| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable unevenness in exposure resulting from variations of the quantity of light between each light-emitting element to be corrected even in the case where digital correction is performed. <P>SOLUTION: A light quantity correction method includes a step of acquiring a quantity of light of each light-emitting element before correction by applying a drive signal corresponding to a predetermined set value to each light-emitting element (S10), a first calculation step of finding a deviation in the quantity of light of the quantity of light before correction from a target quantity of light for each light-emitting element (S20), a second calculation step of calculating a real number correction value indicating a real number multiple of a unit set value, which is a minimum unit to set a drive signal, using the quantity of light chart and the deviation in quantity of light for each light-emitting element (S30), and a step of dividing the real number correction value into a first correction value obtained by rounding the real number correction value into an integer value, and a second correction value, which will be less than the unit set value, obtained by subtracting the first correction value from the real number correction value (S40), changing the first correction value using the divided second correction value (S45), and correcting a predetermined set value of the drive signal by the changed first correction value (S50). <P>COPYRIGHT: (C)2013,JPO&INPIT |
