JPS63263611A - Magnetic head core and its production - Google Patents

Abstract

PURPOSE:To easily form the joint surfaces to a nonmagnetic plate having a thickness to define a magnetic gap by joining a front part core and U-shaped rear part core sandwiching the nonmagnetic plate in such a manner that nearly a square shape is formed as a whole. CONSTITUTION:A magnetic head 11 consists of the front part core 12, the rear part core 13 and a coil 14 and is formed to nearly the square shape as a whole. The core 12 is formed by joining a pair of magnetic members 16, 17 consisting of magnetic materials so as to sandwich the nonmagnetic plate 15 having the thickness to define the magnetic gap (a). On the other hand, the core 13 consisting of the magnetic material has the U shape; after the front end faces of the U shape are joined to the end of the rear face of the core 12, the coil 14 is wound on the core 13. A pair of the magnetic plates 16, 17 are joined only by the contact surfaces with the plate 15 at the time of forming the core 12 according to this constitution. The joint surfaces of these plates 16, 17 are, therefore, easily formed and are improved in the accuracy. The production of the head 11 is thus facilitated.

Description

[Detailed Description of the Invention] [Summary] A magnetic head for reading and writing desired information on a storage medium includes a front core with a magnetic gap and a U-shaped rear core so that the whole is approximately in the shape of an opening. After creating a magnetic head core formed by joining the front cores, a joining member that can be divided into a plurality of front cores, and a magnetic material block that can be divided into a plurality of rear cores, The present invention provides a method for manufacturing the magnetic head core in which the rear core is joined, and improves the productivity of the magnetic head.

[Industrial application field]

The present invention reads/writes (R) storage information in a storage medium.
The present invention relates to a magnetic head, particularly a structure that improves productivity, and a manufacturing method thereof.

[Conventional technology]

FIG. 4 is a schematic perspective view showing the structure of a magnetic head according to the prior art, and FIG. 5 is a perspective view illustrating a method of manufacturing the core shown in FIG. 4.

In FIG. 4, a magnetic head 1 consists of a pair of C-shaped cores (magnetic members) 2.3, a non-magnetic plate 4 that defines the width a of the magnetic gap, and a coil 5.

A pair of cores 2.3 formed in a C-shape and facing each other are joined at the upper part with a non-magnetic plate 4 in between, and directly joined at the lower part, and are integrated so that the whole becomes approximately a mouth shape. .

In such a magnetic head 1, a plurality of cores 2 and 3
For example, as shown in FIG. 5, the magnetic material block 6, which can be divided into
It is formed by removing the top end surface of the C shape.

[Problem that the invention seeks to solve]

As explained above, a conventional magnetic head core consists of a pair of U-shaped cores and a non-magnetic plate, and the surface to which the non-magnetic plate is sandwiched and bonded during the manufacturing process of the core and the surface to which the pair of cores are directly bonded are: It is necessary to process the steps to be parallel and accurate.

However, it is unavoidable that manufacturing errors occur in the parallelism and step dimensions, and especially when formed into a magnetic material block that can be divided into a plurality of U-shaped cores to increase productivity, the manufacturing errors occur. Therefore, there were problems in that it became difficult for the joint surfaces to come into surface contact, and that it was difficult to control the magnetic gap a.

[Means for solving problems]

