Patent ID: 8277030

Claim:
A liquid ejecting head unit comprising: a plurality of pressure generating chambers; a piezoelectric device located above the plurality of pressure generating chambers so as to be configured to apply pressure to liquid in at least one of the pressure generating chambers to cause the liquid to flow; a plurality of reservoirs which are configured to communicate with the plurality of pressure generating chambers; a plurality of spaces which face the plurality of reservoirs and are separated from the plurality of reservoirs by one or more layers, the one or more layers defining and enclosing the plurality of spaces; a heating member provided entirely within each of the plurality of spaces an insulation layer formed between the one or more layers defining and enclosing the plurality of spaces and a nozzle plate comprising a plurality of nozzles, the insulation layer configured to prevent the heating members from heating the nozzle plate, a plurality of liquid flow paths connecting the plurality of nozzles with a liquid supply, the plurality of liquid flow paths including the plurality of pressure generating chambers and the plurality of reservoirs; a control unit that controls each heating member; and temperature detecting units that detect temperatures of the liquid flowing through the liquid flow paths, wherein the control unit controls the plurality of heating members based on the temperatures of the liquid which are detected by the temperature detecting units and lengths of the liquid flow paths extending from the storage members to the head main bodies.