JPH0467310A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain output corresponding to a film thickness for a prescribed track width by obliquely forming soft magnetic thin films in the gap direction and forming a part forming the track width with an angle larger than the other part for a gap. CONSTITUTION:A head chip 10 having high saturated magnetic flux density is formed in such a way that grooves 5 having groove wall surfaces whose upper part is at an acute angle compared to a lower part for the bottom of a substrate 1 by a prescribed pitch method are continuously formed on the surface of the substrate 1. The soft magnetic thin films 2 in a prescribed film thickness are formed by a vacuum evaporation or sputter method on one groove surface of respective grooves 5. Thus, the soft magnetic thin films 2 are obliquely formed for the gap 12 and the part forming the track width is formed with the angle larger than the other part for the gap 12. Thus, output corresponding to the film thickness for the track width can be obtained.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a magnetic recording/reproducing device such as a video tape recorder, which comprises a soft magnetic thin film forming a magnetic circuit and a substrate supporting the soft magnetic thin film. This relates to magnetic heads.

(Prior art) With the increasing density of magnetic recording technology, high coercive force media such as metal tapes have become mainstream, and now the core materials used in magnetic fields have a high saturation magnetic flux density. requested.

Under these circumstances, the magnetic head is equipped with a head chip plate having a soft magnetic thin film 22 made of a soft magnetic metal having a high saturation magnetic density and a substrate 21 supporting the soft magnetic thin film 22, as shown in FIG. 25 is used.

The magnetic head using this Hefdotyfde 25 is resistant to uneven wear when the magnetic head is slid on the tape because the soft magnetic thin @22 is formed diagonally with respect to the gap 2B.
Further, when an oxide magnetic material (for example, ferrite) is used for the substrate 21 that supports the soft magnetic thin film 22, the boundary between the oxide magnetic material and the soft magnetic thin film 22 is parallel to the gap 28. It is also possible to avoid the problem that the magnetic properties become discontinuous on both sides of the boundary, which acts as a pseudo gap and adversely affects the performance of the magnetic field.

(Problem to be Solved by the Invention) However, in this magnetic head, if the inclination angle of the soft magnetic thin film with respect to the gap is θ, the track width Tw is a dimension obtained by dividing the film thickness t K sin θ of the soft magnetic thin film 22. becomes. Figure 8 is related to Twit.

For example, when t-10μ11θ-45″, Tw-14,
This will be the 1μ corridor.

Conversely, when Tw=10*m θ==45°, t-7μ
■It is necessary to do so.

Generally, the head output increases as the film thickness t increases, but in the case of this magnetic head, in order to obtain a certain track width Tw, it is necessary to set a smaller film thickness t, which is disadvantageous in terms of output. There are problems.

(Means for Solving the Problems) In order to solve the above problems, the magnetic head of the present invention has the following features:
In a magnetic field consisting of a substrate that supports a soft magnetic thin film constituting a magnetic circuit, the soft magnetic thin film is formed diagonally with respect to the gap, and the portion where the track width is formed is narrower than other portions. It is characterized by being formed at a larger angle to the gap.

(Function) According to the above structure, the inclination angle θ of the soft magnetic thin film with respect to the gap is larger than that of the other parts in the part forming the track width. ,
It is possible to obtain an output commensurate with the film thickness t. →tI11
Refer to FIG. 8 (Example) An embodiment of the present invention will be described based on FIGS. 1 to 7.

The magnetic head according to the present invention uses a head chip 10 having a high saturation magnetic flux density, as shown in FIG.

This head chip 1O has a pair of substrates 1 made of a non-magnetic material such as photosensitive crystallized glass, crystallized glass, or ceramics, or an oxide magnetic material such as soft magnetic ferrite. First, as shown in FIG. 2, the surface of the substrate 1 made of the above-mentioned non-magnetic material or oxide magnetic material is placed on the surface of the substrate 1 (2) with a predetermined pitch dimension A as shown in the figure. A groove 6 having an acute groove wall surface
are formed continuously. Subsequently, as shown in FIG. 8, a soft magnetic thin film 2 made of an Fe-AJ-3i alloy is formed on one wall surface of each of the grooves 6 to a predetermined thickness by vacuum evaporation or a swab-filling method. do.

Next, as shown in FIG. 4, after filling the groove 5' with low melting point glass 8, as shown in FIG. Polish to a flat surface.

Next, as shown in FIG. 6, an internal winding groove 6 and an external winding groove 7 are formed on both sides of the substrate 10, and the gap surface 8, which is the side on which the glass filling groove 5 is formed, is then formed. A non-magnetic gap material such as 5iO1 (not shown) is formed by vacuum evaporation or a suvafuta method so as to form a predetermined gap, thereby forming the substrate block 11. Thereafter, as shown in FIG. 7, the gear surfaces 8 of the pair of substrate blocks 11 are aligned so as to face each other, and the core blocks 9 are joined by applying pressure and fixation. Next, the core block 9 is cut along the broken line at a predetermined pitch dimension B to form the head chip 10 shown in FIG. After this head chip 10 is adhesively fixed to a base plate (not shown), coil winding and tape polishing are performed to form a magnetic head. As a result, in the magnetic head, the soft magnetic thin film 2 is formed obliquely to the gap 12, and the portion forming the track width is formed at a larger angle to the gap than other portions.

(Effects of the Invention) As described above, the soft magnetic thin film is formed obliquely to the gap direction, and the portion forming one track width is formed at a larger angle to the gap than other portions. Therefore, the difference between the track width and the thickness of the soft magnetic thin film becomes small. It is possible to obtain output commensurate with the film thickness for a specified track width.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts showing an embodiment of the head chip of the magnetic head of the present invention, FIGS. 2 to 7 are explanatory views of the formation of the groove 1 shown in FIG. No. 981 is a perspective view of a main part showing an embodiment of a conventional magnetic head. In the drawings, 1 is a substrate, 2 is a soft magnetic thin film, 8 is a low melting point glass, 5 is a groove, and 2 is a gap.

Claims (1)

[Claims] 1. In a magnetic head consisting of a soft magnetic thin film constituting a magnetic circuit and a substrate supporting the soft magnetic thin film, the soft magnetic thin film is formed obliquely to the gap direction, and the portion forming the track width is , a magnetic head characterized by being formed at a larger angle with respect to the gap than other parts.