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    • 7. 发明授权
    • Information recording disk provided with distinguishing mark
    • 信息记录盘提供区别标记
    • US4814928A
    • 1989-03-21
    • US81538
    • 1987-08-04
    • Hisashi ItoTomiya Sonoda
    • Hisashi ItoTomiya Sonoda
    • G11B23/28G11B5/82G11B5/84G11B23/40G11B5/00G11B5/718
    • G11B5/82G11B23/40G11B5/84
    • An information recording disk comprising a disk-like substrate and magnetic layers formed on both surfaces of the substrate is provided with a mark punched through the disk. The mark is provided by, for example, a hole positioned apart from a reference line passing through both the center of an index hole for specifying the circumferential position of the disk and the center of the disk. If the disk is rotated by 180.degree. about the reference line, the position of the mark is reversed with respect to the reference line, making it possible to distinguish the front and back surfaces of the disk. The magnetic layers formed on both surfaces of the substrate by means of, for example, sputtering, differ from each other in magnetic properties. To determine the magnetic layer used for the information recording-reproduction or to determine the optimum conditions for the recording-reproduction, it is necessary to distinguish the front and back surfaces of the disk. The mark provided in the disk of the present invention permits visually distinguish the front and back surfaces of the disk easily in the step of loading the disk in a package. Also, the mark can be provided in the punching step of a tape having magnetic layers formed on both surfaces thereof in a disk-like shape, thereby eliminating confusion in the later step.
    • 包括盘形基板和形成在基板的两个表面上的磁性层的信息记录盘设置有穿过盘的标记。 标记由例如与通过分度孔的中心的参考线分离的孔设置,用于指定盘的周向位置和盘的中心。 如果磁盘围绕参考线旋转180°,则标记的位置相对于参考线反转,可以区分磁盘的前后表面。 通过例如溅射形成在基板的两个表面上的磁性层在磁性方面彼此不同。 为了确定用于信息记录再现的磁层或确定用于记录再现的最佳条件,需要区分盘的前表面和后表面。 提供在本发明的盘中的标记在将盘装载到包装中的步骤中容易地在视觉上区分盘的前表面和后表面。 此外,标记可以在具有形成在其两个表面上的磁性层的带的冲压步骤中以盘状形式提供,从而消除后续步骤中的混淆。