JPH0917037A - Disk and sheet member - Google Patents

Abstract

PURPOSE: To obtain an optical disk which is lowered in attraction force by static electricity and a sheet member by constituting protrusions on the surface of a disk to prevent the contact of the disk with a member facing the disk at a wide area. CONSTITUTION: The peripheral part of the central hole 2 of the optical disk 1 is provided with 6 to 20 pieces of the protrusions 1a having hemispherical roundness and is provided with the protrusions 1b which have semicylindrical roundness and are stretched in a radial direction at intervals of about 10 to 30mm in the outer peripheral part. The disk is provided with the protrusions 1a and/or 1b within the range of the height thereof of about 5 to 20μm although the height varies with the smooth state of the recording surface and the display surface of programs, etc. The length in the radial direction of the disk 1 of the protrusion 1b is made low toward the center at the height at which printing is possible on the program display surface. Since the thickness of the ink layer formed by silk printing is about 10μm, the height of the protrusions 1a, 1b is so determined that the protrusions 1a, 1b appear on the surface even after printing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to preventing adhesion between smooth surfaces of an optically recorded disk or the like for recording or reproduction.

[0002]

2. Description of the Related Art Optically recorded discs such as CDs have one side as a recording side and the front and back sides of the disc are smooth.
The surface is particularly smooth, and the other surface is also smooth although the song title and the like are displayed by silk printing or the like.

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention Static electricity is generated on the surface of a smooth disc, and it is difficult for the discs to be adsorbed and separated from each other, especially when the air is dried and stored for a long time. The song name, etc. is displayed, and the printing paint applied on a wide surface may be attracted to the smooth surface of other discs due to static electricity with a strong suction force and deteriorate. If left unattended for a while, the disk adheres to the wall surface of the storage device supported in the stored state due to static electricity caused by high-speed rotation, etc., and moves to the playback device when a disc is selected and played. There is a drawback that the state becomes so strong that it cannot be absorbed, resulting in malfunction.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a disc on which a signal is optically recorded or reproduced, the disc having projections on at least one surface. Further, the present invention is a disc on which a signal is optically recorded or reproduced, in which a sheet member having a projection is attached on one surface. Further, the present invention is a sheet member having a protrusion provided with a gap for preventing adhesion when the sheet member is attached to a disc and placed on another disc, and a central hole for centering the center when attaching. Further, the present invention is a sheet member which is light-transmissive and has a protrusion so that the display content of the attaching surface of the disc can be read when the sheet member is attached to the disc. Further, the present invention is a disc on which a signal is optically recorded or reproduced, and a protrusion is printed on at least one surface of the disc to prevent the disc from adhering to the other disc. Further, according to the present invention, in a disc on which a signal is optically recorded or reproduced, at least about 5 to 2 are provided at least in the peripheral portion of the central hole and the peripheral portion of one surface of the disc.
It is a disk having protrusions of about 0 μm.

[0005]

According to the present invention, since the projection is provided, even if the disk is attracted to the contact surface for a long period of time or by high-voltage static electricity, the contact area is made small by the air gap, so that the force required for separation can be made small. it can.

[0006]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a disk showing an embodiment of the present invention.
Six to twenty hemispherical rounded protrusions 1a are provided around the central hole 2 of the disk 1, and semicylindrical rounded protrusions 1b are extended in the radial direction on the outer peripheral portion. About 10
It is provided at intervals of mm to 30 mm. The height of the protrusions 1a and / or 1b varies depending on the smoothness of the recording surface and the display surface such as a curve, but is set in the range of about 5 to 20 μm.

The length of the protrusion 1b in the radial direction of the disk 1 is lowered toward the center so that it can be printed on the curved surface. The thickness of the silk printing ink layer is about 10
Since the thickness is about μm, the height of the protrusion is determined so that the protrusion appears on the surface even after printing.

As shown in FIG. 2, when the disks 1 and 1'of the present invention are stacked, a part of the printing surface or the projections 1a, 1 '
b comes into contact with another disc 1 ', so discs 1 and 1'
The electrostatic force generated between them causes an attractive force, but the contact area is reduced and the force required for separation is weakened. Although not shown, the protrusions 1a and 1b are formed on the surface of the disk by printing, and the ink is conductive so that the protrusion area is small and the protrusion is formed.

Further, even if the ink printed on the protrusion 1b is chemically changed by a tar of a cigarette for a long period of time and the discs are held in an adhered state, the adhesive force in a small area of the protrusion 1b. And a few μm on the surface of the disk 1.
Since the void is formed, the attraction force due to static electricity of a voltage of several KV and the vacuum state due to the smooth surfaces can be prevented, and the disk 1 can be easily detached and taken out.

Another embodiment according to the present invention will be described. FIG. 3 is a perspective view showing a state in which the sheet member according to the present invention is attached to a disc. The sheet member 3 according to the present invention is transparent and is formed so as to be optically readable when attached to a signal surface recorded on the disc 1 or a surface on which recorded contents such as music are displayed. The semi-cylindrical protrusions 3a are arranged in the radial direction at intervals of 10 to 30 mm and the height is 10 to 3
About 0 μm, it is configured to linearly contact the contact surface.

A hole 4 corresponding to the center hole 2 of the disc 1 is opened in the sheet member 3 with a diameter substantially larger than that of the center hole 2, and the outer peripheral portion also has an outer diameter so as not to protrude from the outer periphery of the disc 1. Formed small.

The sheet member 3 is attached to the disc 1 so that the center hole 4 of the sheet member 3 is concentrically aligned with the center hole 2 of the disc 1 as a target. The sheet member 3 is formed by mixing members having conductivity, or is coated with a conductive member. Therefore, even if the disc 1 comes into contact with a reproducing device or is rubbed at a high speed and electric charges are accumulated in the disc 1, the electric charges are accumulated when the sheet member comes into contact with the disc accommodating device, so that the electric charges are accumulated in the disc accommodating state. The suction force is not applied to the disk surface for a long period of time, and the suction force is not exerted between the adjacent disks, so that the force required for detachment when transferring the disks is small.

[0013]

According to the present invention, since the disk has a projection on its surface, it does not come into contact with a member facing the disk over a wide surface, and the attraction force due to static electricity can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disc according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which disks according to the present invention are stacked.

FIG. 3 is a perspective view of a seat member according to the present invention.

[Explanation of symbols]

 1 Disc 1a, 1b, 1'a, 1'b Protrusion 2,4 Center hole 3 Sheet member 3a Protrusion

Claims (6)

[Claims] 1. A disc on which a signal is optically recorded or reproduced, wherein at least one surface thereof is provided with a protrusion. 2. A disc on which a signal is optically recorded or reproduced, wherein a sheet member having a projection is attached to one surface thereof. 3. The sheet member has a protrusion provided with a gap for preventing adhesion when the sheet member is adhered to a disc and placed on another disc, and a central hole for aligning the center of the sheet member at the time of attachment. Sheet member. 4. The sheet member according to claim 3, wherein the sheet member is light-transmissive to such an extent that when the sheet member is attached to a disc, the contents displayed on the attachment surface of the disc can be read. 5. A disc on which a signal is optically recorded or reproduced, wherein at least one surface of the disc is printed with a protrusion for preventing adhesion when the disc is overlaid on another disc. 6. A disc on which a signal is optically recorded or reproduced, wherein at least one surface of the disc is provided with protrusions of about 5 to 20 .mu.m at a peripheral portion and a peripheral portion of a central hole.