LIGHTWEIGHT DUAL-MODE MOBILE SCANNER POWERED FROM UNIVERSAL SERIAL BUS PORT

摘要

PURPOSE: A lightweight dual-mode mobile scanner powered from a universal serial bus port is provided to be powered through a universal serial bus connection where the individual components of the portable scanner are selectively and controllably powered so as to function within the power limitations of the USB port without appreciable degradation of a captured image whether that image resides on a transparent media or an opaque media is described. CONSTITUTION: A mobile scanner comprising an image sensing module comprising: a one-dimensional image sensor array; a lens mounted in front of the image sensor array; and a first illumination source comprising three colored lights that are turned on independently and successively by an illumination control signal when a scanning document is opaque; a second illumination source comprising a colored light that is turned on by the illumination control signal when the scanning document is transparent; a motion mechanism working in synchronization with the image sensing module, the motion mechanism causing the scanning document illuminated by one of the first and the second illumination sources to pass through the lens so that the scanning document is imaged by the image sensor array; and a universal serial bus interface module coupling the image sensing module and the motion mechanism to a computing device and receiving power and system control signals therefrom.