JP2003182276A - Magnet holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnet holder having a strong magnetic attraction force, easy to detach, having a magnetic attraction force even on the surface side thereof in the state attracted to an object to be noticed and good in user's convenience, and to provide a reutilization method inexpensive and reducing environmental load though an expensive rare earth magnet is used coupled with a simple structure by enabling the reuse an recycling of a sintered magnet scrap. <P>SOLUTION: The magnetic attraction surface of a main body made of a non-magnetic material is formed so as to have an outwardly projected curved surface on one side thereof and a recessed curved surface on the opposite side thereof and the rare earth magnet is embedded in the central part of the main body directly or through a yoke made of a soft magnetic material so that the magnetic pole surface thereof becomes a position the same as both surfaces of the main body or slightly recessed therefrom. By this constitution, the magnet holder is made easy to detach and has strong magnetic attraction force on both surfaces thereof. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention fixes a piece of paper or the like using a strong rare earth magnet to the surface of a household electric appliance such as a steel refrigerator or an office equipment such as a whiteboard or a cabinet by using magnetic attraction. Related to the magnet holder used for. Even though the holding power is increased by using a particularly strong rare earth magnet, the magnet holder itself can be easily attached and removed, and the paper pieces such as memos can be attached and detached with one touch without removing the magnet holder. By giving a strong magnetic attraction force, papers fixed with a binder clip or the like can be easily held by attracting the binder clip to the upper surface thereof. Furthermore, it is designed so that it can be easily removed even if it is accidentally flipped over.

[0002]

2. Description of the Related Art Paper such as memos and posters on steel devices (hereinafter referred to as posted objects) such as side surfaces and doors of office equipment such as whiteboards and steel cabinets and home appliances such as refrigerators ( Hereinafter referred to as a bulletin board)
A magnet holder utilizing magnetic attraction is widely used for the purpose of fixing. Most of the magnets used in such magnet holders are ferrite magnets. Ferrite magnets are cheap, but their magnetic force is weak,
There is a problem that the size and the number of posted objects that can be fixedly held on the posted object are limited, and on the other hand, if an attempt is made to increase the holding force, a large magnet is required, and the area to be covered up increases. Further, in such a magnet holder having a simple structure, for example, when trying to fix an object to be posted, it is necessary to remove the magnet holder, press these objects to be fixed, and place the magnet holder on the object.

Therefore, a magnet holder having a clip function has been developed and put on the market in order to eliminate the inconvenience. In such a magnet holder, it is possible to fix and remove the object by simply opening and closing the clip without removing the magnet body. However, the clip part consists of crocodile and spring, and if you include the magnet, the yoke, and even the joint that connects the clip to the yoke, the number of parts is large, the structure is complicated, and it takes time to assemble, so most of them are Despite the use of inexpensive ferrite magnets, the cost was high.

Recently, a magnet of a type in which an Nd-based magnet is combined with plastic has been developed and put on the market. For example,
In Japanese Patent Laid-Open No. 11-11072, a taper is provided on a part of the bottom surface of a bar-shaped plastic, and the upper surface is pushed,
A magnet holder is also disclosed in which the other side is lifted, a gap is made between the surface of the posted object made of a magnetic material such as a whiteboard or a steel cabinet, a piece of paper is sandwiched, and then the hand is released and fixedly held. ing. Alternatively, instead of the bar-shaped plastic, a taper part is provided on a part of the bottom surface of the disk-shaped plastic, and a taper part is combined with the Nd-based magnet to develop and commercially available one having the same function.

[0005]

In a commercially available magnet holder incorporating a magnet in a plastic, for example, as shown in FIG. 9, the bottom surface of the main body 50a forms a constant angle with the flat magnetic attraction surface 50b. Taper part 5
It is formed by two surfaces of 0c, and the magnet 29 is located only on one side of the line 50d of intersection of the two surfaces. And in FIG.
By pushing the upper part on the right side of the side view of (c), the magnetic attraction surface in which the magnet is embedded is lifted up with the intersection line 50d of the two surfaces as a fulcrum. Therefore, when the upper surface of the tapered portion is pushed, when a certain force or more is applied, the magnet suddenly separates from the posted object, and the momentum causes the tapered surface to hit the posted object, and a sound is emitted by the shock. As described above, there is a problem that the movement is not smooth and a harsh sound is emitted.

Further, the magnet holder in which the Nd type magnet is embedded in the plastic is suitable for pressing and fixing a paper piece or the like from its upper surface, but since it is covered with the plastic except the magnetic attraction surface, Except for the attracting surface, the magnetic attraction is extremely weak, and despite the fact that a strong Nd-based magnet is used, for example, paper fixed with general-purpose fixing parts such as binder clips and Gem clips is used to remove these iron clips. There was an inconvenience that it could not be used and held.

By the way, Japanese Patent Laid-Open No. 2000-318362 or 2001-113870 discloses that
As shown in (a) and (b), the bottom surface of the magnet is composed of two flat surfaces 51b, 51c or 52b, 52c forming a constant angle, or as shown in (c) and (d), the bottom surface is magnetized. A "seesaw-type magnet holder" having protrusions 53d and 54d on the attracting surface is disclosed. With the magnet having such a configuration, when the post is inserted from the lower side in the use state, the upper end of the post stops at the fulcrum and does not go further into the interior. Even in such a state, it can be held without any problem when the thickness of the post is small, such as several sheets. However, when the number of sheets increases and the thickness becomes thicker, when the bulletin board is inserted, the magnet on the opposite side (upper side) from the fulcrum acts to lift the holding side (lower side) conversely, so the restoration in the direction of holding the bulletin board The force suddenly decreases. further,
The fulcrum is always in contact with the object, magnetic attraction is dispersed, and the holding power of the object is weakened. Therefore, there is a drawback that the holding force is relatively small while using a magnet having a large bending angle and a large volume.

The magnet holder of the present invention has been devised in view of the above problems, and its purpose is to have a large magnetic attraction force and, at the same time, to easily remove it from the object, so that a memo or the like can be made with one touch. It is possible to attach and detach the paper piece of, and also to give the magnetic adsorption force to the upper surface, even for paper fixed with a steel paper piece fixing tool such as a binder clip or a paper clip, just bring these parts close to the upper surface of the magnet holder, It is to provide a multi-purpose magnet holder that can be magnetically attracted with sufficient strength. And, when the magnetic attraction force is applied to the upper surface in this way, if it is reversed by mistake, it is easy to get rid of the problem that it is difficult to remove, but it is to provide a magnet holder that also solves such a problem. .

