JP2001199063A - Ink jet head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet head that enables high resolution of a nozzle by maintaining a rigidity of a partition wall of a pressure chamber. SOLUTION: The ink jet head comprises a means for enhancing the rigidity of the pressure chamber partition wall 9 for partitioning the adjacent pressure chambers 4, 4 by making a part of the partition wall 9 to be a thick part 9a to reduce a crosstalk between the partition wall 9 and the pressure chamber 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for receiving print data and causing ink droplets to fly based on the data.
The present invention relates to an on-demand type ink jet head for forming dots on a recording medium using the ink droplets.

[0002]

2. Description of the Related Art There are various recording systems for recording data on a recording medium. As one of the recording apparatuses, there is a recording apparatus using an on-demand type ink jet head which receives input of print data, flies ink droplets based on the data, and forms dots on a recording medium by the ink droplets. is there.

An ink jet head of this type will be described with reference to FIGS. As shown in FIG. 8, this type of ink jet head is provided with pressure chambers 4 which are separated from each other by a pressure chamber partition 9 between a supply port plate 10 and a vibration plate 8. The piezoelectric element 5 is mounted on the vibrating plate 8 at the position thus set, and the pressure generated by the vibration (deformation by the unimorph effect) of the piezoelectric element 5 and the vibrating plate 8 is applied to the pressure chamber 4 as shown in FIG. It is configured to record data by causing ink to fly from the pressure chamber 4 through the nozzle 1.

As shown in FIG. 7, one end of a pressure chamber 4 of an ink jet head communicates with an ink pool 6 via an ink supply port 3, and a nozzle 1 is opened at the other end.
The nozzle 1 communicates with the inside of the pressure chamber 4 via the nozzle communication hole 2. In FIG. 7, the ink in the ink pool 6 flows in the direction of the arrow indicating the flow of the ink.

Further, as shown in FIG. 7, the pressure chambers 4 of the ink jet head are arranged adjacently and parallel to each other with their nozzles 1 facing in the same direction, and the space between the adjacent pressure chambers 4 is shown in FIG. As shown, it is isolated by a pressure chamber partition 9.

This type of ink jet head is required to record data corresponding to high image quality, particularly high quality image data, so that the pitch between the nozzles 1 is narrowed, that is, the nozzles 1 have a high density. It is necessary to implement it.

[0007]

However, in order to mount the nozzle 1 at a high density, it is necessary to reduce the distance between the adjacent pressure chambers 4, and accordingly, the pressure for separating the adjacent pressure chambers 4 from each other is required. The chamber partition 9 becomes thinner, and thus the rigidity of the pressure chamber partition 9 decreases.

When the rigidity of the pressure chamber partition 9 decreases as shown in FIG. 9, when the piezoelectric element 5 and the vibration plate 8 vibrate, the pressure chamber partition 9 having low rigidity is easily deformed and transmitted from the vibration plate 8. This causes a crosstalk phenomenon that vibration is transmitted to the adjacent pressure chamber 4. That is, when the piezoelectric element 5 is driven, not only does the piezoelectric element 5 and the vibration plate 8 bend (vibrate) inside the pressure chamber 4 due to the unimorph effect, but in fact, the pressure chamber partition 9 becomes inside the pressure chamber 4. It will bend.

Therefore, the adjacent pressure chambers 4 are affected by the deformation of the pressure chamber partition walls 9 and have a great effect on ink ejection.

Therefore, conventionally, various measures have been taken to prevent the above-mentioned crosstalk.

One of the measures for preventing crosstalk is described in, for example, Japanese Patent Application Laid-Open No. 7-156384. The countermeasure for preventing crosstalk described in Japanese Patent Application Laid-Open No. 7-156384 requires extra processing work and members, and is not suitable for mass production.

An object of the present invention is to easily provide an ink jet head which can cope with high density of nozzles while maintaining rigidity of a pressure chamber partition wall.

