| 摘要 |
<p>PURPOSE:To eliminate the need of using a high-cost aluminum heat sink reduce the size of a power source module, and lower the cost of a device. CONSTITUTION:The number of black printing data contained in video signals (VIDEO) is counted by a counter 21. From the result of the counting, a printing ratio is calculated in a CPU 15. In accordance with the printing ratio, an output time of strobe signals outputted through an I/P port 18 is changed. In this manner, a change in quantity of light in optical-writing to a photosensitive body, resulting from a change in output voltage to a light exposure head on the basis of the fluctuation of a printing ratio, is compensated by changing an output time of strobe signals.</p> |
