PURPOSE: To make a titled device small in size, to make it unnecessary to execute an adjustment of high accuracy, and to improve a picture quality by constituting said device so that a photosensitive body covered with a non-magnetic material, and a magnet which has carried a developer layer on the surface are opposed to each other by providing a prescribed gap on the surface of an uneven magnetic material.
CONSTITUTION: An uneven magnetic material surface 2 of a photosensitive body 1 is covered with a non-magnetic material, and a magnetic carrier 8 is adhered to the surface of a magnet 7 which has been opposed by providing a prescribed gap. When a latent image on the photosensitive body 1 electrified to minus is positioned at a magnetic carrier 8 part, an electric field is generated, an insulating toner 9 electrified to plus of the carrier 8 part adheres to the latent image and its development can be executed. Between the photosensitive body 1 and the magnet 7, a magnetic field is generated, therefore, a developer layer is brought into contact under pressure in a state that bristles have been raised, and it becomes unnecessary to adjust with high accuracy a gap between the photosensitive body and the magnet. Also, since the non- magnetic material is covered, the magnetic carrier scarcely adheres to the photosensitive body, and the picture quality can be improved by stirring the developer by the uneven surface.
TERADA HIROSHI
YAMAZAKI FUMIO
