Dynamic optical information storage or retrieval – Optical storage medium structure – Disk hub
Reexamination Certificate
2005-03-08
2005-03-08
Chen, Tianjie (Department: 2652)
Dynamic optical information storage or retrieval
Optical storage medium structure
Disk hub
Reexamination Certificate
active
06865745
ABSTRACT:
An improved optical disc is provided that comprises a substantially transparent substrate, one surface of which carries optical data structures comprising pits and lands radially outward of a clamp area of the disc. In the clamp area a protrusion structure is provided above the first surface to create a clamp thickness greater than the thickness of the rest of the disc. In accordance with the principles of the present invention, only a portion of the clamp area is covered by the protrusions, which emulate a disc having a clamp area of greater thickness. In order to reduce warping caused by shrinkage of material added to the clamp area, the amount of material used to form the protrusions is less than 5% of the amount of material used to form the rest of the clamp area.
REFERENCES:
patent: 2846230 (1958-08-01), Richter
patent: 3132866 (1964-05-01), Nitti et al.
patent: 4359750 (1982-11-01), Howe
patent: 4633458 (1986-12-01), Tiefensee
patent: 4733388 (1988-03-01), Fujimoto et al.
patent: 5590115 (1996-12-01), Kubo
patent: 5875171 (1999-02-01), Albrecht et al.
patent: 5935673 (1999-08-01), Mueller
patent: 5999513 (1999-12-01), Arakawa et al.
patent: 6195234 (2001-02-01), Sundaram et al.
patent: 20020075794 (2002-06-01), Park
patent: 1291874 (2003-03-01), None
patent: 62248180 (1987-10-01), None
patent: 02-083834 (1990-03-01), None
patent: 07065472 (1995-03-01), None
patent: 09017037 (1997-01-01), None
patent: 10-106044 (1998-04-01), None
patent: WO 9810418 (1998-03-01), None
patent: WO 9847140 (1998-10-01), None
Chen Tianjie
Fish & Neave IP Group of Ropes & Gray LLP
Jackson Robert R.
WEA Manufacturing Inc.
Zhang Patrick J.
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