Angularly multiplexed optical recording medium
US4534021A · kind A · utility
8Cited by
14References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1981 |
| Grant date | Aug 6, 1985 |
| Priority date | — |
| Expiry date | Dec 10, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for optically reading a recording medium having information tracks disposed on alternating inclined recording surfaces preferably arranged in separate but alternately interposed spirals inclined at different angles on the medium. The apparatus includes photodetectors for detecting light reflected from each of the tracks, and circuitry for controllably combining the signals from the photodetectors to minimize crosstalk in the recovered signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.