Furthermore, recycling and reuse of Nd-based magnets that are useful in reducing the environmental load by effectively utilizing a large amount of Nd-based magnet scraps generated in the Nd-based magnet production process or from electronic equipment such as used home appliances and personal computer peripherals. Establishing technology.

[0010]

In order to achieve the above object, a magnet holder of the present invention has a main body made of a non-magnetic material, and a magnetic attraction surface is a convex curved surface or a part thereof is a flat surface and both sides thereof are curved. Surface is formed, the upper surface is formed as a concave curved surface, and the rare earth magnet is in the main body, and the magnetic pole surface is directly or through a yoke made of soft magnetic material at a position almost the same as or slightly recessed on both surfaces of the main body As described above, it is embedded.

More specifically, the magnet holder of the present invention has a main body, for example, as shown in FIG. 1, which is drawn by the third trigonometry in a state in which the magnet holder is placed on a horizontal plane with its attracting surface facing downward. In the front view, (a) the lower side forms a smooth curve with a downward convex shape, and the contour line of the upper surface is a concave curve upward, and in the side view, (b) the lower contour line is It is a straight line tangent to the horizontal line, and (c) the rare earth magnet is located in the center of the side view, and is embedded so that its magnetic pole surface is the same as or slightly recessed from both surfaces of the main body. Characterize. Although various shapes are selected as the shape of the plan view (a), a circular shape is shown in FIG. 1 as a typical example.

Alternatively, as shown in another example in FIG.
Instead of the magnetic attraction surface being formed of a curved surface, the vicinity of the central portion is formed of a curved surface forming a flat surface whose width is less than 1/3 of the width of the main body.

As described above, since the magnetic attraction surface is formed as a curved surface that is convex outward, it easily swings while being attracted to the object to be posted, and for example, the end portion of the upper surface having a gap in the bottom surface is forefinger. The structure is such that the magnet holder can be easily raised by pushing with and pushing the other end with the thumb. In the state of standing up, it is easy to grasp with both fingers, and since the magnetic attraction force is almost lost, it can be removed very easily.

In addition, the magnet holder of the present invention is placed on the posted object so that the swinging direction is the vertical direction in the actual use state, the upper part is held by the finger and the lower side is lifted, and the upper end of the posted object such as memos. It can be fixed by inserting the part from the lower side and then releasing the finger. It can be removed by lifting the lower side in the same way. In this way, desorption is extremely easy.

In the magnet holder of the present invention, especially when the magnetic attraction surface is a curved surface, the fulcrum is located at the center of the magnet, and the force required for rocking is extremely small. Also, when a part of the center of the magnetic attraction surface is configured by a flat surface,
Its width is narrow, and it can be swung with a small force by the lever principle. Further, as the fulcrum moves along with the swing, and the magnetic attraction force continuously decreases with it, it is possible to swing extremely smoothly. Therefore, no sound is generated which is generated when the magnetic attraction surface is pushed and released like the existing magnet holder in which the magnetic attraction surface is a flat surface.

On the other hand, in the magnet holder according to the present invention, since the magnetic attraction surface is a curved surface, the magnet holder can be rocked by a small force with a small force even though it has a strong magnetic attraction force. The center point of the magnet can be easily lifted up on the posted object even if the posted object is thick and the posted object is thick, and the holding force can be increased. Also, when a part of the center of the magnetic attraction surface is formed by a flat surface, its width is narrow, and it is rocked by a relatively small force by the lever principle, and since the other surface is formed by a curved surface, It is possible to lift the center point of the magnet from the surface of the posted object.

Secondly, the magnet holder of the present invention is characterized in that the side opposite to the magnetic attraction surface is formed as a concave surface.
In the case of a magnet holder in which the magnetic attraction surface is a convex curved surface and the remaining surface is a flat surface, when the flat surface is attracted to the object, magnetic attraction force is applied to both surfaces like the magnet holder of the present invention. In that case, there arises a problem that removal becomes difficult. In particular, since the rare earth magnet has a strong holding force even if it is small, the magnet holder as a whole can be made compact and thin. However, in such a magnet holder, a situation in which the front and the back are reversed can sufficiently occur in daily use.

In the magnet holder of the present invention, even when the concave side is attracted to the object to be posted, the magnetic attraction is small because the magnetic poles are separated from the object to be posted. Moreover, particularly by selecting a plane shape such as a circle, an ellipse, a hexagon, or an octagon, it is possible to swing in a lateral direction (a direction perpendicular to the swing direction of the magnetic attraction surface). The magnetic attraction can be weakened, and a large gap is created in the lower part of the lifted part, which makes it easy to grip and can be removed very easily. Further, since the upper surface is formed as a concave curved surface, when pushing the upper end portion of the magnet holder for detaching or inserting / removing the posted object, it is easier to push with a finger than when it is flat, and usability is improved.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the greatest feature of the magnet holder of the present invention is that first, all or part of the magnetic attraction surface is a flat surface, and most of the magnetic attraction surface is a curved surface. Next, the reason why the magnet holder of the present invention has a strong magnetic attraction force on both upper and lower surfaces will be described. In the magnet holder of the present invention, for example, the upper end portion of the paper is fastened with a binder clip, and the steel clip portion can be easily attached and detached. Fasteners such as binder clips are very widely used and have a strong holding power for paper. A magnetic force works when it is held on a magnet, and suction is held only by bringing it closer, and when it is released, the purpose can be achieved by simply grasping and pulling the paper. Therefore, for example, by fixing the magnet holder of the present invention to the side of a desk made of steel and attaching or detaching a frequently used bulletin board such as an in-house telephone directory, there is no problem even if it deviates slightly from the target, and it is extremely easy to use. Becomes In other words, it becomes convenient because the object can be achieved by groping while sitting on a chair.

Next, the shape of the lower convex curve in the front view will be described in more detail. (First Embodiment) As a specific shape of a curve, for example,
It can be an arc. Alternatively, by setting the radius of curvature in the vicinity of the center point C shown in FIG. 1B to be larger than the radius of curvature of its peripheral portion, for example, a rectangular parallelepiped magnet with a flat magnetic pole surface is placed inside the surface of the magnet holder. Even when the magnet is embedded as described above, it is possible to increase the magnetic attraction force by reducing the distance between the post and the magnet over a wider area. Furthermore, more desirably, the curve may be such that the radius of curvature of that portion continuously decreases as the distance from the center point C increases. As an example of such a shape, it is possible to use a curve including a portion having the largest radius of curvature of the ellipse. Or you can choose a parabola. If you select such a curve shape,
When actually used, when pushing and swinging one side of the upper surface of the magnet holder to insert and remove the bulletin board and attach and detach the magnet holder, the movement becomes smooth,
Good usability.

