| 摘要 |
PURPOSE:To obtain a device to correct accumulated light intensity over time of an LED head in a single accumulated light intensity over time measurement for each element by providing a correction data preparation device for corrected data preparation based on an estimated correction data using correction table from the results of light output measurement by a device to measure accumulated light intensity over time. CONSTITUTION:Accumulated light intensity over time Pi in the specified correction data of each element, for example, correction data D7(I2 level) is measured by a device to measure the accumulated intensity over time of light which consists of an LED head drive device 6, a light sensor 2 and a light power meter 3. In order to prepare correction data for each element, correction data is prepared using a correction table 5 which is preset using a general, relative characteristic curve of accumulated light intensity over time. Correction data of each element is prepared based on the table in the same manner. Thus the correction data is prepared using a preset correction table based on the characteristic of accumulated light intensity over time for correction data of LED elements. Consequently, the correction data can be prepared based on the results of accumulated light intensity over time measured once for each element. |
