| 摘要 |
PURPOSE:To maintain excellent magnetic characteristics without oxidation of a recording medium in adverse environment, by embedding a magnetically hard magnetic metal wire material in the groove of a nonmagnetic substrate as a recording medium, forming a Zn layer on a part of the surface or on the entire surface including the recording medium, and forming a nonmagnetic Ni-P alloy layer on the Zn layer. CONSTITUTION:In a groove formed along the longitudinal direction of the side surface of a nonmagnetic substrate in a square column shape, in a circular column shape, or in a circular tube shape, a magnetically hard magnetic metal wire material is embedded as a recording medium. A Zn layer is formed on a part of the surface or on the entire surface of the magnetic metal material including the recording medium. A nonmagnetic Ni-P alloy layer is formed on the Zn layer. Zn is formed as the first layer on the outer surface of a magnetic scale, and the nonmagnetic Ni-P alloy is formed on the outside of Zn as the second layer. Therefore, the thickness of the entire film layer is made thin. By applying Zn and nonmagnetic Ni-P alloy plating, corrosion resistance can be made excellent, the application range of the magnetic scale is expanded, and the scale can be used in adverse environment. |
