Optical security articles and methods for making same

Details Optical security articles and methods for making same Optical security articles and methods for making same

1996-09-25

1998-04-28

Engel, James

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

1562755, 156290, 156292, 156298, 428916, B32B 3100

Patent

active

057439818

ABSTRACT:
Optical security articles and methods of making same are described comprising a first layer substantially transparent to visible light and having a first refractive index, the first layer having a relief pattern on a first surface thereof and a substantially smooth second surface, and an adhesive layer coterminating with the first layer. The adhesive layer substantially completely fills and makes contact with a first portion of the plurality of geometric concavities, the adhesive layer having a second refractive index which is substantially similar to the first refractive index of the first layer. A second portion of the plurality of geometric concavities are precluded from contact with the adhesive layer by a corresponding plurality of separation layers, each separation layer having a separation layer refractive index which is different from the refractive index of the first layer.

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