JPH0276108A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To prevent lowering of the force to joint a core and slider by cutting a magnetic block to a prescribed track width, then heat-treating the block at the temp. higher than the softening point of the glass for joining and lower than the softening point of a magnetic gap packing material. CONSTITUTION:The magnetic head under production is heated in a nitrogen atmosphere in the range from 515 deg.C softening point of low-melting lead glass to 820 deg.C softening point of borosilicate glass. Although 550 deg.C is above the softening point of the joining glass and associates the possibility of the removal of the core 1 from the slider 2, a solid phase diffusion arises between the borosilicate glass 3 to serve as the softening point at the time of joining the slider 2 and the core 1 and the ferrite to be the material of the core 1 and the slider 2, thus allowing joining of the core 1 and the slider 2 to some extent. The core is, therefore, no longer removed from the slider even if the magnetic head is heated to the temp. above the softening point of the joining glass. The joining glass softened by this heat treatment is repaired of the flaws made therein by cutting, etc., in this way and the degradation of the force to join the core and the slider is prevented.

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 magnetic recording/reproducing device that reads data from and writes data to a magnetic recording medium. .

BACKGROUND ART FIGS. 3 and 4 are a perspective view and a side view of a conventional floating magnetic head. In FIGS. 3 and 4, 1 is a core made of ferrite or the like, 2 is a slider made of ferrite or the like, and the slider 2 and the core 1 form a magnetic circuit.

Further, the slider 2 and the core 1 are bonded to each other via borosilicate glass or the like which serves as a gap filler. At this time, core 1
The joint surface between slider 2 and slider 2 is only the gap facing surface,
Since a sufficient bonding force cannot be obtained, the bonding force is reinforced by the bonding glass 3. 4 is the front gap,
5 is the back gap.

A method of manufacturing the conventional magnetic head constructed as described above will be described below.

First, as shown in FIG. 5, magnetic blocks 6 and 7 each made of ferrite or the like are prepared as a core and a slider. Next, as shown in FIG.
a, a front gap facing meat surface 6b, and a pack gap facing surface 6c.

Next, as shown in FIG. 7, a gap film 8 made of a material such as borosilicate glass to serve as a gap filler is formed on the pack gap facing surface 6c and the front gap facing surface 6b.

Next, the magnetic block 6.7 is fixed so that it comes into contact with the magnetic block 6.7 through the gap film 8, and the bonding glass 9 is placed in the winding groove 6a on the side facing the front gap 6b.
Heat.

The heating temperature at this time is higher than the temperature at which the bonding glass 9 melts, and lower than the temperature at which the silicic acid glass melts.

The state in which the magnetic blocks 6 and 7 are joined in this way is shown in the eighth section.
As shown in the figure. Next, the bonded magnetic blocks 6 and 7 are sliced into a predetermined width. For example, cut along dotted line AB and dotted line CD shown in FIG.
A core block 10 as shown in the figure is cut out. Then the 10th
As shown in the figure, the medium facing surface of the core block 10 is skied with a diamond grindstone to form grooves 11 and 12. Next, the portion of the magnetic block 6 of the ski-processed core block IO is ground with a grindstone connected to each other with a predetermined track width and grinding interval, as shown in FIG. 1st
The 11th grindstone rotates around the rotation axis EF shown in Figure 1.
Apply it to the magnetic block from the direction of arrow G shown in the figure. Then, it is shaped into the shape shown in FIG. Finally, the medium facing surface is lapped or chamfered.

Problems to be Solved by the Invention In general, bonded glass 9 with scratches tends to crack when stress is applied. In the conventional configuration, when processing skis or cutting the magnetic block 6 to obtain a predetermined toe rack width,
Since the bonding glass 9 will be scratched, if stress is applied to the bonding glass 9 during the process of chamfering the core 1 or winding a wire around the core 1, the core 1 may come off from the slider 2. there were.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a method for manufacturing a magnetic head that can repair scratches etc. in the bonded glass and prevent a decrease in the bonding force between the core and the slider. It is said that

Means for Solving the Problem In order to achieve this objective, two magnetic blocks are bonded via a non-magnetic material that serves as a gap filler, reinforced with bonding glass, and the magnetic blocks are made into a predetermined track width. After cutting, the method includes a step of performing heat treatment at a temperature higher than the softening point of the bonding glass and lower than the softening point of the magnetic gap filler.

