Abstract: A liquid droplet ejection device including: a liquid droplet ejection head including a nozzle, a supply channel, a discharge channel, a filter, and a communicating channel; and a liquid feeder that performs a liquid feeding operation causing the liquid in the supply channel and the discharge channel to flow in the liquid feeding direction. A mesh diameter of the filter is smaller than an aperture diameter of the nozzle, and the liquid feeder performs the liquid feeding operation in such a way that a pressure loss in the filter is smaller than a first meniscus break pressure at which a meniscus of the liquid ruptures in the filter.

Abstract: An inkjet head may include the following. A plurality of ink emitters, each including, an ink storage, a pressure changer which changes pressure in the ink stored in the ink storage, a nozzle which is connected to the ink storage and which emits ink according to a change in pressure in the ink in the ink storage, a plurality of precedent stage individual discharge flow paths which are connected to one ink storage and through which ink discharged without being supplied from the ink storage to the nozzle passes, and a subsequent stage individual discharge flow path to which, the plurality of precedent stage individual discharge flow paths join. A common discharge flow path may be connected to the plurality of subsequent stages individual discharge flow paths included in the plurality of ink emitters, and the ink which passes through the plurality of subsequent stage individual discharge flow paths flows.

Abstract: An inkjet head manufacturing method for an inkjet head that includes a head chip including: a nozzle ejecting ink; and a flow path substrate including an ink flow path which communicates with the nozzle and through which the ink flows, the method including: composite substrate manufacturing that is manufacturing a composite substrate including a plurality of regions which forms flow path substrates by being split; first protective film forming that is forming a first protective film on a surface of the composite substrate and an inner wall surface of the ink flow path; splitting that is splitting the composite substrate into the flow path substrates; and second protective film forming that is forming a second protective film on at least an exposed face in a split face of the flow path substrate generated in the splitting, the exposed face being exposed in a surface of the head chip.

Abstract: An ink-jet recording apparatus may include an ink-jet head having: individual connection flow channels through which ink can be discharged from pressure chambers; and a common flow channel at which ink from the individual connection flow channels merges, wherein when the ink is ejected, in a nozzle through which the maximum amount of ink per unit time is ejected, the relationship of (Fn/Fi)?10 is satisfied, Fn representing the amount of ink ejected per unit time from the nozzle, and Fi representing the average flow rate of ink discharged per unit time from the individual connection flow channels, and the relationship of (Rc/Rt)?10 is satisfied, Rc representing the flow channel resistance of the common flow channel, and Rt representing the synthetic resistance of the individual connection flow channels.

Abstract: Provided is an inkjet head including a plurality of ink dischargers, a first common ejection flow path, and a second common ejection flow path. Each of the ink dischargers includes an ink storage, a pressure changer, a nozzle, and a first individual ejection flow path and a second individual ejection flow path that communicate to the ink storage and through which ink is ejected from fee ink storage but not supplied to the nozzle. The first common ejection flow path communicates to a plurality of first individual ejection flow paths of the respective plurality of the ink dischargers, and the second common ejection flow path communicates to a plurality of second individual ejection flow paths of the respective plurality of fee ink dischargers.

Abstract: Provided is an inkjet head including a plurality of ink dischargers, a first common ejection flow path, and a second common ejection flow path. Each of the ink dischargers includes an ink storage, a pressure changer, a nozzle, and a first individual ejection flow path and a second individual ejection flow path that communicate to the ink storage and through which ink is ejected from fee ink storage but not supplied to the nozzle. The first common ejection flow path communicates to a plurality of first individual ejection flow paths of the respective plurality of the ink dischargers, and the second common ejection flow path communicates to a plurality of second individual ejection flow paths of the respective plurality of fee ink dischargers.

Abstract: Provided is an inkjet head including: ink discharge sections with pressure chambers, nozzles, and first individual ink ejection flow paths and second individual ink ejection flow paths; a first common ink ejection flow path which communicates to the first individual ink ejection flow paths and into which ink flows through the first individual ink ejection flow paths in a first flow-in section; and a second common ink ejection flow path which communicates to the second individual ink ejection flow paths and into which ink flows through the second individual ink ejection flow paths in a second flow-in section. As a position of the nozzles is nearer to a one end, corresponding positions at which ink ejected from the ink end respectively in the first flow-in section and the second flow-in section.

Abstract: An inkjet head may include the following. A plurality of ink emitters, each including, an ink storage, a pressure changer which changes pressure in the ink stored in the ink storage, a nozzle which is connected to the ink storage and which emits ink according to a change in pressure in the ink in the ink storage, a plurality of precedent stage individual discharge flow paths which are connected to one ink storage and through which ink discharged without being supplied from the ink storage to the nozzle passes, and a subsequent stage individual discharge flow path to which, the plurality of precedent stage individual discharge flow paths join. A common discharge flow path may be connected to the plurality of subsequent stages individual discharge flow paths included in the plurality of ink emitters, and the ink which passes through the plurality of subsequent stage individual discharge flow paths flows.

