A barcode imaging system and source of electromagnetic radiation therefor

摘要

A barcode imaging apparatus comprises a source of electromagnetic radiation and an image acquisition device. The acquisition device is configured to be sensitive to a wavelength of electromagnetic radiation emitted by the source of electromagnetic radiation. In use, a bar code to be read is illuminated by the source of electromagnetic radiation and an image of the barcode is captured by the image acquisition device at the wavelength of that radiation. The source of electromagnetic radiation comprises a Light Emitting Diode (LED), a Current Source; a Driver for said current source; a Clock Pulse Generator; and a Monostable. The LED is powered by the Current source which is in turn driven by the Driver which is controlled by the Clock Pulse Generator through the Monostable.