Patent ID: 8564907
Filing Date: 2013-10-22
Classification: G11B

Abstract:
1. A magnetic tape cartridge comprising: a cartridge case; a pair of cylindrical hubs rotatably provided in the cartridge case; and a magnetic tape laid between the hubs and wound around outer peripheries of the hubs, wherein each of the hubs has an inner diameter portion provided with a height-position determining member, the height-position determining member determines a height position of the hub in the magnetic tape cartridge by contacting an inserted portion of a driving shaft inserted in the hub when the magnetic tape cartridge is mounted in a magnetic recording and reproducing apparatus, and the height-position determining member includes a magnetic member that has a flat face without a downward extending flange, the flat face exposed in a contact portion of the magnetic member, the contact portion extending substantially across a full width of the inserted portion of the driving shaft, to make tight contact with substantially the full width of the inserted portion of the driving shaft such that the inserted portion of the driving shaft structurally affects the magnetic tape cartridge by regulating displacement of the height-position determining member upon said tight contact with the flat face of the magnetic member.