Fujifilm Corporation

Yuto Murata

Norihito Kasada

Yusuke Kagawa

Yusuke Kaneko

Nagisa Yamasaki

Tomohide Ueyama

Shota Kamimura

The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. 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 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation σ of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.

Magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape apparatus

The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. The number of recesses existing on a surface of the magnetic layer and having an equivalent circle diameter of 0.15 μm or more and 0.25 μm or less is 100 or more and 2500 or less per an area of 40 μm×40 μm. Standard deviation σ of the number of the recesses in a width direction of the surface of the magnetic layer is 100 or less.

Magnetic tape with particular surface characteristics, magnetic tape cartridge, and magnetic tape apparatus

The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder, and the roundness of the trajectory of one rotation drawn by the magnetic tape in a case where the wound magnetic tape is pulled out from the core is 100 &#x3bc;m or less as the arithmetic mean of the measured values at three points in the width direction of the magnetic tape.

Magnetic tape container

The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A dimension change amount &#x394;w in a width direction with respect to a tension change in a longitudinal direction is 400 ppm/N to 900 ppm/N, the magnetic layer includes a plurality of servo bands, and a coefficient of variation CV calculated by Equation A: CV=(&#x3c3;G/&#x394;w)&#xd7;100 is 10% or less. The &#x3c3;G is a standard deviation of servo band intervals measured in a region of the magnetic tape over 100 m in the longitudinal direction with a tension of 0.6 N in the longitudinal direction. A magnetic tape container containing the magnetic tape.

Magnetic tape and magnetic tape container

The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A maximum value of a deviation of a center position of an average minimum region reference circle of a trajectory of one rotation drawn by the magnetic tape, in a case where the wound magnetic tape is drawn out from the core core is 100 &#x3bc;m or less for three points of the magnetic tape in a width direction.

A magnetic tape in which a minimum value of TDStens among five TDStens measured respectively at a temperature of 16&#xb0; C. and a relative humidity of 20%, a temperature of 16&#xb0; C. and a relative humidity of 80%, a temperature of 26&#xb0; C. and a relative humidity of 80%, a temperature of 32&#xb0; C. and a relative humidity of 20% and a temperature of 32&#xb0; C. and a relative humidity of 55% is 1.43 &#x3bc;m/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 &#x3bc;m/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 &#x3bc;m/N/&#xb0; C. or less.

Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus

The magnetic tape satisfies TDSage+TDSenv&#x2212;TC&#x2264;0.30 &#x3bc;m. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by &#xbd;, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.

Magnetic tape having controlled dimensions, magnetic tape cartridge, and magnetic tape apparatus

A magnetic tape device, a magnetic tape, and a magnetic tape cartridge, in which the magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, the magnetic tape after running in a state where the tension is applied is wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction, and a center line average roughness Ra measured regarding a surface of a back coating layer of the magnetic tape with an atomic force microscope is in a range of 5 to 13 nm.

Magnetic tape device, magnetic tape, and magnetic tape cartridge

In the probability distribution calculated from TDSage, TDSenv, and TC, the magnetic tape has the probability Pof equal to or less than 0.2%, in which the absolute value of &#x394;SB exceeds 0.3 &#x3bc;m. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by &#xbd;, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.

Magnetic tape with characterized servo bands, magnetic tape cartridge, and magnetic tape apparatus

In the magnetic tape cartridge, a tape has a tape thickness of 5.3 &#x3bc;m or less, and a difference W&#x2212;Wbetween a tape width Wat a position of 50 m&#xb1;1 m from a tape inner end and a tape width Wat a position of 50 m&#xb1;1 m from a tape outer end is 4.1 &#x3bc;m to 19.9 &#x3bc;m as a value measured on 100th day from a date of magnetic tape cartridge manufacture, and a difference G&#x2212;Gbetween a servo band interval Gin a range of 49 m to 51 m from the tape inner end and a servo band interval Gin a range of 49 m to 51 m from the tape outer end is &#x2212;3.9 &#x3bc;m to 0.0 &#x3bc;m as a value measured on 100th day from the date of magnetic tape cartridge manufacture.

Single reel magnetic tape cartridge with predefined tape width difference and servo band interval difference

Provided is a magnetic tape cartridge of a single reel type in which a magnetic tape is wound around a reel, in which the magnetic tape includes a non-magnetic support and a magnetic layer containing a ferromagnetic powder, and has a tape thickness of 5.3 &#x3bc;m or less, the magnetic layer includes a plurality of servo bands, and a difference (G&#x2212;G) between a servo band interval Gin a range of 49 m to 51 m from a tape inner end and a servo band interval Gin a range of 49 m to 51 m from a tape outer end is &#x2212;3.9 &#x3bc;m to &#x2212;1.1 &#x3bc;m as a value measured on 100th day from a date of magnetic tape cartridge manufacture.

Single reel magnetic tape cartridge with predefined servo band interval difference

Provided is a magnetic tape cartridge of a single reel type in which a magnetic tape is wound around a reel, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, a tape thickness is equal to or smaller than 5.2 &#x3bc;m, a tape width difference (B&#x2212;A) between a tape width A at a position of 10 m&#xb1;1 m from a tape outer end and a tape width B at a position of 50 m&#xb1;1 m from a tape inner end is 2.4 &#x3bc;m to 12.0 &#x3bc;m, and the tape width A and the tape width B are values measured 100 days from the date of magnetic tape cartridge manufacture.

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Minami-ashigara, Japan

Yuto Murata