| 摘要 |
PURPOSE:To obtain an optical card system at low cost by providing a recording layer, in which a recording is executed with the irradiation of the light of a light intensity at a prescribed threshold or above, and a cylindrical convex lens array, in which cylindrical convex lenses with microwidths are contact-arranged in parallel on one surface, to an optical card. CONSTITUTION:For an optical card LAC, a recording material, which cannot be recorded even by the irradiation for a long time of the light of the light intensity at the prescribed threshold or below and which is recorded by the irradiation of the light of the light intensity at the prescribed threshold or above, is used, a two-dimensional enlargement is provided, and a recording layer RML is provided on a base material 14. Further, the title device is equipped with a cylindrical convex lens array CLA composed by contact-arranging the cylindrical convex lens with the microwidths on one surface of the recording layer RML. As a result, even when an automatic tracking control action and an automatic focus control action are not used, a high density recording and reproducing can be executed. Thus, the optical card system at a low cost accompanied by a recording and reproducing device with simple constitution can be obtained. |
