String-shaped magnet, magnetization method thereof, magnetic treatment device, and magnetizer

Abstract

To provide a string-shaped magnet in which the position of a neutral line between an N pole and an S pole is not constant in a longitudinal direction.SOLUTION: There is provided a string-shaped magnet 1 in which a plurality of magnetization parts 3 and 4 are arranged in a longitudinal direction of a cable body 2. As for polarities of the magnetization parts 3 and 4, N poles and S poles are alternately arranged in a longitudinal direction, and the N poles and S poles are arranged sandwiching a polar boundary surface that divides the radial direction of the cable body at least into two. The position of a neutral line NL formed at both edges in the radial direction of the polar boundary surfaces 5 and 6 changes in the longitudinal direction in a natural state of the cable body 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a string-like magnet, a magnetization method thereof, a magnetic treatment device, and a magnetizer. [Background technology]

[0002] Conventionally, permanent magnets have been used as magnetic therapy devices (magnetic necklaces, etc.), and for example, a string-like magnet 1 shown in Figs. 11 and 12 is used as a material for magnetic necklaces, etc. (see Patent Document 1). This string-like magnet 1 has a flexible cord 2 containing magnetic powder, and magnetized parts 3, 4 and non-magnetized parts 7 are formed alternately in the longitudinal direction of the cord 2. This string-like magnet 1 can generate magnetic field lines J1, J2 over a wide range, and when worn around the neck, for example, the magnetism can promote blood circulation and relax muscles, treating stiff shoulders. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5544082 [Patent Document 2] Special Publication No. 7-101650 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional string magnet 1 cord body Polar boundary surfaces 5, 6 which bisect the radial direction of string-shaped magnet 2 are continuous and flush in the longitudinal direction of string-shaped magnet 1. Therefore, when string-shaped magnet 1 is bent into a ring shape as shown in Figure 13 for mounting on a neck portion, for example, the position of the neutral line NL formed by both radial end edges of polar boundary surfaces 5, 6 will be at a constant position in the circumferential direction as shown in Figure 13(a), (b) or (c).

[0005] The neutral line NL appears on the magnetic viewing sheet as a circular white line as shown in Figure 13(a). As can be seen from this, the magnetic field is very weak near the neutral line NL, so when a string-shaped magnet 1 shaped like a ring as in Figure 13(a) is worn around the neck as in Figure 14, the neutral line NL comes into contact with the area from the collarbone down to the chest. Also, with the string-shaped magnet 1 in Figure 13(b), the neutral line NL comes into contact with the back of the neck, while with the string-shaped magnet 1 in Figure 13(c), the neutral line NL comes into contact with the side of the neck. (x: forward, y: right, z: upward)

[0006] In this way, in the conventional string-shaped magnet 1, the position of the neutral line NL varies depending on how the ring is bent, as shown in Figures 13(a), (b), and (c), but the neutral line NL always comes into contact with a specific point around the neck. Since the magnetism cannot penetrate deeply into the body at such specific points, there is a risk that the effect of magnetic therapy will decrease. The present invention was made in consideration of these circumstances, and aims to provide a string-shaped magnet in which the position of the neutral line is not constant in the longitudinal direction. [Means for solving the problem]

[0007] The string-shaped magnet of the present invention for achieving the above object is a string-shaped magnet having a plurality of magnetized parts arranged in the longitudinal direction of a cable body, and the polarity of the magnetized parts is arranged such that N poles and S poles are alternately arranged in the longitudinal direction, and cord body The N pole and the S pole are arranged on either side of a polar boundary surface that divides the radial direction of the wire in at least two halves, and the position of the neutral line formed by both radial ends of the polar boundary surface is In natural conditions It is characterized by being changed in the longitudinal direction. Effect of the Invention

