Patent ID: 7533848

Claim:
A tape reel for use with a single-reel magnetic cartridge of a servo tracking system in which signal recording and reproduction are performed while executing tracking control of a magnetic head array according to a servo signal recorded in advance along with a longitudinal direction of the magnetic tape, comprising: a cylindrical hub having a longitudinal axis and opposed first and second ends; and a first flange and a second flange extending radially outwardly from the first and second ends of the hub, respectively, so that a tape can be wound around the hub between the first and second flanges; the first flange having an inner surface opposing the second flange and an outer surface away from the second flange, the inner surface of the first flange serving as a reference position for receiving one longitudinal edge of the tape during a winding of the tape; the second flange having an inner surface opposing the first flange and an outer surface away from the first flange; the first flange having an average thickness larger than that of the second flange; the inner surface of the first flange being inclined outwardly from an inner peripheral end toward an outer peripheral end thereof so that an opposing distance between the opposed inner surfaces of the first and second flanges increases in proportion to a radial distance from the hub; the inner surface of the first flange having a plurality of recesses formed thereon, each of the recesses having a depth not smaller than 0.05mm and not greater than 0.40mm; and a total area of the recesses on the inner surface of the first flange occupying not lower than 30% and not higher than 80% of a total area of the inner surface of the first flange.