| 摘要 |
PURPOSE:To record various control information without decreasing the information to be recorded in information tracks by providing a hologram recording part to a part of an optical card. CONSTITUTION:This optical card is formed by laminating a dye layer 13 which is layer to scatter and absorb light beams and a chalocogen glass layer 12 which is a layer to reflect the light beams successively on a substrate 14. The chalocogen glass 12 is constituted essentially of chalocogen glass consisting of 8-28 As, 62-80 S and 3-15 Te and the hologram recording part 5 forms a hologram pattern by projection of the light beam to the chalocogen glass layer 12. The luminous flux projected from a light source 16 is bisected by a beam splitter 17. One of such beams is projected to an object 18 and the reflected luminous flux and the other reference wave are interfered with each other to make recording on the optical card 1. |
