JPS60228161A - Ink jet head - Google Patents

Abstract

PURPOSE:To detect the position of a nozzle head easily by providing a mark corresponding to a position set aside for a nozzle head to an ink channel board and making on a substrate a through hole through while a mark can be detected on a substrate side. CONSTITUTION:Markers 29, 30 are formed on an ink channel board 28 by etching and through holes 33, 34 are provided on a vibrating plate 32. A bottom plate 24, an ink channel board 28 and a vibration board 32 are laminated and the markers 29, 30 are detected from the vibration board 32 through the through holes 33, 34. Thus each plate is polished until the head of a nozzle 27 to be formed on a straight line 31 is reached without measuring frequency the longitudinal dimension of the nozzle to be formed through polishing.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an inkjet head, and in particular, it is possible to accurately process the nozzle length, which is one of the factors determining the particle formation characteristics.
The present invention also relates to an inkjet head structure that can be carried out efficiently.

(b) Background of the technology A voltage is applied to a piezoelectric element installed above a pressure chamber containing print recording ink, and the piezoelectric element is distorted based on print information, and the stress caused by this distortion is transmitted to the pressure chamber. 2. Description of the Related Art An inkjet recording method is well known in which printing ink is ejected onto recording paper from a nozzle communicating with a pressure chamber. This inkjet recording method is a non-impact recording method that generates little noise during printing and has good print quality, so it has recently become widely used for recording information output from electronic computers. .

(C) Prior art and problems Figure 1 is a plan view of such an inkjet head.
FIG. 2 is a cross-sectional view of FIG. 1 taken along line A-A'. As shown in FIGS. 1 and 2, the bottom plate 3 is made of a thin plate made of stainless steel and has an ink supply pipe 2 that supplies ink to the ink chamber l.
a pressure chamber 5 that transmits the pressure generated by the piezoelectric element 4;
An ink channel plate 7 is laminated in which an ink channel formed by etching or the like is formed by nozzles 6 communicating with the pressure chamber 5 and ejecting ink onto the recording paper.

Furthermore, a diaphragm 8 having a piezoelectric element 4 is laminated on this ink channel plate 7, and the bottom plate 3, ink channel plate 7, and diaphragm 8 are joined by brazing or the like. Furthermore, the nozzle surfaces B of the bottom plate 3, ink flow path plate 7, and diaphragm 8 described above are polished so that the longitudinal dimension β of the nozzle 6 has a predetermined value.

To explain this in more detail, as shown in Figure 3, the pin (
11A of through-holes into which a (not shown) is inserted.

11B on the bottom plate 3 provided with the ink supply pipe 2.
As shown in the figure, an ink channel plate 7 in which the nozzle 6, pressure chamber 5, ink chamber 1, through holes 11A, and IIB are formed by etching or the like is laminated, and a fifth
Vibration plates 8 in which through holes 11A and 11B are formed as shown in the figure are stacked. Next, the through holes 11A and IIB of the bottom plate 3, ink channel plate 6, and diaphragm 8, respectively.
The nozzle surface B side of the three joined plates is cut and wrapped to form the nozzle 6 with a predetermined longitudinal dimension. ing.

By the way, conventionally, in order to process the longitudinal dimension i of this nozzle 6, as shown in FIG. Dimensions to polished surface C! By measuring 1, it was detected whether the longitudinal dimension of the nozzle 6 matched the design value or not.

However, in such a conventional inkjet head, the value of the above-mentioned dimension 11 must be frequently measured during the polishing process, and the positional deviation of each plate that occurs when stacking the plates, the bottom plate 3, When the ink flow path plate 7 and the diaphragm plate 8 are joined by soldering, the nozzle dimensions do not satisfy the design value due to shrinkage due to heating and cooling of these plates. There was a drawback that an inkjet head having ink particle formation characteristics could not be obtained.

+dl Object of the Invention The present invention eliminates the above-mentioned drawbacks, and after bonding an ink flow path plate that forms an ink flow path such as a pressure chamber to at least one other substrate such as a bottom plate, the substrate and the ink flow The object of the present invention is to provide a novel ink shared head in which the position of the tip of the formed nozzle can be easily detected when the nozzle length is processed to a predetermined value by polishing the road plate.

+8) Structure of the Invention The above object is to provide an inkjet head formed by bonding an ink flow path plate having nozzles for ejecting ink and at least one other substrate. A mark is given corresponding to the fixed position of the tip of the
This is achieved by the inkjet head of the present invention, in which the substrate is provided with a through hole through which the mark can be detected from the substrate side.

That is, in the inkjet head of the present invention, a marker indicating the position where the tip of the nozzle is formed is attached in advance to the ink flow path plate forming the nozzle holes, etc., and a through hole that can be detected by the marker is formed in the ink flow path. It is installed on a substrate other than a plate, and when forming an inkjet head, the inkjet head forming substrate can be polished while detecting the position of this marker, so that the nozzle length of the hood can be accurately formed on the inkjet. be.

(f) Embodiment of the Invention An embodiment of the invention will be described in detail below with reference to the drawings.

