JPH01173305A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To grind the traveling surface of a tape so that gap depth can be uniformized by forming a prescribed fitting part in a magnetic head block, inserting a positioning stick into this engaging part and positioning the block to a jig. CONSTITUTION:In an internal coiling channel 12 of one block 14, a channel 20 in a rectangular shape is engraved and provided as the fitting part by cutting a glass which is separated from a lower edge position C of a gap 24 by a prescribed interval X. When tape traveling surfaces 22 and 23 are ground in a curved surface shape, a stick member 27 for positioning, whose cross section is a rectangular shape, is inserted into respective channels 20 of plural head blocks 21... and in such a condition, the stick member 27 is fixed to a jig 28 and the positioning is executed. As the result, since intervals between the inside edge of the gap 24 of the respective blocks 21 and the reference position of the jig 28 are uniformized, the tape traveling surfaces 22 and 23 can be ground in the curved surface so that the gap depth of the respective blocks can be uniformized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic head used in a rotary head drum of a video tape recorder or the like.

[Conventional technology]

Conventionally, when polishing the tape running surface of a magnetic head block into a curved surface, as shown in FIG. Then, in this state, the tape running surface 1a, which is the upper surface of each magnetic head block 1, was polished. After polishing, the magnetic head block 1 is divided into a plurality of parts along a plane perpendicular to the elongated direction.
A plurality of magnetic heads can be obtained from each magnetic head block 1.

[Problem that the invention seeks to solve]

By the way, each magnetic head block 1 is constructed by joining two blocks arranged side by side in the horizontal direction (only one block is shown in FIG. 14).
, When two blocks are joined, the bottom surfaces of the two blocks may be shifted, so when a plurality of magnetic head blocks 1 are bonded to the jig 2, the reference position of each magnetic head block 1, specifically is formed between the two blocks, and the distance between the lower end position A of the gap (not shown) whose upper end is exposed to the tape running surface 1a, 1a, etc. and the reference position B of the jig 2 is constant. As a result, even if the tape running surfaces 1a, 1a, etc. are polished so that the depth of the gap between each magnetic head block 1 becomes a predetermined value, in reality, the gap between each magnetic head block 1 is The problem was that the depths of the holes were uneven.

Further, according to the above polishing method, each magnetic head block 1
is attached to the jig 2, each magnetic head block 1
Since the lower end of the gap cannot be seen, it is difficult to adjust the depth of the gap.

[Means for solving problems]

In order to solve the above-mentioned problems, the method for manufacturing a magnetic head according to the present invention has two blocks made of magnetic material, one in which the outer end is exposed to the tape running surface, and the other in the inner end of the gap. A method for manufacturing a magnetic head, comprising the steps of: positioning a plurality of magnetic head blocks joined to each other through a continuous window with respect to a jig; and polishing the tape running surface of each magnetic head block in this state. In this method, a fitting part is formed in the window part of each magnetic head block at a predetermined distance from the inner end of the gap, and when polishing the tape running surface of each magnetic head block, a fitting part is formed in the window part of each magnetic head block. The present invention is characterized in that each magnetic head block is positioned with respect to the jig by fitting a common positioning rod member into the fitting portion.

[For production]

According to the above configuration, since the distance between the fitting part of each magnetic head block and the inner end of the gap is constant, the positioning rod member is fitted to the fitting part of each magnetic head block. The distance between the reference position of the positioning rod member and the inner end of the gap of each magnetic head block is constant. Therefore, if the distance between the reference position of the positioning rod member and the reference position of the jig is kept constant, the distance between the inner end of the gap of each magnetic head block and the reference position of the jig will be the same. Become. This makes it easy to polish the tape running surface of each magnetic head block so that the gap depths of the magnetic head blocks are uniform.

Furthermore, when polishing the tape running surface of each magnetic head block, the position of the inner end of the gap in each magnetic head block can be determined based on the reference position of the positioning rod member, making it easy to adjust the depth of the gap. Be able to do it.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 13.

When manufacturing a magnetic head, first, an external winding groove 11 as shown in FIG. 5 is carved in a magnetic material 10 such as ferrite as shown in FIG. As shown in FIG. 6(a), an internal winding groove 12 as a window portion having a trapezoidal cross section with an inclined surface 12a formed on one side is carved on the surface opposite to the external winding groove 11, Remaining magnetic material 1
As shown in FIG. 6(b), two types of blocks 14 and 15 are formed by carving reinforcing grooves 13 having a rectangular cross section on the surface opposite to the external winding groove 11.

