Magnetic recording disk cartridge

摘要

A magnetic recording disk cartridge comprises a recording disk and a casing for accommodating the recording disk. The casing is provided with a pair of magnetic head receiving openings in the front and rear side walls thereof. The magnetic head receiving openings are normally closed and are opened when the cartridge is loaded in a recording-reproducing system. The shutter member for closing the magnetic head receiving openings is formed by bending a single plate material and comprises a pair of arm portions connected with each other by a bight portion. A pair of shutter portions for closing the respective magnetic head receiving openings are formed on the respective arm portions at an intermediate portion thereof. The free end portions of the arm portions respectively form bearing portions which are engaged with engaging ribs projecting inwardly from the front and rear side walls of the casing and support the shutter member for rotation about the ribs. The shutter member is connected to one end of a connecting member at the bight portion. The other end of the connecting member is exposed outside the casing to abut against an abutment member of the recording-reproducing system when the cartridge is loaded therein. The shutter member is normally held in an operative position in which the shutter portions close the magnetic head receiving openings, and is drawn by the connecting member whereby it is rotated to an inoperative position in which the shutter portions open the magnetic head receiving openings when the cartridge is loaded in the recording-reproducing system.