Two-component developer, developing device, and image forming apparatus
View Patent ↗A two-component developer includes toner and a magnetic carrier. The two-component developer is used in a developing device including a circular cylindrical developer transporting member that is disposed so as to be separated by 125 μm to 250 μm from a latent image carrier that rotates. The two-component developer is used so as to satisfy a condition in which a width of a region where a magnetic brush contacts a surface of the latent image carrier is in a range of from 1.0 mm to 2.25 mm, and a condition in which a developer density of the region where the magnetic brush contacts the surface of the latent image carrier is in a range of from 0.75×10 −6 to 1.50×10 −6 g/m 3 .
1. A two-component developer comprising:
toner; and
a magnetic carrier,
wherein the two-component developer is used in a developing device including a circular cylindrical developer transporting member that is disposed so as to be separated by 125 μm to 250 μm from a latent image carrier that rotates, the developer transporting member rotating so that a direction of movement of a portion thereof that approaches the latent image carrier is in an opposite direction,
the two-component developer is carried and transported by the developer transporting member of the developing device while a magnetic brush is formed, and
the two-component developer is used so as to satisfy a condition in which a width of a region where the magnetic brush contacts a surface of the latent image carrier is in a range of from 1.0 mm to 2.25 mm, and a condition in which a developer density of the region where the magnetic brush contacts the surface of the latent image carrier is in a range of from 0.75×10 −6 to 1.50×10 −6 g/m 3 .
2. A developing device comprising:
a circular cylindrical developer transporting member that rotates so that a direction of movement of a portion thereof that approaches a latent image carrier that rotates is in an opposite direction, the developer transporting member carrying and transporting a two-component developer while a magnetic brush is formed, the two-component developer including toner and a magnetic carrier,
wherein the developing device is used in states in which
a distance between the developer transporting member and the latent image carrier is in a range of from 125 μm to 250 μm,
a width of a region where the magnetic brush that is formed at the developer transporting member contacts a surface of the latent image carrier is in a range of from 1.0 mm to 2.25 mm, and
a developer density of the region where the magnetic brush that is formed at the developer transporting member contacts the surface of the latent image carrier is in a range of from 0.75×10 −6 to 1.50×10 −6 g/m 3 .
3. An image forming apparatus comprising:
a latent image carrier that rotates; and
a developing device that includes a circular cylindrical developer transporting member that rotates so that a direction of movement of a portion of the developer transporting member that approaches the latent image carrier is in an opposite direction, the developer transporting member carrying and transporting a two-component developer while a magnetic brush is formed, the two-component developer including toner and a magnetic carrier,
wherein a distance between the developer transporting member and the latent image carrier is in a range of from 125 μm to 250 μm,
a width of a region where the magnetic brush that is formed at the developer transporting member contacts a surface of the latent image carrier is in a range of from 1.0 mm to 2.25 mm, and
a developer density of the region where the magnetic brush that is formed at the developer transporting member contacts the surface of the latent image carrier is in a range of from 0.75×10 −6 to 1.50×10 −6 g/m 3 .