[0008] Since the position of the neutral line of the string-like magnet of the present invention changes in the longitudinal direction of the string, it is possible to prevent a decrease in the magnetic therapeutic effect at a specific location when used as a magnetic therapeutic device. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic cross-sectional view of a string-shaped magnet according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic perspective view of a string-shaped magnet according to an embodiment of the present invention. [Diagram 3] FIG. 11 is a schematic perspective view of a string magnet according to another embodiment of the present invention. [Figure 4] FIG. 1 is a plan view of a magnetic necklace using a string-shaped magnet according to an embodiment of the present invention. [Diagram 5] FIG. 13 is a schematic cross-sectional view of a string-shaped magnet according to a modified embodiment in which the non-magnetized portions are omitted. [Figure 6] FIG. 13 is a cross-sectional view showing a modification of the polar interface. [Figure 7] FIG. 1 is a schematic diagram of a manufacturing line for string magnets. [Figure 8] FIG. 13 is a diagram showing a change in diameter of a cable body in a twisted and magnetized state. [Figure 9A] 1A and 1B are diagrams showing the state of magnetic field lines crossing a non-magnetized portion, in which (a) is a diagram showing a twisted state and (b) is a diagram showing an untwisted state. [Figure 9B] 1A and 1B are cross-sectional views of a cable showing the direction of magnetic field lines, in which (a) is a view of the cable in a twisted state and (b) is a view of the cable in an untwisted state. [Figure 10A] FIG. 2 is a perspective view of a magnetizer that does not use twisting magnetization. [Figure 10B] FIG. 4 is a cross-sectional view of a magnetizer showing an arrangement state of magnetizing yokes. [Figure 11] FIG. 1 is a schematic perspective view of a conventional string-shaped magnet. [Figure 12] FIG. 1 is a schematic cross-sectional view of a conventional string-shaped magnet. [Figure 13] FIG. 1 is a plan view of a magnetic necklace using a conventional string-shaped magnet. [Figure 14] FIG. 1 is a perspective view showing a state in which a magnetic necklace using a conventional string-shaped magnet is in use. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] ●String magnet The string magnet according to an embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a schematic cross-sectional view of the string magnet 1, and (a) to (e) are cross-sectional views of magnetized portions 3 and 4. Fig. 2 is a schematic perspective view of the string magnet 1.

[0011] The string-like magnet 1 has a flexible cord 2. The cord 2 can be made of any material, for example, synthetic resin. Specifically, the cord 2 can be formed by mixing flexible olefin-based rubber, ethylene-based resin which is a thermoplastic synthetic resin, and ferrite powder which is a magnetic powder in a mixer and extruding the mixture.

[0012] Examples of the olefin-based rubber include ethylene-propylene copolymer rubber, ethylene-butylene copolymer rubber, etc. Examples of the ethylene-based resin include low-density polyethylene resin, high-density polyethylene resin, linear low-density polyethylene resin, ethylene-vinyl acetate copolymer resin, etc., which have good miscibility with the olefin-based rubber.

[0013] The cable 2 is a flexible string-like body containing magnetic powder and is formed in a circular cross section. A plurality of first magnetized portions 3 and second magnetized portions 4 are alternately arranged at predetermined intervals in the longitudinal direction of the cable 2 with non-magnetized portions 7 sandwiched therebetween.

[0014] The first magnetized portion 3 and the second magnetized portion 4 can be formed by magnetizing the magnetic powder of the cable body 2 with a magnetizer. In addition, the non-magnetized portion 7 can be formed by turning off the current to the exciting coil of the magnetizer.

[0015] The first magnetized portion 3 and the second magnetized portion 4 can be made to have approximately the same length in the longitudinal direction. On the other hand, the length of the non-magnetized portion 7 can be made significantly shorter than the lengths of the first magnetized portion 3 and the second magnetized portion 4, and the non-magnetized portion 7 can be formed to have a length of, for example, 1.0 to 1.5 mm. Since the non-magnetized portion 7 is intended to generate magnetic lines of force over a wide range as described in Patent Document 1, it is not necessary to extend it more than necessary in the longitudinal direction.

