Patent ID: 6869037
Filing Date: 2005-03-22
Classification: G11B

Abstract:
1. A recording tape cartridge in combination with a drive device, the combination comprising: a case in which a single reel is accommodated, the reel including a hub which has an upper flange portion and a lower flange portion at an upper end portion and a lower end portion thereof respectively and on which a recording tape is wound; a gear for rotating the reel, which is provided at a central portion of a lower surface of the reel and meshed with a driving gear of the drive device at only planes substantially orthogonal to radial directions of the reel; and a reference portion, which is provided at the lower surface of the reel, for positioning the reel in an axial direction of the reel by abutting on a portion for positioning of the drive device, wherein the reference portion comprises a plurality of convex portions protruding from the lower surface of the reel.