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Kenji Yamamotoya
at NHK Spring Co Ltd
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Author
Publications (2)
Proceedings Article | 3 June 2004 Paper
Proposal of qualitative classification for security devices
Proceedings Volume 5310, (2004) https://doi.org/10.1117/12.527224
KEYWORDS: Information security, Manufacturing, Instrument modeling, Optical fibers, Measurement devices, Lead, Laser engraving, Diffraction, Adhesives
Proceedings Article | 7 April 2000 Paper
CPLgram: an advanced machine-readable OVD that is obtained by combining diffraction gratings and liquid crystals
Itsuo Takeuchi, Kenji Yamamotoya, Tsugutaka Sugahara, Hidekazu Hoshino, Hiroyuki Matsumoto, Tsutomu Matsumoto
Proceedings Volume 3973, (2000) https://doi.org/10.1117/12.382193
KEYWORDS: Diffraction, Liquid crystals, Diffraction gratings, Circular polarizers, Inspection, Holograms, Sensors, Eye, Polarization, Molecules
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