| 摘要 |
PURPOSE:To change data in real time and to improve light using efficiency by using a phase change type recording material and a one-dimensional optical array shutter as a writing means. CONSTITUTION:A position different from the one-dimensional optical shutter array for writing 51 is irradiated with reading out laser beam 21 from a semicon ductor laser beam source 45 via a lens 27. Information written by the one- dimensional optical shutter array 51 is written so that beams reproduced when the irradiation of the reading out laser beam 21 is carried out are converged on a prescribed one-point. In 3-dimensional information, the data is successively changed with rewriting beams 1 on the radius of a disklike substrate 4. If the data is complex 3-dimensional data, and time is required for calculating, the data is stored in a ROM, etc., inside a calculator 10 in advance, so that higher speed is attained. Thus, high light using efficiency is obtained. |
