OPTICAL INDICIA READING TERMINAL WITH COMBINED ILLUMINATION

摘要

An optical indicia reading terminal (100) can comprise an image sensor (62,1032), an imaging lens (1110) configured to focus an image of decodable indicia (15) on the image sensor (62,1032), an analog-to-digital converter (1037) configured to convert an analog signal read out of the image sensor (62,1032) into a digital signal representative of light incident on the image sensor (62,1032), a hand held housing (52) encapsulating the image sensor (62,1032), a microprocessor (1060) configured to output a decoded message data corresponding to the decodable indicia (15) by processing the digital signal, and an illumination assembly (1207). The illumination assembly (1207) can include at least one visible spectrum illumination source (322a-322z) and at least one invisible spectrum illumination source (324a-324z). The visible spectrum illumination source (322a-322z) can be configured to emit a light having a wavelength belonging to a visible spectrum region. The invisible spectrum illumination source (324a-324z) can be configured to emit a light having a wavelength belonging to an invisible spectrum region. The intensities of light emitted by the visible spectrum light sources (322a-322z) and invisible spectrum light sources (324a-324z) can be chosen to minimize a perceived combined light intensity while providing an illumination sufficient for obtaining an image suitable for decoding the decodable indicia (15).

主权项

1. An optical indicia reading terminal comprising:
an image sensor; an imaging lens configured to focus an image of decodable indicia on said image sensor; an analog-to-digital converter configured to convert an analog signal read out of said image sensor into a digital signal, said analog signal being representative of light incident on said image sensor; a hand held housing encapsulating said image sensor; a microprocessor configured to output a decoded message data corresponding to said decodable indicia by processing said digital signal; an illumination assembly including at least one visible spectrum illumination source configured to emit a first light having a first wavelength, said first wavelength belonging to a visible spectrum region, and at least one invisible spectrum illumination source configured to emit a second light having a second wavelength, said second wavelength belonging to an invisible spectrum region; wherein said first light intensity and said second light intensity are chosen to minimize a perceived combined light intensity while providing an illumination sufficient for obtaining an image suitable for decoding said decodable indicia.