Abstract:
An image forming apparatus includes an image forming portion, an exposure device, an image density sensor, and a control portion. The control portion can, by adjusting the development voltage based on the image density of a reference image and the amount of exposure from the exposure device, perform image density correction to adjust the image density. The control portion predicts the toner charge amount based on a formation condition of the reference image and the image density of the reference image and determines the timing of performing the image density correction next time based on the rate of change of the toner charge amount calculated using a first toner charge amount predicted when the image density correction was performed last time, a second toner charge amount predicted when the image density correction is performed this time, and the interval between the image density correction performed last time and this time.
Abstract:
A developing device includes a housing for housing therein a developer containing toner and magnetic carrier, and a first sensor including an oscillation circuit and a coil board which is part of the oscillation circuit and on which a coil pattern is formed. A fitting portion formed by recessing an outer surface of the housing is provided in the housing so as to allow the coil board to be fitted at a position closer to the developer than the outer surface of the housing. The coil board is fitted into the fitting portion.
Abstract:
A developing device includes N number of containers, N number of conveying members, N number of first sensors, stirring portions, a switching unit, and a control unit. The N number of conveying members stir and convey respective developers inside the N number of containers. The N number of first sensors are located at the N number of containers to detect toners remaining amount inside of the N number of containers. The stirring portions are located at the respective N number of conveying members to stir the developers at detecting regions opposed to detecting surfaces of the N number of first sensors by rotations of the N number of conveying members. The switching unit selects any one of outputs of the N number of first sensors to output. The control unit receives the selected output to detect the remaining amounts of the developers inside the N number of containers.