JPS6113411A - Composite magnetic head device - Google Patents

Abstract

PURPOSE:To simplify the structure, to facilitate the assembly, and to improve the reliability by storing the 1st magnetic head unit which has a recording magnetic head element part and a recording integrated circuit and the 2nd magnetic head unit for reproduction in respective cases, and jointing them mutually in one surface. CONSTITUTION:The 1st and the 2nd magnetic head units 2R and 2P have cases 3R and 3P, and plate bodies 3R1 and 3P1 and lid bodies 3R2 and 3P2 are made of a soft magnetic body with high magnetic permeability such as ''Permallyo'', i.e. plate material having magnetic shield effect. The lid bodies 3R2 and 3P2 are U-sectioned and respective end surfaces are adhered to internal surfaces of the plate bodies 3R1 and 3P1. The plate bodies 3R1 and 3P1 of those cases 3R and 3P have a recording magnetic head element part 4R and a playback magnetic head element part 4P adhered to their front ends and also have circuit substrates 7R and 7P with circuit parts at the rear parts.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording head, in which case the recording magnetic head also includes an erasing magnetic head for erasing records previously recorded on a magnetic recording medium; A composite magnetic head device in which a reproducing magnetic head is arranged in a relative movement direction with a magnetic medium and integrated into a composite magnetic head, such as a thin film type electromagnetic induction recording magnetic head and the magnetoresistive effect of the amount of S film. The present invention relates to a composite magnetic head device in combination with a (hereinafter abbreviated as MR) type reproduction magnetic head.

BACKGROUND TECHNOLOGY AND PROBLEMS A composite magnetic head device in which a recording magnetic head and a reproducing magnetic head are integrated is such that each magnetic gap between the recording magnetic head and the reproducing magnetic head is in the direction of movement of the recording medium. They are integrated so that they are arranged along the same line.

In this case, each recording magnetic head and reproducing magnetic head does not have a structure in which only each magnetic head element section having a magnetic head element provided for a single or plural channels is combined. A structure in which first and second magnetic head units are joined and combined, each of which incorporates an integrated circuit related to a magnetic head element, a capacitor array for signal extraction, a capacitor for stabilizing power supply, and other circuit sections. Attempts are being made.

However, in such a composite magnetic head device, as described above, when integrated circuits related to the magnetic head element portion or circuit components such as capacitors and capacitor plays are integrated into each unit, it is necessary to
When handling the joint assembly of the throat, care must be taken to avoid breakage, disconnection, etc. of the parts mounted on these, which is troublesome, and the installation of each head unit and throat depends on the structure of the parts and the azimuth and elevation angle of each. etc. position adjustment becomes complicated.

OBJECTS OF THE INVENTION The present invention aims at simplifying the structure, facilitating assembly, and improving reliability in the above-mentioned composite magnetic gutter device.

Summary of the Invention In the present invention, a first magnetic head unit has at least a magnetic gutter element section for recording and an integrated circuit for recording, and a first magnetic head unit has at least a magnetic gutter element section for reproduction and an integrated circuit for reproduction. The first and second magnetic head units are housed in respective cases and joined to each other at each side of each case.

At least the joint surfaces of each case are made of a high permeability magnetic material.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a composite magnetic head device according to the present invention will be described with reference to the drawings. In this example, a composite magnetic head device is constructed by combining a thin-film electromagnetic induction recording magnetic head and a thin-film MR reproducing magnetic head. FIG. 2 is an enlarged sectional view taken in the - plane, FIG. 3 is an enlarged sectional view taken in a direction orthogonal to FIG. 2, and FIG. This is an enlarged exploded perspective view of the case, FIGS. 5 and 6 are enlarged sectional views and an enlarged plan view of the recording magnetic head, and FIGS. 7 and 8 are enlarged sectional views of the reproducing magnetic head. and an enlarged plan view. In the figure (1)
1 shows a composite magnetic head device according to the present invention as a whole. This composite magnetic head device (1) is made up of first and second magnetic head units (2P) and (2P) joined together.