Abstract: An ink jet head with a head chip including a nozzle layer with nozzles for jetting ink and a pressure chamber layer with pressure chambers communicated respectively with the nozzles; and a manifold which stores the ink to be supplied to the pressure chambers; where the head chip has individual communication flow paths which are communicated respectively with the pressure chambers and which are capable of discharging the ink in the pressure chambers; and a common communication flow path which is disposed in a part facing the nozzle layer of the pressure chamber layer and which is connected to the individual communication flow paths to join the ink discharged from the individual communication flow paths together.

Abstract: An inkjet head manufacturing method for an inkjet head that includes a head chip including; a nozzle ejecting ink; and a flow path substrate including an ink flow path which communicates with the nozzle and through which the ink flows, the method including; composite substrate manufacturing that is manufacturing a composite substrate including a plurality of regions which forms flow path substrates by being split; first protective film forming that is forming a first protective film on a surface of the composite substrate and an inner wall surface of the ink flow path; splitting that is splitting the composite substrate into the flow path substrates; and second protective film forming that is forming a second protective film on at least an exposed face in a split face of the flow path substrate generated in the splitting, the exposed face being exposed in a surface of the head chip.

Abstract: An ink-jet recording apparatus may include an ink-jet head having: individual connection flow channels through which ink can be discharged from pressure chambers; and a common flow channel at which ink from the individual connection flow channels merges, wherein when the ink is ejected, in a nozzle through which the maximum amount of ink per unit time is ejected, the relationship of (Fn/Fi)?10 is satisfied, Fn representing the amount of ink ejected per unit time from the nozzle, and Fi representing the average flow rate of ink discharged per unit time from the individual connection flow channels, and the relationship of (Rc/Rt)?10 is satisfied, Rc representing the flow channel resistance of the common flow channel, and Rt representing the synthetic resistance of the individual connection flow channels.

Abstract: Provided is an inkjet head including: ink discharge sections with pressure chambers, nozzles, and first individual ink ejection flow paths and second individual ink ejection flow paths; a first common ink ejection flow path which communicates to the first individual ink ejection flow paths and into which ink flows through the first individual ink ejection flow paths in a first flow-in section; and a second common ink ejection flow path which communicates to the second individual ink ejection flow paths and into which ink flows through the second individual ink ejection flow paths in a second flow-in section. As a position of the nozzles is nearer to a one end, corresponding positions at which ink ejected from the ink end respectively in the first flow-in section and the second flow-in section.

Abstract: An ink-jet recording apparatus may include an ink-jet head having: individual connection flow channels through which ink can be discharged from pressure chambers; and a common flow channel at which ink from the individual connection flow channels merges, wherein when the ink is ejected, in a nozzle through which the maximum amount of ink per unit time is ejected, the relationship of (Fn/Fi)?10 is satisfied, Fn representing the amount of ink ejected per unit time from the nozzle, and Fi representing the average flow rate of ink discharged per unit time from the individual connection flow channels, and the relationship of (Rc/Rt)?10 is satisfied, Rc representing the flow channel resistance of the common flow channel, and Rt representing the synthetic resistance of the individual connection flow channels.

Abstract: An ink-jet recording apparatus may include an ink-jet head having: individual connection flow channels through which ink can be discharged from pressure chambers; and a common flow channel at which ink from the individual connection flow channels merges, wherein when the ink is ejected, in a nozzle through which the maximum amount of ink per unit time is ejected, the relationship of (Fn/Fi)?10 is satisfied, Fn representing the amount of ink ejected per unit time from the nozzle, and Fi representing the average flow rate of ink discharged per unit time from the individual connection flow channels, and the relationship of (Rc/Rt)?10 is satisfied, Rc representing the flow channel resistance of the common flow channel, and Rt representing the synthetic resistance of the individual connection flow channels.

Abstract: An ink jet head with a head chip including a nozzle layer with nozzles for jetting ink and a pressure chamber layer with pressure chambers communicated respectively with the nozzles; and a manifold which stores the ink to be supplied to the pressure chambers; where the head chip has individual communication flow paths which are communicated respectively with the pressure chambers and which are capable of discharging the ink in the pressure chambers; and a common communication flow path which is disposed in a part facing the nozzle layer of the pressure chamber layer and which is connected to the individual communication flow paths to join the ink discharged from the individual communication flow paths together.