| 摘要 |
<p>A magnetic disc cartridge having a jacket which contains a rotatable magnetic disc is loaded into a cartrige holder of recording and/or reproducing apparatus for recording and/or reproducing signals on the rotatable magnetic disc; the cartridge being comprised of a guide groove longitudinally extending in a direction in which the cartridge is inserted into the holder for receiving a guide element provided in the holder ; a shutter movable across a window provided in the jacket between a closed position and an opened position, the shutter may have a projection extending into the guide groove to be contacted by the guide element when the cartridge is inserted properly into the holder, and thereby the shutter is moved from the closed position to the open position thereof.</p> |
