JPS5912859A - Ink jet recording head - Google Patents

Abstract

PURPOSE:To relieve interference between pressures in ink-jetting units and enhance recording quality and its speed, by providing pressure dampers at parts of an ink-supplying passage at which a plurality of ink-jetting units are connected to each other. CONSTITUTION:The dampers 6 are provided at respective parts of the ink- supplying passage 5 at which nozzles 1 or ink passages 2 (which are component elements of the ink-jetting units) are connected to each other. As a result, when an ink in a pressure chamber is pressurized, the effect of the pressure energy on the other ink-jetting units can be relieved. Accordingly, recording quality and its speed can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The technical field of the invention relates to an inkjet recording head used in an on-demand multi-nozzle inkshed printer. - tB) Technical background Inkjet single-jet printers have very few mechanical parts, and therefore operate extremely quietly and with high reliability.In particular, on-demand multi-nozzle type inkjet single-jet printers can provide a wide variety of recording formats. Suitable for high-speed recording,
Research has been conducted to further improve recording speed, recording quality, and reliability. A conventional example of an inkjet recording head is shown,
(+1) is the front view 1b) is the fllyrtJ view (c is (b) +7) A-A arrow iIl! ! With IC, 1, 2, 3 and 4 constitute an ink ejection unit, 1 is a nozzle, 2
3 is an inlet guide path provided at 110 between the nozzle 1 and the rear pressure car for guiding ink; 3 is a pressure chamber that pressurizes the ink inside by being deformed under the action of the piezoelectric element described later; 4 is a piezoelectric element provided on the side wall of the pressure chamber 3; 5 is an ink auxiliary unit that connects the ink conduction passages 2 of each of the 1M units in parallel to provide an ink jetting unit for replenishing the inkjet unit; The path C must have the above-described structure, run opposite the opening of the nozzle U) and the recording medium, and apply a plurality of pressures according to the recording pattern. The element 4 is selectively driven to apply pressure to the ink inside the compression chamber 3 corresponding to this, and ink particles are ejected from the corresponding nozzle l to perform recording. However, when the piezoelectric element 4 is driven to pressurize the ink inside the corresponding nozzle 4, the pressure energy is used to eject ink particles into the corresponding nozzle. Sa21. Not only that, but also the piezoelectric elements of zero to a number are transmitted to other ink ejecting units through the ink supply path 5 and cause vibrations to the meniscus of other nozzles l, making the operation of the ink ejecting units unstable. When 4 and 6c are driven at the same time, they cause complicated interference with each other, which changes the ejection speed or particles of ink particles, resulting in poor print quality and the inability to increase the recording speed. ing.

FIG. 2 shows another conventional example of an on-demand multi-nozzle inkjet recording head designed to improve the recording speed, and the difference from the first conventional example is the ink 4J! Noodles Il
! An ink replenishment path 5 is provided by connecting in series the nozzles l of the ink ejecting units with the nozzles l of the ink ejecting units.

The same problems as in the conventional example shown in FIG. 1 occur in this type of inkjet self-recording head.

OBJECTS OF THE INVENTION An object of the present invention is to provide an inkjet self-recording head 2f that can solve the above-described problems and further improve the recording quality and recording degree.

■ Structure of the Invention The present invention (this inkjet diary head includes a plurality of ink ejection units arranged in parallel and each having a nozzle and a pressure chamber as main constituents of 4M elements, and a plurality of ink ejection units for each of the plurality of ink ejection units). each ink conduction path provided between the nozzle and the pressure chamber or an ink replenisher that connects each nozzle in series or parallel to replenish ink,
An ink genie that performs recording by scanning a recording medium and selectively pressurizing the pressure chambers of multiple sets of ink jet units and jetting ink particles from corresponding nozzles.) In the print head, the 41-port set of the ink supply path An embodiment of the invention in which a pressure hole is provided at the part where the ink jetting units of the ink jetting unit are connected to each other to reduce mutual interference between the ink jetting units and improve ink replenishment ability. The gist of the present invention will be explained below in detail using 11 Examples.

Figures 3, 4, 5 p and 6 show the first embodiment, second embodiment, and third embodiment 2 and 4 of the present invention, respectively.
In these figures, the same reference numerals as in the conventional example in FIG. 41 do not indicate the same objects, and 6 and 7 indicate pressure dampers.

In addition, Fig. 3-8g4 and Fig. 5 show the case where the present invention is applied to the conventional example shown in Fig. 1, and Fig. 6 shows the case where the present invention is applied to the conventional example shown in Fig. 2.
ζ A case where the present invention is applied is shown.

In any of the above embodiments, a damper 6 or 7 is provided at each part of the ink supply path 5 that interconnects the nozzles 1 or the ink conduction paths 2, which are components of the ink jetting unit. For this reason, C in the pressure chamber 3
When the internal ink is pressurized, the influence of the pressure energy on other ink ejection units can be reduced.0 Figure 7 shows an example of the pressure damper 6 in cross-sectional view. The structure can be easily constructed by blocking the hole 61 formed from the outside of the ink replenishment path 5 with a thin film suitable for vibration damping, such as a film made of a material.

l) Detailed description of the invention: 1) This method reduces the influence of pressure between the injection unit and the injection unit, thereby improving the recording quality and recording speed. You can get the next inkjet valve/rad 0

[Brief explanation of drawings]

Figures 1' and 2 are conventional examples of on-demand multi-nozzle inkjet recording heads, and Figures :), 4, 5, and 6 are examples of the first embodiment of the present invention, A2, respectively. Embodiment, third embodiment, and fourth embodiment are shown, in which l is a nozzle, 2 is an ink conduction path, 3 is a pressure chamber, 5 is an ink supply path, and 6 and 7 are pressure No damper shown. Further, FIG. 7 shows a configuration example C of the pressure damper 6.

Claims (2)

[Claims] (1) A plurality of sets of ink jetting units provided in parallel and having a nozzle and a pressure chamber as main components, and each set of ink jetting units provided between the nozzle and the pressure chamber for each of the plurality of sets of ink jetting units. Is the conduction path or each nozzle r in series 4L< an ink supply path that connects in parallel to supply ink? In an inkjet-C recording head that performs recording by scanning a recording medium, selectively pressurizing the pressure chambers of a plurality of ink jetting units, and jetting ink particles from corresponding nozzles, the plurality of ink supply paths 1. An inkjet tsuba-kiroku head characterized in that a pressure damper is provided in the mutually connected parts. (2) The inkjet recording head according to claim 1, further comprising a pressure damper having a thin film as a component.