JPH04367209A - Thin-film magnetic composition and its manufacture, magnetic medical treatment apparatus using thick-film magnetic composition - Google Patents

Abstract

PURPOSE:To provide a thick-film magnetic composition wherein the number of processes is small, the cost of investment in equipment can be reduced to a minimum, a change in its shape can be applied at a minimum cost, its change with the passage of time is small and it is suitable for a magnetic medical treatment apparatus and to provide its manufacturing method. CONSTITUTION:A mixed alloy powder by a neodymium-iron-boron alloy or a samarium-cobalt alloy as a ferromagnetic material and a thermoset silicone paint are weighed so as to obtain a prescribed ratio; carbitol in proper quantity is added as a solvent and mixed. Thereby, a magnetic paste is prepared 1. It is printed on a silicone rubber substrate so as to obtain a prescribed shape 2. It is heated and hardened 3; after that, it is covered with a silicone resin as an antioxidizing film 4; in addition, it is heated and hardened 5. In addition, the coated thick-film ferromagnetic material is magnetized 6. A thick-film magnet is manufactured on the silicone rubber substrate. It is used, e.g. as a magnetic medical treatment apparatus.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thick film magnetic composition that can be easily formed into a thick film, a method for producing the same, and a magnetic therapy device using the thick film magnetic composition.

0002

[Prior Art] Conventional bonded magnets (or rubber magnets or plastic magnets) are made by mixing/kneading a ferromagnetic material with a thermoplastic resin such as nylon 12 or a thermosetting resin such as epoxy, and then injection molding or It was shaped by compression molding and then magnetized to form a bonded magnet.

0003

[Problems to be Solved by the Invention] For this reason, conventional bonded magnets are advantageous in producing magnets with complex three-dimensional shapes and high magnetic properties, but they are difficult to produce magnets with simple planar shapes. However, they had to be mixed/kneaded, shaped by injection molding or compression molding, and then magnetized. Therefore, even if the magnet has a simple planar shape, investment in equipment such as expensive molds and molding machines is unavoidable. moreover,
It was necessary to apply an adhesive to each magnet manufactured in this manner at a predetermined position on a desired substrate to adhere the magnets one by one.

[0004] Furthermore, when there is a change in shape, a new mold must be manufactured each time, which poses problems from both a process and cost perspective.

[0005]

[Means for Solving the Problems] The present invention has been made for the purpose of solving the above-mentioned problems, and has the following configuration as a means for solving the above-mentioned problems. That is, a mixing process of mixing a mixed alloy powder of a ferromagnetic material and a thermosetting resin to produce a ferromagnetic material paste, and forming a thick film magnet using the ferromagnetic material paste produced in the mixing process. A first printing step of printing a ferromagnetic material thick film pattern of a desired shape and predetermined thickness on a non-magnetic substrate, and a second printing step of heating and curing the ferromagnetic material thick film pattern printed in the first printing step. a second printing step of printing an antioxidant film so as to cover at least the thick film of the magnetic material after heating and curing in the first heating step; The second step is to heat and harden the ferromagnetic material thick film pattern.
A thick film magnet coated with an antioxidant film is formed on a non-magnetic substrate through the heating step and the magnetization step of magnetizing the thick film of magnetic material in the thickness direction after heating and hardening in the second heating step. do.

[0006] The thick film magnet is then formed to match the treatment area to form a magnetic treatment device.

[0007]

[Function] With the above structure, a thick film magnetic composition can be produced with a small number of steps, with a minimum investment in equipment since the steps are substantially the same as those for pattern printing, and which can be applied to shape changes at a minimum cost. Moreover, since the thick film magnet is coated with an anti-oxidation coating, it is possible to provide a thick film magnet whose magnetic properties do not change over a long period of time, and a magnetic therapy device using the magnet.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

[0009]

FIRST EXAMPLE FIG. 1 is a process diagram showing the manufacturing process of a thick film magnetic composition according to an example of the present invention. Hereinafter, an outline of the manufacturing process of an embodiment of the present invention will be explained with reference to FIG. The following description will be made using an example in which the thick film magnet of this embodiment is formed on a silicone rubber substrate. However, the present invention is not limited to the case where it is formed on this silicone rubber substrate, and it goes without saying that it can be formed on a substrate made of any material.

