Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorHiroyuki Kidaka
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes an image-bearing member, which is charged by a charge voltage in which direct and alternating-current voltages are superposed on each other. A toner image is formed on the charged image-bearing member. A current flowing through the charging member is detected when the charge voltage is applied to the charging member. A current, in a frequency band including a discharge current component, is extracted from the detected current. The alternating-current voltage is adjusted based on the current extracted by an extraction unit. Environmental information is acquired. Based on the environmental information acquired by an acquisition unit, a frequency band for extraction performed by the extraction unit is set.
Claims10
An image forming apparatus comprising:
- an image-bearing member;
- a charging member configured to charge the image-bearing member by receiving a charge voltage in which a direct-current voltage and an alternating-current voltage are superposed on each other;
- a power source configured to apply a voltage to the charging member;
- a toner-image forming unit configured to form a toner image on the image-bearing member charged by the charging member;
- a detector configured to detect a current flowing through the charging member when the power source applies the charge voltage to the charging member;
- an extraction unit configured to extract, from the current detected by the detector when the charge voltage is applied to the charging member, a current in a frequency band including a discharge current component;
- an adjustment unit configured to adjust the alternating-current voltage based on the current extracted by the extraction unit;
- an acquisition unit configured to acquire environmental information;
- and
- a setting unit configured to set, based on the environmental information acquired by the acquisition unit, a frequency band for extraction performed by the extraction unit.
A method for an image forming apparatus having an image-bearing member, the method comprising:
- charging, via a charging member, the image-bearing member by receiving a charge voltage in which a direct-current voltage and an alternating-current voltage are superposed on each other;
- applying a voltage to the charging member from a power source;
- forming, via a toner-image forming unit, a toner image on the image-bearing member charged by the charging member;
- detecting, via a detector, a current flowing through the charging member when the power source applies the charge voltage to the charging member;
- extracting, via an extraction unit and from the current detected by the detector when the charge voltage is applied to the charging member, a current in a frequency band including a discharge current component;
- adjusting, via an adjustment unit, the alternating-current voltage based on the current extracted by the extraction unit;
- acquiring, via an acquisition unit, environmental information;
- and
- setting, via a setting unit and based on the environmental information acquired by the acquisition unit, a frequency band for extraction performed by the extraction unit.
Dependencies are inferred from the claim text.