JPS58118017A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the S/N due to external noises and to realize the miniaturization and high reliability of a recording/reproducing system, by forming a thin film magnetic head and an integration circuit element including a recording/reproducing circuit on a substrate of a nonmagnetic material. CONSTITUTION:A thin film head 302 is formed on a slider 301 of a nonmagnetic material, and a recording/reproducing integration circuit element 303 is provided on the slider 301 and at a place near the head 302. The element 303 has a signal terminal 304. The conductive magnetic materials of high permeability are shown by 401 and 403 respectively. A conductive metallic film 405 forms a winding part and a recording/reproducing integration circuit element 402 is set on a nonmagnetic substrate 401 and connected to the winding part of the head via a lead wire 406. As a result, the length of a connecting line between the head and the recording/reproducing circuit is extremely reduced to improve greatly the S/N. Thus the size and weight can be greatly reduced for a recording/reproducing system.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head in which an integrated circuit including a recording/reproducing circuit is disposed on a substrate on which a thin film head is formed.

As an alternative to magnetic heads that were manufactured by forming a core part using mechanical processing methods on ferrite or metal, winding a winding wire in a winding groove, and inserting a spacer into the gap, Using techniques such as vapor deposition, sputtering, electrodeposition, and photoetching, the core part, winding part, and air gap part are made isometrically, and the magnetic head C and below are made of integrated thin films. A thin-film head) has been proposed and put into practical use. Thin film heads allow for miniaturization and eliminate difficulties in winding the windings. Furthermore, since there is little variation, evaluation of recording and playback becomes easier. It has many advantages such as being manufactured at low production cost. Actually, the thin film head 102 is formed on the slider 101 as shown in FIG. However, when attempting to record and reproduce using such a magnetic head in an actual magnetic recording and reproducing device,
Conventionally, it is necessary to separately prepare an electric circuit or an integrated circuit including an electric circuit (hereinafter referred to as a recording and reproducing circuit) necessary for recording and reproducing, and connect it to the winding section of the head using a conductor 103 or the like. Because the distance between the Ht head and the recording/reproducing circuit becomes long, external noise is likely to be picked up by the conductive wire section to which minute signals detected by the head are added, which leads to deterioration of the reproduced waveform and signal-to-noise ratio. This causes an increase in the number of final bit errors, etc.

In order to avoid this, as shown in FIG.
5, a conductive wire 203 is provided for electrical connection with the head 201 mounted on the slider.
There are some examples of shortening the length to prevent external noise from entering the signals detected from the disks 206 to 201.
The length of the connection line is so long that it cannot be ignored, and the connection line inevitably tends to pick up external noise. To this end, measures such as shielding the connection edges are required.

The present invention has been made to eliminate such drawbacks, and its purpose is to solve the deterioration of the signal-to-noise ratio due to the ingress of external noise into the connection line, and to connect the magnetic head and H-pi recording/reproducing circuit (hereinafter referred to as the recording/reproducing system). ) provides a method for realizing smaller size, higher reliability, and lighter weight.

Hereinafter, the present invention will be explained in detail based on Examples. Third
The figure is an example of an overview diagram showing the basic principle structure of the magnetic head according to the present invention. In FIG. 3, 301 is a slider made by processing a substrate of non-magnetic material, 302 is a thin film head formed on #1301, and 303 is placed on 301 near 302. The recording/reproducing integrated circuit element 3o4 is a signal terminal of 303, and 3o3 is fixed on the base material 301 with an adhesive or the like. Figure 4 is a partially enlarged view of 302 and 303 in Figure 3, where 401 and 403 are conductive high permeability magnetic materials such as permalloy, and 4o5 is a conductive material such as gold forming the winding part. 4o2 is a non-magnetic substrate 40
An integrated circuit element for recording and reproducing is placed on the head 1 and fixed with a liquid adhesive or the like, and is connected to the winding portion of the head by a conductive wire 406. Figure 5 shows the α-bj group and c of Figure 4.
-d jjJj is an example of a cross-sectional view. In FIG. 5, 502 is a cross-sectional view taken along line a-b. For example, 501 is a substrate made of a non-magnetic material such as barium titanate, and 504 is a conductive high permeability thin film J 505 , 506 and 512 such as permalloy. is an insulating layer made of silicon dioxide, etc., 507.508
．． 509.51O and 511 are conductive metal films such as gold.

Reference numeral 503 is a sectional view taken along the line c-d, and 513 is 4- An integrated circuit element including a recording/reproducing circuit is fixed on the substrate 501 with an adhesive or the like. 514 is a conductive metal film made of aluminum or copper, and is connected to the winding part of the head part.

In this way, if an integrated 1Gl path element including a recording/reproducing circuit is placed near the thin-film head on the substrate on which the thin-film head is formed, the head and recording/reproducing circuit, which is a major cause of picking up external noise, can be disposed. Since the distance between the connecting lines can be significantly reduced, external noise is less likely to be mixed into the detection signal.

Therefore, a significant improvement in the signal-to-noise ratio can be expected.

Furthermore, by integrating the recording/reproducing circuit and the head, which were conventionally separate, the recording/reproducing system can be significantly reduced in size and weight.

Although the head shown in FIG. 3 has been described using a hard disk head as an example, the magnetic head having the structure according to the present invention is also effective for flexible disks such as floppy disks. Examples are shown in Figure 6 and Part 7. In FIG. 6, an integrated circuit element including a recording/reproducing circuit is placed on a substrate 5- on which a thin-film head is formed as described above, and is processed into a shape 601, and 602 is a thin-film head. A head, 603 is an integrated circuit element, and 604 is a connection line to an external interface circuit, etc. Figure 7 shows the 6th
A substrate 701 having the same shape as 601 in the figure is bonded to 601, and if this is mounted on a slider, it can also be used for flexible disks.

As described above, the magnetic head according to the present invention has advantages in that external noise that enters between the head and the recording/reproducing circuit is reduced, the signal-to-noise ratio is improved, and the recording/reproducing system is made smaller and lighter. It has desirable properties as a magnetic head.

[Brief explanation of drawings]

FIG. 1 shows the overall structure of a thin film head mounted on a conventional slider. FIG. 2 shows that an integrated recording/reproducing circuit is mounted on an arm and connected to the magnetic head shown in FIG. 1. FIG. 3 shows an example of the structure of a magnetic head according to the present invention. FIG. 4 shows an enlarged view of a part of the integrated circuit module including the #I film head and the recording/reproducing circuit shown in FIG. FIG. 5 schematically represents a part of the cross-sectional view of FIG. 4. FIGS. 6 and 7 show a magnetic head obtained by processing the magnetic head of the present invention into a different shape. 102.302,502,602...thin film head 101
．． 201, 301...Slider 202, 303, 402, 503, 603, Red concentrated recording and reproducing circuit 103, 203... Connecting line between the thin film head and the recording and reproducing circuit Applicant: Suwa Seikosha Co., Ltd. Agent Person Patent Attorney Mogami 7- Figure 3 Figure 2

Claims (1)

[Claims] A magnetic head characterized in that a thin film magnetic head is formed on a substrate made of a non-magnetic material, and an integrated circuit element including a recording/reproducing circuit is arranged on the substrate.