| 摘要 |
An accelerated illuminate response system controls a light emitting diode ("LED"), for instance, in an optical sensor system that monitors ink droplets on a print media in an inknet printing mechanism to adjust future printing for optimal images. A printhead carriage scans an optical sensor across the printed media to determine droplet location, color and hue. The sensor uses an LED to illuminate the media in response to an LED drive signal, and a photodetector to receive light reflected from the media. The LED drive signal first applies a low level pre-warming current, then a high current pulse for a selected duration, and thereafter a normal drive current during a secondary illuminate response until the LED reaches a selected illumination value at or near steady-state conditions. An inkjet printing mechanism having such an optical sensor system is also provided, along with a method of illuminating an LED. |
