 10 for geomagnetic declination correction A direction correction area 32E (white arrow) is formed.

  Next, in FIG. 3 (B), the geomagnetic declination magnetic body 10 is installed with its N pole (end 12B) facing east on the geographical surface. In this case, a westward correction area 32W is formed around the geomagnetic declination magnetic correction body 10 in the predetermined horizontal plane F, as shown by the black arrow.

  In contrast to FIG. 3B, when the N pole of the geomagnetic declination magnetic body 10 is directed to the west in the geographical direction, the easting correction area 32E and the westing correction area 32W are switched. That is, an easting correction area 32E is formed around the geomagnetic declination magnetic body 10 in the predetermined horizontal plane F.

  Next, in FIG. 3 (C), the geomagnetic declination magnetic body 10 is installed with its N pole (end 12B) facing upward. In this case, an easting correction area 32E is formed on the east side of the geomagnetic declination magnetic body 10 in the predetermined horizontal plane F, as indicated by the white arrow. On the other hand, on the west side of the geomagnetic declination magnetic body 10 in the predetermined horizontal plane F, a westward correction area 32W is formed as indicated by a black arrow.

  In contrast to FIG. 3C, when the N pole of the geomagnetic declination magnetic body 10 is directed downward, the easting correction area 32E and the westing correction area 32W are switched. That is, in the predetermined horizontal plane F, the westward correction area 32W is formed on the east side of the geomagnetic declination magnetic body 10, and the easting correction area 32E is formed on the west side of the geomagnetic declination magnetic body 10.

  In addition, FIGS. 3A to 3C show the magnetic field generated in the predetermined horizontal plane F above the magnetic body 10 for correcting the geomagnetic declination, but the magnetic body 10 for correcting the geomagnetic declination is The same magnetic field as that in FIGS. 3A to 3C is generated in the lower predetermined horizontal plane. However, in the predetermined horizontal plane below the magnetic body 10 for correcting the geomagnetic declination in FIG. 3C, the easting correction area 32E and the westing correction area 32W are switched.

  Here, FIG. 4 shows, as an example, a state in which the geomagnetism 34 in the horizontal plane H to be corrected is inclined to the east with respect to the geographical north at the declination angle θ. In FIG. 4, the size and the direction of the geomagnetism 34 measured at the measurement point P in the horizontal plane H to be corrected are shown by vectors.

  In the case of correcting the declination angle θ of the geomagnetism 34, for example, with the magnetic body 10 for geomagnetic declination angle correction with its N pole (end 12B) directed to the east on the geographical point below the measurement point P Install. As a result, a westward correction area 32W (see FIG. 3B) is formed around the geomagnetic declination magnetic body 10 in the horizontal plane H to be corrected. As a result, the declination angle θ of the geomagnetism 34 is corrected in the west direction as shown by the arrow R and becomes smaller. At this time, the amount of correction of the declination θ is increased or decreased by the distance of the magnetic substance 10 for geomagnetic declination correction from the measurement point P or the magnetic force of the magnet 20 so that the declination θ falls within a predetermined range (permissible range). Do. Thereby, the declination angle θ of the geomagnetism 34 is corrected.

  In addition, the magnetic body 10 for geomagnetic declination angle correction | amendment is installed in the state embed | buried in the concrete (slab) etc. which form the floor under the horizontal plane H for correction | amendment, for example.

  Further, the method of correcting the declination angle θ of the geomagnetism 34 is not limited to the one described above. For example, the N pole (end 12B) of the geomagnetic declination magnetic body 10 may be installed above the measurement point P in a state of being directed to the east on the geographical area. Also in this case, the declination angle θ of the geomagnetism 34 can be reduced as described above.

  Also, for example, the geomagnetic declination magnetic material 10 is installed below and to the east of the measurement point P with its N pole facing upward. In this case, a westward correction area 32W (see FIG. 3C) is formed on the west side of the geomagnetic declination magnetic body 10 in the horizontal plane H to be corrected. Therefore, as described above, the declination angle θ of the geomagnetism 34 can be reduced.

  As described above, the magnetic body 10 for geomagnetic declination correction is installed with the longitudinal direction as the north-south direction, the east-west direction, or the up-down direction according to the distribution of geomagnetic direction (drift distribution of geomagnetism) in the horizontal plane to be corrected . Thereby, the declination of the geomagnetism can be corrected. Further, it is also possible to correct the declination of the geomagnetism by appropriately combining a plurality of geomagnetic declination correcting magnetic bodies 10 having different directions.

