Dynamic information storage or retrieval – Specific detail of information handling portion of system – Electrical modification or sensing of storage medium
Reexamination Certificate
2008-01-01
2008-01-01
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Electrical modification or sensing of storage medium
Reexamination Certificate
active
07315506
ABSTRACT:
An optical disk from which information is played back when the optical disk is irradiated with a playback light beam which does not pass through a photochromic layer before its transparency is changed by irradiation with a recording light beam, but passes through the photochromic layer after its transparency is changed, including: the photochromic layer which is initialized with initialization light and also maintains a change in its transparency caused by irradiation with a recording light beam after end of the irradiation; and a fluorescent layer for emitting, as detection light, light of a frequency different from the frequency of the playback light beam when the fluorescent layer is irradiated with the playback light beam, wherein the photochromic layer and the fluorescent layer are formed in order in the direction in which the recording light beam and the playback light beam are irradiated.
REFERENCES:
patent: 4927681 (1990-05-01), Chikuma
patent: 5063556 (1991-11-01), Chikuma
patent: 6309729 (2001-10-01), Glushko et al.
patent: 6515956 (2003-02-01), Tamada
patent: 2-50328 (1990-02-01), None
patent: 7-72567 (1995-03-01), None
Hindi Nabil
Pioneer Corporation
Sughrue Mion Pllc.
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