JPH03105709A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To assure high-accuracy head characteristics with simple constitution by successively laminating metallic magnetic material film layers and nonmagnetic material layers, then removing the laminating metallic magnetic material film layers and nonmagnetic material layers on both sides of a track width. CONSTITUTION:The track width TW is formed on magnetic material cores 10a, 10b and the metallic magnetic material film layers 11a, 11b and the nonmagnetic material layers 12a, 12b are successively formed thereon. The metallic magnetic material film layers 11a, 11b and nonmagnetic material layers 12a, 12b on both sides of the track width TW are thereafter removed to form the track width TW coated the metallic magnetic material film layers 11a, 11b and the nonmagnetic material layers 12a, 12b up to both ends of the track width TW. The adhesive areas of the magnetic material cores 10a, 10b and an adhesive 13 can, therefore, be taken large without adversely affecting the operation to form the track width TW. Thus, the constitution is simplified and the high-accuracy head characteristics are assured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method of manufacturing a magnetic head used, for example, in a video tape recorder or a floppy disk device.

(Prior art) Recently, in this type of magnetic head, in order to cope with the increase in coercive force and high residual magnetic flux density accompanying the increase in the density of recording media, it has been developed to MIG (Met
A head with a high saturation magnetic flux density and a small residual magnetic flux density, called an AlInGap) head, has appeared.

Figure 6 shows such a conventional magnetic head, in which the core body is formed of a pair of magnetic cores la and lb, such as ferrite, and a non-magnetic material such as 810■ is inserted between the magnetic cores la and 1b. A gap G formed between the body film layers 2a and 2b is sandwiched between the metal magnetic film layers 3a and 3b. That is, as shown in FIG. 7, the track width Tw is formed on the magnetic cores la and lb at a predetermined pitch interval P (see FIG.
a). In (b), only one is shown). On the surface corresponding to this track width Tw, metal magnetic film layers 2a and 2b of, for example, about 4 to 8 μm are formed by sputtering or the like, and on these metal magnetic film layers 2a and 2b, 0.2 to 0.0 μm are formed. Nonmagnetic film layers 3a and 3b having a thickness of about 5 μm are similarly formed by sputtering or the like. Then, magnetic cores la, Ib are formed with metal magnetic film layers 2a, 2b and non-magnetic film layers 3a, 3b.
are bonded using an adhesive 4 with their surfaces corresponding to the track width TW facing each other, and then cut as shown by the broken line in FIG. 7(c) to form the magnetic head shown in FIG. Ru.

However, in the above magnetic head, the pair of magnetic cores la
, lb, and the metal magnetic film layer 2a between the adhesive material 4 that joins the
, 2b are interposed, the magnetic cores la, lb
The adhesive strength of the adhesive 4 that joins the metal magnetic film layers 2a,
2b, its magnetic core 1 a
There was a problem in that peeling was likely to occur at the interface between +1b and the metal magnetic film layers 2a and 2b. When peeling occurs at the interface between the magnetic cores la, lb and the metal magnetic film layers 2a, 2b, the sliding portion of the recording medium corresponding to the track width Tw is affected by the peeling, and the magnetic cores la, lb are affected by the peeling. 1
A problem occurs in that a so-called pseudo gap occurs between the metal magnetic film layers 2a and 2b. According to this, as shown in FIG. 8, the frequency characteristic A due to the gap G is normally
However, as the outputs B and C are generated due to the pseudo gap, the head characteristics are deteriorated and it becomes difficult to obtain the desired head characteristics.

(Problems to be Solved by the Invention) As described above, conventional magnetic heads have had the problem that pseudo caps occur, making it difficult to obtain desired head characteristics.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for manufacturing a magnetic head that has a simple structure and can ensure highly accurate head characteristics.

[Structure of the Invention] (Means and Effects for Solving the Problems) This invention provides a metal magnetic film layer and a non-magnetic film layer on at least one of a pair of magnetic cores in which track widths are formed at predetermined intervals. a first step of sequentially forming layers; and forming metal magnetic films on both sides of the track width so that the metal magnetic film layer and the non-magnetic film layer cover up to both ends of the track width of the one magnetic core. A second step of forming a groove from which the magnetic layer and the non-magnetic film layer are removed, and bonding one magnetic core with the groove formed thereon and the other magnetic core using an adhesive with their track widths facing each other. A magnetic head is manufactured by forming a gap having a metal magnetic film layer on at least one surface thereof, and then cutting to form a head chip.

