JPH0278008A - Constituting body of thin film magnetic head - Google Patents

Abstract

PURPOSE:To improve positioning accuracy and to facilitate an assembling operation by glass-joining a shielding plate to the integral structure with one thin film magnetic head. CONSTITUTION:The shielding plate 20 consisting of a conductive material is glass-joined via a spacer 19 to the side face of the protective plate 6 of the thin-film magnetic head A for recording of multiple tracks which is formed of about 20 pieces of magnetic gaps. The shielding plate 20 of this head A and the protective plate 13 of the magnetic head B for reproduction are brought into tight contact with each other. The heads A, B are butted against each other in this state and are housed into a case 15. After the heads are subjected to registration such as track registration, the head are fixed and integrated to form the head constituting body 21. The insertion and positioning into the case and the mis-registration between the two heads are effectively averted. The accuracy is thus improved and the assembling operation is facilitated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a thin film magnetic head structure for recording and reproducing, which is composed of a set of thin film magnetic heads used in computer streaming devices, etc. , relates to a structure in which the thin-film magnetic head described above is integrated with a noise-blocking shield plate interposed therebetween.

(Prior art) Thin-film magnetic heads used in streaming devices for combiators, etc. are multi-track type thin-film magnetic heads in which about 20 magnetic gaps are formed, and are integrated into sets of two for recording and playback. By doing so, a WWAS air head structure is formed.

A specific example of the thin film magnetic head (A) for recording will be described with reference to FIGS. 3 to 5.

In the figure, (1) is a substrate made of ferromagnetic material, such as ferrite, and (2) (2)... is a thin film formed with a predetermined number of tracks at a constant pitch along one edge of this substrate (1). The magnetic core (3) is a non-magnetic thin film such as StO2 interposed between the substrate (1) and the magnetic core (2), and the thickness of this thin film (3) creates a desired magnetic gap ( (4) is a spiral coil pattern formed on the non-magnetic thin film (3) and wound around the magnetic core (2). Both ends of 4) extend to the other edge of the substrate (1). (5) is an insulating pattern partially formed on the coil pattern (4), and (6) is an insulating pattern fixed on the substrate (1) to protect the magnetic core (2) and the coil pattern (4). It is a protective plate made of a non-conductive material, and the top end surface (7), which is the tape sliding surface, is curved and polished.

Next, a specific example of the thin film magnetic head (B) for reproduction will be explained with reference to FIGS. 6 and 7. In the same figure, (
8) is an insulating substrate made of ceramic, glass, etc.
9) (9)... is a magnetic head element formed into a thin film by sputtering or the like at a fixed pitch along one edge of the substrate (8) by a predetermined number of tracks. A magnetoresistive element (10) made of a ferromagnetic thin film such as permalloy;
) and external drawer leads (11) and (12) made of Au, Cu, etc., extending from both ends of the lead. The magnetoresistive element (10) of the magnetic head element (9) detects changes in the magnetic field caused by the running of the tape (not shown) on the tape sliding surface, and responds to the changes in the magnetic field with an electric resistance. The information magnetically recorded on the tape is reproduced by changing the magnetic field. (13) is the above board (8)
An insulating protection plate made of crystallized glass or the like is attached to the main part including the magnetic head element (9) on the top, and the top surface (14), which is the tape sliding surface, has a curved surface polished. There is.

The above thin film magnetic heads (A) and (B) for recording and reproducing are as follows:
It is necessary to prevent interference between the heads and block noise, so as shown in Figure 8, both thin-film magnetic heads (
A shield plate (16) made of a conductive material such as Cu is placed between A) and (B), and in this state a frame-shaped case (15) is placed.
Store and place inside. and a positioning spring (17
) and tightening screws (18) to align the two thin film magnetic heads (A) and (B) such as track alignment and tape touch adjustment, then place the adhesive in this case (15). By injecting a resin material (23), a shield plate (16) is formed between the thin film magnetic heads (A) and (B).
The thin film magnetic head (A) is fixedly mounted on the case (15) with the
(B) is attached to the head attachment part of a computer streaming device for recording and playback.

[Problem to be solved by the invention]

By the way, in the conventional thin film magnetic head structure, the thin film magnetic heads (A) and (B) for recording and reproduction are butted together with a shield plate (16) interposed between them, and in this state, the case (15) is inserted. After positioning such as track alignment, attach the case (23) with adhesive resin material (23).
15) is fixed and integrated. The above thin film magnetic head (A
) (B) Track alignment 1 etc. is difficult, especially between the 71M magnetic heads (A) and (B).
When these thin film magnetic heads (A) and (B) and a shield plate (16) made of a conductive material with a separate structure are movably inserted, the relative distance between the thin film magnetic heads (A) and (B) is Misalignment is likely to occur (and normal recording and reproduction of information becomes difficult).

