Patent ID: 7729626

Claim:
A liquid developer concentration adjusting apparatus, comprising: a concentration adjusting container; a developer supplying mechanism which is connected to the concentration adjusting container and is adapted to supply the concentration adjusting container with a liquid developer whose concentration is to be adjusted; a viscosity detector for detecting a viscosity property value which depends on concentration of a liquid developer in the concentration adjusting container; a temperature detector for detecting a temperature of a liquid developer in the concentration adjusting container; a memory which is adapted to store a standard correction table indicating a relationship between a viscosity property value of a predetermined standard liquid developer and temperature thereof; a calibration portion which is adapted to correct the standard correction table to make a specific correction table based on outputs of the viscosity detector and the temperature detector while the concentration adjusting container is filled with a standard liquid developer for calibration; a concentration adjusting mechanism which is adapted to adjust concentration of a liquid developer in the concentration adjusting container based on the temperature of the liquid developer in the concentration adjusting container and the specific correction table such that a viscosity property value of the liquid developer is a desired value.