Function: With this configuration, the glass for bonding is softened, and scratches, chipping, etc. that occur in the glass for bonding can be repaired.

EXAMPLE A method of manufacturing a magnetic head according to an example of the present invention will be described below.

As shown in FIG. 12, the process up to the step of cutting the magnetic block 6 from both sides to obtain a predetermined track width is the same as the conventional method. In this example, low melting point lead glass (softening point 515°C) was used as the bonding glass, and borosilicate glass (softening point 820°C) was used as the gap filler. In other words, the magnetic head in the process of being manufactured as shown in FIG.
℃ to the softening point of borosilicate glass of 820℃. At this time, heating is performed in a nitrogen atmosphere. In this example, heating was performed at 550° C. for about 10 minutes. At this time, 550°C is above the softening point of the bonded glass, and it is conceivable that the core may come off from the slider. However, when bonding the slider and core, a phenomenon called solid phase diffusion occurs between the borosilicate glass that serves as the gap filler and the ferrite that serves as the material for the core and slider, and it is possible to bond the core and slider to some extent. Therefore, even if the temperature is higher than the softening point of the bonded glass, the core will not come off the slider.The bonded glass softened by this heat treatment can repair scratches caused by cutting, etc.

The difference in bonding force between the core and slider between the conventional example and this example will be explained below. Figure 1 shows the procedure for the test. In this test, the slider was fixed, a load was applied to the core in the direction of the arrow X shown in Figure 1, and the load was measured when the core was removed from the slider. be. The results are shown in FIG.

As shown in Figure 2, in this example, the load was around 200g,
In addition, in the conventional example, the number of times the core was removed from the slider was greatest at around 100g. In other words, the bonding force between the core and slider was stronger when heat treatment was performed.

As described above, according to this example, after bonding two magnetic blocks with bonding glass via borosilicate glass, heat treatment is performed at a temperature higher than the softening point of the bonding glass but lower than the softening point of the borosilicate glass. Therefore, scratches in the bonded glass can be repaired (1) and the bonding strength between the core and the slider can be prevented from decreasing.

Effects of the Invention The present invention connects two magnetic blocks through a non-magnetic material serving as a gap filler, reinforces them with bonding glass, and cuts the magnetic blocks to a predetermined track width. Equipped with a heat treatment process at a temperature higher than the softening point and lower than the softening point of the magnetic gap filler, the glass for bonding is softened and scratches, chipping, etc. that occur on the glass for bonding can be repaired. This can prevent the bonding force between the core and the slider from decreasing.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the test method, Figure 2 is a graph showing the difference in bonding force between the core and slider between the conventional example and this example.
FIG. 3 is a perspective view of the floating magnetic head, FIG. 4 is a side view of the same, and FIGS. 5 to 12 are perspective views of the floating magnetic head produced in each step. 1... Core 2... Slider 3... Bonded glass 4... Front gap 5... Back gap Name of agent Patent attorney Awano Haka Shigetaka 1 person Figure 1
Figure 2 Figure 3 41 Figure 5 Figure 6

Claims (1)

[Claims] A non-magnetic material serving as a magnetic gap filler is interposed between the two magnetic blocks to bond the two magnetic blocks, and a bonding glass having a softening point lower than that of the gap filler is used to bond the two magnetic blocks. a first step of reinforcing the bonding, a second step of cutting at least one of the magnetic blocks to a predetermined track width, and after the second step, at a temperature higher than the softening point of the bonding glass. A method for manufacturing a magnetic head, further comprising a third step of performing heat treatment at a temperature lower than the softening point of the magnetic gap filler.