Information recording medium, recording/reproducing apparatus, and stamper

Abstract

An information records medium is disclosed. Utilizing a concave-convex graphics which has a plurality of convex portions, a data track graphics and a servo graphics are formed on at least one side of a backing, and a non-magnetic material is embedded in every concave portion of the concave-convex graphics to comprise the concave-convex graphics of the data track graphics, and every convex portion forms concentric circle shape or twist to comprise the concave-convex graphics of the servo graphics, which is divided to form a plurality of annular sections (A1a- A4a) which have the same center of circle with the data track graphics, and aiming at the annular sections (A1a- A4a), an unit convex portion length is prescribed as that average length of the unit convex portion along direction of rotation which is R direction of arrow on every annular section (A1a- A4a) divides the distance from the center (O) of the data track graphics to the annular sections to obtain the value which is smaller from the annular section of the inner circumference side to the annular section of peripheral side. The invention is capable of providing the information records medium which has good equality on the whole areas from the inner circumference side to peripheral side.

Description

technical field [0001] The present invention relates to an information recording medium in which a data track pattern and a servo pattern are formed using a concave-convex pattern, and a non-magnetic material is embedded in each concave portion of the concave-convex pattern, a recording and reproducing device having the information recording medium, and a magnetic disk for manufacturing the information recording medium Master model. Background technique [0002] As a recording and reproducing apparatus having such an information recording medium, Japanese Patent Application Laid-Open No. 9-97419 discloses a magnetic recording apparatus having a disc type magnetic disk. In this case, in the magnetic disk, concentric recording tracks (strip-shaped protrusions) are formed by a recording magnetic member (magnetic material) on one side of a glass disk substrate (substrate). A guard band member (non-magnetic material) for improving the flatness of the magnetic disk and magnetical...

AI Technical Summary

Problems solved by technology

In this case, since it takes a certain amount of time to draw the exposure pattern, it becomes difficult to form a protective layer pattern (mask) for etching the recording magnetic layer in a short time.

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