JPH01220205A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To simplify a manufacturing process by applying track working after joining a C type core block with an I type core block, and filling glass in a groove formed between tracks. CONSTITUTION:The C type core block 11 and the I type core block 12 made of a magnetic material such as ferrite, etc., are prepared, and after a glass thin film, etc., also used for adhesion to a gap is formed on the C type core block 11, both core blocks 11 and 12 are joined, then, a joint core block 13 is formed. Next, the track working is applied obliquely in the longitudinal direction of the gap 20, then, the groove 15 is formed. Next, the glass 16 is filled in the groove 15, and it is heated and welded, and both core blocks 11 and 12 are adhered, then, the core block 13 of a magnetic head can be formed. Next, a single magnetic head chip is formed on the groove 15 in parallel with the working direction of the track by cutting as dotted lines A, B, and C. In such a way, it is possible to reduce the working process of the track.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic head used in recording/playback machines such as video tape recorders and R-DATs.

[Conventional technology]

The manufacturing process of a conventional magnetic head is shown in FIGS. 12 to 15. First, as shown in FIG. 12, prepare a C-shaped core block 1 and a summer-shaped core block 2 made of magnetic material such as ferrite. Next, as shown in FIG. Tracks are processed in a direction perpendicular to the ridgelines 1a and 2a to form grooves 3.4.Next, the C-shaped core block 1 and the summer-shaped core block are joined to form a joined core block, and the joined core block As shown in Figure 14 (
The groove 3.4 is filled with glass 5, the glass 5 is melted and heated, and both core blocks 1.2 are bonded together to form the core block 6 of the magnetic head. Next, in the state shown in FIG. 14, dotted line X, Y
, Z in a direction intersecting the track processing direction and make an azimuth angle as necessary to form the core chip 7 of a single magnetic head as shown in FIG. FIG. 15 shows a plan view of the core chip 7 of the magnetic head, where 8 is a tape sliding surface, 9 is a track, and 10 is a gap. The core of the magnetic herad chip 7 is then wound with a coil to form a magnetic head.

[Problem that the invention seeks to solve]

However, in the above method for manufacturing a magnetic head,
A machining process is required to perform track machining on each of the C-type core block and the ■-type core block, and work is required to align the tracks of both core blocks after track machining. Ends 7a to 7d of the magnetic material that are nearly parallel (see FIG. 15) tend to generate noise from the ends, and are asymmetrical with respect to the thickness direction of the magnetic head chip 7 (see FIG. 15). Since the upper and lower sides are asymmetrical with respect to the line A-A', there are problems such as uneven wear due to tape running and poor contact between the tape and the sliding surface.

[Means for solving problems]

The present invention has been proposed to solve the above problems, and includes joining a C-type core block and an I-type core block to form a joined core block, and forming a jointed core block on the sliding surface of the joined core block. A track is machined diagonally to the length direction of the gap formed by the core block,
A method of manufacturing a magnetic head is provided, in which the grooves formed between the tracks are filled with glass, and then the tracks are cut in parallel to the longitudinal direction to form a core chip of the magnetic head.

[For production]

The present invention simplifies the manufacturing process, improves noise characteristics, and improves the touch between the magnetic head sliding surface and the tape.

〔Example〕

Next, examples of the present invention will be described. Figures 1 to 5
The drawings are manufacturing process diagrams showing a first embodiment of the method for manufacturing a magnetic head according to the present invention. First, as shown in FIG. 1, a C-shaped core block 11 made of a magnetic material such as ferrite and! A mold core block 12 is prepared. Next, C type core block 1
1. After forming a thin glass film or the like that functions both as a gap and an adhesive, or that functions only as a gap, by a vapor deposition method such as sputtering, both core blocks are joined to form a joined core block 13 as shown in Fig. 2. Form. In Figure 2,
20 is a gap when forming a magnetic head. Next, as shown in FIG. 3, with respect to the longitudinal direction of the gap 20, track machining is performed diagonally by an azimuth angle, if necessary, to form a groove 15. Here, the track processing is performed so that the depth direction thereof is perpendicular to the upper surface of the block 13.

