JP2511546B2 - Method for manufacturing optical information recording medium - Google Patents

Description

The present invention relates to a method for manufacturing an optical information recording medium.

[Prior Art] Various optical information recording media such as a disc-shaped so-called optical disk and a square-shaped so-called optical card have been conventionally proposed. Among them, the optical information recording medium proposed in Japanese Patent Application No. 63-191714 is one in which a light-absorbing layer, a light-reflecting layer, a protective layer and the like are sequentially formed on a translucent substrate. By setting its optical characteristics and the wavelength of the laser light used for reproduction within a certain range, it can be handled in the same manner as an optical disk displayed under the widely used trademark "Compact Disk", and The feature is that the user can record the information later.

As a material forming the light absorption layer in such an optical information recording medium, for example, dyes such as cyanine dye proposed in Japanese Patent Application No. 63-214470 are used.

The manufacture of such an optical information recording medium is carried out, for example, by the following method.

A) A transparent substrate is molded by injection molding.

A) The material constituting the light absorbing layer is dissolved in a solvent, the solution is applied onto a transparent substrate by spin coating, and then the solvent is evaporated to form the light absorbing layer.

C) A light reflection layer is formed on the light absorption layer by vacuum vapor deposition or sputtering.

D) An ultraviolet curable resin is applied on the light absorbing layer by a spin coating method, and this is cured by irradiation with ultraviolet rays to form a protective layer.

E) Print the label and complete.

As the dye used for the optical information recording medium, a colored dye is used so as to easily absorb the laser beam at the time of recording information.

On the other hand, the so-called ROM (Read only Memol) is used to record information on the substrate in advance in the form of "pits" such as holes or irregularities with a stamper and read the information.
y) type optical information recording media are already widely used. As a typical example of this, there is an optical disc of the type indicated by the above-mentioned trademark "Compact Disc".

The optical disc of the above method is devised so that the signal can be correctly reproduced even when the reproduction light incident surface is touched by the hand. The most preferable method of holding the optical disk by hand is to hold the opposite peripheral surfaces of the disk with a thumb and other fingers. Further, as shown in FIG. 4, a method of holding the clamp hole 3 and the peripheral surface 2 of the optical information recording medium 1 with a thumb and other fingers may be a desirable holding method according to this. On the other hand, a method of holding the reproduction light incident surface of the optical information recording medium 1 so that the finger touches is not necessarily a desirable holding method, but as described above,
The optical disc of the above-mentioned type has such a device that the signal is reproduced correctly even if the incident surface of the reproduction light is touched by the hand, so that there is practically no problem.

[Problems to be Solved by the Invention] As described above, in the above-described recordable optical information recording medium, the light absorbing layer which is not in the ROM type optical information recording medium is formed on the transparent substrate. . At this time, when the dyes forming the light absorbing layer are spin-coated, the solution drips on the end face of the translucent substrate, the solvent is evaporated as it is, and the material forming the light absorbing layer on the outer peripheral end face of the substrate, that is, the dye. Kind remains.

For this reason, when the user touches the peripheral surface of the optical information recording medium with the method described above, the sweat on the hand dissolves the dyes adhering to the peripheral surface of the optical information recording medium. Therefore, a) colored dissolved components adhere to the hands, and the hands become soiled.

b) If the dirty hand accidentally touches the recording / reproducing light incident surface, an erroneous signal may be recorded during recording.

c) Colored soluble components adhere to clothes and stain.

d) The dyes left on the peripheral surface of the optical information recording medium impair the external appearance, but when the end surface is touched with a finger, fingerprints remain on the end surface and the external appearance is further deteriorated.

It is an object of the present invention to solve the above problems and provide a method for producing an optical information recording medium on which dyes are not attached.

