Patent ID: 7063287
Filing Date: 2006-06-20
Classification: G11B

Abstract:
1. A magnetic tape cartridge comprising: a cartridge case in which a single reel with magnetic tape wound thereon is rotatably housed and a leader pin coupled with a leading end of said magnetic tape is caught by a pin catching member of a recording-reproducing unit and is inserted into a tape leader opening formed in said cartridge case, said cartridge case having a floor surface with a first recess such that a portion of said leader pin is disposed within said first recess; and a pin retaining spring member which elastically engages said leader pin so that said leader pin is detachably retained at a predetermined position within said cartridge case; wherein a second recess is provided in said floor surface of said cartridge case such that said pin retaining spring member resides in said second recess, said second recess including a wall surface so that when said leader pin is inserted into said cartridge case, displacement of said pin retaining spring member due to the engagement of said pin retaining spring member with said leader pin is regulated within a predetermined range, wherein said pin retaining spring member has an elastic arm portion that is displaced by said leader pin, and said wall surface being positioned such that said elastic arm portion is abutted against said wall surface in a first position and is separated from said wall surface in a second position, and wherein said wall surface is slanted with respect to an outer side wall of said cartridge and extends in a linear direction along said elastic arm portion for a distance which is greater than an outer diameter of said leader pin.