Magnetic tape reel

Abstract

In magnetic tape reel having a cylindrical reel hub around which a magnetic tape is wound, and upper and lower flanges respectively extending radially outward from outer peripheries of upper and lower ends of the reel hub, when the reel hub and the lower flange are integrally molded of a magnetic resin material containing carbon fibers, a thickness t of a peripheral wall of the reel hub and a thickness t′ of the lower flange to be integrally molded with the reel hub are selected to satisfy the relationship given by 0.8t≦t′≦1.2t.

1 . A magnetic tape reel comprising: 
 a cylindrical reel hub around which a magnetic tape is wound; and    upper and lower flanges respectively extending radially outward from outer peripheries of upper and lower ends of the reel hub,    wherein when the reel hub and one of the upper and lower flanges are integrally molded of a magnetic resin material containing carbon fibers, a thickness t of a peripheral wall of the reel hub and a thickness t′ of one of the flanges to be integrally molded with the reel hub are selected to satisfy the relationship given by 0.8t≦t′≦1.2t.    
     
     
         2 . The magnetic tape reel according to  claim 1 , wherein the thickness t and the thickness t′ are selected to satisfy the relationship given by 0.8t≦t′≦1t.  
     
     
         3 . The magnetic tape reel according to  claim 1 , wherein the synthetic resin material is essentially consisting of a polycarbonate resin containing at least 5% of carbonate fibers.  
     
     
         4 . The magnetic tape reel according to  claim 2 , wherein the synthetic resin material is essentially consisting of a polycarbonate resin containing at least 5% of carbonate fibers.