Ink concentration detecting method, ink concentration detecting apparatus, and ink jet recording apparatus using the same

摘要

The ink concentration detecting method and apparatus detect ink concentration of ink containing charged colorant particles. The method and apparatus detect ejection state of ink droplets ejected by causing predetermined electrostatic force to act on the ink, and detect the ink concentration in correspondence to the detected ejection state of the ink droplets. The apparatus includes an ejection detecting device for detecting the ejection state and a concentration detecting device for detecting the ink concentration. The electrostatic ink jet recording apparatus includes an ink ejecting device for ejecting the ink droplets at predetermined frequency corresponding to the ink concentration and the ink concentration detecting apparatus.