US 11,735,213 B2
Magnetic tape device
Norihito Kasada, Minamiashigara (JP); and Atsushi Musha, Minamiashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jul. 25, 2022, as Appl. No. 17/872,566.
Claims priority of application No. 2021-121711 (JP), filed on Jul. 26, 2021.
Prior Publication US 2023/0045648 A1, Feb. 9, 2023
Int. Cl. G11B 5/592 (2006.01); G11B 5/73 (2006.01); G11B 5/008 (2006.01)
CPC G11B 5/5926 (2013.01) [G11B 5/00813 (2013.01); G11B 5/739 (2019.05)] 14 Claims
OG exemplary drawing
 
1. A magnetic tape device comprising:
a magnetic tape; and a magnetic head,
wherein the magnetic head includes a module including an element array including a plurality of magnetic head elements between a pair of servo signal reading elements,
the magnetic tape device changes an angle θ formed by an axis of the element array with respect to a width direction of the magnetic tape during running of the magnetic tape in the magnetic tape device,
the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder,
the magnetic layer includes a plurality of servo bands,
Equation 1 below is satisfied,
TDSage+TDSenv−TC≤0.10 μm,  (Equation 1)
in Equation 1,
the TDSage is a maximum value of an absolute value of a difference between a servo band spacing obtained before storage for 24 hours in an environment of a temperature 60° C. and relative humidity of 20% and a servo band spacing obtained after the storage, and a unit is μm,
the TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of servo band spacings obtained in each of the following five environments of
a temperature of 16° C. and relative humidity of 20%,
a temperature of 16° C. and relative humidity of 80%,
a temperature of 26° C. and relative humidity of 80%,
a temperature of 32° C. and relative humidity of 20%, and
a temperature of 32° C. and relative humidity of 55%,
by ½, and a unit is μm, and
the TC is a value calculated by
TC=L{cos(θinitial−Δθ)−cos(θinitial+Δθ)},
a unit is μm,
the L is a distance between the pair of servo signal reading elements and a unit is μm, and
in a case where the angle θ at start of the running of the magnetic tape is defined as θinitial,
a maximum value of the angle θ during the running of the magnetic tape is defined as θmax, and a minimum value thereof is defined as θmin, and
the Δθ is a greater value between values calculated by
Δθmax=θmax−θinitial and
Δθmin=θinitial−θmin.