Abstract: The present invention suppresses the spread of a mist of a liquid ejected from a liquid ejection head. Air is blown out toward a printing medium from a blowing-out opening relatively moving together with a print head, as the liquid ejection head, with respect to the printing medium. Air on the printing medium is sucked into a suction opening relatively moving together with the print head with respect to the printing medium. An ink ejection opening of the print head, the blowing-out opening, and the suction opening are arranged in the order from an upstream side to a downstream side in a moving direction of the printing medium with respect to the print head.

Abstract: An ink mist collection apparatus capable of suppressing adhesion of ink mist to an inner surface of a suction path, an ink jet printing apparatus, and an ink mist collection method are provided. Air above a print medium is sucked with the ink mist from a suction port through a suction path, the suction port being located downstream with respect to a print head in a conveying direction of the print medium and being opposite to the print medium. Gas is discharged from a discharge port into the inside of the suction path.

Abstract: There are provided a mist collecting mechanism capable of efficiently sucking and collecting an air blown out from a blow-out unit and a liquid ejection apparatus including the mist collecting mechanism. The mist collecting mechanism includes a suction port configured to suck an air containing mists. Moreover, the mist collecting mechanism includes a first blow-out port that blows out an air in order to guide the air containing mists to the suction port. Moreover, the mist collecting mechanism includes a second blow-out port that blows out an air in order to adjust a position, toward which the air blown out from the first blow-out port flows, so that the air blown out from the first blow-out port is appropriately sucked by the suction port.

Abstract: Air blown out from one blowing-out opening of a pinch roller which is within a predetermined angle range forms an air flow of a flow rate Fc which heads for a region between a suction mechanism and a print medium. This makes it possible to efficiently guide the air blown out from the blowing-out opening into the region, and as a result, ink mist can be collected satisfactorily even in a case where the amount of air blown from the pinch roller is relatively small. Further, in this case, the flow rate Fe of a flow blown from the pinch roller is appropriately determined, whereby the suction mechanism can collect substantially 100% of air and ink mist flowing into the region.

Abstract: The present invention provides a liquid ejecting head provided with a suction port capable of avoiding the return of mists, which have once sucked through a suction port, to the suction port. In view of this, the inner diameter L of a suction tube for allowing liquid mists taken in through the suction port to pass is designed such that a meniscus is formed before a liquid droplet adhering to the inside of the suction tube grows enough to move toward the suction port.

Abstract: A print head is provided by which a temperature change depending on each region in the substrate can be suppressed. The print head has an ink chamber communicating with an ink supply port. Furthermore, the print head has: a plurality of nozzle groups each of which is formed as one unit by combining a plurality of: communication ports that are provided in the ink chamber and that communicate with the ink supply port; pressure chambers including heat generating elements, ink supply ports, and ejection ports. A plurality of nozzle groups are formed in the same substrate and form a plurality of nozzle group arrays that are formed by the nozzle groups and that extend in the same direction. The plurality of nozzle group arrays are formed to be offset from one another in the direction along which the nozzle group array extend.

Abstract: A print head is provided in which influence on ink to be ejected from an ejection port by an air flow generated by ink previously ejected from the ejection port is suppressed evenly for respective ejection ports in the print head. A print head has an ejection port for ejecting ink. On an ejection port forming face formed with the ejection port, a projection projecting from the ejection port forming face is formed. The projection is arranged at a position where the distance from a center of the ejection port is within the maximum of a diameter of a vortex core of a vortex that is formed when liquid droplets are ejected in the case without a projection.

Abstract: An ink jet print head is capable of creating a state where the direction of ink-drop ejection is not likely to be influenced by air currents generated by the ink ejection, and is capable of printing an image without causing the shifting of dots. To this end, air currents generated by the ejection of ink and the interference among the air currents are reduced by blowing out gas in a direction parallel with the direction of the ink ejection. Accordingly, even with a print head that ejects, at high ejection frequency, ink from multiple ejecting openings formed densely, the advancing direction of the ink drops is unlikely to be deflected. As a consequence, a high-quality, uniform image can be outputted.

Abstract: A print head is provided by which a temperature change depending on each region in the substrate can be suppressed. The print head has an ink chamber communicating with an ink supply port. Furthermore, the print head has: a plurality of nozzle groups each of which is formed as one unit by combining a plurality of: communication ports that are provided in the ink chamber and that communicate with the ink supply port; pressure chambers including heat generating elements, ink supply ports, and ejection ports. A plurality of nozzle groups are formed in the same substrate and form a plurality of nozzle group arrays that are formed by the nozzle groups and that extend in the same direction. The plurality of nozzle group arrays are formed to be offset from one another in the direction along which the nozzle group array extend.

Abstract: A print head of which influence on an ink to be ejected from an ejection port subsequently by an air flow generated by an ink to be ejected from the ejection port is suppressed evenly for respective ejection ports in the print head is provided. A print head has an ejection port for ejecting ink. On an ejection port forming face formed with the ejection port, a projection projecting from the ejection port forming face is formed. The projection is arranged at a position where the distance from a center of the ejection port is within the maximum of a diameter of a vortex core of a vortex that is formed when liquid droplets are ejected in the case without a projection.

Abstract: The invention provides an ink jet print head capable of creating a state where the direction of ink-drop ejection is not likely to be influenced by air currents generated by the ink ejection, and capable of printing an image without causing the shifting of dots. To this end, air currents 11 generated by the ejection of ink and the interference among the air currents 11 are reduced by blowing out gas in a direction parallel with the direction of the ink ejection. Accordingly, even with a print head 1708 that ejects, at high ejection frequency, ink from multiple ejecting openings 4 formed densely, the advancing direction of the ink drops is unlikely to be deflected. As a consequence, a high-quality image of uniform can be outputted.