JPS6286528A - Floating type magnetic head - Google Patents

Abstract

PURPOSE:To improve a CSS resistance characteristic and to simplify the manufacturing process of titled head by building a gap in a sliding rail. CONSTITUTION:At the edge part of a sliding rail 1b of at least one side sliding rail 1b out of sliding rails 1b and 1b provided at both sides, in the terminal of a track width Tw, a metallic magnetic body thin film (not shown in the figure) is formed on facing surfaces 1a and 2a of the gap between one side non-magnetic body core 1 where grooves 3 and 3 are provided and other non- magnetic body core 2 where the same grooves 4 and 4 are provided at the position opposite to the grooves 3 and 3. Thereafter, the non-magnetic film to regulate the gap length is formed, gap facing surfaces 1a and 2a sides are close, a glass 5a is filled respectively between the gap facing surfaces 1a and 1a and in facing grooves 3 and 4, and both non-magnetic body cores 1 and 2 are junctioned.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flying magnetic head used in a magnetic disk device or the like.

[Conventional technology]

Conventionally, as floating magnetic heads used in magnetic disk drives and the like, Winchester type heads (FIG. 2), thin film heads (FIG. 3), combo-knot heads (FIG. 4), etc. have been used.

These magnetic recording devices are often used for large-capacity recording systems and data files, and are required to have improved reliability.

In recent years, with the increase in the density of magnetic recording, efforts have been made to increase the saturation magnetic flux density and coercive force of media.

Along with this, a composite a-type head combining a metal magnetic film and 7-elite has been proposed and is being studied as a head for 8 mm VTRs and the like. This is no exception for magnetic disk drives.

And as an evaluation method to show the performance of these floating magnetic heads! fCS has S characteristics.

In other words, when the rotation of the magnetic disk starts or stops, the magnetic head repeatedly floats and contacts the surface of the magnetic disk, but as the number of repetitions increases,
A phenomenon occurs in which the magnetic head scratches or gets caught on the magnetic disk surface, causing damage to the magnetic disk surface or the magnetic head. There is an evaluation method called C8S resistance that indicates the frequency with which this phenomenon occurs.

However, in order to solve the above problems, it is necessary to
It is necessary to improve the S properties.

Furthermore, magnetic disk gtII! As magnetic heads are widely used, there is a demand for lower prices of magnetic heads, and consideration must be given to simplifying the steps involved in manufacturing magnetic heads.

[Problem that the invention seeks to solve]

When considered from the viewpoint of responding to higher density, conventional ferrite heads have low saturation magnetic flux density, resulting in insufficient writing to the medium. Therefore, there is nothing other than thin-film heads that have sufficient electromagnetic conversion characteristics for high-He media for high-density recording.

Furthermore, for Winchester type heads and component type heads, a composite head of a metal magnetic film and ferrite as mentioned above is being considered, but it has the disadvantage of requiring many manufacturing steps due to its structure. There is.

In addition, in a composite head, the output voltage during reading becomes frequency dependent due to the difference in magnetic permeability between the magnetic core carrier and the metal magnetic film or due to the pseudo-earth effect, which requires countermeasures.

Furthermore, from the point of view of reliability, among conventional magnetic heads, the Winchester type head has a magnetic Since the helad 2C is protruding and the thin film head is made of multilayered films as shown in Figure 3, it is fundamentally difficult to improve C8S resistance due to its structure. be.

Also, although the composite head has the advantage of improving C8S resistance, it has a structure in which the magnetic head chip 2C is embedded in the slider 1b, so it has a 1.5! ! It has the disadvantage of requiring many manufacturing steps.

Furthermore, the electromagnetic conversion characteristic, which is the most important PI3 function for a magnetic head, is still insufficient for anything other than a thin film head.

An object of the present invention is to provide a floating magnetic head that has improved electromagnetic conversion characteristics and C8S resistance, is easy to manufacture, and has excellent mass productivity.

[Means for solving problems]

As an embodiment of the floating magnetic head of the present invention is shown in FIG. 1, a track width T One non-magnetic core 1 is provided with grooves 3.3 spaced apart from each other, and the other non-magnetic core 2 is provided with similar grooves 4.4 at positions facing the grooves 3.3. Between the metal magnetic films a (not shown) on the gap facing surfaces 1a and 2a
is formed, and then a non-magnetic film is formed for regulating the gear size, and the gap facing surfaces 1a and 2a are brought close to each other, so that between the gap facing surfaces 1a and 2a and the facing 2J.
3.4 is filled with glass 5a, and both non-magnetic cores 1.2 are joined.

