JPS63234428A - Production of optical disk - Google Patents

Abstract

PURPOSE:To improve the strength in sticking disk substrates which have recording film layers consisting of org. dye films by washing away and removing, by a solvent, the recording film layers existing in the parts of said substrates which face a spacer and are used as adhering parts prior to a stage for sticking the disk substrates to each other. CONSTITUTION:The disk substrates 1 provided with the recording film layer 3 is set on a turn table 6 by positioning the recording film layer 3 to face upward. The turn table 6 is then rotated and solvent flow 7 from a solvent outflow pipe 8 is flushed to the part corresponding to the adhering part of the substrate 1 at the time of sticking two sheets of the substrates to each other, i.e., the outside circumferential end part of the disk substrate to wash away the recording film layer 3 existing in this part. As a result, the recording film layer 3 of the org. dye film existing in the outside circumferential end part of the substrate, which part corresponds to the adhering part of the substrate 1, is removed. The spacer and the substrate 1 are thereby directly adhered and the adhesive power of the sufficient structure is obtd. without generating exfoliation.

Description

[Detailed description of the invention]

■Industrial Application Field] The present invention relates to a method for manufacturing an optical disc, and more specifically, a recording layer (g*) of an organic dye film is provided on a disc substrate, and two disc substrates are placed facing each other with this recording film layer on the inside. The present invention relates to a method of manufacturing an optical disc in which the optical discs are bonded together via a spacer to form an air sandwich structure. rPrior Art Conventionally, this type of air sandwich structure optical disc has
For example, it is manufactured by the following steps. (1) Clean the acrylic disk substrate and provide a transfer layer with grooves on it.This transfer layer is made by dropping an acrylic ultraviolet curable resin onto the metal stamper with grooves. It is formed by stacking acrylic disk substrates, spreading the ultraviolet curing resin uniformly, irradiating it with ultraviolet rays to polymerize it, and peeling it off from the metal stand.
A transfer layer 2 is formed thereon. (2) Next, prepare an organic dye liquid mixed to a certain concentration, and form a recording film layer 3 of an organic dye film on the transfer layer 2 by spin coating (Fig. 1(b)). . (3) Next, place the two disc substrates facing each other with the recording M layer 3 inside, and apply adhesive 5 through the spacer 4, using the part of the disc substrate facing the spacer 4 as the adhesive part.
The two disc substrates were bonded together, and as shown in Figure 1 (C
) is an air sandwich tr1m optical disc.

[Problems to be solved by the invention]

The optical disc manufactured through the above process is shown in Figure 1 (
It has an RS structure as shown in C), in which an adhesive is applied and bonded to the bonded portion of the disk substrate while the recording film layer remains present. Therefore, the adhesive strength depends on the adhesive strength between the base acrylic plate of the disk substrate and the transfer layer, the adhesive strength between the transfer layer and the recording film layer, the adhesive strength between the recording film layer and the adhesive, and the adhesive strength between the adhesive and the spacer. Among them, the adhesive strength between the transfer layer and the recording film layer is weaker than the others, and there is a problem in that peeling easily occurs at the interface. The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing an optical disc that improves the bonding strength of discs that are prone to peeling.

[Means to solve the problem]

In order to achieve the above object, the method for manufacturing an optical disc of the present invention includes the steps of providing a transfer layer with grooves formed on a disk substrate, and forming a recording film layer of an organic dye film on the top of the transfer layer by a spin coating method. a step of washing away with a solvent the recording film layer of the organic dye film in the part of the disc substrate having the recording M layer that faces the spacer and will become the bonding part; and a step of removing at least the disc substrate having the recording film layer. Two disk substrates, including one disk substrate, are placed facing each other with the recording film layer on the inside, and the two disk substrates are bonded together via a spacer by applying an adhesive to the part facing the spacer that will become the bonding part. It consists of processes.

[For production]

As described above, according to the present invention, the fI of the conventional optical disc! In the manufacturing process, before the final process of bonding the disk substrates, the recording film layer of the organic dye film in the part of the disk substrate having the recording WJ and JW that faces the spacer and will be the adhesive part is treated with a solvent. There is a process of washing and removing it. For this reason, the bonding strength of two disk substrates, which are bonded together with an adhesive through a spacer with the recording film layer on the inside, is that the base material of the acrylic plate of the disk substrate and the disk substrate are the same. It depends on the adhesive strength between the transfer layer, the adhesive strength between the transfer layer and the adhesive, and the adhesive strength between the adhesive and the spacer.As a result, sufficient adhesive strength is obtained and no peeling occurs. .

