Patent ID: 9104142
Filing Date: 2015-08-11
Classification: G03G

Abstract:
1. A developing device comprising: a developing container which stores a developer including a non-magnetic toner and a magnetic carrier; a toner bearing member which bears the toner and conveys the toner to a developing portion formed between the toner bearing member and an image bearing member on which an electrostatic latent image is formed; and a separating portion which is disposed on an upstream side of the developing portion in a developer conveying direction so as to separate the toner from the developer so that the toner is supplied to the toner bearing member, wherein a surface of the toner bearing member includes a plurality of recess structures in which a smallest opening width R is equal to or larger than r each percentage of the recess structures per unit area in any area of a toner bearing region of the toner bearing member is equal to or larger than 55%.