IMAGE FORMING APPARATUS AND DEVELOPING DEVICE

Developing device and image forming apparatus including same

Developing apparatus having a rib portioned conveyance screw

DEVELOPING DEVICE

Image forming apparatus having removable developing units

Sensor device, toner concentration detection method and image forming apparatus

Sensor, method of detecting magnetic substance, and image forming apparatus

Image forming apparatus with forced supply mode for forcedly supplying toner

Image forming apparatus that performs developer replenishment

Magnetic permeability detector, developing device, image forming apparatus, and oscillation signal frequency calculation method therefor

Magnetic permeability detector, developing device, image forming apparatus, and oscillation signal frequency calculation method therefor

Image forming apparatus to which toner container capable of containing two toners having different magnetic permeabilities is capable of being attached

Toner level sensing using rotatable magnets having varying angular offset

Differential transformer magnetic permeability sensor

Image forming apparatus supplying toner based on toner density of developer contained in containing unit and method for controlling image forming apparatus

Magnetic permeability detector, developing device, image forming apparatus, and oscillation signal frequency calculation method therefor

Image forming apparatus

Image forming apparatus that performs gradation correction

Differential transformer type magnetic sensor and image forming apparatus

Image forming apparatus for deciding a magnetic toner amount on the basis of an output value and a standard value

Image forming device and method of adjusting density of formed image