Image forming apparatus that includes an eraser drive circuit

An image forming apparatus comprising:

• a plurality of image formation units each of which includes
• an image carrying member in which a photosensitive layer is formed on a surface,
• a charging device that charges the surface of the image carrying member,
• a development device that develops an electrostatic latent image formed on the image carrying member into a toner image and
• a static eliminator that eliminates a residual charge on the image carrying member, and which form the toner images of a plurality of colors;
• an eraser drive circuit that drives light emitting diodes included in the static eliminators;
• a static elimination voltage power supply that applies a drive voltage to the eraser drive circuit;
• and
• a control unit that controls the eraser drive circuit and the static elimination voltage power supply,
• wherein the eraser drive circuit includes
• a monochrome drive circuit that drives only the light emitting diode included in the static eliminator provided in the image formation unit in which the toner image of black is formed and
• a color drive circuit that drives the light emitting diodes included in the static eliminators provided in the image formation units in which the toner images of all the colors including black are formed, and
• the eraser drive circuit includes a common constant current drive circuit as a part of the monochrome drive circuit and the color drive circuit.