A raster print engine driver for generating from incoming data representative of a continuous tone or text image, a transition-modulated engine drive signal for causing the engine to reproduce the image as a series of modulated print lines, in which the driver establishes a cell scan time period representing...http://www.google.de/patents/US5109283?utm_source=gb-gplus-sharePatent US5109283 - Raster scanning engine driver which independently locates engine drive signal transistors within each cell area
