Tracking error signal detecting apparatus using an electron beam and apparatus for effecting recording/reproduction of information by the utilization of a plurality of electron beams
US5270990A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Nov 6, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B9/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tracking error signal detecting apparatus includes a device for supplying an electron beam, a device for applying the electron beam to a tracking pattern formed on a recording medium, and a device for forming a tracking error signal on the basis of a signal produced from the tracking pattern upon application of the electron beam. An information recording-reproducing apparatus includes an applying device having a plurality of electron ray sources, a device for controlling the driving of the plurality of electron ray sources in response to a signal, a device for directing the electron rays from the electron ray sources to a recording medium, and a device for reproducing information from signals produced upon application of the electron rays to the recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.