JPS60224112A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To obtain a head which obviates tape squeaking and has excellent wear resistance, etc. by fixing a magnetic core formed by laminating thin core sheets via an insulating layer consisting of pulverous inorg. particles and insulating adhesive agent having heat resistance and insulating characteristic into a case packed internally with a fixing material contg. an org. lubricating agent. CONSTITUTION:Plural, for example, three sheets of the thin core sheets 2 each stuck with a pulverous particle layer 3 consisting of Al2O3, etc. having heat resistance, an insulating characteristic even after a heat treatment, >=5Mohs hardness and about <=15mu grain size are superposed to manufacture a laminate 5 joined tentatively only at the ends 4, 4 of the sheets 2 to each other. The laminate 5 is subjected to hydrogen annealing for two hours at 1,050-1,150 deg.C. The insulating adhesive agent such as epoxy resin is then impregnated into the layer 3 to form the insulating layer 6 and to join thoroughly the layers, by which a magnetic core half body 7 is completed. For example, four pieces of the magnetic cores 8 formed by joining the bodies 7 to each other via a magnetic gap are fitted into a case 9 with shielding materials 10, 11 in-between by means of an immobilizing material consisting of a resin or the like contg. metallic soap of higher fatty acid, the ester thereof, silicone oil or the like. Eddy current loss is thus decreased and a high-frequency characteristic, etc. are improved.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a magnetic head and a method for manufacturing the same, and in particular, the present invention relates to a magnetic head and a method for manufacturing the same, and in particular, a magnetic core made of a laminate of magnetic thin plates having a magnetic core shape is fitted into a case, and a fixing member is inserted into the case. The present invention relates to a magnetic head having a structure in which a magnetic core is fixed by filling the magnetic head with a magnetic core, and a method for manufacturing the same.

[Prior art]

In conventional magnetic heads of this type, the magnetic core-shaped magnetic thin plates (hereinafter referred to as core thin plates) constituting the above-mentioned laminate are completely insulated from each other to improve the high-frequency characteristics of the magnetic head. In order to improve the wear resistance of the core, a structure is known in which an insulating layer made of highly hard and insulating inorganic fine particles is formed on the surface of the thin core plate.

However, with this configuration, it is not possible to prevent so-called tape squeal, a phenomenon in which the sliding sound between the magnetic tape of the recording medium and the magnetic tape sliding surface of the magnetic head enters the head's recording/playback output as noise. There is a drawback that the inorganic fine particles in the insulating layer damage the magnetic tape and accelerate the occurrence of tape squeal.

On the other hand, in order to prevent the above-mentioned tape squeal, it is known that in the magnetic head of the type mentioned above, a fixing material filled in the case contains an organic lubricant.

However, with this configuration, contrary to the above-described configuration, the insulation between the core thin plates of the magnetic core laminate is poor, resulting in poor high frequency characteristics of the magnetic head and poor wear resistance of the magnetic core.

〔the purpose〕

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional magnetic heads. The object of the present invention is to provide a head and a method for manufacturing the same.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the manufacturing process of the magnetic head according to the present invention will be explained in order with reference to FIGS. 1 to 8.

First, as shown in FIG. 1, the aforementioned thin core plate 2 having the same external shape as the half-shaped magnetic core constituting the magnetic core is punched out from a thin metal magnetic material plate 1.

Next, as shown in FIG.
Return it to the punched hole 1a and fit it.

Subsequently, as shown in FIG. 3, heat-resistant and insulating fine inorganic particles are applied to the entire surface of one side of the metal magnetic material thin plate 1 including the core thin plate 2 by spraying, electrodeposition, etc. in a post-process. The fine particle layer 3 is formed by adhering the particles so as not to fall off during lamination.

Here, as the above-mentioned inorganic fine particles, 1
A material that has insulation properties even after heat treatment at 100° C. and has a hardness of 5 or more on the Mohs scale is used. Among these, particularly preferable ones are A/, 03AlO(OH), A
A(OH)3, MgOXMg(OH)t, S'02
etc. Of course, a combination of a plurality of these types may be used.

