JPS6079541A - Disk-shaped optical information recording medium - Google Patents

Abstract

PURPOSE:To supply easily an adhesive agent, to improve its adhesive strength, and to simplify its positioning function by shaping the cross section of an outside circumference spacer to a trapezoid whose oblique side is used as an adhering part to a substrate, and also chamfering an adhering part of the substrate so as to be fitted to the oblique side. CONSTITUTION:A section shape of an outside circumference spacer 2 is a trapezoid whose oblique side is used as an adhering part 3 to a substrate 1, and the adhering part 3 of the substrate 1 is chamfered so as to be fitted to the oblique side. An inside circumference spacer can be formed to an optical shape. For instance, an optical information recording medium of a sandwich type is assembled by forming and assembling a space 4 so that a recording layer is positioned at the inside through the inside circumference spacer and the outside circumference spacer on which a pair of substrates having the recording layer on one surface of at least one piece of the substrates 1 are placed concentrically, and subsequently sticking the chamfered part of the substrate 1 and the outside circumference spacer 2 by pouring an adhesive agent into the adhering part 3 of the outside circumference spacer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a sandwich-type disc-shaped optical information recording medium in which a recording layer is provided on the surface of a disc substrate and information is optically recorded and reproduced.

BACKGROUND OF THE INVENTION An air-sand inch type sealed disk is known, in which two disks each having a recording layer of metal, organic dye, etc. provided on a disk-shaped substrate such as Punstic are adhered via a spacer. For example, as a disk-shaped recording medium, the radius is 10.
When considering a 0mm disk, the information recording area has a radius of 50
~95 proverbs are provided. Therefore, when using an air-sand inch type sealing structure, the width of the 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 circumference.

Conventionally, a spacer 2 having a rectangular cross-sectional shape as shown in FIG. 1 has been proposed, but since the shape of the adhesive part 3 is the simplest, the strength is poor and positioning cannot be done without a jig. There is. Furthermore, as an improved version of this, a structure as shown in FIG. The adhesive surface area in two vertical directions is almost the same as that shown in Figure 1, but the strength line has been improved.
Positioning is possible through the fitting structure. However, as described above, since it has adhesive surfaces in two directions, there is a problem in that supplying the adhesive is troublesome.

Purpose The present invention was made in view of the above problems, and its purpose is to provide a surfacer structure that allows easy supply of adhesive, has adhesive strength, and also has a positioning function. thing&
There is C.

Structure In order to achieve the above object, the present invention consists in making the cross-sectional shape of the outer circumferential spacer trapezoidal. In other words, the disk-shaped optical 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 disk-shaped substrates, an inner circumference spacer and an outer circumference spacer arranged concentrically. In a disc-shaped optical information recording medium sealed with an adhesive so that the recording layer is on the inner side, the outer circumferential space has a trapezoidal cross-sectional shape with the oblique side being the adhesive part with the substrate. The adhesive portion of the substrate is also chamfered so as to fit with the oblique side.

Next, one embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a partial sectional view in which other parts such as the inner spacer, the center hole, and the recording layer are omitted in order to particularly emphasize the bonding relationship between the substrate 1 and the outer spacer 2. As shown in the figure, the cross-sectional shape of the outer peripheral spacer 2 used in the present invention is a trapezoid with the adhesive part 3 to the substrate 1 as the oblique side, and the adhesive part 6 of the substrate 1 has a surface so as to fit with the oblique side. It has been taken. The inner peripheral surfacer can have any shape. To briefly explain the assembly example of the optical information self-recording medium of the present invention, at least one of the substrates 1 has a recording layer.

A pair of substrates are arranged concentrically, and a recording layer (not shown) is inserted through an inner circumferential spacer (not shown) and an outer circumferential spacer 4-2.
The space 4 is formed so that the space 4 is located on the inside, and then adhesive is poured into the adhesive part 3 of the outer periphery smoother 2 to assemble the chamfered part of the substrate j and the outer periphery chi-shaped optical information recording medium. can.

Further, as the recording layer in the present invention, any material that can be used as a recording member of an optical information recording medium can be used, and is not limited to a specific one.

, □4, :, □, □ and a dye layer. Further, the substrate is a transparent substrate, typical examples of which include plastic and glass.

Further, in the case of the optical 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.

Up to now, the present invention has been explained with emphasis on the shape of the outer circumferential groove, but the shape of the inner circumferential groove, the type and arrangement of the recording layer, the assembly method, etc. do not change the gist of the present invention. Of course, various modifications can be made.゛Effects The optical information recording medium of the present invention constructed as described above has the same adhesive width as the conventional one shown in Fig. 1, but the adhesive area can be increased, so the adhesive strength is improved. Compared to the conventional device shown in FIG. 2, since the adhesive surface is one surface, it is easier to supply the adhesive. Furthermore, since the substrate and the outer spacer have a tapered fitting structure, they can be positioned without using a jig.

[Brief explanation of drawings]

1 and 2 are partial sectional views of an optical information recording medium showing the relationship between a conventional outer peripheral spacer and a substrate, and FIG.
The figure is a partial sectional view of an optical information recording medium showing the relationship between the outer peripheral spacer and the substrate of the present invention. 1... Board, 2... Outer periphery spacer, 3... Adhesive part. 4... Space. Patent applicant Ricoh Co., Ltd. - Figure 1

Claims (1)

[Claims] A pair of substrates having a recording layer on one side of at least one of the two disc-shaped substrates are arranged so that the recording layer is on the inside through an inner spacer and an outer spacer arranged concentrically. In a disc-shaped optical information recording medium sealed using an adhesive, the cross-sectional shape of the outer circumferential spacer is a trapezoid with the adhesive part to the substrate as the hypotenuse, and the adhesive part of the substrate also fits with the hypotenuse. An optical information recording medium characterized by being chamfered.