[0016] The first magnetized portion 3 is magnetized by a magnetizer so that a magnetic polarity boundary surface 5 is formed in a planar shape along the longitudinal direction (axial direction) of the cable 2. This polarity boundary surface 5 is formed so as to bisect the first magnetized portion 3 in the radial direction. The semi-cylindrical portion on one side of the polarity boundary surface 5 is magnetized so as to be an N pole, and the semi-cylindrical portion on the opposite side is magnetized so as to be an S pole.

[0017] The second magnetized portion 4 is also magnetized by a magnetizer so that a magnetic polarity boundary surface 6 is formed in a planar shape along the longitudinal direction (axial direction) of the cable 2. This polarity boundary surface 6 is formed so as to bisect the second magnetized portion 4 in the radial direction. The semi-cylindrical portion on one side of the polarity boundary surface 6 is magnetized so as to be a north pole, and the semi-cylindrical portion on the opposite side is magnetized so as to be a south pole.

[0018] ●Alternating north and south poles The polarities of the first magnetized portion 3 and the second magnetized portion 4 are magnetized so that they are opposite in the longitudinal direction sandwiching the non-magnetized portion 7 and also opposite in the radial direction sandwiching the polar boundary surfaces 5 and 6 (alternate N-pole and S-pole arrangement). In addition, the polar boundary surface 5 of the first magnetized portion 3 and the polar boundary surface 6 of the second magnetized portion 4 are cord body 1 and 2, the position of the neutral line NL formed by both radial ends of the polar boundary surfaces 5 and 6 is different. cord body The polar interfaces 5, 6 are arranged to vary in the longitudinal direction of the electrode 2.

[0019] ●Neutral line position In the examples of Figures 1 and 2, the position of the neutral line NL is the same as that of the string magnet 1( cord body 2) in the longitudinal direction, the inclination angle is changed stepwise in a spiral shape. The rate of this stepwise change is arbitrary. That is, the rate of change in the inclination angle from the polarity boundary surface 5 of the first magnetized portion 3 to the polarity boundary surface 6 of the second magnetized portion 4 may be about 15 degrees as shown in FIG. 1 or about 30 degrees as shown in FIG. 2.

[0020] The position of the neutral line NL is not limited to the examples in Figures 1 and 2. As shown in Figure 3, cord body2) It may be changed continuously in a spiral shape in the longitudinal direction. When the position of the neutral line NL changes continuously in a spiral shape as shown in Fig. 3, the N pole and S pole are evenly switched in a tornado shape on either side of the neutral line NL in the longitudinal direction of the cable 2, so that a further improvement in the magnetic therapy effect can be expected.

[0021] Figure 4 shows a portion of a looped string-like magnet 1 (magnetic necklace) observed on a magnetic viewing sheet. It can be seen that the position of the neutral line NL, which appears as a white line, changes continuously in a spiral shape in the longitudinal direction of the string-like magnet 1. The black lines adjacent to the white line of this neutral line NL are the north and south poles that extend in a tornado shape.

[0022] 11, the magnetic field lines generated from the N pole of each first magnetized portion 3 reach not only the S pole of that first magnetized portion 3 but also the S pole of the adjacent second magnetized portion 4 in the longitudinal direction. Also, the magnetic field lines generated from the N pole of the adjacent second magnetized portion 4 reach not only the S pole of that second magnetized portion 4 but also the S pole of the first magnetized portion 3 adjacent in the longitudinal direction.

[0023] The magnetic field lines generated in the longitudinal direction are maximum between the longitudinal centers of the adjacent magnetized portions 3 and 4 (around the non-magnetized portion 7). These maximum magnetic field lines can enhance the effect of magnetic therapy.

[0024] However, since the magnetism is very weak near the neutral line NL, if the position of the neutral line NL is constant as in Figures 11 and 12, the neutral line NL will always come into contact with a specific location around the neck, which may reduce the magnetic therapeutic effect at that specific location. In contrast, in this embodiment, the position of the neutral line NL is changed as shown in Figures 1 to 3, which makes it possible to prevent the magnetic therapeutic effect from decreasing at that specific location around the neck.

