JPS61216105A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head which has the high mass productivity with high efficiency and low cost by filling a magnetic substance into the grooves of a substrate to form a back core and laminating a holding matter onto a core layer. CONSTITUTION:Plural recessed grooves 5a are formed on a substrate 5, and a magnetic material like 'Sendust(R)', etc. is filled into these grooves 5a with the same depth as the groove 5a. The upper parts of the grooves 5a are polished for formation of a back core 6 of a magnetic substance over the grooves 5a. Then a magnetic film is coated for formation of a core 7 with the thickness equal to the magnetic track width. Plural sheets of the substrate 5 containing the core 7 are laminated and adhered by means of the glass G1 having a low melting point. Thus a lamination block 8 is obtained. This block 8 is cut vertically into lamination materials 9 used for a magnetic element. Then the material 9 is cut in the gap direction into lamination half bodies 9a and 9b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head, and more particularly to a magnetic head that has a magnetic thin film as its core and is highly efficient and excellent in mass production.

(Prior Art) In recent years, with the trend toward higher density magnetic recording and reproducing devices, there has been an increasing demand for narrower tracks in magnetic media.

To cope with this, there is a magnetic head whose core is mainly a magnetic thin film.

FIG. 9 is a perspective view of a conventional 1q magnetic head;
FIG. 10 is an exploded perspective view of the components of the magnetic head in the process of manufacturing the magnetic head of FIG. 9.

In both figures, the magnetic layer 11! J. Core half-vacation 20
and 21 are integrally formed by vapor deposition or the like on substrates 22 and 23 made of non-magnetic material such as ceramic, for example, in order to hold them. =l The core half-break 2 and the substrate 22 have a notch 20a on one side thereof for winding a winding wire,
22a h＜Established.

The half body 20 and the half body 2, which are integrally formed with the substrate 22 and the substrate 23, have opposing inner surfaces brought into contact with each other to form a hook portion 24 that contacts the magnetic medium. 25 is a holder made of, for example, ferrite, which is made of a composite mold with magnetic medium glue and the first contact part made of a non-magnetic material, and the core half holes 0 and 21 are attached to the upper side with adhesive or the like. Ru.

That is, the holding body 25 is connected to the gap portion 24 by the cliff body 20
and 21 to prevent magnetic short circuit: %': The front part 258 near the P-shaped part 24 has one non-R eye, and is made of glass that will wear easily even if it comes into contact with a magnetic medium, and the rear part 25
h is a magnetic material, for example, Ferray i-, which is used to reduce magnetic loss.

Winding windows 25c are provided in the holder 25 at positions corresponding to the notches 20a and 22a in the core half body 20 and the substrate 22.

In this way, the board 22.23 is connected to the core half-off 2
021 Dobo 1. ! After the J body 25 is re-integrated with the adhesive, the surface in contact with the magnetic medium is polished to a mirror finish, and the ninth
A magnetic head as shown is formed.

(Problems to be Solved by the Invention) However, in such a conventional magnetic head, the core halves 20 and 21 are made of a magnetic thin film, the holder 25 is made of a fly 1, and the holder 25 is made of a non-magnetic material. Substrate 22, glass etc. glI magnet 1! Front part 25 consisting of I body
A is a different type + A, so they must be matched, and non-141 t'1 boards are wear-resistant ↑ (
1, and can be bonded to glass with non-magnetic substrates), and these have matching thermal expansion coefficients! It would have been technically impossible to satisfy all the requirements at the same time, so a compromise had to be made somewhere.

In addition, the number of parts was large, and due to the structure, it was inconvenient for production and also had problems in terms of cost.

(Means for Solving the Problems) In order to solve the problems mentioned in (2), the present invention forms a vortex of a predetermined shape on a substrate made of a non-magnetic material, and then fills the substrate with a magnetic material. A magnetic head is characterized in that a back core is formed, a layer made of a magnetic material is deposited from the upper part of the back core, and a holding body made of a non-magnetic material is laminated on the upper part of the core layer. It provides:

(Embodiment) FIG. 1 is an exploded perspective view showing an embodiment of the magnetic head of the present invention. Reference numeral 1 denotes a substrate made of a non-magnetic material such as ceramic, and this substrate 1 has a back core to be described later. A corresponding shape 11a and a notch 1b for winding are provided by etching, laser processing, etc. In the groove 1a, for example, there is a magnet ↑ such as Sendas 1~ or gold a Ill material.
After filling the backing material to a depth equal to or greater than this W+1a a) depth by, for example, sputtering or vapor deposition, the surface is polished by 1JI by etching, etc., to the original V of the substrate 1, and the back core 2 is Form. Thereafter, a core layer 3 is formed by depositing a desired thickness of Ill(l+) film on the second part by, for example, sputtering. The corresponding one is 1b.

