JPS5817525A - Magetic core and its manufacture - Google Patents

Abstract

PURPOSE:To prevent deterioration in magnetic characteristics due to a short circuit between adjacent cores by interposing inorganic fine powder, which has electric insulating properties and heat resisting properties, in lamination gaps of laminated cores. CONSTITUTION:Cores formed by press work are stacked and charged in a holder. A liquid which contains dispersed inorganic material fine powder is allowed to permeate gaps of the cores and then a solvent is vaporized to form the inorganic fine powder in the gaps of the stacked cores. Magnetic annealing is performed to remove strain, improving magnetic characteristics. The inorganic magnetic fine powder is durable at high temperatures sufficiently, so adjacent cores are never welded. Further, it has electric insulating properties, no short circuit is caused. As a liquid for carrying the inorganic material fine powder, inorganic solvents such as methanol, ethanol, acetone, methyl acetate, etc., are usable and as the inorganic fine powder, silica, alumina, magnesium, etc., are usable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic core comprising an inorganic material having electrical insulation and heat resistance between layers of a laminated core, and
It is related to the manufacturing method.

- The high magnetic permeability material used as the core material of the magnetic head is Senmes F1 Fetzite. Among these, the metal-based materials such as Permai and Sendust have low resistance, so they are pressed into thin plate shapes and formed into a laminated structure of nine core materials to reduce eddy current loss.

However, if the laminated junction is electrically short-circuited at some j[Iil, an eddy current flows in the part where f11 is stepped, and the electromagnetic conversion efficiency decreases. Therefore, if each layer of the laminated core material (hereinafter referred to as core) is electrically insulated, eddy current loss will be reduced and electromagnetic conversion efficiency will be improved.

On the other hand, in order to electrically insulate between the layers of the laminated magnetic core, it is necessary to provide an insulating layer between the laminated layers, but the process of providing this insulating layer complicates the manufacturing process of the magnetic core. Manufacturing: This is the cause of high strikes.

No. 1114), 伽) is a 110-piece structure that shows the traditional magnetic core O-mimori pattern.

111i) is an insulating layer in the gap between laminated layers (adhesion strength O1i)
Magnetism; magnetism in A **0 Measure the thickness of the 9 pieces.Make multiple O thin plates (=7) in one press operation of ``press punching'', and 1 piece of ``magnetic annealing''. In order to improve the magnetic properties by removing the processing distortion of the core caused by press punching, we applied an organic polymer adhesive to the core 01111 by spraying or using a method such as "Insulating layer adhesion". At 11 of ``Stack'', multiple cores are stacked and ``pressure/pressure'' is applied.
, pressurize and heat (under 20OCsL) for 1 day with IlI fever.
to cure the adhesive. Then, they are stacked in a predetermined track radius to form nine magnetic bubbles. And this O
Let's sleep 1/4 to 4! A magnetic head is manufactured using a magnetic core.

Dew 2 ■ 伽) is magnetic; simplifies and familiarizes the manufacturing needs of
9; ○Receive the specified part f#
While welding using an electric welding method such as electric welding, a predetermined O track sr: 1ljlltL & 1 was carved into the predetermined O track sr: 1ljlltL & 1, and was produced by press wrought IIIK with a "magnetic annealing" O1 machine; This is to improve the magnetism** by examining the machining distortion of the material.

"Insulating layer adhesion" method 1 shown in wire connection 1 -) using this method
1 is not left behind, the press-formed cores can be immediately packed in the hole and laminated, improving work efficiency. However, in step 1 of ``magnetic annealing'', the annealing temperature is 1000C to 110C.
Welding is likely to occur in the gap between the cores that are rounded at 0°C, and the 70 * Welding m product is Im welding KI! As mentioned above, if the area is wider than the current area, the nine-member current loss will increase and the electromagnetic conversion characteristics will deteriorate.

The second layer is manufactured by the preparation method shown in Figure 1 (Xu, G) and exhibits an effective magnetic permeability equivalent to each of the magnetic cores.

In 11111I, 1 line 1II (as shown in ω, it is bonded with resin and exhibits 9testrin 10# properties, and snow is 1I
I(2) shows the test Linda O goodness 1 which is close to Goodness <*.

It can also be seen that in the high frequency band above 5101QLs, the test cylinder that has been welded has a reduction in the effect rate O.
Are standing.

