| 摘要 |
PURPOSE:To obtain an optical card that is available for high density recording and is not requiring tracking control nor focusing control. CONSTITUTION:Aperture stops are provided to places near the center of curvature of each of convex lenses comprising a convex lens array FEL (or each of cylindrical convex lenses comprising a cylindrical convex lens array CLA), and light directed at steep angle of incidence to the curved surface of the lens is intercepted so that it cannot reach a recording layer RML, and aberration is improved to the light regardless of its angle of incidence so that pits in small diameter can be recorded and formed on the recording layer RML. Thereby an optical card for which high density recording is available can be easily made up. |
