JPH0660355A - Magnetic head - Google Patents

Abstract

PURPOSE:To facilitate the dealing with the trend toward the smaller size and smaller thickness of the magnetic head by preventing the degradation in the joining strength of a gap for recording and reproducing. CONSTITUTION:A small C type core bar 2 formed by laminating a nonmagnetic substrate and magnetic thin film 5 and a large C type core bar (or I type core bar) 1 formed by lamination in the same manner are joined to have a prescribed gap length and the regulation of a winding core width A is executed in a depth range of not arriving at a joint part 3 in such a manner that the magnetic thin film part 5 exists at the center. As a result, the degradation in the joining strength of the gap for recording and reproducing is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a hard disk drive of magnetic recording devices.

[0002]

2. Description of the Related Art FIG. 6 is a structural view of a monolithic type Winchester head which is most often used in a hard disk drive device. (1) is an overall plan view and (2) is (1).
FIG. 3 is an enlarged plan view of an essential part of FIG. 3, and (3) is a side view of (2).

As shown in FIG. 6, a large C-type (or I-type) core bar 1 and a small C-type core bar 2 are joined at a joining portion 3, and a gap 4 for recording and reproducing having a predetermined gap length is provided at this joining portion. Are formed. The large and small C-shaped core bars have a winding core width A regulated at a winding portion for winding (not shown), and the winding core width A further regulates a track width B. Has been processed. As shown in FIGS. 6 (1) and 6 (2), the winding core width regulation is a range from the small C-shaped core bar 2 to the large C-shaped core bar 1 beyond the joint portion 3 (joint surface).
Removal processing is performed up to (removal range C shown by the broken line in FIG. 6 (1)).

[0004]

The above-described monolithic type Winchester head shown in FIG. 6 is composed of two large and small C-shaped core bars 1 and 2 made of a soft magnetic material. Therefore, the joint portion 3 other than the track width B, that is, the gap 4 must not be on the same plane as the track width gap portion. The reason is that if there is a junction 3 in a portion other than the track width B, that portion also has the same function as the recording / reproducing gap 4, and recording / reproducing is performed also in a portion other than the originally required track width portion. Therefore, in the conventional magnetic head, the joining portion 3 other than the gap 4 portion, which is necessary in the winding core width regulation step, has to be removed.

Therefore, two large and small C-shaped core bars 1 and 2 are provided.
Since the winding core width is restricted at the portion of the joining portion 3 where is joined, there is a problem that the joining area becomes small and the joining strength decreases.

In particular, the recent trend toward smaller and thinner hard disk drive devices is strongly required for the outer dimensions of the magnetic heads used therein, and there is a strong market demand for smaller and thinner magnetic heads. The reduction in size and thickness of the magnetic head leads to a reduction in the above-mentioned joining area, and the reduction in the joining strength causes problems such as peeling of the joint in the winding work process and peeling of the joint due to impact.

The present invention is directed to miniaturization of the above magnetic head,
It is an object of the present invention to eliminate the decrease in the bonding strength due to the decrease in the bonding area at the bonding portion of the large and small C-shaped core bars due to the reduction in thickness.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a core block obtained by joining a C-type core bar formed by laminating a magnetic thin film and a non-magnetic substrate, and a C-type or I-type core bar formed in the same manner. And the winding core width is formed in a depth range that does not reach the joining portion, by the processing of winding core width regulation performed for winding the portion including the magnetic thin film. And

[0009]

Since the present invention is a laminated type magnetic head in which magnetic thin films are laminated on a non-magnetic substrate, the only portion of the joining portion which originally functions as recording and reproducing is the joining portion of two magnetic thin films. Therefore, in the gap (joint portion) formed by the two large and small C-shaped core bars, only the magnetic thin film portion serves as the recording and reproducing portions.
In the winding core width regulation step as shown in (1), the process of reaching the joint is not required, the joint area is not reduced, and the joint strength is not reduced.

[0010]

1 is a perspective view showing the structure of a magnetic head according to an embodiment of the present invention. FIG. 1 (1) is an overall perspective view, and FIG.
Shows an enlarged perspective view of the joint portion of (1).

As shown in FIG. 1, the large and small C-shaped core bars 1 and 2 are formed by laminating a magnetic thin film 5 forming a track portion and a non-magnetic substrate 6 (see FIG. 3) which will be described later. The core block is formed by the joining.

[0012] As shown in Fig. 1 (2), the processing for controlling the winding core width is performed in a depth range (D) which does not reach the joint portion 3 (see Fig. 2 (3)), where a magnetic thin film is included. A winding core width A is formed in the winding window 9 for winding the wire, and the winding core width A has a track width B made of the magnetic thin film 5.

FIG. 2 is a diagram showing FIG. 1 by an orthographic projection method. (1) is an overall plan view, (2) is a side view of (1), and (3) is (1).
As is clear from this enlarged plan view of the essential portion, the above-described processing for regulating the winding core width is performed at a depth that does not reach the joint portion 3 of the large and small C-shaped cores 1 and 2. The winding core width A is processed while leaving the range D.

The process for processing the winding core width A of the magnetic head shown in FIGS. 1 and 2 will be described below with reference to FIGS.
Will be explained.

