Patent ID: 7079230
Filing Date: 2006-07-18
Classification: G06K

Abstract:
1. An authentication device for authenticating a mark on a substrate, the mark being of any desired pattern and including a light-sensitive compound that, when irradiated with IR light having a predetermined excitation wavelength in the IR range, emits IR light having a first predetermined emission intensity at a first predetermined emission wavelength in the IR range, with the first predetermined emission wavelength comprising any wavelength selected from a range of wavelengths between and including peak and non-peak emission wavelengths and with the predetermined excitation wavelength being different from the predetermined emission wavelength, with the first predetermined emission intensity comprising any intensity selected from a range of intensities between and including relatively high and low emission intensities, the device comprising: a video mode comprising: a snapshot mode comprising: a snapshot mode detector comprising an IR light detector adapted to detect any IR light emission, said an IR light emission including light emission having the first predetermined emission intensity at the first predetermined emission wavelength in the IR range from the light-sensitive compound in the mark after the mark has been irradiated with IR light from the IR light source, the IR light detector adapted to provide data representative of the detected first predetermined emission intensity of IR light at the first predetermined wavelength from the light-sensitive compound in the mark;