Next, the electromagnetic conversion characteristics of the magnetic spatula V, which incorporates the nine magnetic cores in contact with the sjl and the magnetic cores bonded with resin, are described in the 11th section.
Shown in 1.

As can be seen from Table 1, the welded magnetic core t! When compared with a magnetic head embedded with a magnetic core tlIII bonded with resin, a magnetic head embedded with a regenerated slurry, aS
S decreased by 1.3 to 2 dB, and the recording frequency response decreased to 0, s.
~1.2dl decreased, and further maximum output level (MOX,)
has decreased by 1.2 to 2.411. This is because the electromagnetic conversion efficiency decreased due to the electromagnetic current loss caused by the adjoining adhesion caused by the magnetic annealing described above.

In this way, as shown in Figure 1, magnetism =
Although the manufacturing method of the magnetic core in the form of No. 7 has nine advantages, it also has the drawback of impairing the magnetic properties required of the core.

Furthermore, in a method of manufacturing a magnetic core in which the core is bonded with resin, the core is bonded with resin first.

A method of performing magnetic annealing after that is considered, but since an organic polymer adhesive is used as the resin, the insulation and adhesive properties are lost at around 200 C, so this is not practical.

This fact is shown in Fig. 1-), ie, the production cost associated with the complicated skin of the coagulation process 1).

That is, one purpose is to prevent the decrease in magnetic **0 due to the adjacent SW;A0F11 circuit.

Hereinafter, the contents of this proposal will be explained in detail using examples.

The third panel is a diagram showing the construction method of the core 12 for a magnetic head according to the present invention.

1 In the 311th step, the number II cores obtained by the process of "l-res removal" are laminated and filled into a holder! be done. Due to microscopic particles that have been fluorinated during press cutting, a gap with a width of 1 to 5 am is created between adjacent =7 layers. The width of this space does not change even immediately after welding shown in No. 311.

In this article, a fluid (11 bodies) containing inorganic fungal powder is infiltrated into the gap between these adjacent cores, and then IIKI
It evaporates the I medium (organic agent).

Therefore, in the gaps between the stacked cores, inorganic fine powder (however,
(having electrical insulation and heat resistance) is formed.

Honji 11KTh, liquid inorganic mold powder is described above, 9-
In order to do this, it is necessary that the casing itself has the property of naturally entering the 0#%/% knee barrier of 5 sm or less. The physical conditions of the OI body are as follows: ■ *wia force must be small, Φ viscosity must be relatively small, ■ steam shielding must be loud.

The phenomenon in which a liquid enters a narrow gap is generally known as a capillary phenomenon, but the capillary phenomenon, where the *iit* force is small, is serious. Here, the gap K11 is 5 μ or less, and the tension is 40, of course, 1-
It is preferable that the viscosity is less than 0, but in order for the casing to transport inorganic substances into the interior of the tll1MO, the viscosity of Hiro-Ame S* is required. For this reason, it is preferable that the llIi degree is 300·p (centiizes) or less.On the other hand, after the powder has penetrated into the gap in the core, the casing will be
It is preferable to leave the casing for 1 hour, but it is also possible to destroy the casing by heating etc.
In this case, it is most preferable that the casing itself has an irises on the inside.

In this way, the rounding l1 of laminating and impregnating the first section of 9 = A with fine inorganic powder is carried out immediately after the completion of the process of "packing in the holder" shown in 3- (i.e., before the ** process IIO). )K can be done. However, depending on the pigeon coop, it may be possible to set a knee of 0 work 1 straight 11Krjl pieces "to fill the holder" and weld nine or more cores stacked together, and to make it possible to do the work after the meeting which was far before INK due to Ia. Next, magnetic annealing is performed at the knee of "magnetic annealing" to remove strain and improve magnetic properties.

The above-mentioned inorganic fine powder has a high II (1
(000°C to 1100°C) K is 0, so there is no chance of adjoining cores adhering to each other, and since it has electrical resistance, short circuits will not occur. If a magnetic head is manufactured using the ζOIm core, a magnetic head with excellent magnetic properties can be obtained.

1841f(s), k) C is a side view of the laminated core in the impregnation process 11OIIRY11 shown in FIG. 4th (-9) KThln stacked: 174
．． Ichinoseki is formed by 40141KaΔs4a*,
Inorganic fine powder S may be interposed in 70IIM01?1.