These first and second magnetic heads (2R) and (2P) have cases (3R) and (3P), respectively. These cases (3P) and (3P), as shown in FIG. 5, each consist of a cover body (3R1) and (3Pt) and a cover body (3R2) and (3P2). These plates (
3Rs) and (3Ps), and the lid (3R2) and (3Ps).
It is desirable that P2) be made of a high permeability soft magnetic material such as permalloy, and at least the plates (3Rz) and (3Rz)
P1) is constituted by this high magnetic permeability soft magnetic material, that is, a netsuke having a magnetic shielding effect.

Further, the plates (3R1) and (3Pl) are constituted by plate-like bodies having excellent flatness and uniformity of thickness.

The lid bodies (3R2) and (3P2) each have a tri-shaped cross section, and are arranged on main plate parts (3R2a) and (3P2a) facing the plate bodies (3R1) and (3Pt), and on both side edges thereof. Side plate part (3R2b) (3R2C) and (3
P2b) (3P2C), and each side plate part (3R
2b ) (3R2C) and (3P2b ) (3P2
Each end face of C) is adhered to each inner surface of the plate (31h) and (3P work). A recording magnetic head element section (4R) and a reproducing magnetic head element section (4P) are bonded to the front ends of the plates (3R1) and (3P1) of these cases (3R) and (3P) in advance. , behind these heads (4
Integrated circuits (5R) and (5P) related to or accompanying R) and (4P), for example, a power supply stabilizing capacitor (
6R), capacitor array for signal current extraction (
The circuit boards (7R) and (7P) made of ceramic or the like, on which the circuit parts are formed by mounting the magnetic head element parts (4R) and (4P), respectively, are glued together. On the plates (31h) and (3P1) to which the substrates (7R) and (7P) are attached, cover the attachment parts of the magnetic head element (4R) and the substrates (7R) and (7P) as described above. Lid body (3R2) and (3P2)
Glue.

In the illustrated example, the front ends of both cases (3R) and (3P) are narrow, and the plates (3R1) and (3P) are narrow.
Pz) and the main plate parts (3R2a) and (3P2a) are provided with a narrow part with a small interval, and the magnetic head element parts (4R) and (4P) are housed in this narrow part.

The first and second units (2R) and (2P) housed in the cases (3R) and (3P) in this way are connected to the - sides of the respective cases (3R) and (3P). The outer surfaces of the plates (3Rz) and (3Pt) are joined together by, for example, irradiating the side end surfaces with a laser beam and performing spot welding SP as shown in FIG. Then, the first and second magnetic hend unisols which are joined together are
- (2R) and (2P) are inserted into a common cylindrical outer casing (8) with a square cross section, for example.

In this case, the surfaces of the magnetic field elements (4R) and (4P) facing the magnetic medium are made to face the outside from the front of the cases (3R) and (3P) and the outer casing (8).

Next, each of the above-mentioned magnetic hesode units I-(2R) and (2R)
An example of each magnetic head element portion (4P) and (4R) of P) will be explained. First, the recording magnetic head element section (4R) will be explained. This recording magnetic head element section (4R) is made of, for example, Mn--Zn ferrite, Mn--Ni ferrite, as shown in an enlarged plan view in FIG. 5, and as shown in FIG. A magnetic substrate (11
), electromagnetic induction type thin film magnetic head elements hr are arranged in parallel corresponding to a large number of channels. In this case, the substrate (11) has a base &(1) facing its main surface (lla).
1) A groove (12) is formed along the longitudinal direction and filled with a non-magnetic material (13), for example glass. Further, on the surface (lla) of the substrate (11), if the substrate (11) is conductive, a non-magnetic insulating layer (14) such as 5i (h) is deposited on this. conductor means (15)
is deposited and arranged. This conductor means (15) includes, for example, a strip-shaped thin film conductor (16) that serves as a common bias wire for all channels (tracks), and a strip-shaped thin film conductor that serves as a signal wire provided corresponding to each channel. (17). At least a portion of these conductors (16) and (17) are provided along the groove (13). Strip-shaped thin-film magnetic cores (18) made of a thin-film magnetic layer such as permalloy are deposited in parallel across the groove (13) and the conductor means (15) thereon, corresponding to each channel. In this case, an insulating layer (19) such as 5i02 is deposited on the conductor means (15) to electrically insulate it from the thin film magnetic core (18). One end of each thin-film magnetic core (18) may include, for example, an insulating layer (14) and/or (19
) to form a working magnetic gap GR between the insulating substrate (11) via a non-magnetic gap spacer (20), the other end of which is bored in the insulating layers (19) and (14), for example. Through the window (21), it is magnetically closely coupled to the surface (11a) of the substrate (11). In this way, the common substrate (
11) and each thin-film magnetic core (18), a closed magnetic path is formed, respectively, and the magnetic head element hr of each channel is configured.

