Patent attributes
A liquid circulating apparatus includes a liquid discharging unit for having a nozzle, a supply path, a recovery path, first and second pressure adjusting units, an opening/closing valve and a circulation controlling unit. The circulation controlling unit controls the first and second pressure adjusting units and the opening/closing valve to circulate the liquid by causing a differential pressure between the liquid at a supply side and at a recovery side with respect to the nozzle while the liquid maintains a meniscus in the nozzle. The circulation controlling unit (i) makes a differential pressure between the liquid of the supply path and the recovery path to be lower than the differential pressure in middle of the circulation while the opening/closing valve is closed when the liquid starts circulating, (ii) opens the opening/closing valve, and (iii) changes the differential pressure to the differential pressure in middle of the circulation.
