JPS58122612A - Multi-element magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture a multi-element magnetic head with narrow track interval easily, by laminating plural layers of nonmagnetic substance film and magnetic substance film sequentially on the entire outer surface of a core member. CONSTITUTION:The nonmagnetic substance film 2 made of SiO2 is formed on the surface of a core member 1 made of a magnetic substance such as ferrite with the sputtering. A shield film (magnetic substance film) 3 made of a magnetic substance such as ''Permalloy '' is formed on the surface of the nonmagnetic substance film 2 with vapor-deposition to form a one-side core single body 4. No shield film 3 is formed at the winding part. A spacer 5 is inserted between the single bodies 4, they are bonded to form a one-side core assembly 6. The gap butt plane is polished to form the nonmagnetic substance film like SiO2, the one-side core assemblies are opposed and fixed, the tape sliding plane is polished to complete a multi-element magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-element magnetic head and a method for manufacturing the same, in which a plurality of cores each having a non-magnetic film and a magnetic film sequentially adhered to the entire outer surface of the core material are stacked to form a magnetic head between trunks. The multi-element magnetic head with narrow spacing and the core numbering are covered with a non-magnetic material film and a magnetic material film using thin film technology, making it easy to lead to a multi-element magnetic head with narrow spacing between tracks (this makes it possible to easily drive a multi-element magnetic head with narrow spacing between tracks). /11 degrees.

In recent years, multi-element self-recording/playback heads have been developed for use in POM recorders, etc., but these generally have limited track width and inter-track spacing (between one track and an adjacent track). The gap) is configured to be narrow. In addition to such multi-element magnetic heads, there are so-called thin-film head types using thin-film technology and types with laminated cores such as ferrite and sendust.
, N 5 It is difficult to record and reproduce in a short wavelength band, and the latter G has a large opposing area with an adjacent core, resulting in a cross-flash problem.

Methods for reducing crosstalk in such a multi-element magnetic head of the core lamination type include 4T, ■reducing the facing area with adjacent cores, ■widening the spacing between tracks, and ■inserting a shield plate. method is known. Among these methods, in method (■), it is impossible to reduce the size with the current structure as it is until it reaches the road limit, and if the core dimensions are reduced further, the core winding space will become smaller, so it is necessary to make the wire thinner or reduce the number of turns. As a result, the signal-to-noise ratio deteriorates.With method (2), the spacing between tracks is determined from the tape width and the number of tracks, and the tape width and number of tracks are based on the specifications of all FI-sound machines. Since it is determined by
If the number of tracks is -, increasing the spacing between tracks will inevitably result in narrowing the track width, resulting in a decrease in /i8 degrees and a worsening of the 8N ratio. J1r
There are drawbacks such as difficulty in using a multi-element magnetic head with an extremely narrow l+5 spacing.

As described above, all crosstalk reduction measures for core laminated type multi-element magnetic heads have drawbacks, but the present invention eliminates these drawbacks by considering the crosstalk reduction measures by providing a shield plate. An embodiment of the present invention will be described below with reference to the drawings.

During manufacturing, as shown in FIG. 1, an 8i
The non-magnetic film 2, such as 0 It also serves as insulation between the core and the winding.

Next, a shield film (magnetic film) 3 made of a magnetic material such as permalloy is formed on the surface of the non-magnetic film 2 by vapor deposition or the like to form a single-sided core 4. At this time, if the shield film 3 is also formed on the winding part (not shown), the magnetic flux will pass there too and it will work not as a shield member but as part of the core material, so this winding part should be masked etc. shield sniff 3
Strain to avoid forming any lumps. Crosstalk mainly occurs near the front gap where the magnetic flux density is high, so it is sufficient to apply a shielding film only to the surface facing the adjacent core, including the vicinity of the front gap. The shielding effect is more complete if the shielding film 3 is applied to the surface.

Prepare the necessary number of such single-sided core units 4, and as shown in Figure 2, insert spacers 5 (preferably non-magnetic and electrically insulating material) between the units 4 and adhere them to each other. A one-sided core assembly 6 is made.

Next, when the gap abutting surface is polished to the part indicated by the broken line in FIG. 2, the cross sections of the core material 1, nonmagnetic film 2, and shield film 3 are exposed on that surface. Next, Si is deposited on this polished surface by sputtering or the like to a thickness of, for example, 1 micron or less.
A non-magnetic film (not shown) such as O□ is formed (this will become a gap spacer).

