JPH03175046A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To achieve improvement of efficiency in discharge of liquid by a method wherein a passage is formed by arranging a first passage board in opposition to a second passage board, which are composed of a first and a second grooves, a first and a second electrodes having a positional relation to the grooves, a third electrode, and a piezoelectric component provided be tween the electrodes. CONSTITUTION:A passage board is formed by arranging a first passage board 6 in opposition to a second passage board 7, and a nozzle 3 interconnecting with at least one or both of a first and a second grooves exists. A space be tween a first electrode 4 and a second electrode 5 which are provided to the first and the second passage boards 6, 7, is composed of a piezoelectric compo nent 8. Liquid is discharged from the nozzle 3 by variation in volume of a passage composed of the first and the second grooves 1, 2 by impressing voltage from a voltage impressing means.

Description

[Detailed description of the invention] Skin name Hokutate The present invention relates to an inkjet recording device.

Known documents describing the prior art related to the present invention include the following.

JP-A-56-56150 discloses that a piezoelectric plate made of a piezoelectric material is formed with cavity grooves, and a cover plate is joined to form a plurality of ink cavities. Japanese Patent No. 63-252750 discloses changing the volume of a pressurizing chamber by shear mode deformation.

Furthermore, Japanese Patent Application Laid-Open No. 56-56150 discloses that the ink cavity grooves are separated by slits, but this method has the following drawbacks. That is, (1) the liquid is discharged by contraction after being bonded to the cover plate 1, and does not utilize lateral deformation.

■Increasing the volume change during contraction requires increasing the cavity width, which reduces the nozzle integration.

■Since the electrodes are on the surface of the piezoelectric plate, mutual interference (crosstalk) is unavoidable.

Furthermore, the method described in JP-A-63-252750 has the disadvantage that polarization processing and electrode formation are complicated due to shear mode deformation (the polarization direction and the voltage application direction are perpendicular).

Furthermore, in the previously proposed inkjet recording apparatus, a flow path is formed by a flow path plate provided with first and second grooves and an elastic plate. However, the amyloid plate cannot prevent deformation due to differences in the mechanical restraint conditions of the flow path.

The ambiguous plate had a disadvantage in that it had the effect of absorbing the pressure (pressure at the time of discharging the liquid in the flow path during deformation) and reduced the efficiency of discharging the liquid.

The present invention was made in view of the above-mentioned circumstances.
First and second grooves, first and second electrodes that control the positional relationship with the grooves, a third electrode, and a piezoelectric member provided between the electrodes. The purpose of this invention is to provide an inkjet recording apparatus in which two flow path plates are arranged facing each other to form a flow path to improve liquid ejection efficiency.

Structure - Ichijo - In order to achieve the above-mentioned eleventh objective, the present invention provides (1) a first groove and a second groove shallower than the first groove.

an I electrode located above the bottom surface of the first groove and below the bottom surface of the second groove; a second electrode located above the first electrode; a piezoelectric member provided between a second electrode, first and second channel plates arranged to face each other, and a nozzle communicating with at least one or both of the first and second grooves; , the above-mentioned No. ■ and No. 2
(2) a first groove and a second groove shallower than the first groove; a first electrode located above the bottom surface of the second groove and below the bottom surface of the second groove; and a second electrode located on one side of the first electrode and below the bottom surface of the second groove. , a third electrode located equal to or above the bottom surface of the second groove;
a piezoelectric member provided between the electrodes of (3) a first groove; and a voltage applying means for applying a voltage to the piezoelectric members of the first and second flow path plates. a second groove shallower than the second groove;
a first electrode located above the bottom surface of the groove and below the bottom surface of the second groove; a second electrode located above the first electrode; a first channel plate comprising a piezoelectric member provided between the electrodes; a first groove; a second groove shallower than the first groove; a first electrode located above the first electrode and below the bottom surface of the second groove; a second electrode located above the first electrode and below the bottom surface of the second groove; a second flow path consisting of a third electrode located equal to or above the bottom surface of the groove, and a piezoelectric member provided between the first and second electrodes and between the second and third electrodes; a nozzle communicating with at least one or both of the first and second grooves;
and a voltage applying means for applying a voltage to the piezoelectric member of the second channel plate. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a configuration diagram for explaining an inkjet recording apparatus according to the present invention. In FIG. 1, 1 is a first groove, 2 is a second groove, 3 is a nozzle, 4 is a first electrode, and 5 is a second electrode, 6
7 is a first channel plate, 7 is a second channel plate, and 8 is a piezoelectric member.

