JP2615557B2 - Composite magnetic head and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a composite magnetic head in which a recording / reproducing head (hereinafter abbreviated as R / W head) and an erasing head (hereinafter abbreviated as ER head) are integrated. And a method for producing the same.

[Conventional technology]

Conventionally, as a composite magnetic head in which an R / W head and an ER head are integrated, the one shown in FIG. 9 (for example, see Japanese Patent Publication No. 60-201515) has been used.
In this figure, 1 is a recording / reproducing core (hereinafter referred to as R / W core), 2 is an erasing core (hereinafter referred to as ER core), 3 is a center core integrating the R / W core 1 and ER core 2, 41
47 to 47 are non-magnetic reinforcing materials which are usually filled with glass. 51 and 52 are R / W winding window and ER winding window respectively, and 61 is R / W winding window.
W gap, 62 and 63 are ER gaps, both SiO ₂ and Al ₂ O ₃
Are formed by sputtering or vapor deposition.

Next, a method for manufacturing a conventional composite magnetic head will be described.

Each core of the R / W core 1, the ER core 2, and the center core 3 is finished to required dimensions and shape by groove processing using a rotary grindstone and polishing processing using various abrasive grains. As an example, FIG.
1 shows a processed product of an R / W core 1 made of a single crystal or polycrystalline ferrite such as -Zn, Ni-Zn. In this figure, 4
a is a groove for filling non-magnetic reinforcing material such as glass, 4b
Is a groove for obtaining a required R / W track TW width, and this portion is filled with a non-magnetic reinforcing material such as glass. In addition,
Before machining the groove 4b shown in FIG. 10, the gap forming surface of each core block of the R / W core 1, the ER core 2 and the center core 3 is mirror-finished by lapping in advance.
Next, a nonmagnetic film such as SiO ₂ or Al ₂ O _{3 is} formed on the gap forming surface by sputtering or vapor deposition.

Next, the core blocks are combined as shown in FIG. In this figure, the same reference numerals as those in FIGS. 9 and 10 denote the same parts, and reference numerals 71 to 74 denote glass rods. Next, the groove 4a of each combined core block, the R / W winding window 51, the ER winding window 5
Glasses 71 to 74 are inserted into 2 and the temperature is increased to weld them together. After the integrated welding, this is sliced and polished so as to obtain a composite magnetic head as shown in FIG.

[Problems to be solved by the invention]

The conventional method for manufacturing a composite magnetic head as described above uses R /
In order to perform groove machining of the W core 1, the ER core 2, and the center core 3 for each core block, align the tracks, and weld the glass, the R / W core 1 and the center core 3 as shown in FIG.
The deviation of the R / W gap 61 between them, the deviation of the ER gaps 62 and 63 between the ER core 2 and the center core 3 as shown in FIG. 13, and the deviation of the R / W track and ER track as shown in FIG. Since the occurrence is unavoidable, it is necessary to precisely process the groove of the narrow track for each core block of the R / W core 1, the ER core 2, and the center core 3, resulting in a long processing time and poor mass productivity. There was a point.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a composite magnetic head which is free from track deviation, can shorten a groove processing time for a narrow track, has high performance and is excellent in mass productivity, and a method of manufacturing the same. The purpose is to obtain.

[Means for Solving the Problems] In a composite magnetic head according to the present invention, a recording / reproducing core and an erasing core are integrated via a center core, and a recording / reproducing core is slid on a sliding surface which slides on a recording medium. In the composite magnetic head having a gap for erasing and a gap for erasing, two grooves obliquely intersecting with the gap between the recording / reproducing core and the center core on the sliding surface; It is provided with two mutually parallel grooves intersecting at right angles to the gap between the core and the center core, and a non-magnetic reinforcing material filled in each of the grooves.

Further, the method for manufacturing a composite magnetic head according to the present invention includes:
Integrating and welding the recording / reproducing core, the erasing core, and the center core having the winding window formed thereon, and at least the erasing core and the center core on the sliding surface of the welded cores with the recording medium. Forming a gap and a plurality of grooves obliquely intersecting the gap between the recording / reproducing core and the center core; and forming the gap between the erasing core and the center core on the sliding surface of the erasing core and the center core. A step of forming at least two grooves perpendicular to the gap, a step of pouring a non-magnetic reinforcing material into each of the grooves, and cutting each of the cores on a line including a groove perpendicular to the gap between the erasing core and the center core And a process.

