| 摘要 |
<p>PURPOSE:To improve the forgery preventing effect and to easily and surely discriminate a true object by constituting a reflection face part of plural areas which do not overlap and reflecting illuminating light in plural directions different from one another. CONSTITUTION:A diffraction grating part 4 consisting of many approximately square areas as a light reception face part is provided in a position parallel with a magnetic stripe 2 on a principal face 1a of a card. The diffraction grating 4 has such reflection direction characteristic that illuminating light having a prescribed wavelength from the direction opposite to the diffraction grating part 4 is reflected as diffracted light in peculiar directions and is condensed. On the card read/write side, a light emitting element 5 as the laser light projecting means is provided in a position opposite to the diffraction grating part 4, and a light emitting element 6 as the light reception face part which is divided by many division lines to surround the light emitting element 5 is provided together with the light emitting element unitedly.</p> |