As shown in FIG. 3A, first, as the non-magnetic substrate 6, one of ceramics such as altic, calcium titanate, and crystallized glass having a large coefficient of thermal expansion is used. As an example, a calcium titanate-based material is used for the non-magnetic substrate 6, and one surface of the non-magnetic substrate 6 has a magnetic thin film 5 of sendust, amorphous, permalloy, or the like, of which Fe-Al-Si ternary composition is used. Sputtering was performed using sendust. At this time, in order to prevent chemical reaction (diffusion) between the non-magnetic substrate 6 and sendust, sputtering is performed in advance between the non-magnetic substrate 6 and sendust using SiO ₂ as a base layer.

On the side of the non-magnetic substrate 6 opposite to the side where the magnetic thin film 5 was sputtered, an underlayer of SiO ₂ was similarly sputtered, and a glass 7 serving as an adhesive was sputtered thereon. The glass that serves as the adhesive is heated in the gap forming step that is a post-process, and therefore glass that is a material that does not soften at the gap forming temperature must be used. Therefore, in this example, a crystallized glass type glass whose glass softening temperature becomes high once it is heated and bonded is used.

As shown in FIG. 3, the magnetic thin film 5 and the glue glass 7 are sputtered on both sides of the non-magnetic substrate 6.
As shown in (2), a plurality of them are arranged and heat-bonded from both ends. In this embodiment, ten non-magnetic substrates 6 are laminated to form a laminated core block.

Next, as shown in FIG. 3C, the laminated core block is cut to obtain large and small C-shaped core bars 1 and 2. At this time, the cutting direction is perpendicular to the magnetic thin film 5 (direction of arrow E), and the large and small C-shaped core bars 1 and 2 adjacent to each other are paired 8 together. This is to prevent the positions of the magnetic thin films 5 of the large and small C-shaped core bars 1 and 2 from being displaced due to variations in thickness and inclination of the non-magnetic substrate 6.

Next, as shown in FIG. 4 (1), the cut large and small C-shaped core bars 1 and 2 are processed into the winding window 9, and the slope 10 for forming the gap depth is further processed. Are processed to make large and small C-shaped core bars 1 and 2.
The joint surface of the large and small C-shaped core bars is an important part that constitutes the gap length required for recording and reproduction, and this joint surface is mirror-finished. On the mirror-bonded joint surface, glass is sputtered as a gap spacer to obtain a predetermined gap length. This glass uses a high melting point glass that does not melt even in the heating in a later step, and a low melting point glass that melts in the gap forming step as a paste material for joining larger and smaller C-type core bars on the glass of the gap spacer. Glass is sputtered.

The glue glass and the sputtered large and small C-shaped core bars 1 and 2 for bonding with the gap spacer glass are integrated as shown in FIG. 4 (2) in the next step. At this time, the large and small C-shaped core bars 1 and 2 are further positioned so that the respective magnetic thin films are exactly aligned with each other, and the bonding glass is further inserted from the winding window 9 while the positioning is performed. By the melting of, it is more firmly integrated.

Next, as shown in FIG. 4 (3), the integrated core bar block is cut to a predetermined size from the magnetic thin film portion serving as a track portion for recording / reproducing to obtain a single magnetic head element. .

As shown in FIG. 5A, this single magnetic head element is further processed with a groove 11 to obtain a ski-like surface which determines the flying height, and an air bearing surface 12 is formed. Next, the winding core width regulation processing described with reference to FIGS. 1 and 2 is performed according to the present invention. In this processing, the processing is performed on the small C-shaped core bar 2 side so that the magnetic thin film becomes the center of the winding core, but the processing depth is within a depth range D that does not reach the junction of the large and small C-shaped core bars.

The surface of the magnetic head element which has been subjected to the ski shape processing and the winding core width regulation processing is further polished to have a predetermined gap depth dimension. The polished surface is tapered on the leading edge portion in the disc advancing direction, and trailing edge processing is performed in the disc retreating direction to obtain a completed magnetic head as shown in FIG. 5 (2).

[0024]

As described above, in the magnetic head of the present invention, the connecting portion of the large and small C-shaped core bars is not processed to regulate the winding core width, so that the joint area can be prevented from being reduced and the magnetic head can be made strong. Gap adhesive strength is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of a magnetic head according to an embodiment of the present invention.

FIG. 2 is a plan view (1) showing a side view of FIG. 1 by an orthographic projection method.
FIG. 3 is an enlarged plan view (3) of a main part of (2) and (1).

FIG. 3 is a diagram illustrating a processing process of a winding core width and the like of a magnetic head according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating a processing process of a winding core width and the like of a magnetic head according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a processing process of a winding core width and the like of a magnetic head according to an embodiment of the present invention.

FIG. 6 is a diagram showing a structure of a conventional monolithic winchester head.

[Explanation of symbols]

1 ... Large C type (I type) core bar, 2 ... Small C type core bar,
3 ... Junction part, 4 ... Recording / reproducing gap, 5 ... Magnetic thin film, 6 ... Non-magnetic substrate, 7 ... Glass, 8 ... Pairing, 9 ... Winding window, 10 ... Slope, 11 ... Groove, 12 ... Levitation Surface, A ... Winding core width, B ... Track width, C ... Removal range, D ... Depth.

Claims (1)

[Claims] 1. A core block comprising a C-type core bar formed by laminating a magnetic thin film and a non-magnetic substrate, and a C-type or I-type core bar formed by laminating the magnetic thin film. A magnetic head characterized in that a winding core width is formed in a depth range that does not reach the joining portion, by a winding core width regulation process performed to perform winding at a portion including the winding portion.