It is preferable that the thickness of the above-mentioned fine particle layer 3 is approximately 15 μm or less so as not to narrow the effective track width of the laminated body constituting the magnetic core, which will be described later. Use particles with a particle size of approximately 15 μm or less.

After forming the fine particle layer 3 as described above, the thin core plate 2 is extracted from the thin metal magnetic material plate 4 as shown in FIG. in this case,
Since punching is performed first, cutting from 1 to 2 can be done without having to resort to punching, punching, etc. That is, by performing punching before forming the insulating coating 3, there is no risk that the punching die will be damaged by the wide and hard fine particle layer 3, which would be the case if the order was reversed.

On the other hand, as another method for forming the thin core plate 2 with the fine particle layer 3, first, an insulating film is formed on the entire surface of one of the metal magnetic thin plates in the same manner as described above, and then a laser beam or other beam is applied. A method may be adopted in which the core thin plate is cut out from the thin plate by irradiation.

Next, the core thin plate 2 with the fine particle layer 6 formed as described above is prepared.
As shown in FIG. 5, a predetermined number of sheets are stacked to obtain the required thickness of the magnetic core, and then the core thin plates are stacked as shown in the side view (G) and plan view (B) shown in FIG. The thin core plates 2 are temporarily joined together only at the ends 4, 4 by a method such as irradiating the end faces of the thin core plates 2 and the fine particle layer 3 with a laser beam as shown by arrow B to obtain a laminate 5.

Subsequently, as shown by the arrow H in FIG. 7, the above-mentioned laminate 5 is subjected to heat treatment under required conditions to perform magnetic annealing of the laminate 5. For example, hydrogen annealing is performed at a temperature of 1050°C to 1150°C for 2 hours.

Next, as shown in FIG. 8, by impregnating the spaces between the core thin plates 2 of the above-mentioned laminate 5 or the fine particle layer 3 with an insulating adhesive such as epoxy resin, The fine particle layer 3 is fixed with an insulating adhesive to form an insulating layer 6.
At the same time, the entire surfaces of the thin core plates 2 are completely joined to complete the magnetic core half 7.

Although the subsequent steps are not shown, they are as follows.

First, a pair of magnetic core halves 7 obtained as described above are butted against each other via a magnetic gap and joined to obtain a υ magnetic core.

Subsequently, the above magnetic core is fitted into the case of the magnetic head, so that the magnetic gap of the magnetic core is exposed to an opening formed in the magnetic recording medium sliding surface of the case.

Next, the magnetic core is fixed by filling the case with a fixing material made of resin containing an organic lubricant, and then cylindrical grinding and lapping are performed on the sliding surface including the above opening. By finishing it to a mirror surface, a magnetic head as shown in FIG. 9 is completed.

This figure shows the magnetic head viewed from the above-mentioned sliding surface side. In the same figure, the reference numeral 9 indicates the above-mentioned case, and the reference numeral 8 indicates the magnetic cores. When fitted, each magnetic gear knob G side is on the sliding surface 9a of the case 9.
It faces the opening 9b of. Each magnetic core 8 is fixed by a fixing material 12 filled in the case 9.

In this embodiment, as described above, the fixing material 12 contains an organic lubricant. Preferred examples of organic lubricants include: metal soap C (RCOO) nλg) 0-17 mesozui ester, ethyl stearate, etc. made of metal salts of higher fatty acids such as stearic acid, oleic acid, and palmitic acid. Esters of higher fatty acids (RCOOR); higher alcohols such as oleyl alcohol and lauryl alcohol [:ROH:l:t-
Amines such as butylamine, aminopropionic acid, and cyclohexylamine nitrite; [R@H,] Silicone oils such as methyl polysiloxane, phenylmethyl silicone compounds, and methyl silicone compounds; Fatty acids such as oleic acid amide and stearic acid amide Amide [R
Examples include CONHJ. Of course, a combination of a plurality of these types may be used.

According to the configuration of the magnetic head of this embodiment as described above, the magnetic core half body 7 is formed from the laminate of the core thin plates 2 laminated with the aforementioned fine particle layer 3 and the insulating layer 6 made of an insulating adhesive interposed therebetween. Since the magnetic core 8 is constructed as shown in FIG.

Furthermore, the high hardness inorganic fine particles in the insulating layer 6 improve the wear resistance of the magnetic core.

