Checking an identity, authority or check document or the like

Details Checking an identity, authority or check document or the like Checking an identity, authority or check document or the like

1975-10-21

1977-09-06

Dixon, Harold A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250330, 250338, 250458, G01J 100

Patent

active

040470334

ABSTRACT:
A document such as an ID-card is provided with check markings comprising a material based upon rare earth metals and having the property that when excited by IR radiation it emits visible light. When checking the document, the document is irradiated with pulsed IR radiation, the occurrence of corresponding visible light pulses originating from said material being detected. The visible light pulses have well defined rise and decay times dictated by the check material used, which fact is used to check that output pulses from the detector are the correct ones for indicating the genuiness of the document.

REFERENCES:
patent: 3070698 (1962-12-01), Bloembergen
patent: 3105908 (1965-04-01), Burkhardt et al.
patent: 3452332 (1969-06-01), Bron et al.
patent: 3473027 (1969-10-01), Freeman et al.
patent: 3539941 (1970-11-01), Halverson
patent: 3564215 (1971-02-01), Peoples
patent: 3586640 (1971-06-01), Pershan
patent: 3654463 (1972-04-01), Geusic
patent: 3663813 (1972-05-01), Shaw
patent: 3764807 (1973-10-01), Pollack
patent: 3793527 (1974-02-01), Forest
patent: 3958970 (1976-05-01), Auzel et al.
Efficient Green-Emitting IR Phosphors by Kano et al., Electro Chemical Society vol. 119 No. 11 Nov. 1972 pp. 1561-1564.

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