JPH0237512A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To reduce distance between an erasure gap and a read/write gap by forming a second groove to decide the shape of each core after joining a read/write core material, a center more material, and an erasure core material integrally. CONSTITUTION:The center core material 14 is constituted by joining two core materials 41 via a separator 42. First grooves 5 and 6 are formed on the read/ write core material 2 and the erasure core material 3, respectively. The grooves 5 and 6 regulate the depth of the read/write gap 7 and the erasure gap 8 essentially. A core block material 1 is formed by joining integrally core materials 2, 4, and 3. In such a way, the read/write gap 7 and the erasure gap 8 can be formed. The second grooves 9 and 10 are formed on the core materials 2 and 3, respectively. Those grooves 9 and 10 regulate the thickness T of the base part 4a of a center core 40. A third groove 11 to regulate the track width X of the gap 7 on a block material 1 is formed. A filler 14 is filled in the grooves 5, 6 and 11, and the block material 11 is divided to blocks 100 at a position of dotted line, and winding 15, 16 and a back core 17 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of manufacturing a magnetic head, particularly a floppy head.

<Prior Art> A floppy head has a structure in which a read/write core, a center core, and an erase core are joined and integrated into a core block material around the center core, to which windings are attached and a back core is joined.

In recent years, floppy heads have been developed in which the front surfaces of the read/write core and erase core each define one track, and the track width of the erase core is wider than the track width of the read/write core (hereinafter referred to as wide erase or narrow read/write type). Proposed(
1985 IEEE Trans, Magn, MAG
-21,5).

This floppy head has the advantage of high erasing efficiency and improved override characteristics, but on the other hand, a dead space equal to the thickness of the center core is created between the erase gap and the read/write gap, making it difficult for erasing and recording to occur. There is a problem in that a time difference occurs between the two, and a non-recorded portion occurs when the relative movement between the head and the medium is stopped, which hinders high-density recording.

Therefore, in order to make the dead space as small as possible, it is necessary to reduce the thickness of the center core, but in this case, there is a drawback that the strength of the center core decreases and it is easily damaged. In particular, with the conventional manufacturing method of cutting or grinding the read/write core, center core, and erase core into a predetermined core shape and then joining them together, it is difficult to handle the center core in order to prevent it from being damaged. Therefore, in manufacturing wide erase and narrow read/write type floppy heads, there is currently no manufacturing method that can shorten the distance between the erase gap and the read/write gap.

<Problems to be Solved by the Invention> The purpose of the present invention is to solve the above-mentioned drawbacks of the prior art,
It is an object of the present invention to provide a method for manufacturing a magnetic head that can easily manufacture a magnetic head with a short distance between an erase gap and a read/write gap.

Means to solve problems〉 Such objects are achieved by the present invention as described below.

That is, the present invention provides the following for the read/write core material and the erase core material when manufacturing a magnetic head formed by winding the read/write core and the erase core of a core block in which a read/write core, a center core, and an erase core are integrated. , a first groove for substantially defining the depth of the gap with the center core, which is carved diagonally downward from the center core abutting surface to the deep part of the core material; , the read/write core material, the center core material, and the erase core material are joined and integrated around the center core material, and then the bottom of the first groove is connected to the read/write core material and the erase core material from the back part of the core material, respectively. This method of manufacturing a magnetic head is characterized by forming a second groove communicating with the magnetic head.

Further, it is preferable that the second groove is formed so that a portion of the read/write core material and the erase core material remain in the center core material below the first groove.

The core block has one write gap and one erase gap between the read/write core and the center core and between the erase core and the center core, and the track width of the erase gap is the same as that of the read/write gap. Preferably, it is wider than the width of the trough.

Further, it is preferable that the center core material is made by joining two core materials with a separator made of a non-magnetic material interposed therebetween.

In the conventional magnetic head manufacturing method, the read/write core, center core, and erase core are processed into a predetermined shape by cutting or grinding the core material, and then they are joined together. Center core shape in front,
In particular, it was necessary to determine the thickness.

In contrast, in the method of the present invention, the first groove for defining the depth of the cap is formed before the read/write core material, center core material, and erase core material are joined together.
Since the formation of the second groove, which substantially determines the shape of each core, is performed after each core material is joined and fixed together, the coarseness of the center core can be adjusted freely and easily.

In particular, it is easily possible to reduce the thickness of the tip end (front side) of the center core and increase the thickness of the proximal end (back side); in this case, it is possible to increase the strength of the center core while increasing the thickness. , the distance between the erase gap and the read/write gap can be shortened.

