Disk cartridge having chamfered wall portion

摘要

A disk cartridge with a case comprises upper and lower shell halves, each of which has a head insertion hole and a spindle insertion hole. A pair of projections are provided inwardly at a joint portion between the two holes. The peripheral wall portions of the spindle insertion hole are extended inwardly toward tips of the projections in an arched form. An almost annular projection is provided along a periphery of the spindle insertion hole to increase a supporting portion for supporting the disk when the spindle is taken off from the spindle insertion hole. The inner peripheral walls of the head insertion hole are chamfered. A corner of the groove is chamfered to prevent the corner of the groove from being caught by a part of the guide frame.