LIQUID SUPPLY UNIT, INK SUPPLY UNIT, LIQUID EJECTION HEAD, PRINTER HEAD, METHOD FOR DESIGNING LIQUID SUPPLY UNIT, METHOD FOR DESIGNING INK SUPPLY UNIT, METHOD FOR DESIGNING LIQUID EJECTION HEAD, AND METHOD FOR DESIGNING PRINTER HEAD

摘要

PROBLEM TO BE SOLVED: To prevent leakage of ink surely even when the atmospheric pressure is reduced while ensuring a sufficient ink containing quantity. SOLUTION: The ink supply unit comprises an ink containing section 30, an ink chamber 40 coupled with the ink containing section 30, and a valve 50 arranged to move such that an opening/closing member 52 opens an opening area 51 as the pressure in the ink chamber 40 lowers due to decrease in the quantity of ink in the ink chamber 40. The ink containing section 30 comprises an outer air communication hole 32a, and an air introduction pipe 32 extending from the outer air communication hole 32a into the ink containing section 30 and taking air corresponding, in volume, to the quantity of ink decreased in the ink containing section 30 from the hole 32a into the ink containing section 30 when the quantity of ink in the ink containing section 30 decreased and capable of storing ink internally. Assuming the inner volume of the ink containing section 30 is V0and the inner volume of the air introduction pipe 32 is V1, following relation is satisfied; 01/V0≤0.5. COPYRIGHT: (C)2003,JPO