Optically diffracting security element

Details Optically diffracting security element Optically diffracting security element

1984-12-14

1987-05-05

Corbin, John K.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283904, 35016217, 35016218, 35016223, 350 37, 427 7, 427162, 428 30, 428915, 428916, B42D 1500, B44F 112, B05D 506, G02B 518

Patent

active

046626530

ABSTRACT:
A security element for authenticating bank notes, credit cards, security passes and the like is disclosed. The security element incorporates a reflective-type diffraction grating, which grating comprises a continuous layer of reflecting material on which is deposited a layer of dielectric material. Non-continuous reflecting layer portions are embedded in the dielectric material. It is practically impossible to lay bare the diffraction grating without destroying it.

REFERENCES:
patent: 4094575 (1978-06-01), Kellie
patent: 4129382 (1978-12-01), Greenaway
patent: 4476161 (1984-10-01), Pohle et al.
patent: 4490440 (1984-12-01), Reber

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