Transparent optical identification label with infrared directivi

Details Transparent optical identification label with infrared directivi Transparent optical identification label with infrared directivi

1992-01-27

1994-04-05

Shepperd, John

Registers

Records

283 86, 283 91, 356 71, 359 2, 235468, G06K 710, B42D 1500, G02B 2738

Patent

active

053007646

ABSTRACT:
An optical identification label consisting of an area of hologram or diffraction grating which is transparent to visible light but reflects incident light with a specific reflective directivity. By identifying the reflectivity directivity, it is possible to identify the authenticity of the label and, hence, the object to which the identification label is affixed. The fact that the identification label is transparent to human eyes offers a strong discouraging effect on potential forgers. Further, the pattern of the reflected light may be used as means for encoding data.

REFERENCES:
patent: 3536894 (1970-10-01), Travioli
patent: 4034211 (1977-07-01), Horst et al.
patent: 4501439 (1985-02-01), Antes
patent: 4856857 (1989-08-01), Takeuchi et al.

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