According to the above configuration, the magnetic head forms the track width Tw on the magnetic core, sequentially forms the metal magnetic film layer and the non-magnetic film layer, and then forms the metal magnetic film layer and the non-magnetic film layer on both sides of the track width. By removing the nonmagnetic film layer, a track width Tw is formed in which both ends of the track width Tw are covered with the metal magnetic film layer and the nonmagnetic film layer. Therefore, in addition to ensuring highly accurate formation of the track width Tw, a sufficient bonding area between the magnetic core and the adhesive is ensured.
A robust metal magnetic film layer can be produced.

Further, in the present invention, after forming a plurality of pairs of grooves regulating the track width in at least one of the pair of magnetic cores,
While sequentially forming a metal magnetic film layer and a non-magnetic film layer,
a first step of forming a track width on the other magnetic core in a manner corresponding to the track width of the one magnetic core; and a first step of forming a track width on the other magnetic core in accordance with a track width of the one magnetic core; forming a track width covered with the metal magnetic film layer and the non-magnetic film layer, and forming a track width on the other magnetic core corresponding to the track width of the one magnetic core. In the second step, one of the magnetic cores from which the gaps between the plurality of grooves have been removed in the second step is joined to the other magnetic core using an adhesive with the track widths facing each other. A magnetic head is manufactured by forming a gap sandwiched between the metal magnetic film layers, and then cutting the magnetic head to form a head chip.

According to the above configuration, the magnetic head has a plurality of pairs of grooves that regulate the track width Tw of the magnetic core, and a metal magnetic film layer and a nonmagnetic film layer are formed on the surface on which the pair of grooves are formed. By sequentially forming the grooves and then removing the space between the pair of grooves,
A track width Tw whose both ends are covered with a metal magnetic film layer and a nonmagnetic film layer is formed. Therefore, the track width Tw
In addition to ensuring a highly accurate forming operation, a sufficient adhesion surface between the magnetic core and the adhesive is ensured, and a robust metal magnetic film layer can be manufactured.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a magnetic head to which an embodiment of the present invention is applied. In the figure, reference numerals 10a and 10b represent a pair of magnetic cores, and track widths Tw are formed approximately in the center of the cores to correspond to each other. . These magnetic cores 10a and 10b are covered with a metal magnetic film layer 11 of about 4 to 8 μm made of sendust or the like so as to cover up to the end of the track width Tw. Non-magnetic film layers 12a, 12b such as S, O, etc. having a size corresponding to the gap G (approximately 0.24 to 0.5 μm) are laminated in order, and the mutual non-magnetic Body membrane layer 12a,
12b are butted and joined using an adhesive 13 such as glass to form a gap G sandwiched between the metal magnetic film layers 11a and llb.

With the above configuration, the pair of magnetic cores 10a and 10b are
The metal magnetic film layers 11a, llb and the non-magnetic film layer 1
Portions other than 2a and 12b are directly bonded via adhesive 13 to ensure a sufficient bonding area. As a result, a pair of magnetic cores 10a, 10b and a metal magnetic film layer 11a
. The adhesive force of the adhesive 13 that joins the parts other than 2b acts to join them.

Next, a metal magnetic film layer 11a, so as to cover both ends of the track width Tw of the pair of magnetic cores 10a, 10b,
A method of manufacturing a magnetic head in which the magnetic head llb and the nonmagnetic film layers 12a and 12b are formed will be described.

That is, in the first step shown in FIGS. 2(a), (b), and (c), a pair of magnetic cores 10 such as ferrite
g. After forming the winding groove 14 on one side of the winding groove 10b, a track width Tw is formed on each with a pitch interval P, and then a layer of Kinma magnetic material 11a, 11b made of Sendust or the like is formed by approximately 4 to 8 lbs.
Non-magnetic film layers 12a and 12b of .mu.m 1 Sho. Then, in the second step, as shown in FIG. 2(d), the magnetic cores 10a, 10
The metal magnetic film layer 11a extends to both ends of the track width Tw of b.
, llb and the non-magnetic film layers 12a, 12b are formed by removing both sides of the track width Tw (in the figure, only one is shown as they are formed in substantially the same way).
.