  Next, the operation of the first embodiment will be described.

  As shown in FIGS. 1 and 2, according to the geomagnetic declination magnetic body 10 according to the present embodiment, the magnet 20 is provided between the pair of elongated magnetic members 12 and 14. The pair of elongated magnetic members 12 and 14 is magnetized by the magnet 20, and an N pole is formed at the end 12 B of one elongated magnetic member 12, and the end 14 B of the other elongated magnetic member 14. The S pole is formed on the

  As a result, the distance between the N pole (end 12B) and the S pole (end 14B) is greater than in the configuration without the pair of elongated magnetic members 12 and 14, and therefore the magnetic member for correcting the geomagnetic declination The magnetic field generated around 10 can be increased. Therefore, the correction range for the geomagnetic declination can be increased. In addition, the pair of elongated magnetic members 12 and 14 can be formed of a steel material or the like that is less expensive than the magnet 20. Accordingly, the manufacturing cost of the geomagnetic declination magnetic body 10 can be reduced.

  As described above, in the present embodiment, it is possible to enlarge the correction range for the geomagnetic declination while reducing the cost of the geomagnetic declination magnetic body 10. In particular, the magnetic body 10 for geomagnetic declination correction according to the present embodiment is effective for correction of geomagnetism in a large correction target horizontal plane, for example, as an adjustment area for calibrating an azimuth meter mounted on an aircraft. .

  Further, in the present embodiment, by providing the magnet 20 between the pair of elongated magnetic members 12 and 14 having the same configuration, the pair of elongated magnetic members 12 and 14 can be equally magnetized. Therefore, the magnetic field generated around the geomagnetic declination magnetic member 10 can be efficiently increased.

  When the geomagnetic declination magnetic body 10 is installed with its N pole (end 12B) facing upward, the concrete slab (concrete slab) that forms the floor below the horizontal plane H to be corrected, for example The S pole side (the end 14 B of the elongated magnetic member 14) of the geomagnetic declination magnetic body 10 is driven in. Under the present circumstances, when the elongate magnetic member 14 is formed by the cylindrical member, it becomes easy to drive the edge part 14B of the elongate magnetic member 14 in concrete. Therefore, the effort of the installation operation | work of the magnetic body 10 for geomagnetic declination angle correction can be reduced.

  Next, a second embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects a same sign, and abbreviate | omits description.

  As shown in FIG. 5, the geomagnetic declination magnetic body 40 according to the second embodiment has a long magnetic member 42 and a pair of magnets 50 and 52. The elongated magnetic member 42 is formed of a tubular member having a rectangular cross section (for example, a square steel pipe or the like). Magnets 50 and 52 are respectively provided at the end portions 42A and 42B on both sides in the longitudinal direction of the elongated magnetic member 42.

  The pair of magnets 50 and 52 are disposed such that the S pole and the N pole face each other with the elongated magnetic member 42 interposed therebetween. The elongated magnetic member 42 is magnetized by the pair of magnets 50 and 52, and an N pole is formed at the end 42A at one end side of the elongated magnetic member 42 in the longitudinal direction, and the other end in the longitudinal direction of the elongated magnetic member 42 An S pole is formed at the side end 42B. The pair of magnets 50 and 52 may be disposed in a state in which the S pole and the N pole face each other, and the pair of magnets 50 and 52 may be interchanged.

  Next, the operation of the second embodiment will be described.

  As shown in FIG. 5, according to the magnetic member 40 for correcting the geomagnetic declination according to the present embodiment, the magnets 50, 52 are respectively provided at the end portions 42A, 42B on both sides in the longitudinal direction of the elongated magnetic member 42. There is. As a result, the distance between the N pole and the S pole is greater than in the configuration without the elongated magnetic member 42, so the magnetic field generated around the geomagnetic declination magnetic member 40 can be increased.

  Therefore, it is possible to enlarge the correction range for the geomagnetic declination while reducing the cost of the geomagnetic declination magnetic body 40.

  Further, by providing the magnets 50 and 52 at the end portions 42A and 42B on both longitudinal sides of one long magnetic member 42, for example, only at the end 42A on one end side in the longitudinal direction of the long magnetic member 42 Compared to the case where the magnet 50 is provided, the magnetic field generated around the geomagnetic declination magnetic body 40 can be increased. This point will be described later in the analysis results.

