Optical recording medium and its recording apparatus and reproducing apparatus
US5656348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Feb 8, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium which is constructed in a manner such that a plurality of recording areas in which an information signal is recorded along vortical spiral tracks are arranged in a ring shape on a recording surface and a vortex direction of the spiral track of the outside recording area among the plurality of recording areas differs from that of the spiral track of the inside recording area. When the information signal is recorded to the recording medium, the first writing device executes the writing operation from the outer rim side toward the inner rim side of the spiral track of the outside recording area and the second writing device executes the writing operation from the inner rim side toward the outer rim side of the spiral track of the outside recording area. When the recorded information signal is reproduced, the first reading device executes the reading operation from the outer rim side toward the inner rim side of the spiral track of the outside recording area and the second reading device executes the reading operation from the inner rim side toward the outer rim side of the spiral track of the outside recording area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.