摘要:
An ink jet printer head of hot-melt type for heating and melting solid ink and then discharging the melted ink onto a recording medium is provided with: a cavity plate prescribing (i) an ink flow path through which the melted ink is supplied, (ii) a plurality of ink storing chambers, each of which is connected to the ink flow path in which the supplied ink is temporarily stored, and (iii) a plurality of ink discharge holes which are connected to respective one of the ink storing chambers though which the temporarily stored ink is discharged; a piezoelectric element member, which is opposed to the cavity plate and has a plurality of piezoelectric elements for selectively changing capacities of the ink storing chambers; and a base member for supporting the piezoelectric element member. The piezoelectric element member is interposed and fixed between the cavity plate and the base member. The cavity plate, the piezoelectric element member and the base member have thermal expansion coefficients equal or approximate to each other.
摘要:
A testing method includes sorting inkjet heads into a plurality of groups on the basis of known information about ink flow, preparing basic driving waveform data corresponding to each of the groups and modification data that partially modifies the basic driving waveform data to individually store them in advance in a storing section, creating individual waveform information that instructs combinations of the basic driving waveform data with the modification data with respect to an inkjet head to be tested to apply a modified driving waveform, and repeating the modification of the individual waveform information until a recording state becomes good.
摘要:
In an ink-jet recording apparatus, an active portion for jetting a pigment ink has an area greater than an area of an active portion for jetting a dye ink. Accordingly, the active portion for jetting the pigment ink is capable of generating energy greater than that generated by the active portion for jetting the dye ink. In addition, since a diameter of nozzles which jet the pigment ink is greater than that of nozzles which jet the dye ink, it is possible to jet, at a substantially same speed, the pigment ink and the dye ink to which the different energies are imparted. Further, when performing the recording with the pigment ink, a liquid-droplet having a large volume can be obtained, and when performing the recording with the dye ink, a liquid-droplet having a small volume can be obtained.
摘要:
A liquid-droplet jetting apparatus includes a first common liquid chamber which supplies a liquid to first pressure chambers communicating with first nozzles and extending in a predetermined direction; and a second common liquid chamber which supplies a liquid to second pressure chambers communicating with second nozzles and extending in the predetermined direction. The first and second common liquid chambers are overlapped in a plan view, and each having a substantial width. A damper for attenuating pressure wave which propagates to the first and second common liquid chambers is formed at a portion in which the first and second common liquid chambers are overlapped. Each of the first common liquid chamber, the second common liquid chamber and the damper is formed to have a width overlapping with one of the first and second pressure chambers, thereby making it possible to attenuate the pressure wave efficiently.
摘要:
An ink-jet head includes pressure chambers arranged in a row in a row-direction, and a manifold flow passage communicated with the pressure chambers and extending in the row-direction. An ink inflow port is formed at one end of the manifold flow passage. The manifold flow passage has a main portion, a connecting portion, and an extended portion which are arranged in this order from a side close to the ink inflow port. The manifold flow passage is communicated with the pressure chambers at the main portion. The main portion has a constant cross-sectional area greater than that of the connecting portion. A cross-sectional area of the extended portion is greater than that of the connecting portion. The pressure wave, generated in the pressure chamber and propagated to the manifold flow passage, can be efficiently attenuated by the manifold flow passage constructed as described above.
摘要:
An ink ejecting device in accordance with the invention regulates the ink ejecting velocity for each nozzle. A piezoelectric element thereof is made of piezoelectric materials, internal discrete electrodes and a common electrode. When a cut in the common electrode is formed above an ink chamber, the cut creates an area where an electric field is not generated. The extent of deformation of the piezoelectric element is reduced in that area, whereby the ink ejecting velocity from the ink chamber decreases. In this way, it is possible to regulate the ink ejecting velocity for each nozzle by providing the cut and adjusting the extent of deformation. Further, the size of the cut is in proportion to the deceleration of ink ejecting velocity. This cut in the common electrode is created exactly above the center of the ink chamber so that the deforming portion and non-deforming portion of the piezoelectric element are well balanced.
摘要:
A piezoelectric actuator includes first active portion which correspond to a central portion of each of pressure chambers and a second active portion which correspond to a portion, of each of the pressure chambers, located on outer circumferential sides with respect to the central portion of the pressure chamber. The first active portion and the second active portion are deformed by applying the voltage to each of the first and second active portions. The first active portion is polarized in a direction parallel to the electric field generated in the first active portion, and the second active portion is polarized in a direction opposite to the electric field generated in the second active portion, thereby making it possible to suppress the crosstalk even when a high density arrangement of the pressure chambers is realized.
摘要:
An ink-jet recording apparatus detects a temperature of an ink-jet head, and reads, from a table of set drive voltages, a drive voltage corresponding to that head temperature. The read drive voltage is determined to be a drive voltage V1 to be used in a recording for this time. Further, when the scanning number “n” of the ink-jet head has reached a value “m”, a drive voltage V2 to be used for next time is temporarily determined, based on the head temperature. When |V1−V2| is greater than a value ΔV, a voltage obtained by making a correcting, by an amount of ΔV, to the drive voltage V1 is determined to be the drive voltage V2 to be used next time. Therefore, even when the ink temperature is changed during the recording, it is possible to improve the recording quality.
摘要:
In a liquid droplet jetting mode of jetting liquid droplets, a controller controls a piezoelectric actuator to perform a liquid droplet jetting operation in which volume of a pressure chamber is decreased to a decreased volume smaller than a predetermined volume, and then the volume of the pressure chamber is increased to an increased volume greater than the predetermined volume, and the volume of the pressure chamber is again decreased to the decreased volume. On the other hand, in a warm-up mode of heating the liquid in the pressure chamber, the controller controls the piezoelectric actuator to perform at least one of a first warm-up operation in which the volume of the pressure chamber is changed repeatedly between the predetermined volume and the increased volume, and a second warm-up operation in which the volume of the pressure chamber is changed repeatedly between the predetermined volume and the decreased volume.
摘要:
A piezoelectric actuator includes first active portion which correspond to a central portion of each of pressure chambers and a second active portion which correspond to a portion, of each of the pressure chambers, located on outer circumferential sides with respect to the central portion of the pressure chamber. The first active portion and the second active portion are deformed by applying the voltage to each of the first and second active portions. The first active portion is polarized in a direction parallel to the electric field generated in the first active portion, and the second active portion is polarized in a direction opposite to the electric field generated in the second active portion, thereby making it possible to suppress the crosstalk even when a high density arrangement of the pressure chambers is realized.