The shape of the curved surface of the bottom surface makes it easy to put a finger on it when it is rocked in consideration of ease of removal. Therefore, an appropriate gap is formed between the end of the bottom surface of the lifted portion and the posted object. Decide to grow. As a result of prototyping various shapes of magnet holders and studying their ease of removal, as shown in Fig. 1 (b), the angle formed by the tangents to the curved surfaces at both ends to the plane, that is, swinging for removal It has been known that it is desirable to select the angle θ (hereinafter, referred to as the swing angle θ) when it is made to fall within the range of 10 to 45 degrees. More preferably, it is selected from the range of 10 to 40 degrees. Reference numeral 31 in the figure is a yoke made of a soft magnetic material. The yoke will be described in detail later.

(Second Embodiment) In another example of the magnet holder of the present invention, as shown in the front view of FIG. 2 (b), the third trigonometric method with the attracting surface facing down is placed on the horizontal plane. The shape of the main body drawn in Fig. 2 is formed by a straight line with the central part on the lower side in contact with the horizontal line and a smooth curve with the left and right sides protruding downward. Three-dimensionally, only the central portion of the convex curved surface of the suction surface of FIG. 1 is configured by a flat surface.

The width of the central flat portion is 1/3 of the width of the main body.
Less than This is because if it is ⅓ or more, a large force is required when pushing and swinging one side of the upper surface of the magnet holder, which makes removal difficult. Further, it is desirable that the width of the flat portion is 1/4 or less of the width of the main body. When a rectangular parallelepiped magnet is embedded, as will be described later, the width of the flat portion should be equal to or slightly larger than the lateral width of the magnet so that the entire surface of the magnetic pole of the magnet matches the level of the surface of the main body. It becomes possible to maximize the magnetic attraction force and at the same time widen the swing range.

Japanese Patent Laid-Open No. 11-11072 discloses a magnet holder provided with a chamfered portion along the back surface or the outer peripheral edge of the main body. However, the chamfered portion is provided for the purpose of making it easy to insert the sheet, and its width is also narrow. According to the present invention in which the chamfered portion is wide or the entire surface is formed of a curved surface or a curved surface including a part of a flat surface, smooth swinging is possible, and removal of the magnet holder from the posted object is extremely easy. No mention is made of any particular function occurring.

Next, the plan view shape of the magnet holder body will be described. As the shape of the main body of the present invention, a circular shape is selected as a typical shape in a plan view drawn with the magnetic attraction surface facing downward on a horizontal plane. When the plane shape is circular,
The diameter is preferably 10 mm or more. The magnetic energy product showing the magnetic attraction force of the rare earth magnet is large, and the magnetic energy product suitable for embedding in the main body having a diameter of 10 mm is, for example, 5
This is because a magnet having a size of less than about mm has a sufficient holding force, but if the diameter of the main body is too small, it is difficult to grip and it is difficult to remove. More preferably, the diameter is 15 mm or more. The magnet holder of the present invention has a large diameter, and even if a large magnet is embedded in proportion thereto, it is easy to remove, so the maximum diameter is not particularly specified. However, even if it is small, it has sufficient magnetic attraction force, and as it increases,
The area to cover up when fixing the posted object to the posted object increases,
In addition, since the cost performance is reduced, the diameter is 50m
As a guideline, do not exceed about m.

(Third Embodiment) Or, as shown in FIG. 3, an octagon or hexagon with mirror symmetry in left, right, up and down is selected as a desirable shape. This is because, in the case of such a planar shape, in combination with forming the opposite side to the magnetic attraction surface with a concave surface as in the present invention, even when the opposite side is attracted, the magnetic attraction surface shakes. This is because it can be swung in the direction of movement and 90 degrees, and can be easily removed. Further, the circular shape is the simplest shape, and it is easy to manufacture it by a method such as an injection molding method including the manufacture of a mold. On the other hand, octagons and hexagons are also excellent in design. Although FIG. 3 shows an example in which octagonal sides are located vertically and horizontally in the plan view, octagonal points are located vertically and laterally in the plan view when rotated by 45 degrees. The example is also recommended as a more preferable shape. The same applies to hexagons. The planar shape of the magnet holder of the present invention is not limited to these shapes, and may be an elliptical shape within a range in which the ratio of the major axis to the minor axis does not greatly deviate from 1, for example. Alternatively, a rectangle can be selected.

As a plan view shape, a hexagon or octagon that is mirror-symmetrical with respect to the vertical center line and at the same time is also mirror-symmetrical with respect to the center line orthogonal thereto, for example, regular hexagon or regular octagon It is possible to cite a graphic that is enlarged or reduced at a fixed ratio in the horizontal direction. However, since the symmetry increases, the deformation rate of expansion or contraction at that time is within 0.7 to 1.4, more preferably 0.8.
It is desirable to be within 1.2.

In the case of an octagon, a regular tetragon or a rectangle obtained by stretching it in one direction is used as a basic shape, and its four corners are cut so as to be mirror-symmetrical with respect to the longitudinal and lateral centerlines of the rectangle. The shape can also be selected as the desired shape. Also in this case, it is desirable that the range in which the basic rectangle does not greatly deviate from the regular square, that is, the ratio 1 / s of the long side 1 and the short side s of the rectangle is 1.4 or less.

The size of these hexagons and octagons is the same as in the case of a circle, and if they are too small, they will be difficult to grip and will be difficult to remove. Therefore, of the width W ₁ in the front view and the width W ₂ in the side view. The smaller value is 10 mm or more, more preferably 15 mm or more. The maximum size is not particularly specified, but for the same reason as in the case of the circular shape, the larger value of W ₁ and W ₂ is set to about 50 mm or less as a guide. In the present invention, the front view shape and the side view shape are the most important, and as described above, the plan view shape is not limited to the above example.

