JPS63149805A - Core and core piece for magnetic head and processing method for same - Google Patents

Abstract

PURPOSE:To reduce the manufacture cost by applying thermal diffusion of glass material coated respectively to steps of a core piece so as to apply glass bonding to a couple of sliders. CONSTITUTION:Track slots 14a, 14b with a prescribed interval are formed to a side core 10 and a center core 12. A cavity hole 14 is formed to the upper face of a magnetic red/write side core block 16, a slot 25 is provided to the position of the hole 14 and a hole 24 and a slot 28 are provided similarly to a side core 18 and a center core 20. Then both core blocks 16, 22 are bonded tentatively to the bonding face via a spacer 38, each slot 25 formed to the upper part is positioned properly to form a core block 28. Then a glass plate 40 is arranged onto the projection/recessed part at the upper face of the block 28 and molten to apply glass bonding to the bonding part of both blocks 16, 20. The core block 28 is sliced at a prescribed position in each slot subjected to glass filling and a bulk form magnetic read/write part and erasure part are formed on the upper face and a core piece 30 having a step for slider mount applied with glass coatings 40a, 40b is constituted to the upper part of each side face.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head for performing magnetic recording and reproduction, and in particular to a magnetic head that has improved mechanical strength, heat resistance, and moisture resistance of the core that constitutes the magnetic head. The present invention relates to the structure of a core and its processing method.

[Conventional technology]

Conventionally, the core processing method used to manufacture magnetic heads used in discs, etc., was to process each core to a predetermined size and fill the holes that form the magnetic reading/writing section and erasing section with glass. A center core and side cores are bonded by glass bonding to form a core block, and this core block is sliced at predetermined intervals to form core pieces of a predetermined thickness. Organic adhesive or the like is used for each core piece obtained. It is known that a core unit is constructed by fixing a pair of sliders together.

FIGS. 11 to 18 show the processing steps for the conventional magnetic head core described above. In FIG. 11, reference numerals 10 and 12 indicate a side core and a center core made of a magnetic material, respectively.
As shown in (b), track grooves 14a and 14b for forming magnetic read/write sections are formed with a predetermined pinch. Next, FIGS. 12(a) and (bl
Glass filling is performed as shown in FIGS. 13(a) and 13(b), and then lapping is performed to remove excess glass material and to adjust the dimensions and give a mirror finish to the joint surfaces, as shown in FIGS. 13(a) and 13(b).

As shown in FIG. 14, the side core 10 and center core 12 configured in this manner are combined so that the track grooves 14a and 14b are aligned with each other, and the quartz film and glass are thermally diffused between the bonded surfaces. These side cores 10 and center core 12 are bonded and fixed to form a predetermined gap to form a magnetic reading/writing section side core block 16 having a hole 14 for forming a magnetic reading section and a 4F entry section on the upper surface. In addition, in the same manner as in the above-described machining process, a magnetic erasing part side core block 22 consisting of a side core 18 and a center core 20 as shown in FIG. 15 is constructed, and a hole 24 for forming a magnetic erasing part is bored in the upper surface. . Furthermore, the core block 16 on the magnetic reading/writing section side and the core block 22 on the magnetic erasing section side are glass-bonded via thin glass plates 26 at the Senku cores 12 and 20 portions, respectively, to form a certain core block 28 in which the center core is laminated. Configure.

Next, this core block 28 is sliced into a predetermined shape using a slicing machine or the like to obtain a core piece 30 as shown in FIG. Processing is performed to properly form bulk magnetic read/write and erase portions on the top surface. Furthermore, as shown in Figure 18,
A core unit 36 is constructed by bonding sliders 32 and 34 to the tops of both highly precisely polished sides of the core piece 30 using an organic adhesive. By appropriately attaching a coil, a rear core piece, etc. (not shown) to this core unit 36, a desired magnetic head can be constructed.

[Problem that the invention seeks to solve]

In the conventional magnetic head core processing method described above, an organic adhesive made of epoxy resin or the like is generally used when bonding the core piece and the slider.

However, the core structure made of an organic adhesive does not have sufficient mechanical strength, heat resistance, and moisture resistance, and has the disadvantage that the bonded surfaces become misaligned during long-term use, resulting in unstable operating characteristics. In addition, as a conventional inorganic adhesive technology,
A method using a Pbo-based glass sputtered film is known, but it has the disadvantage that the processing steps become complicated and the manufacturing cost increases.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a core for a magnetic head, which can easily and reliably bond a core piece and a slider with glass, has good workability, and has excellent durability and stable operating characteristics, and a core piece thereof. These processing methods are provided below.

