Patent ID: 9152079
Filing Date: 2015-10-06
Classification: G03G

Abstract:
1. An image forming apparatus for forming an image with a developer, comprising: a developing unit configured to be detachable from and attachable to an image forming apparatus to contain a developer; a first rotary member and a second rotary member configured to rotate in the developing unit; a detecting unit installed on an internal surface of the developing unit and configured to detect a signal corresponding to variation of pressure caused by rotation of the first rotary member or the second rotary member in said developing unit; and a switching unit configured to switch between a first determination mode and a second determination mode, wherein the first determination mode is used to determine an amount of the developer in the developing unit based on a signal corresponding to variation of pressure caused by rotation of the first rotary member, and the second determination mode is used to determine the amount of the developer in the developing unit based on a signal corresponding to variation of pressure caused by rotation of the second rotary member.