In the magnet holder of the present invention, when the downward convex curve on the lower side and the concave curve on the upper side in the front view are mirror-symmetrical with respect to their respective center lines, there is no distinction between upper and lower directions. The usability can be improved. In addition, although examples of curves that already include arcs or ellipses and have the largest radius of curvature have been given as examples of these curves, these curves satisfy the condition of being mirror-symmetric with respect to the center line. (Fourth Embodiment) On the other hand, when the position of the magnet is shifted from the center of the front view as shown in FIG.
(B) The swing angle θ ₁ on the right side of the front view becomes larger than the swing angle θ ₂ on the right side, and the swing range in the left direction is expanded. Moreover, the pressing force for lifting the magnet holder by the lever principle can be small, and it is more suitable for the application in which the clip function is emphasized. In this way, such a magnet holder is included in the present invention because it can be used properly according to the purpose.

Next, the rare earth magnet embedded in the central portion of the main body of the magnet holder of the present invention will be described. As these magnets, for example, rectangular parallelepiped magnets magnetized in the thickness (height) direction can be used. When the dimensions of the magnet are vertical width a × horizontal width b × thickness c, and a> b, and the magnetizing direction is the thickness c direction, the left and right sides of the front view as in the example shown in FIGS. The magnet is embedded in the main body so that the direction is the b direction, that is, the lateral direction is the a direction in the side view. With such a configuration, it is possible to widen the curved surface and thus the swinging range, and the usability is improved.

(Fifth Embodiment) Alternatively, as shown in FIG. 5, a so-called arc segment-shaped magnet having a C-shaped cross section, which is similar to that used for forming a magnetic field of a motor, can be used. The drawing shows an example in which a yoke having such a shape is used and a yoke is arranged on the upper surface, as in FIGS. 1 to 4. Since such an arc segment-shaped magnet is formed with curved surfaces on both sides, it can be used as it is according to the curved surface of the magnet holder of the present invention.

Next, the shape of the soft magnetic material yoke used in the magnet holder of the present invention will be described. In the magnet holder of the present invention, a yoke made of a soft magnetic material is arranged on one side of the rare earth magnet, and in this case, the dimensions of the yoke and the dimensions of the rare earth magnet are compared. Is smaller than the horizontal dimension of the rare earth magnet, and the horizontal dimension of the yoke is larger than the horizontal dimension of the rare earth magnet in the side view, or (a) in the front view, the horizontal dimension of the yoke is the horizontal dimension of the rare earth magnet. The size of the yoke is larger than the size of the magnet in the left-right direction, and in the side view, the size of the yoke in the left-right direction is smaller than the size of the rare-earth magnet in the left-right direction, and (b) the outside of the yoke is almost flush with the surface of the magnet holder body. Can be embedded in.

The yoke material is, for example, JIS
Electromagnetic soft iron plate and JIS G3141 specified in C2504
It is possible to use the cold-rolled steel sheet specified in 1. Alternatively, ferritic stainless steel such as SUS430 which is magnetic stainless steel can be used. Especially SUS4
A ferritic stainless steel having a reduced content of interstitial impurity elements such as C and N such as 44 can be selected as a more optimal material. In particular, ferritic stainless steel has excellent corrosion resistance and has an advantage that it can be used without surface treatment such as plating.

In the magnet holder shown in FIGS. 1 to 4, the yoke is arranged such that the horizontal dimension of the yoke is slightly larger than the horizontal dimension of the magnet in the front view, and is slightly smaller than the magnet in the side view. An example was given. By selecting the yoke having such a size, the magnet and the yoke can be firmly fixed to the main body at the same time by utilizing the magnetic attraction force of the magnet. This is because, even if the magnet is to be removed from the main body, the yoke that is strongly attracted to the magnet is caught by the main body, while when the yoke is pulled out, the magnet is caught by the main body and cannot be separated from the main body. Contrary to FIGS. 1 to 4, the same can be done by making the size in the left-right direction smaller than that of the magnet in the front view and making the size in the left-right direction larger than that of the magnet in the side view as in the example of FIG. The contact area between the magnet and the yoke is preferably 50% or more, and more preferably 60% or more of the surface area of the magnet in order to increase the attraction force between them.

In order to manufacture the magnet holder having such a structure, a body having a cavity formed in accordance with the magnet and the yoke shape is manufactured in advance by a method such as injection molding, and the magnet and the yoke magnetized in the respective cavities. Just insert. In this way, it can be manufactured extremely easily.
Alternatively, when the main body is injection-molded, the magnet and the yoke may be integrally molded. The magnet may be magnetized by fixing the magnet to the main body and then inserting the entire magnet holder into the magnetizer.

In the magnet holder of the present invention, the yokes made of a soft magnetic material are arranged on both sides of the rare earth magnet, and the yokes are embedded in the main body so that the outside of the yoke is substantially flush with the surface of the main body of the magnet holder. You can also In the case of such a configuration, when the yoke having the same size and shape as the case where the yoke is arranged on one side is arranged, and on the other side, for example, a rectangular parallelepiped magnet of horizontal a × vertical b × thickness c is used. (However, magnetized in the direction of a> b and thickness c), the yoke shape is defined as horizontal a'x vertical b'xc 'and a'> a, b '
By setting ≧ b or a ′ ≧ a, b ′> b, it becomes possible to attach a separately prepared magnet or yoke to the main body after manufacturing the main body by a method such as injection molding.

(Sixth Embodiment) Alternatively, when the yokes are arranged on both sides, as shown in an example in FIG. 6, even if the yokes on both sides are increased in the left-right dimension in the front view or the side view, The magnet and the yoke can be fixed to the main body only by the attractive force. Further, after the main body is made by a method such as an injection molding method, the magnet and the yoke can be attached. If the magnet and the yoke are integrally molded when molding the main body, these members can be firmly fixed to the main body even if the yoke shape is smaller than the size of the magnet. Not limited to. When a magnet having a rectangular parallelepiped shape is used, for example, by making the shape of the yoke arranged on the magnetic attraction surface side in conformity with the curved surface of the main body, it is possible to provide a magnet holder with smooth swing.

In the case of a magnet holder in which a concave portion is provided on the back surface of an existing plastic body and an Nd-based magnet is fixed to that portion with an adhesive, the magnetic attraction force of the Nd magnet is extremely strong, so that the number of times of attachment / detachment is increased, and The strength of the adhesive did not withstand the force of attraction to the body, and the adhesive was peeled off, or the magnet plating film was peeled off, and the problem of being unusable was likely to occur. In the case of the magnet holder of the present invention in which the yoke having the dimensions as described above is arranged, the magnet is held even by the magnetic attraction force on the yoke, and it is not necessary to worry about such a problem.