Next, in a third step, as shown in FIG. 2(e), similarly formed magnetic cores 10a and 10b are butted together so that their track widths Tw correspond to each other, and bonded using an adhesive 13. Then, the magnetic head is formed by cutting as shown by the broken line in the figure.

The magnetic head has metal magnetic film layers 11a, 11b and non-magnetic film layers 12a, 12b connected to magnetic cores 10a, 10.
By being provided so as to cover only up to both ends of the track width Tw of b, in the bonded state of the magnetic cores 10a and 10b, other than the metal magnetic film layers 11a and llb that cover up to both ends of the track width Tw The parts are directly joined via the adhesive 13, and a sufficient bonding area by the adhesive 13 is ensured. As a result, magnetic cores 10a, 1
The adhesive strength between 0b and the metal magnetic film layers 11a and 11b is increased by the adhesive force of the adhesive 13 that joins the magnetic cores 10g and 10b, and the strong adhesion is realized, so that Magnetic core 1 that causes pseudo-gips
It is possible to prevent separation between the metal magnetic film layers 11a and llb and the metal magnetic film layers 11a and 11b, and to ensure head characteristics as highly accurate as possible.

In this way, in the above method for manufacturing a magnetic head, the track width Tw is formed in the magnetic cores 10a and 10b,
Metal magnetic film layers 11a, llb and non-magnetic film layer 12a
, 12b are sequentially formed, and then metal magnetic film layers 11a . llb and non-magnetic film layer 12
a, 12b are removed, and the metal magnetic film layers 11a, llb and the non-magnetic film layers 12a. 1
A track width TW covered by 2b is formed.

According to this, the magnetic cores 10a, 10b and the adhesive 13 can be connected to each other without adversely affecting the work of forming the track width Tw.
Since the adhesive area of the metal magnetic film layers 11a and llb can be increased, it is possible to secure simple manufacturing work and to
peeling can be prevented.

In addition, in the above embodiment, the metal magnetic film layers 11a, which cover both ends of the track width Tw of the magnetic cores 10a, 10b,
llb and the non-magnetic film layers 12a, 12b are formed by providing grooves 15 for removing the metal magnetic film layers 11a, llb and the non-magnetic film layers 12a, 12b on both sides of the track width Tw. However, the manufacturing method is not limited to this, and a configuration as shown in FIG. 3, for example, is also possible.

That is, in the first step, the steps shown in FIGS. 3(a), (b). (
As shown in C), for example, the track width Tw is about 20 μm.
, a pair of magnetic cores 10a, such as ferrite, with a winding groove 14 formed on one side. Track width to 40b”
A pair of grooves 16a that regulate rw. 1.6b to 300μm
A plurality of pieces are formed at a certain interval P. Then, this magnetic core 10a. 10b has its groove 16a. 16b, a metal magnetic film layer 11a, 1lb made of Sendust or the like is deposited with a thickness of about 4 to 8 μm, and a non-magnetic film layer 12a, made of SSIO2 or the like is coated. 12b
are sequentially formed by sputtering or the like to an extent corresponding to the gap G (approximately 0.24 to 0.5 μm). This pair of grooves 16a
, 16b is at least twice the layer thickness of the metal magnetic film layers 11a, llb and the non-magnetic film layers 12a, 12b, and at most 10 times the layer thickness. The metal magnetic film layers 11a, 1lb and the non-magnetic film layers 12a, 12b formed by laser, etching, etc. and deposited on the magnetic cores 10a, 10b allow penetration to the vicinity of the opening.

