Optical disc, formed from joining individual discs and method and apparatus for manufacturing and using such optical disc
US6031808A · kind A · utility
32Cited by
10References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1997 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Nov 12, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/263
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A read only memory (ROM) disc 10 has an annular ROM area 12 in an outer area thereof, and a random access memory (RAM) disc 20 has an annular RAM area 22 in an inner area thereof. The ROM disc and the RAM disc are manufactured independently each other under respective preferable conditions. An optical disc 30 is provided by adhering the ROM disc and the RAM disc each other. An optical pickup 32 reproduces the optical disc or records thereon by irradiating a light from one side thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.