| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve such a problem that when a toner patch Q is formed by a prescribed patch Vcont in a decreased amount of charged toner, the density of the toner patch Q is higher than a prescribed density, and consequently toner is not supplied until the amount of charged toner recovers. <P>SOLUTION: When controlling a toner density by a patch test ATR in a decreased amount of charged toner, the image forming apparatus controls a patch Vcont for forming a toner patch according to the decreased amount of charged toner. Each time images are formed with a prescribed number of sheets, a toner patch Q is formed. If the density of the toner patch Q is different from the prescribed density, an amount of toner to be supplied is controlled on the basis of the density of the toner patch Q and the prescribed density. In addition, the patch Vcont is controlled so that the toner patch Q may be formed at the prescribed density. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
