Patent ID: 10520884

Abstract:
A cartridge includes a cleaning member configured to retain specific particles having a smaller equivalent sphere diameter than toner particles at a contact region. The specific particles contain an organosilicon polymer having a partial structure represented by R—SiO3/2, wherein R represents an alkyl group having 1 to 6 carbon atoms. The atomic concentration dSi of silicon in the specific particles satisfies 1.0 atomic %≤dSi≤29.0 atomic % when the total atomic concentration of silicon, oxygen, and carbon in the specific particles is measured to be 100.0 atomic % by electron spectroscopy for chemical analysis (ESCA). Also, the specific particles satisfy L2/L3≤3/4 or L2/L3≥4/3 when assuming that the specific particles have three lengths L1, L2, and L3 in three axis directions in a three-dimensional coordinate system, wherein L1 is the longest one of the three lengths, in an average value of a unit volume.