Picture exposure apparatus for photographic paper used in laser printer

摘要

The apparatus includes at least three types of light sources which emit light with different wavelengths. A deflection unit deflects the light in a predetermined scanning direction. A scanning lens (220) for the emitted light is provided and a clock generation unit which generates a scanning clock for two types of the emitted light and a scanning clock for the third type of emitted light. A modulation unit modulates the emitted light based on the picture data and the scanning clocks.