[0013]

In order to achieve the above object, an ink jet head according to the present invention applies a pressure by a piezoelectric element and a diaphragm to a pressure chamber to which ink is supplied. An ink jet head for recording data by flying the pressure chamber, wherein a part of the pressure chamber partition separating the adjacent pressure chambers is thickened to increase rigidity, and the pressure chamber partition crosses the pressure chamber. This is to reduce the talk.

The ink jet head according to the present invention records data by applying pressure from a piezoelectric element and a vibrating plate to a pressure chamber to which ink is supplied and causing the ink to fly from the pressure chamber through a nozzle. Wherein the thickness of the pressure chamber partition wall separating the adjacent pressure chambers on the diaphragm side and the thickness of the nozzle side located on the side opposite to the diaphragm side are different from each other, It is to increase the rigidity of the chamber partition and reduce crosstalk to the pressure chamber by the pressure chamber partition.

The ink jet head according to the present invention records data by applying pressure from a piezoelectric element and a vibrating plate to a pressure chamber to which ink is supplied and causing ink to fly from the pressure chamber through a nozzle. An ink pool that supplies ink to the pressure chambers and the pressure chambers are provided at non-overlapping positions to increase the rigidity of the pressure chamber partition walls and reduce crosstalk between adjacent pressure chambers. It is.

Further, the ink jet head according to the present invention is an ink jet head for recording data by applying pressure from a piezoelectric element and a vibration plate to a pressure chamber to which ink is supplied and causing the ink to fly from the pressure chamber through a nozzle. The thickness of a part of the pressure chamber partition separating the adjacent pressure chambers is increased in rigidity as a thick portion, and the thickness of the pressure chamber partition separating the adjacent pressure chambers on the diaphragm side, By making the thickness of the nozzle side located on the side opposite to the diaphragm side different, the rigidity of the pressure chamber partition is increased, and crosstalk to the pressure chamber by the pressure chamber partition is reduced.

Further, the ink jet head according to the present invention is an ink jet head for recording data by applying pressure from a piezoelectric element and a vibration plate to a pressure chamber to which ink is supplied and causing ink to fly from the pressure chamber through a nozzle. In addition, a part of the pressure chamber partition separating the adjacent pressure chambers is thickened to increase rigidity, reduce crosstalk to the pressure chambers due to the pressure chamber partition, and further inject ink into the pressure chambers. An ink pool to be supplied and the pressure chamber are provided at positions where they do not overlap with each other to increase the rigidity of the pressure chamber partition walls and reduce crosstalk between adjacent pressure chambers.

The ink jet head according to the present invention records data by applying pressure from a piezoelectric element and a vibrating plate to a pressure chamber to which ink is supplied and causing the ink to fly from the pressure chamber through a nozzle. Wherein the thickness of the pressure chamber partition wall separating the adjacent pressure chambers on the diaphragm side and the thickness of the nozzle side located on the side opposite to the diaphragm side are different from each other, Increasing the rigidity of the chamber partition, reducing crosstalk to the pressure chamber by the pressure chamber partition, and further providing an ink pool for supplying ink to the pressure chamber and the pressure chamber at a position where they do not overlap with each other; And increases cross-talk between the adjacent pressure chambers.

Further, the ink jet head according to the present invention is an ink jet head for recording data by applying pressure from a piezoelectric element and a vibration plate to a pressure chamber to which ink is supplied and causing the ink to fly from the pressure chamber through a nozzle. The thickness of a part of the pressure chamber partition separating the adjacent pressure chambers is increased in rigidity as a thick portion, and the thickness of the pressure chamber partition separating the adjacent pressure chambers on the diaphragm side, The thickness of the nozzle side located on the side opposite to the diaphragm side is made different to increase the rigidity of the pressure chamber partition, reduce crosstalk to the pressure chamber by the pressure chamber partition, and further reduce the pressure. An ink pool for supplying ink to the chamber and the pressure chamber are provided at positions where they do not overlap with each other to increase the rigidity of the pressure chamber partition walls and reduce crosstalk between adjacent pressure chambers.