When the yokes are arranged on both sides of the magnet, the magnet is not exposed to the outside. Rare earth magnets are generally brittle and have poor corrosion resistance. Usually Ni
Although surface treatment such as plating is performed, depending on the usage state of the magnet holder, if the magnet is exposed, the plating may peel off and rust may occur. With the above structure, the magnet is not exposed from the surface, and the durability can be further improved.

Further, in the case of a yoke made of a soft magnetic material, the workability is good, and it is easy to form the yoke in conformity with the surface shape of the magnet holder body. This also increases the degree of freedom in the shape of the magnet. For example, even in the case of using a simple rectangular parallelepiped magnet, if the side exposed on the surface of the yoke is made to match the surface shape of the main body as in the example shown in FIG. 6, the magnet can be swung smoothly for removal. Will be able to be a holder.

The rare earth magnet used in the magnet holder of the present invention is not limited to one, but two or more rare earth magnets may be stacked in the thickness direction. In general, rare earth magnets are often magnets that are thin in the magnetizing direction for their size, and with this structure, used magnets and scraps generated during the magnet manufacturing process are reused as raw materials. In this case, the range of materials that can be used is expanded, and material costs can be reduced.

(Seventh Embodiment) Further, as shown in FIG. 7, both magnetic pole surfaces of a rare earth magnet are sandwiched between two yoke plates made of a soft magnetic material, and the end faces of the yoke plate are both of the magnet holder body. It is also possible to configure so that it is exposed on the same plane as the surface. In the case of magnets other than this method, the magnetizing direction is all in the thickness direction of the magnet holder body, whereas in this method the magnetizing direction is perpendicular to the thickness direction of the body, N on both surfaces
The difference is that both the pole and the S pole appear.

Further, in the above method, the magnet is designed to be completely embedded in the main body by designing the magnet so that it does not protrude from the yoke. Since the magnet is shielded from the outside air in this manner, the magnet does not corrode even if it is not plated, and the manufacturing cost can be reduced. Strictly speaking, it suffices to select a magnet having a shape and size that does not protrude from only the upper end surface and the lower end surface of the yoke, and all such magnets can be used in the magnet holder of this system. Also, two or more thin magnets can be stacked and used. Alternatively, they can be used side by side in parallel. In this way, widening the selection range of the magnets is also a great advantage of the magnet holder of this system.

As in the example shown in FIG. 7, when the end face of the soft magnetic material yoke is formed into a curved surface by fitting it to the main body, it is possible to swing with an extremely small force, and a sufficient magnetic attraction force is obtained. The usability is further improved.

By the way, most of Nd type magnets of typical rare earth magnets are used for a voice coil motor (VCM) which is a drive mechanism of a head of a hard disk drive. And, in the case of the VCM magnet, the quality is strict and the occurrence rate of nonstandard products is large. Therefore, the ratio of VCM magnets in magnet scraps is overwhelmingly large. In addition, the recovery and reuse of VCM magnets from used HDDs is also an important issue. However, in the case of a VCM magnet, it has a special fan-shaped shape, a disk shape,
It is more difficult to recover and reuse than a magnet with a relatively simple shape such as a ring shape or a rectangular parallelepiped shape.

In the case of the magnet sandwiched between the yokes, for example, the magnet cut out from the VCM magnet as shown in FIG. 8 can be effectively used. Figure 8 (b) shows the VC of the magnet
This is a method of cutting out a straight line by using the outer radius portion of the M magnet as it is, and FIG. 8C is for the purpose of improving the cutting yield, and is substantially parallel to the radius portion of the VCM magnet.
For example, it is a method of cutting out into a curved shape by a method such as wire cutting and further dividing it and using it as a small piece magnet,
FIG. 8 (d) shows a method in which importance is attached to cutting efficiency and cutting is first performed by a multi-saw to finally obtain a rectangular parallelepiped magnet. The rectangular parallelepiped magnets obtained by the cutting method of FIG. 8 (b) or 8 (d) are the same as those of FIG. 1, FIG. 2, FIG. 3, FIG.
It can be used for a magnet holder of the type using a rectangular parallelepiped magnet shown in FIG. The curved magnet piece with one end having a convex shape obtained by the cutting method of FIG. 8B or the arc-shaped magnet piece obtained by the cutting method of FIG. It is desirable to use it for the magnet holder.

As rare earth magnets industrially produced, there are SmCo type magnets in addition to Nd type magnets. The former is more suitable as the magnet holder of the present invention because it has better magnetic properties, is cheaper and has better mechanical properties. These rare earth magnets are generally manufactured using powder metallurgy. That is, the raw material alloy is manufactured through processes such as fine pulverization, magnetic field molding, sintering, heat treatment, and surface treatment. The magnet holder of the present invention can also be manufactured using the same method. Further, as shown in the example of the VCM magnet, the magnet scrap produced in the magnet manufacturing process due to defective plating, cracking at the corner, defective dimension, etc. can be manufactured by cutting or grinding. it can. Alternatively, it is possible to use the magnet scrap taken out from the used equipment.

When a rare earth magnet is used for office supplies such as the magnet holder of the present invention, quality standards for magnetic properties are extremely loose and dimensional accuracy is loose as compared with industrial applications. Further, in the case of the magnet holder of the present invention, various shapes and sizes can be used, and it is suitable as a method for reusing rare earth magnet scrap.

Conventionally, as a method of recycling such Nd-based magnet scrap, a re-melting method (eg, JP-A-08-3
1624) and a technique of crushing and returning to the magnet manufacturing process (eg, Japanese Patent Laid-Open No. 06-340902).
However, since the yield is extremely low and the characteristics of the obtained magnet are deteriorated, it cannot be said that it is actually established as an economical method. In order to reduce the load on the global environment, it is desired to establish an effective recycling technique and a reuse technique for these Nd-based magnets, and the present invention also complies with such a point.

Nd-based magnets are generally chemically active N
In addition to d, rare earth elements such as Dy and Pr are added in an amount of 30 to 32
Since it is contained in an amount of about wt%, the corrosion resistance is generally poor. Therefore, it is desirable to take rust prevention measures such as nickel plating after cutting and grinding. In addition, depending on the Nd-based magnet, a magnet containing Co is becoming mainstream for the purpose of improving corrosion resistance and heat resistance, and in such a magnet,
In particular, when used as a magnet holder as in the present invention, a method such as painting can be used without nickel plating.

