Radiant energy – Luminophor irradiation
Patent
1995-03-08
1997-03-04
Hannaher, Constantine
Radiant energy
Luminophor irradiation
250271, G06K 710
Patent
active
056082258
ABSTRACT:
A fluorescent light emitted from a marking containing at least one fluorescent substance is detected by illuminating the marking with an exciting light having an intensity that varies at a predetermined cycle, converting a change in intensity of light reflected from a position where the exciting light is irradiated into a varying electric signal and selectively extracting from the converted electric signal, only an electric signal component having a frequency matching with but a phase displaced from, that of a signal component corresponding to light reflected from the marking. A fluorescent detecting apparatus for this purpose includes a light source for irradiating at an irradiating station a marking formed on a medium with rays of light having an intensity that varies cyclically, the marking having at least one fluorescent substance. The apparatus further includes a photo-electric detector for detecting incident rays of light reflected from the irradiating station and converting the rays of light into an electric signal, and a phase detector for extracting from the electric signal respective signal components corresponding to the rays of light reflected from the marking and the medium, respectively.
REFERENCES:
patent: 4275299 (1981-06-01), Favre
patent: 4642526 (1987-02-01), Hopkins
patent: 4983817 (1991-01-01), Dolash et al.
patent: 5210411 (1993-05-01), Oshima et al.
patent: 5270548 (1993-12-01), Steinkamp
Kamimura Kunio
Ohashi Kunitoshi
Oshima Toshio
Hannaher Constantine
Hitachi Maxell Ltd.
Maxell Seiki, Ltd.
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