Next, as shown in FIGS. 7(a) and 7(b), a plurality of track grooves 1 are formed at corresponding positions of each block 14 and 15.
6, 16..., 17, 17... are provided at a predetermined interval, and then the track grooves 16, 16... Reinforcement grooves 13 in the inner and inner winding grooves 12 and in the block 15
Inside and track grooves 17, 17... are filled with molten glass 18, 18, respectively, and further, blocks 14, 15 are filled.
The excess glass 18 overflowing onto the top surface of the glass 18 is removed by grinding (FIGS. 9(a) and (b)).

Continuing on, FIG. 10(a) and its partially enlarged view 1
As shown in FIG. 0(b), the upper end position of the inclined surface 12a in the internal winding groove 12 of one plot 14, in other words, the position of the upper end of the inclined surface 12a, which will be described later and will be formed when the two blocks 14 and 15 are joined later. The glass 18 after a position separated by a predetermined distance X from the lower end position C as the inner end of the gap 24
is removed by cutting or the like, and furthermore, a groove 2o having a rectangular cross section as a fitting portion is carved at a position spaced apart from the lower end position C of the gap 24 by a distance X in the block 14.

After that, as shown in FIG.
・I5 to trunk 116-16-... and 17-17...
- A magnetic head block 21 is obtained in which the blocks 14 and 15 are integrated by joining and fixing them so that they face each other, melting the glass 18 with heat, and welding the blocks 14 and 15. At this time, as shown in FIG. 1(a), between the block 14 and the block 15, the upper end as the outer end is the tape running surface 22 of each block 14, 15.
A gap 24 is formed which is exposed to the gap 23 and whose lower end is the upper end of the inclined surface 12a of the internal winding groove 12.

Next, as shown in FIG. 12, a plurality of magnetic head blocks 21, 21, etc. are attached to the jig 25, and the polishing blade is moved while swinging the jig 25 about its reference position 25a. 26 is sequentially brought into contact with the tape running surfaces 22 and 23 of each magnetic head block 21, thereby polishing each tape running surface 22 and 23 into a curved shape.

Next, each magnetic head block 21 is removed from the jig 25, and as shown in FIG. 1(a), FIG. 2, and FIG. By fitting the positioning rod member 27 having a rectangular cross section into a portion corresponding to the groove 20 in each internal winding groove 12 and fixing the positioning rod member 27 to the jig 28 in this state, each magnetic The head block 21 is positioned with respect to the jig 2B.

At this time, the upper surface 27 which becomes the reference surface of the positioning rod member 27
The distance between a and the lower end position C of the gap 24 of each magnetic head block 21 is a constant value X, and the distance Y between the upper surface 27a of the positioning rod member 27 and the reference position 28a of the jig 28 is also constant. Therefore, the distance between the lower end position C of the gap 24 of each magnetic head block 21 and the reference position 28a of the jig 28 is constant.

Therefore, by final polishing the tape running surfaces 22 and 23 of each magnetic head block 21 in this state, the depth of the gap 24 of each magnetic head block 21 can be easily maintained constant. Furthermore, during polishing work, the lower end position C of the gap 24 of each magnetic head block 21 can be indirectly determined based on the position of the upper surface 27a of the positioning rod member 27, so the depth of the gap 24 can also be adjusted. Can be done easily and accurately.

After polishing the tape running surfaces 22 and 23, the magnetic head block 21 is divided into a plurality of parts along a plane perpendicular to the elongated direction, so that a plurality of magnetic heads can be obtained from each magnetic head pro-7 21. These magnetic heads are provided with windings.

In addition, in the above manufacturing process, the magnetic hend block 2
The first positioning method can be modified in various ways.

For example, Fig. 13(a) and its partially enlarged view 1
As shown in FIG. 3(b), the glass 18 from a position a relatively short predetermined distance X' away from the lower end position C of the gap 24 in the internal winding groove 12 in the block 14 is removed to form the inclined surface 12a. As shown in FIG. 1(b), a positioning rod member 27' having a circular cross section is inserted into the internal winding groove 12 of each magnetic head block 21 during final polishing.
It is also possible to fit them together. In this case, internal winding groove 1
2 itself becomes a fitting part.

