|Photocopying Processes.pdf||Photocopying Processes
Overview Charge Exposure Development Transfer and Separation Cleaning Quenching Fusing
1 1. Scanning An exposure lamp illuminates the original. Light reflected off the original is used to create the image on a drum*. In analog machines, the light is reflected through a series of mirrors, eventually striking the drum directly. For multi-copy runs, the original must be scanned for each copy. In digital machines, the reflected light is passed to a CCD or CIS, where it is converted into an analog data signal. This data is further converted to a digital signal, processed, and stored in memory. To print, the data is retrieved and sent to a laser diode. For multi-copy runs, the original is scanned only once and stored to a hard disk. * In this overview section we refer to the photoconductor as a drum just for simplicity. However, be aware that the photoconductor is often an OPC belt rather than a drum.
1 April 2001 Page 90