| 摘要 |
PURPOSE:To prevent the disc from the attachment of dust and damages, by fixing the magnet rotatably driven with an external rotating magnetic field at the center of the disc stored rotatably in a closed case providing with the photo readout transparent part. CONSTITUTION:The disc 15 is provided in rotation free around the rotating shaft 19 in the enclosed case 14 providing the photo readout transparent window. A pair of circular magnets 51, 52 are bonded at the center of the disc 15 with adhesives 53, 54. A plurality of coils 55 are provided on the printed board 56 in the opening 37 of the cassette loading stand 32 in ring shape. The disc 15 is driven with no contact via magnets 51, 52 by sequentially switching the coils 55 for power application. Thus, the dust sticking and damages of disc 15 can be avoided. |
