JPS6350766B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a magnetic head.

Figure 1 shows the structure of a magnetic head made up of four stacked blocks as an example of a magnetic head according to the prior art. A glass film is formed by a method etc., and blocks 3 and 4 are formed.
Pressure is applied from both sides of the glass and the adhesive glass is melted and bonded at high temperature. The blocks 3 and 4 may be formed with a glass film in advance in the same way, or may be bonded together using a glass injection method. Here, as shown in the figure, block 1, 2 or block 3,
If the structure is such that grooves 5 and 6 are formed to control the flying gap between the recording medium and the magnetic head, the grooves 5 and 6 will be formed even if pressure is applied from the side during bonding. Therefore, the A part of the adhesive layer 7 between the blocks 1 and 2 is not bonded because it does not receive sufficient pressure. For this reason, as shown in FIG.
This causes the problem of the adhesive layer opening up. Opening of the adhesive layer applies stress to the block, which affects the recording and reproducing characteristics of the magnetic head, and is equivalent to scratches on the side facing the recording medium, so there is a risk of head flash. The magnetic head's properties also increase, causing deterioration of its properties as a magnetic head.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a method for manufacturing a magnetic head that stabilizes the adhesive layer between materials and the adhesive layer thickness of a magnetic head formed by laminating a plurality of materials. .

A feature of the present invention is that when a glass film is formed on the bonding surface of the materials using a glass sputtering method or the like, the thickness of the glass film is made thinner on the part of the material that is not pressurized than on other parts during bonding. Alternatively, the glass film should not be formed on this portion.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

The magnetic head shown in FIG. 3 is a two-track type rotating magnetic head, and will be explained using this as an example. The parts that perform recording and playback are head cores 8 and 9.
Ceramic chips 10 and 11 made of non-magnetic material are arranged on both sides thereof. Furthermore, ferrite blocks 12 and 13 are arranged on both sides of the block to shield pseudo signals from the outside and to improve the S/N ratio.

Each block is glued with glass. A glass film is formed in advance by glass sputtering on the adhesion facing surfaces of the head cores 8 and 9. When the glass film is formed on the entire surface, there is a floating gap between the recording medium and the magnetic head on both sides of the head cores 8 and 9. Since there are grooves 14 and 15 for controlling the head cores, there arises a problem that the adhesive layer opens at the part B of the adhesive layer between the head cores 8 and 9, as described above.

Therefore, when forming the glass film on the head cores 8 and 9, the head core is divided into a D section and an E section as shown in FIG. 4, and the glass film thickness of the D section is formed to be thinner than that of the E section shown by diagonal lines.

The D section and the E section correspond to the B section and C section in FIG. 3, respectively. In other words, in Fig. 3, when each part is bonded to glass by pressing force from the side, there are grooves on both sides of the adhesive layer 1, which prevents the pressure from being completely transmitted.
In the D section of FIG. 4, which corresponds to the B section of 6, the glass film is formed thinner than in the E section. When the blocks 8, 9, 10, 11, 12, and 13 are laminated and bonded to glass in this way, the glass film is formed thinner in the B part of the adhesive layer 16 in FIG. 3 than in the C part, so as shown in FIG. As shown in FIG. 2, the head cores 8 and 9 are not forced apart toward the groove side and the adhesive layer is not opened, and the head cores 8 and 9 are bonded together with an appropriate adhesive layer.

In another embodiment of the present invention, in the head core shown in FIG. 4, portion D is masked with a jig so that no glass film is formed, and a glass film is formed only on portion E. By doing this, the third
In the figure, when each part is bonded to glass by pressing force from the side, a part of the molten glass in part C, where the glass film is formed, is sucked up to part B by the principle of capillary action and is bonded with an appropriate adhesive layer. .

Note that the blocks 10, 11, 12, and 13 may be bonded by forming a glass film on the bonding surfaces in advance as in the case of the head cores 8 and 9, or by injecting glass into the bonding portions at the time of bonding.

According to the present invention, in a magnetic head formed by laminating a plurality of materials, it is possible to stabilize the adhesive layer thickness and adhesive state between the materials, eliminate the influence on recording and playback characteristics, and reduce the gap between the adhesive surfaces. This eliminates the risk of head crushing.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing and explaining a method of manufacturing a magnetic head according to the prior art, and FIG. 2 is a diagram showing problems in the method of manufacturing a magnetic head according to the prior art.
FIGS. 3 and 4 are diagrams for explaining a method of manufacturing a magnetic head according to an embodiment of the present invention. 8, 9... Head core, 10, 11... Ceramic chip, 12, 13... Ferrite block, 14, 15... Groove, 16... Adhesive layer.

Claims (1)

[Claims] 1. In a magnetic head where a plurality of materials are laminated in advance with a glass film formed on the bonding surface by glass sputtering method etc., and a groove is formed in a part of the laminated material part, when forming the glass film, the groove is The thickness of the glass film on the joining surfaces of the materials facing each other is formed thinner than other parts, or the glass film is not formed on the joining surfaces of the materials facing the groove, and then the materials are laminated by heating and pressing. A method of manufacturing a magnetic head.