Patent ID: 9665038
Date: 2017-05-30
CPC Classifications: G03G

Claim:
1. A developing device comprising: a developing container for accommodating a developer containing non-magnetic toner particles and magnetic carrier particles; a developer carrying member, provided opposite to an image bearing member for bearing an electrostatic latent image, for carrying and feeding the developer; and a collecting device for collecting a part of the developer carried on said developer carrying member, wherein said collecting device is provided upstream of a developing portion where said developer carrying member opposes the image bearing member with respect to a developer feeding direction of said developer carrying member, and said collecting device is disposed opposite to said developer carrying member, wherein a coverage which is a percentage of coating of surfaces of the carrier particles with the toner particles is 100% or more and 200% or less, wherein said developer carrying member has a plurality of recessed portions formed on a surface thereof so that at least the toner particles having an average particle size are contactable with inner surfaces of the recessed portions and the carrier particles having an average particle size are not contactable with the inner surfaces of the recessed portions, and wherein, a depth of each recessed portion is smaller than half a size of the toner particles having the average particle size.