Next, the groove 15 is filled with glass 16, melted and heated, and both core blocks 11 and 12 are bonded together as shown in Fig. 4 to form the core block of the magnetic head.Next, track processing is performed in the state shown in Fig. 4. The groove 15 is cut along dotted lines A, B, and C parallel to the direction to form a single magnetic head chip 17 as shown in FIG. FIG. 5 shows a plan view of the magnetic core chip 17, 18 (19) is a tape sliding surface (track), 20
is the gap. The core chip 17 of the magnetic head is then wound with a coil around the core portion to form a magnetic head.

In the method for manufacturing the magnetic head described above, track machining is performed on both core blocks at once after joining the C-shaped core block 11 and the ■-shaped core block 2.
This reduces the track machining process, eliminates the need for track alignment between both blocks, and since there is no end of the magnetic material parallel or nearly parallel to the gap 20, noise generated from the end can be reduced, and the magnetic The head chip 17 is symmetrical in the thickness direction (the top and bottom are symmetrical with respect to the line B-B' in FIG. 5), and the wear caused by the running of the tape is uniform, so that the tape (not shown) A good touch between the contact surface 18 and the contact surface 18 can be maintained at all times.

6 to 8 are manufacturing process diagrams showing a second embodiment of the method for manufacturing a magnetic head according to the present invention. First, a C-shaped core block 21 and a ■-shaped core block 22 are prepared, which are made of a magnetic material in which a thin glass film or the like, which serves both as a gap and an adhesive, or only serves as a gap, is formed by a vapor deposition method such as sputtering. Next, the C-type core block 21 and the I-type core block 22 are joined, and the joined core block 23 is attached as shown in FIG.
, and if necessary, perform track machining in an oblique direction by an azimuth angle with respect to the longitudinal direction of the 3° gap when forming the magnetic head to form 'a25. Here, the track processing is performed at an angle θ with respect to the tape sliding surface of the joining core pro 7-grid 23. Glass 26 is filled in the zero-order groove 25, melted and heated, and as shown in FIG. Both core blocks 21 and 22 are glued together to form the core block of the magnetic head. Next, in the state shown in FIG. 7, the groove 26 is cut along dotted lines parallel to the track machining direction, as shown in FIG. 8. A single magnetic head chip 27 is formed as shown in FIG. FIG. 8 shows a plan view of the magnetic head chip 27, in which 28 is a tape sliding surface, 29 is a track, and 30 is a gap.

The magnetic head chip 27 is then wound with a coil around its core portion to form a magnetic head.

In the above method for manufacturing a magnetic head, track machining is performed on both core blocks at once after joining the C-shaped core block 21 and the ■-shaped core block 22.
This reduces the number of track machining steps and eliminates the need for track alignment between both blocks.Also, the number of ends of the magnetic material that are parallel or nearly parallel to the gap 30 is reduced by half to 303.30b compared to the conventional method, and the back end of the magnetic material is reduced to 303.30b. The magnetic head chip 27 is symmetrical with respect to the thickness direction (the top and bottom are symmetrical with respect to the c-c' line in FIG. 8), and wear due to tape running is reduced. As a result, good contact between the tape (not shown) and the contact surface 28 can be maintained.

9 to 11 are manufacturing process diagrams showing a third embodiment of the method for manufacturing a magnetic head according to the present invention.

First, as shown in FIG. 9, a C-shaped core block 3 made of a magnetic material is formed with a thin glass film or the like which functions as both a gap and an adhesive, or functions only as a gap, by a vapor deposition method such as sputtering.
A joined core block 33 is prepared by joining 1 and I-type core block 32. Next, the direction is diagonal to the longitudinal direction of the gap 40 when forming the magnetic head (indicated by angle θ2, θ2 is 90° C. or less). Perform track processing with groove 35.
form. Here, the track machining is performed so that the depth direction is perpendicular to the tape sliding surface of the joint core block 33 and the bottom surface of the groove 35 is arcuate.