The first and second channel plates 6 and 7 are arranged opposite to each other to form a channel plate, and the first and second grooves also have nozzles 3 communicating with at least one or both of them. First and second channel plates 6, 7
The gap between the first and second electrodes 4, 5 provided in The liquid is discharged from the nozzle 3 due to the change in volume of the flow path.

FIG. 2 is a diagram showing a first embodiment of the present invention, and the reference numbers in the figure are the same as those in FIG. 1.

The polarization direction is indicated by an arrow on the piezoelectric member 8 between the first and second electrodes 4 and 5, and G indicated on the electrode indicates the ground side, and H indicates the hole 1 side. When a voltage is applied to the piezoelectric members 8 of the first and second channel plates 6 and 7 so that they both expand, the volume of the second groove 2 changes and liquid is ejected from the nozzle communicating with the second groove 2. Ru.

FIG. 3 is a diagram showing a second embodiment of the present invention, and 16 is a diagram showing a first embodiment.
1 is a flow path plate, 17 is a second flow path plate, and other parts having the same functions as in FIG. 1 are given the same reference numerals as in FIG.

When a voltage is applied to the piezoelectric members 8 of the first and second channel plates 16 and 17 so that they both contract, liquid is released from the nozzle communicating with the second groove 2 due to a change in the volume of the second groove 2. It is discharged.

FIG. 4 is a diagram showing a third embodiment of the present invention, in which 9 is a third electrode, 26 is a first channel plate, 27 is a second channel plate, and other functions similar to those in FIG. The parts shown in FIG. 1 have the same reference numerals as in FIG. Two piezoelectric members 8 are provided in the first and second channel plates 26, 27, and the piezoelectric member 8 between the first and second electrodes 4, 5 is contracted, and the second and third electrodes +45 When the piezoelectric member 8 between . At this time, the volume change becomes large due to this expansion and contraction, so that the efficiency of liquid discharge improves.

FIG. 5 is a diagram showing a fourth embodiment of the present invention, and FIG.
This is a case where the first embodiment (FIG. 2) and the second embodiment (FIG. 3) are combined. The piezoelectric member 8 of the first channel plate 6 expands;
When a voltage is applied to the piezoelectric member 8 of the second channel plate 7 so as to contract it, the volume of the second groove 2 changes and liquid is ejected from the nozzle communicating with the second groove 2 . In this way, by expanding the piezoelectric member 8 of the first channel plate 6 and contracting the piezoelectric member 8 of the second channel plate 7, the upper part of the second channel plate 7 (A-A' A state is obtained in which there is almost no upward deformation of the space (between).

FIG. 6 is a diagram showing a fifth embodiment of the present invention, which is a combination of the second embodiment (FIG. 3) and the third embodiment (FIG. 4).

In Figs. 2 and 4, there is a slight upward deformation of A-A', and in Fig. 3, there is a slight downward deformation of A-A'.
This is because when a multi-nozzle head ejects liquid from multiple nozzles at the same time, there is a slight difference in droplet speed and mutual interference occurs, as shown in FIG.

In FIG. 6, since there is almost no deformation between A and A', liquid can be ejected without mutual interference.

Effects As is clear from the above explanation, according to the present invention,
and a second groove, first and second 'e4L poles having a positional relationship with the groove, and a third electrode and a piezoelectric member provided between the electrodes. Since the flow path is formed by arranging the two flow path plates facing each other, the liquid discharge efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining an inkjet recording apparatus according to the present invention, and FIGS. 2 to 6 are diagrams showing embodiments of the present invention. DESCRIPTION OF SYMBOLS 1...First groove, 2...Second groove, 3...Nozzle, 4...First electrode, 5...Second electrode, 6,1
6, 26... First channel plate, 7, 17. 27... Second channel plate, 8... Piezoelectric member, 9... Third electrode.

Claims (1)

[Claims] 1. A first groove, a second groove shallower than the first groove, and a groove above the bottom of the first groove and below the bottom of the second groove. a first electrode located above the first electrode; a second electrode located above the first electrode; and a piezoelectric member provided between the first and second electrodes. and a second channel plate, a nozzle communicating with at least one or both of the first and second grooves, and voltage applying means for applying a voltage to the piezoelectric members of the first and second channel plates. An inkjet recording device comprising: 2. a first groove, a second groove shallower than the first groove, and a first groove located above the bottom surface of the first groove and below the bottom surface of the second groove; an electrode, a second electrode located above the first electrode and below the bottom surface of the second groove, and a third electrode located equal to or above the bottom surface of the second groove; between the first and second electrodes and the second
and a piezoelectric member provided between a third electrode, and a nozzle that communicates with at least one or both of the first and second channel plates that are arranged to face each other and the first and second grooves. and a voltage applying means for applying a voltage to the piezoelectric members of the first and second channel plates.