JP2003115406A - Magnetic shielding spacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic shielding spacer which is thin and comparatively lightweight, capable of weakening the influence of lines of magnetic forces generated by adjacent magnets on one another, and easily separates the magnets into pieces. SOLUTION: This spacer is equipped with a yoke plate 1 which is large enough in surface area to cover the one side of the magnetic pole surface of a magnet and a synthetic resin spacer main body 2 which covers all the surface of the yoke plate and whose top surface 2a serves as a mounting surface for the magnet. A line of magnetic force which originates from the magnetic pole of the undersurface of the magnet penetrates through the yoke plate, so that magnetism extending downward below the spacer main part 2 is shielded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a spacer interposed between magnets having a strong magnetic force when they are transported or stored.

[0002]

2. Description of the Related Art Magnets having a high magnetic flux density, such as rare earth magnets such as neodymium magnets and samarium magnets, are strongly bonded once they are magnetically attached to each other, and it is difficult to pull them apart. Therefore, at the time of transportation or storage, a spacer S made of a non-magnetic material is interposed between the adjacent magnets M as shown in FIG. At present, the commonly used spacer S is a small block made of cork or wood fiber.

[0003]

Since the cork and the small block are light in weight for their thickness, they do not increase the weight burden during transportation. However, it is necessary to have a certain thickness because it is used to weaken the influence of the lines of magnetic force between the magnets. As a result, the bulk is increased, and the transportation efficiency and the storage efficiency are extremely deteriorated. Moreover, once used, it is bulky to return, so it is discarded as is,
It becomes useless garbage.

It is an object of the present invention to provide a magnetic shield spacer which is thin and relatively lightweight, but which weakens the influence of magnetic lines of force between adjacent magnets and facilitates individual separation of the magnets.

[0005]

The present invention has the following structure in order to achieve the above-mentioned object. That is, the spacer includes a yoke plate having a surface area sufficient to cover one surface of the magnetic pole surface of the magnet, and a spacer main body portion made of synthetic resin that covers the entire surface of the yoke plate and has an upper surface that is the mounting surface of the magnet. It is equipped with features.

The specific material of the synthetic resin constituting the spacer main body is not particularly limited, and a general-purpose polymer resin material or the like can be adopted, but a hard material is preferable to a soft one. The spacer body covers the surface of the yoke plate as long as the yoke plate does not impair the function of the yoke. It has a disk shape, and the yoke plate is embedded therein. The yoke plate is a plate material made of a material having a large relative magnetic permeability such as an iron material, and functions as a yoke for the magnet and exhibits a magnetic shield effect.

The spacer body is preferably provided with a rising edge at the peripheral edge of the upper surface in order to prevent the placed magnet from being displaced. It is desirable that the rising edge has a taper surface on the inner peripheral surface toward the outside so that the magnet can be taken out easily. Further, the spacer body and the yoke plate may be provided with holes penetrating from the lower surface to the upper surface at corresponding positions. This hole is for attaching a mark representing the magnetic pole of the magnet to the lower surface of the magnet.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the illustrated embodiments. FIG. 1 is a plan view of a spacer according to an embodiment of the present invention, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is an explanatory view showing its usage state.

In the figure, reference numeral 1 is a yoke plate, which is made of an iron material having a large relative magnetic permeability and is formed into a substantially circular plane shape slightly larger than one surface of the magnetic pole surface of the magnet. Reference numeral 2 denotes a synthetic resin spacer main body that covers the entire surface of the yoke plate 1. The upper surface 2a of the spacer body 2 serves as a mounting surface for the magnet. A rising edge portion 3 is integrally formed on the peripheral edge portion of the spacer body portion 2. Inner peripheral surface 3a of rising edge 3
Are formed as outwardly tapered surfaces. Four
Is a through hole penetrating the yoke plate 1 and the spacer body 2.

The usage state will be described. The magnet M is placed on the upper surface 2 a of the spacer body 2. The lower surface of the magnet M is magnetically attached to the yoke plate 1. Magnetically bonded yoke plate 1
Serves as a passage for magnetic force lines generated between the magnetic poles below the magnet and the magnetic poles above the magnet, and suppresses or prevents the magnetic force lines from penetrating below the magnet.

FIG. 4 is a schematic diagram of the principle. Figure 4
(A) shows the state of magnetic force lines in the case of a spacer which is not embedded with the yoke plate 1 and is made of only the spacer main body 10 made of synthetic resin. The magnetic lines of force penetrate through the spacer body 10 and reach the space below the spacer body 10,
There is almost no shield effect. On the other hand, in the case of the spacer according to the present invention in FIG. 4B, the magnetic field lines from the magnetic pole N below the magnet pass through the yoke plate 1 toward the magnetic pole S above the magnet. For this reason, the magnetic field lines radiated in the space below the spacer body are considerably reduced and magnetically shielded. When stacked in a plurality of stages (see FIG. 3), the magnetic field lines to the upper magnetic pole of the middle magnet M2 will pass through the yoke plate 1 provided in the spacer body of the upper magnet M1, and the magnets M1 and M2. And will not be strongly magnetized. As a result, this spacer becomes a thin and lightweight magnetic shield spacer.

A magnet M mounted on the upper surface of the spacer body.
Since it is surrounded by the rising edge 3, it does not come off from the spacer body upper surface 2 due to vibration or the like. Although the yoke plate 1 of the spacer interposed between the lower magnet M2 and the upper magnet M1 is magnetically attached to the upper and lower magnets M1 and M2, the spacer main body part on which the upper magnet M1 is placed In No. 2, since the bottom surface of the spacer main body has a smooth surface made of a synthetic resin material, it can be easily separated from the lower magnet M2 by laterally shifting it along the upper surface of the lower magnet M2. Since the inner surface 3a of the rising edge 3 of the magnet M placed on the upper surface 2a of the spacer main body 2 is an outwardly tapered surface, it is relatively easy to move from the upper surface 2a of the spacer main body 2a by moving it along the inner surface 3a. You can leave.