In addition, a portion of the side wall of the pressure chamber projects inward to increase rigidity by making a part of the pressure chamber partition wall a thick portion.

Further, when the pressure chamber has an elongated shape, the vicinity of the center in the longitudinal direction of the pressure chamber is thickened to increase rigidity.

Further, the thickness of the pressure chamber partition wall is increased in a tapered shape from the vibration plate side to the nozzle side.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

In the ink jet head according to the present invention shown in the drawing, a pressure is applied by a piezoelectric element 5 and a vibrating plate 8 to a pressure chamber 4 to which ink is supplied, and the ink is caused to fly through the nozzle 1 from the pressure chamber 4 so that data can be obtained. The present invention is directed to an ink-jet head that performs the above-described recording, and basically proposes three modes as measures for preventing crosstalk, which has been a problem in the past.

That is, in the ink jet head according to the present invention shown in FIG. 1, a part of the pressure chamber partition 9 for separating the adjacent pressure chambers 4 and 4 is made thicker 9a to increase rigidity, and the pressure by the pressure chamber partition 9 is increased. Measures are taken to reduce crosstalk to room 4.

The ink jet head according to the present invention shown in FIG. 3 has a piezoelectric element 5 in a pressure chamber 4 to which ink is supplied.
And an ink jet head for recording data by applying ink from the pressure chamber 4 to the nozzle 1 by applying pressure from the vibration plate 8 to the adjacent pressure chambers 4 and 4.
A thickness t1 of the pressure chamber partition wall 9 for separating the pressure chamber from the diaphragm 8 side,
The thickness of the pressure chamber partition 9 is increased by making the thickness t2 of the nozzle 1 located on the opposite side of the diaphragm 8 different from that of the nozzle 1 so that the crosstalk of the pressure chamber partition 9 to the pressure chamber 4 is reduced. Take steps to reduce it.

The ink jet head according to the present invention shown in FIG. 6 has a piezoelectric element 5 in a pressure chamber 4 to which ink is supplied.
And an ink jet head for applying ink pressure from the vibrating plate 8 to fly ink from the pressure chamber 4 through the nozzle 1 to record data. The ink pool 6 for supplying ink to the pressure chamber 4 and the pressure A means is provided for providing the chamber 4 at a position where the pressure chamber 4 does not overlap, increasing the rigidity of the pressure chamber partition wall, and reducing crosstalk between the adjacent pressure chambers 4 and 4.

As described above, the countermeasures for preventing crosstalk in the present invention are based on the basic three measures shown in FIGS. 1, 3 and 6.
Although it is an aspect, by appropriately combining them, it is possible to further effectively prevent crosstalk.

That is, in the ink jet head according to the present invention based on the combination of the measures for preventing crosstalk shown in FIGS. 1 and 3, a part of the pressure chamber partition 9 for separating the adjacent pressure chambers 4, 4 is thickened. The thickness t1 on the diaphragm 8 side of the pressure chamber partition 9 for increasing the rigidity as the wall portion 9a and isolating between the adjacent pressure chambers 4 and 4 and the nozzle 1 side located on the side opposite to the diaphragm 8 side The rigidity of the pressure chamber partition 9 is increased by making the wall thickness t2 different, and the pressure chamber 4 is formed by the pressure chamber partition 9.
This is a mode in which a means for reducing crosstalk to the device is taken.

The ink jet head according to the present invention based on the combination of the crosstalk prevention measures shown in FIGS. 1 and 6 has a structure in which a part of the pressure chamber partition wall 9 for separating the adjacent pressure chambers 4 and 4 is thickened. The rigidity is increased as the meat portion 9a, and the crosstalk to the pressure chamber 4 by the pressure chamber partition 9 is reduced,
Further, an ink pool 6 for supplying ink to the pressure chamber 4
The pressure chamber 4 and the pressure chamber 4 are provided at positions where they do not overlap with each other to increase the rigidity of the pressure chamber partition wall, and take measures to reduce crosstalk between the adjacent pressure chambers 4 and 4.