Then, on each magnetic head element hr, a protective substrate (22) with excellent wear resistance is placed opposite the substrate (11) using an adhesive (
23). Then, these substrates (11
) and (22), the surface (60R) facing the magnetic medium facing the magnetic gap GR is formed by polishing.

This recording magnetic head section (4R) is connected to its substrate (
On the 11) side, it is glued to the plate (3R work) of the case (3R).

Further, in the head element portion (4R), the conductor means (15)
Terminal conductive layers (16a), (16b) and (17a), (17b) extend from each end of the thin film conductors (16) and (17), respectively, to the rear edge of the substrate (11). . In this case, the width of the protective board (22) is smaller than the width of the magnetic board (11), and the width of each terminal (16) is set smaller than the width of the magnetic board (11).
a).

(16b), (17a) and (17b) are exposed outside the protective substrate (22). So “ζ
Each terminal (16a) extending on this board (11),
(16b) and (17a), (17b)
are respectively connected to predetermined circuit parts formed on the ceramic base using lead wires.

The magnetic head element section for reproduction (4P) is shown in FIG. 7 as an enlarged sectional view, and as shown in FIG.
Reproducing magnetic head elements hp corresponding to each channel are arranged on a common substrate (41) corresponding to each head element hr.

The substrate (41) is made of, for example, Ni-Zn ferrite or M
If this substrate (41) is made of n-Zn ferrite or the like and has conductivity, an MRI
Im! For example, a Ni--Fe alloy or a Ni-- MRIIII with magnetoresistive effect such as Co-based alloy! Motoko (45
) is arranged. And a thin insulation on this MR8 film element (45)! (46), one end of which extends across the bias conductor (43) and the MR11 film element (45), each of which is made of, for example, a Mo permalloy magnetic layer;
A thin film magnetic core (47) and (
48) is deposited. Adhesive (49) is placed on the substrate (41).
) is bonded to the protective substrate (50). A non-magnetic gap spacer layer (51) made of, for example, an insulating layer (46) having a required thickness is interposed between the front end of one magnetic layer (47) and the substrate (41). A magnetic gap GP is formed. And this magnetic gear knob GP
A surface (60P) facing the magnetic medium is formed by polishing across the substrates (41) and (50) so that the surface faces the magnetic medium.

Also, the thin film magnetic core (47) that constitutes the magnetic gap GP
The rear end of the thin film magnetic core (48) and the front end of the other thin film magnetic core (48) are respectively formed so as to straddle the MR\# film element (45) with an insulating layer (46) in between. A discontinuous portion (53) is formed which is spaced apart by. The rear and front ends of both thin film magnetic cores (47) and (48) are MR
Insulating layers (46) are interposed on both sides of the element (45) so that the element (45) is electrically insulated but magnetically coupled. In this way, the discontinuous portions (43) of both thin film magnetic cores (47) and (48) are magnetically connected by the MR element (45), and the substrate (41) - magnetic core GP - thin film magnetic An MR type head element is formed in which a magnetic circuit is formed by a core (47), an MR element (45), a thin film magnetic core (48), and a substrate (41), respectively. This reproducing magnetic head element section (4P) is connected to its substrate (4P).
) is bonded to the plate (3Pz) of the case (3P).

