MAGNETIC TAPE CASSETTE, ITS PART, METHOD FOR MOLDING THE PART, METHOD FOR MARKING MOLDED PRODUCT, AND MOLDED PRODUCT

摘要

A magnetic tape cassette is provided with a lower half or a slider having a recess portion (groove) in the vicinity of a guide groove for determining a driving position of a magnetic tape and on the opposite side along the guide groove; a slider having a dust-proof wall in an engagement sliding portion; a brake member having thickness reducing portions on the rear side of the sliding surface of the horizontal plate portion and having a thickness thus being kept substantially constant; a lower half or a slider having a groove portion for providing a stamped portion which is formed symmetrically, a leaf spring having a drawn portion in at least one of plate surfaces of arm portions and a central bent portion; and the like. As a result, in the magnetic tape cassette, it is possible to suppress deformation such as warpage of side walls due to molding shrinkage difference or the like of the slider or the lower half, to prevent deformation of the brake member due to the molding shrinkage difference, to keep excellent dimensional precision, to improve the dust-proof property, and to improve a degree of freedom in designing leaf springs to thereby reduce the cost and to improve the productivity. Further, in the slider of the magnetic tape cassette, at least upper and lower end faces of vertical wall surfaces of a side core of molds for molding the side walls are rounded so that the side walls ride over the side core when the molds are opened after molding to thereby make it possible to mold a slider that is superior in terms of outer appearance and moldability, without sacrificing the dimensional precision. The molded article stamping method may Further be applied to a plastic molded article in addition to the magnetic tape cassette. <IMAGE>