JP2664143B2 - Processing method of core for magnetic head - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for performing magnetic recording and reproduction, and more particularly to a magnetic head in which a core constituting the magnetic head has improved mechanical strength, heat resistance, and moisture resistance. The present invention relates to a method of processing a core for use. 2. Description of the Related Art Conventionally, as a method of processing a core in the case of manufacturing a magnetic head used for a floppy disk or the like, as a method of processing a core to a predetermined size, a glass is formed in a hole for forming a magnetic read / write portion and an erase portion. The filled center core and side core are joined 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, and an organic adhesive or the like is used for each of the obtained core pieces. Then, a pair of sliders is fixed to each other to form a core unit. 11 to 18 show the processing steps of the above-mentioned conventional magnetic head core. In FIG. 11, reference numerals 10 and 12 denote a side core and a center core, respectively, made of a magnetic material, and a magnetic read / write as shown in FIGS. 11 (a) and 11 (b) respectively on the joint surface of the side core 10 and the center core 12. Track groove for forming writing part
14a and 14b are formed at a predetermined pitch. Next, the side core 10 and the center core 12 are filled with glass as shown in FIGS. 12 (a) and 12 (b), respectively.
Thereafter, a lapping process is performed to remove excess glass material, adjust dimensions, and mirror-finish the bonding surface, as shown in FIGS. 13 (a) and 13 (b). As shown in FIG. 14, the side core 10 and the center core 12 configured as described above are respectively inserted into the track grooves 14a.
And 14b are combined so that the quartz film and the glass are thermally diffused between the joining surfaces, whereby the side core 10 and the center core 12 are joined and fixed to form a predetermined gap, and a magnetic read / write is performed on the upper surface. A magnetic read / write section side core block 16 having a hole 14 forming a section is formed. Further, in the same manner as in the above-described processing step, a magnetic eraser side core block 22 including the side core 18 and the center core 20 as shown in FIG. 15 is formed, and a hole 24 for forming a magnetic eraser is provided on the upper surface. Further, the magnetic read / write section side core block 16 and the magnetic erase section side core block 22 are glass-bonded to the center cores 12 and 20 via glass thin plates 26, respectively, to form a fixed core block 28 in which the center cores are laminated. Configure. Next, the core block 28 is sliced into a predetermined shape by a slicing machine or the like to obtain a core piece 30 as shown in FIG. 17, and both sliced surfaces of the core piece 30 are polished with high precision to obtain the entire core thickness. Perform dimension processing,
A bulk type magnetic read / write portion and erase portion are appropriately formed on the upper surface. Further, as shown in FIG. 18, sliders 32 and 34 are respectively bonded and fixed to the upper portions of both sides of the core piece 30 with high precision by an organic adhesive to form a core unit 36. A required magnetic head can be formed by appropriately mounting a coil, a rear core piece, and the like (not shown) to the core unit 36. [Problems to be Solved by the Invention] In the above-mentioned conventional method for processing a core for a magnetic head, when bonding the core piece and the slider, an organic adhesive made of epoxy resin or the like is generally used. However, a core structure using an organic adhesive does not provide sufficient mechanical strength, heat resistance, and moisture resistance, and has a problem in that the bonding surface is displaced during long-term use, resulting in unstable operation characteristics. In addition, as a conventional inorganic bonding technique, a method using a PbO-based glass sputtered film is known, but there is a problem that a processing step is complicated and a manufacturing cost is increased. Therefore, an object of the present invention is to provide a method for processing a magnetic head core that can easily and reliably bond a glass to a core piece and a slider, has good workability, and has excellent durability and stability of operation characteristics. To provide. [Means for Solving the Problems] The method of processing a core for a magnetic head according to the present invention comprises the steps of laminating pieces (10, 12 and 1) with two sets of side cores and a center core.
8,20), when joining the laminated pieces of the side core and the center core, a given processing groove is formed on the joined body at a predetermined interval, and then the joined body is filled with glass to form a core block ( 28), the core block is sliced to a predetermined thickness at a predetermined position in the glass-filled groove, and has a core portion (30) of the same structure having a step covered with a glass material on both sides at the upper end. In a method of processing a core for a magnetic head, a pair of sliders (32, 34) are bonded to a glass by thermally diffusing the glass material respectively coated on the steps of the core pieces. The track grooves (14a, 14b) forming read / write portions are aligned and arranged along the joint end faces of the laminated pieces (10, 12) of one side core and the center core. Track grooves (14a, 14b) forming erased portions are respectively arranged along the joining end faces of the laminated pieces (18, 20) of the side core and the center core, and the laminated pieces (10, 12 and 1
8 and 20) are aligned with the respective track grooves (14a and 14b) and bonded and fixed, and a read / write section side core block (16) provided with holes (14 and 24) for forming gaps respectively. Forming an erasing section side core block (22), and forming a groove (25) on the upper surface of the core block (16, 22) at a position corresponding to the hole (14, 24). After the installation, the respective core blocks are positioned while positioning the respective groove portions (25) with each other, and the spacers (3) each having a cavity for injecting molten glass therein.
