Patent ID: 7108215
Filing Date: 2006-09-19
Classification: G11B

Abstract:
1. A magnetic tape cartridge, comprising: a tape reel on which magnetic tape is wound on an outer peripheral surface of a reel hub thereof, rotatably housed inside of a cartridge case; and a reel lock member, for inhibiting rotation of said tape reel, provided movably in an axial direction of said tape reel between a lock position and a lock release position, provided inside of said reel hub, wherein a position restriction rib, opposed to an outer peripheral surface of said reel lock member, for restricting an axial deviation of said reel lock member from an axial position of said tape reel, is formed discontinuously with an inner peripheral surface of said reel hub on a top surface of a bottom of said reel hub, provided inside of said reel hub, wherein the position restriction rib has a cross-sectional area and a side surface shape with sufficient strength to withstand impact applied from said tape reel, wherein the position restriction rib extends to a height position opposing the outer peripheral surface of said reel lock member which is located at said lock release position, and wherein the position restriction rib is formed independently from the inner peripheral surface of said reel hub, whereby molding defects are prevented from occurring on the outer peripheral surface of said reel hub at location corresponding to formation position of the position restriction rib.