JP4932817B2 - Magnet products - Google Patents

Description

  The present invention is a magnet product used in various applications such as daily goods and electrical device parts.

Magnets are widely used in various fields of daily life. For example, as daily miscellaneous goods, fasteners for attaching a memo to a board made of a magnetic material such as steel are well known. This fastener is usually called a color magnet, and a magnet body magnetized with a predetermined metal or sintered alloy is fixed to the back of a resin holder having a circular shape or a heart shape, or is formed into a circular shape or a heart shape. The entire magnet body is coated with resin paints or coatings of various colors. Some also have magnet bars that use sheet magnets.

In addition, horseshoe-shaped magnets, bar magnets, or flat circular magnets are used for children's educational materials. Furthermore, it is also used as a constituent member of a detection sensor for an opening / closing part such as an anti-theft window or door.

As for color magnets, a magnet holder fixed to a resin holder is not only used on one side, but also because the magnetic pole surface of the magnet body exposed on the back is directly magnetized on the board. This may damage the board surface.

When the entire surface of the magnet body is covered with a resin coating such as paint or nylon, both surfaces can be used, and the board surface is not easily damaged, but the overall shape represents the shape of the magnet body as it is. If the magnet body is formed into a square, triangle, trapezoid or star shape with corners, the corners are easily damaged, resulting in poor yield in the manufacturing or transportation process. It is easy to be limited to the shape. In addition, if air or moisture enters during the formation of the film, bubbles are generated and become fluffy, making it difficult to produce a product.

Since the magnet bar is made by kneading magnetized powder inside the rubber material, the magnetic force is weak and the whole becomes black or brown.

Many teaching material magnets display only on the magnetic pole portion without covering the entire magnet body with paint or the like in order to recognize the material. If dropped, it will break easily, and if the magnets collide with each other, the surface will be chipped.

Furthermore, since the magnet used as the detection sensor for the opening / closing part is also fixed to the casing with the magnetic pole exposed, it is vulnerable to vibration, and rainwater, dust, and the like adhere to the magnetic pole surface and are liable to malfunction. Also, neodymium magnets or the like may rust.

The object of the present invention is devised to solve the above-mentioned problems, and there is no risk of damaging the magnetized surface such as the board surface, and it can be formed in any external shape and color, and can be manufactured, transported or used. It is an object of the present invention to provide a magnet product that is unlikely to cause breakage or breakage of the magnet body in the process, has moderate buffering properties, prevents rusting, and is less likely to malfunction when used in sensors.

In order to solve the above problems, the present invention adopts the following configuration. That is, the invention according to claim 1 includes a single or a plurality of permanent magnets , a back plate made of a magnetic material that is attached to one magnetic pole surface of the single or a plurality of permanent magnets and serves as a yoke, and the single or a plurality of permanent magnets. silicone rubber shell covering the said plurality of permanent magnets back plate, wherein a silicone rubber outer shell which is formed in the screw hole, the silicone rubber of the outer shell, prior Kitan number or more the a permanent magnet and the back plate, coated on their entire surface, or leaving a portion of the surface of the back plate, coated on their surface, the pole face of said one or more permanent magnets body with thinner than the thickness of the other portions shell the thickness of the pole surface shell that covers covering the surfaces other than the magnetic pole surface, thereby bulging the other partial shell in the plane direction of the magnetic pole surface By the, by forming a whole magnet of any shape.

According to a second aspect of the present invention, there is provided one or more permanent magnets, an outer shell made of silicone rubber that covers the entire surface of the one or more permanent magnets, and a screw hole formed in the outer shell of the silicone rubber. A thickness of a magnetic pole face outer shell that covers the magnetic pole face of the one or more permanent magnet bodies is made thinner than a thickness of an outer shell that covers a surface other than the magnetic pole face, and the other partial outer shell is By bulging in the plane direction of the magnetic pole surface, the entire magnet is formed into an arbitrary shape.
According to a third aspect of the present invention, the silicone rubber outer shell relieves an impact force from the outside of the magnet product . Et al is, the invention of claim 4, wherein, in any of the magnet products described above, a plurality of the permanent magnets, the arrangement of the magnetic poles in the magnetically attached surfaces of the permanent magnets is as is more poles.

The outer shape of the magnet body enclosed in the outer shell is not specified. A rod-shaped or square-shaped one may be used, but the most common shape such as a circular or rectangular flat plate that is easy to manufacture and does not cost is adopted.

