Recording tape cartridge

摘要

A recording tape cartridge capable of keeping position error signals during running of a recording tape small. A recording tape cartridge is provided with a reel hub, a magnetic tape that is wound round the reel hub, and a lower flange and upper flange that are disposed to oppose one another at each of the both axial direction ends of the reel hub. In a state in which the magnetic tape is completely wound on the reel hub, the magnetic tape is offset toward the upper flange. A space of an edge clearance between a lower end of an outermost periphery portion of the magnetic tape and the lower flange is at least 0.18 mm and at most 0.46 mm. A rate of widening of a facing distance between the lower flange and the upper flange increases toward the outer periphery side.

主权项

1. A recording tape cartridge comprising:
a hub; a recording tape that is wound around the hub; and a pair of flanges, the respective flanges being provided to face one another at either end in an axial direction of the hub, a clearance in the axial direction between an outermost peripheral portion of the recording tape and one of the flanges in a state in which the recording tape is completely wound around the hub being from 0.18 mm to 0.46 mm, a facing distance between the flanges being wider at an outer peripheral side of the flanges than at an inner peripheral side of the flanges, and a rate of widening of the facing distance between the flanges continuously increasing toward the outer peripheral side of the flanges from an outer periphery face of the hub to a position near the outer peripheral side of the flanges in a radial direction of the flanges, wherein the rate of widening of the facing distance between the flanges is an amount of change of the facing distance between the flanges per unit amount of a distance from the inner peripheral side of the flanges in the radial direction to the outer peripheral side of the flanges in the radial direction.