Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2006-04-11
2006-04-11
Psitos, A M (Department: 2656)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S047470
Reexamination Certificate
active
07027371
ABSTRACT:
In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2–1.4 m/s, modulation m11of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60–80%. A topmost level Rtopof reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15–25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less. Recording at 8-times or higher velocities is thereby realized without any risk of impairing the read-compatibility with the conventional CD-RW specifications at least at 4-times velocity.
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CD-Rom Professional published in the United States, Sep. 19996, Hugh Bennett, pp. 29-44.
“CD-erasable (CD-E) with Ag-In-Sb-Te Phase Change Recording Material” by Y. Kageyama, et al of R&D Group, Ricoh Co., Ltd. (Assembly of Manuscripts for Phase-Change Optical Recording Symposium, Nov. 30-Dec. 1, 1995, pp. 41-45).
Horie Michikazu
Kubo Masae
Nobukuni Natsuko
Ohno Takashi
Katten Muchin & Rosenman LLP
Mitsubishi Chemical Corporation
Psitos A M
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