8), and a glass plate (40) is placed on the upper surface of the temporarily joined core block and melted, and the respective holes (14, 2) are melted.
4), the cavity of the groove (25) and the cavity of the spacer (38) are simultaneously and simultaneously filled with glass to form a glass-bonded core block (28), and the core block (28) is sliced. A slider (32, 34) is glass-bonded to the obtained core piece (30) to form a core unit (36), and a coil and a rear core piece are mounted on the core unit (36). [Operation] According to the magnetic head processing method of the present invention,
Before slicing the core block to form a core piece, a groove of a predetermined size is formed in advance on the upper end on the side where the slider is to be mounted, and each groove is filled with a glass material, and then a predetermined position in the glass-filled groove is formed. The core block is sliced to form a core piece, and as a result, a step portion coated with a glass material is formed at the upper end of both sides of the core piece, and the glass material coated on the step portion is easily diffused by heat. Can be bonded to the slider. In particular, according to the present invention, when processing the core block,
Forming a read / write section side core block and an erase section side core block each having a hole for forming a gap by aligning and fixing the respective track grooves to the laminated pieces of the side core and the center core, respectively; After the grooves are cut in the upper surface of these core blocks in the positional relationship with the holes, the respective core blocks are positioned while positioning the respective grooves, and the spacer having a cavity for injecting molten glass therein. And a glass plate is disposed on the upper surface of the temporarily bonded core block and melted to collectively cover the holes, the grooves and the cavities of the spacers. At the same time, glass filling is performed to complete the glass-bonded core block at a time. Step is at once, the processing steps can be simplified, the joint fixing of the results positioning accurate core blocks can be achieved stably and reliably. Embodiment Next, an embodiment of a method of processing a core for a magnetic head according to the present invention will be described in detail below with reference to the accompanying drawings showing a typical processing method. 1 to 10 show an embodiment of a processing step of a magnetic head core according to the present invention. In this embodiment, for convenience of explanation, the same components as those of the magnetic head core in the conventional processing steps shown in FIGS. 11 to 18 will be described using the same reference numerals. In FIG. 1, reference numerals 10 and 12 denote a side core and a center core, respectively. The point that track grooves 14a and 14b are formed in these side cores 10 and the center core 12 at predetermined intervals is the same as the conventional one shown in FIG. This is the same as the magnetic head core. Therefore, in the present embodiment, as shown in FIG. 2, the side core 10 and the center core 20 are bonded and fixed to each other before glass filling, and a gap is formed, so that the magnetic read / write unit side core block is formed.
Make up 16. Therefore, a hollow hole 14 is formed on the upper surface of the magnetic read / write unit side core block 16.
Further, as shown in FIG. 3, the upper portion which will be a core piece 30 described later is cut into a groove shape by a predetermined distance in accordance with the positional relationship of the holes 14 provided on the upper surface of the core block 16 on the magnetic read / write section side. Each of these grooves 25 is subjected to full thickness processing. Also, in the same manner as in the above-described processing,
A magnetic eraser-side core block 22 composed of the core 18 and the center core 20 is formed, a hole 24 for forming a magnetic eraser is formed on the upper surface, and a groove 25 is cut out (see FIG. 4). Next, as shown in FIG. 5, the magnetic read / write section side core block 16 and the magnetic erase section side core block 22 were temporarily joined to their joint surfaces via spacers 38 to form an upper portion. The core block 28 is formed by appropriately positioning each groove 25. Here, the spacer 38
Has a hollow structure for injecting molten glass inside,
It is configured so that unnecessary portions can be properly removed at the time of cutting the core piece. Next, as shown in FIG. 6, a glass plate 40 is disposed on the uneven portion on the upper surface of the core block 28, and the glass plate 40 is melted, and as shown in FIG. The holes formed on the upper surface, the holes 14 and 24 forming the magnetic read / write portion and the erase portion, the groove 25, and the internal cavity of the spacer 38 are simultaneously and simultaneously filled with glass, and the magnetic read / write is performed. The joint between the unit side core block 16 and the magnetic erase unit side core block 22 is bonded by glass. In other words, in the present invention, the glass filling step, which has been conventionally performed individually for each of the holes and the grooves of the core block, can be simplified once, thereby simplifying the processing steps. Further, the core block 28 is sliced at a predetermined position in each of the glass-filled grooves as shown in FIG. 8, and as shown in FIG. The core piece 30 has a step for mounting a slider, which is appropriately formed and has a glass coating 40a, 40b on the upper surface of each side. As shown in FIG. 10, the core unit 30 forms the core unit 36 by thermally bonding the glass coatings 40a and 40b of the respective slider mounting portions to bond the sliders 32 and 34 to the glass, respectively. By mounting a coil, a rear core piece, and the like (not shown) to the core unit 36, a required magnetic head can be formed. [Effects of the Invention] As is clear from the above-described embodiments, according to the present invention, when processing a core unit from a core block,