  Furthermore, for example, in the case where the plurality of elongated magnetic members 12 and 14 are magnetized by the magnet 20 as in the first embodiment, the following may be concerned, that is, each elongated before the magnet 20 is provided. The magnetic members 12 and 14 may have residual magnetization which is magnetized due to the use of a magnet lift or the like in the manufacturing process of the members. Then, if there is variation or the like in the magnetic force caused by residual magnetization etc. among the plurality of elongated magnetic members 12 and 14, the magnetic field generated around the magnetic body 10 for correcting the geomagnetic declination may become small. . Therefore, there is a possibility that the manufacturing control of the pair of elongated magnetic members 12, 14 may be complicated.

  On the other hand, in the present embodiment, since one long magnetic member 42 is magnetized by the magnets 50 and 52, the variation of the magnetic force of the pair of long magnetic members 12 and 14 is taken into consideration as in the first embodiment. There is no need to Therefore, manufacturing control of the elongated magnetic member 42 is facilitated.

  Next, modifications of the first and second embodiments will be described. In the following, various modifications will be described by taking the first embodiment as an example, but these modifications can be appropriately applied to the second embodiment.

  Although the example which provided the one magnet 20 between a pair of elongate magnetic members 12 and 14 was shown in the said 1st Embodiment, it does not restrict to this. For example, a plurality of magnets may be provided between the pair of elongated magnetic members 12 and 14. Also, for example, a plurality of magnets and a plurality of elongated magnetic members may be alternately arranged. Furthermore, for example, a magnet may be inserted into the inside of one long magnetic member formed in a cylindrical shape, and the long magnetic member may be magnetized.

  Moreover, although the example which formed the elongate magnetic members 12 and 14 by the cylindrical member of the cross-sectional rectangular shape was shown in the said 1st Embodiment, it does not restrict to this. The elongated magnetic members 12 and 14 may be formed of, for example, tubular members having a polygonal cross section or a circular cross section. The elongated magnetic members 12 and 14 are not limited to cylindrical members, and may be formed of solid members. Similarly to this, the shape of the magnet 20 can be appropriately changed.

  Next, the analysis results of the magnetic field generated around the geomagnetic declination magnetic member will be described.

  In this analysis, the magnetic field generated on a predetermined horizontal plane F above the magnetic substance for geomagnetic declination correction according to Comparative Examples 1 and 2 and Examples 1 to 4 was determined. The cross-sectional dimensions of the elongated magnetic members 12, 14, 102, 102 and the magnets 20, 50, 52 used in this analysis are all 50 mm × 50 mm. Moreover, the plate | board thickness of elongate magnetic member 12, 14, 42, 102 is 2.3 mm.

<Configuration of Comparative Example>
As shown in FIG. 6A, the magnetic body 100 for correcting the geomagnetic declination according to Comparative Example 1 is constituted only by the elongated magnetic member 102 formed of a square steel pipe. The total length of the elongated magnetic member 102 is the same as the total length (100 mm) of the geomagnetic declination magnetic members 60, 62, 64, 66 according to Examples 1 to 4 described later. On the other hand, as shown in FIG. 6 (B), the magnetic body 110 for correcting the geomagnetic declination according to the comparative example 2 is configured only by the magnet 20 (length 100 mm × one) formed in a rectangular parallelepiped shape. .

<Configuration of Example>
As shown in FIG. 7A, the magnetic member 60 for correcting the geomagnetic declination according to the first embodiment has a magnet 20 (long) between a pair of long magnetic members 12 and 14 (length 450 mm × 2). 100 mm × one) is provided. The geomagnetic declination magnetic body 60 according to the first embodiment corresponds to the geomagnetic declination magnetic body 10 according to the first embodiment. On the other hand, as shown in FIG. 7B, the magnetic member 62 for correcting the geomagnetic declination according to the second embodiment has a gap (1 mm) between the pair of elongated magnetic members 12 and 14 and the magnet 20. The

  As shown in FIG. 8A, the magnetic member 64 for correcting the geomagnetic declination according to the third embodiment has magnets 50 and 52 (50 mm in length at the end portions 42A and 42B on both sides in the longitudinal direction of the elongated magnetic member 42). 2) are provided respectively. The geomagnetic declination magnetic body 64 according to the third embodiment corresponds to the geomagnetic declination magnetic body 40 according to the second embodiment. On the other hand, as shown in FIG. 8 (B), the magnetic member 66 for correcting the geomagnetic declination according to the fourth embodiment is the end of one longitudinal end of the elongated magnetic member 42 (length 900 mm × one). The magnet 20 (100 mm in length × one) is provided in the portion 42A.

