JPS60261032A - Magnetic disc medium - Google Patents

Abstract

PURPOSE:To attain stable head running by arranging a soft magnetic substance in a slot of a recording medium supporting member to which an annular slot is formed and allowing the magnetic recording medium to be supported to the recording medium supporting member so as to cover the opening of the slot thereby making the disc face flat. CONSTITUTION:The magnetic recording medium 10 is formed by forming a magnetic film 12 on a plastic film 11 and the medium 10 is supported while a circular recording medium support made of a nonmagnetic rigid body is impressed with a tension. The annular slot 14 is formed to the lower part of the magnetic recording medium 10 of the supporting member 13, the annular soft magnetic substance 15 is imbedded in the slot 14 to a degree not to be in contact with the recording medium 10 and a gap of nearly 100mu is provided between the magnetic recording medium 10 and the soft magnetic substance 15. A tension is impressed radially to the magnetic recording medium 10, resulting that even mechanical uneveness such as folds or curls are corrected, a smooth face is realized and a stable reproduced output is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic disk medium used in a magnetic disk device applying perpendicular magnetic recording.

Conventional Structure and Problems Therein FIG. 1 shows a conventional magnetic disk device used for vertical path type magnetic recording. The configuration of the conventional example will be explained below with reference to FIG. In FIG. 1, reference numeral 1 denotes a circular base with a hole formed in the center, and this base 1 is made of a flexible plastic film. The magnetic layer 2 usually has a thickness of 1 μm or less, and is similar to the base 1 described above.
formed on top. The magnetic head consists of a main magnetic pole part 4 that is constructed around a soft magnetic thin film 3 that functions as a magnetic flux sensing element, and an auxiliary magnetic pole part 5 that faces the main magnetic pole part 4 with a medium in between. The windings 6, 6' are provided on either the main magnetic pole part 4 or the auxiliary magnetic pole part 5, or both.

Next, the operation of the above conventional example will be explained. In FIG. 1, 5 information is stored in the magnetic layer 2, and the soft magnetic thin film 3 in the main pole part 4 slides into contact with the magnetic layer 2 to detect this information. At this time, in order to ensure read efficiency and resolution of the head, the gap (spacing) between the magnetic layer 2 and the soft magnetic thin film 3 is always required to be minute.

However, in the conventional example described above, the spacing tends to vary depending on the mechanical properties of the magnetic disk, and as a result, the reproduction voltage tends to fluctuate.

This can be alleviated by firmly pressing the magnetic disk medium onto the main pole, but in this case there is a drawback that the surface of the magnetic disk is easily scratched. Furthermore, since the function is performed by a combination of a main magnetic pole and an auxiliary magnetic pole, there is a drawback that the structure of the double-sided head becomes extremely complicated.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the conventional examples described above, and aims to provide a magnetic disk medium that can run stably relative to a head.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for disposing a soft magnetic material in the groove of a recording medium support member in which an annular groove is formed.
The present invention is characterized in that the magnetic recording medium is supported by a recording medium support member so as to cover the opening of the groove.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, reference numeral 10 denotes an annular magnetic recording medium, and as shown in FIG. 3, this magnetic recording medium 10 is formed by forming a magnetic film 12 on a flexible plastic film 11. The magnetic recording medium IO is supported under tension by a circular recording medium support member 13 made of a non-magnetic rigid body. An annular groove 14 is formed in the lower part of the magnetic recording medium 10 of the recording medium support member 13, and this groove 1
An annular soft magnetic material 15 is embedded within the recording medium 4 to such an extent that it does not contact the recording medium 10 . Magnetic recording medium 10 and soft magnetic material 15
It is desirable that the gap between the two and 16 is a hole formed in the center of the recording medium support member 13.

Next, the operation of the above embodiment will be explained.

In FIG. 2, as a result of applying tension to the magnetic recording medium 10 in the radial direction, mechanical non-uniformities such as wrinkles and curls are corrected and a smooth surface is realized. Therefore, vertical movement of the disk surface due to rotation is absorbed, making it possible to obtain stable reproduction output. In order to improve the recording and reproducing efficiency of a perpendicular recording head, it is desirable to arrange a main magnetic pole and an auxiliary magnetic pole with the medium in between. In particular, the auxiliary magnetic pole may be composed only of soft magnetic blocks, and the winding may be provided within the main magnetic pole. The soft magnetic body 15 in this embodiment has the same function as the soft magnetic block serving as the auxiliary magnetic pole 5 in FIG.

Therefore, the selection of the soft magnetic material is loosely restricted, and ferrite, metal, or a material in which soft magnetic powder is dispersed in plastic can be used.

Therefore, by using the magnetic disk medium of this embodiment, it is possible to obtain the same recording and reproducing efficiency as a conventional head consisting of a main magnetic pole part and an auxiliary magnetic pole part by using only the main magnetic pole part as a head.

In addition, in the magnetic disk medium of this example, even if foreign matter enters between the head and the magnetic layer, the magnetic layer and the base film that is the substrate of the magnetic layer have flexibility, so the magnetic It is possible to escape layer damage and head crush.

Although FIGS. 2 and 3 showing this embodiment show an example in which the disk medium has magnetic layers on both sides, it is also applicable to a single-sided type, and the same effect can be obtained.

Effects of the Invention The present invention achieves the following effects with the above-described configuration.

(a) Since the flatness of the magnetic disk surface can be ensured, stable head running can be realized.

(b) It has the function of an auxiliary magnetic pole in the disk medium, and by using only the main magnetic pole part in the head, it is possible to achieve the same recording and reproducing efficiency as a conventional head with an auxiliary magnetic pole.

(C) The magnetic layer of the disk has the same structure as that of a conventional flexible magnetic disk, so it can achieve high productivity equivalent to that of a flexible magnetic disk and can be supplied at low cost. At this time, the magnetic layer only needs to be formed on either side of the base film, so it is easy to manufacture.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional perpendicular recording head and magnetic disk medium, FIG. 2 is a sectional view of a magnetic disk medium according to an embodiment of the present invention, and FIG. 3 is an enlarged view of part A in FIG. It is a diagram. DESCRIPTION OF SYMBOLS 10... Magnetic recording medium, 11... Plastic film, 12... Magnetic layer, 13... Recording medium support member,
14... Groove, 15... Soft magnetic material, 16... Hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A recording medium support member made of a disc-shaped non-magnetic rigid body having an annular groove, a soft magnetic body disposed in the groove, and a flexible film on which a magnetic layer is formed, and an opening in the groove. a magnetic recording medium supported by the recording medium support member so as to cover the entire surface of the magnetic disk medium, and a gap is provided between the magnetic recording medium and the soft magnetic material.