Single-reel type tape cartridge

Abstract

In a single-reel type tape cartridge, a coupling portion of a leader tape includes a pair of winding pieces disposed at opposite sides of a cutout and each winding piece includes a base portion and a turnover portion wound around a pin of a leader member so as to be ultrasonically welded to the base portion. An anvil for supporting the coupling portion of the leader tape has a pair of anvil faces each having a width smaller than that of the turnover portion and ultrasonic welding of the turnover portion to the base portion is performed by supporting the coupling portion on the anvil faces. The turnover portion is divided into a completely welded area having a width substantially equal to that of each of the anvil faces and an incompletely welded area disposed outside each of opposite side edges of the completely welded area.

1 . A single-reel type tape cartridge comprising: 
 a leader tape which includes a coupling portion disposed at its leading edge;    a leader member which includes a pin; and    an anvil for supporting the coupling portion of the leader tape;    wherein the coupling portion is wound around the pin and turned over to the leader tape so as to be attached to the leader tape by ultrasonic welding and includes a pair of winding pieces spaced away from each other by an elongated cutout formed at a central portion of an end of the leader tape;    wherein each of the winding pieces includes a base portion disposed at its base end portion and a turnover portion wound around the pin and turned over to the base portion so as to be attached to the base portion by ultrasonic welding;    wherein the anvil has a pair of anvil faces each having a width smaller than that of the turnover portion and ultrasonic welding of the turnover portion to the base portion is performed by supporting the coupling portion on the anvil faces;    wherein a completely welded area having a width substantially equal to that of each of the anvil faces is formed from a center to a vicinity of opposite side edges of the turnover portion and an incompletely welded area is formed between each of opposite side edges of the completely welded area and each of the opposite side edges of the turnover portion.    
     
     
         2 . The single-reel type tape cartridge as claimed in  claim 1 , wherein the turnover portion is formed gradually smaller towards its distal end such that the incompletely welded area is formed gradually smaller towards its distal end along each of the opposite side edges of the turnover portion.  
     
     
         3 . The single-reel type tape cartridge as claimed in  claim 1 , wherein a width of the completely welded area is set at about 70% of a maximum width of the turnover portion.  
     
     
         4 . The single-reel type tape cartridge as claimed in  claim 2 , wherein a width of the completely welded area is set at about 70% of a maximum width of the turnover portion.