Optical recording medium

Details Optical recording medium Optical recording medium

2011-08-30

2011-08-30

Blouin, Mark (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Layered

Reexamination Certificate

active

08009548

ABSTRACT:
An optical recording medium of improved recording and reading characteristics, having both a read-only information recording layer and an information recording layer. The optical recording medium includes information recording layers capable of recording and reading by irradiation of laser light having a wavelength λ of 400 to 410 nm through an optical system having a numerical aperture NA of 0.8 to 0.9. In this medium, the information recording layers include at least a read-only information layer having information recorded in advance and an information recording layer different from the read-only information recording layer, the read-only information recording layer being capable of information recording of write-once type or rewritable type. The read-only information recording layer is stacked closest to a light incident surface of the laser light.

REFERENCES:
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patent: 7321481 (2008-01-01), Inoue et al.
patent: 7864638 (2011-01-01), Watanabe et al.
patent: 2005/0248881 (2005-11-01), Hayashida et al.
patent: 2002304730 (2002-10-01), None
patent: 2006155859 (2006-06-01), None
Ichimura et al., “Proposal for a Multilayer Read-only-memory Optical Disk Structure”, Applied Optics 45 (8):1794-1803 (2006).
Mishimura et al., “150 GB, 6-layer Write Once Disc for Blu-ray Disc System”, SPIE 6282:628201-1-11 (2006).

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