JPS60183159A - inkjet head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (al Technical field of invention The present invention relates to improvements in inkjet heads.

(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 in which printing ink is ejected onto a recording paper from a nozzle communicating with a pressure chamber is well known. This inkjet recording method is a non-impact recording method, generates little noise during print recording, and has good recording quality, so it has recently become widely used for recording information output from electronic computers.

tc> Prior art and problems Figure 1 is a plan view of such an inkjet head.
FIG. 2 is a sectional view of FIG. 1 taken along line I--n. As shown in FIGS. 1 and 2, on a substrate 1 made of a thin plate made of stainless steel, there is a pressure chamber 3 that accommodates ink and transmits the pressure generated by a piezoelectric element 2, and a pressure chamber 3 that is connected to the pressure chamber 3. An ink flow path plate 6 is laminated in which an ink flow path is formed by etching or the like, and includes a nozzle 4 that communicates with the recording paper by ejecting ink for recording, and an ink chamber 5 that supplies ink to the pressure chamber 3. There is.

A diaphragm 8 is provided with a piezoelectric element 2 and an ink supply pipe 7 for supplying ink to the ink chamber 5 on the ink channel plate 6.
are laminated, and the substrate 1, ink channel plate 6, and diaphragm 8 are bonded together using a brazing method, etc., and the nozzle surfaces of the substrate 1, ink channel slope 6, and diaphragm 8 are After polishing, the longitudinal dimension of the nozzle 4 has a predetermined value.

To explain this in more detail, as shown in Figure 3, the pin (
As shown in FIG.
, pressure chamber 3, common ink chamber 5, through hole 11A, IIB
An ink flow path plate 6 having an ink flow path plate 6 formed thereon is laminated thereon, and a diaphragm 8 having through holes 11^, 11B and an ink supply pipe 7 formed thereon as shown in FIG. 5 is further laminated thereon. Next, this is joined with the pins being inserted into the respective through holes 11A and IIB of the ring base Fj, ■, the ink flow path plate 6, and the diaphragm 8, and the surface A side of the joined vertical layer plate is The nozzle 4 is formed by cutting and wrapping so that the longitudinal dimension of the nozzle 4 becomes a predetermined value.

By the way, conventionally, the longitudinal dimension of this nozzle 4 is
As shown in the figure, by measuring the dimension β from the center O of the through hole 11B (this hole serves as the dimension reference hole) to the polished part of the three-layer stainless steel plate joined, the nozzle 4 is It was detected whether the dimensions of the machine matched the design values or not.

However, with such conventional inkjet heads, the value of the dimension l described above must be measured frequently during the polishing process, and the positional deviation of each plate that occurs when laminating each plate, the substrate, and the ink must be measured frequently. When joining the flow path plate and diaphragm using the soldering method, the nozzle dimensions do not meet the design values due to heating of the slopes of these plates and shrinkage due to cooling. Since the value is not controlled, there is a drawback that an inkjet head having desired ink particle formation characteristics cannot be obtained.

(dl) Purpose of the Invention The present invention aims to eliminate the above-mentioned drawbacks by forming a nozzle tip on the side surface of an ink flow path plate in which ink flow paths such as nozzles and pressure chambers are formed so that the nozzle dimensions have a predetermined value. By adding a mark in advance to indicate the planned position, you can save the trouble of measuring the nozzle dimensions frequently when polishing the stainless steel plates after joining to make the longitudinal dimension of the nozzle a predetermined value. The object of the present invention is to provide a novel inkjet head in which a desired nozzle length in the longitudinal direction can be obtained even if each plate is deformed due to errors during assembly or heat shrinkage due to soldering.

(e) Structure of the Invention To achieve the above object, an inkjet head of the present invention is an inkjet head formed by joining an ink flow path plate having nozzles for jetting and recording ink and at least one other substrate. The ink flow path plate is characterized in that a mark that can be recognized from the outside is provided at a position corresponding to the tip position of the nozzle on at least one side surface of the ink flow path plate after bonding.

(fl Embodiment of the Invention Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 6 is a plan view showing a first embodiment of an ink channel plate constituting an inkjet head of the present invention, and FIG. 7 is a plan view showing a second embodiment of an ink channel plate constituting an inkjet head of the present invention. FIG.

