Patent · US Expired

Optical recording medium having two superimposed recording levels and corresponding recording device and reading process

US6078558A · kind A · utility

3Cited by

6References

20Claims

0Family size

Assignee

COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventors

Jean-Michel Bruneau · Paris, FR
Bernard Bechevet · Le Pont-de-Claix, FR

Key dates

Filing date	Jun 18, 1998
Grant date	Jun 20, 2000
Priority date	—
Expiry date	Jun 18, 2018

Classification

Technology area (CPC G)Physics
CPC primaryG11B7/005
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An optical recording medium including a first recording level including a first active film having amorphous areas and crystalline areas, the first recording level being configured to produce a phase difference between an optical beam reflected by the amorphous areas and an optical beam reflected by the crystalline areas; and a second recording level superimposed on the first recording level and including a second active layer with first areas and second areas, the second recording level being configured to produce an intensity difference between an optical beam reflected by the first areas and an optical beam reflected by the second areas.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.