The object of the present invention is to provide a forgery proof and copying proof diffraction structure which by virtue of {HEAD ~ a high spatial frequency} has {TAIL ~ a clearly recognizable pattern} 
The object of the present invention is to provide a forgery proof and copying proof diffraction structure which by virtue of { HEAD ~ a high spatial frequency } has { TAIL ~ a clearly recognizable pattern }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL