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US 11,482,249 B2Granted
Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
AssigneeFUJIFILM Corporation
InventorsNorihito Kasada, Yuto Murata, Yusuke Kaneko
Life of this patent
Estimating the term…
Abstract
A magnetic tape in which a minimum value of TDStens among five TDStens measured respectively at a temperature of 16° C. and a relative humidity of 20%, a temperature of 16° C. and a relative humidity of 80%, a temperature of 26° C. and a relative humidity of 80%, a temperature of 32° C. and a relative humidity of 20% and a temperature of 32° C. and a relative humidity of 55% is 1.43 μm/N or more, a ratio of a change of TDStens to a change of a relative humidity obtained from the five TDStens is 0.005 μm/N/% or less, and a ratio of a change of TDStens to a change of a temperature obtained from the five TDStens is 0.020 μm/N/° C. or less.
Claims19
A magnetic tape comprising:
- a non-magnetic support and a magnetic layer containing a ferromagnetic powder, wherein
- the magnetic layer has a plurality of servo bands, and a region sandwiched between two adjacent servo bands is called a data band,
- among five TDStens measured respectively in the following five environments;
- a temperature of 16° C. and a relative humidity of 20%,
- a temperature of 16° C. and a relative humidity of 80%,
- a temperature of 26° C. and a relative humidity of 80%,
- a temperature of 32° C. and a relative humidity of 20%, and
- a temperature of 32° C. and a relative humidity of 55%,
- a minimum value of the TDStens is 1.43 μm/N or more,
- where TDStens is a ratio of a change of a servo band interval to a change of a tension obtained from a plurality of servo band intervals measured by respectively applying a plurality of different tensions in a longitudinal direction of a magnetic tape as a value based on a magnetic tape with a ½ inch width and four total data bands,
- a ratio of a change of the TDStens to a change of the relative humidity, which is obtained from the five TDStens, is 0.005 μm/N/% or less, and
- a ratio of a change of the TDStens to a change of the temperature, which is obtained from the five TDStens, is 0.020 μm/N/° C. or less.
9 more elements
A magnetic tape cartridge, comprising a magnetic tape,
- wherein the magnetic tape comprises a non-magnetic support and a magnetic layer containing a ferromagnetic powder,
- the magnetic layer has a plurality of servo bands, and a region sandwiched between two adjacent servo bands is called a data band,
- among five TDStens measured respectively in the following five environments;
- a temperature of 16° C. and a relative humidity of 20%,
- a temperature of 16° C. and a relative humidity of 80%,
- a temperature of 26° C. and a relative humidity of 80%,
- a temperature of 32° C. and a relative humidity of 20%, and
- a temperature of 32° C. and a relative humidity of 55%,
- a minimum value of the TDStens is 1.43 μm/N or more,
- where TDStens is a ratio of a change of a servo band interval to a change of a tension obtained from a plurality of servo band intervals measured by respectively applying a plurality of different tensions in a longitudinal direction of a magnetic tape as a value based on a magnetic tape with a ½ inch width and four total data bands,
- a ratio of a change of the TDStens to a change of the relative humidity, which is obtained from the five TDStens, is 0.005 μm/N/% or less, and
- a ratio of a change of the TDStens to a change of the temperature, which is obtained from the five TDStens, is 0.020 μm/N/° C. or less.
9 more elements
A magnetic tape apparatus, comprising a magnetic tape cartridge,
- wherein the magnetic tape cartridge comprises a magnetic tape,
- the magnetic tape comprises a non-magnetic support and a magnetic layer containing a ferromagnetic powder, and
- the magnetic layer has a plurality of servo bands, and a region sandwiched between two adjacent servo bands is called a data band,
- among five TDStens measured respectively in the following five environments;
- a temperature of 16° C. and a relative humidity of 20%,
- a temperature of 16° C. and a relative humidity of 80%,
- a temperature of 26° C. and a relative humidity of 80%,
- a temperature of 32° C. and a relative humidity of 20%, and
- a temperature of 32° C. and a relative humidity of 55%,
- a minimum value of the TDStens is 1.43 μm/N or more,
- where TDStens is a ratio of a change of a servo band interval to a change of a tension obtained from a plurality of servo band intervals measured by respectively applying a plurality of different tensions in a longitudinal direction of a magnetic tape as a value based on a magnetic tape with a ½ inch width and four total data bands,
- a ratio of a change of the TDStens to a change of the relative humidity, which is obtained from the five TDStens, is 0.005 μm/N/% or less, and
- a ratio of a change of the TDStens to a change of the temperature, which is obtained from the five TDStens, is 0.020 μm/N/° C. or less.
10 more elements
Dependencies are inferred from the claim text.