LIQUID DEVELOPER SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a liquid developer supply device which comparatively highly accurately detects the alkali concentration and dissolved resin concentration of a liquid developer recovered from a development process on a liquid crystal substrate or a printing board, and supplies the liquid developer of comparatively correctly adjusted density to the development process. SOLUTION: The liquid developer supply device includes a supply tank (1) storing liquid developer to be supplied; a recovered liquid supply mechanism (2) which feeds used liquid developer to the supply tank (1); an original liquid supply mechanism (3) which feeds fresh original liquid developer to the supply reservoir; and a specific concentration meter (5) which detects the alkali concentration and resin concentration of the used liquid developer at constant temperature from ultrasonic wave propagation velocity and absorbance. On the basis of the concentrations detected by the concentration meter (5), the feed of the original liquid developer by the original liquid supply mechanism (3) can be controlled. COPYRIGHT: (C)2005,JPO&NCIPI