Illuminating an exposure surface, especially for board manufacture, involves defining gray filter with variable profile over illumination area depending on intensity differences

摘要

The method involves determining a number of intensity values for different points and/or sub-areas of the radiation cross-section, determining intensity difference compensation varying over the exposure area (3) from the different intensity values, defining a gray filter with variable profile over the illumination area depending on the intensity differences and placing the gray filter in the beam path between the light source and exposure area. AN Independent claim is also included for the following: an arrangement for illuminating circuit boards and similar and a sky filter for an inventive arrangement.