4 is a non-141 (11'IA) holder made of, for example, Relamic, and is bonded to the upper part of the core layer 3. 4a is a window provided in the holder 4 for winding. This window 4b is formed at a position corresponding to the notch 1b. 3a is a gap, which is formed of a thin film of a non-magnetic material such as S;02.

In this way, the back core 2 for reducing the magnetic resistance of the magnetic head Lt gap 3a of the present invention is buried in the substrate 1 behind the Lt gap 3a, thereby increasing the magnetic efficiency. .

Second part about the manufacturing method of the magnetic head of the present invention
This will be explained with reference to the process diagrams shown in FIGS.

In FIG. 2, reference numeral 5 denotes a substrate made of a non-magnetic material, for example ceramic, and this substrate 5 has a shape corresponding to the rear part of the magnetic head core excluding the vicinity of the gap, by etching or laser processing. A plurality of substantially concave grooves 5a are formed. In the same figure, groove 5a
Although the number is four, it is not limited to this.

Next, fill the upper part 5a of the substrate 5 with a magnetic material such as sendust by sputtering or vapor deposition to a depth equal to or greater than the depth of the groove 5a, and then polish the upper part to make the groove 5a magnetic. A backloar allo consisting of the body is formed (see Figure 3). Furthermore, a magnetic film of a desired thickness is deposited on the upper part of the substrate 5 by, for example, vapor deposition to form the core 7 (see FIG. 4). The thickness of this core, when completed as a magnetic head, is one magnetic rack width.

A plurality of substrates 5 having cores 7 attached thereon are laminated and bonded together using low melting point glass G1 to form a laminated block 8. At this time, the upper and lower FMs on each stacked board
5. The digits of a should be approximately the same (see Figure 5).
.

This block 8 is shown in FIG.
By cutting the magnetic head element vertically, a stacked body 9 of magnetic head elements is formed (see FIG. 6).

The laminate 9 is cut in the gap direction along c-c' in FIG. 6 to divide it into laminate halves 9a and 91). Then, one or both of the laminated halves 9a and 9b is provided with a full 104 wire for winding.
5 and in the vicinity of the back gap, adhesive notches 11 are formed, and rllIIg of the gap surface 12 is further formed. After a predetermined thickness of Si 02 or the like is deposited on the gap surface 12 by sputtering or the like, the laminated halves 9a and 9b are bonded to the lath G2 with a low melting point to be integrated. A laminate 13 is constructed (see FIG. 7).

The bonding is performed by filling and adhering the low melting point glass G2 to the rear of the notch 11 and the gap surface 12, so that the gap surface 12 is not covered with the low melting point glass G2. At this time, the working temperature of the low melting point glass G2 used is set to a softening temperature lower than the working temperature of the low melting point glass G1 used in FIG.

Next, the laminate 13 is assembled as shown in FIG.

By cutting along E-F', the magnetic head element piece 14 is
Take out. FIG. 8 is a partially sectional perspective view of this magnetic head element piece 14. The magnetic head element piece 14 is polished to a predetermined external size and shape, and a winding wire (not shown) is applied thereto to complete the magnetic head.

Although the present invention has been described using an example in which the grooves 58 are formed on one side of the substrate 5, the present invention is not limited to this, and the grooves 58 may be formed on both sides of the substrate 5.

(Effects of the Invention) According to the present invention, since the degree of freedom in combining materials is large and the number of structural parts is small, a highly efficient magnetic head that is excellent in mass productivity and cost can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a magnetic head according to the present invention, FIGS. 2 to 8 are process diagrams of a magnetic head according to the present invention, FIG. 9 is a perspective view of a conventional magnetic head, and FIG. 10 is the ninth
FIG. 2 is an exploded perspective view of the conventional magnetic head shown in FIG. 1... Board, 1a... Groove, 1b... Notch, 2...
- Back core, 3... Core layer, 3a... Gap surface, 4... Holder, 4a... Window. -〇 - i t 1 Figure 2 days f3 Leap-75 Note 7 q I¥1 z3 '1' IOpi]

Claims (1)

[Claims] A groove of a predetermined shape is formed in a substrate made of a non-magnetic material, and a back core is formed by filling this groove with a magnetic material.A core layer made of a magnetic material is deposited on the top of this back core, and then this A magnetic head characterized in that a holding body made of a non-magnetic material is laminated from above a core layer.