[Means for Solving the Problems] In order to achieve the above object, the gist of the means adopted in the present invention is a step of applying a dye on a transparent substrate and a step of forming a protective layer on the dye layer. In the method for producing an optical information recording medium having, at least a part of the peripheral surface of the optical information recording medium is immersed in a cleaning liquid in which the dye is dissolved, and the entire peripheral surface of the optical information recording medium becomes a cleaning liquid. By rotating the optical recording medium so that it is immersed,
A method of manufacturing an optical information recording medium, characterized in that the dye adhered to the peripheral surface of the optical information recording medium is dissolved and removed in a cleaning liquid.

[Operation] According to the method for producing an optical information recording medium of the present invention, the entire peripheral surface of the optical information recording medium is immersed in a cleaning liquid having a property of dissolving dyes, without rubbing the peripheral surface. Even if it is a tacky dye, it is dissolved in the cleaning liquid and removed without adhering to other parts of the optical information recording medium. As a result, the dye adhered to the peripheral surface of the optical information recording medium is surely removed, and the optical information recording medium having no adhered dye on the peripheral surface can be obtained.

[Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.

As described above, the general manufacturing method of the optical information recording medium according to the present invention is as follows. First, the transparent substrate 1
The dyes dissolved in a solvent are applied on the above to form a light absorbing layer. Subsequently, a light reflection layer is formed on the above, an ultraviolet curable resin is further applied, and this is ultraviolet cured to form a protective layer.

In the present invention, the peripheral surface of the optical information recording medium obtained through such steps is immersed in a cleaning liquid and rotated, and this method will be described together with an outline of the apparatus with reference to FIG. That is, the disc-shaped optical information recording medium 1 is rotatably held by the clamp 10 attached to the arm 7. In FIG. 1, reference numeral 9 is a clamp drive mechanism for opening and closing the clamp 10. The bracket base 6 for holding the arm 7 is provided with an actuator 8 for swinging the arm 7, and by this operation, the clamp
The optical information recording medium 1 held by 10 moves up and down, and its peripheral surface 2
Is immersed in the cleaning liquid 12 filled in the liquid layer 4 and further pulled up from there.

A motor 11 is attached to the clamp 10, whereby the optical information recording medium 1 is rotated with a part of the peripheral surface 2 immersed in the cleaning liquid 12, and the entire peripheral surface 2 of the optical information recording medium 1 is rotated. Contact with the cleaning liquid 2. In this step, dyes and the like attached to the peripheral surface 2 of the optical information recording medium 1 are dissolved and removed.

It is desirable that the cleaning liquid 12 can surely dissolve the dyes attached to the outer peripheral end surface of the optical information recording medium 1.
Specifically, the solvent used when the dyes are coated on the transparent substrate is used. The depth of the peripheral surface 2 of the optical information recording medium 1 immersed in the cleaning liquid 12 is preferably about 1 mm from the peripheral surface 2 of the optical information recording medium 1, but the cleaning liquid 12 does not attack the substrate or the protective layer. If necessary, the optical information recording medium 1 may be immersed in the cleaning liquid 12 up to about 1 cm from the peripheral surface 2.

After the cleaning is completed, the arm 7 is lifted to separate the peripheral surface 2 of the optical information recording medium 1 from the cleaning liquid 12, and then the optical information recording medium 1 is moved from the liquid tank 4 to another place, and the clamp driving mechanism 9 is moved. The optical information recording medium 1 is removed by opening the clamp 10 by the operation of, and sent to the next step.

2 (a) and 2 (b) show an example of means for clamping the optical information recording medium 1 in the above apparatus. That is, in FIG. 1A, the clamp hole 3 of the optical information recording medium 1 is sandwiched from both sides by a pair of clampers 13, 13, and FIG. The clamper 14 is of a type inserted and held against the inner peripheral surface of the clamp hole 3 by holding it. In addition to the type shown in FIG. 2, a combination of these two clamping types can also be used.

