| 摘要 |
A method of operating a data reader including an imaging reader with an imager having a scan zone, and a source of visible light including at least one LED, the method can comprise: illuminating the scan zone by pulsing the LED to generate pulses of visible light at a frequency sufficient to prevent a flashing sensation and having a constant pulse width; initiating a series of exposures of the imager, the imaging reader outputting synchronization signals; synchronizing the pulsing of the LED by the synchronization signals; placing an item in the scan zone, thereby reflecting at least a portion of the visible light as reflected visible light; sensing the reflected visible light via the imaging reader; and automatically adjusting an exposure time of the imager based on the intensity of the reflected visible light received at the imaging reader. |
