JPS63269311A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head suitable for mass production and resulting recording with high density, by forming plural grooves in a direction from an almost I shape core side toward an almost C shape core in a state where the almost I shape core and the almost C shape core are bonded. CONSTITUTION:The almost C shape core 15 for read/write, the almost I shape core 16 for read/write, a C shape core 17 for erasure, and an I shape core 18 for erasure are joined with glass 14 of high m.p., then, core blocks 21 and 22 having magnetic gap 19 and 20 are formed. On the core block 21, plural grooves 25 are formed so as to form gap forming planes 29 having tracks for read/write are formed, and on the core block 22, plural grooves 27 are formed so as to form the gap forming planes 31. Next, positioning is performed so that the center line of the gap forming planes 31 can be aligned to that of the gap forming planes 29. In such a way, it is possible to improve the size accuracy of each track width, and to improve the size accuracy by positioning the grooves with each other easily, and to improve working efficiency.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of manufacturing a magnetic head, and in particular, as shown in FIG.
and an erase gap that has a track width wider than that gap, and the erase gap has a track width L that is wider than the track width L2 of the read/write gap.
The present invention relates to a method for manufacturing a magnetic head of a pre-erase type in which data is written in a predetermined track width using a read/write gap after erasing in step 1.

[Prior art and problems to be solved by the invention]
As shown in FIG. 4, this type of magnetic head has a C-shaped core 2 for reading/writing, an I-shaped core 1 for reading/writing, a C-shaped core 3 for erasing, and an I-shaped core 4 for erasing. After cutting grooves by grinding or the like so as to form a gap width of , the respective cores are glass bonded with high melting point glass 8 to form a read/write chip core 9 having a read/write gap 5 and an erase chip core 9. After forming an erase chip core 10 having a gap 6, the cores 9 and 10 are bonded with a low melting point glass 11 made of a non-magnetic material with a gap of several tens of micrometers in between.

However, in this type of magnetic head, it is difficult to process grooves in exactly the same way on the ■-shaped core and the C-shaped core, and furthermore, when joining these two cores together, it is difficult to process the grooves with precision. It was necessary to select a ■-shaped core and a C-shaped core that matched each other, and to precisely align the C-shaped core and I-shaped core before joining. In addition, misalignment is likely to occur due to minute changes in posture during bonding, resulting in lower manufacturing yields.

Furthermore, the dimension L between the erase gap 6 and the read/write gap 5 (so-called gap-gap dimension) is currently strictly required to be 200 μm in order to achieve high-density recording. Therefore, the thickness of the (1) shaped core is 100 μm or less, and the (1) shaped core cannot be easily produced by machining as it may be destroyed, resulting in a high part cost.In addition, the read/write chip core 9 and erase chip core 10
When positioning the chip cores, the efficiency of the positioning work is poor because they are thin, and it is very difficult to position the chip cores so as to minimize the relative positional deviation between the 9° and 100°.
It has been difficult to improve positioning accuracy.

[Object of the Invention] An object of the present invention is to provide a method for manufacturing a magnetic head that solves the drawbacks of the prior art and can manufacture a magnetic head that is suitable for commercialization, is capable of high-density recording, and is highly accurate.

[Means and effects for solving the problem] According to the present invention, a read/write gap forming surface is formed on one core block consisting of a substantially C-shaped core and a substantially C-shaped core. At the same time, a groove is formed on the other core block so as to form an erase gap forming surface having a wider track width than the read/write gap forming surface, and then a predetermined gap is left between both core blocks: :°
, 7 to 7 nails τ in z measure>-, there J cheek τ A method for bonding both core blocks by filling the groove and the gap with a non-magnetic material at the same time is provided.

[Example 7] The details will be explained below with reference to the process diagram of FIG. 3 showing an example embodying the present invention.

First, as shown in FIG. 3(a) and (A>), Mn-7n
A roughly C-shaped core for read/write (hereinafter referred to as C-core for R/W) 15 and a roughly ■-shaped core for read/write (hereinafter referred to as I-core for R/W) 16 made of a ferromagnetic material such as ferrite. A roughly C-shaped core for erase (hereinafter referred to as C-core for ER) 17 and a roughly I-shaped core for erase (hereinafter referred to as I-core for ER) 18 are respectively bonded with high melting point glass 14, and a desired magnetic gap core is formed. A core block 21,22 having 9,20 is formed.

Next, as shown in FIGS. 3(b) and 3(B), the R/W I
Either the core 16 or the ER I core 18,
Processing is performed such that protrusions 24 are formed at both ends of the core by machining such as grinding.

