Patent ID: 8145103

Claim:
An image formation device, comprising: a developer holding body having a developer holding surface which is configured to hold developer thereon and is located to be parallel with a main scanning direction; and a developer supply unit configured to supply the developer to a position facing the developer holding surface by carrying the developer in a developer transport direction intersecting with the main scanning direction through use of effect of an electric field, the developer supply unit comprising a plurality of carrying electrodes each of which is formed to have a longer side extending along the main scanning direction, the plurality of carrying electrodes being arranged along the developer transport direction to carry the developer when a drive voltage is applied to the plurality of carrying electrodes, wherein the developer supply unit has a developer carrying area on which the developer is carried, and the developer carrying area is formed such that, in the main scanning direction, the developer carrying area becomes narrower from an upstream side in the developer transport direction toward the position along the developer transport direction.