As shown in FIG. 6, on both side surfaces of the ink passage plate 21 for the inkjet printer head configuration of the present invention, there are marks corresponding to position B of the tip of the nozzle having a predetermined size to be formed by polishing. A concave cutting groove 22 is provided in advance by etching or the like. The concave cutting grooves 22 provided on both sides of the ink flow path plate 21 are
Even if the substrates and diaphragm are stacked on top and bottom of the channel plate 21 and joined by soldering, it is possible to easily observe from the side of the channel plate 21, and therefore the longitudinal direction of the nozzle formed by polishing can be There is no need to measure dimensions frequently,
It is preferable to polish each soldered plate to the position of the edge of this cutting groove 22. Also, the cutting groove 2 formed in this way
Since the position 2 is formed in the pre-stamped ink channel plate, when the pins are inserted into the through-holes 11A and IIB to join each plate, the pin and the through-holes 11A and IIB are connected to each other.
Even if the position between the grooves 22 and 22 is shifted, the position of the cutting groove 22 that is formed corresponding to the position of the tip of the nozzle to be formed will not change, and the absolute amount of deformation due to shrinkage of the wax treatment etc. The amount of deformation of the cutting groove 22 relative to the human size is sufficiently smaller than the amount of deformation relative to the dimension l from the reference hole N through hole 11 [1], so the longitudinal dimension of the nozzle is accurately controlled. Multi-layer stainless steel plates including ink channel plates can be polished using this method.

Further, in addition to this embodiment, a structure may be adopted in which cutting grooves are provided on other sides of the ink flow path plate.

Furthermore, as shown in FIG. 7, the shape of the cutting groove 22 described above is not a concave shape, but a cutting groove 31 in which a protrusion is provided in the center and the concave area is widened, and the nozzle to be formed with the protrusion is formed. By making the cutting groove correspond to the position of the tip of the nozzle, and also making the cut groove correspond to the nozzle end position C, when the substrate and the diaphragm are layered vertically with this ink channel plate 32 in between, Compared to the first embodiment, it is easier to detect the position of the tip of the nozzle to be formed, and by measuring the distance from the cutting groove corresponding to the nozzle end position C, the nozzle length can be further adjusted.
E can be set exactly and arbitrarily.

In addition to the embodiments described above, there is a case where a diaphragm is stacked and bonded on an ink flow path plate formed by processing ink flow paths such as nozzles and pressure chambers by half etching etc. (when the bottom plate is omitted). ), the present invention is also applicable.

Note that the present invention can be carried out efficiently if a mark indicating the nozzle tip position is formed at the same time as the ink flow path is formed.

(8) Effects of the Invention As described above, according to the ink chef head of the present invention, the longitudinal dimension of the nozzle of the inkjet head to be formed can be measured without frequent measurement during the polishing process.
It can be easily detected, and even if the substrate, ink channel plate, and diaphragm are misaligned when overlapping each other when forming an inkjet head, the length of the formed nozzle will not change. This produces the effect that an inkjet head with nozzle dimensions controlled to a predetermined value can be easily formed.

[Brief explanation of the drawing]

Figure 1 is a plan view of the inkjet head, and Figure 2 is the top view of the inkjet head.
A cross-sectional view of the figure taken along the ill line, Figures 3, 4, and 4.
, and FIG. 5 are explanatory views when forming an inkjet head, FIG. 6 is a plan view showing a first embodiment of an ink channel plate constituting the inkjet head of the present invention, and FIG. 7 is a plan view of the present invention. FIG. 7 is a plan view showing a second embodiment of an ink flow path plate constituting the inkjet head of the invention. In the figure, 1 is a substrate, 2 is a piezoelectric element, 3 is a pressure chamber, and 4 is a
is a nozzle, 5 is a common ink chamber, 6.2L32 is an ink flow path plate, 7 is an ink supply pipe, IIA, 118 is a through hole,
22.31 is the cutting groove, ^ is the end of the ink channel plate, II is the position of the tip of the nozzle, C is the end position of the nozzle, D is the edge of the cutting groove, 0 is the through hole 1111 which is the reference hole. Indicates the center. 1st FM

Claims (1)

[Claims] An inkjet head formed by bonding an ink flow path plate having nozzles for ejecting ink and at least one other substrate, wherein tips of the nozzles are provided on at least one side of the ink flow path plate. An inkjet head characterized by being provided with marks corresponding to fixed positions.