In Fig. 8, (43a) (43b)
(45a) and (45b) represent each MR''a film element (45) at each end of the bias conductor (43) and each head element.
A terminal conductive layer extends from each end of the board (41) to the end not covered by the protective board (50), and these are connected to a predetermined part of the circuit section on the ceramic board (7P) described above, for example, with a lead. Connected by wire.

As described above, according to the magnetic head device according to the present invention,
In each child, the magnetic head element (4R) and (4P), which are associated with or associated with the case (3R) and (3P), are housed, and the magnetic head unisan for recording and playback) and (2R) (2R). 2P), but
Furthermore, these units (2R) and (2P) are housed in the outer casing (8) in a state where they are joined to each other, and cases (3R) and (3P) are housed in the outer casing (8). Although not shown in the figure, a resin mold is applied to press the circuit part, including a resin mold, to cover each component and its interconnecting wires, etc. to provide mechanical protection, moisture resistance, environmental protection, etc.

In addition, each case (3R) of each unit) (2R) and (2P)
) and (3P), for example, as shown in FIG. Protruding walls (61) are provided on both sides along the direction of relative movement with the magnetic medium at positions that do not impede this movement and protrude from both radiation contact surfaces (60R) and (60P), and the magnetic head If another object is to impact the contact surfaces (60R) and (60P) of the element portions (4R) and (4P) with the respective magnetic media, this projecting wall (61) will first be impacted by the other object. While handling the magnetic head, remove the magnetic hesode element (
4R) and (4P), especially in the vicinity of the magnetic gears GR and CP, to prevent damage.

In the above example, a composite magnetic head device is constructed by combining a thin-film electromagnetic induction magnetic head and an MR magnetic head, but other types of recording magnetic heads and reproducing magnetic heads may be used. The present invention can be applied to a combination of magnetic heads for use in magnetic heads.

Effects of the Invention As described above, according to the present invention, the magnetic hand units (2R) and (2P) housed in the cases (3R) and (3P) are joined together, so that each unit (2R) and (2P) is now safe to handle, and the fuselage (3R) is the negative part of each case (3R) and (3P).
Remagnetic head element parts (4R) and (4Ps) for recording and reproduction are formed by butt joining R1) and (3Ps).
Both head element parts (4R)
, (4P) can be sufficiently narrowed, and the positioning of both can be performed accurately. Therefore, setting and adjustment of the position of this composite magnetic head can be performed accurately and easily.

[Brief explanation of the drawing]

FIG. 1 is an enlarged perspective view with a part cut away of an example of a junction type magnetic head device according to the present invention, FIG. 2 is an enlarged cross-sectional view thereof, FIG. 3 is an enlarged cross-sectional view in another plane, and FIG. 5 and 6 are enlarged exploded perspective views of one magnetic hend unit.
The figure is an enlarged sectional view and an enlarged linear plan view of the recording magnetic head element section, and FIGS. 7 and 8 are an enlarged sectional view and an enlarged linear plan view of the reproducing magnetic head element section. (1) is a composite magnetic head device, (2R) and (2P)
are the first and second magnetic hends, (3R) and (
3P) is the case, (8) is the common outer casing, (4R) and (4P) are the recording and reproducing magnetic head element parts, (5R)
) and (5P) are recording and reproducing built-in circuits. Same as Hidemori Matsukuma 1, 1. ''', -・1111.Kuraichi° Yamasha Figure 1 Figure 2 l

Claims (1)

[Claims] a first magnetic head unit having at least a recording magnetic head element section and a recording integrated circuit; a second magnetic head unit having at least a reproducing magnetic head element section and a reproducing integrated circuit; The first and second magnetic head units are each housed in a case, and are joined to each other on one surface of each case, and at least the joint surfaces of the cases are made of a high magnetic permeability magnetic material. Composite magnetic head device.