Next, the groove 35 is filled with glass 36, melted and heated, and both core blocks are bonded.Similarly to the first and second embodiments described above, the glass 36 is cut parallel to the track machining direction, and as shown in FIG. Thus, a single magnetic head chip 37 is formed. FIG. 11 shows a plan view of the magnetic head chip 37, in which 38 is a tape sliding surface, 39 is a track, and 40 is a gap.The 9M1 magnetic head chip is then wound with a coil around its core to form a magnetic head. .

In the above method for manufacturing a magnetic helad, track machining is performed on both core blocks at once after joining the C-shaped core block 31 and the I-shaped core block 32,
This reduces the number of track processing steps, eliminates the work of track alignment for both blocks, and is symmetrical in the thickness direction of the magnetic head chip (in Figure 11, the top and bottom are symmetrical with respect to the D-D' line. ), the wear caused by the running of the tape becomes uniform, and the contact between the tape (not shown) and the contact surface can be maintained in good condition.

〔Effect of the invention〕

As described above, in the method for manufacturing a magnetic head of the present invention, a C-shaped core block and a ■-shaped core block are joined to form a joined core block, and the sliding surface of the joined core block is covered by both core blocks. If necessary, tracks are formed diagonally in the longitudinal direction of the gap to be formed, the grooves formed between the tracks are filled with glass, and then the tracks are cut parallel to the longitudinal direction. Since the core chip of the magnetic head is formed, the track machining process can be reduced, the track alignment process of both core blocks can be eliminated, and when used as a magnetic head, noise characteristics generated from the edge of the magnetic material and Abrasion of the tape sliding surface due to tape running becomes uniform, resulting in effects such as maintaining good contact between the tape and the sliding surface.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the method for manufacturing a magnetic head according to the present invention, FIG. 1 is a perspective view of a C-type core block and an I-type core block, and FIG. 2 is a perspective view of a C-type core block and an I-type core block. FIG. 3 is a perspective view of a state in which the mold core block is joined, FIG. 3 is a perspective view of a state in which track processing has been performed, FIG. 4 is a perspective view of the core block of the magnetic head, and FIG. 5 is a plan view of the magnetic helad chip. 6 to 8 show a second embodiment of the method for manufacturing a magnetic head according to the present invention, FIG. 6 is a perspective view of a state in which track processing has been performed, and FIG. 7 is a view of a core block of a magnetic head. A perspective view, FIG. 8 is a plan view of a magnetic head chip, FIGS. 9 to 11 show a third embodiment of the method for manufacturing a magnetic head according to the present invention, and FIG. 9 shows a C-shaped core block and an L-shaped core block. FIG. 10 is a perspective view of the core block joined together, FIG. 10 is a perspective view of the track processed state, FIG. 11 is a plan view of the magnetic head chip, and FIGS. 12 to 15 are conventional magnetic head manufacturing methods. FIG. 12 is a perspective view of a C-shaped core block and an L-shaped core block, FIG. 13 is a perspective view of a track-processed state, FIG. 14 is a perspective view of a magnetic head core block, and FIG. 15 is a perspective view of a core block of a magnetic head. The figure is a plan view of the magnetic helad tip. 1.1i21.31...C-type core block 2.12.
22.31...L type core block 3.4.15.25
．． 35...Groove 5.16.26.36...Glass 6.13.23.33...Joining core block 7.17
．． 27.37...core chip of magnetic head 8.18.28.38...sliding surface of tape 9.19.
29.39...Track 10.20.30.40...Gap Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 figure

Claims (1)

[Claims] A C-shaped core block and an I-shaped core block are joined to form a joined core block, the joined core block is subjected to track processing, the grooves formed between the tracks are filled with glass, and then the tracks are A method of manufacturing a magnetic head, characterized in that the core chip of the magnetic head is formed by cutting parallel to the longitudinal direction.