TONER STREAK DETECTION WITH IMPROVED RESOLUTION AND RELIABILITY
Original Publication Date: 1993-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
Disclosed is an improved economical method for detecting toner streaks on the surface of a photoreceptors. Figure 1 shows a prior art streak detection scheme in the known 'reflection' made. The improved method uses a cylindrical lens 1 positioned above the photoreceptor 2 which permits the formation of an electronic image of any streaks 3 on a sensitive area of a scanning phototransistor 4 having a scanning direction 5 perpendicular to the process direction and parallel to extended light source 6 as illustrated in Figure 2. As shown in Figure 2, 'transmission' mode detection, enables the detection of both thin and low density or low developer mass per unit area (DMA) toner streaks. The method is immune or unaffected by scratches and other blemishes on the photoreceptor surface, while maintaining a high level of sensitivity to toner streaks. The method has potential application in various subsystems in xerographic copiers and printers, particularly in detecting blade cleaner efficiency and failure.