The present invention, which aims to eliminate the above-mentioned problems, has a non-magnetic plate 15 having a thickness that defines a magnetic gap a, which is sandwiched in the thickness direction of the non-magnetic plate 15 according to the embodiment shown in FIG. Second magnetic member 16.
17, and a front core 12 formed by joining the contact surfaces of the first magnetic member 16 and the non-magnetic plate 15 and the contact surfaces of the second magnetic member 17 and the non-magnetic plate 15; Rear core 1 formed by forming a third magnetic member into a substantially U-shape
3, and a magnetic head core 11 characterized in that it is formed by joining a front core 12 and a rear core 13 so that the whole has a substantially mouth-shaped shape, and a plate having a thickness that defines a magnetic gap a. a step of forming a non-magnetic member in the shape of a first member having an abutment surface that abuts against a surface in the thickness direction of the non-magnetic member; a step of forming a second magnetic material block; a contact surface between one surface of the non-magnetic member in the thickness direction and the first magnetic material block; and a contact surface of the non-magnetic member with the other surface of the non-magnetic member in the thickness direction; A first joining step in which the contact surfaces of the second magnetic material block are brought into contact with and joined to each other, a step in which a third magnetic material block is formed into a U-shaped cross section, and the second magnetic material block is integrated in the first joining step. A first dividing step of forming the front core 12 by dividing the bonded member so that each block includes the magnetic gap of a predetermined length; It is characterized by including a second dividing step of dividing into thicknesses to form the rear core 13, and a second joining step of joining the front core 12 and the rear core 13 so that the whole has a substantially mouth shape. This is a method of manufacturing a magnetic head core.

[Effect]

The magnetic head core and the method for manufacturing the same according to the above means include a front core formed by joining a pair of magnetic members with a non-magnetic plate for regulating a magnetic gap in between, and a mouth-shaped rear core; When creating the core, the pair of magnetic members are joined only at the contact surfaces with the non-magnetic plate. Therefore, the bonding surface of the magnetic member is easy to form and has high precision, making manufacturing of the magnetic head core easier than with conventional configurations, and the magnetic gap has high precision and small variations, increasing the reliability of the magnetic head. Improved.

〔Example〕

EMBODIMENT OF THE INVENTION Below, the magnetic head core of this invention and its manufacturing method are demonstrated using drawings.

FIG. 1 is a schematic perspective view of a magnetic head according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a magnetic head according to another embodiment of the present invention, and FIG. 3 is a fabrication of the front core shown in FIG. 11. It is a perspective view showing a process.

In FIG. 1, a magnetic head 11 consists of a front core 12, a rear core 13, and a coil 14, and the whole has a substantially mouth-shaped shape.

A rod-shaped front core 12 with a square cross section is sandwiched between non-magnetic plates 15 made of beryllinium copper, titanium, stainless steel, etc. and having a thickness that defines the magnetic gear knob a. It is formed by joining a pair of magnetic members 16 and 17 made of magnetic material. However, the width of the front core 12 defines the length of the magnetic gear 7a, and the recess 18 with a V-shaped cross section formed on the lower surface of the front core 12
This is for defining the depth of the magnetic gap a.

The rear core 13 made of a magnetic material such as permalloy, sendust, or magnetic metal is in the shape of an opening, and after the tip of the opening is joined to the lower end of the front core 12, the coil 14 is wound around the rear core 13. Then, the magnetic head 11 is completed.

In FIG. 2, the magnetic head 21 consists of a front core 22, a rear core 23, and a coil 24, and the whole has a substantially mouth-shaped shape.

The front core 22 in the shape of a square is made of beryllium copper.

A pair of magnetic members 26 and 27 formed in an L-shape from a magnetic material such as permalloy, sendust, or magnetic metal, sandwiching a non-magnetic plate 25 made of a non-magnetic material such as titanium or stainless steel and having a thickness that defines a magnetic gap a. It is made by joining. However, the width of the front core 22 defines the length of the magnetic gap a, and the recess 28 with a ■-shaped cross section formed on the lower surface of the front core 22 defines the depth of the magnetic gap a. It is something.

The rear core 23 made of a magnetic material such as permalloy or sendust magnetic metal has a square shape, and after joining the front core 22 and the rear core 23 to each other, the coil 24 is wound around the rear core 23. The magnetic head 21 is completed.

In Figure 3 (a), Permalloin Sendust.

a magnetic material block 31 that is made of a magnetic material such as magnetic metal and can collect a plurality of magnetic members 16 in a matrix;
A plurality of magnetic members 17 made of magnetic materials such as permalloy, sendust, and magnetic metals can be collected in a matrix. A magnetic material block 32 is made of a non-magnetic material such as beryllium copper, titanium, and stainless steel. Magnetic plate 15
A plate-shaped non-magnetic member 33 that can be collected in a matrix shape.
form. At that time, both surfaces (joining surfaces) in the thickness direction of the non-magnetic member 33 formed to a thickness that defines the magnetic gap a, and the magnetic material block 31 facing the non-magnetic member 33.
The opposing surface (joint surface) of No. 32 is processed into a flat surface with few irregularities by lapping or the like.

