| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable the easy identification of genuineness or not by reproducibly recording apertures and fine patterns spaced apart so that the fine patterns are visible opposite the aperture through virtual apertures. SOLUTION: Diffracted light 19 is generated at a reflection hologram 3' when a volume phase type holograph photosensitive material 22 is separated from an original plate 11 and is made incident with reproducing illumination light 18 from the front surface side. Since the diffracted light 19 passes only the region of the reflection hologram 3', the light eventually traces the same optical path as the optical path where the virtual aperture patterns 3" exist in the position of the original reflection hologram 3' and the virtual aperture patterns 3" eventually exist. When a person views the volume phase type holograph photosensitive material 22 from the direction of the diffracted light 19, the person is able to view the drop-out fine pattern regions 21 opposite the pattern through the virtual aperture patterns 3". When the person moves the visual point relatively, the drop-out fine pattern regions 21 eventually move and change.</p> |
