Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2004-08-06
2008-09-09
Neyzari, Ali (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S283000, C428S064400, C204S192320
Reexamination Certificate
active
07423957
ABSTRACT:
The present invention provides an optical information recording medium of excellent signal quality in high density recording onto a semitransparent information layer, its manufacturing method and a manufacturing apparatus. The optical information recording medium of the present invention includes at least a semitransparent information layer disposed between a circular transparent substrate and a protective substrate, in which the information layer has spiral grooves for guiding a light beam, and also includes a recording film capable of recording/reproducing information thereon/therefrom by changing at least in two states detectable optically by irradiation of the light beam from the transparent substrate side, and the difference in film thickness of slope portions of the inner circumferential side and outer circumferential side of the groove is within ±10% in the entire region for recording/reproducing information.
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Kitaura Hideki
Kojima Rie
Kusada Hideo
Nagata Ken'ichi
Nishiuchi Ken'ichi
Matsushita Electric - Industrial Co., Ltd.
Neyzari Ali
Wenderoth , Lind & Ponack, L.L.P.
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