Dynamic information storage or retrieval – Storage medium structure – Layered
Reexamination Certificate
2006-08-11
2008-12-09
Ortiz Criado, Jorge L (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Layered
C369S044270, C369S044370, C369S094000, C369S275200
Reexamination Certificate
active
07463575
ABSTRACT:
An optical information recording medium includes a plurality of recording layers, a reflectance of at least one of the plurality of the recording layers in a non-initialized state with respect to a light beam for initialization being smaller than a reflectance of the same in an initialized state with respect to the light beam for initialization. The recording layers are initialized by irradiating, among the plurality of recording layers, the recording layer positioned farther from a light beam irradiation side with the light beam prior to irradiating the recording layer positioned closer to the light beam irradiation side, so that the initialized recording layers have no initialization irregularities. In initialization, at a position at a same distance in a radial direction on the optical information recording medium, the recording layer positioned farther from a light beam irradiation side is irradiated with one light beam before the recording layer positioned closer to the light beam irradiation side is irradiated with another light beam so that the plurality of recording layers are initialized at the same time by a light beam projecting operation in which the light beams are focused at different positions. This ensures the initialization without irregularities within a short time.
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Akiyama Tetsuya
Miyagawa Naoyasu
Nishihara Takashi
Nishiuchi Ken'ichi
Criado Jorge L Ortiz
Hamre Schumann Mueller & Larson P.C.
Panasonic Corporation
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