FIG. 3 shows that the peripheral surface of the optical information recording medium is immersed in a cleaning liquid,
The outline of the other apparatus to rotate is shown. In this device, a gutter-shaped cleaning chute 21 having an appropriate gradient is provided, and a cleaning liquid supply passage 23 provided at the bottom of the cleaning chute 21.
From the side, the cleaning liquid 27 is supplied to the bottom of the cleaning chute 21,
The cleaning liquid 27 flows through the bottom of the cleaning chute 21 and is discharged from the cleaning liquid discharge passage 24 on the downstream side. Therefore, the cleaning liquid 27 flows through the bottom of the cleaning chute 21 only in the section between the cleaning liquid supply passage 23 and the cleaning liquid discharge passage 24. Further, on the bottom of the cleaning chute 21 at the tip thereof, a sheet-shaped absorber 25 which is easy to absorb the cleaning liquid is laid with paper, cloth, cotton or the like.

A rod-shaped guide 26 is installed in the cleaning chute 21 along the longitudinal direction thereof, and a disc-shaped optical information recording medium 1 is provided.
While leaning diagonally against this, the bottom of the cleaning chute 21 rolls along the gradient. During this time, the peripheral surface 2 of the optical information recording medium 1 is immersed in the cleaning liquid 27 flowing at the bottom of the cleaning chute 21, and the dyes attached thereto are dissolved and removed. Further, thereafter, the cleaning liquid adhered to the peripheral surface of the optical information recording medium 1 is removed by the absorber 25.

The depth of the cleaning liquid 27 flowing to the bottom of the cleaning chute 21 can be controlled by the amount of the cleaning liquid 27 supplied from the cleaning liquid supply passage 23 side, and specifically, a depth of 1 to 5 mm is desirable. In this case, a pump is most commonly used as the liquid feeding mechanism.

The length and gradient of the cleaning chute 21 are controlled so that the optical information recording medium 9 does not slip and rolls down on the bottom of the cleaning chute 21 while the depth of the cleaning liquid 27 is almost constant over the entire width. It is selected with the easy range as the goal. In particular,
When the diameter of the optical information recording medium 1 is D and the circular constant is π,
Generally, the length is about πD to 5πD and the gradient is about 2 ° to 15 °.

This device has a simple structure with almost no moving parts,
Dyes adhering to the peripheral surface of the optical information recording medium can be removed completely and in a short time. Further, since the chute is used, it can be easily incorporated in the transfer line in the manufacturing process.

[Effects of the Invention] As described above, the method for producing an optical information recording medium according to the present invention can produce an optical information recording medium having no pigment on the outer peripheral end face. This optical information recording medium is
The dyes adhering to the end faces are dissolved, and the colored dissolved components do not adhere to the hands, so that the hands are not soiled and clothes and the like are not soiled. Then, erroneous recording due to accidentally touching the recording / reproducing light incident surface with the dirty hand does not occur. This allows the optical disc in the format represented by the trademark "Compact Disc" to be handled in accordance with the method desired to be handled.

Further, an optical information recording medium having a preferable appearance can be manufactured, since there is no deposit on the peripheral surface and no fingerprint remains even when touched with a finger.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of an apparatus for carrying out the present invention, FIGS. 2 (a) and 2 (b) are cross-sectional views of an essential part showing an example of a clamp structure of the apparatus, and FIG. FIG. 4A is a vertical sectional side view showing the outline of another apparatus for carrying out the present invention, FIG. 6B is a vertical sectional front view of the apparatus, and FIG. 4 is a disc-shaped optical information recording medium. It is drawing which shows the example of the state hold | maintained at. 1 ... Optical information recording medium, 2 ... Peripheral surface of optical information recording medium,
12, 27 ... Cleaning liquid

Claims (1)

(57) [Claims] 1. A method of manufacturing an optical information recording medium, comprising: a step of applying a dye on a transparent substrate; and a step of forming a protective layer on the dye layer. At least a peripheral surface of the optical information recording medium. Part of the optical information recording medium is immersed in a cleaning liquid in which the dye is dissolved, and the optical information recording medium is rotated so that the entire peripheral surface of the optical information recording medium is immersed in the cleaning liquid.
A method of manufacturing an optical information recording medium, characterized in that the dye adhered to the peripheral surface of the optical information recording medium is dissolved and removed in a cleaning liquid.