JPS61230609A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To improve greatly the workability for production of a magnetic head by forming first gaps to a pair of rod-shaped cores equivalent to plural cores and then forming grooves to secure the prescribed track width. CONSTITUTION:The write/read cores 41 and 42, the erasion cores 43 and 44 and a nonmagnetic plate 45 having the length equivalent to plural heads are provided. Then the butting faces of these cores are polished and adhered together with the glass put between gap forming faces. Thus a write/read gap 46 and an erasion gap 47 are obtained. Then grooves 48 and 49 having prescribed width and pitch are formed to leave gaps at the prescribed positions with prescribed length. The nonmagnetic materials 50 and 51 are filled into grooves 48 and 49 for formation of a write/read head block and an erasion head block respectively. These two blocks are set so that a space part between two adjacent erasion gaps is put opposite to the write/read gap via the plate 45. Then both blocks are put together and cut into head elements.

Description

[Detailed description of the invention] Industrial applications The present invention records information on a floppy disk or the like.

Regarding the manufacturing method of magnetic heads used for reproduction
゛ −゛ Thing 2...
− is.

2. Description of the Related Art A laminated magnetic head conventionally used for floppy disks is constructed as shown in FIG.

In FIG. 4, 1 and 2 are cores forming magnetic circuits for writing and reading, 3 is a gap for writing and reading, and 4 is a non-magnetic material provided adjacent to core 2 to prevent crosstalk. , the core 1°2 and the non-magnetic material 4 constitute the central layer. 5a.

6a, 5b, and eb are cores constituting an erasing magnetic circuit, and 7a and 7b are erasing gaps, respectively. 8a and 8b are non-magnetic bodies provided adjacent to the cores 6a and 6b, respectively, and the non-magnetic body 8a and the core 5a
, core 6a has one outer layer, non-magnetic material ab, core 6b
, the core 6b constitutes the other outer layer. A laminate type magnetic head is constructed by overlapping the central layer and the outer layer as shown in FIG. 4 so that the core of each layer faces only the nonmagnetic material of the other layer.

However, as the demand for high-density recording has increased in recent years, the size of the tracks has tended to become extremely small, and laminated magnetic heads have had problems in terms of manufacturing yield and reduced efficiency.

As a means to solve these problems, a bulk type magnetic head shown in FIG. 6 has been proposed.

In FIG. 5, 11 and 12 are cores forming a magnetic circuit for writing and reading, and 13 is a gap for writing and reading. Reference numeral 14 denotes a non-magnetic material filled in a groove provided to regulate the writing and reading tracks. 16 and 16 are cores forming a magnetic circuit for erasing, and 17 is a gap for erasing. Reference numeral 18 denotes a non-magnetic material filled in a groove formed to regulate the inside of the erase track. Both magnetic circuits are joined via a non-magnetic material 19 so that erase tracks are formed on both sides of write and read tracks.

20 is a magnetic material that connects the core 11 and the rear end of 120; 21;
is a magnetic body that connects the rear ends of the cores 16 and 16, and a non-magnetic body 22 is provided between the magnetic bodies 20 and 21.

A conventional method for manufacturing such a bulk type magnetic head will be explained with reference to FIG. First, grooves are formed in the cores 11 and 12, leaving a portion having d] corresponding to a predetermined track, and the grooves are filled with the nonmagnetic material 14. Next, the core 11 is processed to have a C-shaped cross section, and then positioned so that the gap forming surfaces of both cores 11 and 12 accurately face each other, and then integrated to form the gear knob 13. Next, write and read head elements are made by cutting this along the a-line.

Next, the erasing head elements are made in the same process, and each head element is accurately positioned so that the writing/reading gap and the erasing gap are in the predetermined positional relationship, and then connected through the non-magnetic material 19. The magnetic head shown in FIG. 2 is constructed by bonding non-magnetic materials 2o and 21 to the rear end of each core with non-magnetic material 22 interposed therebetween.

Problems to be Solved by the Invention In such a conventional manufacturing method, it is necessary to perform mid-track processing on each of the four cores, and when forming each gap, it is necessary to accurately align the gap forming surfaces so that they do not shift. This increases the number of machining steps and requires troublesome positioning to maintain accuracy.
There was a problem that mass production was lacking.