4th - (Ten)Hiro impregnation process oy1@o indicates the state i
1 plot @ survived and shishi, Rattan 4-1) shows that the plot evaporates and disappears after that, indicating a good state. In the 4th Cabinet), III * L e;
Since there is an insulating material between the two cores, there is a problem that prevents the cores from coming into contact with each other, except for the welded parts of Paris 4a and the hidden parts.

The S garden can be manufactured by the manufacturing method shown in FIG. 111 (IL) and FIG. 3, and exhibits a test leader that is equal to the respective magnetic cores. It is U71i. In No. sII, No. 1114) K shows the O characteristics of the test Jida bonded with resin as shown in Fig. show. As can be seen from No. 1 Il@I, the test ring prepared using the original method has better magnetic properties. The test ring manufactured by the manufacturing method shown in Part 1) was
The resin used as an adhesive contracts with the bending, causing stress and strain inside the Testrinr, which is why the magnetic 41! In the present invention, welding is used and magnetic annealing is performed, so that stress distortion does not occur, and as a result, the magnetic properties are excellent.

Next, the electromagnetic conversion characteristics of the magnetic head incorporating each magnetic core are shown in 2nd *.

As can be seen from Table 1 of Table 2, the magnetic head incorporating the magnetic core of the present invention has a regenerating #IL number of 0.11 when compared with a magnetic head incorporating magnetic = 7 bonded with resin. ~1.
・41 improved, - sound frequency 411 characteristics 0.7 to 0, *4
11, and the maximum output level (MoL) has increased by 0.8-
It has improved by 1.5dB. As described above, the present invention is capable of simultaneously reducing the cost associated with the simplification of the magnetic atom production process and improving magnetic properties.In this invention, the liquid for transporting the inorganic fine powder is methanol,
When using organic solvents such as ethanol, acetone, methyl ethyl ketone, methyl acetate, and ethyl acetate, it has been possible to achieve the desired O. , as inorganic fine powder,
Inorganic oxides with high heat resistance and insulation properties can be used, such as silica (81 false), aluminum oxide (MgO), calcia (CaO), and zirconia (ZrO).

As mentioned above, this Il & beak prevents the adjoining of the adjacent layers of inorganic substances due to the lamination gap □ of the core, so the electrical resistance decreases due to a short circuit between one layer. Therefore, it is possible to prevent an increase in eddy current loss and prevent deterioration of magnetic properties in a high frequency band. Further, it is important to significantly improve the electromagnetic conversion characteristics of the magnetic head at high frequencies.

[Brief explanation of the drawing]

Figure 1 (roll) is a block diagram of l- showing the conventional magnetic core manufacturing method in which laminated cores are bonded together. Block diagram of the process shown, 1st! The figures are shown in Figure 1) and 弽), which show the effective magnetic permeability of the test ring that can be prepared depending on the manufacturing method.Figure 3 shows the effective magnetic permeability of the test ring. 401m Qi core O construction method is shown and the configuration diagram of Kuko II is shown. 4th ■ (→, 伽) is the real i * os Qi Pua is shown in Confucian Cao Ill←) and 3rd ml is shown. Dart 7I showing the effective magnetic permeability of the test ring manufactured by the lateral advancement method
! . 4...Core, 4m...Paris, 5...Inorganic fine powder,...Preparation. License applicant Canon Co., Ltd. Figure 1 Figure 2

Claims (1)

[Scope of Claims] (1) A core OI that can be laminated using a sifting process with an inorganic fine powder having electrical insulation and heat resistance interposed between the l1jl and multiple O-poor O laminations! A magnetic core that is characterized by being pressed by casting. (Review) The plurality of =7 is made of a material with low resistance, and the nine are made into 41 molds.
a. (3) The air-brewing core described in claim 1, wherein the laminated gap is filled with a Δ warp caused by punching the core. (4) The light fitting has a knee for laminating II number of cores, a welding process for welding and fixing the laminated plurality of cores, and a knee for magnetically annealing the plurality of cores that can be welded. Engineering @
A magnetic material characterized by a laminated layer-1111 having a process 1 impregnated with a fluid tube containing inorganic fine powder to have electrical insulation and heat resistance; The O side production method is also (2) a fluid containing the inorganic fine powder with a tension of 0 and 40
4. A method for producing an O1 core according to claim 4, characterized in that the viscosity is 300 ep or less. (Casting) The method for manufacturing a magnetic core according to claim 4'Jli or claim 5, characterized in that the wrinkles at the end of the machine mold are treated with an organic preparation.