Method of producing optical disc of bonded type
US6136133A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 16, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Dec 16, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/25713
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of producing an optical disc of bonded type includes the processes of: (A) forming a first reflection film, which is half transparent for partially reflecting and partially transmitting an incident light, on a first information record surface of a first transparent substrate; (B) forming a second reflection film, which has a reflective index higher than that of the first reflection film, on a second information record surface of a second transparent substrate; (C) dripping a liquid resin of ultraviolet hardening type onto one of the first and second reflection films by a spin coating method to form a first resin layer in a non-hardened condition; (D) dripping a liquid resin of ultraviolet hardening type onto the other of the first and second reflection films by a spin coating method; (E) emitting ultraviolet onto the liquid resin dripped by the process (D) to form a second resin layer of ultraviolet hardening type in a hardened condition; (F) provisionally bonding the first and second transparent substrates together in a pressure reduced environment; and (G) hardening the first resin layer by emitting ultraviolet from a side of the first transparent substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.