JPS6150202A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To simplify the manufacturing process of a magnetic head together with improvement of reliability of forming a groove part serving as a magnetic insulated layer between a recording/reproducing core and an erasion core for control of the distance between gaps of both cores. CONSTITUTION:Grooves 5 are formed for control of the gap width of both a recording/reproducing core 1' and an erasion core 2' after the material processing is over. Then a molding process is carried out by means of a glass of a low melting point. For both cores 1' and 2', the sides opposite to the grooved sides are processed down to the desired thickness for control of the distance between gaps of both cores. Then a groove 10 is formed with the length equivalent to the width of a magnetic head chip width to one of both cores in order to control the magnetic insulated width and to fill the glass of a low melting point for magnetic insulation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a tunnel erase type magnetic head used in a magnetic recording device.

Conventional Structure and Problems Regarding the structure of a bulk type magnetic head, FIG. 1a shows a view perpendicular to the sliding surface with a magnetic recording medium, and FIG. 5 shows a side view. In the figure, 1.1' is a core for recording and reproduction, 2 and 2' are cores for erasing, 3 is a gap for recording and reproduction, and 4 is a core for recording and reproduction.
, 4' is a gap for erasing, 5 is a groove for regulating the trunk width of the recording/reproducing and erasing gaps, 6 is a non-magnetic member for magnetic insulation between the recording/reproducing core and the erasing core, and 7 is a recording/reproducing member. 8 is a winding window for erasing. The processing steps for the conventional bulk type magnetic held shown in FIG. 1 will be explained with reference to FIG. 2. Figure a shows a state in which after processing the material, grooves 5 for regulating the gap widths for recording/reproducing and erasing are molded with low melting point glass. Next, grooves for forming winding windows are processed on cores 1 and 2 as shown in Figure 5, and then cores 1, 1' and 2 are
, 2'' by sputtering a non-magnetic material such as 5102 on the opposing surfaces of the cores 1 and 1' and 2 and 2' as shown in Figure 0.
is bonded to a glass 9 having a melting point slightly lower than that of the groove mold glass to form a recording/reproducing core and an erasing core each having a predetermined gap length. Thereafter, in order to integrate the two cores and provide magnetic insulation between the two cores, they are joined via a nonmagnetic member 6 and cut to a predetermined width.
The magnetic head tinop shown in the figure can be obtained.

However, the drawback of this method is that when glass is used as the non-magnetic material in integrating the recording/reproducing core and the erasing core, it is necessary to use glass with a specified width to regulate the magnetic insulation width. It is necessary to bond non-magnetic members such as the like with an organic adhesive, and when the above-mentioned adhesive is used, the adhesive strength decreases due to humidity, and there are problems such as protrusion and peeling of the non-magnetic member. As a solution to this problem, glass may be melted and bonded, but the magnetic insulating layer cannot be controlled simply by sandwiching and melting the glass. In addition, in the processing process, the recording/reproducing core 1
, 1', the erasing cores 2, 2', and the non-magnetic member 6 are each independent, and these are joined separately, so this joining process is numerous and complicated.

Furthermore, after the voids are formed by joining the cores 1, 1' and 2, 2', the side surfaces of the cores 1', 2' are processed to a predetermined thickness in order to regulate the distance between the recording/reproducing void and the erasing void. Because there is a winding window in the center of the core during the process, problems such as core cracks are likely to occur.

OBJECTS OF THE INVENTION An object of the present invention is to provide a method for manufacturing a magnetic head that improves the drawbacks of the prior art described above, has excellent reliability, and is easy to manufacture.

