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US 2017/0322503 A1Published application
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorHiroyuki Kidaka
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a photosensitive member, a charging member, an exposure member, a rotatable developer carrying member, a voltage source, and a controller configured to control the voltage source so that when a thickness of the surface layer of the photosensitive member is a first thickness, a developing bias voltage including an oscillating portion having an oscillating voltage and a rest portion having a substantially constant voltage are alternately repeated is outputted and so that when the thickness of the surface layer of the photosensitive member is a second thickness smaller than the first thickness, a developing bias voltage in which the rest portion is not included or is shorter than the rest portion when the thickness of the surface layer is the first thickness.
Claims7
An image forming apparatus comprising:
- a photosensitive member including a photosensitive layer and a surface layer formed in an outer periphery side of said photosensitive layer;
- a charging member configured to electrically charge a surface of said photosensitive member by being supplied with a charging bias voltage;
- an exposure member configured to expose said photosensitive member to light to form an electrostatic latent image;
- a rotatable developer carrying member configured to carry a developer containing toner;
- a voltage source configured to apply, to said developer carrying member, a developing bias voltage including a DC component and an AC component to develop the electrostatic latent image on said photosensitive member with the toner;
- and
- a controller configured to control said voltage source so that when a thickness of the surface layer of said photosensitive member is a first thickness, a developing bias voltage including an oscillating portion having an oscillating voltage and a rest portion having a substantially constant voltage are alternately repeated is outputted and so that when the thickness of the surface layer of said photosensitive member is a second thickness smaller than the first thickness, a developing bias voltage in which the rest portion is not included or is shorter than the rest portion when the thickness of the surface layer is the first thickness.
4 more elements
An image forming apparatus comprising:
- a photosensitive member including a photosensitive layer and a surface layer formed in an outer periphery side of said photosensitive layer;
- a charging member configured to electrically charge a surface of said photosensitive member by being supplied with a charging bias voltage;
- an exposure member configured to expose said photosensitive member to light to form an electrostatic latent image;
- a rotatable developer carrying member configured to carry a developer containing toner;
- a voltage source configured to apply, to said developer carrying member, a developing bias voltage including a DC component and an AC component to develop the electrostatic latent image on said photosensitive member with the toner;
- and
- a controller configured to control said voltage source so that when a current application time of the charging bias voltage is a first length, a developing bias voltage including an oscillating portion having an oscillating voltage and a rest portion having a substantially constant voltage are alternately repeated is outputted and so that when the current application time is a second length longer than the first length, a developing bias voltage in which the rest portion is not included or is shorter than the rest portion when the current application time is the first length.
4 more elements
An image forming apparatus comprising:
- a photosensitive member including a photosensitive layer and a surface layer formed in an outer periphery side of said photosensitive layer;
- a charging member configured to electrically charge a surface of said photosensitive member by being supplied with a charging bias voltage;
- an exposure member configured to expose said photosensitive member to light to form an electrostatic latent image;
- a rotatable developer carrying member configured to carry a developer containing toner;
- a voltage source configured to apply, to said developer carrying member, a developing bias voltage including a DC component and an AC component to develop the electrostatic latent image on said photosensitive member with the toner;
- and
- a controller configured to control said voltage source so that when an electrostatic capacity of the surface layer of said photosensitive member is a first electrostatic capacity, a developing bias voltage including an oscillating portion having an oscillating voltage and a rest portion having a substantially constant voltage are alternately repeated is outputted and so that when the electrostatic capacity of the surface layer of said photosensitive member is a second electrostatic capacity larger than the first electrostatic capacity, a developing bias voltage in which the rest portion is not included or is shorter than the rest portion when the electrostatic capacity of the surface layer is the first electrostatic capacity.
4 more elements
Dependencies are inferred from the claim text.