Light beam control in an image exposure apparatus

摘要

An image exposure apparatus of a different angle incident type is provided having a single optical sensor unit for determining the timing for start point synchronization along the main scanning direction, an output level detecting means for determining the output level of each beam of light which can be detected by the optical sensor unit, a first modulating means for modulating the output level of each beam of light with a pixel data in the light path for exposure, and a second modulating means for modulating the output level of each beam of light to a higher level outside of the light path for exposure than the level determined by said output level detecting means.