| 摘要 |
PURPOSE:To obtain the optional part of an image as the optional visibility by vibrating a focusing lens for focusing exposure light on a photosensitive body and changing the focusing position of the exposure light by the vibration of the focusing lens to expose the photosensitive body. CONSTITUTION:A laser flux 2 forms a focus on the surface of the drum-like photosensitive body 4 by the focusing lens 3. A signal control device 6 for vibrating the lens 3 by impressing an AC signal vibrates the lens 3 through a supporting body 5. When the AC signal to be impressed to the supporting body 5 is changed from + or -6V amplitude and 30kHz frequency to + or -2.4V amplitude and 60kHz frequency while rotating the photosensitive body 4, lines formed on the photosensitive body 4 are changed to thin and clear lines. When the AC signal is changed to + or -6V amplitude and 3kHz frequency, e.g., unclear lines are formed again, and when the AC signal is changed to + or -12V amplitude and 30kHz frequency, more unclear lines are formed.
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