JPS6222250A - Information recording medium - Google Patents

Abstract

PURPOSE:To prevent the intrusion of moisture from the sealed end faced of an information recording medium stuck by using an adhesive agent by using a solvent which dissolves substrates to dissolve the outside circumferential end faces of said recording medium and sealing the clearance of the adhered part. CONSTITUTION:The disk-shaped substrates 1, 1 are formed of, for example, transparent plastic plates have fitting hole 2 at the central part thereof. A recording layer 3 is formed on one side of the substrates 1, 1. The substrates 1, 1 are concentrically disposed via an inside circumferential spacer 4 and an outside circumferential spacer 5 with the recording layer 3 positioned on the inside and are stuck to each other by using the adhesive agent 7 in such a manner that a space 6 is formed between the opposed surfaces of the substrate 1, 1. The solvent which dissolves the substrate 1 itself is then coated on the outside circumferential end faces 8 to seal the clearance in the adhered part 9. The instruction of water into the adhered part is thereby prevented.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a sealed information recording medium.

[Prior art]

2. Description of the Related Art An air sandwich type sealed disk is known, in which two disks each having a recording layer made of metal or organic dye provided on a disk-shaped substrate made of plastic or the like are bonded together via a spacer. For example, as a Dinuk-shaped recording medium, the radius is 10
When considering an 0H disc, the information recording area has a radius of 50~
It is set up within the range of 95 chickens. Therefore, when using an air sandwich sealing structure, the width of the inner circumferential spacer can be made sufficiently wide, but the width of the outer circumferential spacer cannot be made very wide, resulting in poor adhesive strength at the outer circumferential portion. In addition, if the sealing disk is placed under high temperature and high humidity conditions, moisture tends to enter the interface between the adhesive and the adherend, and this is most likely to occur through small gaps on the outer edge of the disk. Otherwise, the adhesive strength of the outer periphery will deteriorate.

In order to solve the above-mentioned problems, structures as shown in FIGS. 3 and 4 have been proposed. In this type of structure, the area of the interface between the adhesive and the adherend is large, and the interface is in two directions, horizontal and vertical, which significantly improves adhesive strength and moisture intrusion. . However, there is a drawback in that it is quite difficult to process the spacer into such a shape.

〔the purpose〕

The present invention has been made in view of the above problems, and its purpose is to provide an information recording medium with a sealed structure that has sufficient adhesive strength, is less affected by moisture intrusion, and is easy to manufacture. .

〔composition〕

To achieve the above object, one aspect of the present invention is to bond a substrate and a spacer together using an adhesive, and then apply a solvent that dissolves the substrate to the outer peripheral edge of the recording medium to seal the gap between the bonded parts. . In other words, the information recording medium of the present invention comprises a pair of substrates having a recording layer on one side of at least one of two disc-shaped substrates, and an inner circumferential spacer and an outer circumferential spacer arranged concentrically. Alternatively, in an information recording medium that is laminated using an adhesive so that the recording layer is on the inside without intervening, a solvent that dissolves the substrate is applied to the outer peripheral end surface of the recording medium.

Next, the present invention will be specifically explained with reference to the drawings.

FIG. 1 shows an example of the present invention.

The disk-shaped substrates 1, 1 are made of, for example, a transparent plastic plate and have a fitting hole 2 in the center thereof.

A recording layer 3 is formed on one side of these substrates 1, 1. These substrates 1, 1 are arranged concentrically with the recording layer 3 inside, with an inner circumferential spacer 4 and an outer circumferential spacer 5 in between, and an adhesive is applied so that a space 6 is formed between the mutually opposing surfaces of each substrate. Laminate using 7. Next, after bonding the substrates 1, 1 and spacers 4, 5, the first
As shown in the enlarged view of the outer periphery of the figure, a solvent that dissolves the substrate itself is applied to the outer periphery end surface 8.
is dissolved to seal the gap in the bonded portion 9. By doing so, it was confirmed that water infiltration into the bonded area was prevented and the adhesive force was increased.

The solvent for dissolving the substrate material itself in the present invention is selected depending on the material of the plastic substrate, and examples thereof include halogenated hydrocarbons such as dichloroethane and dichloromethane, ketones such as acetone, aldehydes, tetrahydrofuran, and dioxane. Cyclic ethers and the like can be used. Note that even if a solvent such as dichloroethane is applied to the substrate, it will not penetrate to a large extent; if you leave it for a while after application, the solvent will dry, and unless the substrate is left immersed in the solvent for a long time, the recording layer will not be affected. do not have. Furthermore, as another example of the present invention, a similar effect was obtained by applying a solution prepared by dissolving the same material as the substrate material in the above-mentioned solvent to the outer peripheral end surface 8. Note that brush coating, roller coating, spray coating, etc. can be used as a method for applying the solvent or solvent solution to the outer peripheral end surface.

The adhesive used in the present invention is a room temperature curing type.

A heat curing type, a hot melt type, an ultraviolet curing type, etc. can be used, but it is preferable to use a type that does not affect the recording layer. Further, as the recording layer in the present invention, any known recording member for optical information recording media can be used, and the recording layer is not limited to a specific one. A typical example is T.
e.

Examples include metal thin films such as M and organic dye thin films such as cyanine dyes. Furthermore, in the case of the information recording medium of the present invention, the recording layer may be provided on two substrates in the case of a double-sided disk, and on one substrate in the case of a single-sided disk.

〔effect〕

The information recording medium of the present invention configured as described above has the effect of improving sealing reliability and sealing adhesive strength, and preventing moisture from entering from the sealing end face.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the information recording medium of the present invention, FIG. 2 is a partially enlarged sectional view showing the outer periphery of FIG. 1, and FIGS. 3 and 4 are conventional outer periphery FIG. 3 is a partially enlarged sectional view showing the relationship between a spacer and a substrate. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Fitting hole, 3... Recording layer, 4...
...Inner circumference space, 5...Outer circumference space, 6...Space, 7...Adhesive, 8...Outer circumference end face, 9...Adhesive part.

Claims (1)

[Claims] A pair of substrates having a recording layer on one side of at least one of the two disc-shaped substrates is arranged so that the recording layer is on the inside, with or without an inner spacer and an outer spacer arranged concentrically. 1. An information recording medium in which a solvent for dissolving a substrate is applied to an outer circumferential end surface of the recording medium, the information recording medium being bonded together using an adhesive.