| 摘要 |
PURPOSE:To simplify the opening and closing mechanism for the opening part of a cartridge equipped with a discoid recording medium, and to prevent destruction and malfunction by providing a long groove having a channel shaped section at the outside part of the cartridge, and also positioning part of a shielding member in said groove. CONSTITUTION:In the space 12 formed on recessed parts of upper and lower plates 2 having steps 14 for insertion guides at both side edge parts, a magnetic sheet 1 is incorporated rotatably, and while long-hole opening parts 4 for moving magnetic head in a radius direction of the sheet 1 are shield by sliding and rotating shielding members 9, detection holes 5 for detecting an index hole 7 made in the magnetic sheet 1 are also shield to hold the space part in a sealed state. One end of the shielding member 9 is slid and rotated in a guide groove 13 by engaging the cut part 10b of a beltlike flexible member 10. Further, the upper and lower plate step parts 14 form a channel-sectioned long groove, which serves as a sliding guide in loading. |
