Patent ID: 6063469
Filing Date: 2000-05-16
Classification: B32B,Y10S,Y10T

Abstract:
An optical disk comprising:a center substrate layer including a center substrate having a top surface and a bottom surface thereof, a first recording layer deposited on the top surface of the center substrate and a second recording layer deposited on the bottom surface of the center substrate;a top substrate layer including a top substrate and a third recording layer, wherein the top substrate has a top surface and a bottom surface thereof and the third recording layer is deposited on the bottom surface of the top substrate;a bottom substrate layer including a bottom substrate and a fourth recording layer, wherein the bottom substrate has a top surface and a bottom surface thereof and the fourth recording layer is deposited on the top surface of the bottom substrate;a top adhesion layer to bond the top substrate layer to the center substrate layer; anda bottom adhesion layer to bond the center substrate layer to the bottom substrate layer, wherein each of the top and bottom surfaces of the center substrate, the bottom surface of the top substrate and the top surface of the bottom substrate has tracks thereon arranged either spirally or concentrically, each of the tracks containing recesses and protrusions.