JPS6030090B2 - Manufacturing method of magnetic sheet - Google Patents

Description

[Detailed Description of the Invention] The present invention makes the orientation of ferrite particles inclined with respect to the magnetized surface by magnetizing them on the same surface, effectively utilizing the magnetic properties inside the magnet, and increasing the magnetic flux density on the surface. The present invention relates to a method for producing a magnetic sheet that can be used in various ways.

The conventional method for manufacturing magnetic sheets is to pass a mixture of scale-shaped ferrite particles that have been subjected to magnetic anisotropy treatment and a soot material made of rubber and/or synthetic resin that bonds these ferrite particles between rotating rolls. The particles are oriented in the rolling direction of the sheet to obtain a magnetically anisotropic sheet-like magnet material that exhibits ferromagnetism in the thickness direction of the sheet.

Such sheet-like magnet materials are laminated to a predetermined thickness and magnetized to form a magnet sheet, but the surface magnetic flux density is small.

The present invention eliminates the drawbacks of the prior art as described above.

Hereinafter, an embodiment of the method for manufacturing a magnetic sheet of the present invention will be described in comparison with the above-mentioned conventional example.

First, as shown in FIG. 1, a mixture of scale-shaped ferrite particles 1 that have been subjected to magnetic anisotropy treatment and a medium 2 made of rubber and/or synthetic resin for bonding the ferrite particles 1 is passed between rolls 3 to form the ferrite particles. The particles 1 are oriented in the rolling direction of the sheet to produce a magnetically anisotropic sheet-like magnet material 4 that exhibits ferromagnetism in the thickness direction A rather than the length direction B of the sheet as shown in FIGS. 2a and 2b. As shown in FIG. 3, this sheet-like magnet material 4 is laminated in a flat plate shape so as to be bonded with an adhesive or the like, and this laminate 5 is cut diagonally as shown in FIG. 4. By making a magnet sheet 6 in which the orientation of the ferrite particles is intentionally changed obliquely with respect to the sheet surface and magnetizing it on the same surface, a ferromagnetic magnet sheet with a high surface magnetic flux density can be obtained.

Below are five examples in which the orientation of the ferrite particles is different in comparison with a conventional magnet sheet.
The orientation of the ferrite particles in Example o of the present invention and Example 900 of the present invention will be explained.

Here, to make it easier to understand, S and N poles are alternately polarized on the same surface of the sheet, and the S pole magnetized part, the part where magnetic flux flows from the S pole to the N pole, and the N pole magnetized part are explained. As shown in Figure 5, when the same amount of magnetic flux 1 flows in certain parts (parts where magnetic flux flows are remarkable) i, k, and j, the magnitude of the magnetic force (magnetic flux density) is ) will be estimated. At this time, it is assumed that a material is used in which the ratio of the magnitude of the magnetic force of the sheet-like magnet material 4 in the A direction and the B direction is wave=A. First, if we consider the conventional example of orientation oo of ferrite particles in FIG.
Since the magnetizing magnetic flux flows in the direction m perpendicular to the sheet 6 on the two magnetized surfaces, the characteristics in the A direction are utilized as they are. However, at the distance k between the poles, the magnetic flux flows in the creeping direction n with the sheet 6, so the B
Only the directional characteristics will be used, and only a small magnetic force will be utilized.

Next, as shown in Figure 7, the orientation of the ferrite particles is adjusted to 900.
We will explain the case when .

The magnitude of the magnetic force between the magnetic poles is opposite to that shown in FIG. 6, and the magnetic pole portion has a characteristic in the B direction, and the magnetic flux has only a characteristic in the A direction. In order to compare this relatively, converting only the characteristics in the A direction, [in the case of 00] Shuu B = Jukai = 2-Hiroshi [in the case of 900] San A: etc. = 2. .

A, and it can be seen that the magnetic force is stronger when the orientation of the ferrite particles is aligned with the creeping direction of the sheet 6.

Next, as shown in FIGS. 8 to 10, the orientation of the ferrite particles is tilted and the same reasoning is made for 300, 450, and 600.

In this case, the amount of attached magnetic flux is vector-decomposed into the A direction and the B direction with respect to the sheet 6.

[In case of 300] Two porcelain pipes Li A + cloud Magnetic pole chest + potato B So, summing this up, we get 2 (one character A + heat) Jukai + Lee B If we replace B characteristic with A characteristic, ノ3A+sha+kai+pier A = 11 A-shaped crosses = 3.1M becomes.

[In case of 450] Two porcelain gutter armpits are combined together and the whole is completed. From the OA arc that becomes 'Ma3 (-Iwao) Volume 10 = A (Rojyupo) = 3.1 ship becomes.

, [in case of 600] 2 Gyakurei + Multi-B Next door: Li Jusha Then, Overall 2 (Kai + Kaku B) + Kaku A+ No. From A=2B A + Li A cross juzen = A (1V 13) 32-9 ship becomes.

From the above results, when magnetized on the same surface, if the ferrite particles are oriented 30 to 45 degrees in the creeping direction of the sheet 6, the magnetic force is greater and a higher surface magnetic flux density can be ensured.

Next, as a result of experimentally measuring this characteristic, as shown in FIG. 11, it was confirmed that the above reasoning almost completely applied.

Furthermore, even when this magnet sheet (ferrite particle orientation 45o) is rolled up to form a roll-shaped magnet and magnetized on the outer surface, the surface magnetic flux using conventional sheet-shaped magnet material is 800 to 900 Gauss. However, it was confirmed that the density increased to 1,100 to 1,400 Gauss.

As described above, according to the method for manufacturing a magnet sheet of the present invention, by magnetizing on the same surface, the magnetic force of the entire magnet can be effectively utilized, resulting in a high surface magnetic flux density, and a light specific gravity of 3.5. By improving the surface magnetic flux density, it is possible to make it smaller and lighter, and it is also flexible and can be processed into any shape, making it of great industrial value.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the processing steps of a sheet-like magnet material in an embodiment of the method for manufacturing a magnet sheet of the present invention, and Fig. 2 a and b are the thickness direction A and length direction of the same sheet-like magnet material. A magnetic characteristic diagram of B, FIG. 3 is an explanatory diagram of the processing process of the same magnet sheet, FIG. 4 is a front view of the magnet sheet obtained from the same process, and FIG. 5 is an explanatory diagram showing the relationship between magnetization and magnetic flux. Figures 6 to 10 are explanatory diagrams showing the flow of magnetic flux when the orientation of ferrite particles is 00, 900, 300, 450, and 600, and Figure 11 is a characteristic diagram showing the relationship between surface magnetic flux density and the orientation angle. It is. 1... Ferrite, 2... Sooty, 3... Roll, 4...
... Sheet-shaped magnetic material, 5... Laminate, 6... Magnet sheet. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1 A step in which a mixture of ferrite particles and a medium is passed between rotating rolls to form a sheet-like magnetic material in which the ferrite particles are oriented in the rolling direction, and the sheet-like magnetic material is laminated in a flat plate shape and then diagonally stacked. 1. A method for producing a magnetic sheet, comprising the steps of cutting the magnetic sheet into ferrite particles and tilting the orientation of the ferrite particles.