Patent application number | Description | Published |
20100277523 | Liquid Ejection Apparatus And Head Maintenance Method - A liquid ejection apparatus includes: an inkjet head including a plurality of nozzles which eject liquid containing a water-soluble high-boiling-point organic solvent having an SP value of 30 or lower at a concentration of 10 weight percent or higher and 25 weight percent or lower, a plurality of liquid chambers connected to the plurality of nozzles respectively, and a plurality of supply flow channels to any of which each of the plurality of nozzles is connected and which supply the liquid to the plurality of nozzles via the plurality of liquid chambers; a capping device configured to simultaneously cap the nozzles connected to the same supply flow channel, from a liquid ejection surface side of the inkjet head; a pressure application device which applies pressure to the liquid inside the nozzles via the capping device; and a pressure control device which controls the pressure application device so as to repeat pressurization and depressurization with respect to the liquid inside the nozzles. | 11-04-2010 |
20110085012 | DROPLET EJECTION HEAD, DROPLET EJECTION APPARATUS, AND METHOD OF COLLECTING BUBBLES IN DROPLET EJECTION HEAD - The droplet ejection head includes: a plurality of droplet ejection units which include ejection ports through which droplets of liquid are ejected, pressure chambers which are connected to the ejection ports through connection channels, drive elements which apply pressure to the liquid in the pressure chambers, supply channels through which the liquid is supplied to the pressure chambers, and return channels through which the liquid is returned from the connection channels; a common supply channel through which the liquid is supplied to the supply channels; and a common return channel through which the liquid is returned from the return channels, the common return channel including a stagnant flow region having a bubble collection section where bubbles are collected, wherein pressure variation occurring in each pressure chamber when ejecting a droplet of the liquid propagates more readily in the common return channel than in the common supply channel. | 04-14-2011 |
20110316934 | DROPLET EJECTION HEAD - In a droplet ejection head, each of droplet ejection units includes: a nozzle which ejects droplets of liquid, a pressure chamber which is filled with the liquid and connected to the nozzle, a drive element which applies pressure to the liquid inside the pressure chamber, and an individual supply channel and an individual recovery channel which are connected to the pressure chamber. The liquid is supplied to and recovered from the pressure chamber through the individual supply channel and the individual recovery channel. In each of the droplet ejection units, a diameter Dn (μm) of the nozzle, a flow channel resistance R1 (Ns/m | 12-29-2011 |
20120218333 | DRIVE APPARATUS FOR LIQUID EJECTION HEAD, LIQUID EJECTION APPARATUS AND INKJET RECORDING APPARATUS - A drive apparatus for a liquid ejection head, includes a drive signal generating device for generating a drive signal to operate an ejection energy generating element provided so as to correspond to a nozzle of the liquid ejection head, the drive signal being supplied to the ejection energy generating element so that a liquid droplet is caused to be ejected from the nozzle, wherein: the drive signal includes a plurality of ejection pulses for performing a plurality of ejection operations during one recording period, in a remaining pulse sequence excluding a final pulse of the plurality of ejection pulses, a voltage amplitude of a subsequent pulse is smaller than a voltage amplitude of a preceding pulse, and the final pulse has a largest voltage amplitude, of the plurality of ejection pulses. | 08-30-2012 |
20130083107 | INKJET RECORDING APPARATUS AND METHOD, AND ABNORMAL NOZZLE DETERMINATION METHOD - According to the present invention, the occurrence of an ejection abnormality can be determined at an early stage by using a waveform for abnormal nozzle determination, before an image defect producing a visible density non-uniformity (stripe non-uniformity) occurs due to an ejection defect in an output image recorded by a drive signal having a recording waveform. Consequently, recording stability and throughput can both be achieved. | 04-04-2013 |