Patent ID: 7289137
Filing Date: 2007-10-30
Classification: B41C,G03G,H04N

Abstract:
1. A method for equalizing exposure heads of an exposer that records printing originals onto a recording material using the exposure heads, each exposure head having a laser module, the method which comprises: generating with each exposure head at least one laser beam and focusing the at least one laser beam onto the recording material; sweeping the at least one laser beam of the exposure heads over the recording material in a main scanning direction while moving the exposure heads along the recording material in a secondary scanning direction; recording a recording band with each exposure head; and with regard to an area coverage recorded: carrying out a test exposure in which each exposure head records a test form having test areas and a background area in the recording band of the respective exposure head; visually comparing the area coverage recorded of the background area of a test form with area coverages recorded of the test areas of an adjacent test form; assessing the differences of the area coverages in adjacent test forms by determining a test area of the adjacent test form with the smallest difference of area coverage in comparison to the background area of the first test form; calculating from the differences of the area coverages in adjacent test forms corrective values for the laser power of the laser modules in the exposure heads; and adjusting the laser power to equalize the exposure heads with one another.