[Action]

In the composite magnetic head and the method of manufacturing the same according to the present invention, the gap between the erasing core and the center core on the sliding surface and the gap between the recording / reproducing core and the center core on the sliding surface obliquely intersect. The distance on the gap between the recording / reproducing core and the center core between the non-magnetic reinforcing material and the non-magnetic reinforcing material formed in parallel with the non-magnetic reinforcing material and crossing at least the gap between the recording / reproducing core and the center core is recorded. A non-magnetic reinforcing material formed across the gap between the recording / reproducing core and the center core, and both end faces in the direction perpendicular to the gap between the erasing core and the center core and adjacent to these surfaces. The distance on the gap between the erasing core and the non-magnetic reinforcing material formed on both end surfaces of the center core and the center core is the width of the erasing track.

〔Example〕

FIG. 1 is a configuration diagram showing one embodiment of a composite magnetic head according to the present invention. 9, the same reference numerals as those in FIG. 9 denote the same parts, 11 to 19 are non-magnetic reinforcing materials such as glass, and the non-magnetic reinforcing materials 14 and 15 regulate the width of the ER gaps 62 and 63, and Facilitates the regulation of the thickness of the sheet.

Next, an embodiment of a method of manufacturing a composite magnetic head according to the present invention will be described.

FIG. 2 is a view showing one embodiment of the R / W core 1 of the present invention made of a single crystal or polycrystalline ferrite such as Mn-Zn, Ni-Zn, and FIG. 3 is also Mn-Zn, Ni-Zn. FIG. 4 shows an embodiment of the ER core 2 of the present invention made of a single crystal or polycrystalline ferrite such as Mn-Zn, Ni-Z.
FIG. 3 is a view showing one embodiment of a center core 3 of the present invention made of a single crystal or polycrystalline ferrite such as n. In these figures, the same symbols as those in FIG. 9 indicate the same parts,
Reference numerals 8a and 8b denote tapered surfaces serving as glass insertion grooves when the respective core blocks are integrally welded, and reference numeral 9 denotes a groove for pouring glass into a groove formed later in each core block.

First, the respective cores as shown in FIGS. 2, 3 and 4 are formed, and the surface of the R / W core 1 having the R / W winding window 51 and the ER winding window 52 are formed. Since a certain surface and both ends of the center core 3 are gap forming surfaces, they are mirror-finished in advance by lapping before groove processing, and thereafter, the R / W winding window 51, the ER winding window 52, and the tapered surface 8a, 8b is formed by grinding using a rotating grindstone.

Next, as shown in FIG. 5, each of the processed core blocks is integrated and assembled, and bar-shaped glass 71 to 74 is attached to the welded portion.
Insert and raise the temperature to weld. Thereafter, a groove as shown in FIG. 6 is formed on the surface that slides on the recording medium. In this figure, the same reference numerals as those in FIGS. 1 and 5 denote the same parts, 10a is a groove filled with non-magnetic reinforcing materials 11 to 13, 10b is a groove filled with non-magnetic reinforcing materials 14 and 15. is there. here,
The groove 10a is formed obliquely, and the angle is uniquely determined by each track width and the distance between the R / W gap 61 and the ER gaps 62 and 63.

Here, the groove 9 was machined when the R / W core 1 was manufactured. However, after welding and integrating the core blocks, the groove 10 was formed.
It may be processed simultaneously with the processing of a and 10b. The depth of these grooves is usually set to the depth of the apex of the R / W winding window 51 (ER winding window 52), but may be slightly shallower or deeper than this. Thereafter, glass having a lower melting point than the glass 71 to 74 used for welding is inserted into the groove 9 to raise the temperature, and glass is poured into each groove. After such a glass mold, polishing for removing surplus glass is performed to make the sliding surface with the recording medium as shown in FIG. In FIG. 1, the same reference numerals in FIG. 1 indicate the same parts. TRW indicates the R / W track width of the R / W gap 61, and TER indicates the ER track width of the ER gaps 62 and 63. In particular, for high track density recording (for example,
In the case of a narrow track width head (30 μm or less), the overall head chip thickness is set to 200 to 300 to secure mechanical strength.
It is necessary to be μm. In this case, the entire head chip thickness can be set large by increasing the groove width of the groove 10b formed perpendicularly to the erase gap on the sliding surface between the erase core and the center core in the above steps.

Then, as shown in FIG. 7, after the surplus glass is removed, the glass is sliced using a cutting machine such as a wire saw so as to leave the insides of the lines AA 'and BB'. Since the ER track width TER requires high dimensional accuracy of several microns, it is difficult to regulate the thickness of the ER track by the usual method. However, in the present invention, the ER track width as well as regulate the T _ER, to facilitate the size restriction of thickness out. After slicing, the composite magnetic head shown in FIG. 1 can be obtained.

