JPH0317877A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To prevent the change of tension or that of thickness due to temperature or humidity occurring by providing a flat spring so as to sandwich a magnetic plate with a pressing hub, and providing a rib at a presser hub position almost confronting with the flat spring via the magnetic plate. CONSTITUTION:A flexible magnetic plate 1 is stuck on a substrate 2 along the rib at an outer periphery. The flat spring 3 is mounted on the center hub of the substrate 2 with a flat spring presser 4. The flat spring 3 is connected elastically to the magnetic plate 1 from a lower side, and supplies the tension by pressing the magnetic plate 1 outward. Meanwhile, the presser hub 5 is provided fixedly on the center hub at the upper plane side of the magnetic plate 1 with a screw 6, and the presser hub 5 and the flat spring 3 sandwiches the center part of the magnetic plate 1. Also, the rib 10 at the outer peripheral part of the presser hub 5 is formed at the position almost confronting with the outer peripheral part of the flat spring 3, and the thickness (h) of the magnetic plate 1 is regulated so as to be kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording medium, and more particularly to an improvement of a support for a flexible disk (flexible magnetic plate).

[Conventional technology]

Conventionally, in this type of device, there is one that provides tension to the disk by creating a gap between the substrate and the disk and injecting air into the gap, and one that applies tension to the disk by creating a gap between the substrate and the disk.
As in No. 8, a method has been proposed that uses an acrylic polymer adhesive method and applies ion irradiation while applying tension to the disk to cure the disk.

[Problem to be solved by the invention]

However, if there is a temperature change, the flexible disk may expand or contract, or the substrate may expand or contract.
Flexible discs may sag or wrinkle.

Also, even with the method of injecting air, it expands even if the tension is constant. Since the thickness changes due to shrinkage, there is a drawback that the head touch changes.

The object of the present invention is to solve the problems of the conventional products, such as changes in tension and thickness due to temperature and humidity, and to provide a magnetic recording medium with excellent head touch.

[Means to solve the problem]

The above object is a recording medium in which a flexible magnetic plate is pasted on a substrate and a presser hub is provided in the center, a temporary spring is provided to sandwich the magnetic plate between the presser hub, and on the other hand,
This is achieved by providing a rib at the holding hub position that substantially faces the temporary spring with a magnetic plate interposed therebetween.

[Effect]

In the present invention, in order to keep the tension of the flexible disk constant, a temporary spring is provided on the central hub and pressed. Further, a presser is provided on the surface facing the spring so that the thickness of the recording surface is always constant. As a result, even if the flexible disk expands or contracts due to changes in temperature and humidity, it is relaxed by the elastic force of the leaf spring, so that it always maintains a constant tension.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a magnetic recording medium according to the present invention, and FIG. 2 is a perspective view of a temporary spring.

A flexible magnetic plate 1 is attached to the substrate 2 along the ribs on the outer periphery. A leaf spring 3 is attached to the central hub of the board 2 by a leaf spring retainer 4. The leaf spring 3 comes into elastic contact with the magnetic plate 1 from below, and presses the magnetic plate 1 outward to apply tension.

On the other hand, a presser hub 5 is fixed to the center hub on the upper surface side of the magnetic plate 1 with a screw 6, and the center portion of the magnetic plate 1 is held between the presser hub 5 and the temporary spring 3. Further, the rib 10 on the outer periphery of the presser hub 5 and the outer periphery of the leaf spring 3 are formed at substantially opposing positions, and the thickness h of the magnetic plate 1 is regulated to be constant.

For example, as shown in FIG. 2, the plate spring 3 has a screw through hole 7.
It is composed of a disk-shaped spring substrate 8 provided with a disk-shaped spring substrate 8, and spring pieces 9 radially provided at equal intervals around the disk-shaped spring substrate 8.

Note that this temporary spring 3 is manufactured by a process such as press punching.

〔Effect of the invention〕

As explained above, according to the present invention, the temporary spring allows
Since tension is applied to the magnetic plate, the temperature and
It is possible to eliminate the problems of tension changes and thickness changes due to humidity.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a magnetic recording medium according to the present invention, and FIG. 2 is a perspective view of a leaf spring. 1... Magnetic plate, 2... Substrate, 3... Leaf spring, 5...
...Holding hub, 10...rib. ! Figure I Figure 2 Figure 3

Claims (1)

[Claims] In a recording medium in which a flexible magnetic plate is pasted on a substrate and a presser hub is provided in the center, a leaf spring is provided to sandwich the magnetic plate with the presser hub. A magnetic recording medium characterized in that a rib is provided at a holding hub position substantially facing a leaf spring.