JPH03203835A - Production of optical information recording medium - Google Patents

Abstract

PURPOSE:To obtain an optical information recording medium to which coloring matters are not stuck by immersing at least a part of the peripheral surface of the optical information recording medium in washing liquid where coloring maters are dissolved and rotating the recording medium. CONSTITUTION:A light-transmissive substrate 1 is painted with coloring matters dissolved in a solvent to form a light absorbing layer, and a light reflecting layer is formed on this layer, and a ultraviolet curing resin is applied on the light reflecting layer and is hardened by ultraviolet rays to form a protective layer. A disk-shaped optical information recording medium 1 obtained through this process is freely rotatably clipped by a clamp 10 attached to an arm 7. The recording medium 1 is immersed in washing liquid 12, where coloring matters can be dissolved, by an actuator 8, and the recording medium 1 is rotated by a motor 11 with a part of a peripheral face 2 immersed. Thus, the optical information recording medium to which coloring matters are not stuck is obtained.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a method of manufacturing an optical information recording medium.

[Prior Art] Various types of optical information recording media have been proposed in the past, such as disc-shaped so-called optical disks and rectangular plate-shaped so-called optical cards. Among them, the patent application 1986-1917
The optical information recording medium proposed in No. 14 has a light-absorbing layer, a light-reflecting layer, a protective layer, etc. formed in sequence on a transparent substrate. By setting the wavelength of the laser beam used within a certain range, −
It can be handled in the same way as the optical disc indicated by the trademark ``Compact Disc,'' which is widely used for boat fishing, and it also has the characteristic that information can be recorded by the user later.

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

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

A) i! ! A photosensitive substrate is molded by injection molding.

b) The material constituting the light absorption layer is dissolved in a solvent, the solution is applied onto a transparent substrate by a spin code method, and then the solvent is evaporated to form a light absorption layer.

c) A light reflecting layer is formed on the light absorbing layer by vacuum evaporation or sputtering.

D) A UV-curable resin is applied onto the light-absorbing layer using a spin code method, and then cured by UV irradiation to form a protective layer.

e) Print and complete the label.

Colored pigments are used in optical information recording media so that they can easily absorb laser light when recording information.

On the other hand, so-called ROM (Read on
ly memory) type optical information recording media are already widely used. A typical example of this is the trademark “
There is an optical disc that uses the format "Compact Disc".

The optical disc of the above system is designed so that the signal can be reproduced correctly even if the input surface of the reproduction light is touched by the hand.

The most desirable method of holding the optical disc by hand is said to be a method of holding opposing circumferential surfaces of the disc between the thumb and fingers. Further, as shown in FIG. 4, a method of holding the optical information recording medium 1 by clamping the clamp hole 3 and the circumferential surface 2 between the thumb and other fingers may also be a desirable holding method. On the other hand, holding the optical information recording medium 1 so that the surface of the optical information recording medium 1 on which the reproduction light enters is in contact with the finger is not necessarily a desirable holding method. The device is designed so that the signal can be reproduced correctly even if the input surface of the device is touched, so this is hardly a problem in practice.

[Problems to be Solved by the Invention] As already mentioned, in the recordable optical information recording medium described above, a light absorption layer, which is not present in the ROM type optical information recording medium, is formed on the transparent substrate. . At this time, when spin-coding the dyes that form the light-absorbing layer, the solution drips onto the end surface of the light-transmitting substrate, and the solvent evaporates as it is, and the material that forms the light-absorbing layer, that is, the dye, drips onto the edge surface of the transparent substrate. Similar things remain.

Therefore, when an optical information recording medium is held in the manner described above and the user touches the circumferential surface of the optical information recording medium with a finger, the sweat on the hand dissolves the pigments attached to the circumferential surface of the optical information recording medium. Therefore, a) the colored dissolved components adhere to the hands, making them dirty.

b) In some stores, if you accidentally touch the recording/reproduction light incident surface with your dirty hands, an erroneous signal will be recorded during recording.

