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US 12,164,239 B2Granted
Image forming apparatus that modulates discharging light quantity
AssigneeCanon Kabushiki Kaisha
InventorShinri Watanabe
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a first image forming portion, a second image forming portion, 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 an emitted light quantity of a light emitting element is changed from a first light quantity to a second light quantity larger than the first light quantity and is changed from the second light quantity to a third light quantity larger than the second light quantity.
Claims20
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 portion 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 first 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 first 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 portion 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 second 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 second 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, and
- wherein the controller carries out control so that an emitted light quantity of the first light emitting element is changed from a first light quantity to a second light quantity greater than the first light quantity and an emitted light quantity of the second light emitting element is changed from a third light quantity to a fourth light quantity greater than the third light quantity.
4 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, a first developing portion 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 first 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 first 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 portion 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 second 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 second 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, and
- wherein the controller carries out control so that an emitted light quantity of the first light emitting element is changed from a first light quantity to a second light quantity less than the first light quantity and an emitted light quantity of the second light emitting element is changed from a third light quantity to a fourth light quantity less than the third light quantity.
4 more elements
Dependencies are inferred from the claim text.