| 摘要 |
PURPOSE:To obtain an excellent optical molded part by employing a spherical surface die with continuous hemispherical surfaces, which are formed by electroplating the electrically-conductive surface of a base with a large number of male micro-projections so as to obtain a continuous surface with hemispherical surfaces, each of which is positioned with center at the male micro-projection and the radius of hemisphere of which is nearly the same dimension as the thickness of electroplating. CONSTITUTION:As a minimum. a surface with a large number of male micro-projections 14, which has the predetermined height and the centers of which are at predetermined intervals one another, is formed onto the surface of a flat base 15 and electroplate 16 is applied onto said surface with male projections so as to form a continuous hemispherical surfaces, the radius of hemisphere of which is nearly the same as the thickness of electroplating in order to form a spherical male die. Furthermore, a metal oxide layer 17 with mold release property is formed onto said surface of the spherical male die is formed, if necessary. After that, the surface of a spherical female die is formed by electroforming method or by applying electroplate onto the surface of the spherical male die and then releasing from the surface of the spherical male die in order to invert the surface form. The part suitable for optical molded part is obtained by employing the spherical female die for molding. |
