JPH02240814A - thin film magnetic head - Google Patents

Abstract

PURPOSE:To obtain the thin-film magnetic head having good sliding performance by disposing sliding members in such a manner that the magnetic gap position of the head is nearly the axis of symmetry. CONSTITUTION:The sliding members 1,2, magnetic core 3 and magnetic gap 4 of the thin-film magnetic head are provided and further, the outside shape curve of the sliding surface of the magnetic head is continuous with respect to the magnetic recording medium traveling direction 8 of this magnetic head. In addition, the head has the sliding member 5 disposed with the magnetic gap 4 so as to be nearly the axis of symmetry. The thin-film magnetic head chip 6 and the sliding member 5 constitute the continuous outside shape curve and the magnetic recording medium 11 slides thereon. The magnetic head having the magnetic gap 4 in the position asymmetrical with the traveling direction of the magnetic recording medium is disposed with such sliding member 5, the outside shape curve of which in the traveling direction of the sliding surface thereof is continuous, in such a manner that the position of the magnetic gap 4 is nearly the axis of symmetry with respect to the traveling direction of the magnetic recording medium 11. The magnetic head which obviates the deterioration in the sliding performance by the adhesive layer for adhering a protective plate and the deterioration in the performance of the magnetic core 3 by the temp. at the time of adhesion is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin film magnetic head, and particularly to a head arrangement of a thin film magnetic head that has good sliding performance and is suitable for a helical scan type VTR.

[Prior Art] As described in Japanese Patent Application Laid-Open No. 61-24007, a conventional thin film magnetic head is manufactured by forming a protective insulating thin film on the head element portion of the thin film magnetic head, and further forming the protective insulating layer into a planar shape. A continuous sliding surface was created by processing the protective plate into resin or glass and bonding it to resin or glass.

In addition, in conventional multi-element magnetic heads, an auxiliary chip for preventing magnetic tape from sagging is installed near the middle of adjacent head chips, as described in Published Utility Model Publication No. 61-114510, to prevent discontinuous sliding. Products have been proposed that have good sliding performance on both surfaces.

[Problem to be solved by the invention]

However, in the above conventional technology that creates a continuous sliding surface,
When the protective plate is bonded with resin, the protective plate moves because the resin in the adhesive layer expands or contracts due to moisture absorption, etc., and the continuous sliding surface becomes discontinuous, deteriorating the sliding performance.

Furthermore, when bonding the protective plate to glass, no consideration has been given to deterioration of the characteristics of the magnetic head element due to the bonding temperature or peeling off of the protection due to insufficient bonding strength when low melting point glass is used.

In addition, in order to apply the conventional technology that has good sliding performance even on discontinuous sliding surfaces to thin film magnetic heads, the above-mentioned protection plate adhesion technology is required. If this is applied, the above-mentioned problem of adhesion of the protective plate will similarly occur.

An object of the present invention is to provide a thin film magnetic head in which the magnetic gap is asymmetrical with respect to the running direction of a magnetic recording medium, and which can provide good sliding performance even if a sliding member is provided that is discontinuous with the sliding surface of the magnetic head. The purpose is to provide the head.

[Means to solve the problem]

The above object is a thin film magnetic head in which the magnetic gap is located at an asymmetric position with respect to the running direction of the magnetic recording medium, and in order to have a single gap configuration, the external curve in the running direction with the sliding surface of the magnetic head is continuous. This is achieved by arranging a sliding member such that the magnetic gap position is approximately on the axis of symmetry with respect to the running direction of the magnetic recording medium.

In addition, in order to obtain a multi-gap configuration, the thin-film magnetic head and the sliding member must be connected so that the magnetic gap positions of the plurality of thin-film magnetic heads are substantially symmetrical with respect to the apex position of the multi-element thin-film magnetic head. This is achieved by arranging.

[Effect]

The magnetic recording medium travels along the outline of the continuous sliding surface of the thin-film magnetic head, and does not enter the discontinuous portion between the sliding surface of the thin-film magnetic head and the sliding member. It does not damage the recording medium, and wear progresses almost evenly.

Sliding performance does not deteriorate even after wear progresses.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is a front view of a first embodiment of the thin-film magnetic head of the present invention, viewed from the sliding surface side of a magnetic recording medium.