Furthermore, as the sliding surface of the magnetic head is lubricated by the organic lubricant contained in the fixing material 12, the above-mentioned tape squeal is prevented from occurring, and the above-mentioned wear resistance is further improved.

Incidentally, abrasion tests and tape squeal tests conducted on the magnetic head according to this embodiment and a magnetic head having a conventional structure, and the results of both tests will be explained below.

First, the magnetic head according to this embodiment is used as sample (a), and three types of magnetic heads with conventional structures are used as samples (b) to ((1)
Ten pieces of each were prepared.

Among samples (b) to (d) with conventional structures, sample (b) uses the same magnetic core as sample (a) of this example, and the fixing material does not contain an organic lubricant. This is the structure used.

In addition, sample (C) uses a magnetic core composed of a laminate in which the aforementioned core thin plates are laminated only through an epoxy resin without intervening the aforementioned inorganic fine particle layer, and a fixing material containing an organic lubricant is used. The structure uses

Further, sample (d) had a structure in which the same magnetic core as sample (C) was used as the magnetic core, and a fixing material containing no organic lubricant was used.

In the abrasion test, five of each of the above-mentioned samples (a) to (d) were coated with γ-Fe20. Tape speed 4.75z/
sec for 200 hours, and then the average value of the amount of wear for each sample was calculated.

In addition, in the tape squeal test, γ-Fe203 tape was continuously slid on five samples (a) to (d) at the above-mentioned tape speed in an atmosphere with a temperature of 55 °C and a humidity of 50 °C. The elapsed time from the start of motion to the occurrence of tape squeal was investigated, and the average value was calculated for each sample.

The results of both tests are shown in the table below.

As is clear from this table, sample (a) of this example was:
Sample (B) has the least amount of wear, and the tape squeal generation time is shorter than Sample (C).
, (d) was significantly longer, and it was confirmed that the structure of this example improved the abrasion resistance and had an excellent tape squeal prevention effect.

〔effect〕

As is clear from the above description, according to the present invention, an insulating layer made of heat-resistant and insulating inorganic fine particles and an insulating adhesive is formed between the laminated core thin plate laminates constituting the magnetic core. The magnetic core is fixed in the case by filling with a fixing material containing an organic lubricant, which improves the high frequency characteristics and wear resistance of the magnetic head, and prevents so-called tape squeal over a long period of time. You can get excellent results.

[Brief explanation of the drawing]

