Exposure device and image forming apparatus

摘要

An exposure device, which emits light according to a gray level of image data, includes plural light emitting element lines arranged at different positions in a sub scanning direction, a number of the light emitting element lines being a number of bits representing a number of gray levels. Each of the light emitting element lines includes plural light emitting elements arranged in a line in a direction parallel to a main scanning direction, the light emitting elements numbers of layers of organic electro-luminescence light emitting elements being the same. The numbers of layers of the organic electro-luminescence light emitting elements laminated in the light emitting element lines, which are arranged at different positions in the sub scanning direction, are different from each other.

主权项

1. An exposure device, which emits light according to a gray level of image data, comprising:
a plurality of light emitting element lines arranged at different positions in a sub scanning direction, the number of the light emitting element lines corresponding to a number of bits for representing gray levels, each of the light emitting element lines including:
a plurality of light emitting elements arranged in a line in a direction parallel to a main scanning direction, each light emitting element amongst the plurality of light emitting elements in the line having been laminated with a same number of layers of organic electro-luminescence light emitting elements as that of the others amongst the plurality of light emitting elements in the line, wherein the number of layers of the organic electro-luminescence light emitting elements laminating a light emitting element in one line amongst the plurality of light emitting element lines is different than that of a light emitting element in another line amongst the plurality of light emitting element lines.