UNEVEN EXPOSURE CORRECTING METHOD FOR LIGHT EMISSION ELEMENT ARRAY

摘要

PURPOSE:To determine light emitting condition of each light emitting element preferably by repeating corrective amount calculating step and corrective exposure step until fluctuation of density on a film exposed through the corrective exposure step comes within an allowable range thereby updating the corrective amount. CONSTITUTION:A density corrective amount calculating means 11 calculates the difference between a preset target density and the average density of LEDs, then the difference is converted into a corrective amount C which is fed, as density corrective data, to a density corrective data section 5. Then a new film 10 is set and each LED is excited with such density signal E and corrective amount C as to enable uniform density printing thus exposing the new film 10. Thereafter, the exposed film 10 is developed and subjected to visual inspection of the uniformity of density. A density distribution measuring device 12 measures the density D of the film 10 and produces density distribution data. The steps are repeated until the corrective amount C converges to an optimal value.