By placing each magnet M on the upper surface 2a of the spacer body and stacking them, a large number of magnets M become a series of continuous blocks. The magnets M integrated with the spacer repel when they are stacked unless their magnetic poles are in the same direction. In other words, stacked magnets M
The magnetic poles have the same direction. Therefore, by marking the lower surface of the magnet M from the hole 4 provided in the spacer through a marker or the like, it is possible to confirm which of the magnetic poles of the magnet M is removed from the spacer by this mark. Become.

FIG. 5 shows different usage states of the spacer according to the above embodiment. Here, the stacked magnets M1 to M3 do not have a common spacer as in the above-described embodiment, but are protected by spacers (S1 and S2, S3 and S4, S5 and S6) having different magnetic pole surfaces. (The structure of the spacer itself is the same as that of the above-described embodiment, and the same members are designated by the same reference numerals, and the description thereof will be omitted). That is, the magnet M1 is in a state where the upper and lower magnetic pole surfaces are sandwiched by the spacers S1 and S2. Similarly, the magnet M2 is sandwiched by the spacers S3 and S4, and the magnet M3 is sandwiched by the spacers S5 and S6. is there. Each of the magnets M1 to M3 is individually sandwiched by two spacers to form a circuit of magnetic force lines as shown in FIG. 6B. In the case of the above-mentioned embodiment, the single yoke plate provided on the spacer between the upper and lower magnets serves as a common passage for the magnetic force lines emitted from the different magnetic pole surfaces of both magnets, whereas in this embodiment, The magnetic field lines emitted from the respective magnetic pole faces of the magnet pass through the yoke plates of the respective unique spacers. As a result, a further magnetic shielding effect can be expected. The magnets are attracted to each other because the surfaces of the two spacers come into contact with each other and are attracted by the lines of magnetic force that slightly leak to the outside of the unique spacers, so that they are integrated with each other by an appropriate magnetic force. Moreover, since the surfaces of the spacers are in close contact with each other, the smoothness of the materials of the spacer body can be used to separate the spacers more reasonably. Note that FIG. 6A shows a case where the yoke plate is not provided in the spacer body made of synthetic resin. The behavior of the magnetic force lines in this case can hardly exert the magnetic force line shielding effect, as in the case shown in FIG. 4 (B).

The outer shape of the yoke plate and the spacer body of the present invention can be selected according to the shape of the magnet. Further, the design of the thickness and size of the yoke plate and the spacer body can be changed according to the magnetic flux density of the magnet. Furthermore, the usage state of the spacer of the present invention is not limited to that shown in FIGS.

[0016]

According to the present invention, the following effects can be obtained. Since the entire surface of the yoke plate having a surface area sufficient to cover one surface of the magnetic pole surface of the magnet is covered with the spacer main body made of synthetic resin, the magnetic force lines from the magnet placed on the upper surface of the spacer main body are not covered by the yoke plate. As a result, the magnets can be reliably shielded from the space below the spacer body while being thin and relatively lightweight, and adjacent magnets can be easily and safely separated via the spacers.

Since the magnetic pole surface of the magnet is not directly in contact with the yoke plate to be magnetically attached, but is magnetically attached via the spacer member made of synthetic resin, the magnetic pole surface of the magnet is not damaged, and moreover the synthetic resin material is used. Due to the surface smoothness, the separation can be smoothly performed only by shifting the magnet. Since it is thin and not bulky, it can be efficiently collected and reused.

[Brief description of drawings]

FIG. 1 is an external perspective view of a spacer according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the spacer shown in FIG.

FIG. 3 is an explanatory view showing a usage state.

FIG. 4A is an explanatory diagram showing a distribution state of magnetic force lines in a use state of a spacer including only a spacer main body portion having no yoke plate. FIG. 6B is an explanatory view showing a distribution state of magnetic force lines in a usage state of the spacer according to the present invention.

FIG. 5 is an explanatory diagram showing different usage states of the present invention.

FIG. 6A is an explanatory view showing a distribution state of magnetic force lines in a use state of a spacer including only a spacer main body portion having no yoke plate. FIG. 6B is an explanatory diagram showing a distribution state of magnetic force lines in the use state of FIG. 5.

FIG. 7 is an explanatory view showing an example of a conventional spacer.

[Explanation of symbols]

1 York plate 2 Spacer body 3 rising edge 4 holes M, M1 to M3 magnets S1 to S6 spacer

Claims (5)

[Claims] 1. A yoke plate having a surface area sufficient to cover one surface of a magnetic pole surface of a magnet, and a spacer main body made of synthetic resin which covers the entire surface of the yoke plate and whose upper surface constitutes a mounting surface of the magnet. A magnetic shielding spacer characterized by the following. 2. The magnetic shield spacer according to claim 1, wherein the spacer main body has a rising edge at a peripheral edge of an upper surface. 3. The magnetic shield spacer according to claim 2, wherein an inner peripheral surface of the rising edge portion is a tapered surface directed outward. 4. The spacer body and the yoke plate are
The magnetic shielding spacer according to claim 1, further comprising a hole portion penetrating from one surface to the other surface. 5. The magnetic shield spacer according to claim 1, 2 or 4, wherein the spacer body has a disk shape, and the yoke plate is embedded therein.