Patent ID: 8520042

Claim:
An exposure apparatus, comprising: a plurality of light sources that emit a light beam; a detection unit that detects light beams emitted from the plurality of light sources; a clock signal generation unit that generates a clock signal; a plurality of driving units each of which respectively drives, among the plurality of light sources, light sources different from each other, and each of which executes a light amount control based on a detection result by the detection unit, causes, in the light amount control, the driven light source to emit the light beams at different timings from each other based on the clock signal input by the clock signal generation unit, outputs a state signal indicating a state of the light amount control, and receives the state signal output by another driving unit; a determination unit disposed to each of the plurality of driving units and configured to determine whether or not an other driving unit is causing the light source to emit light to execute the light amount control based on the received state signal of the other driving unit, wherein each of the plurality of driving units does not cause the driven light source to emit the light beam when another driving unit is causing the light source to emit the light beam to execute the light amount control.