IMAGE FORMING UNIT AND IMAGE FORMING APPARATUS

摘要

An image forming unit suppressing occurrences of jitters, includes an image carrier rotating by drive force transmitted via a first route to form an electrostatic latent image, and a developer carrier having an elastic layer carrying a developer on a surface thereof and rotating by drive force transmitted via a second route to develop the electrostatic latent image. The electrostatic latent image is developed with the developer under a development condition that, with the elastic layer of a thickness from 0.5 mm to 2.5 mm, the developer carrier is rotated with a circumferential speed ratio to the image carrier in a range from 1.10 to 1.45, or that, with the elastic layer of a thickness more than 2.5 mm but not more than 5.0 mm, the developer carrier is rotated with a circumferential speed ratio to the image carrier in a range from 1.10 to 1.24.

主权项

1. An image forming unit comprising:
an image carrier rotating by drive force transmitted via a first drive force transmission route and forming an electrostatic latent image on a surface thereof; and a developer carrier having an elastic layer carrying a developer on a surface thereof, rotating by drive force transmitted via a second drive force transmission route, and developing the electrostatic latent image with the developer, wherein the electrostatic latent image is developed with the developer under a development condition that, where the elastic layer of the developer carrier is set to have a thickness in a range from 0.5 mm to 2.5 mm, the developer carrier is rotated with a circumferential speed ratio with respect to the image carrier in a range from 1.10 to 1.45, or a development condition that, where the elastic layer of the developer carrier is set to have a thickness in a range more than 2.5 mm but not more than 5.0 mm, the developer carrier is rotated with a circumferential speed ratio with respect to the image carrier in a range from 1.10 to 1.24.