JPS6313109A - Composite magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a composite magnetic head capable of carrying out satisfactory recording even for a high coercive force medium and having a high performance by packing a material with highly saturated magnetic flux density in the grooves formed non-parallel to the opposite surfaces of a gap between a core for recording and reproducing and a center core. CONSTITUTION:At the R/W core 1 of a ferrite composed of Mn-Zn, Ni-Zn, etc., and a center core 3, V-shaped grooves A and B are formed. At respective cores 1 and 3, a Sendust or an amorphous alloy are formed as shown by a slanting line F with a sputtering, etc., and the extra material is removed by grinding. The mirror is ground for the cores 1 and 3, a recessed groove C is formed are the non-magnetic material for forming a gap is film-formed. R/W and E cores 1 and 2 are temporarily set with instantaneous adhesives and inserted into a welding jig. A glass rod is inserted to winding windows 4 and 5, and welded integrally in a furnace. The extra glass is ground and removed, finished to the prescribed size, cut and ground and a compound magnetic head is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite magnetic head used for recording and reproduction in, for example, a floppy disk drive, and a method for manufacturing the same.

[Prior Art] FIG. 12 is a perspective view showing a conventional composite magnetic head described in, for example, Japanese Unexamined Patent Publication No. 150215/1982.

In the figure, (la) and (lb) are recording and reproducing cores,
■-type core for recording and playback (hereinafter referred to as L core for R/W, ■ for R/W
(2a) (2b) are erasing cores,
Erasing shaped core (hereinafter referred to as L core for E, eco core for E)
, (4) and (5) are the winding windows of each recording/reproducing core and erasing core, (6), (7), and (8) are non-magnetic reinforcing materials made of glass, etc., (9010) is the E gap, ( 11)
is the R/W gap.

The conventional composite magnetic head having the above configuration is formed by the following manufacturing method. Figure 13 is.

It is a diagram showing the process, first of all, the L core for R/W (1a), the Eco core for R/V (1b), and the L core for E (
2a) and E ecocore (2b) blocks, respectively, into the 13th block.
Glass welding is performed as shown in (a) of the figure. Next, welded and integrated R/W core block (100), E
A track width regulating groove C is provided in each of the core blocks (200) using a processing machine using a rotary grindstone as shown in FIG. 13(b). 200) is vapor-deposited on either core side, and R is attached to the welding jig for the glass mold.
/V core block (100) and E core block (200)
) while aligning the tracks as shown in FIG. 13(C). The temperature of the thus integrated composite magnetic head block (300) is increased to melt the glass on the composite magnetic head block (300) and weld the composite magnetic head block (300) as shown in FIG. 13(d). After that, the excess glass on the surface is removed by polishing, and the surface is made flat as shown in FIG. 13(e). The thus completed composite magnetic head block (300) is then cut by a thin slicing machine, and the chips are cut into the required thickness.
Polishing is performed as shown in Figure (f). Next, the tips of the legs are cut to a desired length of the chip (300a) to obtain the head chip, ie, the composite magnetic head shown in FIG. 12.

[Problems to be Solved by the Invention] Since the conventional composite magnetic head is constructed as described above, the core of ferrite, which is a metal oxide, cannot perform sufficient recording on high coercive force media. There was a problem.

This invention was made to solve the above-mentioned problems, and aims to provide a high-performance composite magnetic head that can perform sufficient recording even on high coercive force media.

[Means for Solving the Problems] The composite magnetic head according to the first aspect of the present invention has grooves non-parallel to the surfaces of the recording/reproducing core and the center core facing the gap between the cores. The groove is filled with a high saturation magnetic flux density material such as sendust or amorphous.

Also, the second aspect of this invention. A method for manufacturing a composite magnetic head according to a third aspect of the present invention includes a step of forming grooves in a recording/reproducing core block and a center core block.

After filling this groove with high saturation magnetic flux density material, it is mirror polished.
Furthermore, there is a process of machining concave grooves in these core blocks, a process of forming a film of non-magnetic material and welding the core blocks together with glass, and a composite magnetic head block formed in this way. A composite magnetic head is manufactured by slicing and lapping.

