Viewing device and method for ascertaining simultaneously optica

Details Viewing device and method for ascertaining simultaneously optica Viewing device and method for ascertaining simultaneously optica

1996-02-28

1997-01-21

Gonzalez, Frank

Optics: measuring and testing

Document pattern analysis or verification

356420, 359 2, 359471, 359472, 359475, 359477, 283 91, 283 85, 283 57, 428913, 428915, 428916, G06K 974, B42D 1500, G02B 2722, G01N 2125

Patent

active

055964028

ABSTRACT:
A viewing device for use by an observer to ascertain the authenticity of an instrument of value having an image formed from an optically variable device. The viewing device includes a frame structure which permits viewing of the image in a fixed spatial orientation and a reflector carried by the frame structure for permitting the observer to see simultaneously the image in first and second colors without movement of the observer, the viewing device or the image.

REFERENCES:
patent: 3744917 (1973-07-01), Craig
patent: 4618257 (1986-10-01), Bayne et al.
patent: 4968064 (1990-11-01), Mancuso

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