In the later-described process of bonding thin plates such as helmet 5: 5 knee Lz writhing τ゛: 5 knife to core block 21.22, the protrusion 24 between both core blocks 21.22 is attached. Of course, it may be interposed at a position opposite to .

Next, as shown in FIG.
A plurality of grooves 25.27 are formed leading to the core 15.17. A plurality of pairs of grooves 25 are formed on the read/write core block side 21 so as to form a read/write gap forming surface 29 having a read/write write track width L2 shown in FIG. Further, for the erase core block 22 side, as shown in FIG. 5, the read/write write track width (track width L in FIG.
A plurality of pairs of grooves 27 are formed so as to form an erase gap forming surface 31 having a track width L1 wider than 2>.

Each of the grooves 25 and 27 was formed diagonally in order to reduce the wear of the grooving grindstone and to improve the magnetic properties, but the grooves were formed horizontally or vertically on the upper surface of the core block 21 and 22. Of course, it is possible.

Next, as shown in FIG. 3(d) and FIG. 2, the center line of the erase gap forming surface 31 is aligned with the center line of the read/write gap forming surface 29, and instant bonding is performed. Temporary fixation is performed using a chemical agent, etc. Furthermore, at this time, both I
Since the groove is processed to the edge of the core 16.18,
Both core blocks 21 and 22 can be easily aligned.

Thereafter, a low melting point glass rod 33 made of a non-magnetic material is placed in the center of both integrated core blocks 21 and 22 as shown in FIG. 3(e), and the I cores 16.
18 and the protrusion 24, and each groove 25, 27 is heat treated so that it is filled with glass.

Next, as shown by the hatching in FIG. 3(f), the grooves 25° 27 on both sides of the respective gap forming surfaces 29, 31 are cut to the cutting line 37 using a grindstone (not shown). A plurality of chip cores are formed by forming the core blocks 21 and 22 into a comb-like shape, leaving the bottom portions intact, and then cutting the bottom portions along cutting lines 37. A magnetic helad can be formed by attaching a coil winding and, if necessary, a back bar (not shown) to the chip core thus formed.

[Effects of the Invention] As detailed above, the present invention forms a plurality of grooves from the substantially C-shaped core side toward the substantially C-shaped core with the substantially I-shaped core and the substantially C-shaped core bonded together. , the dimensional accuracy of each track width has been improved, and since groove processing is performed with the substantially I-shaped core reinforced, damage to the substantially I-shaped core can be prevented; is formed on both core blocks, the read/write core block and the erase core block are placed with their approximately C-shaped cores facing each other, and the gaps and trapezoids of both core blocks are filled with non-magnetic material. Since the core block is bonded, it is possible to easily align the grooves, that is, align the read/write gap forming surface and the erase gap forming surface, thereby improving dimensional accuracy. In addition, the process of filling the trapezoid with a non-magnetic material and the process of bonding both core blocks together can be performed simultaneously, which has the effect of improving work efficiency.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment embodying the present invention; Figure 1 is a perspective view of a magnetic head, Figure 2 is a plan view of a core block, and Figure 3 shows a working process. Explanatory diagram, 4th
The figure is a perspective view showing a conventional magnetic head, and Figure 5 shows a lead
FIG. 3 is an explanatory diagram showing the relationship between a write gap and an erase gap. In the figure, 15 is a roughly C-shaped core for reading/writing, 16 is an I-shaped core for reading/writing, 17 is a roughly C-shaped core for erasing, 18 is an I-shaped core for erasing, 19.20 is a magnetic gap, 21. 22 is the core block, 25.27
29 is a groove, 29 is a read/write gap forming surface, and 31 is an erase gap forming surface.

Claims (1)

[Claims] 1. A substantially C-shaped core (15
, 17) and substantially I-shaped cores (16, 18) to form a core block (21, 22) such that a desired magnetic gap (19, 20) is formed; (21, 22) from the approximately I-shaped core (16) to the approximately C-shaped core (15) so that a plurality of read/write gap forming surfaces (29) having a predetermined track width are formed. forming a plurality of erase gap forming surfaces (31) having a track width wider than the predetermined track width on the other one of the core blocks (21, 22); ) forming a plurality of grooves (27) from the approximately I-shaped core (18) to the approximately C-shaped core (17), and a step for reading/writing the one core block (21). The center of the gap forming surface (29) and the center of the erasing gap forming surface (31) of the other core block (22) are aligned, and a predetermined gap is left between both core blocks (21, 22). positioning both core blocks (21, 22), filling the gap and each groove (25, 27) with a non-magnetic material at the same time, and positioning both core blocks (21, 22).
2), and grooves (25) on both sides of both gap forming surfaces (29, 31).
, 27) to form a chip core by cutting the core block (21, 22) so as to pass through the core block (21, 22).