JPS63195814A - Magnetic head core and its production - Google Patents

Abstract

PURPOSE:To obtain a tunnel erasing type magnetic head appropriate for narrow track formation by regulating the track width of a recording/reproducing gap and an erasing gap and their relative positions by three grooves formed on a magnetic recording medium sliding face. CONSTITUTION:Cores 4, 5 and cores 5, 6 respectively constitute a recording/ reproducing core and a erasing core and these cores are unitedly deposited and joined with glass 9 to form a head core 10. A recording/reproducing gap 1 and erasing gaps 2, 3 are formed on the recording medium sliding face 11 of the core 10 as follows. Namely, V-shaped glass grooves 7, 7' and a glass groove 8 entered into the grooves 7, 7' and extended in the sliding direction are formed and the gaps 1-3 are regulated by these grooves 7, 7', 8, so that the relative positions and the width of the gaps can be accurately determined. Consequently, the magnetic head appropriate for narrow track formation can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head core constituting a magnetic head for magnetically recording or reproducing information on a magnetic recording medium, and a method for manufacturing the same, and particularly relates to a magnetic head core that constitutes a magnetic head that magnetically records or reproduces information on a magnetic recording medium, and particularly relates to a magnetic head core that constitutes a magnetic head that magnetically records or reproduces information on a magnetic recording medium, and a method for manufacturing the same. A magnetic core in which a second magnetic gap is provided behind the first magnetic gap in the medium sliding direction, for example, a magnetic head core of a tunnel erasing magnetic head used in a digital signal recording/reproducing device such as a floppy disk drive device; This relates to a manufacturing method.

[Prior Art] FIGS. 5 and 6 each explain the structure of a conventional tunnel erase type magnetic head core, and schematically show the sliding surface of the magnetic recording medium of the magnetic head core.

In FIG. 5, reference numeral 101 denotes a recording/reproducing core, and reference numeral 102
, 103 are erasing cores, each of which is a recording/reproducing gap 101a and an erasing gap 102a formed in a thin plate shape from ferrite or the like.

103a is provided. Further, numerals 104 to 106 are spacers. This magnetic head core is the recording/reproducing core 1
01 and the spacer 106, and the erase core 10
A total of three cores, ie, cores having spacers 104 and 105 coupled to the cores 2 and 103, are connected to each gap 101a to 103.
It is constructed by aligning the relative positions of a and then joining.

FIG. 6 shows a so-called bulk type magnetic head core, which is constructed by abutting and joining a recording/reproducing core 107 and an erasing core 108, which are formed into plate shapes with the same thickness. The recording/reproducing core 107 has a recording/reproducing gap 1.
07a is formed, and the track width of this gap 107a is defined by grooves 107b and 107c formed on both sides thereof. Further, two erase gaps 108a and 108b are formed in the erase core, and both gaps 108a and 108 are formed by a groove 108c formed between them.
The track width and spacing of b are defined. groove 107b,
107c and 108C are filled with glass 109 for welding.

[Problems to be Solved by the Invention] In the magnetic head core shown in FIG.
03 and spacers 104 to 106 are required, and a gap 101a is required.

It cannot be said that alignment of 102a and 103a is easy.

Further, when narrowing the track to increase recording density, in a structure in which the thickness of each core 101-103 is equal to the width of each track, each core 101-103 must be made thinner. Therefore, in the manufacturing process, each core 101-
103 became increasingly difficult to handle, cracks in the core,
There is a problem in that the yield rate deteriorates due to factors such as cracks.

On the other hand, in the magnetic head core shown in FIG. 6, it is easy to narrow the track. However, even with this head core, both cores are 107 and 10.
8, each gap 107a, 108a at the time of butting and joining
, 108b is required.

As is the case with the structure shown in Figure 5, in the structure shown in Figure 6, the misalignment of the relative positions of the gears and gears cannot be avoided in the manufacturing method, and this misalignment must be suppressed during the manufacturing process along with the alignment process described above. management is required, and this point is an obstacle to reducing manufacturing costs.

[Means for Solving the Problems] In order to solve these problems, according to the present invention, a second magnetic gap is provided behind the first magnetic gap in the medium sliding direction on the magnetic recording medium sliding surface. In the magnetic head core in which the sliding surface is provided with the gaps therebetween, first and second grooves intersect with each other, and a groove passes between the first and second grooves and the second magnetic gap in the medium sliding direction. A structure is adopted in which an extending third groove is provided, and the first to third grooves define the track width of each gap and the relative positions thereof.

Further, in the method for manufacturing a magnetic head core according to the present invention, a step of joining a plurality of magnetic pieces to obtain a magnetic block having first and second magnetic gaps as a magnetic block from which the main body of the magnetic head core is cut out; forming a pair of mutually intersecting grooves defining track widths and relative positions of the first and second magnetic gaps of the head core on a surface of the block corresponding to the magnetic recording medium sliding surface of the head core; Then, a structure is adopted which includes a step of filling several blocks with a non-magnetic material and then cutting the block to a predetermined thickness to obtain the main body of the head core.