[0025] Modified embodiment of string-shaped magnet Next, a modified embodiment of the string-shaped magnet 1 in which the non-magnetized portion 7 in Fig. 1 is omitted will be described with reference to the schematic cross-sectional view in Fig. 5. The non-magnetized portion 7 in Fig. 1 is effective for generating magnetic lines of force over a wide area, but if it is not necessary to generate magnetic lines of force over such a wide area, it is also possible to omit the non-magnetized portion 7 as shown in Fig. 5. In this case, the first magnetized portion 3 and the second magnetized portion 4 will be directly adjacent to each other in the longitudinal direction of the string-shaped magnet 1.

[0026] Deformation of polar boundary surface Also, the polar boundary surface is cord body In addition to the configuration in which the radial direction of 2 is divided into two as shown in Figures 1 to 3 (bipolar magnetization by polarity boundary surfaces 5 and 6), it is also possible to have a multipolar magnetization of N and S poles as shown in Figures 6(a) to (f). That is, the polarity boundary surface 8 in Figure 6(a) is cross-shaped (four walls), and the N and S poles are divided and magnetized into four poles by this cross-shaped polarity boundary surface 8.

[0027] The polarity boundary surface 9 in Fig. 6(b) has six walls and is magnetized with six separate N and S poles. The polarity boundary surface 10 in Fig. 6(c) has eight walls and is magnetized with eight separate N and S poles. By magnetizing with multiple poles in this way, it is expected that the magnetic therapy effect will be further improved.

[0028] The cross section of the cord 2 may be any shape, such as a circle, a polygon, or an ellipse. cord body The polar boundary surface 11 in Fig. 6(d) has four walls, and the N pole and S pole are divided into four poles for magnetization. Fig. 6(e) shows a magnet with a regular hexagonal cross section. cord body This is an example of a string-shaped magnet 1 using 2. The polar boundary surface 12 in Figure 6(e) has six walls, and the N pole and S pole are divided into six poles for magnetization.

[0029] Figure 6(f) shows a square with a regular octagonal cross section. cord body The polar boundary surface 13 in Fig. 6(f) has eight walls, and the N pole and S pole are divided into eight poles for magnetization. Also, Fig. 6(g) shows a magnet with an elliptical cross section. cord body 6(g) is an example of a string-shaped magnet 1 using 2. The polar boundary surface 14 in Fig. 6(g) is X-shaped (four walls), and the N pole and S pole are divided and magnetized into four poles by this polar boundary surface 14.

[0030] ●String magnet manufacturing line Next, the manufacturing line for the string-shaped magnet 1 and the twisting and magnetizing method will be explained with reference to Figures 7(a) and (b). The manufacturing line for the string-shaped magnet 1 in Figure 7(a) has an extrusion molding machine 20, a cooling device 30, take-up machines 40 and 60, a magnetizer 50, and a winding machine 70.

[0031] The magnetizer 50 may be any of various known magnetizers, for example, the magnetizer disclosed in Patent Document 2. The magnetizer in Patent Document 2 has a plurality of magnetic pole pieces arranged at equal intervals in the longitudinal direction of the production line. cord body In order to generate a magnetic field that will give 2 the required coercive force, a current is instantly discharged from the magnetizing power supply.

[0032] The material of the cable body 2 (magnetic powder or molten resin containing magnetic material) is mixed in a mixer and then extruded continuously or intermittently in a string-like shape from an extrusion molding machine 20. It is then cooled in a cooling device 30 and introduced continuously or intermittently into a magnetizer 50 through a take-up machine 40. After the magnetic powder of the cable body 2 is magnetized by the magnetizer 50, the cable body 2 (string-like magnet 1) is passed through a take-up machine 60 and wound up by a winder 70.

