DEVICE FOR AUTOMATICALLY REGULATING THE CONCENTRATION OF DEVELOPING SOLUTION

摘要

Device for automatically regulating the concentration of developing solution in a wet type electrophotographic machine. Stirrer means is used to stir the developing solution for circulation through a developing tray and a reservoir, and a concentration detector is disposed in the stream of developing solution. The concentration detector has a source of radiation such as light and two elements sensitive to the radiation and the detection circuit including two elements. The concentration detector provided within the stream can effect the regulation of concentration with high accuracy and stability.