The ink jet head according to the present invention based on the combination of the measures for preventing crosstalk shown in FIGS. 3 and 6 provides a pressure chamber partition 9 for separating the adjacent pressure chambers 4, 4 from the diaphragm 8 side. The thickness t1 of the pressure chamber and the thickness t2 of the nozzle 1 located on the side opposite to the diaphragm 8 side are made different from each other to increase the rigidity of the pressure chamber partition 9 and to the pressure chamber 4 by the pressure chamber partition 9. In addition, an ink pool 6 for supplying ink to the pressure chambers 4 and the pressure chambers 4 are provided at positions where the pressure chambers 4 do not overlap with each other to increase the rigidity of the pressure chamber partition walls. This is a mode in which a means for reducing crosstalk between them is taken.

The ink jet head according to the present invention, which is based on the combination of the measures for preventing crosstalk shown in FIGS. 1, 3 and 6, has a structure in which one of the pressure chamber partition walls 9 separates the adjacent pressure chambers 4, 4. Pressure chamber partition 9 for increasing rigidity and isolating between adjacent pressure chambers 4 and 4 as a thick portion 9a.
The thickness t1 on the side of the diaphragm 8 and the thickness t2 on the side of the nozzle 1 located on the side opposite to the side of the diaphragm 8 are made different from each other to increase the rigidity of the pressure chamber partition walls 9. Crosstalk to the pressure chamber 4 is reduced, and an ink pool 6 for supplying ink to the pressure chamber 4 and the pressure chamber 4 are provided at positions not overlapping with each other to increase the rigidity of the pressure chamber partition wall. This is a mode in which means for reducing crosstalk between the pressure chambers 4 and 4 is taken.

As described above, according to the present invention, the rigidity of the pressure chamber partition walls 9 / the pressure chamber partition walls can be increased while maintaining the high density of the nozzles. The crosstalk can be effectively prevented by preventing the bending of the image, and high quality printing can be performed.

Next, three basic embodiments of the present invention will be described with reference to specific examples. In addition, 3 explained using the specific example
It goes without saying that crosstalk can be further effectively prevented by appropriately combining the modes as described above.

(Embodiment 1) FIG. 1 (a) is a configuration diagram showing Embodiment 1 of the present invention, FIG. 1 (b) is an enlarged view of a main part of FIG. 1 (a), and FIG. FIG. 2B is a sectional view taken along line AA, and FIG. 2 is a sectional view taken along line BB in FIG.

The ink jet head according to the first embodiment of the present invention shown in FIGS. 1 and 2 includes a nozzle plate 7, a pool plate 14, a supply port plate 10, a pressure chamber plate 15, a vibration plate 8, and a piezoelectric element 5. It is configured by stacking.

As shown in FIG. 2, an elongated through hole corresponding to the pressure chamber 4 for applying pressure to the ink is opened adjacent to and parallel to the pressure chamber plate 15, and one end of the elongated through hole is provided. The opening is closed by the diaphragm 8 laminated on the pressure chamber plate 15, and the other end of the elongated through-hole is formed on the supply port plate 10 laminated on the pressure chamber plate 15 on the side opposite to the diaphragm 8. The pressure chambers 4 are respectively formed in the elongated through holes. A piezoelectric element 5 is provided on the back surface of the diaphragm 8 corresponding to the pressure chamber 4.
Are respectively attached. Therefore, when the piezoelectric element 5 and the diaphragm 8 bend inward of the pressure chamber 4 due to the unimorph effect, the ejection pressure is applied to the ink in the pressure chamber 4 in accordance with the bending.

As shown in FIG. 2, a through hole corresponding to the ink pool 6 is opened in the pool plate 14.
One end opening of the through hole is closed by the supply port plate 10 laminated on the pool plate 14, and the other end opening of the through hole is laminated on the pool plate 14 on the opposite side to the supply port plate 10. The ink pools 6 are respectively formed in the portions of the through holes which are closed by the nozzle plate 7.

