Double-disk optical recording medium

Details Double-disk optical recording medium Double-disk optical recording medium

2004-04-05

2009-11-24

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

C369S277000, C369S286000, C369S275100

Reexamination Certificate

active

07623433

ABSTRACT:
An optical recording medium comprises a transparent lower disk and an upper disk secured together by a transparent intermediate member. On one side of the lower disk, groove tracks of width WG0and land tracks of width WL0are formed. All tracks of the lower disk are coated with a recording film on which a laser beam is incident from below and a reflecting film on the recording film for partially reflecting the laser beam. The upper disk is formed with land tracks of width WL1and groove tracks of width WG1for receiving light through the corresponding groove and land tracks of the lower disk. All tracks of the upper disk are also coated with laminated recording and reflecting films. The ratio WG1/WL1of the upper disk is greater than unity and is equal to or greater than the ratio WG0/WL0of the lower disk so that the carrier-to-noise ratios of the two disks are substantially equal to each other.

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