[0033] ●Twist magnetization method As shown in FIG. 7(b), a twisting device 80 is disposed on the inlet and outlet sides of the magnetizer 50. The twisting device 80 applies a twist to the cable body 2 continuously or intermittently. In other words, the twisting device 80 can perform a twisting magnetization method in which the cable body 2 is magnetized in a twisted state. Depending on the degree of twisting of the cable body 2, the string-like magnet 1( cord body 2) The rate at which the position of the neutral line NL changes spirally, either continuously or stepwise, in the longitudinal direction is determined.

[0034] The twisted state of the cord body 2 is naturally released after the cord body 2 passes through the downstream twisting device 80 (the cord body 2 elastically returns to its original state). This results in a string-like magnet 1 in which the position of the neutral line NL changes spirally, continuously or stepwise, as shown in Figs. 1 to 3.

[0035] ●The effect of twisting and magnetizing When the cord body 2 is twisted by the twisting device 80, the diameter of the cord body 2 decreases from D1 to D2 as shown in Fig. 8. This is because the twisting causes tension to act in the longitudinal direction of the cord body 2. By decreasing the diameter of the cord body 2 to D2 in this manner, the first magnetized portion 3 and the second magnetized portion 4 can be formed with higher density than when the cord body 2 is not twisted (diameter D1).

[0036] Furthermore, when the cable 2 passes through the twisting device 80 and the twist and longitudinal tension of the cable 2 are released, the cable 2 elastically returns (self-contracts), and the width of the non-magnetized portion 7 decreases from W1 to W2 as shown in Fig. 9A(a) to (b), and the neutral line NL inclines in a spiral shape. Then, strong magnetic field lines J1 due to the alternating arrangement of N and S poles can be formed along the inclination direction of the neutral line NL. Here, W1 in the twisted state can be, for example, 2.0 to 2.2 mm, and W2 in the untwisted state can be, for example, 0.5 to 1.5 mm.

[0037] Also, Figure 9B shows the direction of the magnetic field lines. cord body 2, where (a) is a view of the twisted state and (b) is a view of the untwisted state. In the twisted state of (a), the direction of the magnetic field lines is perpendicular to the polar boundary surfaces 5 and 6. This is due to the arrangement of the magnetizing yokes of the magnetizer 50, i.e., the radially opposing arrangement of the through holes 50a.

[0038] In contrast, in the untwisted state of (b), the direction of the magnetic field lines is cord body The shape radiates from the center of 2. This is the state of (a) twisted to (b) untwisted. cord body This is because the diameter of 2 expands evenly in the radial direction. By generating magnetic field lines over a wide area in the circumferential direction as in (b), the magnetic therapy effect can be enhanced more than in the state of (a).

[0039] Magnetization methods other than twisting magnetization The helical neutral line NL can be formed by slightly shifting and arranging multiple magnetic pole pieces (magnetizing yokes) of the magnetizer 50, in addition to the method of twisting and magnetizing the cable 2. Figures 10A and 10B show the configuration of such a magnetizer 50, which is configured in an elongated rectangular shape.

[0040] A through hole 50a for continuously or intermittently passing the cable 2 is formed along the longitudinal direction of the magnetizer 50. A plurality of magnetizing yokes 50b, 50c are disposed along the inner peripheral surface of the through hole 50a as shown in FIG.

[0041] The magnetizing yoke 50b is for magnetizing the N pole, and the magnetizing yoke 50c is for magnetizing the S pole. The N pole magnetizing yoke 50b and the S pole magnetizing yoke 50c are arranged facing each other in the radial direction of the through hole 50a with the through hole 50a in between, and the N pole magnetizing yoke 50b and the S pole magnetizing yoke 50c are arranged alternately along the through hole 50a. A radial partition 50d is provided between the N pole magnetizing yoke 50b and the S pole magnetizing yoke 50c that face each other with the through hole 50a in between.

[0042] 10B, five magnetizing yokes 50b, 50c are arranged at equal intervals in the longitudinal direction of the through hole 50a, but the number of magnetizing yokes 50b, 50c is arbitrary. Six or more magnetizing yokes 50b, 50c may be arranged, or four or less magnetizing yokes may be arranged. A gap is formed between adjacent magnetizing yokes 50b, 50c in the longitudinal direction of the through hole 50a to form a non-magnetized portion 7.

