| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform stable detection of a residual amount of developer without relying on a shape of a developer storage bag in a developer replenishment container using the developer storage bag, which is composed of a flexible bag and the shape of which is deformed.SOLUTION: An image formation device comprises: a developer storage bag that accommodates developer to be used for forming an image, is composed of a flexible material, and has an exhaust part externally exhausting the developer; a pump that controls a volume of the developer storage bag by introduction of air or inhalation thereof; state detection means that, when the volume of the developer storage bag is controlled by the pump and the developer storage bag is filled with air, detects a change in a state of the developer storage bag; and developer residual amount detection means that, when the developer storage bag is filled with the air by the pump until it is determined by the state detection means that the developer storage bag becomes in a prescribed state, detects a residual amount of the developer accommodated in the developer storage bag on the basis of drive information on the pump.</p> |