[Function] The composite magnetic head of the present invention has a high saturation magnetic flux density material embedded in the vicinity of the R/w gap, so sufficient recording can be performed on a high coercive force medium. Since the interface with the material and the gap plane are non-parallel, there is no deterioration in properties due to contour effects.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (1), (2), and (3) are 1Mn-Zn,
A recording/reproducing core (hereinafter referred to as R/11 core), an erasing core (hereinafter referred to as E core), and a center core made of single crystal and polycrystalline materials such as Ni-Zn, (4) (5)
) are the winding windows of these R/V cores (1) and E cores (2), (6) to (10) are non-magnetic reinforcing materials made of glass, etc.
(11) is the R/It gap, (12) and (13) are the E gap, and (14) and (15) are the characteristics of this invention, and are high saturation magnetic flux density materials made of sendust or amorphous alloy, etc., and are ferrite. It is formed into a V-shape so that the boundary surface and the gap surface are non-parallel.

FIG. 2 shows another embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or corresponding parts. The differences in Figure 2 from Figure 1 are the formation state of the non-magnetic reinforcing materials (6) to (10) and the high saturation magnetic flux density material (14) in the R/11 gap.
It has the shape (15).

That is, R/ is filled with non-magnetic reinforcing material (6) (7).
The concave groove for regulating the width of the W track width in the one shown in Figure 1 is formed across the R/W core (1) and the center core (3), whereas the one in Figure 2 is formed across the R/W core (1). ), and is filled with one-way valve magnetic reinforcing materials (8) to (10).

The one in Figure 1 is formed only on the E core (2), while the one in Figure 2 is formed on the E core (2) and the center core (3).
). In addition, high saturation magnetic flux density material (
14) The shape of the groove filled with (15) in Fig. 1 is V-shaped, whereas in Fig. 2 it is U-shaped.

The composite magnetic head shown in FIG. 1 having the above structure can be obtained by an example of the manufacturing method described below. That is, first, a single crystal or polycrystalline ferrite R/W core (1) made of Mn-Zn, Ni-Zn, etc.
and center core (3) [R/W core (1
) and V-shaped grooves A and B for embedding sendust or amorphous alloy in the center core (3) shown in Figure 6.
is provided by grinding. Next, each of these cores (1) (3
) by sputtering sendust or amorphous alloy, or by ion blasting, etc.
It is formed like the shaded area (F) shown in FIG. Then, the excess material of sendust or amorphous alloy is removed by polishing, and the surfaces of the R/W core (1) and center core (3) are finished to a mirror finish as shown in Figures 4 and 7. The W core (1) and center core (3) are machined using a rotating grindstone to create a concave groove C that regulates the track groove for R/W.
is processed as shown in FIGS. 5 and 8. Furthermore, on the surfaces of the mirror-polished R/V core (1) (see Figure 5) and center core (3) (see Figure 8), non-magnetic material such as Sio or At, O, etc. for gap formation is applied. A groove for regulating the track width for E is provided in the primary E core (2) in which a film is formed by sputtering, vapor deposition, etc., and a gap forming material of SiO□ is formed.
, A1□01, etc. are formed by sputtering, vapor deposition, etc. Then, R/v
Temporarily set it with instant adhesive while aligning the tracks of and E.
Insert into welding jig. And winding windows of R/III and E (
4) Insert the glass rods into the glass grooves on the track surface side and the legs in (5), put the whole jig into a welding furnace, raise the temperature, and weld them together. After welding, excess glass is removed by polishing to achieve the desired dimensions and accuracy. The product finished in this way is the desired composite magnetic head core shown in FIG. 9, which is then sliced into thin pieces using a slicing machine and lapped to the required thickness, resulting in the composite magnetic head shown in FIG. is obtained.

The manufacturing method of the composite magnetic head shown in FIG. 2 is almost the same as that of the composite magnetic head shown in FIG.
and that a U-shaped groove is provided in the center core (3), and that the R/
A groove that regulates the track width for W is provided only on the R/W core (1), and a groove that regulates the track width for E is provided on the E core (1).
2) and the only difference is that it is provided in the center core (3). FIG. 10 shows a composite magnetic head core finished in this manner. By slicing this into thin slices and lapping to a desired thickness, a composite magnetic head as shown in FIG. 2 can be obtained.