FIG. 8 is a view showing a sliding surface after removing surplus glass in another embodiment of the method of manufacturing a composite magnetic head according to the present invention. In this figure, the same symbols as those in FIG. 7 indicate the same parts.

In this embodiment, the non-magnetic reinforcing members 11, 12, and 13 are connected to the R / W core 1
And the core core 3 is provided only to improve the core efficiency of the ER core 2. Conversely, non-magnetic reinforcing materials 1, 12, 13 are ER
If the core 2 and the center core 3 are provided in a limited manner, the core efficiency of the R / W core 1 can be improved.

[Effects of the Invention] As described above, in the composite magnetic head according to the present invention, the recording / reproducing core and the erasing core are integrated via the center core, and the recording / reproducing core is slid onto the recording medium. In the composite magnetic head having a gap for erasing and a gap for erasing, two grooves obliquely intersecting with the gap between the recording / reproducing core and the center core on the sliding surface; Since two parallel grooves that intersect at right angles with the gap between the core and the center core and the non-magnetic reinforcing material filled in each of the grooves are provided, the width of each gap can be regulated with a small number of grooves, Therefore, it is easy to secure the processing accuracy, and the processing is also easy and the cost is low.

Further, the method for manufacturing a composite magnetic head according to the present invention includes:
Integrating and welding the recording / reproducing core, the erasing core, and the center core having the winding window formed thereon, and at least the erasing core and the center core on the sliding surface of the welded cores with the recording medium. Forming a plurality of parallel grooves obliquely intersecting the gap and the gap between the recording / reproducing core and the center core; and forming a gap between the erasing core and the center core on the sliding surface of the erasing core and the center core. Forming at least two grooves perpendicular to the core, a step of pouring a nonmagnetic reinforcing material into each groove, and a step of cutting each core on a line including a groove perpendicular to the gap between the erasing core and the center core. Therefore, the widths and positions of the recording / reproducing tracks and the erasing tracks are accurate, and the groove processing is facilitated, which is advantageous in that the mass productivity is excellent. At the same time, even in a narrow track width head for high track density recording, the head chip thickness can be increased independently of the track width, so that not only mechanical strength is improved, but also the magnetic path cross-sectional area is increased and magnetic resistance is reduced. There is an advantage that a composite magnetic head having excellent reproduction efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a composite magnetic head according to the present invention, FIG. 2 is a diagram showing one embodiment of an R / W core according to the present invention, and FIG. FIG. 4, FIG. 4 is a view showing an embodiment of the center core, FIGS. 5, 6, and 7 are views for explaining a method of manufacturing the composite magnetic head of the present invention, and FIG. FIG. 9 is a view for explaining another embodiment, FIG. 9 is a structural view showing a conventional composite magnetic head, FIGS. 10 and 11 are views for explaining a manufacturing method thereof, FIGS. FIG. 14 is a view for explaining a conventional problem. In the figure, 1 is an R / W core, 2 is an ER core, 3 is a center core, 8a and 8b are tapered surfaces, 9, 10a and 10b are grooves, 11 to 19 are non-magnetic reinforcing materials, and 51 is an R / W winding. A window, 52 is an ER winding window, 61 is an R / W gap, and 62 and 63 are ER gaps. The same reference numerals in each drawing indicate the same or corresponding parts.

Claims (2)

(57) [Claims] 1. A composite magnetic head in which a recording / reproducing core and an erasing core are integrated via a center core and have a recording / reproducing gap and an erasing gap on a sliding surface sliding with a recording medium. Two parallel grooves obliquely intersecting the gap between the recording / reproducing core and the center core on the sliding surface, and parallel grooves intersecting at right angles to the gap between the erasing core and the center core. Two grooves,
A composite magnetic head, comprising: a non-magnetic reinforcing material filled in each of the grooves. 2. A step of integrally welding a recording / reproducing core, an erasing core and a center core having a processed winding window, and
A plurality of grooves are formed in parallel on at least the gap between the erasing core and the center core and the gap obliquely intersecting with the gap between the recording / reproducing core and the center core on the sliding surface of the welded core with the recording medium. Forming at least two grooves perpendicular to the gap between the erasing core and the center core on the sliding surface of the erasing core and the center core; and pouring a non-magnetic reinforcing material into each of the grooves. Cutting the respective cores on a line including a groove perpendicular to the gap between the erasing core and the center core.