JPS6273410A - Magnetic head - Google Patents

Abstract

PURPOSE:To facilitate the work bonding a lead to a terminal part by using an intermediate terminal part of two adjacent thin film magnetic heads in common so as to increase the shape of each terminal part. CONSTITUTION:The intermeditate terminal part 6 of a coil 3 of two thin film magnetic heads is used in common to increase the shape of a terminal part 5 and the intermediate terminal part 6 and it is possible to widen the interval of each terminal part. Thus, the lead wire bonding to the terminal part is facilitated to quicken and to automate the bonding. The automation of the lead bonding is facilitated because of the convenience of using one of the two thin film magnetic heads for the recording and reproduction by forming the terminal part 5 to be at point symmetry to the utmost around the intermediate terminal part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thin film magnetic head using IC technology, and particularly to a terminal portion of a head coil.

[Summary of the invention]

In the terminal portion of a thin film magnetic head having a coil intermediate terminal, the intermediate terminal portions of two adjacent thin film magnetic heads are made common, so that the shape of each terminal portion can be enlarged and the lead wire can be connected to the terminal. This facilitates the work of joining lead wires and increases the tolerance for joining position accuracy, contributing to automation of lead wire joining work.

[Prior art]

As the recording density of magnetic disk drives increases year by year, the recording width per spindle of magnetic recording media decreases, resulting in a reduction in reproduction output.

As a countermeasure to this problem, for example, a method of increasing the number of coil turns of the magnetic head can be considered, but this also results in an increase in inductance. Therefore, when the number of coil turns of the ferrite core is increased, the resonant frequency decreases due to the long magnetic path length.
Undesirable for high frequency recording and reproduction.

From this point of view, thin-film magnetic heads, which are an application of semiconductor manufacturing technology, have recently been attracting attention. The thin film magnetic head allows miniaturization of the magnetic pole portion and is suitable for increasing the number of turns of the coil.

[Problems and Objects to be Solved by the Invention] However, in the thin film magnetic head described above, since the coil is a thin film, a terminal portion for joining a lead wire must be provided near the magnetic pole.

Since the driving method is simple and the inductance can be reduced by using half the coil during recording as during playback, a three-terminal coil connection method as shown in Figure 2 is often used. . In concrete use, the intermediate terminal of the head coil is connected to the ground 8, and the head 7 is driven by using transistors 9 and 10 alternately during recording.

Also, no intermediate terminal is used during playback. The general arrangement of such a three-terminal coil thin film magnetic head on a slider is as shown in FIG. It is.

Incidentally, as the recording density increases year by year, there is also a strong demand for smaller diameter magnetic disks. One of the problems when reducing the diameter of a magnetic disk is the ability of a slider to follow the magnetic disk. In Figure 3, the current size of the slider is width W = 5 to 5.5 (m) and height E.
= approximately 0.8 to 0.95 (m), and the sizes of the terminal portion 5 and the intermediate terminal portion 6 are limited, particularly due to constraints on the slider height. One way to improve the tracking performance of the slider is to reduce the inertial mass of the slider. From this point of view, it would be better to make the slider smaller, but the length and width W of the slider cannot be made much smaller due to restrictions on the gas lubrication surface of the slider. For this reason, the slider height H has to be reduced, and the terminal portion 5
Also, the size of the intermediate terminal portion 6 is reduced, and there is a problem that high precision lead wire joining is required.

Therefore, the present invention aims to solve these problems.
Its purpose is to join lead wires and provide different coil terminals and intermediate terminals.

[Means for solving problems]

The thin film magnetic head of the present invention is characterized in that two adjacent coils have a common intermediate terminal portion.

[Effect]

According to the above-described structure of the present invention, the coil terminal portion and the intermediate terminal portion can be made large, and the intervals between the respective terminals are widened, so that lead wire joining becomes easy.

〔Example〕

FIG. 1 is a perspective view of an embodiment of the present invention, in which magnetic poles 2 of a thin film magnetic head are mounted on a slider 1. The generation method and detailed explanation of the coils 3 generated one set at a time are not directly related to the present invention, and will therefore be omitted here.

The order in which the coil lead wires 4 are formed varies depending on the arrangement of the coils and how the intermediate terminals are taken out. The subsequent manufacturing process of the thin film magnetic head is as follows. In the figure, one slider K is shown for convenience. In FIG. 4, the substrate 11
There is an insulating film 12 on top, and a coil lead-out line 4 is formed thereon. Next, as shown in FIG. 5, all but the necessary terminal portions and intermediate terminal portions are covered with a cover film 13 such as resist. Then, the terminal portion 5 and intermediate terminal portion 6 are formed by plating or the like, the cover film 13t is removed, and the passivation layer 114t is formed, as shown in FIG. Now I
The manufacturing of a thin film magnetic head using the C technology is completed, and after that it is machined into a slider shape and becomes a head chip as shown in FIG.

By making the intermediate terminal portion 6 of the coil 3 of two thin-film magnetic heads common as shown in FIG. 1, the shapes of the terminal portion 5 and the intermediate terminal portion 6 become larger, and the intervals between the respective terminal portions can be widened. This makes it easier to connect the lead wires to the terminals. Therefore, it is possible to speed up and automate the joining work.

Note that the arrangement of the terminal section 5 and the intermediate terminal section 6 is as follows.
If the terminal part 5 is as close to point symmetry as possible with
For the convenience of using only one of the two thin-film magnetic heads for recording and reproduction, it is easy to automate lead wire joining, but a slight misalignment is not a problem.

In addition, since the intermediate terminal portion is originally used as a ground, even if one intermediate terminal portion is changed to a different terminal, no problem will arise in terms of recording and reproduction.

〔Effect of the invention〕

As described above, according to the present invention, by making the coil intermediate terminal part common, the shapes of the terminal part and the intermediate terminal part can be enlarged, and the intervals between them are widened, so that the lead wires to each terminal part can be made large. This has the effect of making joining easier.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the thin film magnetic head slider of the present invention. Figure 2 is a drive circuit diagram of a three-terminal coil magnetic head. Figure 3 is a plan view of a conventional thin-film magnetic head slider. Figure 4 is a cross-sectional view after forming the coil lead line (A in Figure 1).
Figure 5 is a cross-sectional view after forming the cover film (in Figure 1 - part) Figure 6 is a cross-sectional view after forming the terminal part and intermediate terminal part (A-AI in Figure 1). Fig. 7 shows a cross-sectional section (A-AI section in Fig. 1) after removing the cover film and forming the passivation film 01...Slider 2...Magnetic pole 5... ... Coil 4 ... Coil lead-out wire 5 ... Terminal section 6 ... Intermediate terminal section 7 ... Magnetic head 8 ... Intermediate terminal 9.10... Transistor 11... Substrate 12... Insulating film 13... Cover film 14... Passivation film or more

Claims (1)

[Claims] A magnetic head characterized in that at least a magnetic film, a coil film, an insulating film, a coil terminal portion, a coil intermediate terminal portion, etc. are laminated on a substrate, and at least two or more coil intermediate terminal portions are shared.