Patent ID: 6185007
Filing Date: 2001-02-06
Classification: H04N

Abstract:
An image forming apparatus comprising:an image reading unit configured to read a document image by way of optically reading the document image;an image processing unit configured to convert an input image signal from the image reading unit and to output the converted input image signal as an output image signal by use of an image signal conversion table incorporated in said image processing unit;a writing unit configured to write information on an image carrier according to said output image signal;an image forming unit comprising said image carrier and configured to form an image on a transfer material;a gradation pattern image signal generating unit configured to generate a plurality of gradation patterns to be recorded on said transfer material;a unit configured to prepare and select an image signal conversion table according to a signal read by said image reading unit from said plurality of gradation patterns recorded on the transfer material; anda detecting unit configured to detect a relation between a surface potential and a toner deposition rate on the image carrier; wherein a write signal level for a gradation pattern formed on said transfer material is changed according to a result of detection by said detecting unit.