Optical disk and method of manufacturing optical disk
AssigneeDainippon Ink and Chemicals, Inc.
InventorsShoei Ebisawa, Daisuke Ito, Kiyoshi Oshima, Norio Tsunematsu, Keiichi Hashimoto
Life of this patent
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Abstract
Ultraviolet rays are irradiated in a space through which a cationic ultraviolet curable composition falling from a nozzle passes before reaching a disc substrate. The cationic ultraviolet curable composition which has been irradiated with ultraviolet rays, is distributed in a ring form on the surface of the disc substrate. Another disc substrate is then superposed in this distributed surface to spread the composition by pressing or by the weight of the other disc substrate itself.
Claims16
An optical disc in which two disc substrates with at least one having an ultraviolet transmissive layer are laminated via an adhesive layer, the optical disc characterized in that said adhesive layer comprises a cured layer of a cationic ultraviolet curable composition that has been previously irradiated with ultraviolet light before superposing the discs, said disc further characterized in that the surface of said substrates has not been irradiated by ultraviolet light, and the number of bubbles contained in the adhesive layer is from 0 to 5 per 1 cm2.
A production method for an optical disc, wherein a cationic curable composition in a liquid form irradiated beforehand with ultraviolet rays is distributed on a first disc substrate, before superposing a second disc substrate thereon and spreading the cationic curable composition in a liquid form, and the second disc substrate is then superposed thereon to spread said cationic curable composition in a liquid form, and said cationic curable composition in a liquid form is allowed to cure.
A production method for an optical disc comprising the steps of:
- irradiating ultraviolet rays onto a cationic ultraviolet curable composition;
- dropping the cationic ultraviolet curable composition which has been irradiated with ultraviolet rays onto a first disc substrate;
- superposing a second disc substrate on the first disc substrate on which the cationic ultraviolet curable composition has been distributed;
- and spreading the cationic ultraviolet curable composition.
An intermediate for making an optical disc, said intermediate consisting essentially of:
- a single disc substrate having a side;
- and
- a cationic ultraviolet curable composition previously irradiated with ultraviolet light and distributed on one side of said disc substrate.
Dependencies are inferred from the claim text.