Light-emitting device and image forming apparatus

A light-emitting device comprising:

• a plurality of light-emitting elements which emit light with light intensities according to levels of driving currents;
• a plurality of current generation circuits which are provided in correspondence with the plurality of light-emitting elements, each current generation circuit having a plurality of current sources, and each current generation circuit combining currents output from the plurality of current sources to output the combined currents as the driving currents;
• and
• a plurality of memories which store control signals, each of the control signals controlling the current output from one of the plurality of current sources;
• wherein levels of the currents of the plurality of current sources are different from one another,
• wherein one first memory of the plurality of memories is connected to one current source of the plurality of current sources of one current generation circuit of the plurality of current generation circuits in order to provide one control signal to only the one current source of the one current generation circuit, and
• wherein one second memory of the plurality of memories is connected to one current source of the plurality of current sources of at least two current generation circuits of the plurality of current generation circuits in order to provide one control signal to the one current source of the at least two current generation circuits.