Means for Solving the Problems According to the present invention, gears are first formed on a pair of rod-shaped cores for a plurality of cores, and then grooves are formed to fit within a predetermined track.

Effect: The effect of this technical means is that the process of forming the groove and filling the groove with the non-magnetic material only needs to be carried out twice, and furthermore, the precision of positioning the cores when forming the gap is not required.

EXAMPLE An example of the manufacturing method of the present invention will be described below with reference to FIG. First, as shown in al.
1, 42, prepare the erasing cores 43, 44 and a non-magnetic plate 45 for insulating both magnetic circuits, and after polishing the working surfaces of each core to a mirror finish, as shown in FIG. A write/read gap 46 and an erase gap 47 are formed by bonding with glass interposed.

Next, as shown in tc+ in the same figure, grooves 48 and 49 having a predetermined width and pitch are respectively formed to leave a gap at a predetermined position and a predetermined length.

In this case, an inclined groove is formed such that the bottom surface of the tank 48, 49 passes below the lowest end of the gap forming surface of each core.

Next, as shown in FIG. fdl, the grooves 48 and 49 are filled with nonmagnetic materials 50 and 51, respectively, to form a write/read head block and an erase head block.

Next, as shown in FIG. 8 (8), both hend blocks are positioned and joined via the non-magnetic plate 46 to the gap between the two erasing gaps in phase so that the writing and reading gaps face each other. , by cutting along plane A in the figure,
A head element as shown in fl can be obtained.

Furthermore, slicing and wrapping are performed so that the width of the sliding motion with the recording medium becomes a predetermined dimension.

Furthermore, magnetic bodies 62 and 53 are coupled to the rear ends of the cores 41, 42 and 43, 44 with a non-magnetic material 54 interposed between them, and windings 55 and 56 are applied, as shown in FIG. The magnetic head is completed.

In the above embodiments, when forming the groove for track width machining, the bottom surface of the groove was made to pass below the lowest end of the gap forming surface so that the entire gear forming surface was removed. As shown in the figure, the bottom surface of this groove may be made to pass above the lowest end 57 of the gap forming surface, so that the lower end 58 of the gap forming surface remains.

Effects of the Invention The present invention includes a step of forming a gap in advance by combining a plurality of writing, reading cores, and erasing cores, a step of applying track width processing to each of them, and a step of aligning both head plotters with the positional relationship of the gap forming surfaces. This process involves the process of bonding through a non-magnetic material so that a predetermined relationship is established, and the process of obtaining one head element by cutting at a predetermined position, so track width processing can be done only twice. This not only greatly simplifies the groove machining and non-magnetic material filling processes, but also because the track width machining is performed after the gap has been formed in advance, so the gap can be made by butting together the track width machining processes. There is no possibility of misalignment occurring during abutting, which is the case with conventional forming methods. In other words, in the conventional method, there is a risk of positional deviation occurring in three processes: writing and reading gaps, forming erase gaps, and re-bonding the head element, and it is necessary to perform highly accurate positioning in each process. However, with the method of the present invention, highly accurate positioning is only required when joining the write/read head block and the erase head block, which significantly improves work efficiency and yield, making it suitable for mass production. Accordingly, it is possible to provide a manufacturing method.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a manufacturing method according to an embodiment of the present invention; FIGS. 2 and 3 are perspective views showing an example of a magnetic head manufactured by the method of the present invention; Figures (-) are exploded perspective views of a conventional magnetic head, (Bl is a plan view of the same, Figure 5 is a perspective view of a conventional bulk type magnetic head, and Figure 6 shows a conventional bulk type magnetic head manufacturing method. It is a perspective view showing 41.42.43., 44... core, 46.4
7... Gear knob, 50.51... Non-magnetic material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig.

Claims (1)

[Claims] combining core blocks each having a length for a plurality of heads to form a write/read head block and an erase head block each having a gap;
A process of cutting grooves with a predetermined pitch and a predetermined width on each head block to obtain the track width, and writing on both head blocks, and inserting a non-magnetic plate so that the erase gap faces the missing part of the read gap. 1. A method for manufacturing a magnetic head, comprising: a step of joining the head block through the head block; and a step of cutting the joined head block to obtain individual head elements.