Structure of the Invention The method for manufacturing a magnetic head of the present invention involves forming a groove to serve as a magnetic insulating layer between the two cores that regulates the distance between the core gap for readout and the core gap for erasing, and forming a groove in the groove to become a magnetic insulating layer. Melting point glass is melted and filled and bonded, and low melting point glass is melted and bonded to form voids for the recording/reproducing core and erasing core, respectively, thereby forming voids and integrating the recording/reproducing core and the erasing core. It was designed to be done at the same time. This makes it easier to regulate the magnetic insulating layer, greatly improving reliability and simplifying the manufacturing process.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 3 shows that after processing the material in the same way as in the conventional process,
A groove 6 for regulating the gap width of the recording/reproducing core and the erasing core is formed and the core is molded with low melting point glass. Thereafter, as shown in FIG. 4, the recording/reproducing core 1' and the erasing core 2' are coated with a predetermined thickness on the opposite side of the grooved surface to regulate the distance between the recording/reproducing gap and the erasing gap. Process it. Next, in this embodiment, a groove 1o is formed in one of the cores to regulate the width of the magnetic insulation and to fill with low melting point glass for magnetic insulation, with a length corresponding to the width W1 of one magnetic hemostat.

To form a gap, a non-magnetic material such as S No. 2 is deposited to a predetermined thickness on the opposing surfaces of cores 1, 1' and cores 2, 2' by sputtering, and cores 1, 1' and 2' are formed as shown in figure b. core 2,
2' are butted against each other, and in joining the cores, the low melting point glass 9 for air gap joining and the low melting point glass 11 for magnetic insulation, which has a smaller shrinkage rate than the magnetic core, are heated and melted and joined. Next, as shown in Figures c, d, and e, a magnetic head chip in which a magnetic insulating layer with a predetermined width exists between the recording/reproducing core and the erasing core is obtained by cutting with the grindstone 12 of blade @W2. .

Effects of the Invention According to the present invention, the recording/reproducing core and the erasing core are integrated at the same time as the gap is formed, and the filling is made to an appropriate size in consideration of the shrinkage rate of the magnetic insulating glass and the magnetic core. Because groove @W3 is provided, longitudinal direction and depth direction dj7
In this way, a stable magnetic insulating layer can be obtained and deformation of the magnetic core can also be prevented.

Furthermore, since it is easy to manufacture, it has the great effect of greatly improving the reliability of the magnetic head. When joining the recording/reproducing core and the erasing core, if the core and the magnetic insulation low melting point glass have the same shrinkage rate, the filling groove @W3 of the magnetic insulation low melting point glass should be widened. I can do it. Furthermore, it is also possible to use spacers or the like to regulate the space for magnetic insulation.

[Brief explanation of drawings]

Figure 1 is a configuration diagram and side view of a bulk type magnetic head viewed from a direction perpendicular to the sliding surface with the magnetic recording medium, and Figure 2 is a schematic diagram of the processing steps in a conventional bulk type magnetic head. , FIG. 3 is a diagram for explaining the processing steps according to the present invention, and FIG. 4 is a diagram for explaining the embodiment according to the present invention. 1.1'... Core for recording and reproduction, 2,2'...
... Core for erasing, 3 ... Gap for recording and reproduction, 4,
4'...Erasing gap, 6...Glass molded groove, 6...Nonmagnetic member, 7...
... Winding window for recording and reproduction, 8... Winding window for erasing,
9...Low melting point glass for gap bonding, 10...
...Low melting point glass filled groove, 11...Low melting point glass for magnetic insulation, 12... Grinding wheel. 1 Name of agent Patent attorney Toshio Nakao and one other person Figure 1 (Figure 2 (α)) (C) Figure 3

Claims (3)

[Claims] (1) In manufacturing a magnetic head in which a non-magnetic material is used to join the recording/reproducing core and the erasing core, both of these two cores or A method for manufacturing a magnetic head characterized by forming a groove portion on one side to serve as a magnetic insulating layer. (2) A method of manufacturing a magnetic head according to claim 1, characterized in that the gap bonding of the recording/reproducing core and the erasing core and the integration of the two cores are performed simultaneously. (3) A patent characterized in that glass is used as a non-magnetic member filling the space that will become the magnetic insulating layer, and the shrinkage rate of the glass after melting and cooling to room temperature is the same or smaller than that of the magnetic core. A method for manufacturing a magnetic head according to claim 1.