In FIG. 3(0), a pair of magnetic material blocks 31 and 32 are brought into contact with each other with a non-magnetic member 33 in between, and each contact surface is joined by thermocompression bonding or the like to create a joining member 34. 34 in its thickness direction to obtain a connecting plate 35 in which a plurality of front cores 12 are connected in parallel, as shown in FIG. 3(C).

Next, the connecting plate 35 is divided, as shown in FIG. 3 (=).
After forming the divided pieces 36 to the outer dimensions of the front core 12, a recess 18 is formed as shown in FIG.
is completed.

On the other hand, the mouth-shaped rear core 23 is formed by forming a magnetic material block (not shown) having a length in the thickness direction.
It is formed by dividing the magnetic material block.

Next, the rear core 23 is bonded to the lower surface of the front core 12 by thermocompression bonding or the like so that the whole has an opening shape, thereby completing the magnetic head core.

〔Effect of the invention〕

As explained above, according to the present invention, the bonding surface with the non-magnetic plate that defines the magnetic gap can be formed easily and with high precision, making it easy to manufacture the magnetic head core, and the dimensions of the magnetic gap can be made with high precision. This has the effect of reducing variations and improving reliability of the magnetic head.

[Brief explanation of drawings]

1 is a schematic perspective view of a magnetic head according to one embodiment of the present invention, FIG. 2 is a schematic perspective view of a magnetic head according to another embodiment of the present invention, and FIG. 3 is a schematic perspective view of a magnetic head according to another embodiment of the present invention. FIG. 4 is a schematic perspective view showing the configuration of a magnetic head according to the prior art; FIG. 5 is a perspective view illustrating a method for manufacturing the core shown in FIG. 4. In the figure, 11.21 is a magnetic head, 12.22 is a front core, 13
．． 23 is the rear core, 15.25 is the non-magnetic plate, 16.1
? , 26.27 is a magnetic member, 31.32 is a magnetic material block, 33 is a non-magnetic member, and a is a magnetic gap. Bokuto vA's Guest of the Land Ichizu 4 Romki Head I) Enemy 1be Zangenme) 1 & 2 Meguan Go 1; Tsume Chona 1" Genshu 31

Claims (2)

[Claims] (1) A non-magnetic plate (with a thickness that defines the magnetic gap (a)
15, 25) in the thickness direction and abut the first and second magnetic members (16, 17, 26, 27), and the first magnetic member (16, 26) and the non-magnetic plate (15, 25), and a front core (12, 22) formed by joining the contact surfaces of the second magnetic member (17, 27) and the non-magnetic plate (15, 25); and a rear core (13, 23) formed by forming the magnetic member No. 3 into a substantially U-shape, and the front core (12, 2
2) and the rear core (13, 23) are joined together. (2) forming a non-magnetic member (33) in a plate shape with a thickness that defines the magnetic gap (a); and a contact surface that comes into contact with a surface in the thickness direction of the non-magnetic member (33). a step of forming first and second magnetic material blocks (31, 32), a contact surface between one surface in the thickness direction of the non-magnetic member (33) and the first magnetic material block (31); , the other surface of the non-magnetic member (33) in the thickness direction and the contact surface of the second magnetic material block (32) are brought into contact with each other and joined together.
a step of forming a third magnetic material block having a U-shaped cross section; and a joining member (34) integrated in the first joining step.
A first dividing step of forming a front core (12) by dividing the magnetic gap of a predetermined length into each block, and dividing the third magnetic material block into a thickness approximately equal to the length of the magnetic gap. a second dividing step of dividing to form a rear core (13); and a second joining step of joining the front core (12) and the rear core (13) so that the whole is approximately square-shaped. A method of manufacturing a magnetic head core, comprising: