Exposure apparatus and image-forming apparatus

An exposure apparatus comprising:

• at least one light-emitting chip having a plurality of light-emitting elements arranged along a line parallel with an axial direction of a photosensitive member that is configured to rotate;
• a synchronization signal generation unit configured to generate a first synchronization signal synchronized with a second synchronization signal corresponding to a rotation speed of the photosensitive member, the first synchronization signal being used to control transmission of a data signal for each line to the at least one light-emitting chip;
• and
• a transmission unit configured to transmit, to the at least one light-emitting chip, a data signal of one line used for light emission control of the plurality of light-emitting elements, during a line cycle indicated by the first synchronization signal,
• wherein the second synchronization signal
• indicates a first line cycle when the photosensitive member rotates at a first rotation speed, and
• indicates a second line cycle that is N times the first line cycle (N is an integer, 1<N) when the photosensitive member rotates at a second rotation speed that is 1/N of the first rotation speed,
• the synchronization signal generation unit is configured to generate the first synchronization signal indicating the first line cycle regardless of the rotation speed of the photosensitive member, and
• when the photosensitive member rotates at the second rotation speed, the transmission unit is configured to:
• transmit the data signal of one line to the at least one light-emitting chip during one line cycle out of N line cycles indicated by the first synchronization signal;
• and
• transmit a non-light-emission signal for not causing the plurality of light-emitting elements to emit light to the at least one light-emitting chip during remaining one or more line cycles out of the N line cycles.