Image forming device

An image forming device comprising:

• a plurality of element arrays that each consist of a plurality of light emitting elements arranged in a main scanning direction, the element arrays being arranged in a sub scanning direction;
• a photoreceptor whose surface moves relative to the light emitting elements in the sub scanning direction;
• a controller that outputs a control voltage instructing a light emission amount for each of the light emitting elements;
• and
• a plurality of drivers that correspond one-to-one with the light emitting elements, and each supply a drive current to a corresponding one of the light emitting elements according to the control voltage, thus causing the light emitting element to emit light to expose the moving surface of the photoreceptor, wherein
• array intervals L between the element arrays in the sub scanning direction satisfy
• (D/2)×(V/F)−((V/F)×0.1)≤L≤(D/2)×(V/F)+((V/F)×0.1) (1)
• where F expresses frequency of an AC noise to be superimposed on the control voltage, V expresses a system speed that is a moving speed of the surface of the photoreceptor relative to the light emitting elements, and D is an odd number;
• wherein the array intervals L satisfy
• L=(D/2)×(V/F) (2).