| 摘要 |
<p>PROBLEM TO BE SOLVED: To enhance an operation efficiency by obtaining a desired exposure light quantity without lowering a scanning speed. SOLUTION: Two R(red color)-LED chips 208R are arranged in the main scanning direction. One G-LED chip 208G and one B (blue color)-LED chip 208B are provided. Therefore, a ratio of the numbers of LED chips becomes R:G:B=2:1:1. When one main scanning line is indicated by a solid line arrow by diving into each of colors, two R lines, one G line and one B line are written thereinto. As a result, only a light quantity of R color is doubled so that the light emission quantity of the R-LED chips 208R is equal to that of the other LED chip 208.</p> |
