JP2757526B2 - Magnetic disk - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk for recording and reproducing information.

FIG. 6 is a sectional perspective view of a conventional magnetic disk.
In FIG. 6, 1 is a magnetic sheet, 2 is a center hub,
Reference numeral 3 denotes a reference surface of the center van hub 2, reference numeral 4 denotes an engagement hole with a spindle motor for rotating the magnetic sheet 1, and reference numeral 5 denotes an adhesive layer. The vicinity of the center of the magnetic sheet 1 is fixed to the center hub 2 via an adhesive layer 5. On the other hand, since the outer edge of the magnetic sheet 1 is a free end, the magnetic sheet 1
In many cases, the recording surface of the magnetic sheet 1 is largely displaced with respect to a plane due to the unavoidable internal stress generated in the manufacturing process of FIG.

FIG. 8 shows an example of a conventional recording / reproducing apparatus using a magnetic disk.

6 is a magnetic head, 7 is a spindle motor, 8 is a feed screw, 9 is a stepping motor, and 10 is a sheet presser.
The magnetic head 6 can be moved to any position in the radial direction of the magnetic sheet 1 by driving the stepping motor 9 and rotating the feed screw 8. The sheet retainer 10 is provided in the vicinity of the magnetic head 6 to ensure close contact between the magnetic sheet 1 and the magnetic head 6 even if the magnetic sheet 1 is deformed as shown in FIG. To the magnetic head 6 side.

However, in the recording / reproducing apparatus using the magnetic disk having the above-described conventional configuration, the sheet retainer 10 is indispensable, and since the sheet retainer 10 contacts the magnetic sheet 1, the magnetic sheet 1 may be damaged. There is a problem that the sheet presser 10 is worn, the correction force for the magnetic sheet 1 is weakened, and the head touch is deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a novel magnetic disk that ensures good contact between a magnetic sheet and a magnetic head without providing a sheet press in a recording / reproducing apparatus. .

Means for Solving the Problems To achieve this object, the magnetic disk of the present invention
A magnetic sheet is fixed at least near the center of a hard disk having higher steel properties than the magnetic sheet, and a space is provided between the hard disk and the magnetic sheet.

The hard disk fixing the magnetic sheet corrects the bending deformation of the magnetic sheet, and even if the magnetic head is pressed against the magnetic sheet, the space escapes, preventing the magnetic sheet and the magnetic head from being damaged. You.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Note that the same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a sectional perspective view of a magnetic disk according to a first embodiment of the present invention. Numeral 11 denotes a metal disk, to which the magnetic sheet 1 is fixed in the vicinity of the center via an adhesive layer 5. Reference numeral 12 denotes a space provided between the magnetic sheet 1 and the metal disk 11, and reference numeral 13 denotes a regulating surface provided near the outer edge of the magnetic sheet 1 and almost at the same height as the reference surface 3. The bending deformation of the magnetic sheet 1 in the direction away from the metal disk 11 is allowed, but the bending in the direction approaching the metal disk 11 is restricted by the regulating surface 13.
Deterred by

FIG. 2 is a sectional view when the magnetic disk of the above embodiment is mounted on a recording / reproducing apparatus. The tip of the magnetic head 6 is positioned so as to enter the space 12. However, since the inner peripheral portion of the magnetic sheet 1 is fixed to the reference surface 3 and the outer peripheral portion is supported by the regulating surface 13, the magnetic sheet 1 is bent in a mountain shape as shown in FIG. As a result, the magnetic sheet 1
Is pressed against the magnetic head 6 by the action of its own elastic restoring force. Thus, by using the magnetic disk of the present invention,
Even if the recording / reproducing apparatus does not have the sheet retainer 10 as shown in FIG. 8, close contact between the magnetic sheet 1 and the magnetic head 6 can be obtained.

Further, since the metal disk 11 rotates integrally with the magnetic sheet 1, there is no danger that the regulating surface 13 will be worn or the magnetic sheet 1 will be damaged by the regulating surface 13.

FIG. 3 is a sectional view of a magnetic disk according to a second embodiment of the present invention. In the magnetic disk according to the first embodiment, the reference surface 3, the engagement hole 4, the space portion 12, and the regulating surface 13 are integrally formed of the same metal body, but as shown in FIG. , The disk member 15 and the protruding member 16 do not hinder the object of the present invention.
Therefore, an optimum combination of members can be selected according to the purpose of use of the magnetic disk, the environment, and the like.

FIG. 4 is a sectional view of a magnetic disk according to a third embodiment of the present invention. Since the magnetic sheet 1, the reference surface 3, the space 12, and the regulating surface 13 are arranged on both sides of the metal disk 11, the recording capacity of one magnetic disk can be doubled as in the first embodiment. is there.

FIG. 5 is a sectional view of a magnetic disk according to a fourth embodiment of the present invention. The space portion 12 is opened in the outer circumferential direction of the magnetic sheet 1, and unlike the other embodiments shown in FIGS. 1, 3 and 4, the regulating surface 13 does not protrude from the metal disk 11. Therefore, although the ability to correct the bending deformation of the magnetic sheet 1 is low, the tolerance for the pushing of the magnetic head 6 becomes large, so that the positioning accuracy of the magnetic head 6 can be roughened.

Effect of the Invention As described above, the magnetic disk of the present invention is characterized in that a magnetic sheet is fixed to a hard disk near the center thereof and a space is provided between the hard disk and the magnetic sheet, whereby the magnetic sheet and the magnetic head are provided. Close contact with the magnetic sheet can be guaranteed semi-permanently, and the magnetic sheet is not damaged.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a magnetic disk according to a first embodiment of the present invention, FIG. 2 is a sectional view when the magnetic disk of the embodiment is mounted on a recording / reproducing apparatus, and FIG. 2
FIG. 4 is a sectional view of a magnetic disk according to the third embodiment of the present invention, and FIG.
FIG. 6 is a sectional view of a magnetic disk according to a fourth embodiment of the present invention, FIG. 6 is a sectional perspective view of a conventional magnetic disk, and FIG. 7 is a sectional perspective view for explaining bending deformation of the conventional magnetic disk. FIG. 8 is a cross-sectional view when the conventional magnetic disk is mounted on a recording / reproducing apparatus. 1 ... magnetic sheet, 3 ... reference surface, 5 ... adhesion surface, 6 ...
... Magnetic head, 10 ... Sheet holder, 11 ... Metal disk, 12
…… space, 13 …… regulatory side.

Claims (1)

(57) [Claims] 1. A hard disk comprising: a magnetic sheet; and a hard disk having a higher steel property than at least the magnetic sheet. Only a center portion of the magnetic sheet is fixed to a center portion of the hard disk. A magnetic disk characterized by having a space between them.