US 7,925,174 B2 · Image forming apparatus

Abstract

An image forming apparatus includes a latent image carrier, a developing unit to develop a latent image on the image carrier with developer including toner and carrier, a developer bearing member, a first detector to detect a toner adhesion amount per unit area of a toner image developed by the developing unit, a second detector to detect humidity, and a controller to calculate an index indicating toner chargeability of the carrier based on detection results of the toner adhesion amount obtained by the first detector and perform a given control process based on calculation results thereof and including a data storage unit to store an algorithm to correct the index to a specific value according to a specific humidity, based on detection results of the humidity obtained by the second detector. The controller corrects the index obtained based on the amount of toner adhesion based on the algorithm.

Claims10

Dependent claims

An image forming apparatus, comprising:

a latent image carrier to carry a latent image on a surface thereof;
a developing unit to develop the latent image with developer including toner and carrier into a toner image;
a developer bearing member to carry the developer;
a first detector to detect an amount of toner adhesion per unit area of the toner image developed by the developing unit;
a second detector to detect humidity;
and
a controller to calculate an index that indicates toner chargeability of the carrier of the developer contained in the developing unit based on detection results of the amount of toner adhesion obtained by the first detector and perform a given control process based on calculation results thereof,
the controller including a data storage unit to store an algorithm to correct the index to a specific value according to a specific humidity, based on detection results of the humidity obtained by the second detector,
the controller correcting the index obtained based on the amount of toner adhesion based on the algorithm.

6 more elements

An image forming apparatus, comprising:

a latent image carrier to carry a latent image on a surface thereof;
a developing unit to develop the latent image with developer including toner and carrier;
a developer bearing member to carry the developer;
a first detector to detect an amount of toner adhesion per unit area with respect to a toner image developed by the developing unit;
a second detector to detect humidity;
and
a controller to calculate an index that indicates toner chargeability of the carrier of the developer contained in the developing unit based on detection results of the amount of toner adhesion obtained by the first detector and perform a given control process based on calculation results thereof,
the controller including a data storage unit to store an algorithm that indicates a relation between the humidity and a normal value of the index,
the controller specifying and determining the normal value that corresponds to the detection results of the humidity obtained by the second detector based on the algorithm stored in the data storage unit and performing the given control process based on a difference between the determination results and the calculation results of the index.

6 more elements

Dependencies are inferred from the claim text.

Image forming apparatus

Life of this patent

Image forming apparatus

Life of this patent

Abstract

Claims10