1.2 is the sliding member of the thin film magnetic head, 3 is the magnetic core, 4 is the sliding member of the thin film magnetic head;
5 is a magnetic gap, and 5 is arranged such that the outer curve of the sliding surface of the thin film magnetic head is continuous with respect to the magnetic recording medium running direction 8 of the thin film magnetic head, and the magnetic gap 4 is arranged so as to be approximately an axis of symmetry. The sliding member shown in FIG. Also,
7 is Herad base.

FIG. 2 is a plan view of the thin film magnetic head, showing continuous external curves of the thin film magnetic head 6 and the sliding member 5, and 10 is a magnetic recording medium.

By configuring the thin film magnetic head as described above, a gap is created between the thin film magnetic head chip 6 and the sliding member 5. If the width of this gap is 500 μm or less, the thin film magnetic head chip 6 Also, the end of the sliding member 5 on the gap side does not damage the magnetic recording medium.

FIG. 3 shows a second embodiment of the present invention, and is a front view seen from the sliding surface side.

The shape of the thin film magnetic helad tip 6 is the same as that of the first embodiment, but the width of the sliding member 5 on the gap side is different.

It is longer than the width on the opposite side of the gap. By adopting the above configuration, the initial contact area between the magnetic recording medium and the moving member 5 increases from 0 to a constant value, so that stable sliding performance can be obtained. In this embodiment, only the shape of the end of the sliding member 5 on the opposite side to the gap is shown, but the shape of the end of the thin film magnetic helad tip 6 on the side opposite to the gap can also be processed as described above. It is clear that similar effects can be obtained.

Also in this example, the gap width was 500 μm or less.

FIG. 4 shows a third embodiment of the present invention, which is a front view seen from the sliding surface side, and FIG. 5 is a plan view thereof.

In recent VTRs, the recording band has expanded, so the band-divided symbols can be divided into bands so that their recording patterns do not overlap.
A method is adopted in which recording is performed almost simultaneously using a plurality of magnetic heads arranged with gap intervals and track steps.

This embodiment shows a multi-element thin film magnetic head compatible with the above-mentioned VTR. Vertex 1 of a multi-element thin film magnetic head consisting of multiple thin film magnetic head chips
The gear position f of a plurality of thin film magnetic heads with respect to 0
The thin film magnetic head chip 6a is arranged so that i9a and 9b are approximately symmetrical.

6b and the sliding member 5 are arranged. Further, the outer shape curve of the multi-element gIRSM head in the traveling direction of the magnetic recording medium is a continuous curve.

A multi-element thin film magnetic head is configured as described above, and further,
By setting the magnetic gap spacing and track height to desired values, the magnetic recording medium travels following the external curve of the multi-element thin film magnetic head, so it has sliding performance that does not damage the recording medium even in gaps. A multi-element thin film magnetic head with good quality can be provided. In this embodiment, the thin-film magnetic Rad chips 6a and 6b are configured to slide in the same direction, but as in the fourth embodiment shown in FIGS. Magnetic head chips 6a, 6
It is clear that the same effect can be obtained even if b is configured to be in the opposite sliding direction.

〔Effect of the invention〕

As described above, the present invention provides a thin film magnetic head that has good sliding performance without deterioration in sliding performance due to the adhesive layer for adhering the protective plate or deterioration in magnetic core performance due to the temperature at the time of adhesion. can do.

[Brief explanation of drawings]

FIG. 1 is a front view of the first embodiment of the present invention, FIG. 2 is a plan view of the first embodiment, and FIG. 3 is a front view of the second embodiment.
4 is a front view of the third embodiment, FIG. 5 is a plan view of FIG. 4, FIG. 6 is a front view of the fourth embodiment, and FIG. 7 is a plan view of FIG. 6. 1.2.5...Sliding member, 3...Magnetic core, 4...
- Magnetic gap, 6... Head element, 7... Head base, 8... Recording medium running direction, 9... Head gap position, 10... Head apex position, 11... Magnetic recording medium , 12...Sliding member end. Hayabusa l Figure 2 Figure ＼7 and ″ゝ＼, /-4W moving member 2-ff Inspector property 3-fi whispering 2-A--, pounding; knob 5-sliding (1 year old 6-J magnetic transfer) Element 7 --- Herad base 8 --- Yurenban inner material direction --- Kui Dogi Rose 7° mold diagram collection - Illustrated collection of illustrations

Claims (1)

[Claims] 1. A thin film magnetic head in which the magnetic gap is located at an asymmetric position with respect to the running direction of the magnetic recording medium, characterized in that the sliding member is arranged so that the magnetic gap position of the thin film magnetic head is approximately on the axis of symmetry. Thin film magnetic head.