C) Colored dissolved components adhere to clothes and stain them.

d) Dyes remaining on the circumferential surface of an optical information recording medium impairs the appearance, but when the end surface is touched with a finger, fingerprints remain there, further worsening the appearance.

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

[Means for Solving the Problem] In order to achieve the above object, the gist of the means adopted in the present invention is a step of applying a dye onto a transparent substrate, and a step of forming a protective layer on the dye layer. An optical information recording medium comprising: immersing at least a part of the peripheral surface of the optical information recording medium in a cleaning liquid in which the dye is dissolved; and rotating the optical information recording medium. This is a manufacturing method.

[Function] According to the method for manufacturing an optical information recording medium according to the present invention, the dyes attached to the circumferential surface of the optical information recording medium are rotated while being immersed in a cleaning liquid that dissolves them. As a result, the dye attached to the circumferential surface of the optical information recording medium is removed. As a result, an optical information recording medium with no dyes attached to the circumferential surface can be obtained.

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

As already mentioned, the general method for manufacturing the optical information recording medium according to the present invention is as follows. First, dyes dissolved in a solvent are applied onto the transparent substrate 1 to form a light absorption layer. Subsequently, a light-reflecting layer is formed on this, and an ultraviolet curable resin is further applied, and this is cured with ultraviolet rays to form a protective layer.

In the present invention, the peripheral surface of the optical information recording medium obtained through such a process is immersed in a cleaning liquid and rotated.
This method will be explained with reference to FIG. 1 together with an outline of the apparatus. That is, the disc-shaped optical information recording medium 1 is rotatably held by the clamp IO attached to the arm 7. In FIG. 1, the reference numeral 9 indicates the clamp IO.
This is a clamp drive mechanism that opens and closes the The bracket stand 6 that holds the arm 7 is equipped with an actuator 8 that swings the arm 7, and this operation causes the clamp lO
The optical information recording medium 1 held by the holder is moved up and down, and its circumferential surface 2 is immersed in the cleaning liquid 12 filled with the liquid layer 4, and then pulled up from there.

A motor 11 is attached to the clamp IO, which rotates the optical information recording medium 1 with a part of the peripheral surface 2 immersed in the cleaning liquid 12, so that the entire peripheral surface 2 of the optical information recording medium 1 is cleaned. Contact with cleaning liquid 2. In this step, dyes and the like adhering to the peripheral surface 2 of the optical information recording medium 1 are dissolved and removed.

The cleaning liquid 12 is desirably one that can reliably dissolve the dyes adhering to the outer peripheral end surface of the optical information recording medium l.

Specifically, the solvent used when coating the dye onto the light-transmitting substrate is used. Further, the depth at which the circumferential surface 2 of the optical information recording medium 1 is immersed in the cleaning liquid 12 is preferably about 1 mm from the circumferential surface 2 of the optical information recording medium 1, but the cleaning liquid 12 should not corrode the substrate or the protective layer. If so, the optical information recording medium 1 may be immersed in the cleaning liquid 12 to a depth of about 1 cm from the circumferential surface 2.

After cleaning, the arm 7 is raised to separate the peripheral surface 2 of the optical information recording medium 10 from the cleaning liquid 12, and then the optical information recording medium 1 is moved from above the liquid tank 4 to another location, and the clamp drive mechanism 9 is moved. The operation opens the clamp IO, removes the optical information recording medium 1, and sends it to the next process.

FIGS. 2(a) and 2(b) show examples of means for clamping the optical information recording medium 1 in the apparatus. That is, in the figure (a), the periphery of the clamp hole 3 of the optical information recording medium 1 is clamped from both sides by a pair of clampers 13, 13, and in the figure (b), the area inside the clamp hole 3 is A clamper 14 is inserted into the clamp hole 3 and is held against the inner peripheral surface of the clamp hole 3.

