SINGLE COMPONENT DEVELOPING DEVICE

PURPOSE:To execute clear development without any fogging even when an alternating current bias is not impressed by forming the thin layer of a developing agent on a developing sleeve by a fixed magnet and vibrating the developing agent by a rotating magnet. CONSTITUTION:When a developing sleeve 3 is rotated in the clockwise direction, a developing powder 7 transported by the developing sleeve 3 rises one time along the magnetic line from an opposite magnet 6 toward a doctor blade 5 between the doctor blade 5 and the opposite magnet 6, and thereafter, the powder is fallen in the proceeding direction and the thin layer is formed. Between a magnet roller 4 and a photosensitive body drum 1, each time the magnet roller 4 is rotated, the developing powder 7 is caused to stand like ears and to fall repeatedly and vibrates. Consequently, the developing powder 7, in which the thin layer is formed by the doctor blade 5, vibrates at the developing area of the photosensitive body drum 1 and is stuck to the static latent image by a Coulomb force.