Patent ID: 8449087

Claim:
A liquid circulating apparatus comprising: a liquid discharging unit that has a nozzle which discharges a liquid; a supply path that supplies the liquid to the liquid discharging unit; a recovery path that recovers the liquid from the liquid discharging unit; a first pressure adjusting unit that adjusts a pressure of the liquid in the supply path; a second pressure adjusting unit that adjusts a pressure of the liquid in the recovery path; an opening/closing valve that is provided at least one of the supply path and the recovery path to open/close the path; and a circulation controlling unit that controls the first pressure adjusting unit, the second pressure adjusting unit and the opening/closing valve to circulate the liquid by causing a differential pressure between the liquid at a supply side and the liquid at a recovery side with respect to the nozzle while the liquid maintains a meniscus in the nozzle, wherein, the circulation controlling unit (i) makes a differential pressure between the liquid of the supply path and the liquid of 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 with respect to the nozzle, (ii) opens the opening/closing valve, and (iii) changes the differential pressure to the differential pressure in middle of the circulation.