□ [Function] According to the structure of the magnetic head core as described above, the relative positions of the first magnetic gap and the second magnetic gap are determined by adjusting the relative positions of the first magnetic gap and the second magnetic gap to the above-mentioned sliding surface instead of the conventional butt alignment. It is defined by each groove formed, and is defined with high precision without positional deviation.

Further, according to the configuration of the manufacturing method as described above, after the magnetic pieces are butted and joined, grooves are formed to define the track width of each magnetic gap and their relative positions,
When the magnetic pieces are butted together, there is no need to align the relative positions of each gap, which simplifies the process.

[Example] Hereinafter, details of an example of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 shows the structure of a main body (hereinafter referred to as a head core main body) of a tunnel erase type magnetic head core according to an embodiment of the present invention.

The head core body, whose entire body is designated by the symbol IO, is constructed as a type of bulk type, and consists of three cores 4 to 4 of the same thickness.
6, L-shaped cores 4 and 6 are butted against each side of a straight core 5, and glass 9 is welded to join them. Core 4 is core 5 and both cores 4,
A back core (not shown) coupled to the lower end of FIG. The core 6 also serves as a remagnetizing circuit for recording/reproducing and erasing, and a back core (not shown) constitutes an erasing core through which erasing magnetic flux flows.

The upper surface of the head core body 10 in the drawing is formed as a magnetic recording medium sliding surface (hereinafter abbreviated as sliding surface) 11 on which a magnetic recording medium (not shown) slides in the direction of arrow A. This sliding surface 1
1, a recording/reproducing gap 1 is formed between the abutting surfaces of the cores 4 and 5, and two erasing gaps 2 and 3 are formed between the abutting surfaces of the cores 5 and 6.

In addition, the sliding surface 11 has first to third linear glass grooves 7, 7' and 8 filled with glass 9, which is a non-magnetic material.
is formed by grinding with a whetstone.

The first and second glass grooves 7, 7' are formed on the sliding surface 11 from the upstream end in the sliding direction A to an area slightly downstream of the erasing gap 2.3, and are located in the recording/reproducing gap 1.
They are formed so as to intersect with each other at a predetermined angle on the more upstream side, with gaps 1 to 3 interposed therebetween.

Further, the third glass groove 8 is formed in the sliding surface 11 so as to pass between the erase gaps 2.3 and extend in the A direction to the downstream end of the sliding surface 11.

The first and second glass grooves 7, 7' form both ends of the recording/reproducing gap 1 in the track width direction as well as the erasing gaps 2, 3.
The outer end in the track width direction is defined. The third glass groove 8 also defines the inner ends and intervals of the erase gaps 2 and 3. That is, the glass grooves 7, 7', 8 define the track width of each gap 1-3 as well as their relative positions with respect to each other.

It should be noted that the parts indicated by numerals 12 and 13 on the sliding surface 11 are the uncut parts when forming the glass grooves 7 and 7', respectively, and the width of the grindstone that forms the glass grooves 7 and 7' is small.
Alternatively, this occurs when the thickness of the cores 4 to 6 is large, and is not particularly functionally necessary.

A magnetic head core is constructed by coupling a back core (not shown) to the lower ends of the cores 4 to 6 in the figure of the head core body 10, and further winding coils for recording/reproducing and erasing (not shown) around this. , a slider (not shown) are joined to form a magnetic head.

According to the structure of the head core body 10 of this embodiment as described above, the relative positions of the recording/reproducing gap 1 and the erasing gaps 2 and 3 are the glass grooves 7.7'.

8, and can be defined with high precision without positional deviation without relying on butt alignment as in the conventional example, and the recording track width can be accurately managed.

Further, the head core body 1O of this embodiment is a type of bulk type, and there is no difficulty in achieving a narrow track as in the conventional example shown in FIG. 5, and the track can be easily narrowed.

In the above structure, the glass grooves 7, 7' and 8 may be filled with other suitable non-magnetic material instead of the glass 9.

Next, a method of manufacturing the head core body 10 of this embodiment will be explained with reference to FIGS. 2(A) to 2(E).

In FIG. 2(A), numerals 21 to 23 each represent a magnetic piece made of a soft magnetic material such as ferrite,
Each corresponds to a plurality of cores 4 and 6.5 of the head core body IO. In the manufacturing process of this embodiment, first, these magnetic pieces 21 to 23 are butted together as shown in the figure, and then joined by welding glass 9 through a magnetic gap material.
A magnetic block 30 from which the head core body 10 is cut out is obtained. At this time, in the magnetic block 30, the magnetic piece 21.
Two magnetic gaps Gl and G2 are formed between 23 and 22.23, which are the recording/reproducing gap 1 and erasing gap 2.3, respectively.

Next, as shown in FIG. 2(B), the aforementioned third glass grooves 8 are formed in the upper surface 30a of the magnetic block 30 in parallel at equal intervals by grinding with a grindstone or the like.

The glass groove 8 may be cut diagonally or perpendicularly to the upper surface 30a.

