Multilayer information recording medium

Details Multilayer information recording medium Multilayer information recording medium

2011-04-19

2011-04-19

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

C369S284000

Reexamination Certificate

active

07929395

ABSTRACT:
A multilayer information storage medium according to the present invention includes: a substrate; at least three information storage layers, which are stacked one upon the other on the substrate; a plurality of transparent layers, each of which is arranged between its associated adjacent ones of the information storage layers; and a transparent coating layer. At least two of the transparent layers have mutually different thicknesses. If a laser beam with a wavelength of 400 nm to 410 nm is incident perpendicularly on the medium through the transparent coating layer, two of the information storage layers that sandwich the thinnest one of the transparent layers have a higher returning light intensity and/or a higher degree of modulation than the other information storage layers.

REFERENCES:
patent: 2004/0139459 (2004-07-01), Mishima et al.
patent: 2006/0062133 (2006-03-01), Tsukagoshi et al.
patent: 2007/0189147 (2007-08-01), Miyamoto et al.
patent: 2007/0242596 (2007-10-01), Ootera et al.
patent: 2004-213720 (2004-07-01), None
patent: 2005-285222 (2005-10-01), None
patent: 2006-040342 (2006-02-01), None
patent: 2006-073053 (2006-03-01), None
Form PCT/ISA/237 (Opinion of the Examiner) for corresponding Application No. PCT/JP2007/055866 dated Jun. 19, 2007 and a partial English translation.
International Search Report for corresponding Application No. PCT/JP2007/055866 dated Jun. 19, 2007.

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