Since the entire surface of the magnet body is covered with a silicone rubber outer shell in a specific manner, the residual magnetic flux density (Br) is higher than that of a general ferrite magnet, the residual magnetic flux density (Br) is 350 (mT) or more, and the coercive force ( bHc) is preferably 200 (KA / m) or more and the maximum energy product (BHmax) is 24 (KJ / m ³ ) or more.
The thickness of the silicone rubber outer shell covering the magnetic pole surface is set to a suitable thickness according to the magnetic force and application of the magnet body, but is about 0.5 to 1.0 mm thick in order to exhibit buffering properties and friction properties. desirable. The silicone rubber outer shell with this thickness reduces the magnetic permeability of the magnet body to about 70 to 80% of its original magnetic force, so use a magnet body with the above-mentioned magnetic field line characteristics. In order to secure a certain magnetic adhesion force.

The product magnet according to claim 1 or 2 has various planar outer shapes such as triangles and stars by bulging the other part outer shell covering the surface of the magnet body other than the magnetic pole surface in the plane direction of the magnetic pole surface. , It can be formed into a shape having an acute angle portion. Of course, it is also possible to form a shape having no acute angle, such as a flat circular shape or a heart shape. Further, a magnet body having a surface parallel to a surface other than the magnetic pole surface and having a thickness larger than that of the magnetic pole surface outer shell can be adopted.

This magnet product can be used for various applications such as a memo-stopping magnet or a magnet used in a sensor unit of an anti-theft device. In the case of what is used for a sensor part, it is desirable that the magnet body is covered with an outer shell so as to be airtight.
Moreover, this magnet product can also print on the surface of the silicone rubber colored suitably.

Furthermore, in the invention described in claim 3, for example, a hook member for hooking an object can be used as the hook fixed to the plate member, and a paper clip or the like can be used as the stopper.

The invention according to claim 4 can be used as, for example, a constituent member of various electric devices. In this case, a part of the outer shell covering the surface of the magnet main body protrudes outward to form an attachment portion for equipment. The mounting portion adopts various structures depending on the form of the mounted portion. For example, it is configured as an attachment body having a screw-fastening hole, or an attachment body having a protrusion or a recess that can be fitted to the attachment portion, or an attachment piece that can be attached to the attachment portion via an adhesive layer.

When this magnet product is fixed to the yoke, the surface of the magnetic pole face outer shell is set to protrude outward from the end of the yoke. At this time, the magnet body embedded in the silicone rubber outer shell It does not matter whether the magnetic pole surface protrudes beyond the end of the yoke.

According to the present invention, the entire surface of the magnet body is covered with the outer shell made of silicone rubber, and the other outer shell covering the surface other than the magnetic pole surface is bulged in the plane direction of the magnetic pole surface. While the magnetizing force is not hindered by the bulging portion, it is possible to prevent the magnet body from being damaged or broken due to an impact.

Further, in the product of the present invention, since the magnetic pole surface is covered with the outer shell made of silicone rubber, there is no possibility of causing damage due to rubbing on the magnetically adhered surface. Rather, the surface friction resistance of the silicone rubber material can prevent the magnet from moving in the sliding direction, which is considered to be relatively weak. The slip prevention effect is more effective when the magnet product is used while being fixed to the back surface of the holder.

In particular, the invention according to claim 1 can be used on both sides.
According to the second aspect of the present invention, since the portion corresponding to the yoke is provided on the outer periphery, it has a strong magnetic adhesion force despite having the magnetic pole surface outer shell.
In the case of the invention described in claim 3, the object can be used by hooking an object on the hook or holding paper or the like between the hook.
Further, in the case of the invention according to claim 4, the magnet body can be fixed to various devices and instruments without any other member without difficulty, and the impact force at the time of adsorption can be mitigated by an appropriate buffer property, and the rust of the magnet body can be reduced. Occurrence can be prevented.

Silicone rubber can be colored in any color and can be printed with letters and graphics, so that it can provide a magnet product with a colorful and varied outer shell.
In addition, the outer shell made of silicone rubber that covers the part other than the magnetic pole surface can be combined with curves or straight lines, or can be formed to project at an acute angle, making it easy to produce magnet products with various outer shapes. Can be manufactured. The other outer shell made of silicone rubber that bulges in the plane direction of the magnetic pole face has an appropriate buffering force, and thus can protect the internal magnet body as described above.

