JPS59221845A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To seal up an optical information recording layer without an adhesive to prevent corrosion of the recording layer by covering flange parts with a reinforcing member after making flange parts of a substrate provided with the recording layer and a protection plate, which has a recessed part where the recording layer is stored, thin to fix thermally these substrate and protection plate. CONSTITUTION:A substrate 1 where a flange part 1a is made very thinner than the other parts is formed with transparent plastics. An optical information recording layer 2 consisting of a metal, coloring matters, etc. is formed on the substrate 1. Meanwhile, a protection plate 3 where a flange part 3a is made thin similarly to the substrate 1 and a recessed part 4 where the recording layer 2 should be stored is provided is formed with transparent plastics. Flange parts 1a and 3a of the substrate 1 and the protection plate 3 are melted and fixed by ultrasonic heating or the like, and at this time, the recording layer 2 is sealed up without degrading the recording layer by heat because of thinness of flanges. A slight space 5 is left in the recessed part 4, and an inert gas is charged into this space or the space is evacuated to prevent corrosion and oxidation of the layer 2. A reinforcing member 6 is fixed to flange parts with an adhesive or the like. Thus, a high-durability optical information recording medium is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an optical information recording medium having a sealed structure. More specifically, the present invention relates to an optical information recording medium whose recording layer is sealed without the use of adhesives.

Traditionally, in optical disk media, recording media have been made into a sealed structure using adhesive to protect the recording layer from mechanical damage and deterioration of characteristics due to chemical effects, and to prevent warping due to water absorption of the substrate. things are being done. However, adhesives often corrode and oxidize the recording layer, and even if the adhesive is not in direct contact with the recording layer, the gas generated from the bonded area can have an adverse effect on the recording layer, making it difficult to select an adhesive. It's far away.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned current situation, and its object is to provide an optical information recording medium having a structure in which a recording layer can be sealed without using an adhesive.

C. In order to achieve the above object, the present invention is to provide a protection plate to which seven langues are attached and a substrate with seven langues, and to heat-seal each of the seven langues. That is, the optical information recording medium of the present invention includes a plastic substrate having seven thin-walled rung portions, a recording layer provided on the substrate, and a plastic substrate having seven thin-walled rung portions and the recording layer. The base plate and the protective plate are heat-sealed at their respective 7 run parts to form a sealed structure, and the heat-sealed flan parts are reinforced. It is covered with parts.

Next, a configuration example of the optical information recording medium of the present invention will be explained with reference to the drawings.

The substrate 1 is made of transparent plastic and the substrate 7
The runno portion 1a is processed to be extremely thinner than the other portions. Further, a recording layer 2 is provided on the substrate 1. As this recording layer, any known recording member for optical information recording media can be used, and the recording layer is not limited to a specific one. Typical examples include metals, semimetals, and dye layers. The protection plate 3 has a seven-run portion 3a processed in the same manner as the substrate, and has a portion 4 for receiving the recording layer on the substrate. This portion 4 may be light enough to cover the entire recording layer 2, or may leave some gaps 5. The substrate 1 and the protection plate 3 have seven run portions 1a, 3a1. : Heat fused (for example, by ultrasonic heating). At this time, since the 7-run part of the substrate and the insulating plate is much thinner than the 7-run part, the 1-run heat has almost no effect on the recording layer. Furthermore, in order to effectively perform thermal fusion, it is important that the protective plate be made of the same material as the substrate.

Since the heat-sealed 7-run part has a relatively thin overall thickness, a reinforcing member 6 is provided around it in order to reinforce its mechanical strength. The reinforcing member may be fixed using adhesive, for example.

Depending on the type of recording layer, the substrate and the protective plate may be bonded in a vacuum or an inert gas, and the gap 5 may be evacuated or filled with an inert gas to prevent corrosion or oxidation of the recording layer. Published in

Since the optical information recording medium of the present invention constructed as described above has a sealed structure by heat fusion, corrosion and oxidation of the recording layer due to the influence of the adhesive can be prevented.

[Brief explanation of the drawing]

The figure is a schematic diagram showing one embodiment of the optical information recording medium of the present invention. DESCRIPTION OF SYMBOLS 1... Substrate, 1a...7 run part, 2... Recording layer, 3... Protective plate, 3a...7 run part, 4...
- The recording layer holder is a receiving part, 5... air gap, 6... reinforcing member.

Claims (1)

[Claims] a plastic substrate having seven thin-walled lunge portions;
It consists of a recording layer provided on the substrate, and a plastic protection plate having seven thin-walled flange portions and a portion for receiving the recording layer, and further, the substrate and the protection plate each include: The seven flange portions are heat-sealed to form a sealed structure; 1. An optical information recording medium characterized in that a heat-sealed seven-lunge portion is covered with a reinforcing portion.