[Means for solving problems]

A core for a magnetic head and a processing method for a core piece thereof according to the present invention include two sets of side cores and a center core laminate piece, and a hole forming a read/write portion along the joint end surface of one of the side cores and the center core laminate piece. and aligning and arranging the holes forming the erased part along the joint end surface of the other side core and the center core laminate piece,
After these side cores and center core laminate pieces are bonded and fixed via a glass material, these center core laminate pieces are laminated and bonded to form a core block, and this core block is sliced to a predetermined thickness to make each piece the same. In a method of manufacturing a core for a magnetic head, a core piece is formed, and a slider is bonded and fixed to both sides of an upper end portion of the core piece in which the hole is provided, in which a read/write portion is formed along each bonded end surface. For a joined body of two sets of side core and center core laminated pieces in which the holes and the holes forming the erased portions are aligned, a certain groove is machined at a predetermined distance on the end face where each hole is provided, and then these are joined. Each center core laminated piece of the body is laminated and bonded via a spacer while positioning the groove, and the holes, grooves, and joints are simultaneously filled with glass to form a core block, and this core block is filled with glass. A core piece is formed by slicing at a predetermined position within the groove to form a core piece having steps covered with a glass material on both sides of the upper end, and the glass material coated on each step of the core piece is then thermally diffused to form a pair of core pieces. The slider is bonded to glass.

Further, the core piece of the magnetic head core obtained by the processing method of the present invention is composed of two sets of side cores and a center core laminate piece, and a read/write part is formed along the joint end surface of one side core and the center core laminate piece. The holes were aligned and arranged, and the holes forming the erased part were aligned and arranged along the joint end surface of the other side core and the center core laminate piece, and these were joined to the joint part between the side core and the center core laminate piece via a glass material. After that, these center core laminate pieces are laminated and bonded to form a core block, and this core block is sliced to a predetermined thickness to form a core piece of a magnetic head core, in which two sets of side core and center core laminate pieces are joined. grooves are provided in advance at predetermined intervals on the end face of each hole, and these grooves are positioned and laminated and bonded via spacers, and each hole, groove, and joint portion are filled with glass at the same time. The core block is sliced at a predetermined position within the groove filled with glass, and both sides of the upper end are provided with a stepped portion coated with a glass material.

Furthermore, in the magnetic head core obtained by the processing method of the present invention, side cores to which coils are attached are bonded and fixed on both sides of a center core that is laminated and bonded, and a read/write portion and a A magnetic head core comprising a core piece provided with a hole forming an erasing section, and a pair of sliders bonded and fixed to both sides of the upper end of the core piece,
It is characterized in that the step portions on both sides of the upper end of the core piece are coated with a glass material in advance, and the glass material is thermally diffused to bond and fix each pair of sliders.

[Effect]

According to the core for a magnetic head according to the present invention, before slicing the core block to construct the core piece, grooves of a predetermined size are processed in advance at the upper end on the side where the slider is attached, and each groove is filled with a glass material. , then slice the core block in place within this glass-filled groove.
ζConstructing a core piece, as a result, forming step portions covered with a glass material at the upper ends of both sides of the core piece, and simply bonding the slider by thermally diffusing the glass material coated on the step portions. I can do it.

In this case, the groove formed at the upper end of the core block, the hole forming the magnetic read/write section, and the joint at the center of the core block are filled with glass at the same time, thereby simplifying the processing process and making it more stable. Bonded fixation is achieved.

〔Example〕

Next, embodiments of the magnetic head core according to the present invention will be described in detail below with reference to the accompanying drawings showing a typical processing method thereof.

FIG. 1 to FIG. 1θ show one embodiment of the processing steps for a magnetic head core according to the present invention. In this embodiment, for convenience of explanation, the same components as those of the conventional magnetic head core shown in FIGS. 11 to 18 are as follows.
The description will be made using the same reference numerals.

