Image forming apparatus
AssigneeKYOCERA Document Solutions Inc.
InventorsKazuhiro NAKACHI, Satoshi SUNAYAMA
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Abstract
A mode control section forms a plurality of reference toner images having different densities on a photosensitive drum, where the frequency of an alternating-current voltage of a development bias is varied with a potential difference between direct-current voltages of a development roller and the photosensitive drum maintained constant, generates a reference straight line indicating a relationship between a toner amount of each reference toner image obtained by converting the density of the measured reference toner image into weight, and a representative value of current values of a development current measured during formation of the reference toner image, and acquires the amount of electrostatic charge of toner using the reference straight line.
Claims5
An image forming apparatus comprising:
- an image bearing member configured to rotate, having a surface on which an electrostatic latent image is formed, and configured to bear a toner image obtained by transforming the electrostatic latent image into a visible image;
- an exposure device configured to form the electrostatic latent image on the surface of the image bearing member;
- a development roller disposed facing the image bearing member, and
- configured to rotate, bear a developer containing toner and carrier on a peripheral surface thereof, and supply the toner to the image bearing member and thereby form the toner image;
- a development bias applying section configured to apply a development bias including a combination of a direct-current voltage and an alternating-current voltage to the development roller;
- a density measuring section configured to measure a density of the toner image;
- a current measuring section configured to measure a current value of a development current flowing between the image bearing member and the development roller;
- and
- an amount-of-electrostatic charge acquiring section, wherein
- the amount-of-electrostatic charge acquiring section executes a reference toner image developing operation of controlling the exposure device and the development bias applying section to form a plurality of reference toner images having different densities on the image bearing member, where the frequency of the alternating-current voltage of the development bias is varied with a potential difference between direct-current voltages of the development roller and the image bearing member maintained constant,
- a reference straight line generating operation of generating a reference straight line indicating a relationship between a toner amount of each reference toner image obtained by converting the density of the reference toner image measured by the density measuring section into weight, and a representative value of current values of the development current measured by the current measuring section during formation of the reference toner image, and
- an amount-of-electrostatic charge acquiring operation of acquiring the amount of electrostatic charge of the toner using the reference straight line.
Dependencies are inferred from the claim text.