Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2006-05-09
2006-05-09
Neyzari, Ali (Department: 2656)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C369S283000, C369S288000, C428S064400
Reexamination Certificate
active
07042831
ABSTRACT:
A phase-change optical information recording medium in which information can be recorded, reproduced and rewritten and which includes a first transparent substrate having a wobbling guide groove which is spirally formed thereon at a pitch; a first dielectric layer located overlying the first transparent substrate and having an optical thickness of from 80 nm to 200 nm; a phase-change recording layer located overlying the first dielectric layer and having an optical thickness of from 20 to 50 nm when the recording layer is in an erased state; a second dielectric layer located overlying the recording layer and having an optical thickness of from 10 nm to 70 nm; a reflection layer located overlying the second dielectric layer; optionally a third dielectric layer located between the second dielectric layer and the reflection layer; and a second transparent substrate located overlying the reflection layer.
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Communication pursuant to Article 96(2) EPC dated Sep. 30, 2005 in European Patent Application No. 02 250 766.9-2210, Ricoh Company, Ltd.
Ito Kazunori
Narumi Shinya
Onagi Nobuaki
Yamada Katsuyuki
Yuzurihara Hajime
Cooper & Dunham LLP
Neyzari Ali
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