In FIG. 1, reference numerals 10.12 indicate side cores and center cores, respectively, and these side cores 10.
The track grooves 14a and 14b are formed in the center core 12 at a predetermined interval, respectively.
It is similar to the conventional magnetic head core shown in the figure. Therefore, in this embodiment, as shown in FIG. 2, the side cores 10 and the center core 20 are bonded and fixed to form a gap before glass filling, thereby forming the magnetic reading/writing section side core block 16. . Therefore, a hollow hole 14 is formed in the upper surface of this magnetic reading/writing section side core block 1G. Furthermore, as shown in FIG. 3, the upper part of the core piece 30, which will be described later, is cut into grooves at a predetermined distance in relation to the position of the hole 14 provided on the upper surface of the magnetic reading/writing unit side core block 1G. These grooves 25
Full thickness processing is applied to each. In addition, in the same manner as the above-described processing process, the side core 18 and the center core 2o
The core block 22 on the side of the magnetic erasing section is formed with a hole 24 forming the magnetic erasing section on the upper surface and a groove section 2.
8 will be deleted.

Next, as shown in FIG. 5, the magnetic reading/writing section side core block 16 and the magnetic erasing section side core block 22 are temporarily joined to their joining surfaces via spacers 38, and a The core block 28 is constructed by positioning each groove 25 in a normal manner. Here, the spacer 38 has a hollow structure into which molten glass is injected, and is configured so that unnecessary portions can be appropriately removed during cutting of the core piece.

Next, as shown in FIG. 6, a glass plate 40 is placed on the uneven portion of the upper surface of the core block 28.
0 is melted to form a core block 22 as shown in FIG.
The groove portion formed on the upper surface, the holes 14 and 24 forming the magnetic reading section 7M writing section and the erasing section, and the internal cavity of the spacer 38 are filled with glass, and the magnetic reading/writing section I recore block 16 and the magnetic erasing section are filled with glass. Side core block 22
Glue the joint with the glass.

Furthermore, as shown in FIG. 8, the core block 28 is
Each groove filled with glass is sliced at a predetermined position, and as shown in FIG. 9, a bulk magnetic reading/writing section and an erasing section are appropriately formed on the top surface, and a glass plate 1E40a is placed on the top of each side surface. , 40b is formed, and the core piece 30 has a stepped portion for attaching a slider.

As shown in FIG. 10, this core piece 30 includes a glass plate 140a at each slider mounting portion.

40b by thermally diffusing the sliders 32 and 40b, respectively.
and 34 are bonded to glass to form a core unit 36. A desired magnetic head can be constructed by attaching a coil, a rear core piece, etc. (not shown) to the core unit 36.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention,
When processing a core unit from a core block, a groove provided on the top surface of the core block is filled with glass in advance, and the core block is sliced within the glass-filled groove to create glass-covered step portions on the tops of both sides. By forming a core piece having the following properties and further heat-diffusing the glass-coated portion of this core piece, a slider can be easily and reliably bonded to glass, and a core for a magnetic head with excellent mechanical strength, heat resistance, and moisture resistance can be obtained. Obtainable.

In addition, the processing process is simplified by simultaneously filling glass into the grooves on the top surface of the core block, the magnetic reading/writing section, the erasing section, the magnetic reading/writing section side, and the magnetic erasing section side at the joint parts of each core block. At the same time,
Since only the necessary parts of the rear core piece mounting surface need be mirror-finished, the mirror-finished area can be reduced, which not only improves the quality of the core for this type of magnetic head, but also significantly reduces manufacturing time and manufacturing costs. can be reduced to

