JPS6231408B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic head component, which comprises welding a second member to a first member, which is a magnetic head component.

Since a magnetic head records and reproduces information by sliding against a recording medium, its sliding surface is worn out as the head slides. When a magnetic tape is used as the recording medium, the core part (the part that performs recording and playback) is placed in the upper half or lower half of the tape width (see Figure 1 a) in order to enable the magnetic tape to be reciprocated. It is located. in this case,
If the tape sliding surface of the core and the rest of the tape sliding surface are made of materials with different hardnesses, the sliding surface of the head will lose its smoothness due to long-term sliding with the magnetic tape. , the contact condition between the core of the magnetic head and the magnetic tape deteriorates, resulting in poor frequency characteristics during recording and reproduction. For this reason, it is desirable that the remaining tape sliding surface be made of the same material as the core. Since the remaining tape sliding surface does not record or reproduce information, it is convenient to construct it on a case made of the same material as the core.

On the other hand, in recent years, materials with high hardness such as hard permalloy and sendust have been used for the core to improve the wear resistance of the core. Therefore, it is desirable that the case be made of the same material as the core. However, although there is no particular problem when making hard permalloy, sendust, etc. into a plate shape like a core, it is difficult to draw them into a case (decreased press processing accuracy, shortened press die life, and (causing cracks, etc. in the processed material). The present invention solves these problems by welding a member (second member) harder than the case (first member) to an opening provided in a magnetic head case, which is an example of a magnetic head component. This is to achieve the intended purpose. The present invention will be explained below with reference to the drawings.

FIG. 1a is a front view of a magnetic head 4 in which a core 2 and a core support 3 are assembled in a case 1 manufactured by the manufacturing method according to the present invention. The magnetic tape 5 (dotted chain line) shown in FIG. 1a slides on the core 2, part of the core support 3, and part of the sliding plate 6 in the magnetic head 4.

FIG. 1b shows a sectional view of FIG. 1a taken along dashed lines A and A' and viewed in the direction of arrow B. FIG. In FIG. 1b, the core support 3 is inserted into the case 1, and the left end of the core support 3 is exposed to the outside of the case through an opening 1a provided in the case. The core support 3 is pressed and held inside the case 1 by the spring 7. FIG. 2a is a perspective view of the case 1 immediately before a press-fitting process (described later) in a method of manufacturing the case 1 used in the magnetic head 4 shown in FIGS. 1a and 1b. In FIG. 2a, case 1 uses permalloy, alperm, or the like as a high magnetic permeability material that is easy to draw. The case 1 has an opening 1b for fitting the sliding plate 6 and an opening 1a for exposing a part of the core support 3 (shown in FIGS. 1a and b) to the outside of the case 1. 1a and 1b are connected to form one hole as shown in FIG. 2a. The sliding plate 6 is made of a material harder than the case 1, for example, hard permalloy (case 1 is made of 7-8 permalloy, 4-
5 permalloy) is press-fitted into the opening 1b provided in the case 1 using Sendust (when the case 1 is Alperm) or the like (press-fitting process). Next, sliding plate 6
When the press-fitted case 1 is heated to 1000° C. to 1200° C., the contact portions of the opening 1b of the case 1 and the sliding plate 6, which are exerting pressure on each other, are welded together (heating step). When cooling is performed after the heating process (cooling process), the sliding plate 6 is heated as shown in FIG. 2b.
can be welded to obtain the case 1 having the opening 1a. It can also be used in the magnetic head 4 shown in FIGS. 1a and 1b. If the core 2 shown in Fig. 1 a and b is made of hard permalloy, a case with a hard permalloy sliding plate welded is used, and if the core 2 is made of sendust, a case with a sendust sliding plate welded is used. It is desirable to use each. In this way, the core 2 and the sliding plate 6 will wear out evenly as the tape 5 slides, and the deterioration of the output characteristics of the magnetic head can be reduced, resulting in a long-life magnetic head. .

[Brief explanation of the drawing]

FIG. 1a is a front view of a magnetic head using a case manufactured by the manufacturing method according to the present invention, FIG. 1b is a cross-sectional view of FIG. FIG. 2A is a perspective view of the case showing the state immediately before the press-fitting step of the manufacturing method according to the present invention, and FIG. 2B is a perspective view of the case showing the state after the cooling step of the manufacturing method according to the present invention. In the figure, 1... Case, 1a, 1b... Opening, 2... Core, 3... Core support, 4...
magnetic head, 5... magnetic tape, 6... sliding plate,
7...Spring.

Claims (1)

[Claims] 1. A second member having higher hardness than the first member is inserted into the opening provided in the first member for enclosing the magnetic head.
a press-fitting step of press-fitting the members, a heating step of heating the first and second members that have gone through the press-fitting step to 1000°C or more, and a cooling step of cooling the first and second members that have gone through the heating step. The press-fitted second
A method of manufacturing a magnetic head component, characterized in that the member is welded to an opening provided in the first member.