The groove provided on the upper surface of the core block is preliminarily filled with glass, and the core block is sliced in the groove filled with glass to form a core piece having a glass-coated step on the upper surface on both side surfaces. By thermally diffusing the glass-coated portion, the slider can be easily and reliably bonded to the glass, and a magnetic head core having excellent mechanical strength, heat resistance and moisture resistance can be obtained. In particular, according to the present invention, when processing the core block,
Forming a read / write unit side core block and an erase unit side core block each having a hole for forming a gap by joining and fixing the laminated pieces of the side core and the center core by aligning the respective track grooves, and forming respective gaps; After the grooves are cut in the upper surface of these core blocks in the positional relationship with the holes, the respective core blocks are positioned while positioning the respective grooves, and the spacer having a cavity for injecting molten glass therein. And a glass plate is disposed on the upper surface of the temporarily bonded core block and melted to collectively cover the holes, the grooves and the cavities of the spacers. At the same time, glass filling is performed to complete the glass-bonded core block at a time. The machining process can be simplified by a single process.As a result, the core block with high positioning accuracy can be stably and reliably fixed, and the rear core piece mounting surface is mirror-finished only in the necessary parts. As a result, the mirror finished area can be reduced, the quality of this type of magnetic head core can be improved, and the manufacturing time and manufacturing cost can be significantly reduced. The preferred embodiment of the present invention has been described above. However, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 10 are perspective views or top views of a magnetic head core according to an embodiment of the present invention, showing one embodiment of a processing step of the core. FIGS. FIG. 4 is a perspective view of each of the cores, illustrating a processing step of the magnetic head core of FIG. 10, 18 Side core, 12, 20 Center core 14, 24 Hole, 16, 22, 28 Core block 25 Groove 26 Glass plate 30 Core piece 32, 34 Slider 36: Core unit, 38: Spacer 40: Glass plate, 40a, 40b: Glass coating

Claims (1)

(57) [Claims] 1.2 Laminated pieces (1 set of side core and center core)
0,12 and 18,20), and when joining these laminated pieces of the side core and the center core, a predetermined processing groove is formed on the joined body at a predetermined interval, and then the joined body is filled with glass. To form a core block (28), and the core block is sliced to a predetermined thickness at a predetermined position in the glass-filled groove, and has a step portion coated with a glass material on both sides at an upper end portion. A method for processing a core for a magnetic head, comprising forming a core piece (30), and further thermally diffusing a glass material coated on each step of the core piece and bonding a pair of sliders (32, 34) to the glass. When processing the block, read / read along the joining end face of the laminated piece (10, 12) of one side core and center core.
The track grooves (14a, 14b) for forming the writing portion are aligned and arranged, and the track grooves (14a, 14b) for forming the erasing portion along the joining end face of the laminated piece (18, 20) of the other side core and the center core. ) Are aligned, and the laminated pieces (10, 12, and 18,
The holes (1) are formed by aligning the track grooves (14a, 14b) with each other and joining and fixing them to form gaps.
A read / write unit-side core block (16) and an erase unit-side core block (22) provided with the respective holes (4, 24) are formed on the upper surface of these core blocks (16, 22). 14 and 24), after cutting grooves (25) at positions corresponding to each of the core blocks, while pouring the molten glass into the core blocks while positioning the grooves (25). Spacer with cavity (38)
Then, a glass plate (40) is arranged on the upper surface of the temporarily joined core block, and the glass plate (40) is melted.
4), the cavity of the groove (25) and the cavity of the spacer (38) are simultaneously and simultaneously filled with glass to form a glass-bonded core block (28), and the core block (28) is sliced. A magnetic head characterized in that a slider (32, 34) is glass-bonded to the obtained core piece (30) to form a core unit (36), and a coil and a rear core piece are mounted on the core unit (36). Method of processing core.