Patent ID: 6955317
Filing Date: 2005-10-18
Classification: G11B,Y10T

Abstract:
1. A recording tape cartridge comprising: a reel having a reel hub on which a recording tape is wound, and gear teeth are provided at an inner side of a floor portion of the reel hub; a case which accommodates the reel, and an engaging projection is formed at a surface of the case opposing the floor portion of the reel hub; a braking member having a disc, and a braking gear, which is annular and which can mesh with the gear teeth, is provided at one surface of the disc, and the braking member approaches and moves away from the floor portion of the reel hub within the case so as to be able to be positioned at a meshing position, at which the braking gear meshes with the gear teeth, and a released position at which a meshed state is released; and a groove wall portion standing erect at the disc and forming an insertion groove in which the engaging projection enters over an entire stroke of movement of the braking member, and the groove wall portion impedes rotation of the braking member with respect to the case, and guides the braking member in directions of approaching and moving away from the floor portion of the reel hub, wherein the disc has a through hole into which enters a distal end of the engaging projection which has entered into the insertion groove when the braking member is positioned at the released position.