Image forming apparatus which calculates and corrects skew error

摘要

An image forming apparatus includes: Photoreceptors; an image carrier; a plurality of light emitting element arrays each configured to emit a light beam to a corresponding one of the photoreceptors independently; an angle adjustment unit to adjust a mounting angle of the light emitting element arrays to a frame of the image forming apparatus; a pattern forming unit to form a positional error correction pattern of each color on the image carrier; a optical detector to detect the correction pattern formed on the image carrier; a positional error calculation unit to calculate a printing skew error and a main scanning scaling error of the light emitting element arrays based on the correction pattern detected by the optical detector; a skew correction unit to correct the printing skew error detected by the positional error calculation unit; and further a main scanning scaling error correction unit.

主权项

1. An image forming apparatus comprising:
photoreceptors; an image carrier; a plurality of light emitting element arrays each to emit a light beam onto a corresponding one of the photoreceptors independently; an angle adjuster to adjust a mounting angle of the light emitting element arrays relative to a frame of the image forming apparatus; a pattern forming unit to form a positional error correction pattern of each color on the image carrier; an optical detector to detect the correction pattern formed on the image carrier; a positional error calculator to calculate a printing skew error and a main scanning scaling error of the light emitting element arrays based on the correction pattern detected by the optical detector; a skew corrector to correct the printing skew error calculated by the positional error calculator after adjustment of the mounting angle of the light emitting element arrays by the angle adjuster; and a main scanning scaling error corrector to correct the main scanning scaling error by changing the mounting angle of the light emitting element arrays in the main scanning direction using the angle adjuster based on the main scanning scaling error.