Liquid developing device, method of it's maintenance and the method of recovery of supplemental fluid from the liquid developing device

摘要

A liquid type development device for developing an electrostatic latent image formed on image-holding equipment by using liquid developer made of a highly insulating solvent and toner particles dispersed in the solvent has a liquid developer tank detachably situated in a cartridge; and at least one supplementary liquid tank containing supplementary liquid to be added to liquid developer contained in the liquid developer tank so as to keep the concentration of nonvolatile components in the liquid developer constant. Further, when the used development cartridge is recovered, and another new development cartridge is bought, a discount price privilege for the newly bought development cartridge is given to a user who has turned in the used cartridge.