| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and a device for carrying out high-density recording of digital data in high S/N ratio as a hologram. <P>SOLUTION: A filter 20 is a shading body formed with a pinhole 21 facing a position between 0-th order and first order position on a x-axis of a Fourier transform image. By disposing the filter 20 at an upstream side and on a Fourier transform plane of an optical recording medium, only a specific spatial frequency component between luminescent spots penetrates the filter 20, and other spatial frequency component including a DC component are eliminted. Consequently, the useless exposure by the DC component is prevented, so that the S/N ratio is enhanced and only image edge portions of signal light are efficiently recorded. <P>COPYRIGHT: (C)2007,JPO&INPIT |