1 to 6 (5), FIG. 7, and FIG. 8 are schematic side views sequentially showing the manufacturing process of a magnetic core according to an embodiment of the present invention, and FIG. FIG. 9 is a front view of the magnetic head completed by the method of the embodiment, as viewed from the side of the magnetic recording medium sliding surface. 1... Metal magnetic thin plate 2... Core thin plate 6... Fine particle layer 5... Laminate 6... Insulating layer 7... Magnetic core semi-dead 8... Magnetic core 9... Case 12...Fixing material patent applicant: Canon Electronics Co., Ltd. Procedural Amendment (July 20, 1980, Commissioner of the Japan Patent Office 1, Indication of the case, 1982 Patent Application No. 78398 2, Name of the invention: Magnetic head and Manufacturing method 3, relationship with the case of the person making the amendment Patent applicant name Canon Electronics Co., Ltd. 4, agent Telephone: 03 (268) 2481 (Detailed description of the invention column in the specification Contents of the amendment 1) Patent The scope of claims is amended as shown in the attached sheet. 2) “Fatty acid amide [RCO
NH2) The scope of the claims that includes “;perfluorosilicone oils such as perfluorosiloxane and perfluoromethylsiloxane, fluorinated oils such as fluoroesters and perfluorohydrocarbons” after J has been amended as follows. do. 1) A magnetic head that has heat resistance and insulation properties, in which a magnetic core made of laminated magnetic thin plates in the shape of a magnetic core is fitted into a case, and the magnetic core is fixed by filling the case with a fixing material. A magnetic head characterized in that a magnetic core is constructed by laminating the thin plates with an insulating layer made of inorganic fine particles and an insulating adhesive interposed therebetween, and the fixing material contains an organic lubricant. 2) As the organic lubricant, metal soaps made of metal salts of higher fatty acids such as stearic acid, oleic acid, and palmitic acid ((RCOO) nM), esters of higher fatty acids such as nioleic acid ester, and ethyl stearate (RCOOR) are used.
); Higher alcohols (ROH) such as oleyl alcohol and lauryl alcohol; Amines such as t-butylamine, aminopropionic acid, and cyclohexylamine nitrite (CRNH2); Silicone oils such as methylpolysiloxane, phenylmethylsilicone compounds, and methylsilicone compounds The magnetic head according to claim 1, characterized in that at least one of fatty acid amides such as oleic acid amide and stearic acid amide (fluorophores such as RCO) is used. 3) The magnetic head according to claim 1 or 2, wherein the inorganic fine particles have a particle size of approximately 15 gm or less. 4) Any one of claims 1 to 3, characterized in that the inorganic fine particles have insulation properties even after heat treatment and have a Mohs hardness of 5 or more. The magnetic head described in . 5) A process of laminating core-shaped magnetic thin plates with a layer of inorganic fine particles having heat resistance and insulating properties attached to the surface, and a process of applying heat treatment to the whole after joining only a part of the laminated thin plates. and a step of impregnating an insulating adhesive between the laminated layers after the heat treatment to form an insulating layer with the fine particles and completely bonding the laminated layers to obtain a laminated body constituting a magnetic core. A method for manufacturing a magnetic head characterized by: 6) A core-shaped thin plate having the layer of fine particles attached to its surface is obtained by punching out a magnetic thin plate into a core shape and then attaching the layer of fine particles to the surface thereof. The method for manufacturing a magnetic head according to item 5. 7) A core-shaped thin plate with the fine particle layer adhered to the surface is obtained by a step of attaching the fine particle layer to the surface of the magnetic thin plate and then cutting the thin plate into a core shape by beam irradiation. A method of manufacturing a magnetic head according to claim 5.

Claims (1)

[Scope of Claims] 1) In a magnetic head in which a magnetic core formed by stacking magnetic thin plates in the shape of a magnetic core is fitted into a case, and the magnetic core is fixed by filling the case with a fixing material. , the magnetic core is constructed by laminating the thin plates through an insulating layer made of heat-resistant and insulating inorganic fine particles and an insulating adhesive, and the fixing material contains an organic lubricant. magnetic head. 2) As the organic lubricant, metal soaps made from metal salts of higher fatty acids such as stearic acid, oleic acid, and valmitic acid [(RCOO) nM) nioleate esters,
Esters of higher fatty acids such as ethyl stearate [:RC
OOR] Higher alcohols such as nioleyl alcohol and lauryl alcohol [ROH]; Amines such as t-butylamine, aminopropionic acid, and cyclohexylamine nitrite [RUH2]; Methylpolysiloxane,
Silicone oils such as methyl silicone compounds, methyl silicone compounds, fatty acid amides such as nioleic acid amide and stearic acid amide [RCONHJ,
The magnetic head according to claim 1, characterized in that at least one type of magnetic head is used. 3) The magnetic head according to claim 1 or 2, wherein the inorganic fine particles have a particle size of approximately 15 μm or less. 4) The inorganic fine particles have an insulating property even after heat treatment and have a Mohs hardness of 5 or more. a step of laminating the laminated thin plates, a step of heat-treating the whole after bonding only a part of the laminated thin plates, and a step of impregnating an insulating adhesive between the laminated layers after the heat treatment to insulate the laminated sheets with the fine particles. 1. A method of manufacturing a magnetic head, comprising the steps of forming layers and completely bonding the laminated layers together to obtain a laminated body constituting a magnetic core. 6) A patent claim characterized in that a core-shaped thin plate with the layer of fine particles adhered to the surface thereof is obtained by punching out a magnetic thin plate into a core shape and then attaching the layer of the fine particles to the surface thereof. A method for manufacturing a magnetic head as recorded in item 5 of the scope. 7) After attaching the layer of fine particles to the surface of the magnetic thin plate, the thin plate is cut into a core shape by beam irradiation. 6. A method of manufacturing a magnetic head according to claim 5, wherein the method comprises: obtaining a magnetic head;