Image forming apparatus

Details Image forming apparatus Image forming apparatus

2007-05-15

2007-05-15

Grainger, Quana (Department: 2852)

Electrophotography

Image formation

Transfer

Reexamination Certificate

active

10304050

ABSTRACT:
An image forming apparatus comprises: an image transfer carrying means18having flexibility and having an endless sleeve-like shape; a plurality of image forming means7which are arranged along the image transfer carrying means18such that respective image carriers17thereof are in contact with the image transfer carrying means18,each image forming means7comprising a latent image forming means6for forming a latent image on the image carrier and a developing means for developing the latent image formed on the image carrier; and transfer bias applying means16which are disposed on the back of the image transfer carrying means at positions where the respective image carriers are in contact with the image transfer carrying means for applying transfer bias. The image transfer carrying means18is laid around at least two rollers with certain tension and is positioned to be in contact with the image carriers17to have predetermined nip width therebetween and each transfer bias applying means abuts the image transfer carrying means18to have a contact area narrower than the nip width for applying transfer bias. At gradually increasing spaces at the entrance end and the exit end of each nip portion of the image transfer carrying means, even with high transfer bias voltage, the discharge phenomenon and an undesired phenomenon of toner image scattering from predetermined positions are prevented, thus preventing the deterioration of image quality.

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