JPS60191431A - Compound magnetic recording medium - Google Patents

Abstract

PURPOSE:To allow the compound magnetic recording medium to contact a head excellently by fixing at least part of a disk which has magnetic alloy formed on a flexible base to a body which is not flexible. CONSTITUTION:The flexible base is fixed to the body which is not flexible after deformation such as ''curvature'' is corrected. The outer peripherl edge of the base is fixed to a metallic ring made of aluminum or stainless steel as a practical fixing method. Namely, the recording medium is sandwiched in a slight clearance between rings 2 and 3 and the ring 3 is pressed in the ring 2 and fixed. The gap of the slight clearance is selected properly to press, insert, and fix the base at a time, and a curved medium is spread flatly. Consequently, variation in recording and reproduction output due to the curvature of the medium is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording medium for a floppy disk device, and particularly to a structure of a magnetic recording medium suitable for high-density recording.

[Background of the invention]

Conventionally, recording media for floppy disk drives have been manufactured by coating fine ferromagnetic powder particles mixed with a binder onto a substrate, so-called coating-type recording media have been used, but Since the magnetic powder is diluted with a binder (1), it has the disadvantage that high recording density cannot be achieved.

In contrast, thin-film recording media have recently been developed in which a ferromagnetic alloy layer is deposited on a substrate by plating, vapor deposition, sputtering, etc., and in principle they can achieve high recording densities. This is attracting attention as it is achievable. However, on organic resins such as polyester and polyimide, which are commonly used as flexible substrates, Co, Co--Ni alloys, etc. are used as media for recording and reproducing.
When an alloy layer such as a Go-Cr alloy or a Ni-Fe alloy is deposited, the internal stress of the alloy layer caused by differences in thermal expansion coefficients can cause warpage or other problems to occur on a flexible substrate to a greater or lesser extent. Gives transformation. Since it is necessary to maintain good contact between the head and the medium in order to achieve high recording density, such deformation such as "warpage" is undesirable.

[Purpose of the invention]

An object of the present invention is (2) to provide a thin film type recording medium for a floppy disk device that can maintain good contact with the head and achieve high recording density.

[Summary of the invention]

In the present invention, a flexible substrate is fixed to a non-flexible object while correcting deformations such as "curvature". Practical fixing methods include fixing the outer peripheral edge of the base to a metal ring made of aluminum, stainless steel, or the like.

[Embodiments of the invention]

FIG. 1 shows a cross-sectional view of the composite magnetic recording medium according to this example (
) and a plan view (b) are shown. Reference numeral 1 is a recording medium for a disk drive, in which a Go--Cr perpendicular magnetization medium is formed on both sides of a flexible substrate by a vapor method. 2 and 3 are two rings made of aluminum, and the rings 2 and 3 are
The recording medium 1 is sandwiched between the rings 2 and 3, and the ring 3 is pushed into the ring 2 and fixed. By appropriately selecting the spacing between these gaps, it is possible to apply tension to the substrate and simultaneously fix it, thereby making it possible to straighten a warped medium. As a result, fluctuations in recording/reproduction output due to warpage of the medium can be reduced (3). The fluctuation rate of the envelope has decreased from 80% before improvement to 1
0% or less, and it is possible to improve recording density and reliability.

In practice, care must be taken to avoid damaging the alloy medium, such as adding curvature to the part where the alloy contacts the ring.

Also, in practice, fixings for the presser foot of various shapes are possible. However, in order to use a recording medium alloy formed on both sides, it is most practical to fix the outer edge of the flexible base.

〔Effect of the invention〕

According to the present invention, it is possible to realize a thin film type medium for use in a disk drive that is free from deformation such as warping, and therefore a high recording density can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view (a) and a plan view (b) of a composite magnetic recording medium according to an embodiment of the present invention.

Claims (1)

[Claims] 1. A composite magnetic recording medium in which at least a portion of a disk in which a magnetic alloy is formed on a flexible base is fixed to a non-flexible object. 2. The composite magnetic recording medium according to claim 1, wherein at least a large portion of the outer peripheral edge of the flexible substrate is fixed.