| 摘要 |
The formation of a high-quality image at a resolution at which a dot size is smaller than the diameter of a laser beam is attained at a low cost. When an exposure operation is carried out by increasing an optical intensity of a laser beam to a level higher than that of a steady-state optical intensity thereof by utilizing a difference, which is ascribed to an exposure rate of a photosensitive body, in the condition of a latent image formed, the depth and width of a latent image, which were small in all related art cases, can be increased to high levels. Therefore, overshoot is generated at the LD lighting starting time to increase the optical intensity at a rising edge of the laser beam to a level higher than that of a steady-state optical intensity thereof, whereby a height to width ratio and the reproducibility of one dot and a halftone in a case where the resolution is smaller than the diameter of the laser beam can be improved.
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