Furthermore, as shown in FIG. 1(C), the glass 18 in the internal winding groove 12 of the magnetic head block 21 is arranged on the inclined surface 12a.
Block 1 is removed to expose a part of it.
A predetermined distance X from the lower end position C of the gap 24 at 4
A groove 30 as a fitting portion may be provided at a position separated by a distance of 100 mm, and a positioning rod member 27'' having a rectangular cross section may be fitted only into this groove 30 during final polishing of the tape running surfaces 22 and 23. In this case, the glass 18 does not participate in the positioning of each magnetic head block 21, and the positioning is performed only by the groove 3°, so that the positioning of each magnetic head block 21 becomes even more accurate. [Effect] As described above, the method for manufacturing a magnetic head according to the present invention has the following effects:
A jig is equipped with a plurality of magnetic head blocks each made of two blocks made of magnetic material joined through a gap whose outer end is exposed to the tape running surface and a window extending to the inner end of this gap. In the method of manufacturing a magnetic head, the tape running surface of each magnetic head block is polished at a predetermined distance from the inner end of the gap within the window of each magnetic head block. When polishing the tape running surface of each magnetic head block, a common positioning rod member is fitted to the mating part of each magnetic head block to separate each magnetic head block. The configuration is such that positioning is performed with respect to the jig.

As a result, the distance between the fitting part of each magnetic head block and the inner end of the gap is constant, so when the positioning rod member is fitted to the fitting part of each magnetic head block, The distance between the reference position of the rod member and the inner end of the gap of each magnetic head block is constant. Therefore, if the distance between the reference position of the positioning rod member and the reference position of the jig is kept constant, the distance between the inner end of the gap of each magnetic head block and the reference position of the jig will be the same. Therefore, the tape running surface can be easily polished so that the gap depths of the magnetic head blocks are uniform.

Furthermore, since the position of the inner end of the gap of each magnetic head block can be determined based on the reference position of the positioning rod member, the depth of the gap can be easily and accurately adjusted.

[Brief explanation of the drawing]

1 to 13 show embodiments of the present invention, and FIGS. 1(a) to 13(C) each show a positioning rod member attached to a magnetic head block provided with various fitting parts. A partially enlarged front view showing the fitted state, Figure 2 is Figure 1 (a)
3 is a side view showing a positioning rod member fitted to the magnetic head block, and FIGS. 4 to 9 (a) and (b) are configurations of the magnetic head block. Showing the machining process of two types of blocks.
A perspective view, FIG. 10(a) is an enlarged perspective view showing a state in which a fitting part is formed on one block, and FIG. 10(b) is an enlarged perspective view of the 10th block.
11 is a perspective view showing a state in which two blocks are joined; FIG. 12 is a perspective view showing a polishing process for a magnetic head block formed by joining two blocks; FIG. 13 is a partially enlarged view of FIG. FIG. 13(a) is an enlarged perspective view showing a modified example in which a fitting portion is formed on one block, and FIG. 13(b)
) is a partially enlarged view of FIG. 13(a), and FIG. 14 is a perspective view showing a conventional polishing process of a magnetic head block. 12 is the internal winding groove (window part), 14 and 15 are blocks, 2
0 and 30 are grooves (fitting parts), 22 and 23 are tape running surfaces,
24 is a gap, 27, 27', 27'' are positioning rod members, and 28 is a jig. Patent applicant: Sharp Co., Ltd. Figure 10 (a)
) 1KIO figure (b) Maki 11 figure, 1/1 11

Claims (1)

[Claims] 1. A plurality of blocks each made of two magnetic materials joined via a gap whose outer end is exposed to the tape running surface and a window connected to the inner end of this gap. A magnetic head manufacturing method includes a step of positioning a magnetic head block with respect to a jig and polishing the tape running surface of each magnetic head block in this state. A fitting part is formed at a predetermined distance from the inner end of the magnetic head block, and when polishing the tape running surface of each magnetic head block, a common positioning rod member is fitted to the fitting part of each magnetic head block. A method for manufacturing a magnetic head, characterized in that each magnetic head block is positioned with respect to the jig by performing the following steps.