Abstract: A cartridge device for a recording medium in which the effect of dust generated in a bearing portion between a cartridge main body portion and a lid member is suppressed for maintaining reliability even on prolonged use. A housing section 15 for a recording medium 1 formed in a cartridge main body portion 11 and a supporting void 17 for supporting a lid member 12 adapted for opening or closing a recording/reproducing aperture 16 are formed as voids separated from each other by a partitioning wall section 19. On the inner peripheral wall section in the supporting void 17 are formed an annular projection 22 and annular recesses 23 in continuation to one another. The lid member 12 is formed with supporting shafts 28 on the outer peripheral surface of which annular projections are formed in continuation to one another.

Abstract: A disc for recording information signals includes a disc substrate of a synthetic resin having a center hole and an information signal recording layer formed on one major surface and a magnetic plate arranged on the major surface for closing the center hole. A recess for accommodating the magnetic plate is formed on the major surface of the disc substrate for surrounding the center hole. At least a part of the rim of the recess is thermally deformed for forming one or more lugs for holding the magnetic plate disposed in the recess with respect to the disc substrate by the lug(s).