Next, as shown in FIG. 2(C), the above-mentioned first glass grooves 7 are formed in the upper surface 30a of the magnetic block 30 at a predetermined depth shallower than the glass grooves 8 and in parallel at equal intervals.

Furthermore, as shown in FIG. 2(D), second glass grooves 7' are formed in parallel at equal intervals on the upper surface 30a.

Next, as shown in Fig. 2(E), each glass groove 7°7', 8
After being filled with glass 9, the magnetic block 30 is cut along cutting lines a, b, and c to a predetermined thickness to obtain the head core body 10 of this embodiment.

According to such a manufacturing method, after the magnetic pieces 21 to 23 are butted and joined, the glass grooves 7, 7' and 8 that define the track width of each gap 1 to 3 and their relative positions are formed, There is no need to align the gaps 1-3 when the magnetic pieces 21-23 are butted together, which simplifies the process and reduces manufacturing costs. In addition, there is no positional deviation of each gap 1 to 3 due to positional deviation at the time of butting, and the relative position of each gap 1 to 3 is 7°7',
It is produced with high precision due to the precision of the machining process. Track width can be managed easily and accurately.

By the way, in the head core body IO of this embodiment, the magnetic circuits for recording and reproduction and for erasing are connected to each other at the core 5 portion. In such a structure, peak shift due to crosstalk during DC erasure may pose a problem during recording.

To solve this problem, a structure of the head core body 10 as shown in FIG. 3 or 4 may be considered as another embodiment of the present invention.

In the structure of FIG. 3, a central core corresponding to the core 5 of FIG. 1 is connected to a core 14 on the magnetic circuit side for recording/reproduction and a core 15 on the magnetic circuit side for erasing via an adhesive layer 16 serving as an insulating layer. separated into

Furthermore, in the structure shown in FIG. 4, a non-magnetic material is filled in the central core 5', which corresponds to the core 5 in FIG. 1, to separate the upper half of the core into a recording/reproducing magnetic circuit side and an erasing magnetic circuit side. A glass groove 17 is formed.

With the structure shown in FIGS. 3 and 4, magnetic circuits for recording/reproducing and erasing can be separated, and the above-mentioned problem of peak shift due to crosstalk can be solved.

[Effects of the Invention] As is clear from the above description, the present invention provides a magnetic head core in which the second magnetic gap is provided behind the first magnetic gap in the medium sliding direction on the magnetic recording medium sliding surface. , first and second grooves intersecting each other with the gaps sandwiched between them on the sliding surface, and a third groove extending in the medium sliding direction passing between the second magnetic gaps. is provided, and the first to third grooves define the track width of each gap as well as the relative position of each gap, so that the track width of each gap and the relative position of each gap can be easily defined. Can be carried out with high precision, can be managed accurately,
It is also easy to narrow the track.

Further, according to the method for manufacturing a magnetic head core of the present invention, a step of joining a plurality of magnetic material pieces to obtain a magnetic material block having first and second magnetic gaps as a magnetic material block from which the main body of the magnetic head core is cut out. , in the block, a pair of intersecting grooves defining track widths and relative positions of the first and second magnetic gaps of the head core are formed on a surface of the head core corresponding to the sliding surface of the magnetic recording medium; The structure includes the step of filling several sections with a non-magnetic material and then cutting the block to a predetermined thickness to obtain the main body of the head core, so that the track width of each gap and the relative position of each gap can be adjusted. An excellent magnetic head core defined with high precision can be easily manufactured at low cost through a small number of steps.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a magnetic head core body according to an embodiment of the present invention, and FIGS. 3 and 4 are perspective views of magnetic head core bodies according to different embodiments of the present invention, and FIGS. 5 and 6 are illustrations of different structures of conventional magnetic head cores, respectively. 1... Recording/reproducing gap 2.3... Erasing gap 4-6... Core 7.7', 8... Glass groove 9... Glass 10... Head core body 1
1...Sliding surface 21-23...Magnetic piece 30...Magnetic block

Claims (1)

[Scope of Claims] 1) In a magnetic head core in which a second magnetic gap is provided behind the first magnetic gap in the medium sliding direction on a magnetic recording medium sliding surface, the magnetic head core has a second magnetic gap provided between the sliding surface and the first magnetic gap in the medium sliding direction. first and second grooves that intersect with each other with each gap in between, and a third groove that passes between the second magnetic gaps and extends in the medium sliding direction, and the first to third grooves A magnetic head core characterized in that the track width of each gap and the relative position thereof are defined by: 2) Obtaining a magnetic block having first and second magnetic gaps as a magnetic block from which the main body of the magnetic head core is cut out by joining a plurality of magnetic pieces, and in the block, forming a magnetic recording medium of the head core. forming a pair of intersecting grooves defining the track widths and relative positions of the first and second magnetic gaps of the head core on a surface corresponding to the sliding surface; and applying a non-magnetic material to the grooves. A method for manufacturing a magnetic head core, comprising the step of cutting the block to a predetermined thickness after filling the block to obtain a main body of the head core.