Pattern metallized optical varying security devices

Details Pattern metallized optical varying security devices Pattern metallized optical varying security devices

1995-05-11

1998-07-28

Henry, Jon W.

Optical: systems and elements

Holographic system or element

Authentication

283 86, 235380, 235441, 235451, 235492, 34082534, 342 51, 428916, G03H 100

Patent

active

057869103

ABSTRACT:
Security devices which are difficult to reproduce include a grid screen metallization pattern. The grid screen metallization pattern may be laid down over a hologram or diffraction grating formed as a surface relief pattern on a substrate, to form a visually identifiable, semi-transparent security device. Additionally, the metallization pattern may include resonant structures in which information about the security device is encoded. In some embodiments of these security devices, the metallization pattern is disposed in accurate registration with the underlying hologram or diffraction grating. These security devices are made by methods which include printing an oil pattern on the substrate. Areas on which oil is deposited do not receive metal during a metallization step. Since these methods do not use caustics, metallization patterns including features which would otherwise trap and hold caustics are possible.

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