JPS62145517A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the crack of a deposited glass by executing the annealing processing by the temperature higher than the arrangement temperature of the deposited glass after the deposited glass is melted when magnetic bodies are deposited by the deposited glass. CONSTITUTION:Two magnetic body blocks 9 to form a V-shaped groove 9a at the equal interval are prepared, a stick-shaped deposited glass is respectively mounted at respective grooves 9a and a deposited glass 10 is melted and hardened. Continuously, the hardened deposited glass 10 is removed, the deposited glass is remained at the part of the groove 9a, one-side block 9A is formed, other block 9B cuts out a groove 9 for winding further, a gap forming material 3 formed at one side or two side facing surfaces of blocks 9A and 9B is exposed beforehand, and thereafter, at the peak part of the devision of the V-shaped groove 9a of the magnetic body blocks 9A and 9B, a gap forming material 3 is formed. Both blocks 9A and 9B are overlapped and heated, the deposited glass 10 is melted, the blocks 9A and 9B are unified, thereafter, the blocks 9A and 9B is cut along a line 11, grinding is executed and the produce is obtained.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention prevents the occurrence of cracks in the welded glass when manufacturing magnetic heads for various uses by welding magnetic materials together using the welded glass. Regarding the manufacturing method.

(Prior art) For example, as shown in FIG. 2, a magnetic material 1 as a core forming a winding window 6 and a magnetic material 2 as a core that forms a pair with the magnetic material 1 are placed on the recording medium running surface a side. When manufacturing a magnetic head by bonding with welded glass 4 through gap forming material 3, cracks 5 are formed in welded glass 4 as shown in FIG. 3 as the welded glass 4 is cooled and solidified after melting. Occasionally this occurred.

And due to the occurrence of rack 5 like this.

The yield in magnetic head manufacturing has decreased, and magnetic head
There was a problem that the reliability of the system was reduced.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing a magnetic head that can prevent the occurrence of cracks in the welded glass.

(Means for Solving the Problems) The present invention provides a method for producing a magnetic throat by welding I-magnetic materials together using a welding glass. It is characterized by annealing treatment.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

When manufacturing a magnetic head as shown in FIG.
As shown in Figure (A), two magnetic blocks 9 with 7-shaped grooves 9a formed at equal intervals are prepared, and a bar-shaped welded glass is placed in each groove 9a and heated to a temperature at which it melts. The welded glass 10 is melted and solidified by a method such as the above, and then, as shown in (B), the solidified welded glass 10 is removed by polishing or the like, leaving the welded glass in the groove 9a, and one block 9A is formed. and the other block 9B is
After the polishing, etc., the winding groove 9b is further cut, and the gap forming material 3 previously formed on the opposing surfaces of one or both of the blocks 9A, 9B is exposed by removing the welded glass, or the groove 9b is polished. 7-shaped grooves 9arI of magnetic blocks 9A and 9B after exposing the magnetic surfaces by
Gap forming material 3 is formed on the top of 11, and then (D)
As shown in FIG. 2, by overlapping both blocks 9A and 9B and heating them, welding glass 10 is melted and both blocks 9A and 9B are integrated, and then blocks 9A and 9B are cut along line 11. After performing necessary polishing, winding, etc., it is made into a product. Note that this example is a basic example, and the winding groove 9b may be formed on both blocks 9A and 9B, a magnetic thin film may be formed on the opposing surface of the magnetic body 1.2, and other methods may be used for various purposes. Processes such as applying a film or the like to appropriate locations are performed.

In the present invention, the occurrence of cracks in the welded glass 10 is prevented by annealing after the grinding shown in FIGS. 1(B') and 1(C). In addition to annealing after polishing as shown in FIGS. 1(B) and (C), the magnetic block 9A before polishing as shown in (A), and further annealing as shown in FIG. 1(D). , 9B may be stacked to melt the welded glass 1o, and then annealing may be performed. The annealing temperature Ta is relative to the transition point Tx of the glass.

The temperature preferably satisfies the following relationship: Tx≦Ta≦Tx+20°C, and
The annealing time (the time for holding at a constant temperature Ta) is generally 5 to 20 hours.

To explain a specific example, a lead-boric acid glass having a dislocation point Tx=310° C. is used as the welded glass 10, and a Mn-Zn-based glass is used as the magnetic block 9.
The annealing temperature was varied between 250°C and 350°C, and the annealing time was 0 and 5 hr -10.
After changing the temperature for 0 hr and bringing it to room temperature by natural heat radiation,
As shown in (D), block 9A and 9B are overlapped and 40
The intermediate product was melted at 0'C for 5 minutes and cut along line 11, and the crack occurrence rate was investigated. As a result, the fourth
We obtained the results shown in the figure. As is clear from FIG. 4, cracks in the welded glass can be prevented by appropriately selecting the annealing temperature and time.

(Effects of the Invention) As described above, in the present invention, since the welded glass is annealed after it is melted, the occurrence of cracks in the welded glass is prevented and the reliability of the magnetic head is improved. can be improved.

[Brief explanation of drawings]

1(A) to D) are diagrams showing an example of the manufacturing process of a magnetic head to which the manufacturing method of the present invention is applied, FIG. 2 is a perspective view showing an example of the magnetic head obtained by the present invention, and FIG. FIG. 4 is a cross-sectional view of a welded glass portion illustrating the problems of the conventional technique, and a curve diagram illustrating the effects of implementing the present invention. Patent Applicant TDC Co., Ltd. Agent Patent Attorney Waka 1) Masaru - Figure 4 - e-Ta=350″C ÷ Th2250″C ÷Ta=310-e-Th=320″C

Claims (1)

[Claims] When manufacturing a magnetic head by welding magnetic materials together using welded glass, a method for manufacturing a magnetic head is characterized in that the welded glass is melted and then annealed at a temperature higher than the transition temperature of the welded glass.