| 摘要 |
<p>A magnetic recording disc cartridge so called a floppy disc comprising a cover jacket member (1) enclosing a magnetic recording disc with a cleaning sheet (6) disposed between the inside face of the cover jacket member (1) and the magnetic recording disc, an improvement comprises thermally bonding portions for bonding the sheet member (4) and the cleaning sheet (6), in which the bonding portions are a plurality of dots (13) formed around the peripheral portion of a central window (8) along a plurality of lines radially extending from the peripheral edge of the central window (8) with a predetermined space.</p> |
