Patent ID: 11934145
Assignee: RICOH COMPANY, LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A developing apparatus, comprising:
an electrostatic latent image bearer to bear an electrostatic latent image on a surface of the electrostatic latent image bearer;
a developing sleeve to:
attract a two-component developer containing a toner and a magnetic carrier to a surface of the developing sleeve by a magnetic force to form a magnetic brush; and
rub the magnetic brush against the surface of the electrostatic latent image bearer to develop the electrostatic latent image on the surface of the electrostatic latent image bearer into a toner image;

a case that accommodates the two-component developer and the developing sleeve; and
an air filter attached to the case, the air filter having a thickness of 2 to 20 mm and having a density gradient with a pressure loss of 2 to 40 Pa at a wind speed of 10 cm/s,
the air filter to:
form an airflow sucked into the case from a gap between the developing sleeve and the case; and
form an airflow discharged from the case through the air filter,

the two-component developer accommodated in the case containing a magnetic particle a surface of which is coated with a resin layer, and
the resin layer containing at least one type of chargeable particle.