Magnetic tape cartridge

Abstract

A magnetic tape cartridge includes a cartridge case, a single tape reel, and a tape leader pin. The cartridge case has a tape leader opening in the side wall thereof. The tape reel with magnetic tape wound thereon is rotatably housed within said cartridge case. The tape leader pin is firmly attached to the leading end of said magnetic tape and is detachably held near the tape leader opening by a spring member. The surface hardness of the sliding surface of the spring member with respect to said tape leader pin is made higher than that of the tape leader pin to prevent an increase in the sliding resistance between the sliding surface of the tape leader pin and the sliding surface of a leader-pin holding spring.

1 - 7 . (canceled)  
   
   
       8 . A magnetic tape cartridge comprising: 
 a cartridge case with a tape leader opening in a side wall;    a single tape reel having magnetic tape wound thereon rotatably housed within said cartridge case; and    a tape leader pin, firmly attached to a leading end of said magnetic tape, and detachably held near said tape leader opening by a spring member;    wherein at least either a sliding surface of said spring member or a sliding surface of said tape leader pin is subjected to a surface roughening process.    
   
   
       9 . The magnetic tape cartridge as set forth in  claim 8 , wherein the sliding surface subjected to said surface roughening process has a surface roughness of 0.5 to 3.0 μm in terms of 10-point mean roughness.  
   
   
       10 . A magnetic tape cartridge comprising: 
 a cartridge case with a tape leader opening in a side wall;    a single tape reel having magnetic tape sound thereon rotatably housed within said cartridge case; and    a tape leader pin, firmly attached to a leading end of said magnetic tape, and detachably held near said tape leader opening by a spring member comprising a plate spring;    wherein at least a sliding surface of said plate spring with respect to said tape leader pin is subjected to a surface striking process.