<Effects of the Invention> Hereinafter, the method for manufacturing a magnetic head of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

1 to 7 are perspective views showing the steps of the method of manufacturing a magnetic head of the present invention, respectively.

A magnetic head is manufactured by the following steps (1) to (2).

(2) As shown in FIG. 1, a read/write core material 2, a center core material 4, and an erase core material 3, which are elongated in the track width direction, are prepared.

The read/write core material 2 and the erase core material 3 are made of a magnetic material such as ferrite.

The center core material 4 has a structure in which two core materials 41 and 41 made of similar magnetic thin plates are joined via a separator 42 made of a non-magnetic material such as glass or resin. In this way, by forming the center core material 4 into a three-layer laminated structure of core material 41/separator 42/core material 41, crosstalk can be prevented. The thickness TI of the center core material 4 (equal to the thickness of the center core tip 4b) is preferably about 0.1 to 0.3 mm.

Note that the center core material 4 differs from the illustration in that the separator 4
2 may be configured as a single unit.

(2) As shown in FIG. 2, first grooves 5 and 6 are formed in the read/write core material 2 and the erase core material 3, respectively.

The first groove 5 substantially defines the depth of a read/write gap 7, which will be described later, and the first groove 5 substantially defines the depth of a read/write gap 7, which will be described later.
It is formed diagonally downward from the abutting surface 21 with the center core to the innermost part (near the central part) of the read/write core material 2.

The first groove 6 also substantially defines the depth of an erase gap 8, which will be described later, and is formed obliquely downward from the abutting surface 31 with the center core to the innermost part of the erase core 3.

(2) As shown in FIG. 3, a read/write core material 2, a center core material 4, and an erase core material 3 are joined together with the center core 4 in the center to form a core block material 1.
This jointing is performed on both sides of the center core material 4, the abutting surface 21 of the read/write core material 2, and the erase core material 3.
This is done by interposing a filler made of a non-magnetic material such as Sin, glass, or resin between the abutting surfaces 31 of the magnetic material and the abutting surface 31 of the magnetic material, and press-bonding the same. This is the tip of the center core material 4 (
A read/write gap 7 and an erase gap 8 are formed between the front surface side) 4b and the abutting surface 21.31 above the first groove 5.6, respectively.

Note that the gap distance of the read/write gap 7 is 0.2~
Approximately 0.5μm, the depth is 0.01~0.04mm
The distance of the erase gap 8 is preferably about 2 to 5 μm, and the depth is about 0.02 to 0.05 μm.
It is preferable to set it to about mm.

■ As shown in Figure 4, a second
Grooves 9 and 10 are formed.

The second grooves 9 and 10 define the shape of each core material 2.3.4, especially the thickness of the base end 40a of the center core 40, and
The bottoms 51 and 61 of the first grooves 5 and 6 are reached from the back side of the grooves 5 and 6, respectively, and the first grooves 5 and 6 are formed to communicate with the second grooves 9 and 10, respectively.

Since the space between the second grooves 9 and 10 becomes the base end 40a of the center core 40, the thickness of the base end 40a of the center core is determined by selecting the width of the second grooves 9 and 10 in the track direction and the position where they are formed. The length T□ can be adjusted freely and easily.

In particular, as shown in FIG.
It is preferable to form the second grooves 9 and 10 so that a portion of the read/write core material 2 and the erase core material 3 remain at a. In this case, the remaining parts 22 and 32 bonded to both sides of the center core material 4 function as reinforcing materials for the center core 40, thereby increasing the strength of the center core 40 and reducing the thickness T of the center core tip. It is possible to make it thinner, that is, to shorten the distance (dead space) between the read/write gear or knob 7 and the erase gap 8. Furthermore, since the center core is less likely to be damaged during the manufacturing process, the yield of the product is also improved.

Note that the thickness T3 of the base end portion 40a of the center core is 0.4
It is preferable to set it to about 0.8 mm.

(2) As shown in FIG. S, a third groove 11 is formed to define the track width X of the read/write gap 7 of the core block material l.

This groove 11.11 is formed in a tapered shape so as to reach from the front surface of the center core material 4 to the end surface of the core block material on the read/write core side. By forming the grooves IX and 11, the track width Y of the erase gap 8 (see FIG. 6) becomes wider than the track width X of the read/write gap 7, thereby increasing erasing efficiency.

