Patent ID: 7561815

Claim:
A development system comprising: an image forming section including a development roller that carries developer, a developer supplying roller that supplies the developer to the development roller, a developer container that supplies the developer to the developer supplying roller, a photoconductor on which a developed image is formed with the developer carried by the development roller, and a transfer means that transfers the developed image on the photoconductor; a developer concentration adjusting section including a toner tank that reserves developer of which concentration is higher than that of the developer in the developer container, a liquid carrier tank that reserves liquid carrier, and a developer concentration adjusting tank into which the high-concentration developer is fed from the toner tank and the liquid carrier is fed from the liquid carrier tank; a paper type input means that inputs a paper type; and a developer concentration adjustment controlling section that controls development conditions depending on the paper type inputted by the paper type input means.