Optical head, exposure apparatus and image forming apparatus capable of restricting noise

摘要

An optical head expresses gray scales of pixels, which belong to a block constituted by n pixels and m pixels in a first and second direction, respectively. The optical head includes light emitting devices that extend in the first direction and emit light; driving transistors that are provided corresponding to the light emitting devices; a potential line that applies potential to the driving transistors; and driving circuits that are provided corresponding to the driving transistors and that supply a driving control signal to gates of the driving transistors. The driving circuits each include a line having an intersection at which the line intersects the potential line; and a logic circuit that generates the driving control signal based on image data to instruct the light emitting devices. The logic circuits invert logic levels of the lines at the intersections every n number of intersections extending in the first direction.