Optical disc having gas flow spoiler and the method for...

Details Optical disc having gas flow spoiler and the method for... Optical disc having gas flow spoiler and the method for...

2011-08-23

2011-08-23

Pham, Ly D (Department: 2827)

Dynamic optical information storage or retrieval

Optical storage medium structure

C427S162000

Reexamination Certificate

active

08006257

ABSTRACT:
An optical disc includes a round opening at the center of the optical disc, an annular recording section configured to record information, an annular supporting section between the round opening and the annular recording section and configured to support the optical disc, and a spoiler provided on a non-read/write side of the annular recording section and configured to disturb the flow field inside the optical disc drive when the optical disc is rotating, the spoiler having a centerline average roughness between 2 μm and 10 μm, a thickness between 0.02 mm and 0.05 mm, an area occupying at least 5% of the non-read/write side. The flow field so disturbed changes from a laminar state to a turbulent state and thus the read/write characteristics of the disc is improved due to lower air resistance experienced by the rotating disc.

REFERENCES:
patent: 5212679 (1993-05-01), Tohkairin
patent: 5504646 (1996-04-01), Tanaka et al.
patent: 5673156 (1997-09-01), Chen et al.
patent: 5987003 (1999-11-01), Yokota
patent: 2003/0039201 (2003-02-01), Fujii et al.
patent: 2005/0220991 (2005-10-01), Aoyama et al.

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