In the second step, as shown in FIG. 3(d), the pair of grooves 16a, 16b of the magnetic cores 10a, 10b and the space between the adjacent pair of grooves 16a, 16b are removed, respectively.
Metal magnetic film layers 11a, llb and non-magnetic layers 12a . A track width Tw covered by 12b is formed. Next, in the third step, as shown in FIG. 3(e), the magnetic core 10a. 10b
After bonding the comrades with the adhesive 13 with their track widths Tw facing each other to form a gap G sandwiched between the metal magnetic film layers 11a and 1lb, they are cut as shown by the broken line in the figure. A magnetic head is formed as shown in Figure (f).

In the above manufacturing method, the magnetic core 10a, ], O
A plurality of pairs of grooves 16a regulate the track width Tw of b.
, 16b are formed, and a metal magnetic film layer 11a . 1lb and non-magnetic layer 1
2a, 12b are formed in order, and then a pair of grooves 16a,
The magnetic material is A magnetic head having a large adhesion area between the cores 10a and 10b and the adhesive 13 can be easily formed without adversely affecting the formation of the track width Tw.

Furthermore, in the above embodiment, a pair of magnetic cores 1, Oa, 1
Metal magnetic film layers 11a and 11.0b are respectively provided. b and the non-magnetic film layers 12a, 12b are provided, and the gap G is sandwiched between the metal magnetic film layers 11a, llb, but the present invention is not limited to this, for example, as shown in FIG.
It is also applicable to a so-called one-sided MIG head in which the metal magnetic film layer 11a is provided only on one side of the gap G. In this case, one of the magnetic cores 10a of the pair of magnetic cores 10a and 10b is coated with a Kinjo magnetic film layer 11a that covers both ends of the track width TW by any of the above manufacturing methods.
and non-magnetic film layer 1. 2a may be formed.

Furthermore, a plurality of gaps Gl as shown in FIG.
, G2 is also applicable.

Therefore, it goes without saying that the present invention is not limited to the embodiments described above, and that various modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a method for manufacturing a magnetic head that has a simple structure and can ensure highly accurate head characteristics.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a magnetic head produced by a method of manufacturing a magnetic head according to an embodiment of the present invention, FIG. 2 is a process diagram for explaining the method of manufacturing the magnetic head of FIG. 1, and FIG. FIGS. 4 and 5 are process diagrams shown to explain a method of manufacturing a magnetic head according to another embodiment of the present invention, and FIGS. 6 to 8 are diagrams showing other embodiments of the present invention. FIG. 1 is a diagram shown to explain problems with a conventional magnetic head. 10a, 10b--magnetic core, lla, Ilb...
- Metal magnetic film layer, 12a, 12b... Non-magnetic film layer, 13... Adhesive, 14... Winding groove, 15... Groove, 16a, 16b... A pair of grooves.

Claims (3)

[Claims] (1) A first step of sequentially forming a metal magnetic film layer and a non-magnetic film layer on at least one of a pair of magnetic cores in which track widths are formed at predetermined intervals; A second step of forming a groove by removing the metal magnetic film layer and the non-magnetic film layer on both sides of the track width so that the metal magnetic film layer and the non-magnetic film layer cover both ends of the track width. and one magnetic core with the groove formed thereon and the other magnetic core with track widths facing each other and joined using an adhesive to form a gap having a metal magnetic film layer on at least one side. and a third step of cutting to form a magnetic head. (2) a first step of forming a plurality of pairs of grooves regulating the track width in at least one of the pair of magnetic cores, and then sequentially forming a metal magnetic film layer and a nonmagnetic film layer; By removing the gaps between the plurality of pairs of grooves in the magnetic core,
Forming a track width whose both ends are covered with the metal magnetic film layer and the non-magnetic film layer, and forming a track width on the other magnetic core corresponding to the track width of the one magnetic core. a second step of joining one of the magnetic cores from which the spaces between the plurality of grooves have been removed in this second step to the other magnetic core with the track widths facing each other using an adhesive; A method for manufacturing a magnetic head, comprising: forming a gap sandwiched between the metal magnetic film layers, and then cutting to form a magnetic head. (3) The plurality of pairs of grooves have a width dimension that is at least twice the layer thickness of the metal magnetic film layer and the non-magnetic film layer, and one of the layer thicknesses.
4. The method of manufacturing a magnetic head according to claim 3, wherein the magnetic head is formed with a magnification of 0 times or less.