Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2005-06-14
2005-06-14
Neyzari, Ali (Department: 2655)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C428S064400
Reexamination Certificate
active
06906994
ABSTRACT:
A disc having grooves and pits with different depths according toin-line-formulae description="In-line Formulae" end="lead"?λ/8n≦d3≦λ/5nin-line-formulae description="In-line Formulae" end="tail"?where d3is a difference in depths between the grooves and the pits, λ is the wavelength of a light source, and n is the refractive index of the disc. A disc having grooves and pits with different depths can be manufactured without etching by using at least two stampers. Manufacturing a master by depositing photoresist over a glass master, forming a first land region and a second land region having different depths by laser cutting with laser beams having different power levels. Stamping a father stamper having a groove region and a pit region from the master, the shape of the father stamper inverse of the master. Stamping a mother stamper from the father stamper, the shape of the mother stamper inverse of the father stamper. Manufacturing the disc with the mother stamper.
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Lee Kyung-geun
Park Chang-min
Park In-sik
Yoon Du-seop
Neyzari Ali
Stein, McEwen & Bui LLP
LandOfFree
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