Tandem type color image forming device

An image forming device, wherein:

• a plurality of toner image forming means for forming and transferring toner images onto a transfer medium are disposed side by side along a transport or moving direction of said transfer medium so as to allow the plurality of toner images to be successively transferred one over another with respect to said transfer medium, and
• said plurality of toner image forming means have transfer means for transferring the formed toner images to the transfer medium, and
• a transfer voltage of the transfer means in toner image forming means on a downstream side of the transport or moving direction is set to be lower than a transfer voltage of the transfer means in toner image forming means on an upstream side.

An image forming device, wherein:

• a plurality of toner image forming means for forming and transferring a toner image onto a transfer medium are disposed side by side along a transport or moving direction of said transfer medium so as to allow a plurality of toner images to be successively transferred one over another with respect to said transfer medium, and
• said plurality of toner image forming means include an image carrier for carrying an electrostatic latent image, and developing means for developing the electrostatic latent image which is carried by said image carrier, and
• a developing potential of the developing means in toner image forming means on a downstream side in the transport or moving direction is set to be lower than a developing potential of the developing means in toner image forming means on an upstream side.

An image forming device, wherein:

• a plurality of toner image forming means for forming and transferring toner images onto a transfer medium are disposed side by side along a transport or moving direction of said transfer medium so as to allow the plurality of toner images to be successively transferred one over another with respect to said transfer medium, and
• a particle size of toner which is used in toner image forming means on a downstream side in the transport or moving direction is set to be larger than a particle size of toner which is used in toner image forming means on an upstream side,
• wherein as said plurality of the toner image forming means are provided one or more chromatic color toner image forming means for forming a toner image having a chromatic color, and only one black toner image forming means for forming a toner image having a black color, and said transfer medium is an intermediate transfer belt having a shape of a belt and being suspended in a horizontal direction inside a main body, and said chromatic color toner image forming means are disposed side by side on one side of said intermediate transfer belt, and said black toner image forming means is disposed on the other side of said intermediate transfer belt, alone and on a most downstream side of all the toner image forming means.