FIG. 6 is a plan view showing an embodiment of the bottom plate constituting the inkjet head of the present invention, FIG. 7 is a plan view showing an embodiment of the ink channel plate constituting the inkjet head of the present invention, and FIG. 9 is a plan view showing one embodiment of the diaphragm constituting the inkjet head of the present invention, and FIG. 9 is an inkjet head formed by joining the above-mentioned plates.

As shown in FIGS. 6 and 7, the inkjet head of the present invention has alignment through holes 21 and 22 formed on a bottom plate 24 on which an ink supply pipe 23 is provided. 22, an ink chamber 25 and a pressure chamber 26.
and an ink channel plate 28 with etched nozzles 27.
are layered. This ink channel plate 28 has a marker 2 for detecting the dimension l of the nozzle 27 to be formed.
9.30 is formed by etching. This marker 29 is formed in a rectangular shape near the nozzle 27 to be formed, and the marker 30 is formed on the ink flow path plate 27.
This marker 29.3 is provided in a rectangular shape on the side of the
The straight line 31 connecting the 0 sides is made to coincide with the tip of the nozzle 27 having a length l to be formed.

Furthermore, a diaphragm 32 is laminated on top of the ink flow path plate 28. This diaphragm 32 is provided with through holes 21 and 22 that serve as the reference for alignment, and in order to detect the markers 29 described above, through holes 33 are provided corresponding to the positions of the markers 29, Furthermore, this diaphragm 32
A semicircular through hole 34 for detecting the marker 30 is provided on the side surface of the marker.

In this way, when the bottom plate 24, ink flow path plate 28, and diaphragm 32 are stacked as shown in FIG. , and 30 can be easily detected, so there is no need to frequently measure the longitudinal dimension of the nozzle formed by polishing, and the tip of the nozzle 27 to be formed on the straight line 31 connecting the markers 29 and 30. It is a good idea to polish each plate until the area is reached.

Furthermore, since the positions of the markers 29 and 30 formed in this way are previously formed on the ink flow path plate, when the pins are inserted into the through holes 21 and 22 to join each plate, the pins and the through holes 29 and 22 are connected. Even if the position between .22 and 22 is shifted, the position of the marker 29 and 30, which are formed in correspondence with the position of the tip of the nozzle to be formed, will not change, and the absolute amount of deformation due to shrinkage of wax treatment etc. Also, the amount of deformation with respect to the size of the marker is calculated from the through hole 22 which is the reference hole,
Distance to the tip position of the nozzle to be formed II A I
This is sufficiently smaller than the amount of deformation. Therefore, a multilayer stainless steel plate including an ink channel plate can be polished while the longitudinal dimension and shape of the nozzle are accurately controlled.

In addition to this embodiment, the shape of the markers 29 and 30 is not limited to a rectangle, but may be any shape that is easy to recognize, such as a triangle, and the number of markers may be only one on the side of the ink channel plate 28, or Only one may be provided other than on the side.

Furthermore, in the case of a multi-nozzle head, a plurality of markers may be formed between each nozzle.

Furthermore, in addition to the embodiments described above, when a diaphragm is stacked and bonded to an ink flow path plate formed by processing ink flow paths such as nozzles and pressure chambers by half-etching, etc., in other words, the bottom plate is omitted. The present invention is applicable in any case.

Note that the ink end head of the present invention can be efficiently formed by forming a marker indicating the position of the tip of the nozzle at the same time as the etching step when forming the ink flow path.

(a) Effects of the Invention As described above, according to the inkjet head of the present invention, the longitudinal dimension of the nozzle of the inkjet head to be formed can be easily detected without frequent measurement during the polishing process. Even if the bottom plate, ink channel plate, and diaphragm are misaligned when overlapping each other when forming the head, the length of the formed nozzle will not change and the nozzle size will remain at the specified value. The effect is that a highly reliable inkjet head with well-controlled particle formation characteristics can be easily formed.

[Brief explanation of drawings]

Figure 1 is a plan view of the inkjet head, and Figure 2 is the top view of the inkjet head.
A sectional view taken along the line A-A', Figures 3 and 4.
5 and 5 are explanatory diagrams for forming a conventional inkjet head, and FIGS. 6 to 9 are explanatory diagrams for forming an inkjet head of the present invention. In the figure, 21 and 22 are through holes for positioning, 23
is an ink supply pipe, 24 is a bottom plate, 25 is an ink chamber, 26 is a pressure chamber, 27 is a nozzle, 2B is an ink channel plate, 29,
30 is a marker for alignment, 31 is a straight line connecting the markers, 32 is a diaphragm, 33 and 34 are through holes for marker detection, l is a nozzle size, and lI is a distance from a reference hole. Figure 1 2v! J Figure 6 Figure 8

Claims (1)

[Claims] In an inkjet head formed by bonding an ink flow path plate having nozzles for ejecting ink and at least one other substrate, 1. The ink flow path plate has a position corresponding to the fixed position of the tip of the nozzle. An inkjet head characterized in that a mark is provided on the substrate, and a through hole is provided in the substrate so that the mark can be detected from the substrate side.