In particular, the two pole plates of the rare earth magnet are sandwiched between two yoke plate members made of a soft magnetic material, and the end faces of the yoke plate members are exposed so as to be flush with both surfaces of the magnet holder body. In this case, since the magnet is embedded in the plastic body and does not come into direct contact with the outside air, it can be used sufficiently without surface treatment such as nickel plating.

Plastic is suitable for the main body made of non-magnetic material of the present invention. As the plastic material, acrylic, polypropylene, vinyl chloride, polycarbonate, or the like can be used.

The embodiment of the magnet holder of the present invention will be described in more detail below with reference to examples.
The following two types of methods were adopted as the method for measuring the holding force of the manufactured magnet holder.

(Test Method 1) As a simple and practical method, using a white board made of steel set in the vertical direction, the A4 size copy paper is pressed by a magnetic holder to fix the number of papers. I checked if it could be retained. The A4 size paper used in the test had a weight of 4.2 g and a thickness of 0.083 mm.

(Test Method 2) The same copy paper as used in Test Method 1 was clamped at the upper end with a binder clip, and the portion of this clip was magnetically attracted to the upper surface of the magnet holder fixed to the whiteboard. I checked if I could hold. However, the binder clip is the smallest among the commercially available office supplies (manufactured by Lion Office Equipment Co., Ltd .: Binder Clip No.
105) was selected. Further, it was examined how many A4 size sheets could be held in the same manner by using a paper clip instead of the binder clip. As the paper clip, a paper clip having a width of 6.3 mm and a length of 23.5 mm, which is widely used as an office article, was used. However, the number of sheets of paper that can be fixed and held by the binder clip and the paper clip used in the test are about 60 sheets and 20 sheets respectively. If the number of sheets exceeds this value, the paper will drop with the clip remaining in the magnet holder. In each case “≧ 6
"0 sheets" and "≥20 sheets" are displayed.

[0057]

(Example) (Example 1) (See FIG. 1) The orientation direction is the thickness direction, and the dimensions are 3 mm in thickness x 5 mm in width x
A rectangular parallelepiped Nd-based magnet 21 having a length of 16 mm and a yoke 31 cut out into a rectangular shape having a width of 7 mm × 14 mm using a steel sheet of ferritic stainless steel SUS444 having a thickness of 1.5 mm were prepared. Next, using a silicone rubber mold prepared in advance, a commercially available polyester resin (“Polytel” manufactured by Tsukushi Resin Handicraft Laboratory Co., Ltd.)
Then, a main body 11a for a magnet holder having a shape schematically shown in FIG. 1 was produced. When casting, the magnet 2
It was built so that the part where 1 and the yoke 31 are set becomes a cavity. The diameter of the main body 11a in the plan view of FIG. 1A is 30 mm, and the lower curve of the main body 11a in the front view of FIG.
mm, the peripheral part has a smooth curve of about 25 mm, the upper curve of the main body 11a has a curved surface with a radius of curvature of about 40 mm, and the central part has a thickness of 4.8 mm. The swing angle θ was about 29 degrees. afterwards,
The yoke 31 was set in the concave cavity of the main body 11a, and the magnetized magnet 21 was set in the convex cavity to obtain the magnet holder 11.

With respect to the magnet holder 11, the holding force was examined by the test methods 1 and 2. As a result, as shown in Table 1, it was found that Test Method 1 has a sufficient holding power of 17 A4 sheets. In particular, in Test Method 2, 45 sheets of A4 paper are used for binder clips, and A4 paper is used even when fastened with small fasteners such as paper clips.
It was found that 18 sheets of paper could be fixedly held, and it was found to have a strong holding power. Moreover, even though it has such a strong holding force, even when it is fastened directly to the whiteboard without using paper, the magnetic attraction surface is formed by a curved surface convex downward, It was easy to do, and the upper part of the end with a gap on the bottom surface was pushed with the index finger, and at the same time, the other end was lifted with the thumb, so that the magnet holder was raised, grasped with both fingers, and easily removed.
Further, it was found that by pushing the upper end in a state where the magnet holder is attracted to the object to be posted, the object to be posted can be extremely easily inserted and removed. Furthermore, even though the opposite side of the magnetic attraction surface on the convex side also has a strong magnetic attraction force, when it is reversed, the magnetic attraction force weakens,
Moreover, since the magnetic attraction surface can be swung in a direction perpendicular to the swing direction, and the gap is widened, it is easy to grip and is extremely easy to remove.

[0059]

[Table 1]

Example 2 (See FIG. 2) A rare earth magnet 22 and a yoke 32 having the same shapes as in Example 1 were prepared. Further, the main body 12a was manufactured by the same manufacturing method. However, as shown in FIG. 2, the diameter of the main body 12a in the plan view (a) is 30 mm, and the lower curve of the main body 12a in the front view (b) is a straight line 1 having a width of 6 mm at a part of the central portion.
2c, the radius of curvature on the left and right is from 30mm to 25mm
The upper curve of the main body 12a is a straight line 1 having a width of 8 mm in the central part so that a smooth curve 12b is continuously changed.
2d, and the left and right sides of the curve 12e were shaped so as to form a curve 12e having a radius of curvature of about 40 mm, and the central portion had a thickness of 4.5 mm. The swing angle θ was about 28 degrees. Then, the yoke 32 was set in the concave cavity of the main body 12a, and the magnetized rare earth magnet 22 was set in the convex cavity to obtain the magnet holder 12.

With respect to the magnet holder 12, the holding force was examined by the test methods 1 and 2. As a result, as shown in Table 1, it was found that Test Method 1 had a sufficient holding power of 19 A4 sheets. In particular, in Test Method 2, it was found that 18 sheets can be fixedly held not only in the case of binder clips but also in the case of being fastened by small fasteners such as Zem clips, and it was found that they have a strong holding force. Further, it has been found that, despite having such a strong holding force, it is easy to swing on the posted object and is easy to remove. Further, it was found that by pushing the upper end in a state where the magnet holder is attracted to the object to be posted, the object to be posted can be extremely easily inserted and removed. Even when it was turned over, like the first embodiment, it was easy to remove.

