JPS60170008A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve greatly the reduction of output due to the running of a tape by providing the glass or ceramic having the wear resistance approximately equal to that of a main core so that the glass having a low melting point poured to both sides of a head gap is held between upper and lower side surfaces of a head core. CONSTITUTION:Main cores 12a and 12b are made of an amorphous material contaning mainly Co-Nb-Zr; while auxiliary cores 13a and 13b are made of a ferrite material of Mn-Zn and Nj-Zn. A gap 15 is formed by bonding both cores 12a and 12b via an SiO2 film. In this case, the lead borate glasses 16a and 16b having a low melting point are poured to both sides of the gap 15 for reinforcement of adhesion of both cores 12a and 12b when the gape 15 is formed. These glasses contain the lead oxide of >=85wt%. Thus it is not required to heat those glasses up to a high temperature during a head working process, and the head can be produced without crystallizing the amorphous material of cores 12a and 12b. A nonmagnetic film which encloses the cores 12a, 12b, 13a and 13b is made of the glass or ceramic having the wear resistance approximately equal to that of an alloy magnetic material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic head, and particularly to a magnetic head suitable for use in combination with a high coercive force medium.

[Background of invention]

A magnetic head constructed as shown in FIGS. 1 and 2 has been proposed as a magnetic head suitable for use in combination with a high coercive force recording medium.

That is, a magnetic path is constituted by a main core 1α, 1 made of a magnetic alloy film having a head gap 4, and auxiliary cores 2α, 2k made of ferrite bonded to both sides of the main core,
This magnetic head has a tape sliding surface of the main core formed in an X shape.

One of the features of such a magnetic head is that it can effectively magnetize a magnetic recording medium with a high coercive force at a short recording wavelength and enable wide-band magnetic recording.

However, when a magnetic head according to the present invention is applied to a VT), there is a problem in that the head output rapidly decreases as the running time of the magnetic tape elapses.

However, based on the X-shaped configuration of the king core la, the main core reinforcing glass is melted and poured into the recessed portion. This glass is a low-melting glass that does not crystallize the main core (for example, amorphous) during the head process, and is, for example, lead-borate glass (high lead-containing glass with a lead oxide content of 80% by weight or more). The head is formed using head processing technology commonly applied to current video heads, with main cores of 1tL and 1tL.
4 caps and auxiliary core 2α, 24 J, m
f each m''=, 200μm, m=25μ
m, and the ratio of these is about 1:8.

Therefore, the inventor of the present invention has investigated the head whose output has decreased in detail and has predicted the cause of the head output.The cause is as follows.

That is, as a result of tape running for a long time, the glasses 6α and 66 are significantly worn, and as shown in FIG.
a, 6k is greatly concave.

In a head having such a shape, serious defects in head performance occur for the following reasons.

In general, the arc at the head abutting portion 3 of the Qi-Two varies depending on the tape tension, tape rigidity, and the amount of tape bite of the head, and also varies depending on the head width m'. Therefore, in the head shown in Fig. 3, the gap 4 and the auxiliary core 2e are
Since the width of the tape sliding surface 3 differs between L and 24, the optimum tape arc also differs. Since the tape command 'cfrI3 of this head mainly corresponds to the auxiliary cores 2α and 24, the tape arc in the cab 4 is determined by the auxiliary cores 2a and 2A. Therefore, the tape arc in the cab 4 is not optimal, and tape spacing occurs in the cab 4, resulting in a decrease in head output.

Also, as shown in Fig. 3, when the glasses 5cL and 54 are depressed, the abutment tape is also depressed by the glasses 6cL and 54, and the main core l tL
, l 4 is also easily dented. Therefore, main cores 1α, 14
gradually begins to recess with respect to the auxiliary core, the spacing in the cab 4 increases, and in addition to the above reasons, a significant drop in head output occurs.

[Purpose of the invention]

An object of the present invention is to provide a head structure that is unlikely to cause a decrease in output in the table running system described above.

