Optical recording medium

Details Optical recording medium Optical recording medium

2007-08-20

2010-10-19

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S275200, C428S064100

Reexamination Certificate

active

07817526

ABSTRACT:
An optical recording medium has a five-layer structure including five recording layers, namely an L0layer, an L1layer, an L2layer, an L3layer, and an L4layer in this order from a side farthest away from a laser light incident surface. The materials of the respective recording layers are selected so that the rate of change in transmittance Tb/Ta as taken from the laser light incident surface satisfies 0.93<Tb/Ta<1.07 when recording on the L0layer among the recording layers, where: Ta is transmittance of laser light to reach the L0layer when the L0layer is irradiated with the laser light of optimum recording power after recording marks are formed on all the recording layers closer to the laser light incident surface (being the L1to L4layers); and Tb is transmittance of laser light to reach the L0layer when the L0layer is irradiated with the laser light of optimum recording power with no recording mark formed on any of the recording layers closer to the laser light incident surface.

REFERENCES:
patent: 2004/0191683 (2004-09-01), Nishihara et al.
patent: 2006/0222810 (2006-10-01), Hayashi et al.
patent: A 2004-213720 (2004-07-01), None
Kitaura, Hideki et al., “Multi-Layer Write-Once Media With Te-O-Pd Films Utilizing a Violet Laser,” Optical Data Storage 2001, Proceedings of SPIE, vol. 4342, pp. 340-347, Apr. 2001.
Mishima, Koji et al., “150 GB, 6-Layer Write Once Disc for Blu-Ray Disc System,” Optical Data Storage 2006, Proceedings of SPIE, vol. 6282, pp. 628201-01-628201-11, Apr. 2006.

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