As the magnet body, a general circular or rectangular shape can be used, and the silicone outer shell can be molded with the magnet body enclosed therein, so that the manufacturing cost can be kept relatively low.

In addition, according to the present invention, when used in sensors, the magnetic pole surface is protected by silicone rubber, reduces the impact force at the time of opening and closing of the door and the like, exhibits a waterproof function, is hardly damaged, In addition, it is possible to provide a device that is less prone to malfunction.

Furthermore, according to the present invention, when it is provided as a product for teaching materials such as a child, it is possible to provide a product that is relatively safe and hardly broken or broken even if dropped or thrown.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.
Reference numeral 1 in the figure denotes a memo-stopping color magnet, which covers the entire surface of a disc-shaped rare earth magnet body 2 with an outer shell 3 made of silicone rubber.
The magnet main body 2 forms a magnetic pole surface in which the upper surface and the lower surface in the figure are magnetized to an N pole and an S pole. Magnet body 2 has magnetic field line characteristics with a residual magnetic flux density (Br) of 350 (mT) or more, a coercive force (bHc) of 200 (KA / m) or more, and a maximum energy product (BHmax) of 24 (KJ / m ³ ) or more. Is provided.

The silicone rubber outer shell 3 does not cover the magnet body 2 uniformly, but the thickness of the portion covering the magnetic pole surface (the magnetic pole surface outer shell 4) is the portion covering the surface other than the magnetic pole surface and the peripheral surface of the magnet main body. It is thinner than (other part outer shell 5).
The magnetic pole surface outer shell 4 is formed to have a thickness of, for example, about 0.7 mm, and suppresses the reduction of the magnetizing force as much as possible while maintaining the cushioning property as silicone rubber.

The other partial outer shell 5 bulges in the plane direction of the magnetic pole surface and forms a star shape in plan view. The star-shaped tip portion protrudes in an acute angle shape, and this acute angle portion is soft in contact with the properties of the silicone rubber and has an impact absorbing ability.

As shown in FIG. 2, the magnet product 1 is easily manufactured by filling silicone rubber 7 in the molds 6 and 6 that accommodate the magnet body 2. For example, silicone rubber manufactured by Shin-Etsu Chemical Co., Ltd. is used.
The method of use is the same as that of a conventional color magnet. The magnetic pole surface is magnetically attached to the board, and a memo is inserted between the board and the magnetic pole surface. Since the magnetic pole surface outer shell 5 of the contact surface with the board is made of a silicone rubber material, it is difficult to slip and securely attaches the memo on the board. Since the outer shell 3 has a moderate shock-absorbing force, it does not chip or crack even if it collides with each other during product transportation, and also reduces the impact force on the internal magnet body 2 even if it is dropped during use. To do.

The magnet product can be formed into any specific shape such as a polygonal shape, a heart shape, an arrow shape, or an elliptical shape by variously changing the shape of the outer shell of the other portion. The number of magnet main bodies accommodated in the outer shell is not limited to a single number, and may be plural. Further, the storage position of the magnet body in the outer shell does not need to be the center position of the outer shell. For example, in the case of a magnet product 11 in which the outer shell has an arrow shape, as shown in FIG. You may make it locate in the twist shape part 15a (FIG. 3a) of the shell 15, or the linear part 15b (FIG. 3b) connected to the twist shape part 15a.

4 and 5 show another embodiment of the present invention.
In this magnet product 21, a rectangular magnet (magnet product) 1 according to the above embodiment in which a magnet body is covered with an outer shell made of silicone rubber is housed and fixed in a yoke 26. The yoke 26 is formed by bending a steel plate material into a substantially U-shaped cross section including a bottom wall portion 26a and both side wall portions 26b and 26b. The upper ends of the side wall portions 26b in the figure are at positions lower than the surface 4a of the magnetic pole face outer shell 4 of the magnet 1, and the surface 4a of the magnetic pole face outer shell 4 is a slight amount (h1) than the upper ends of both side walls of the yoke. It protrudes. Further, the magnet body magnetic pole surface inside the magnetic pole surface outer shell is positioned lower than the upper ends of both side walls 26b by a slight amount (h2).
On the outside of the yoke 26 of the magnet product 21, for example, a synthetic resin clip-type holder or hook 27 is fixed and supports a certain load unlike a color magnet that sandwiches one or two sheets of paper. Used as something to do.