In addition to the types shown in FIG. 2, a combination of both types of clamps may also be used.

FIG. 3 shows an outline of another apparatus for immersing the circumferential surface of an optical information recording medium in a cleaning liquid and rotating it. With this device,
A cleaning liquid supply channel 2 provided at the bottom of the cleaning chute 21 is provided with a gutter-shaped cleaning shoe 21 having an appropriate slope.
A cleaning liquid 27 is supplied from the 3 side to the bottom of the cleaning shoe) 21, and this cleaning liquid 27 flows through the bottom of the cleaning shoe) 21.
The cleaning liquid is discharged from the cleaning liquid discharge path 24 on the downstream side. Therefore, the cleaning liquid 27 is transferred from the cleaning liquid supply path 23 to the cleaning liquid discharge path 2.
The water flows at the bottom of the cleaning chute 21 only in sections between 4 and 4. Further, at the bottom of the cleaning chute 21 ahead of it, a sheet-like absorbent material 25 made of paper, cloth, cotton, etc., that easily absorbs the cleaning liquid is laid.

Inside the cleaning chute 21, a rod-shaped guide 26 is installed along the elongated direction of the cleaning chute 21, and a disc-shaped optical information recording medium 1 is placed diagonally against the cleaning chute 21.
It rolls down the bottom of 1 according to its slope. 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 shoe 21, and the dyes attached thereto are dissolved and removed. Furthermore, after that, the absorber 25
The cleaning liquid adhering to the circumferential surface of the optical information recording medium l is removed.

The depth at which the cleaning liquid 27 flows 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 path 23 side, and specifically, a depth of 1 to 5 mm is desirable. The liquid feeding mechanism in this case most commonly uses a pump.

The length and slope of the cleaning chute 21 are such that the optical information recording medium 9 is sent downward while rolling on the bottom without slipping, and the depth of the flow of the cleaning liquid 27 is approximately constant over the entire width.
It is selected with the aim of achieving a range that is easy to control. Specifically, when the diameter of the optical information recording medium 1 is Dl and the circumference is π, the length of the ribs is generally about πD to 5πD, and the slope is about 2° to 15°.

This device has a simple structure with almost no moving parts, and can completely remove dyes attached to the circumferential surface of an optical information recording medium in a short time.

Furthermore, since a chute is used, it is easy to incorporate it into a conveyance line in the manufacturing process.

[Effects of the Invention] As explained above, the method for manufacturing an optical information recording medium according to the present invention can manufacture an optical information recording medium that does not have dyes on the outer peripheral end surface. In this optical information recording medium, sweat from the hands and the like dissolves pigments adhering to the edges, and the colored dissolved components do not adhere to the hands, staining the hands or staining clothes.

This prevents erroneous recording caused by accidentally touching the recording/reproducing light incident surface with dirty hands. This allows the trademark “
It can be handled in accordance with the method considered desirable for handling optical discs in the format indicated by "Compact Disc."

Furthermore, it is possible to produce an optical information recording medium that has no deposits on the peripheral surface and does not leave fingerprints even when touched with a finger, and has a favorable appearance.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view showing an outline of an apparatus for carrying out the present invention, and FIG. , FIG. 3(a) is a longitudinal sectional side view showing an outline of another apparatus for carrying out the present invention, and FIG.
b) is a longitudinal sectional front view of the device, and FIG. 4 is a drawing showing an example of a state in which a disc-shaped optical information recording medium is held by hand. l... Optical information recording medium 2... Circumferential surface of optical information recording medium 12.27... Cleaning liquid

Claims (1)

[Claims] In a method for manufacturing an optical information recording medium, which includes the steps of applying a dye on a transparent substrate and forming a protective layer on the dye layer, at least a part of the circumferential surface of the optical information recording medium is A method for manufacturing an optical information recording medium, which comprises immersing the optical information recording medium in a cleaning solution in which the dye is dissolved, and rotating the optical information recording medium.