Image forming apparatus

An image forming apparatus comprising:

• a photoconductor;
• an exposure device including a chip having a first light-emitting element array and a second light-emitting element array, the first light-emitting element array including a plurality of light-emitting elements disposed in a first direction that is parallel to a rotational axis direction of the photoconductor, the second light-emitting element array including a plurality of light-emitting elements disposed in the first direction, the first light-emitting element array and the second light-emitting element array being disposed sequentially in a second direction orthogonal to the first direction, the exposure device being configured to perform multiple exposure with the second light-emitting element array of an exposure position of the photoconductor exposed with the first light-emitting element array;
• and
• a controller configured to transmit, to the exposure device, a signal for controlling the exposure device,
• wherein the exposure device:
• sets a first pulse signal for light emission of the first light-emitting element array, based on a first delay time from an input timing of a line synchronizing signal to a first start timing at which light emission starts and a first pulse width from the first start timing to a first termination timing at which the light emission terminates before a next input timing of the line synchronizing signal,
• sets a second pulse signal for light emission of the second light-emitting element array, based on a second delay time, different from the first delay time, from the input timing of the line synchronizing signal to a second start timing at which light emission starts and a second pulse width, identical to the first pulse width, from the second start timing to a second termination timing at which the light emission terminates before the next input timing of the line synchronizing signal, and
• starts and terminates light emission of each of the first light-emitting element array and the second light-emitting element array according to the set first pulse signal and second pulse signal.