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US 11,960,219 B2Granted
Image forming apparatus for forming images on sheets by using toner
AssigneeCanon Kabushiki Kaisha
InventorsShohei Okumura, Shinya Suzuki, Masahiro Tsujibayashi
Life of this patent
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Abstract
An image forming apparatus controls a generation circuit to modulate a DC component of a developing voltage based on a first correction component such that a density unevenness is reduced. The image forming apparatus further restricts the first correction component for modulating the DC component of the developing voltage such that fogging of toner that may occur on a non-exposure region which is not exposed by an exposure unit and adhesion to a photosensitive member of carrier included in a developer are reduced.
Claims12
An image forming apparatus comprising:
- a photosensitive member;
- a charging device configured to charge a surface of the photosensitive member to be uniformly charged;
- an exposure device configured to form an electrostatic latent image by exposing the surface of the photosensitive member;
- a developing unit having a developing rotary member that forms a toner image onto the surface of the photosensitive member by causing toner included in a developer to adhere to the electrostatic latent image;
- a transfer unit configured to transfer the toner image onto a sheet or an intermediate transfer member;
- a first sensor configured to detect a density unevenness of the toner image;
- a generation circuit configured to generate a developing voltage, which is a developing bias applied to the developing rotary member, that includes a direct current (DC) component and an alternating current (AC) component, and a charging voltage supplied to the charging device;
- and
- a controller configured to control the generation circuit to modulate the DC component of the developing voltage based on a first correction component such that the density unevenness is reduced,
- wherein the controller is further configured to restrict the first correction component for modulating the DC component of the developing voltage, such that fogging of toner that may occur on a non-exposure region which is not exposed by the exposure unit and adhesion to the photosensitive member of carrier included in the developer, which is a source of the toner image, are reduced.
7 more elements
An image forming apparatus comprising:
- a photosensitive member;
- a charging device configured to charge a surface of the photosensitive member to be uniformly charged;
- an exposure device configured to form an electrostatic latent image by exposing the surface of the photosensitive member;
- a developing unit having a developing rotary member that forms a toner image onto the surface of the photosensitive member by causing toner included in a developer to adhere to the electrostatic latent image;
- a transfer unit configured to transfer the toner image onto a sheet or an intermediate transfer member;
- a sensor configured to detect density unevenness of the toner image;
- a generation circuit configured to generate a developing voltage, which is a developing bias applied to the developing rotary member, that includes a direct current (DC) component and an alternating current (AC) component, and a charging voltage supplied to the charging device;
- and
- a controller configured to control the generation circuit to modulate the charging voltage to be modulated based on a correction component such that the density unevenness is reduced,
- wherein the controller is further configured to restrict the correction component such that fogging of toner that may occur on a non-exposure region which is not exposed by the exposure unit and adhesion to the photosensitive member of carrier included in the developer, which becomes the source of the toner image, are reduced.
7 more elements
Dependencies are inferred from the claim text.