Patent ID: 9632461
Date: 2017-04-25
CPC Classifications: G03G

Claim:
1. An image forming apparatus, comprising: an image bearer; a toner image forming device to form a toner image on the image bearer; a nip forming device contacting the image bearer to form a transfer nip; a power source to output a transfer bias, in which an alternating current component is superimposed on a direct current component, to transfer the toner image from the image bearer onto a recording medium interposed in the transfer nip; a detector to detect at least one of a temperature and a humidity; and a controller operatively connected to the power source to control the power source to output the transfer bias in which the direct current component of the transfer bias has a smaller absolute value as at least one of the detected temperature and the detected humidity increases, wherein the controller controls the power source to output the transfer bias having a duty greater than 50% when transferring the toner image onto the recording medium, and the duty is expressed by (T−A)/T×100% when A denotes a duration of a peak voltage that transfers the toner image from the image bearer onto the recording medium and T denotes a time period of a cycle of the alternating current component of the transfer bias.