First, in step 1, a ferromagnetic material powder, for example, having an average particle size of 2 having the basic composition of (SmCo5) is prepared.
The samarium-cobalt alloy powder of 0 μm to 30 μm and the thermosetting silicone paint are 81 wt% and 19 wt%.
Weigh it out and add an appropriate amount of carbitol as a solvent to it. Then, mix this thoroughly using, for example, a three-roll roll to make a magnetic paste.

[0011] This ferromagnetic material powder is not limited to the above example; for example, the basic composition is (Nd2
A neodymium/iron/boron alloy powder having an average particle size of 15 μm to 30 μm (Fe14B) and a thermosetting silicone paint may be weighed so that the amounts are 85 wt% and 15 wt%. Next, in step 2, the magnetic paste made in step 1 is used to print a thick film magnetic paste pattern with a desired shape and thickness. This printing process can use the same printing equipment as used for printing conductor patterns of electric circuits, etc., and can be performed using the same method. For example, printing can be performed using various printing methods such as silk screen printing, flexographic printing, letterpress printing, and gravure printing. This printing shape can also be any shape, and even if you print just one pattern on the board, multiple patterns of the same shape, or multiple patterns of different shapes, all will be the same. It's only a process.

Next, in step 3, the silicone rubber substrate printed with the thick film magnetic paste is heated in an atmosphere of 180°C for about 30 minutes.
Heat for a minute to perform magnetic thermosetting treatment. An example of a thick film magnetic composition heat-cured in this manner is shown in FIG. Figure 2
In this example, a substantially circular thick film magnetic composition was formed on a substrate, and after curing, the composition was formed to have a diameter of 5 mm and a film thickness of 0.67 mm.

The thick film of ferromagnetic material that has been thermoset in this manner is a material that is easily oxidized. In particular, samarium is easily oxidized. In particular, when a thick film of ferromagnetic material is magnetized and applied to a magnetic therapy device, it is brought into close contact with the skin, which may cause problems such as rust due to oxidation adhering to the skin. Depending on your constitution, you may be allergic to metals. In addition, the composition changes due to oxidation,
Magnetic properties will deteriorate. Therefore, in order to eliminate this problem, in the subsequent step 4, in order to prevent oxidation (rust) of the magnetic alloy, a silicon resin, which is harmless to the human body, for example, is used as a vehicle, and a printing method similar to that in step 2 is used to thicken the magnetic alloy. Print a pattern slightly larger than the film forming area to completely cover at least the thick film forming area. The coating material used is the same silicone resin as the silicone paint, which is the vehicle for the ferromagnetic material, because it is harmless to the human body, has excellent stability, and increases mutual adhesion. It's for a reason.

[0014] Then, in step 5, the silicone resin is heated in the same manner as in step 3 to thermally harden the silicone resin. The cured state of this coating silicone resin is shown in FIGS. 3 and 4. Figure 3 is a perspective view, Figure 4
is a cross-sectional view, in which 1 is a ferromagnetic thick film, 2 is a non-magnetic silicone rubber substrate, and 3 is a silicone resin film. Finally, in step 6, the thick film magnetic composition is magnetized using a magnetizer to form a magnet. For example, as shown in Figure 5, the N pole is on the bottom surface and the S pole is on the top surface.
In the magnetizing machine where poles are formed and magnetic lines of force pass through in the thickness direction,
The silicone rubber substrate on which the thick film magnetic composition was formed was placed and magnetized at 15,000 oersteds, and the magnetic effect element (
magnet). Note that this magnetization direction is not limited to the above-described magnetization in the thickness direction, but it goes without saying that the magnetization direction may be magnetized in the plane direction of the magnetic effect element. moreover,
Magnetization in other directions may also be used.

The thick film magnet of this example manufactured as described above had a surface magnetic flux of approximately 200 Gauss as measured with a Gauss meter. As explained above, according to this embodiment, since the ferromagnetic material and the thermosetting resin are made into a paste, a predetermined shape can be formed on the substrate by a printing method. Therefore, the shape can be arbitrary, and any changes in shape can be easily accommodated. The ferromagnetic thick film formed in this way was coated with silicone resin, which is harmless to the human body.
Oxidation due to aging can be completely prevented, the alloy composition can be stabilized for a long period of time, and the initial magnetic properties can be maintained for a long period of time.

