Multi-bandwidth optical playback apparatus with elongated read spot
US4375096A · kind A · utility
12Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1981 |
| Grant date | Feb 22, 1983 |
| Priority date | — |
| Expiry date | Mar 10, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Recovery from a record of data recorded in an elongated information track, comprising undulations representative of the data is effected by an optical playback system. In the system, the data is recorded within two substantially different frequency bands. The optical playback system has a dual response characteristic to provide improved response at the two different frequency bands. A modifying means interposed in the light beam path shapes the light beam to effect this dual response characteristic (i.e., two different bandwidth responses).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.