Patent ID: 9547256
Date: 2017-01-17
CPC Classifications: G03G

Claim:
1. A developing device comprising: a storing unit that stores an electrostatic charge image developing toner; and a developer holding member that is provided so as to have a gap with an image holding member and holds the electrostatic charge image developing toner on a surface, wherein the developing device develops an electrostatic charge image formed on a surface of the image holding member by using the electrostatic charge image developing toner on the developer holding member through a non-contact development, so as to form a toner image, and wherein the toner contains a binder resin, a colorant, and a release agent and has a sea and island structure of a sea portion containing the binder resin and an island portion containing the release agent, a maximum frequent value in distribution of the following eccentricity B of the island portion containing the release agent is in a range of from 0.75 to 0.95, and a skewness in the distribution of the following eccentricity B is in a range of from −1.10 to −0.50, the eccentricity B being represented by the following expression (1): wherein D indicates an equivalent circle diameter (μm) of the toner in an observation of a cross-section of the toner, and d indicates a distance (μm) from the centroid of the toner to the centroid of the island portion containing the release agent in the observation of a cross-section of the toner.