OPTICAL CARD

摘要

This invention relates to an optical card having a preformat portion comprising a low reflectance area having an excellent contrast to high reflectance area. An optical card original plate whose portions corresponding to preformat portions 4, 5 of an optical card 1 each have a stereostructure of an inverted pyramidal shape is prepared. An optical card is duplicated from this optical card original plate. The stereostructure in an inverted pyramidal shape can be formed by the anisotropic etching of a single crystal substrate. An original plate free from defects and surface roughnesses and ensuring a sufficiently low reflectance is obtained. An optical card produced from this original plate has a preformat portion comprising a low reflectance area with a satisfactory contrast to a high reflectance area. A replica duplicated using a molding resin from the original plate can be used as a resin original plate. Furthermore, a replica duplicated from this resin original plate by use of a molding resin can be used as a stamper for production of an optical card.