Patent ID: 8208838
Filing Date: 2012-06-26
Classification: G03G

Abstract:
1. A developing device for use with an electrophotographic image forming apparatus, said developing device comprising: a developer carrying member that develops an electrostatic latent image formed on an electrophotographic photosensitive member with developer; a developer chamber provided with said developer carrying member; a developer accommodating chamber that accommodates the developer to be supplied to said developer chamber, and comprises (a) a wall surface separating said developer accommodating chamber from said developer chamber, the wall surface being provided with an opening for permitting passing of the developer therethrough, and (b) a bottom surface; a rotation shaft rotatably supported in said developer accommodating chamber; and a light transmitting member mounted to said developer accommodating chamber at a position upstream of the opening and downstream of the bottom surface of said developer accommodating chamber with respect to a rotational direction of said rotation shaft, said light transmitting member passing a detection light through an inside of said developer accommodating chamber in order to detect the amount of the developer in said developer accommodating chamber, wherein said rotation shaft includes: wherein said receiving portion and said light transmitting member are provided on the same plane that is perpendicular to a rotational axis of rotation shaft.