Patent ID: 6856774

Claim:
A developing device for developing a latent image formed on a latent image carrier with a developer, comprising: a casing configured to accommodate the developer including toner and magnetic particles, the casing including an opening facing the latent image carrier; a non-magnetic developer carrier configured to rotate and carry the developer to a developing region where the developer carrier faces the latent image carrier, and disposed such that a part of the developer carrier is exposed to the outside through the opening of the casing; a magnetic field generating device disposed in the developer carrier to generate magnetic fields, the magnetic field generating device including a first magnetic pole generating a magnetic field that causes the developer to rise on the developer carrier in a form of a magnet brush in the developing region, and a second magnetic pole generating a magnetic field at a downstream side of the first magnetic pole in a direction of rotation of the developer carrier; a toner-scattering restraining device provided on an end portion of the casing at a downstream side of the developing region in the direction of rotation of the developer carrier such that the toner-scattering restraining device faces the latent image carrier and reduces a gap between the developer carried on the developer carrier and the end portion of the casing, so as to restrain the toner from scattering from the gap; and a magnetic member provided on a side of the toner-scattering restraining device facing the latent image carrier, wherein a peak of a magnetic flux density set by the second magnetic pole in its normal direction is located at a position outside of the opening of the casing.