Magnetic tape with specific servo pattern edge shape and magnetic tape device using same
AssigneeFUJIFILM Corporation
InventorsNorihito Kasada, Tetsuya Kaneko
Life of this patent
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Abstract
The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the coercive force measured in the longitudinal direction of the magnetic tape is less than or equal to 167 kA/m, a timing-based servo pattern is present on the magnetic layer, and the edge shape specified by observing the timing-based servo pattern with a magnetic force microscope is a shape in which the difference between the value L99.9 of the 99.9% cumulative distribution function of the width of misalignment from the ideal shape in the longitudinal direction of the magnetic tape and the value L0.1 of the 0.1% cumulative distribution function, L99.9−L0.1, is less than or equal to 180 nm.
Claims20
A magnetic tape,
- which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein
- a coercive force measured in a longitudinal direction of the magnetic tape is less than or equal to 167 kA/m;
- a timing-based servo pattern is present on the magnetic layer;
- and
- an edge shape of a portion of a servo pattern specified by observing the timing-based servo pattern with a magnetic force microscope is a shape in which a difference between a value L99.9 of 99.9% cumulative distribution function of a width of misalignment from an ideal shape in the longitudinal direction of the magnetic tape and a value L0.1 of 0.1% cumulative distribution function, L99.9−L0.1, is less than or equal to 180 nm.
A magnetic tape device,
- which comprises a magnetic tape, a magnetic head, and a servo head, and
- wherein the magnetic tape is a magnetic tape, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein
- a coercive force measured in a longitudinal direction of the magnetic tape is less than or equal to 167 kA/m;
- a timing-based servo pattern is present on the magnetic layer;
- and
- an edge shape of a portion of a servo pattern specified by observing the timing-based servo pattern with a magnetic force microscope is a shape in which a difference between a value L99.9 of 99.9% cumulative distribution function of a width of misalignment from an ideal shape in the longitudinal direction of the magnetic tape and a value L0.1 of 0.1% cumulative distribution function, L99.9−L0.1, is less than or equal to 180 nm.
Dependencies are inferred from the claim text.