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Proceedings Paper

Apparatus and method for making a security hologram with multi-images in different viewing direction on a small area
Author(s): Ying Tsung Lu; Sien Chi
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Paper Abstract

The prior artwork for a Dot-matrix hologram is always animated by a computer instead of a man made sculptured model. For a computer graphic software, it is very easy to interlace several bitmap graphics ona small area. So, if we generate an interlaced graphic and transfer the bitmaps to corresponding gratings which diffract the illumination light to a specific direction with respect to each individual graphic, then it will have several viewing images in different view angles. Hologram has special light characteristics that are difficult to duplicate, so it has intrinsic advantage for anti-counterfeiting application. For more guarantee of security to protect the value paper from the fraud activity. We use a more complex and delicate multi-image hologram to hold back the ambition of copycat. In this paper, will describe how to transfer the images that generated by computer to a hologram. The concept for interlace graphics, and the apparatus that is easy to generate the dot grating with respect to each bitmap in the image, and the practical samples that made by this technology for anti-counterfeiting purpose.

Paper Details

Date Published: 7 April 2000
PDF: 9 pages
Proc. SPIE 3973, Optical Security and Counterfeit Deterrence Techniques III, (7 April 2000); doi: 10.1117/12.382209
Show Author Affiliations
Ying Tsung Lu, Industrial Technology Research Institute (Taiwan)
Sien Chi, National Chiao-Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 3973:
Optical Security and Counterfeit Deterrence Techniques III
Rudolf L. van Renesse; Willem A. Vliegenthart, Editor(s)

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