JPS6173217A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To shorten the time required for positioning a recording/reproducing and erasing cores so as to simplify the manufacturing works of a magnetic head, by providing plural grooves for forming ring shapes in the recording/ reproducing and erasing cores in at least symmetrical pairs and joining the cores to one body. CONSTITUTION:Notched grooves 5 and 7 are respectively provided in recording/ reproducing magnetic cores 1 and 1' and erasing magnetic cores 2 and 2' and the grooves 5 and 7 are filled with low melting point glass. Then two grooves 12 for forming ring shapes and a nonmagnetic layer 11 by sputtering are formed in and on the cores 1 and 2. Then the cores 1 and 2 with the grooves 12 and cores 1' and 2' without groove are respectively put together and the glass filling the grooves 5 and 7 are welded together in the shape of rings under a high- temperature atmosphere, and thus, gaps 3 and 4 are formed. Then the ring- shaped core having the recording/reproducing gap 3 and the other ring-shaped core having the erasing gap 4 are joined together by means of a resin bonding agent with a nonmagnetic body 6 in between and a deviation (t) at the center.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a tunnel erase type magnetic head used in a magnetic recording device that performs recording and reproduction by rotating a medium.

Conventional configuration and its problems Regarding the configuration of tunnel erase type magnetic head-M
, will be explained using Figure 1. Figure 1a shows the front surface of the head in contact with the recording medium, which is sandwiched between magnetic cores 1 and 1' that are abutted against each other. It has the function of erasing previously recorded information by cores 2, 2' and erasing gaps 4, 4' formed of non-magnetic material. This state is shown in FIG. 3, where new information 1o is written on the previously recorded information e using the recording/reproducing gap 3, and the remaining previous information 9 is erased using the erasing gaps 4, 4'.

In this case, since the recording medium is rotating in the direction of the arrow, it is necessary to provide a center shift t between the writing-reading gap 3 and the erasing gaps 4 and 4'. When reproducing, this center shift t is provided in opposite directions in both magnetic heads.

FIG. 1 is a front view of FIG. 1a, in which the widths of the recording/reproducing gap 3 and the erasing gap 4 are regulated by notches 5 and 7, and these notches are filled with low-melting glass.

Furthermore, the bonding glass 8 has magnetic cores 1, 1' and 2.
, 2' is intended to increase the bonding strength.

Next, a method for manufacturing a magnetic head will be explained using FIG. As shown in a, notches 6 and 7 are provided to form a ring shape in the thicker magnetic cores 1 and 2 of the magnetic cores 1, 1', and 2.2' molded with low melting point glass. A groove is provided as shown by bVc, and then a groove 3102 is formed on the butting surface.
A non-magnetic material 11 such as the like is deposited to a predetermined thickness by sputtering,
As shown in C, glass material 8 and molded glass materials 5 and 7
The magnetic cores 1 and 1' and then 2 and 2' are joined together, and a recording/reproducing gap 3. An erasing gap 4 is formed. Then, the non-magnetic material 6 is integrated with a ring-shaped core for wiring reproduction and erasing, which is formed like a scissor 4c, so as to maintain the center deviation t. Next, as shown in FIG. 1, it is cut to a width of Wl to obtain a head chip.

However, the accuracy of the center deviation t mentioned above is on the order of several micrometers, which is 4, and it takes time to align the parts when integrating them, resulting in a large number of man-hours. In addition, since the center shift t of the magnetic heads used on both sides of the recording medium must be reversed, it is troublesome to do this separately when integrating the magnetic core for recording and reproduction, and the magnetic core for erasing. OBJECT OF THE INVENTION The present invention eliminates such conventional drawbacks, and aims to shorten the time required to align recording/reproducing and erasing cores and reduce the complexity of the work. It is something.

Structure of the Invention The method of manufacturing a magnetic head of the present invention provides a recording/reproducing core and an erasing core in which a plurality of ring-shaped grooves are symmetrically provided in a magnetic core for recording/reproducing and an erasing core. The structure is such that the center of the recording/reproducing gap and the center of the non-magnetic material sandwiched in the erasing gap are reversed by integrating the magnetic material for recording/reproducing and erasing. The number of heads that can be obtained from an integrated core increases by a multiple of the number of grooves forming the ring shape, reducing the number of man-hours required for integration, and eliminating the complexity of separating the direction of center deviation during integration. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4, 5, and 6. In FIGS. 4, 6, and 6, the same parts as in FIGS. 1 and 2 are designated by the same numbers.

As shown in FIG. 4A, cutout grooves 6 and 7 reaching the recording/reproducing core are provided and molded with low melting point glass. Next, as shown in b, two grooves 12 are formed to form a ring shape.
After the main processing, a nonmagnetic layer 11 such as Sio2 is sputtered. After that, magnetic cores 1 and 2 with grooves 12 as shown in C
and magnetic cores 1/ and 2/ that do not have grooves 12,
In this state, mold glass 5,
7 are fused together in a ring shape to form gaps 3 and 4. Next, the ring-shaped core having the recording/reproducing gap 3 and the ring-shaped core having the erasing gap are integrated with a resin adhesive by sandwiching the non-magnetic material 6 while maintaining the center deviation t. This integrated state is shown in Figure 5, but if it is then cut into two pieces with a cutter with a blade width of °C, and then cut into Wl with a cutter with a blade width of n, the same thing as in Figure 1 will be obtained, and it will be functional. However, by integrating the recording/reproducing ring core and the erasing ring core at once, it is possible to manufacture a magnetic head that can be used on both sides of a recording medium. In other words, there are two types of objects having a center deviation t.

In addition, as shown in FIG. 6, grooves 13 and 14 forming a ring shape
If the groove shape itself is symmetrical, it is possible to use a blade of the same shape when machining the grooves, which improves efficiency when machining multiple grooves. The functions of the magnetic heads are the same, but there are two types with opposite center deviations t.

Effects of the Invention As described above, according to the method of manufacturing a magnetic head of the present invention,
At least two symmetrical ring-shaped grooves are provided in the magnetic core to form a gap, and then the recording/reproducing ring core and the erasing ring core are integrated while maintaining the center offset t. The time required for this integration can be shortened, and the complexity of checking the direction of center deviation t separately at the time of integration can be eliminated.

[Brief explanation of drawings]

Figure 1 shows the structure of the magnetic head, Figure 2 shows the conventional magnetic head manufacturing method, Figure 3 shows the function of the erasing gap, Figures 4, 6, and 6. FIG. 3 is a diagram showing a method of manufacturing a magnetic head according to an embodiment of the present invention. 1.1'...Magnetic core for recording and reproduction, 2,2'
...... Magnetic core for erasing, 3... Gap for recording and reproduction, 4... Gap for erasing, 5,
7... Molded glass, 6... Non-magnetic material, 8... Bonding glass, 11...
-Nonmagnetic layer, 12, 13, 14... Ring-shaped forming groove. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 (b) (C) Figure 3 Figure 4 (b+ (C) Figure 5 f 1' Figure 6

Claims (1)

[Claims] When manufacturing a magnetic head that has a structure in which the center of the recording/reproducing gap and the center of the non-magnetic material sandwiched between the erasing gap are misaligned, the magnetic cores for recording/reproducing and erasing are ring-shaped. By providing a plurality of grooves, at least two of which are symmetrical, and integrating the recording and reproducing core and the erasing core, the center of the recording and reproducing gap and the center of the non-magnetic material sandwiched between the erasing gap and A method of manufacturing a magnetic head characterized in that the center deviation of the magnetic head is reversed.