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US 6,593,048 B2Granted
Two-component developer, and image forming apparatus and image forming method using the developer
AssigneeRicoh Company, Ltd.
InventorsFumihiro Sasaki, Yasuaki Iwamoto, Hiroaki Matsuda, Hiroshi Nakai, Hiroto Higuchi, Hyou Shu, Maiko Kondo
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Abstract
A two-component developer includes at least a magnetic toner and a magnetic carrier. The magnetic toner has magnetic particles coated with a carbon black layer. The magnetic toner adheres to the magnetic carrier due to the magnetic interaction.
Claims20
A two-component developer comprising:
- a magnetic toner including magnetic particles coated with a carbon black layer;
- and
- a magnetic carrier configured to carry the magnetic toner on a surface thereof.
A developer container, comprising:
- a first compartment configured to store a magnetic toner including magnetic particles coated with a carbon black layer;
- and
- a second compartment configured to store a magnetic carrier configured to carry the magnetic toner on a surface thereof.
An image forming apparatus comprising:
- a toner container including a magnetic toner with magnetic particles coated with a carbon black layer, and configured to supply the magnetic toner to a developer carrier;
- a developer container including a magnetic carrier configured to carry the magnetic toner on a surface thereof and in which the magnetic toner is mixed with the magnetic carrier so to create a two-component developer;
- a first regulating member configured to control a volume of the two-component developer transported by the developer carrier;
- and
- a second regulating member arranged to border a region with the developer carrier, and configured to regulate how much magnetic toner is transferred to the developer container,
- wherein the second regulating member changes a mixing ratio of the magnetic carrier and magnetic toner, according to a change of a magnetic toner concentration of the two-component developer on the developer carrier.
3 more elements
An image forming method comprising:
- forming a latent image on a photoreceptor;
- and
- developing the latent image by a developer,
- wherein the developer is a two-component developer comprising:
- a magnetic toner including magnetic particles coated with a carbon black layer;
- and
- a magnetic carrier configured to carry the magnetic toner on a surface thereof.
4 more elements
Dependencies are inferred from the claim text.