Wet type developing apparatus

A wet type developing apparatus in which a liquid developer is fed onto a developing roller from a liquid developer supply roller immersed in the developing liquid within a liquid developer tank and an electrostatic latent image formed on a photoconductor drum is developed into a toner image by said developing roller, the apparatus comprising:

• a partition plate disposed generally under the liquid developer supply roller in the liquid developer tank for partitioning the liquid developer tank into two in a rotational direction of the liquid developer supply roller, the partition plate having an upper end juxtaposed with a peripheral surface of the liquid developer supply roller over its total axial length across a gap spacing between 0.05 and 0.5 mm;
• wherein a peripheral speed of the liquid developer supply roller is adjustably varied relative to a peripheral speed of the developing roller to make adjustable a thickness of a film of the liquid developer fed onto the developing roller and to maintain the thickness of the film between 3 and 4.8 μm.