Multilayer film information storage medium capable of covering and writing

Abstract

A rewritable information storage medium is composed of a substrate and 4 stacked record layer on both surfaces or 2 stacked record layer on single surface. Its features are that the R/W laser beam reaches to the surface of replicate track for laser tracking and then to the stacked record layers, so the tracking signal is not affected by the thickness of stacked record layer. It can be used for existing optical disc drive without great modification.

Description

technical field [0001] The invention provides a rewritable multi-layer information storage medium, which can be applied to optical disks with four data recording layers on both sides and more than two data recording layers on one side, so as to greatly increase the recording capacity. Background technique [0002] With the advent of the information and multimedia era, the demand for storage media density and capacity is also increasing, especially for high-quality animation, video, sound and large-capacity data storage, which led to the birth of DVD, breaking through the 650MB capacity. CD format, which not only increases the recording capacity by 4 to 7 times, but also makes revolutionary progress in recording quality and functional performance. As far as re-readable optical storage media are concerned, they can generally be divided into phase-change and magnetic There are two types of optical types, among which the phase-change optical storage media does not require an ext...

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Problems solved by technology

[0007] 3. The laser light passes through the transparent protective layer 6 of 10-177 μm to reach the data recording layer, so it will not be accepted by the general CD-RW or rewritable DVD drive area

[0008] Another prior art disclosed in the SONY paper (ODS 2001 MB3) is that the second data recording layer 2b is plated on the second substrate 1b with a thickness of 1.1 mm on the second replica groove track surface 7b for laser tracking, and the The first data recording stack 2a is plated on the first replicated groove track surface 7a for laser tracking that is provided by another covering layer with a thickness of 87 μm. Finally, the second substrate 1b with

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