Patent ID: 7580659

Claim:
A developing device comprising: a developer carrier configured to carry and convey a developer, the developer carrier, to which an alternating-current bias is applied, developing an electrostatic image formed on an image carrier with the developer, the developer carrier being disposed so as to face the image carrier; a development frame configured to support the developer carrier; a developer flying regulation member including a first end supported by the development frame and a second end disposed within a developing area between the developer carrier and the image carrier; and a development-noise regulation member including a third end supported by the development frame and a fourth end being in contact with the image carrier, the fourth end being located upstream of the second end of the developer flying regulation member and downstream of a position on the image carrier where the electrostatic image is formed in a direction of movement of a surface of the image carrier, the development-noise regulation member having a natural frequency being smaller than a frequency of an alternating-current bias.