| 摘要 |
<p>PURPOSE:To prevent the variation in the print darkness in an electronic photography unit, by stabilizing the luminance through the correction automatically for detecting the variation in the luminance of CRT. CONSTITUTION:The output voltage from the photo detection element 2 detecting the luminance of CRT1 and the reference voltage are compared 5, the correction voltage gradually increasing or decreasing based on the result of comparison is produced 8, and the luminance correction 4 is made by adding the correction voltage to the luminance voltage. Further, the correction voltage is generated so that the output voltage from the photo detection element 2 and the reference voltage can almost be in agreement with each other.</p> |