Furthermore, the surface magnetic flux can be adjusted by adjusting the amount of thermosetting resin to be mixed and the strength of the magnetic field during magnetization, making it possible to provide thick-film shaped magnets of all specifications. Therefore, it can be applied to all kinds of uses, and is particularly suitable for applications such as magnetic therapy devices and sensors. Note that the structure of the magnetic paste for forming the thick film is not limited to the above example, and may be formed from powder of the same ferromagnetic material and thermosetting resin. For example, as a ferromagnetic material powder, Nd-Fe-B
Similar hardening can be achieved using ferromagnetic material powders.

[0017] Furthermore, the reason why a thermosetting silicone paint is used as the thermosetting resin is mainly because the substrate material is silicone rubber. When printing magnetic paste on a substrate, epoxy resin may be used to increase the adhesive strength to the substrate. Even when these substrates were used, the same effects as described above were obtained with the epoxy resin.

The shape of the printed pattern of the magnetic paste can be any shape, for example, square, rectangle, circle, ellipse, diamond, trapezoid, triangle, etc. It is also extremely easy to form a polygonal shape that includes the following. Furthermore, the shape of the thick film is not limited to being approximately uniform or having approximately the same thickness; it may also be a chevron shape with a thicker central portion or a thicker peripheral portion. Of course.

As explained above, the thick film magnets manufactured by the above process are extremely resistant to changes over time, and can be easily formed in the desired number and in the desired shape at the desired position on the substrate 2. Moreover, the surface is coated with silicone resin that is harmless to the human body. Therefore, even if it is brought into close contact with the skin of the human body, it will not cause metal allergies, and by applying it to a magnetic therapy device, it can be made into a very inexpensive and highly stable magnetic therapy device.

Furthermore, by forming a plurality of magnets and arranging the magnets at positions corresponding to acupuncture points on the human body, a magnetic therapy device with high therapeutic effects can be provided.

[0021]

As explained above, according to the present invention, a ferromagnetic material and a thermosetting resin are made into a paste and formed on a substrate by a printing method, and this is further coated with a harmless coating material. It is possible to provide a thick-film magnet that can be easily adapted to arbitrary and arbitrary changes in shape, etc., has almost no change over time, and can maintain its initial characteristics for a long period of time.

In this case as well, the surface magnetic flux can be adjusted by the amount of thermosetting resin mixed and the strength of the magnetic field during magnetization, making it possible to provide thick-film shaped magnets of all specifications. By using the non-magnetic substrate on which the thick-film magnet according to the present invention is arranged as a magnetic treatment device, it is highly safe and does not cause metal allergies even if it comes into direct contact with the skin, and the treatment effect is also high. It can be made high.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the manufacturing process of a thick film magnet according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the state of formation of a thick film magnetic composition in this example.

FIG. 3 is a perspective view showing the state of a thick film magnetic composition provided with an antioxidant coating in this example.

FIG. 4 is a cross-sectional view showing the state of a thick film magnetic composition provided with an antioxidant coating in this example.

FIG. 5 is a diagram for explaining the magnetization process in this example.

[Explanation of symbols]

1 Thick film magnetic composition 2　　　　　　　　　　　Substrate 3. It is a silicone resin film.

Claims (3)

[Claims] 1. A mixing process for producing a ferromagnetic material paste by mixing a mixed alloy powder of a ferromagnetic material and a thermosetting resin, and a thick film magnet using the ferromagnetic material paste produced in the mixing process. A first printing step of printing a ferromagnetic material thick film pattern of a desired shape and predetermined thickness on a non-magnetic substrate to form a ferromagnetic material thick film pattern, and heating the ferromagnetic material thick film pattern printed in the first printing step. a first heating step for curing; a second printing step for printing an antioxidant film so as to cover at least the thick film of magnetic material after heating and curing in the first heating step; A second heating step in which the printed thick film pattern of ferromagnetic material is heated and hardened; and a magnetization step in which the thick film of magnetic material is magnetized in the thickness direction after being heat hardened in the second heating step. A method for producing a characteristic thick film magnetic composition. 2. Forming a thick film on a non-magnetic substrate by mixing a ferromagnetic material with a thermosetting resin, and coating and curing the thick film magnetic material with an antioxidant film to form a thick film magnet. A thick film magnetic composition characterized by: 3. At least one ferromagnetic material is mixed with a thermosetting resin to form a thick film on a non-magnetic substrate, the thick film magnetic material is coated with an antioxidant film and cured, and then magnetized. 1. A magnetic therapy device using a thick film magnetic composition, characterized in that a thick film magnet is formed to match a treatment area.