This magnet product 21 obtains a strong magnetizing force because the lines of magnetic force emitted from the magnet body pass through the yoke 26 and the amount of radiation to the external space is reduced. It is desirable that the magnetic pole surface of the magnet body enclosed in the outer shell 3 is equivalent to the upper end of the yoke side wall or slightly lower than this as shown in FIG. 5, but it is not necessarily limited to this.

Since the surface 4a of the magnetic pole surface outer shell 4 protrudes from the upper end of the yoke side wall, the magnet product 11 is not the upper end of the side wall of the yoke with respect to the magnetized surface 7 such as a board. The surface 4a of the outer shell 4 is brought into contact. As a result, a flexible silicone rubber material, not a metal, comes into contact with the board 7, and even if the contact surface rubs the board surface, the board surface is not damaged.

Moreover, since the surface of the magnetic pole surface outer shell 4 has an appropriate frictional force, it moves in the sliding direction (especially, this magnet product is used to support a certain load as described above. Therefore, it is possible to prevent the board 27 from slipping off.

Moreover, this magnet product can be incorporated and used in sensors for anti-theft devices.
In this type of sensor, when an opening / closing part is formed by a window and a window frame, a magnet is arranged on either the window or the window frame, and a change in magnetic field lines from this magnet (change in magnetic flux density) is placed on the other side. It is provided with a detection unit for detecting.
When the window is opened during operation, the magnetic flux density changes when the window is closed, and an alarm means such as a buzzer is activated by a sensor that detects this to notify the intrusion of a thief or the like.

By using this magnet product for this sensor, the magnet body is completely covered with a water-tight silicone rubber outer shell, which is effective not only for rust prevention of the magnet body but also for dust and the like. It is possible to provide an anti-theft device that is difficult to perform and also has a buffering effect against an impact caused by opening and closing of a window, and is unlikely to cause a malfunction for a long time.

6 and 7 are an external perspective view and a cross-sectional view showing a magnet product 31 according to still another embodiment of the present invention.
In this product, a circular plate 37 made of a magnetic material is magnetically attached to one magnetic pole surface of a disc-shaped rare earth magnet main body 32. A sleeve 38 is erected at the center of the outer surface of the circular plate 37, and a female screw is formed in the sleeve. The magnet body 32 and the circular plate 37 are entirely covered with an outer shell 33 made of silicone rubber except for the sleeve 38. The circular plate functions to increase the magnetic force of the magnetic pole face on the opposite side of the magnet plate from the circular plate.
A base end portion of a hook 39 in which a male screw is formed is screwed into the sleeve 38. The hook 39 is used for hooking a relatively lightweight object.

The magnet product according to this embodiment is used by magnetizing the back surface of the product 31 at a desired location and hooking an object on the hook 39 protruding from the surface. Depending on the weight of the object hung on the hook 39, the product 31 has an acting force in a downward sliding direction, but the magnet body 32 of the product 31 is a rare earth magnet having a relatively strong magnetic force, and the outer shell 33 is Since the silicone rubber to be formed has a large surface frictional force, it is possible to latch an object that is heavier than a conventional magnet latch of this type.
Further, since the base end portion of the hook 39 is screwed to the sleeve 38, the hook 39 can be easily replaced with a hook such as another hook having a male screw base end portion that can be screwed with the female screw of the sleeve 38. .

FIG. 8 is an external perspective view of a magnet product 41 according to a different embodiment of the present invention.
In the figure, reference numeral denotes a magnet body of a rare earth magnet having a rectangular parallelepiped shape, and a back plate 47 made of a magnetic material serving as a yoke is attached to one side. The back plate 47 concentrates the magnetic force on the magnet body magnetized surface opposite to the attached surface.
The magnet body 42 is entirely covered with an outer shell 43 made of silicone rubber. In addition to the portion 44 covering the magnet body 42, the outer shell 43 includes a rectangular parallelepiped mounting body 45 whose side portions bulge integrally in the horizontal direction as it is on the back plate side of the magnet body 42. A countersunk screw hole 45a is formed through the mounting body 45 in the vertical direction.

Therefore, the magnet product 41 is placed at a predetermined position of equipment or instruments, and is fixed at the above position by screwing a screw through the countersunk screw hole 45a. The fixed magnet product 41 generates a strong magnetic field on the magnetized surface opposite to the back plate 47 and magnetizes a predetermined member. The shock at the time of magnetic attachment is softened by the buffering property of the outer shell 43, and not only does the impact sound be mitigated but also does not wobble the screw. Further, the magnet main body 42 is covered with the outer shell 43, thereby protecting the magnet main body 42 from moisture and preventing the occurrence of rust.
In the magnet product of FIG. 8, the mounting body 45 has protrusions (not shown) on the front surface and the back surface in addition to the structure having the screw holes 45 a, and the protrusions are formed in grooves provided in the mounting portions. It may be fitted and attached.