[Summary of the invention]

The scattering point of the present invention is made by inserting low melting point glass poured into both sides of the head cap on the upper and lower surfaces of the head core.
The main core is made of glass or ceramic that has the same level of wear resistance as the main core.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings. FIG. 4 is a perspective view showing one embodiment of the magnetic head of the present invention, and FIG. 5 shows the tape sliding surface thereof. In the figure, the magnetic head 10 has a total of 4. The main core 12α and 12A are made of a-type materials, and the auxiliary core 13 is made of ferrite.
a, 13J and main core 12L: L, 124 and auxiliary core 1
The non-magnetic films 14a and 1 are sandwiched between 3α and 134.
44 is arranged. King Core 12a, 124 HaCo
- It is amorphous mainly composed of Nb-Zr, and the ferrite in the auxiliary core 136.13 is Mn-Zn.

It is Nj-Zn ferrite. The cap 15 is formed by gluing the left and right main cores 12a, 12a together with a 5LO2 film interposed therebetween. Two main cores 1 with gap 15 shape a
2α, 12J adhesive reinforcement is low melting point lead borosilicate glass 16a, 16J on both sides of gap 150! Pour r.

As described above, the lead-bolus glass 16a, 164 uses high lead content glass containing 85% by weight or more of lead oxide, so there is no need to heat it to high temperatures during the head processing process.
The main core 12α can be made into a head without crystallizing the amorphous LSI. Main core 12α.

The non-magnetic film sandwiching the core 12 and the auxiliary cores 13α and 134 is made of glass or ceramic, which has the same wear resistance as the alloy magnetic material. According to the inventor's research, suitable glasses include lead glass containing 80 wt L% or less of lead oxide, and quartz bath-type crystallized glasses. As the ceramic, oxides such as Mn, N, 4, Zr, SL, MII, and TL are preferable. This non-magnetic II! ! 14a, 144
Although either physical vapor deposition or adhesion may be used, physical vapor deposition is preferable from the viewpoint of process reliability. In this case, the above-mentioned suitable materials are limited, but the present invention can be easily coupled. It is desirable that the thickness be as thick as possible, but it may be 10 microns or more.

In the tape contact in the magnetic head 10 of the present invention, due to the tape supporting effect of the non-magnetic films 14a and 144, the taper arcs of the auxiliary blades γ13a and 134, which are the main tape sliding surfaces, and the cap 15 are almost the same. , it becomes difficult to cause subbase sync between the tape heads at the gap 15.

〔Effect of the invention〕

According to the above-described magnetic head of the present invention, the significant difference in the tape arc between the gear part and the main tape sliding surface caused by the tape running is eliminated by the tape supporting effect of the nonmagnetic film, and the output by the tape running is reduced. The bottom can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional magnetic head, Fig. 2 is a front view showing the tape sliding surface of a magnetic head made by the manufacturer, and Fig. 3 is a perspective view of a conventional magnetic head.
A perspective view to explain the power of O;
5 is a perspective view of a magnetic head showing a practical example of the present invention, and FIG. 5 is a front view showing a tape sliding surface of the magnetic head of the invention. 11...Tape sliding surface 12...Main core 13...Auxiliary core 14...Non-magnetic film 15...Gap 16...Low melting point glass plate I Figure 2 Closed Figure 3

Claims (2)

[Claims] (1) The alloy magnetic material is used as the main core, the ferrite is used as the auxiliary core, and the main core is sandwiched between the auxiliary cores in the sliding direction of Q1, and the head gap arranged on the tape contacting surface of the king core is perpendicular to the tape sliding direction. What is claimed is: 1. A magnetic head in which low melting point glass is arranged to be sandwiched in a tape sliding direction, characterized in that the herad cab and low melting point glass are sandwiched by a non-magnetic material in a direction orthogonal to the tape sliding direction. (2) The non-magnetic material is low melting point glass containing 80% by weight or less of lead, crystallized glass, and M? L, N7. ZpS
L, Ml, Ti, all kinds of oxide ceramics -
The magnetic head according to claim 1, using type a.