Stock material or miscellaneous articles – Circular sheet or circular blank
Reissue Patent
2005-08-10
2008-10-28
Mulvaney, Elizabeth (Department: 1774)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064400, C430S270110
Reissue Patent
active
RE040556
ABSTRACT:
A multi-layer-information-recording medium is applied to an information recording and reproducing apparatus capable of recording or reproducing information on and from either of a single-layer-information-recording medium having a single recording layer on one side, and a multi-layer-information-recording layer having a plurality of recording layers layered on a spacer layer on one side as a change in reflectivity by irradiating a light beam. The multi-layer-information-recording medium is compatible in terms of at least reproducing and recording with a single-layer-information-recording medium having a cover layer having a predetermined refractive index “n” and a thickness “t” disposed on a recording layer on a light incident side surface. The multi-layer-information-recording medium includes a deepest recording layer deepest from the light incident side surface. The deepest recording layer is formed at an optical distance d1from the light incident side surface satisfying an equation d1=nt. The multi-layer-information-recording medium also includes at least one shallow recording layer formed at an optical distance d2satisfying an inequality d2<nt from the light incident side surface.
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Maeda Takanori
Ohsawa Seiichi
Finnegan Henderson Farabow Garrett & Dunner LLP
Mulvaney Elizabeth
Pioneer Corporation
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