In the magnet product 51 of FIG. 9, the attachment body 55 of the outer shell 53 is provided on the left and right of the magnet body 52. Each of the left and right attachment bodies 55 is formed with a countersunk screw hole 55a penetrating in the vertical direction, and is fixed to a predetermined position of equipment or the like by screwing a screw into these screw holes 55a. In this product, the magnetized surface of the magnet body 52 is located on the upper surface in the figure.
Further, in the magnet product 61 of FIG. 10, the mounting portion 65 of the outer shell 63 is formed as a mounting piece that can be mounted on a mounting portion such as equipment via an adhesive layer 65a.
Further, as a series of magnet products provided with an attachment portion, although not shown, there is a modification of the embodiment of FIGS. In this example, the entire part including the sleeve is covered with the outer shell. An outer shell portion covering the sleeve forms an attachment portion. Then, for example, a through hole in the radial direction is provided in the sleeve, and a pin is inserted into the through hole, so that the sleeve is fixed to a predetermined device or the like.

In the present invention, a name, letters, symbols, figures, etc. can be easily printed on the surface of the silicone rubber outer shell by, for example, screen printing. As a result, not only the advertisement display but also various magnet products can be easily identified and used for various purposes.
In addition, the outer surface of the circular plate can be used as a stopper using a magnet by directly or indirectly fixing a stopper such as a paper clip instead of a sleeve or a hook. .
Further, the magnetic poles on the magnetized surface may be arranged such that a plurality of magnetic poles are arranged according to the purpose of use.

The external appearance perspective view of the magnet product which concerns on the form for implementing this invention. FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. 1. The top view in another embodiment. Furthermore, the external appearance perspective view of the magnet product in another embodiment. Sectional drawing in the use condition of the product of FIG. The external appearance perspective view of the magnet product in another embodiment of this invention. Sectional drawing of the magnet product of FIG. The external appearance perspective view of the magnet product in another embodiment of this invention. The external appearance perspective view of the magnet product in different embodiment of this invention. The external appearance perspective view of the magnet product in further different embodiment of this invention.

Explanation of symbols

1, 11, 21, 31, 41, 51, 61 Magnet product 2, 32, 42, 52 Magnet body 3, 13, 23, 33, 43, 53, 63 Silicone rubber outer shells 4, 14, magnetic pole surface outer shells 5 Other part outer shell 26 Yoke 37 Circular plate 38 Sleeve 39 Hook 45, 55, 65 Attachment part

Claims (4)

One or more permanent magnets ;
A back plate made of a magnetic material that is attached to one magnetic pole surface of the one or more permanent magnets and serves as a yoke;
An outer shell made of silicone rubber that covers the one or more permanent magnets and the back plate ;
A screw hole formed in the silicone rubber outer shell ,
The silicone rubber of the outer shell, before and Kitan number or plurality of permanent magnets and the back plate, coated on their entire surface, or leaving a portion of the surface of the back plate, for their surface Coat,
While thinner than said one or more of the thickness of the other portions shell the thickness of the pole surface shell covering the pole face covers the surface other than the pole faces of the permanent magnet body, the pole faces of the other part shell A magnet product in which the entire magnet is formed into an arbitrary shape by bulging in the plane direction. One or more permanent magnets;
An outer shell made of silicone rubber covering the entire surface of the one or more permanent magnets;
A screw hole formed in the silicone rubber outer shell,
The magnetic pole surface outer shell covering the magnetic pole surface of the single or plural permanent magnet bodies is formed thinner than the other partial outer shell covering the surface other than the magnetic pole surface, and the other partial outer shell is formed on the magnetic pole surface. A magnet product in which the entire magnet is formed into an arbitrary shape by bulging in the plane direction. The magnet product according to claim 1 or 2, wherein the silicone rubber outer shell relieves an impact force from the outside of the magnet product. The magnet product according to any one of claims 1 to 3 , wherein the magnet product includes a plurality of the permanent magnets, and the arrangement of the magnetic poles on the magnetized surface of these permanent magnets is a plurality of magnetic poles.