Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2008-09-25
2010-10-26
Feild, Joseph H (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
Reexamination Certificate
active
07821909
ABSTRACT:
An optical recording medium includes a main-information area in which a metal reflection film is formed on a substrate where a row of pits is formed as main data, and a sub-information area in which is recorded medium identification information, which is used to identify the optical recording medium individually, by removing the metal reflection film partially and forming a plurality of reflection-film removed areas. Information is reproduced by irradiating the metal reflection film with a beam of light. In the sub-information area, a row of pits or a guide groove is formed on the substrate, and a track pitch of the row of pits or the guide groove is at least 0.24 μm wide and at most 0.45 μm wide.
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Abe Shinya
Kawaguchi Yuko
Ohno Eiji
Tomiyama Morio
Feild Joseph H
Heyi Henok G
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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