Inkjet recording head cartridge and inkjet recording apparatus

An inkjet recording head cartridge comprising:

• an ink emission face on which ink emission orifices are formed;
• an ink supplier provided with an ink supplying chamber inside thereof;
• and
• a heater face orthogonal to the ink emission face, the heater face being part of a side surface of the ink supply chamber,
• wherein the ink supply chamber is formed so as to have a cross-sectional area allocated in an ink flow direction so that pressure fluctuation within the ink supply chamber at the time of ink emission becomes overattenuated or critically attenuated.

An inkjet recording head cartridge comprising:

• an ink emission face on which ink emission orifices are formed;
• an ink supplier provided with an ink supplying chamber inside thereof;
• and
• a heater face orthogonal to the ink emission face, the heater face being part of a side surface of the ink supply chamber,
• wherein a relation of (R1+R2)2×(C1+C2)≧4×(L1+L2) is satisfied, where L1 is an inertance of an individual flow passages, L2 is an inertance of the ink supply chamber, R1 is a resistance value of the individual flow passages, R2 is a resistance value of the ink supply chamber, C1 is a meniscus capacitance of the ink emission orifices, and C2 is an ink supply chamber capacitance.

An inkjet recording apparatus, comprising:

• individual flow passages each having an ink emission orifice at one end thereof and an ink inflow orifice at another end;
• an ink supply chamber having open ink inflow orifices;
• an ink tank chamber that supplies ink to the ink supply chamber through a filter member placed upward in a gravity direction of the ink supply chamber;
• a determination unit that determines whether in one print job, defined as a temperature rise and cooling cycle of ink in the recording head cartridge, the total volume of ink emitted from the ink emission orifices exceeds the sum of the capacity of the ink supply chamber and the initial capacity of ink held in the ink tank chamber;
• and
• a printing control unit that, if the total volume of the ink emitted exceeds the sum of the capacity, halts printing during the print job and resumes printing after the ink within the ink supply chamber is cooled to a predetermined temperature.