(Example 3) (See FIG. 3)) The orientation direction is the thickness direction, and the dimensions are 3 mm in thickness × 6 mm in width ×
A rectangular parallelepiped Nd-based rare earth magnet 23 having a length of 12 mm;
Ferritic stainless steel SUS44 with a thickness of 1.5 mm
A yoke 33 was prepared by cutting the steel plate of No. 4 into a rectangle with a width of 7 mm × 10 mm. Further, the main body 13a was manufactured by the same manufacturing method as in Example 1. However, as shown in FIG. 3, in the plan view (a), the main body 13a has an opposite side of 25 mm.
(B) A lower curve of the main body 13a in the front view is a straight line 13b having a width of 8 mm at a part of the central portion, and the left and right sides of the straight line have a smooth curvature radius from 30 mm to 25 mm. The main body 22a so that the curved line 13c is formed.
The upper curve was a straight line 13d having a width of 8 mm at the center, and the left and right sides of the straight line were curves 13e having a radius of curvature of about 40 mm, and the thickness of the center was 4.5 mm. The swing angle θ was about 25 degrees. Then, the yoke 33 was set in the concave cavity of the main body 13a, and the magnetized rare earth magnet 23 was set in the convex cavity to obtain the magnet holder 13.

The holding force of the magnet holder 13 was examined by the test methods 1 and 2. As a result, as shown in Table 1, it was found that the test method 1 had a sufficient holding power of 15 A4 sheets. In particular, in Test Method 2, it was found that 17 sheets of A4 paper can be fixed and held not only in the case of binder clips but also in the case of being fastened by small fasteners such as paper clips, and it was found to have a strong holding force. . Further, it has been found that, despite having such a strong holding force, it is easy to swing on the posted object and is easy to remove. Also,
It was found that by pushing the upper end in a state where the magnet holder is attracted to the object to be posted, the object to be posted can be extremely easily inserted and removed. Even when inverted, it was easy to remove.

(Embodiment 4) (Refer to FIG. 5) From Nd-based magnet scrap, width 12 mm × length 12
A segment-shaped rare earth magnet 25 having a size of mm × thickness of 3.2 mm and an arc drawn with a radius of curvature of 40 mm was selected. The magnetic field orientation direction was the thickness direction. Also, a yoke 35 was prepared by cutting a ferritic stainless steel SUS444 steel plate having a thickness of 1.5 mm into a rectangular shape having a width of 10 mm and a length of 14 mm, and press-forming the curvature radius of 40 mm in the width direction. Further, the main body 15a was manufactured by the same manufacturing method as in Example 1. However, as shown in FIG. 5, (a) in the plan view, the main body 15a has a circular shape with a diameter of 30 mm, and (b) in the front view, the lower curve of the main body 15a has a radius of curvature of 40 mm in the central portion in accordance with the magnet shape, 3. The upper curve of the main body 25a has a radius of curvature of about 40 mm and the central portion has a thickness of 4. It was molded to be 5 mm. The swing angle θ was about 26 degrees. Then, attach the yoke 35 to the main body 15
A magnet holder 15 was obtained by setting the magnetized rare earth magnet 25 in the cavity on the concave side of a and setting it in the cavity on the convex side.

With respect to the magnet holder 15, the holding force was examined by the test methods 1 and 2. As a result, as shown in Table 1, it was found that the test method 1 had a sufficient holding power of 26 A4 sheets. In particular, in Test Method 2, it was found that 20 or more sheets of A4 paper can be fixed and held not only in the case of binder clips but also in the case of using small fasteners such as paper clips, and it has been found that they have a strong holding force. It was Further, it has been found that, despite having such a strong holding force, it is easy to swing on the posted object and is easy to remove. Further, it was found that by pushing the upper end in a state where the magnet holder is attracted to the object to be posted, the object to be posted can be extremely easily inserted and removed. Even when it was turned over, like the first embodiment, it was easy to remove.

Example 5 (See FIG. 7) Ferritic stainless steel SUS444 having a thickness of 1.2 m
Using a steel plate of m as a material, a rectangle with a width of 10 mm × 15 mm is cut out, and one end surface is ground into a convex shape with a radius of curvature of 35 mm and the other side is ground into a concave shape with a radius of curvature of 40 mm.
7a and 37b. A rectangular parallelepiped Nd-based rare earth magnet 27 having a thickness of 4 mm, a width of 5 mm, and a length of 10 mm is magnetized, and the yoke 3 is provided on both sides of the yoke 3.
7a and 37b were set, and the same polyester resin as in Example 1 was poured using a silicone rubber mold prepared in advance to prepare a magnet holder 17 having a shape schematically shown in FIG. The diameter of the body is 30 mm. Figure 7
The lower side of the main body in the front view of (b) has a radius of curvature of 35 at the center.
mm, and the peripheral portion was finished by grinding after casting and molding so as to have a smooth curve of about 25 mm. On the other hand, the upper surface of the side view was finished by grinding after molding so that the curved surface had a radius of curvature of about 40 mm. The swing angle θ was about 27 degrees.

With respect to the magnet holder 17, the holding force was examined by the test methods 1 and 2. As a result, as shown in Table 1, it was found that all test results have sufficient holding power. Further, it has been found that, despite having such a strong holding force, it is easy to swing on the posted object with an extremely small force and is easy to remove. Further, it was found that by pushing the upper end in a state where the magnet holder is attracted to the object to be posted, the object to be posted can be extremely easily inserted and removed. Even when it was turned over, like the first embodiment, it was easy to remove.

(Comparative Example 1) Using the same rectangular parallelepiped Nd-based sintered rare earth magnet used as the raw material of Examples 1 and 2, the holding force was examined in that state. As shown in Table 1, the results show that in Test Method 1, the results were obtained in Example 1 or 2
Although the holding power was slightly smaller, the test method 2 slightly exceeded the results of Examples 1 and 2. However, it could not be removed with bare hands when attached to the whiteboard. In order to remove it, it is necessary to remove it with a tool such as pliers, which is extremely inconvenient.

(Comparative Example 2) (See FIG. 9) The Nd-based sintered rare earth magnet 29 is used as the circular plastic main body 5
Using the magnet holder 50 (commercially available product, made by KOKUYO, product name “color magnet”) shown in FIG. 9 fixed with an adhesive in a cavity opened at an eccentric position on one side of 0a, in test methods 1 and 2. The test was conducted. The outer diameter of the body is 30
mm, thickness is 6.2 mm. As a result of taking out the rare earth magnet 29 and measuring the dimensions, the diameter is 10 mm and the thickness is 2.1 m.
It was m. As shown in Table 1, the test result of the holding force shows that the magnet holder in Test Method 1 has a holding force smaller than that of the magnet holders 11 to 17 of the present invention, but has a sufficiently practical holding force. However, it has been found that the method of use is limited in spite of using the Nd-based sintered magnet, which exhibits a strong holding force and has a high bending strength in Test Method 2. Further, during repeated use, the magnet came off from the main body due to peeling of the plating, and the magnet was often unusable.

