Back to results
US 12,169,371 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoji An
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes first and second image forming portions, a power source portion, and a controller. The power source portion is constituted so that when the power source portion applies a charging voltage to a first charging member of the first image forming portion, the charging voltage is also applied to a second charging member of the second image forming portion. The controller carries out control so that a timing of a start of discharge of a first photosensitive drum in the first image forming portion is made earlier than a timing of a start of image formation by the first image forming portion and so that a timing of a start of discharge of a second photosensitive drum in the second image forming portion is made earlier than a timing of a start of image formation by the second image forming portion.
Claims11
An image forming apparatus comprising:
- a first image forming portion including a first photosensitive member, a first charging member configured to electrically charge a surface of the first photosensitive member, a first developing member configured to develop an electrostatic latent image formed on the first photosensitive member to form a toner image, a first transfer portion configured to transfer the toner image from the first photosensitive member onto a toner image receiving member, and a first discharging portion including a light emitting element and configured to discharge the surface of the first photosensitive member by irradiating the surface of the first photosensitive member with light emitted from the light emitting element;
- a second image forming portion including a second photosensitive member, a second charging member configured to electrically charge a surface of the second photosensitive member, a second developing member configured to develop an electrostatic latent image formed on the second photosensitive member to form a toner image, a second transfer portion configured to transfer the toner image from the second photosensitive member onto a toner image receiving member, and a second discharging portion including a light emitting element and configured to discharge the surface of the second photosensitive member by irradiating the surface of the second photosensitive member with light emitted from the light emitting element;
- a power source portion configured to apply a charging voltage to the first charging member and the second charging member;
- and
- a controller configured to control the first discharging portion and the second discharging portion,
- wherein the power source portion is constituted so that when the power source portion applies the charging voltage to the first charging member, the charging voltage is also applied to the second charging member,
- wherein the controller carries out control so as to change a timing of a start of discharge of the first photosensitive member and a timing of a start of discharge of the second photosensitive member by causing the power source portion to apply the charging voltage to the first charging member and the second charging member, and
- wherein the controller carries out control so that a timing of a start of discharge of the first photosensitive member in the first image forming portion is made earlier than a timing of a start of image formation by the first image forming portion and so that a timing of a start of discharge of the second photosensitive member in the second image forming portion is made earlier than a timing of a start of image formation by the second image forming portion.
5 more elements
An image forming apparatus comprising:
- a first image forming portion including a first photosensitive member, a first charging member configured to electrically charge a surface of the first photosensitive member in a first charging portion, a first developing member configured to develop an electrostatic latent image formed on the first photosensitive member to form a toner image, a first transfer portion configured to transfer the toner image from the first photosensitive member onto a toner image receiving member, and a first discharging portion including a light emitting element and configured to discharge the surface of the first photosensitive member by irradiating the surface of the first photosensitive member with light emitted from the light emitting element;
- a second image forming portion including a second photosensitive member, a second charging member configured to electrically charge a surface of the second photosensitive member in a second charging portion, a second developing member configured to develop an electrostatic latent image formed on the second photosensitive member to form a toner image, a second transfer portion configured to transfer the toner image from the second photosensitive member onto a toner image receiving member, and a second discharging portion including a light emitting element and configured to discharge the surface of the second photosensitive member by irradiating the surface of the second photosensitive member with light emitted from the light emitting element;
- a power source portion configured to apply a charging voltage to the first charging member and the second charging member;
- and
- a controller configured to control the first discharging portion and the second discharging portion,
- wherein the power source portion is constituted so that when the power source portion applies the charging voltage to the first charging member, the charging voltage is also applied to the second charging member,
- wherein the controller carries out control so as to change a timing when a first region discharged when discharge of the first photosensitive member is started reaches the first charging portion and a timing when a second region discharged when discharge of the second photosensitive member is started reaches the second charging portion, by causing the power source portion to apply the charging voltage to the first charging member and the second charging member, and
- wherein the controller carries out control so that a timing of a start of discharge of the first photosensitive member in the first image forming portion is made earlier than a timing of a start of image formation by the first image forming portion and so that a timing of a start of discharge of the second photosensitive member in the second image forming portion is made earlier than a timing of a start of image formation by the second image forming portion.
5 more elements
Dependencies are inferred from the claim text.