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 humidity of an inside of the apparatus is a first humidity, 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 humidity of the inside of the apparatus is a second humidity lower than the first humidity, a developing bias voltage in which the rest portion is not included or is shorter than the rest portion when the humidity of the inside of the apparatus is the first humidity.
Claims10
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 in the form of a DC component biased with an AC component;
- 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 humidity of an inside of said apparatus is a first humidity, 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 humidity of the inside of said apparatus is a second humidity lower than the first humidity, a developing bias voltage in which the rest portion is not included or is shorter than the rest portion when the humidity of the inside of said apparatus is the first humidity.
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 in the form of a DC component biased with an AC component;
- 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 surface resistivity of said photosensitive member is a first value, 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 surface resistivity of said photosensitive member is a second value larger than the first value, a developing bias voltage in which the rest portion is not included or is shorter than the rest portion when the surface resistivity of said photosensitive member is the first value.
Dependencies are inferred from the claim text.