| 摘要 |
PURPOSE:To obtain high C/N by using heat contracting resin for a part or all of a recording medium and forming an inclined plane having about 45 deg. from the surface of the recording medium. CONSTITUTION:The light recording medium has a triangular group with about 90 deg. at its point. Namely, the opposed inclined planes of the group make 90 deg.. Light A is reflected as B, C and D. The incident light AB is geometrically parallel with the reflected light CD. The light is condensed by a lens and made incident to a light memory. In this case, the parallel relation between the light AB and CD is kept as it is. Thus, such a constitution makes it possible to obtain high SN. |
