| 摘要 |
<p>PROBLEM TO BE SOLVED: To use quantity-of-light correction data of the same emission color in common while obtaining output density by raising the level of the min. quantity of light when the brightness irregulality of all light emitting dots is corrected. SOLUTION: A memory means 45 storing a value, which is obtained by dividing the min. value of the sum of quantities of light of light emitting dots 7 positioned at the same place in the main scanning direction of a plurality of optical printing heads 2R1, 2R2 (VFPH) comprising a dot array of the same emission color having a plurality of light emitting dots 7 by the quantities of light of the light emitting dots 7, as the correction data of the light emitting dots 7 of both VFPHs 2R1, 2R2 is provided to either one of both VFPHs 2R1, 2R2. The correction data of the same memory means 45 is read from both VFPHs 2R1, 2R2 at the time of correction of quantity of light and the control data of pulse width corresponding to this correction data is inputted to anode drivers 14A, 14B to correct the quantities of light of the light emitting dots 7 of both VFPHs 2R1, 2R2.</p> |