[0043] The positions (phases) of the magnetizing yokes 50b, 50c change along the longitudinal direction of the magnetizer 50. That is, from (a) to (e) in FIG. 10B, the angle of the partition portion 50d between the magnetizing yokes 50b and 50c is gradually shifted in the clockwise direction.

[0044] In the illustrated example, the partitions 50d are formed to be shifted by about 15° in the clockwise direction. Of course, the angle at which the partitions 50d change is arbitrary and is not limited to 15°.

[0045] In this way, by arranging the multiple magnetizing yokes 50b, 50c with slight offsets, it is possible to form a spiral neutral line NL without twisting and magnetizing the cable body 2. Therefore, when the magnetizer 50 in Fig. 10B is used, the twisting device 80 in Fig. 7 can be omitted.

[0046] Although the present invention has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made within the scope of the technical ideas described in the claims. For example, in the above embodiment, the position of the neutral line NL is changed stepwise or continuously in a spiral shape in the longitudinal direction of the cable body 2. However, since the position of the neutral line NL may be changed in the longitudinal direction of the cable body 2, the position of the neutral line NL may be changed in a zigzag shape in the longitudinal direction of the cable body 2. In addition, the first magnetized portion 3 and the second magnetized portion 4 do not necessarily need to be arranged at a predetermined interval in the longitudinal direction of the cable body 2 with the non-magnetized portion 7 sandwiched therebetween. The first magnetized portion 3 and the second magnetized portion 4 may be formed at equal intervals or may be arranged at unequal intervals (random intervals).

[0047] The first magnetized portion 3 and the second magnetized portion 4 may be formed by magnetizing the magnetic powder of the cable body 2 with a magnetizer. cord body Alternatively, the magnet may be formed by magnetizing magnetic bodies arranged at equal or unequal intervals in the longitudinal direction of the magnet 2 using a magnetizer. The magnetic bodies are preferably hard magnetic bodies, and magnetic stainless steel, silicon iron, neodymium magnets, rare earth magnets such as samarium cobalt magnets (samarium cobalt magnets), ferrite magnets, alnico magnets, etc. may be used.

[0048] Furthermore, the string-like magnet 1 of the present invention can be applied to magnetic therapy devices (magnetic necklaces) worn around the neck, as well as magnetic therapy devices worn around the wrist, arm, elbow, knee, waist, ankle, etc., and magnetic mattresses used as training mats, fitness mats, yoga mats, etc. The string-like magnet 1 of the present invention can also be applied to various uses other than the magnetic therapy devices. [Explanation of symbols]

[0049] 1: String magnet 2: Cord 3: First magnetized section 4: Second magnetized section 5, 6: Polar boundary surface 7: Non-magnetized part 20: Extrusion molding machine 30: Cooling device 40, 60: Take-off machine 50: Magnetizer 50a: Through hole 50b: N-pole magnetizing yoke 50c: S-pole magnetizing yoke 50d: Partition 70: Winding machine 80: Twisting device J1, J2: Magnetic field lines NL: Neutral line

Claims

1. A string-shaped magnet having a plurality of magnetized portions arranged in the longitudinal direction of a cord body, The polarities of the magnetized portion are arranged such that N poles and S poles are alternately arranged in the longitudinal direction, and the N poles and S poles are arranged on either side of a polar boundary surface that divides the cord-like body in at least two radial directions, A string-shaped magnet, characterized in that the position of a neutral line formed by both radial edges of the polar boundary surface changes in the longitudinal direction of the string body.

2. A string-shaped magnet in which magnetized parts and non-magnetized parts are alternately arranged in the longitudinal direction of a cord body, the polarity of the magnetized portion is opposite in the longitudinal direction sandwiching the non-magnetized portion and also opposite in the radial direction sandwiching a polarity boundary surface that divides the radial direction of the cord-like body in at least two halves, A string-shaped magnet, characterized in that the position of a neutral line formed by both radial edges of the polar boundary surface changes in the longitudinal direction of the string body.

