| 摘要 |
The invention provides a hologram in which a visually unidentifiable microtext or other micropattern of the order of 10 μm is recorded, and a process for the fabrication of the same. A volume hologram recording material 2 is located on the side of a reflection type volume hologram master 1 onto which copying illumination light 11 is incident, and the copying illumination light 11 incident onto the recording material 2 and light 12 diffracted through the master 1 interfere together in the volume hologram recording material 2 thereby copying the reflection type volume hologram master. In this case, a reflecting plate 5 having a fine regular reflection pattern 3 is interleaved between the master 1 and the recording material 2, and the copying illumination light 11 incident onto the recording material 2 and regularly reflected light 32 from the reflecting plate having the regular reflection pattern 3 interfere together in the recording material 2 thereby allowing the regular reflection pattern 3 to be multi-recorded in a hologram having the reflection type volume hologram master 1 copied in it. |
