Patent ID: 7792440

Claim:
A development system comprising: a developer carrier member that carries a developer; a developer supply roller that supplies the developer carrier member with the developer; a developer container that stores the developer; a toner compression roller that contacts with the developer carrier member and presses toner against the developer carrier member, the toner included in the developer; input means for inputting a type of a recording medium; and density sensing means for sensing a density of the toner in the developer in the developer container, wherein a condition for the toner compression roller is changed depending on the density of the toner in the developer in the developer container or depending on the type of the recording medium, and depending on the type of the recording medium, a contact angle or contact pressure of a regulation blade for regulating a quantity of the developer to be supplied for the developer supply roller is changed, and a rotation speed and/or bias of the toner compression roller are changed.