[For production]

With the above structure, the magnetic circuit can be made N! using only the metal magnetic thin film. This reduces the pseudo-gap effect, making it easier to counteract the frequency characteristics compared to a composite head.Also, since the gap is buried within the slide rail, C8S resistance is improved. It will improve.

Further, since both non-magnetic cores, whose track widths have been determined by forming grooves in advance, are simply joined by positive filling, manufacturing is extremely easy with fewer steps.

〔Example〕

Hereinafter, an example of the manufacturing process of the floating magnetic head of the present invention will be explained in the fifth section.
This will be explained with reference to Figures (a) to (e).

(Example 1) First, non-magnetic core carriers IA and 2A of a predetermined shape (in this example, one is ■-shaped and the other is C-shaped with a longitudinal groove 2b) with mirror-finished gap facing surfaces 1a and 2a are manufactured. do(
f55 (a)), the non-magnetic material is T1Ca
0i Ceramic (α= 108 X 10-' de
g-') was used.

Next, grooves 3.3 and 4.4 for determining the track @Tw are formed in the upper corners of the gap facing surfaces 1a, 2a of the non-magnetic core carriers IA, 2A.
(in this example, they are processed obliquely), and a metal magnetic thin film (not shown) is formed on the gap facing surfaces 1a and 2a (FIG. 5(b)).

The gap-opposing surfaces 1a and 2a of the non-magnetic core carriers 1Δ and 2A thus formed are placed close to each other (FIG. 5(c)).
, a softening temperature of 350°C and a thermal expansion coefficient of 11 in the longitudinal groove 2b.
5 x 10-'deg-' lead-silicate glass rod 5
5(d)), the glass rod 5 is melted by heat treatment held at 460° C. for 30 minutes, and the molten glass 5a flows between the grooves 3.4 to fill them, and the longitudinal grooves 2b Glass 5a is also attached to the inside for reinforcement, and the non-magnetic core carriers IA and 2A are joined to form a block (f5
Figure 5(e)).

After that, by cutting the thus joined blocks and machining them into a predetermined shape, a plurality of floating magnetic heads (three in this example) as shown in Figure R51 can be made from one block. It is manufactured.

(Example 2) Furthermore, although it is a similar manufacturing process, a; 130 X 1
When using MnNi0-based nonmagnetic material of 0-' dcg-I and using Fe-Al-8i-based alloy as the metal magnetic thin film, the glass rod has a softening temperature of 450°C and a thermal expansion coefficient of 130XI.
Using O-'deg-' lead-silicate glass, 6
A similar bonded block of a magnetic head can be formed by performing a heat treatment at 00° C. for 30 minutes to form a bonded block.

〔Effect of the invention〕

As described above, according to the present invention, since the gap portion is built into the slide rail, C8S resistance is improved, and one or more heads can be manufactured by one bonding process, which makes manufacturing easier. The process is simplified and production is highly efficient.Furthermore, a thin metal magnetic film is formed on the surface facing the gap of the non-magnetic core, and the magnetic circuit is constructed only with this film, resulting in good output voltage frequency characteristics. It is something that

In addition, by forming gap sections on both slide rails with the same Tw processing as described above, it is possible to use magnetic heads of the same shape on both the upper and lower sides, and the 2N1 cores can be manufactured with one core.

Furthermore, by switching between the gaps on both sides and operating the disc, the usage efficiency of the disc can be improved.

[Brief explanation of drawings]

fjS1 is a perspective view showing one embodiment of the present invention, No. 2.3
．． Figure 4 is a perspective view of a conventional floating magnetic head, and Figure 5 (a)
), (b), (c), (d), and (m) are perspective views showing an example of the manufacturing process of the floating magnetic head of the present invention. 1.2: non-magnetic core, la, 2a: gap facing surface, 2b: longitudinal groove, 3.4: groove, 5: ff
Last stick, 5a:〃Last agent Patent attorney Takashi Honma I Dutch Figure 5

Claims (1)

[Claims] One of the non-magnetic cores is provided with a groove at the end of the slide rail on at least one side of the slide rails provided on both sides with an interval of track width, and a similar groove is provided at a position opposite to the groove. A metal magnetic thin film is formed on each of the surfaces facing the gap with the other non-magnetic core provided with the gap, and the gap facing surfaces are brought close to each other, and glass is filled between the gap facing surfaces and in the opposing groove. A floating magnetic head characterized in that both of the non-magnetic cores are joined.