<Analysis result>
As shown in FIG. 6A, in the magnetic body 100 for correcting the geomagnetic declination according to Comparative Example 1, the magnetic field generated in the predetermined horizontal plane F is small, and the correctable range of the geomagnetism (declination) is small. I understand. On the other hand, as shown in FIG. 6 (B), it can be seen that in the geomagnetic declination magnetic body 110 according to the comparative example 2, the geomagnetic correctable range becomes large due to the influence of the magnetic force of the magnet 20.

  On the other hand, as shown in FIG. 7A, FIG. 7B, FIG. 8A, and FIG. , 62, 64, 66, it can be seen that the geomagnetic correctable range becomes larger than that of the geomagnetic declination magnetic body 110 according to the second comparative example.

  Further, in the geomagnetic declination magnetic members 60, 62, 64 according to the first to third embodiments, the geomagnetic correctionable range is substantially the same. On the other hand, it can be seen that the geomagnetic deflection correction magnetic body 66 according to the fourth embodiment has a slightly smaller geomagnetic correction range than the geomagnetic deflection correction magnetic bodies 60, 62, 64 according to the first to third embodiments. . This is because the magnet 20 is provided only at the end 42A at one longitudinal end of the elongated magnetic member 42, so that the degree of magnetization is weak toward the end 42B at the other longitudinal end of the elongated magnetic member 42. It is thought that it is because it became.

  On the other hand, in the fourth embodiment, the magnet 20 is provided only at the end 42A at one end side of the long magnetic member 42 in the longitudinal direction of the magnetic member 42 for geomagnetic declination correction, so the manufacture of the magnetic body 66 for geomagnetic deflection correction is easy. It becomes.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to such Embodiment, You may use it combining suitably one Embodiment and various modifications, The summary of this invention Of course, various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 10 Magnetic body 12 magnetic correction | amendment magnetic correction 12 elongate magnetic member 14 elongate magnetic member 20 magnet 34 geomagnetic 40 magnetic body 40 magnetic correction correction | amendment magnetic field 42 edge part of elongate magnetic member 42A (end part of the longitudinal direction of elongate magnetic member)
42B end (longitudinal end of elongated magnetic member)
50 magnet 52 magnet 60 magnetic body for geomagnetic declination correction 62 magnetic body for geomagnetic declination correction 64 magnetic body for geomagnetic declination correction 66 magnetic body for geomagnetic declination correction θ magnetic body for correction

Claims (3)

A magnetic body for geomagnetic declination correction for correcting the geomagnetic declination of a horizontal plane to be corrected,
Long magnetic member,
A magnet provided on the elongated magnetic member to magnetize the elongated magnetic member to form an N pole on one end side in the longitudinal direction of the elongated magnetic member and an S pole on the other end side in the longitudinal direction;
Equipped with
The magnet is provided on end faces of end portions on both sides in the longitudinal direction of the elongated magnetic member, and is disposed so that an N pole and an S pole face each other across the elongated magnetic member,
A magnetic body for geomagnetic declination correction, which is installed above or below the horizontal surface to be corrected, with the longitudinal direction as the north-south direction, the east-west direction, or the vertical direction according to the distribution of geomagnetic direction in the horizontal surface to be corrected. A magnetic body for geomagnetic declination correction for correcting the geomagnetic declination of a horizontal plane to be corrected,
Long magnetic member,
A magnet provided on the elongated magnetic member to magnetize the elongated magnetic member to form an N pole on one end side in the longitudinal direction of the elongated magnetic member and an S pole on the other end side in the longitudinal direction;
Equipped with
The plurality of elongated magnetic members are arranged in the longitudinal direction,
The magnet is provided between the adjacent long magnetic members,
A magnetic body for geomagnetic declination correction, which is installed above or below the horizontal surface to be corrected, with the longitudinal direction as the north-south direction, the east-west direction, or the vertical direction according to the distribution of geomagnetic direction in the horizontal surface to be corrected. An elongated magnetic member, provided on the elongated magnetic member to magnetize the elongated magnetic member, forming an N pole on one end side in the longitudinal direction of the elongated magnetic member and an S pole on the other end side in the longitudinal direction The magnetic material for geomagnetic declination correction having a magnet to be formed is positioned above or below the horizontal surface to be corrected, depending on the distribution of the direction of the geomagnetism in the horizontal surface to be corrected; Geomagnetic declination correction method installed as a direction.