Patent ID: 7380927

Claim:
A liquid jet recording apparatus comprising: a liquid jet head including: discharge ports configured to discharge liquid; a plurality of element substrates each of which is provided with a plurality of energy generating elements configured to apply kinetic energy to the liquid; a base substrate configured to support the plurality of element substrates; a plurality of common liquid chambers provided in the base substrate and corresponding with the plurality of element substrates; and a head liquid chamber provided opposite to the plurality of element substrates across the base substrate and configured to supply the liquid to be discharged to the plurality of common liquid chambers, wherein the base substrate includes an in-substrate liquid path that is not communicated with the plurality of common liquid chambers and that has a liquid indraft orifice and a liquid outflow orifice, and wherein the head liquid chamber has at least a liquid indraft orifice and a liquid outflow orifice for the liquid to be discharged; and a liquid reserve tank and a sub-tank configured to reserve the liquid to be supplied to the liquid jet head; a first liquid supply path that leads from the liquid reserve tank to the liquid indraft orifice provided on the base substrate via a pump; a second liquid supply path that leads from the liquid outflow orifice provided on the base substrate to the sub-tank; a third liquid supply path that leads from the sub-tank to the liquid indraft orifice provided on the head liquid chamber of the liquid jet head; a fourth liquid supply path that leads from the liquid outflow orifice provided on the head liquid chamber of the liquid jet head to one of the liquid reserve tank and the sub-tank; and a fifth liquid supply path that leads from the sub-tank to the liquid reserve tank and that is configured to return the liquid from the sub-tank to the liquid reserve tank when a predetermined amount or more of the liquid is supplied from the liquid reserve tank to the sub-tank via the pump.