Patent ID: 6081348
Filing Date: 2000-06-27
Classification: G03G,H04N

Abstract:
In an image processing machine including a control, a dual beam laser scanner, and a sensor system to monitor developed process control test patches, a method to determine laser beam failure comprising the steps of:monitoring the reflectance of a bare photoreceptor test patch and recording a value,developing a first special test patch with a first laser beam on and a second laser beam off, the first special test patch providing an approximately 50% halftone developed signal if the first laser beam is operative,developing a second special test patch with the second laser beam on and the first laser beam off, the second special test patch providing an approximately 50% halftone developed signal if the second laser beam is operative,comparing the halftone developed signals from both the first and second special test patches to the reference signal, anddetermining the operability of the first and second laser beams.