Magnetic disc cartridge

Claim 1

A magnetic disc cartridge adapted for use with a magnetic disc drive apparatus having a housing to receive said cartridge, a read-write head and a shutter actuation pin, said magnetic disc cartridge comprising a magnetic disc, a pair of upper and lower case members, superimposed one upon the other, to define a generally flat case for accomodating said magnetic disc therein, said case having a center axis and a peripheral wall, said upper and lower case members having peripheral edges which form said peripheral wall, with a seam line formed between said case members and upon said peripheral wall when said case members are superimposed one upon the other, a means for defining an aperture in said case between said center axis and said peripheral wall for access of said read-write head to said magnetic disc, a shutter moveably mounted on said case and engageable with said shutter actuation pin to move between a first position in which said shutter closes said aperture and a second position in which said shutter opens said aperture, and a means for defining a groove on said peripheral wall of said case, said groove extending through the case in parallel to said center axis to receive said shutter actuation pin when said shutter is in said second position, wherein said means for defining said groove comprises a cut-out section in one of said case members along the peripheral edge thereof, and a wall member defining said groove and extending integrally from the other of the upper and lower case members along the peripheral edge thereof, said wall member extending into said cut-out section so that said groove contains no seam line, whereby catching of said shutter actuation pin upon said seam line is precluded.