OPTICAL DISC COMPATIBLE WITH TWO DIFFERENT READIN SYSTEMS

摘要

The invention relates to an optical disc composed of two elementary discs (D1D2)glued one another by a transparent glue layer (3). The first elementary disc comprisesan information surface (4b) according to DVD standard and the second elementary disccomprises an information surface according to CD standard. The optical disc may beread by a CD player for CD information and by a DVD player for DVD information. Theproblem of costs and other difficulties for ascending compatibility of DVD players istherefore solved while assuring a simple and smooth transition from CD discs to DVDdiscs for the consumers.Figure 2