In the above embodiment, the R/lit gap portion has a V-shape and a U-shape, but as shown in FIG.
(b) The shape shown in (c) may be used. In other words, by making the gap forming surface and the forming surface of the high saturation magnetic flux density material non-parallel, the azimuth loss is increased and the contour is Any shape of the groove may be used as long as it reduces the effect. Further, although the high saturation magnetic flux density material is formed only on the R/lit core, the erasing effect will be further improved if it is also formed on the E core.

[Effects of the Invention] As described above, according to the present invention, a high saturation magnetic flux density material is embedded in a groove shaped non-parallel to the gap on the gap facing surface of each head forming a composite magnetic head.
The present invention has the effect of providing a high-performance composite magnetic head that can perform sufficient recording on a magnetic recording medium, has no deterioration in characteristics due to contour effects, and can significantly improve electromagnetic conversion characteristics.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a composite magnetic head according to one embodiment of the invention, FIG. 2 is a perspective view showing another embodiment of the invention, and FIGS. A perspective view for explaining the manufacturing method of the recording/reproducing core in the invention No. 3, No. 6
Figures to Figure 8 show the center according to the second invention of the present invention, -
FIG. 9 is a perspective view showing a composite magnetic head block obtained by a manufacturing method according to an embodiment of the second invention of the present invention, and FIG. 10 is a perspective view for explaining the manufacturing method of the core. 11(a) to 11(d) are views showing groove shapes according to another embodiment of the invention, and FIG. FIG. 13 is a perspective view showing a conventional composite magnetic head, and FIG. 13 is a perspective view and a sectional view showing a composite magnetic head for explaining a manufacturing method of the conventional composite magnetic head. In the figure, (1) is a recording/reproducing core, (2) is an erasing core, (3) is a center core, (6) to (10) are non-magnetic reinforcing materials, (11) is an R/V gap, ( 14) (1
5) is a high saturation magnetic flux density material, A and B are grooves, and C is a concave groove. Note that the same cylinder numbers in Figure 1 indicate the same or equivalent parts.

Claims (3)

[Claims] (1) In a composite magnetic head formed by integrating a recording/reproducing core, a center core, and an erasing core, on the surface facing the gap between the recording/reproducing core and the center core,
A groove non-parallel to this plane is provided in each of the recording/reproducing core and the center core, and the groove is filled with a high saturation magnetic flux density material made of sendust, amorphous, etc. Composite magnetic head. (2) A process of forming non-parallel grooves on the gap-opposing surfaces of the recording/reproducing core block and the center core block, respectively, and polishing the recording/reproducing core block and the center core block, and applying sendust to these grooves. After filling with a high saturation magnetic flux density material made of amorphous or the like, mirror polishing is performed, and grooves for regulating the recording and reproducing track width are formed in the recording and reproducing core blocks and the center core block, and grooves for regulating the recording and reproducing track width are formed in the erasing core block. A process of additionally machining concave grooves for regulating the erasing track width using A process of polishing and cutting after integrating with glass or adhesive, etc. The composite magnetic head block formed by this process, consisting of the integrated recording/reproducing core block, center core block, and erasing core block, is sliced into predetermined shapes. A method for manufacturing a composite magnetic head comprising the step of lapping the chip to a thickness of . (3) Process of forming and polishing non-parallel grooves on the gap facing surfaces of the recording/reproducing core block and the center core block, respectively, and applying sendust to these grooves. After filling with a high saturation magnetic flux density material made of amorphous or the like, mirror polishing is performed, and grooves for regulating the recording and reproducing track width are formed in the above-mentioned recording and reproducing core block, and grooves are formed in the erasing core block and the center core block. The process of additionally machining concave grooves for regulating the track width for erasing, and then the above-mentioned recording/reproducing core block, center core block,
and a step of forming a film of non-magnetic material on the erasing core block, and polishing and cutting the respective core blocks after integrating them with glass or adhesive, etc., and the integrated recording/reproducing core block formed by this process. , a method for manufacturing a composite magnetic head comprising the steps of slicing a composite magnetic head block consisting of a center core block and an erasing core block and lapping the composite magnetic head block to a predetermined chip thickness.