【Example】

Hereinafter, embodiments of the present invention will be explained with reference to the drawings. FIG. 2 is an explanatory diagram for explaining one step of the main part of the method for manufacturing an optical disc of the present invention.
! FIG. 2 is an explanatory diagram schematically illustrating a process of removing 2I'lW. In the method for manufacturing an optical disc according to an embodiment of the present invention, the steps of providing a transfer layer on a disc substrate, forming a recording film layer, and bonding the disc substrates are the same as those described in FIG. The detailed explanation will be omitted. In the present invention, there is a step of removing the recording Wj1 layer of the organic dye film located in the part of the disc substrate having the recording M layer that faces the spacer and becomes the bonding part, and this step is shown in FIG. Refer to and explain. Specifically, in this process, the recording film layer 3 is placed on the turntable 6.
Set the disc substrate 1 with the recording film layer 3 facing up, rotate the turntable 6, and then set the disc substrate 1 with the recording film layer 3 facing upward, and then rotate the turntable 6. A solvent flow 7 from a solvent outflow tube 8 is flowed to the outer peripheral end portion of the substrate to wash away and remove the recording film R3 in this portion. As a result, the recording film layer 3 of the organic dye film located at the outer peripheral end portion of the disc substrate 1 corresponding to the adhesive portion of the disc substrate 1 is removed. In this case, since the turntable 6 is rotating, the solvent does not flow to the inner circumference of the disk substrate 1 due to centrifugal force, but flows out to the outer circumference, and reaches the adhesive part at the outer edge of the disk substrate 1. Only the recording film W13, which is an organic dye film, is removed. As a result, before the step of bonding the disk substrates 1, the recording film layer 3 in the portion of the disk substrate 1 corresponding to the bonding portion is removed, and the disk substrates 1 are bonded in the next step of bonding the disk substrates 1. Therefore, the optical disc manufactured by the manufacturing method of the present invention becomes an optical disc of rR construction as shown in FIG. - That is, in the final bonding process, the optical disc as shown in FIG. Since it is directly bonded to the substrate 1, sufficient adhesive strength is obtained and no peeling occurs. In addition, since the optical disc here uses an organic dye film as the recording film layer 3, it can be easily removed by washing it away with a solvent, which adds one manufacturing step, but it is a simple process. This improves the reliability of manufactured optical discs.

【Effect of the invention】

As described above, according to the optical disc manufacturing method of the present invention, in the manufactured optical disc, two disc substrates are bonded to each other with an adhesive through a spacer with the recording film layer on the inside. The bonding strength of disk substrates depends on the adhesive strength between the acrylic plate base of the disk substrate and the transfer layer of the same type as the disk substrate, the adhesive strength between the transfer layer and the adhesive, and the adhesive strength between the adhesive and the spacer. As a result, sufficient strength is obtained and no peeling occurs.
A highly reliable optical disc can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram for explaining a conventional optical disc manufacturing method, FIG. 2 is an explanatory diagram for explaining one step of the main part of the optical disc manufacturing method of the present invention, and FIG. 1 is a sectional view of a main part showing an example of an optical disc manufactured by an optical disc manufacturing method. FIG. DESCRIPTION OF SYMBOLS 1... Disk substrate, 2... Transfer layer, 3... Recording M layer, 4... Spacer, 5... Adhesive, 6... Turntable, 7... Solvent flow, 8 ...Solvent outflow pipe patent applicant Pioneer Co., Ltd. agent Patent attorney Jundo Kobashi Patent attorney Susumu Murai Figure 1, 1

Claims (1)

[Claims] A process of providing a transfer layer with grooves formed on the disk substrate, a process of forming a recording film layer of an organic dye film on the top of the transfer layer by spin coating, and a process of forming a recording film layer of an organic dye film on the disk substrate facing the spacer having the recording film layer. A process of washing away the recording film layer of the organic dye film in the part that will become the adhesive part with a solvent and removing two disc substrates including at least one disc substrate having a recording film layer with the recording film layer inside. A method for manufacturing an optical disk, which comprises the steps of bonding two disk substrates together by applying an adhesive to a portion facing the spacer and serving as a bonding portion, with a spacer interposed therebetween.