[0070]

As described above, the magnet holder of the present invention has an extremely large magnetic attraction force, but can be easily removed from the object. The front side of the magnet holder also has a magnetic attraction force. Therefore, even a sheet of paper that is fastened by a general-purpose fastener such as a binder clip can be fixed with a sufficient holding force by adsorbing these magnetic portions on the upper surface of the magnet holder. Moreover, the magnetic attraction force works just by bringing them close to each other, and it can be fixed very easily. Furthermore, the paper can be easily removed by pulling it. Also, by swinging the magnet holder, it is possible to attach and detach the posted matter, and the usability becomes extremely good.

Furthermore, in order to make effective use of Nd-based magnet scraps that are generated in large quantities in the Nd-based magnet production process or from used home appliances and electronics-related equipment, and to enable reuse and recycling, it is possible to protect the global environment. The cost can be reduced even though the load is reduced and the precious and expensive Nd-based magnet is used.

[0072]

[Brief description of drawings]

FIG. 1 is a diagram showing a magnet holder according to a first embodiment of a magnet holder of the present invention by a third angle method.

FIG. 2 is a diagram showing a magnet holder according to a second embodiment by a third angle method.

FIG. 3 is a diagram showing a magnet holder according to a third embodiment by a third angle method.

FIG. 4 is a diagram showing a magnet holder according to a fourth embodiment of the present invention by a third angle method.

FIG. 5 is a diagram showing a magnet holder according to a fourth embodiment by a third angle method.

FIG. 6 is a diagram showing a magnet holder according to a sixth embodiment of the present invention by a third angle method.

FIG. 7 is a diagram showing a magnet holder according to a fifth embodiment by a third angle method.

FIG. 8 is a schematic diagram showing a method of cutting out a magnet used in the magnet holder of the present invention from a VCM.

FIG. 9 is a diagram showing an example of a commercial product of a magnet holder using the Nd-based rare earth magnet shown in Comparative Example 2 by the trigonometric method.

FIG. 10 is a diagram showing a magnet holder according to a prior art in an oblique projection method.

[Explanation of symbols]

11, 12, 13, 14, 15, 16, 17: Magnet holders 21, 22, 23, 24, 25, 26, 27, 29: Rare earth magnets 31, 32, 33, 34, 35, 36, 37: Yoke 40 : VCM magnet, 50, 51, 52, 53, 54: Magnet holder

Claims (10)

[Claims] 1. The main body is made of a non-magnetic material, and the magnetic attraction surface is a convex curved surface or both sides of which are convex curved surfaces with a part of the central portion being a flat surface, and the surface opposite to the magnetic attraction surface. Is formed with a concave curved surface, and the rare earth magnet is embedded in the main body so that its magnetic pole surface is almost the same as or slightly recessed from both surfaces of the main body through a yoke made of a soft magnetic material. A magnet holder that is characterized by 2. The shape of the main body in the drawing drawn by the trigonometric method in a state where the main body is made of a non-magnetic material and is placed on a horizontal plane with the magnetic attraction surface facing downward,
(A) The lower side forms a smooth curve that is convex downward, and the upper surface is a curved line that is concave upward, or (ii) a part of the lower central part is a straight line that touches the horizontal line, and its width is Width of the body 1
Less than / 3, and the left and right sides of the curve are formed as convex curves downward, the upper surface is a concave curve upward, and in the side view, (b) the lower contour line is a straight line tangent to the horizontal line, and ( C) The rare earth magnet is located in the center of the side view, and it is embedded so that its magnetic pole surface is either directly or through a yoke made of soft magnetic material and is in the same position as or slightly recessed from both surfaces of the main body. A magnet holder featuring. 3. The plan view is a circle, an ellipse, or a hexagon or an octagon that is mirror-symmetrical with respect to a vertical center line and has a mirror-symmetrical center line orthogonal thereto. And a magnet holder as defined in claim 2. 4. A rectangular parallelepiped rare earth magnet manufactured and magnetized so that the rare earth magnet is magnetically oriented in the thickness direction, and embedded in the magnet holder body such that its longitudinal direction is the left-right direction in the side view. The magnet holder according to any one of claims 1 to 3, wherein the magnet holder is provided. 5. The rare earth magnet is an arc segment shaped rare earth magnet manufactured so that the magnetic field is oriented in the thickness direction, and the curved surface of the rare earth magnet is embedded in the main body in a direction corresponding to the curved surface of the main body of the magnet. The magnet holder according to any one of claims 1 to 3, wherein: 6. A yoke made of a soft magnetic material is arranged on one side of the rare earth magnet, and (a) in the front view, the horizontal dimension of the yoke is smaller than the horizontal dimension of the rare earth magnet, and in the side view, the left and right sides of the yoke. The dimension in the direction is larger than the dimension in the left-right direction of the rare-earth magnet, or (a) the dimension in the left-right direction of the yoke is larger than the dimension in the left-right direction of the rare-earth magnet in the front view, and the dimension in the left-right direction of the yoke is larger in the side view. The size is smaller than the size of the rare earth magnet in the left-right direction, and (b) the outer side of the yoke is embedded in the main body so as to be substantially flush with the surface of the main body of the magnet holder. The magnet holder according to any one of items. 7. A yoke made of a soft magnetic material is arranged on both sides of the rare earth magnet, and the yoke is embedded in the main body so that the outside of the yoke is substantially flush with the surface of the main body of the magnet holder. The magnet holder according to any one of claims 1 to 5. 8. A rare earth magnet magnetized in the thickness direction is sandwiched by two yokes made of a soft magnetic material so that the magnetizing direction coincides with the lateral direction in the side view, and The magnet holder according to any one of claims 1 to 3, wherein the end surface is exposed on substantially the same surface as both surfaces of the magnet holder body. 9. The Nd-based sintered magnet is used as the rare earth magnet, according to any one of claims 1 to 8.
The magnet holder described in paragraph. 10. The magnet holder according to claim 9, wherein, as the Nd-based sintered magnet, a magnet taken out from a used device or scrap generated in a manufacturing process of the magnet is used.