Optically variable devices for use on bank notes

John Rolfe

doi:10.1117/12.17908

1 April 1990 Optically variable devices for use on bank notes

John Rolfe

Proceedings Volume 1210, Optical Security and Anticounterfeiting Systems; (1990) https://doi.org/10.1117/12.17908
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

The security of bank notes against counterfeiting can be improved by the incorporation of optically variable devices (OVDs), which change their appearance when the note is viewed in different directions. Three types of OVD; holograms, multiple diffraction gratings, and thin film interference filters will be compared in relation to the special requirements unique to bank notes; security, visibility and durability. The Bank of Canada has recently issued $50 bank notes bearing a five-layer thin film interference filter. The tests which led to this particular form of OVD will be described, together with methods of deposition, quality control, and application to sheets of bank notes.

Citation Download Citation

John Rolfe "Optically variable devices for use on bank notes", Proc. SPIE 1210, Optical Security and Anticounterfeiting Systems, (1 April 1990); https://doi.org/10.1117/12.17908

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available