An image formation apparatus includes an image carrier and a toner carrier having a concave portion arrayed in a regular pattern on its surface. A latent image that is carried on the image carrier is developed by toner carried in the concave portion by applying a development voltage to the toner carrier....http://www.google.de/patents/US7945194?utm_source=gb-gplus-sharePatent US7945194 - Image forming apparatus and image forming system reducing electrical discharge