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIGS. 1 to 10 are perspective views and top views of the core, respectively, showing an example of the processing steps for a magnetic head core according to the present invention, and FIGS. 11 to 18 are conventional processing steps for a magnetic head core. FIG. 3 is a perspective view of each core showing the process. 10.18. ,,Side core 12,20. ,, Center Core 14.24. ,,holes 16,22,28.
,,core block 25,,,groove portion 26. ,
, glass plate 30 , core piece 32 , 34 . ,
, slider 36, , core unit 38. ,,Spacer 40,,Glass plate 40a, 40b,,,
Glass coating patent applicant Nippon Chemi-Con Co., Ltd. FIG・'(Q) (b) FIG, 2FIG, 3
FIo, 4 FIG, 5J5 ZZ
nFIG, 8
FIo, 9FIG, 10 FIG, 16 FIG, 17FIG, 18 Procedural amendment (Gin, January 20, 1988, Commissioner of the Japan Patent Office, Kuro 1) Akiyu 1, Indication of case Patent Application No. 295027 of 1988 2, Invention Name of magnetic head core and its core piece and its processing method 3, relationship with the correction case
Nippon Chemi-Con Co., Ltd. F. Watahiki Watahiki 4, Agent 6 Contents of Amendment Patent Application No. 61-295027 Amendment 1, "Processing process" on page 5, line 11 of the specification is amended to read "Processing process" . 2. Correct "Mirror finish" on page 6, line 3, to "Mirror finish". 3. Same page 6, line 13 - Correct "processing process" to "processing process". 4. On page 6, line 17 of the same, amend "to erect." to "to establish." 5. Correct “next” to “next,” in the third line of page 7. 6. Add "in the processing process" next to "conventional" on page 13, line 7. 7. Correct “Groove 28” on page 14, line 11, to “Groove 25”. 8. Same page 17, line 14, "perspective view also" is corrected to "perspective view or". Patent Applicant: Nippon Chemi-Con Co., Ltd. FI0.15 FIG, 16 Procedural Amendment Band (Catfish July 30, 1985 Commissioner of the Japan Patent Office Black 1) Akio Tono 1.1 Timber Cattle 1 Shishakuro Ken 1961 Patent Application No. No. 295027 No. 2, Name of the invention: Core for magnetic head and its core piece, and its processing method 3, yH series with Hanyu who makes the correction Patent applicant address: 1 name, 167 Higashi-Ome-chome, Ome-shi, Tokyo
Nippon Chemi-Con Co., Ltd., Mr. Hiroshi Watabiki 4, Agent (1) The drawing dated January 20, 1986 is in the procedural amendment submitted. 6. Correction details FIG. 15 FIG. 16

Claims (3)

[Claims] (1) Consisting of two sets of side core and center core laminate pieces, holes forming a read/write section are aligned along the joint end surface of one side core and center core laminate piece, and the other side core and center core laminate piece are aligned. The holes that form the erased portion are aligned along the joint end faces of the side cores and the center core laminate pieces are bonded and fixed via glass material to the joint parts, and then these center core laminate pieces are laminated and bonded to form a core block. This core block is sliced to a predetermined thickness to form core pieces each having the same structure, and sliders are bonded and fixed to both sides of the upper end portion of the core piece in which the holes are provided. In the processing method, each hole is provided in a joined body of two sets of side core and center core laminate pieces in which a hole forming a reading/writing part and a hole forming an erasing part are aligned along the joint end surface. A certain groove is machined on the end face at a predetermined interval, and then each center core laminated piece of these joined bodies is laminated and bonded via a spacer while positioning the groove, and glass is simultaneously formed in each hole, groove, and joint part. Filling is performed to form a core block, and this core block is sliced at a predetermined position within the glass-filled groove to form a core piece having a step portion covered with a glass material on both sides of the upper end, and further, these core pieces are A method of processing a core for a magnetic head, characterized by bonding a pair of sliders to glass by thermally diffusing the glass material coated on each step. (2) Consisting of two sets of side core and center core laminate pieces, the holes forming the read/write section are aligned along the joint end surface of one side core and center core laminate piece, and the other side core and center core laminate piece are aligned. The holes forming the erased portion are aligned along the joint end surfaces of the side cores and the center core laminate pieces are bonded to the joint part through a glass material, and then these center core laminate pieces are laminated and bonded to form a core block. In a core piece for a magnetic head core made by slicing this core block to a predetermined thickness, a predetermined interval is preset on the end face provided in each hole for the joined body of two sets of side core and center core laminated pieces. A core block is constructed by providing grooves, positioning these grooves, stacking them together via spacers, and simultaneously filling the holes, grooves, and joints with glass. 1. A core piece for a magnetic head core, characterized in that the core piece is formed by slicing at a predetermined position and having a stepped part covered with a glass material on both sides of the upper end. (3) Side cores to which coils are attached are bonded and fixed to both sides of the center core that is laminated and bonded, and a core piece is provided with holes for forming a read/write section and an erase section along the bonded end surface of these center cores and side cores, In this magnetic head core, in which a pair of sliders are bonded and fixed to both sides of the upper end of the core piece, the steps on both sides of the upper end of the core piece are grooved with predetermined dimensions and are coated with a glass material in advance. A core for a magnetic head characterized by comprising a structure in which a pair of sliders are bonded and fixed by thermally diffusing the glass material.