Information recording medium with concave/convex servo...

Details Information recording medium with concave/convex servo... Information recording medium with concave/convex servo...

2005-08-31

2009-06-30

Renner, Craig A. (Department: 2627)

Dynamic magnetic information storage or retrieval

Record medium

Disk

C360S048000, C360S077080

Reexamination Certificate

active

07554768

ABSTRACT:
On an information recording medium, a data track pattern and a servo pattern composed of a concave/convex pattern including a plurality of convex parts are formed on at least one surface of a substrate and respective concave parts in the concave/convex pattern are filled with non-magnetic material. In the concave/convex pattern that constructs the data track pattern, the respective convex parts are formed concentrically or in a spiral. In the concave/convex pattern that constructs the servo pattern, a unit convex part length along a direction of rotation of the substrate is set so that a value produced by dividing the unit convex part length by a distance from a center of the data track pattern decreases from an inner periphery to an outer periphery.

REFERENCES:
patent: 6014296 (2000-01-01), Ichihara et al.
patent: 6118604 (2000-09-01), Duffy
patent: 6324032 (2001-11-01), Ohtsuka et al.
patent: 2005/0045583 (2005-03-01), Fujita et al.
patent: 2005/0117253 (2005-06-01), Moriya et al.
patent: 2006/0066975 (2006-03-01), Soeno et al.
patent: 09-097419 (1997-04-01), None
patent: 2000-020945 (2000-01-01), None
U.S. Appl. No. 11/085,522 to Takai et al., which was filed on Mar. 22, 2005.
U.S. Appl. No. 11/214,813 to Soeno et al., which was filed on Aug. 31, 2005.
U.S. Appl. No. 11/225,185 to Moriya et al., which was filed on Sep. 14, 2005.
U.S. Appl. No. 11/229,650 to Soeno et al., which was filed on Sep. 20, 2005.
English language Abstract of JP09-097419.
English language Abstract of JP2000-020945.

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