Patent ID: 6682163
Filing Date: 2004-01-27
Classification: G03G,H04N

Abstract:
Method to detect any register errors in the lateral or â€œcrosstrackâ€  direction, in multicolor printing by a sensor device 70 for detection of at least one registration mark (10, 11, 12, 13, 20, 21, 22, 23, and 30) arranged in registration mark areas (50), the method comprising the steps of: detection of sensor values of registration mark areas (50) as an arrangement of triangular registration marks (10, 11, 12, 13, 20, 21, 22, 23, and 30) with a sensor of the sensor device (70), such detecting of sensor values being the counting of clock pulses where each counting cycle of clock pulses for detecting sensor values begins with a first light/dark transition of the first registration marks (10, 20) and each successive light/dark transition of the registration marks (10, 11, 12, 13, 20, 21, 22, 23, and 30) is detected and ends with the last light/dark transition of the last registration mark (13, 23), whereby a color separation is assigned to each triangle during multicolor printing and images of respective differential values are formed from the sensor values.