Dynamic information storage or retrieval – Storage medium structure – Layered
Patent
1990-09-11
1993-03-23
Levy, Stuart S.
Dynamic information storage or retrieval
Storage medium structure
Layered
369286, 3692755, 428694, 430495, 430945, 3461351, G11B 724, G11B 1110
Patent
active
051970600
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an optical disk and a process for fabricating them.
BACKGROUND ART
As shown in Japanese Patent Application laid open to public No. 63-94140, the conventional optical disks have a structure in which the side face of the recording layer is not covered with such a film as a ceramic protection film, a metallic reflective film, or the like. As shown in U.S. Pat. No. 4,731,620, the adhesion layer using UV-curing resin can be formed only in the region in which no recording layer is formed. Furthermore, the adhesion layer using thermo-setting resin is directly connected to the substrate in the outer circumference region of the substrate, as shown in U.S. Pat. No. 4,731,620.
On the other hand, the conventional processes for fabricating optical disks use only either UV-curing or thermo-setting resin.
However, the structure of the above optical disks has problems in that of the substrate, and that
Furthermore, the processes for fabricating the above optical disks have problems in that thermo-setting step, and that hardening step and the like of the adhesive.
Accordingly, the present invention has been achieved in order to solve the above described problems. An object of the present invention is to increase the weather resistance of the recording layer, a second object is to make it possible to set the substrates upright in the thermo-setting step, and a third object is to prevent the adhesive from overflowing in the thermo-setting process and the like.
DISCLOSURE OF THE INVENTION
In order to solve the above described problems, the optical disk of the present invention is: adhesive layer pasting the above first and second substrates together, characterized in that the optical disk has, on each of the substrates, a first protecting layer formed thereon, a recording layer formed on the said first protecting layer, a second protecting layer formed on the said recording layer, a reflective layer formed on the said second protecting layer within the region outer than the central hole bored on the above substrates and inner than the outer diameter of the above substrates, and a ceramic layer formed on the said reflective layer within the region surrounded by a diameter smaller than the inner diameters of the above reflective layer and the above recording layer and a diameter larger than the outer diameters of the above reflective layer and the above recording layer;
(2) an optical disk having first substrate, a second substrate and an adhesion layer pasting the above first and second substrates, characterized in that the above adhesive layer is composed of thermo-setting resin and UV-setting resin;
(3) characterized in that each of the substrates has a first protecting layer formed thereon, a recording layer formed on the said first protecting layer, a second protecting layer formed on the said recording layer, and a reflective layer formed on the said second protecting layer within the region outer than the above central hole and inner than the outer diameter of the above substrates;
(4) characterized in that the recording layer comprises a rare earth-transition metal alloy;
(5) characterized in that the recording layer is formed either on the above first substrate or on the above second substrate. Furthermore, the process for fabricating the optical disks according to the present invention is:
(6) a process for fabricating optical disks comprising a first substrate, a second substrate and an adhesive layer pasting the above first and second substrates together, which has steps to form thin films on each of the above substrates and a step to paste the above first and second substrates, characterized in that the process has the steps of coating the above first substrate or the above second substrate with an adhesive composed of thermo-setting resin and UV-setting resin, pasting the above first substrate and the above second substrate together, irradiating the above pasted substrates with UV-light, and heating the above pasted substrates after the said UV-irradia
REFERENCES:
patent: 4885992 (1989-08-01), Ikegawa et al.
patent: 4939013 (1990-07-01), Kimura et al.
patent: 4954379 (1990-09-01), Nishida et al.
patent: 4956213 (1990-09-01), Nasuda
patent: 4956214 (1990-09-01), Imataki et al.
patent: 4956216 (1990-09-01), Hausler et al.
patent: 4975355 (1990-12-01), Suzuki
patent: 4985289 (1991-01-01), Kamazaki et al.
Levy Stuart S.
Rhoa Joseph A.
Seiko Epson Corporation
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