SUMMARY OF THE INVENTION Accordingly, a main object of the present invention is to provide a thin film magnetic head structure that can prevent a decrease in the positioning accuracy of the thin film magnetic head due to the insertion of shield plates.

[Means to solve the problem]

As a means for achieving the above object, the present invention provides a thin film magnetic head assembly for recording and reproducing by integrating a thin film magnetic head for recording and reproducing. The present invention provides a thin film magnetic head structure in which a shield plate made of a conductive material is bonded prior to forming a magnetic head element on a substrate or molding a protection plate.

[Effect]

Glass bonding of a shield plate to either the substrate or protection plate of a thin film magnetic head prepared for recording and reproduction, prior to forming a magnetic head element on the substrate or molding the protection plate. As a result, this shield temporarily obtains a fixed fixed position.

〔Example〕

FIG. 1 is a perspective view of a thin film magnetic head according to the present invention, and FIG. 2 is a perspective view of a thin film magnetic head assembly housed in a case. In the following description, components that are the same as those of the conventional thin film magnetic head shown in FIGS. 3 to 8 are indicated by the same reference numerals, and explanations of duplicate items will be omitted.

As shown in Figures 1 and 2, two
Two thin film magnetic heads (A) and (B) are integrated into a case (1
5) The thin film magnetic head structure (2)
1) is formed.

In this embodiment, a thin film magnetic head for recording (
On the side of the Ni-Zn ferrite protective plate (6) in A),
Prior to cutting a fitting groove (22) for connecting a flexible printed circuit board (not shown) that is electrically and mechanically connected to the thin film magnetic head (A), a conductive material such as Mn-Zn ferrite is prepared. The shield plate (20) is glass-bonded by interposing a spacer (19) made of crystallized glass. The shield plate (20) is glass bonded to the protective plate (6), and the printed circuit board connection fitting groove (2) is attached to the protective plate (6).
2), the substrate (1) on which the magnetic cores (2) (2), . After that, a thin film magnetic head for reproduction (
The shield plate (20) is brought into close contact with the protective plate (13) of B), and in this state, both thin film magnetic heads (A) and (B) are butted against each other and placed in the case (15). After performing alignment such as track alignment and tape touch adjustment of both heads (A) and (B), they are fixed and integrated to form a thin film magnetic head assembly (21).

The present invention has been described above based on an example in which a shield plate (20) is glass-bonded to a protective plate (6) of a thin-film magnetic head (A) for recording, but the scope of rights of the present invention is limited thereby. This is not intended to be construed as such and may include numerous variations.
glass bonding method, thin film magnetic head for recording (A
) or a method of glass bonding the shield plate (20) to the substrate (1) or (8) of the thin film magnetic head (B) for reproduction is also possible.

Note that the shield plate may be bonded using a resin adhesive other than glass, for example, if necessary.

〔Effect of the invention〕

Since the shield plate is integrally glass-bonded to one of the thin-film magnetic heads, when positioning the thin-film magnetic head for insertion into the case, the thin-film magnetic head can be directly aligned without intervening a separate shield plate. As can be understood from the above description, the present invention improves the positioning accuracy of a thin film magnetic head and improves the positioning accuracy of a thin film magnetic head. The present invention can greatly exceed the level of the prior art in terms of facilitating the assembly work of the structure.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a thin film magnetic head according to the present invention, and FIG. 2 is a perspective view of a thin film magnetic head assembly housed in a case. FIG. 3 is a perspective view showing a specific example of a thin film magnetic head for recording, FIG. 4 is a partially enlarged plan view of FIG. 3, FIG. 5 is a side sectional view of FIG. 4, and FIG. FIG. 7 is a partially enlarged plan view of FIG. 6, and FIG. 8 is a schematic cross-sectional view of a conventional thin-film magnetic head structure. (A) Thin-film magnetic head for recording, (B) ---
Thin-film magnetic head for reproduction, (6) (13)--Protective plate, (1) (8)-One substrate, (19)--Spacer, (20
).--shield plate, (21)...-thin film magnetic head structure. Patent Applicant: Kansai NEC Corporation 1゛Representative Person: Gangwon Province 1 No. 2 Figure 4 Leap Figure 5

Claims (1)

[Claims] (1) In a thin film magnetic head assembly for recording and reproducing by integrating a thin film magnetic head for recording and reproducing, a magnetic head element is placed on the substrate or a protective plate of either one of the thin film magnetic heads. 1. A thin film magnetic head structure characterized in that a shield plate made of a conductive material is bonded prior to formation or molding of a protection plate.