Patent ID: 6172700
Filing Date: 2001-01-09
Classification: B41J,G06K,H04N

Abstract:
A writing device for an image forming apparatus, comprising:a light emitter array composing a plurality of light emitter chips arranged in an array and each having a plurality of light emitters also arranged in an array, for writing an image on a photoconductive element line by line by scanning said photoconductive element;light emitter array control means for controllably driving each of said plurality of light emitters to output light in accordance with image data;a halftone area detector configured to detect if image data at intervals between said light emitter chips is halftone image data; anddata correcting means for correcting, in selected image data from among the image data input to said light emitter array control means, a quantity of light output by selected of the plurality of light emitters corresponding to the selected image data based on whether the selected of the plurality of light emitters are positioned at the intervals between said light emitter chips and based on said halftone area detector detecting that the image data at the intervals between said light emitter chips is of halftone image data.