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US 12,424,244 B2Granted
Magnetic tape having characterized dark regions on magnetic layer, magnetic tape cartridge, and magnetic tape apparatus
AssigneeFUJIFILM Corporation
InventorYujin Shibata
Life of this patent
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Abstract
The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 2 kV, the number of dark regions having an equivalent circle diameter of 75 nm or more and less than 125 nm is 20 or more and 1500 or less, and standard deviation σ of the number of the dark regions in a width direction of the surface of the magnetic layer is 400 or less.
Claims16
A magnetic tape comprising:
- a non-magnetic support;
- and
- a magnetic layer containing a ferromagnetic powder,
- wherein, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 2 kV, a number of dark regions having an equivalent circle diameter of 75 nm or more and less than 125 nm is 20 or more and 1500 or less, and
- standard deviation a of the number of the dark regions in a width direction of the surface of the magnetic layer is 400 or less.
2 more elements
Dependencies are inferred from the claim text.