3. 3. The string-shaped magnet according to claim 1, wherein the position of the neutral line changes stepwise in a spiral manner in the longitudinal direction of the string.

4. 3. The string-shaped magnet according to claim 1, wherein the position of the neutral line changes continuously in a spiral shape in the longitudinal direction of the string.

5. 3. The string-shaped magnet according to claim 2, wherein the length of the non-magnetized portion in the longitudinal direction is shorter than the length of the magnetized portion.

6. The string-shaped magnet according to claim 1 or 2, characterized in that the cord-like body is made of a flexible material containing magnetic powder or a magnetic body, and the magnetized portion is formed by magnetizing the magnetic powder or the magnetic body with a magnetizer.

7. A magnetic therapeutic device such as a magnetic necklace or a magnetic mattress using the string-like magnet according to claim 1 or 2.

8. A magnetization method for manufacturing a string-shaped magnet having a plurality of magnetized portions arranged in the longitudinal direction of a string-shaped body made of a flexible material containing magnetic powder or magnetic substance, comprising magnetizing the string-shaped body with N poles and S poles alternately in the longitudinal direction by a magnetizer, the method comprising the steps of: The polarities of the magnetized portion are arranged such that N poles and S poles are alternately arranged in the longitudinal direction, and the N poles and S poles are arranged on either side of a polar boundary surface that divides the cord-like body in at least two radial directions, A magnetization method characterized in that the cable-like body is twisted in a twisted state and the magnetic powder or magnetic material is magnetized by continuously or intermittently passing the cable-like body through the magnetizer, and the position of the neutral line formed at both radial ends of the polar boundary surface after the twisted state is released changes in the longitudinal direction of the cable-like body.

9. A magnetization method for manufacturing a string-shaped magnet in which magnetized and non-magnetized parts are alternately arranged in the longitudinal direction of a string-shaped body made of a flexible material containing magnetic powder or magnetic substance, comprising: magnetizing N poles and S poles alternately in the longitudinal direction of the string-shaped body by a magnetizer, the polarity of the magnetized portion is opposite in the longitudinal direction sandwiching the non-magnetized portion and also opposite in the radial direction sandwiching a polarity boundary surface that divides the radial direction of the cord-like body in at least two halves, A magnetization method characterized in that the cable-like body is twisted in a twisted state and the magnetic powder or magnetic material is magnetized by continuously or intermittently passing the cable-like body through the magnetizer, and the position of the neutral line formed at both radial ends of the polar boundary surface after the twisted state is released changes in the longitudinal direction of the cable-like body.

10. 10. The magnetizing method according to claim 8, wherein the position of the neutral line varies stepwise in a spiral manner in the longitudinal direction of the cable.

11. 10. The magnetizing method according to claim 8, wherein the position of the neutral line varies continuously in a spiral shape in the longitudinal direction of the cable.

12. 10. The magnetizing method according to claim 9, wherein a length of the non-magnetized portion in the longitudinal direction is shorter than a length of the magnetized portion.

13. A string-like magnet manufactured by the magnetization method of claim 8 or 9, or a magnetic therapeutic device such as a magnetic necklace or a magnetic mattress using the string-like magnet.

14. 10. The magnetizer used in the magnetization method of claim 8 or 9, characterized in that the magnetizer has a through hole for passing the cable through and a plurality of magnetizing yokes arranged along the inner surface of the through hole, N-pole magnetizing yokes that magnetize N-poles and S-pole magnetizing yokes that magnetize S-poles are arranged alternately along the longitudinal direction of the through hole, the N-pole magnetizing yokes and the S-pole magnetizing yokes are arranged opposite each other with the through hole therebetween, and the angle of a partition portion that separates the N-pole magnetizing yoke and the S-pole magnetizing yoke in the radial direction of the through hole changes continuously along the longitudinal direction of the through hole.

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