Process for producing information recording medium
US4933222A · kind A · utility
3Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Apr 4, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for producing an information recording medium such as an optical disc comprises the steps: putting a disc-shaped flexible resin film having a hole at its central part upon a surface of the recording layer-side of a disc-shaped resin substrate; placing them on a ultrasonic welding machine between its applying horn and its receiving tool in such a manner that the resin film and the applying horn are opposed to each other, wherein the horn has a ring-shaped protrusion provided with a raised portion; and applying ultrasonic wave to them while pressing the resin film to weld the resin film to the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.