JPH0520829A - Disk medium - Google Patents

Abstract

PURPOSE:To put dust particles into a groove in an assembly operation and to restrain them from being scattered to the face of a disk by a method wherein the concentrically cylindrical hollow groove which comes into contact with a spindle hub is formed in the clamp part of the disk. CONSTITUTION:Concentrically cylindrical hollow groove parts 24 which come into contact with a spindle hub 1 are formed at the inside of a cylindrical clamp part 22 which comes into contact with the spindle hub 1. When the outer circumferential end of a magnetic disk part 21 is held and inserted into the spindle hub 1 in an assembly operation, it comes into contact with a central circular hole edge 23 more or less. Since dust particles produced at this time enter the groove parts 24, they adhere to fin parts 25, and it is possible to prevent them from being scattered to a disk face. As a result, it is reduced that the dust particles which are hard to remove adhere to the surface of a magnetic layer 4 on a magnetic disk medium, and it is possible to restrain the magnetic layer 4 from being damaged when the layer collides with a magnetic head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a disk medium used in a disk device.

[0002]

2. Description of the Related Art FIG. 3 is a sectional side view showing a state in which conventional magnetic disk media are stacked. In this figure, 1
Is a spindle hub, 2 is a magnetic disk medium mounted on the spindle hub 1, and 3 is a spacer for stacking the magnetic disk media. Reference numeral 4 is a magnetic layer for recording information, and 5 is a magnetic head for recording.

Next, the assembly of the apparatus will be described. When assembling the magnetic disk device, the central circular hole of the magnetic disk medium 2 is inserted into the spindle hub 1, the spacer 3 is further inserted thereover, and the magnetic disk media 2 are stacked in a number that meets the device specifications. During operation, the disk device rotates the magnetic disk medium 2 at a high speed so that the magnetic head 5 floats above the magnetic layer 4 with a minute gap between them to record / reproduce information.

[0004]

Since the conventional magnetic disk medium 2 is assembled as described above, when the magnetic disk medium 2 and the spacer 3 are inserted into the spindle hub 1,
Dust generated by the contact between the magnetic disk medium 2 and the spacer 3 and the spindle hub 1 adheres to itself or another magnetic disk medium to be stacked and is difficult to remove easily. Therefore, there is a problem that the dust collides with the magnetic head 5 during operation and damages the magnetic layer 4.

The present invention has been made in order to solve the above problems, and an object thereof is to reduce the adhesion of dust generated by contact with the spindle hub 1 to the magnetic layer 4.

[0006]

DISCLOSURE OF THE INVENTION A disk medium according to the present invention has a concentric cylindrical hollow groove in contact with a spindle hub inside a cylindrical central portion corresponding to a clamp which contacts a spindle hub. Provided.

[0007]

The disk medium according to the present invention has an effect that dust generated when the disk medium is inserted into the spindle hub is housed in a concentric cylindrical hollow groove to reduce scattering of the dust on the recording / reproducing surface of the disk medium. There is.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of one disc. In FIG. 1, reference numeral 21 is a magnetic disk portion, 22 is a spacer portion which plays a role of a spacer 3 integrally formed with the magnetic disk portion 21, 23 is a central circular hole end surface, 24 is a groove portion, 2
5 has a diameter slightly larger than the end face 23 of the central circular hole,
It is a fin portion for making the groove portion 24 so as not to come into contact with the spindle hub 1. In other words, the concentric cylindrical hollow groove is formed in contact with the spindle hub 1.

When a person or a robot holds the outer peripheral end of the magnetic disk portion 21 and inserts it into the spindle hub 1, the end face 23 of the central circular hole varies to some extent.
To contact. The dust generated at that time is scattered around, but enters the groove portion 24 formed in the vicinity and adheres to the fin portion 25, and the scattering is suppressed. Therefore, adhesion to the surface of the magnetic layer 5 of the magnetic disk medium 2 is reduced,
It is possible to prevent the magnetic layer 5 from being damaged due to the collision with the magnetic head 6.

Embodiment 2. In the above embodiment, the clamp portion contacting the spindle hub is the spacer portion integrally formed with the spacer. However, as shown by the dotted line in FIG. 2, the central circle is slightly rounded so as not to contact the spindle hub. It is also possible to separately prepare a large spacer and assemble the spacer and the disk portion. The same effect can be obtained by inserting the disc into the spindle hub after assembling the disc.

Embodiment 3. In the above embodiment, the spindle
The number of concentric cylindrical grooves that contact the hub is the same as the center circular hole end surface 2
Although a plurality is provided above and below 4, the number may be one above and one below.

Embodiment 3. In the above embodiment, the spindle
The concentric cylindrical groove that is in contact with the hub is merely hollow, but it may have a structure in which an electrically insulating resin or the like is partially embedded in the groove. With such a structure, the charged dust is more strongly drawn into the groove portion, so that the scattering of dust is further suppressed.

Embodiment 4. In the above-mentioned embodiment, the example applied to the magnetic disk medium has been shown, but the present invention can be applied to any medium such as magneto-optical disk, which causes a problem of dust scattering and adhesion to the recording and reproducing surfaces.

[0014]

As described above, according to the present invention, since the concentric cylindrical hollow groove is provided in contact with the spindle hub in the clamp portion of the disk medium in contact with the spindle hub, it is possible to connect the spindle hub to the spindle hub. This has the effect of suppressing the scattering of dust around when the disc medium is inserted and assembled.

[Brief description of drawings]

FIG. 1 is a sectional view of a magnetic disk medium according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a portion in contact with the spindle hub of FIG.

FIG. 3 is a cross-sectional view showing a state in which conventional magnetic disk media are stacked and assembled.

[Explanation of symbols]

 1 Spindle Hub 22 Clamping Part 23 Center Circular Hole End Face 24 Concentric Cylindrical Hollow Groove

Claims (1)

Claim: What is claimed is: 1. A disk medium having a concentric cylindrical hollow groove in contact with the spindle hub inside a portion corresponding to the cylindrical clamp that contacts the spindle hub.