Information recording medium having substrate with...

Dynamic information storage or retrieval – Storage medium structure – Optical track structure

Reexamination Certificate

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C369S275300, C369S044130

Reexamination Certificate

active

07139236

ABSTRACT:
A recording medium includes a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substrate. A recording layer is formed on the microscopic pattern and a light transmitting layer has a thickness of 0.05 mm to 0.12 mm formed on the recording layer. The microscopic pattern satisfies a relation of P≦λ/NA, wherein P is a pitch of the convex shaped section, λ is a wavelength of a reproducing light beam and NA is a numerical aperture of an objective lens. The microscopic pattern also includes modulated address information formed on both side walls of the convex shaped section viewed from the light transmitting layer as a wobble, both the side walls being parallel to each other, and furthermore wherein the address information is modulated by the phase-shift keying modulation system. A reproducing apparatus is particularly suited for the recording medium.

REFERENCES:
patent: 6097695 (2000-08-01), Kobayashi
patent: 6128273 (2000-10-01), Horie et al.
patent: 6160776 (2000-12-01), Seo
patent: 6195325 (2001-02-01), Okanishi
patent: 6256282 (2001-07-01), Yamagami et al.
patent: 6693873 (2004-02-01), Kondo et al.
patent: 02-247818 (1990-10-01), None
Warner Advanced Media Operations (WAMO) DVD, obtained on Jun. 28, 1999, “DVD 18 Requirements”, “Process Fundamentals”, “DVD 14/18 First Generation Equipment”, Manufacturing Considerations for DVD 14/18.
Hayashi et al., Matsushita Electric Industrial Co., Ltd., International Symposium on Optical Memory 2001, Oct. 2001, “New Replication Process Using Function-Assigned Resins for Dual-Layered Disk With 0.1 mm-Thick Cover Layer”.

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