Method of fabrication of a protected optical disk and a disk obtained by said method
US4564932A · kind A · utility
30Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1983 |
| Grant date | Jan 14, 1986 |
| Priority date | — |
| Expiry date | Apr 26, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2017/005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A protected optical disk for recording information is fabricated by a method whereby at least one cover is rigidly fixed by a welding to an optical disk having at least one layer of recording material which can be both written and read optically. At least two joints are thus formed by welding, each joint being constituted by at least two weld zones each located respectively within a concentric ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.