Although it is not necessary to form a nonmagnetic film that determines the gap width on these cores, it may be formed for convenience in the assembly process. At this time, the non-magnetic film on one side of the core is made thinner by that amount. ) and their gap abutting surfaces are fixed facing each other, and when the tape sliding surface is finally polished, the cross sections of the core material 11, non-magnetic film 2, shield film 3, and gap spacer 7 are exposed on this tape sliding surface. I decided to do it,
A multi-element magnetic head shown in FIG. 3 is constructed.

In this way, in this example, the shield film was formed by vapor deposition, etc., so a multi-element magnetic head with a narrow track spacing could be manufactured using the conventional method of inserting a spacer, shield plate, or spacer between adjacent cores. It is easier to manufacture than the core material 1, and since the single unit 4 with the non-magnetic film 2 and the shield pM3 formed on the core material 1 is prepared, the assembly work is similar to the manufacturing process of a magnetic head without a shield plate. It's almost the same.

FIG. 4 shows a front view of another embodiment of the magnetic head of the present invention. This device, along with still another embodiment shown in FIG. 5, has a structure in which a non-magnetic film and a shielding film are applied only to a single core on one side of the force, and no winding is wound around the single core. .

In the case shown in FIG. 4, first, as shown in FIG. 2, a one-sided core assembly 6 whose gap abutting surface is polished and a non-magnetic film serving as a gap spacer is deposited thereon is prepared. A one-sided core assembly 8 is prepared in which the core material 1 and spacers 5' are alternately laminated and bonded without applying anything to the surface of the material 1, and the gap abutting surfaces thereof are polished. The core assembly 8 differs from the core assembly 6 in that nothing is applied to the surface of the core material 1, so the core material 1 of the core assembly 8 and the core material 1 of the core assembly 6 are made to face each other. Of course, the spacer 5' of the aggregate 8 is formed thicker than the spacer 5 of the core 6 by that much.

Next, the core assembly 8 and the core assembly 6 are fixed with their gap abutting surfaces facing each other, and then the tape sliding surface is polished.

FIG. 5 shows a front view of still another embodiment of the magnetic head of the present invention. This product is made by laminating and bonding alternately the single-sided core 4 produced by the method explained in FIG. One-side core assembly 9. The abutting surfaces are polished and a non-magnetic film serving as a gap spacer is deposited thereon.
and core assembly 9. Core material 1 and spacer 5 in the same way as
``, one-sided core assembly 92 in which core single bodies 4 were laminated and bonded to form a gap abutment surface opposite to that of the core assembly 91 was fixed with the gap abutment surfaces facing each other, and the tape sliding surface was polished. It is something.

As described above, the multi-element magnetic head of the present invention includes a non-magnetic film coated on the entire outer surface of a flat core material, and a magnetic film coated on the entire outer surface of the core material coated with the non-magnetic film. Since a plurality of cores coated with ferrite are laminated via spacers, it is easier to construct a multi-element magnetic head with a narrower track spacing compared to a multi-element magnetic head in which a ferrite plate or @ plate is inserted into the spacer. In addition, a non-magnetic film is deposited by thin film technology on at least a portion of the surface of the core material made of a magnetic material, including the area around the front gap of the surface facing the core of the adjacent trough, and then , at least the part including the periphery of the front gap of the surface facing the core of the adjacent track'
Since a magnetic film is deposited on the surface of the non-magnetic film using thin film technology, it is easier to mount a magnetic head with narrower track spacing than with the conventional method of inserting a ferrite plate, copper plate, etc. between spacers. Furthermore, since thin film technology is used, the film thickness can be freely selected, and the surface can be manufactured with high precision.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of one side core for explaining the manufacturing process of the method of the present invention, and Figure 3 is a front view of one example of a multi-element magnetic head manufactured by the method of the present invention. , 4th
5 and 5 are front views of another embodiment and still another embodiment of a multi-element magnetic head according to the method of the present invention, respectively. 1. Core material, 2.--Nonmagnetic film, 3. Shielding film (@column m), 4@.One side core alone, 5.0 spacer, 6.One side core assembly, 7■・Gap spacer.

Claims (2)

[Claims] (1) In a multi-element magnetic head with narrow track spacing, a non-magnetic film is coated on the entire outer surface of a flat core material, and a magnetic film is also coated on the entire outer surface of the core material coated with the non-magnetic film. A multi-element magnetic head characterized by having a plurality of deposited cores stacked together with spacers interposed therebetween. (2) forming a non-magnetic film by thin film technology on at least a portion of the surface of the core material made of a magnetic material, including the area around the front gap of the surface facing the core of an adjacent track;
Next, a multi-element magnetic head is characterized in that a magnetic film is deposited by thin film technology on the surface of the non-magnetic film at least in a portion including the periphery of the front gap of the surface facing the core number of adjacent tracks. manufacturing method.