Also, track 11 with erase gap 8! Y is equal to the width of the erase core 30 (see FIG. 6), and is a groove that reaches from the front surface of the center core material 4 to the end surface of the core block material on the erase core side, and its width is wider than the groove 11. A structure may also be adopted in which a narrow fourth groove (not shown) is formed and the track width of the erase gap 8 is defined by this fourth groove.

The first groove 5.6, the second groove 9.10, the third groove 11, and the fourth groove may be formed by cutting, grinding, etc., which is advantageous in manufacturing.

Also, the track widths X and Y of the read/write gap 7 and the erase gap 8 are respectively 0.03 to 0.
．． It is preferably about 2 mm and about 0.04 to 0.3 mm.

The formation pattern and method of forming the third groove 11, the fourth groove, etc. are disclosed in Japanese Patent Application No. 1983, disclosed by the applicant of the present application.
1-042879 and Japanese Patent Application No. 61-045741 can be applied to the present invention.

■ Each of the third grooves 11 (and the fourth groove if necessary) and the apex portion (inside the first grooves 5 and 6 on the center core 40 side) 12 and 13 are filled with the same filler 14 as described above. Then, the core block material 1 shown in FIG. 5 is cut at the positions indicated by dotted lines in the figure to divide it into several units of core blocks 100 shown in FIG. 6.

Note that the filling material 14 may be filled after the core block 100 is divided.

- As shown in FIG. 7, appropriate windings 15 and 16 are applied to the read/write core 20 and erase core 30 of the core block 100, respectively, and then each core 20, 40 and 30
A back core 17 connecting the proximal ends of the two is joined. This completes the magnetic head.

The windings 15 and 16 can be installed not only by winding them directly around the core but also by attaching them to a bobbin.

Although the present invention has been described above with respect to the manufacture of full erase magnetic heads of wide erase and narrow read/write types, the present invention is not limited to this and can be applied to the manufacture of other types of magnetic heads.

Further, the magnetic head manufactured according to the present invention can be used not only as a floppy head but also as a streamer head for wide erase and narrow read/write.

<Effects of the Invention> According to the method for manufacturing a magnetic head of the present invention, after the read/write core material, center core material, and erase core material are joined and fixed together, the formation of the second groove that substantially determines the shape of each core is performed. Therefore, the thickness of the center core can be freely and easily adjusted, and the yield of the product can be improved. In particular, by forming the second groove so that a portion of the read/write core material and the erase core material remain at the proximal end of the center core material, the thickness of the distal end of the center core can be reduced, and the thickness of the proximal end can be reduced. In this case, it is possible to easily manufacture a magnetic head that has a high center core strength, has a small dead space between the erase gap and the read/write gap, and is excellent in high-density recording.

[Brief explanation of the drawing]

1 to 7 are perspective views showing the steps of the method of manufacturing a magnetic head of the present invention, respectively. Explanation of symbols 1... Core block material, 100... Core block, 2... Read/write core material, 20... Read/write core, 3... Erase core material, 30... Erase core, 21. 31...Abutment surface, 22.32...Remaining part, 4...Center core material, 40...Center core, 4a...Base end part, 4b...Tip part, 40a...Center core base end, 41... core material; 42... Separator, 5.6... First groove, 51.61... Bottom. 7... Read/write gap, 8... Erase gap, 9.10... Second groove, 11... Third groove, 12.13... Apex portion, 14... Filler, 15.16...Winding, 17...Back core G IG IG 1°F G, 5 FIG, 6

Claims (4)

[Claims] (1) When manufacturing a magnetic head formed by winding the read/write core and the erase core of a core block in which a read/write core, a center core, and an erase core are integrated, a center core is used for the read/write core material and the erase core material, respectively. A first groove is formed to substantially define the depth of the gap between the center core material and the center core material. A read/write core material, a center core material, and an erase core material are joined and integrated, and then a second groove is connected to the read/write core material and the erase core material, respectively, from the back portion of the core material to the bottom of the first groove. A method of manufacturing a magnetic head characterized by forming grooves. (2) The method of manufacturing a magnetic head according to claim 1, wherein the second groove is formed so that a portion of the read/write core material and the erase core material remain in the center core material below the first groove. (3) The core block is arranged between the read/write core and the center core and between the erase core and the center core.
3. The method of manufacturing a magnetic head according to claim 1, wherein each has one read/write gap and one erase gap, and the track width of the erase gap is wider than the track width of the read/write gap. (4) Claims 1 to 4, wherein the center core material is made by joining two core materials via a separator made of a non-magnetic material.
3. The method for manufacturing a magnetic head according to any one of 3.