Further, as shown in FIG. 2, a part of the pressure chamber plate 15 sandwiched between the two nozzles 1 functions as a pressure chamber partition 11 for isolating the pressure chambers 4 and 4 from each other.

As shown in FIG. 2, the nozzle plate 7
The ink jet nozzles 1 are formed corresponding to the respective pressure chambers 4, and the pool plate 14 and the supply port plate 10 are formed.
Is provided with a nozzle communication hole 2 for communicating the nozzle 1 with the pressure chamber 4, and the supply port plate 10 is provided with an ink supply hole 3 for communicating the ink pool 6 with the pressure chamber 4. I have.

Further, as shown in FIG. 1 (a), the pressure chambers (elongated through holes opened in the pressure chamber plate 15) 4 of the ink jet head are arranged adjacent to and parallel to the nozzle 1 in the same direction. And the adjacent pressure chamber 4
Are separated by a pressure chamber partition 9 as shown in FIGS. 1 (b) and 1 (c). The pressure chamber partition 9 is constituted by using a pressure chamber plate 15 extending along the length direction of the pressure chamber 4. When the piezoelectric element 5 and the vibration plate 8 vibrate by the unimorph effect, the pressure chamber partition 9 is formed. It is known that stress acts and causes crosstalk.

As shown in FIG. 2, a part of the pressure chamber plate 15 sandwiched between the two nozzles 1 is arranged in a row as shown in FIG. It functions as a pressure chamber partition 11 for isolation.

As described above, with the demand for higher image quality and higher speed for the ink jet head, it is necessary to realize a higher density of the nozzles 1. As a result, the interval (pitch) between the adjacent pressure chambers 4 is reduced, and the pressure chamber partition walls 9 (which may be the target of the pressure chamber partition 11 in some cases) separating the adjacent pressure chambers 4 are thinned. The rigidity will be reduced. Cross-talk occurs due to the reduction in rigidity, which leads to deterioration in print image quality.

Therefore, in the ink jet head according to the first embodiment of the present invention, the thickness (width) of the pressure chamber partition wall 9 is increased near the center in the length direction of the elongated pressure chamber 4 from the other portions to increase the thickness. 9a is provided to increase the rigidity of the piezoelectric element 5 and the diaphragm 8 against the stress applied to the pressure chamber partition 9 when the vibrating plate 8 vibrates by the unimorph effect. Is suppressed.

In the ink jet head according to the first embodiment of the present invention shown in FIGS. 1A, 1B and 1C, the side wall of the pressure chamber 4 is formed near the center of the elongated pressure chamber 4 in the longitudinal direction. By projecting inward of the pressure chamber 4, the thickness (width) of the pressure chamber partition 9 for isolating the adjacent pressure chambers 4 from each other is increased near the center in the length direction of the elongated pressure chamber 4 than other portions. A thick portion 9a is provided.

The shape of the pressure chamber 4 is empirically elongated for the purpose of achieving the function of causing the ink to fly from the nozzle 1.
In general, it has been found that a rectangular parallelepiped shape is desirable, but the dimensions are on the order of tens to hundreds of microns, and the piezoelectric element 5 and the diaphragm 8 vibrate by the unimorph effect. When stress is applied to the pressure chamber partition 9 at this time, the pressure chamber partition 9 bends inward of the pressure chamber 4 near the center of the pressure chamber 4 as shown in FIG. Was done.

According to the first embodiment of the present invention, the thickness (width) of the pressure chamber partition wall 9 is made thicker near the center of the elongated pressure chamber 4 in the length direction than other portions to provide the thick wall portion 9a. Since the rigidity against the stress applied to the pressure chamber partition 9 when the piezoelectric element 5 and the diaphragm 8 vibrate by the unimorph effect is increased,
The pressure chamber partition 9 is hardly bent near the center in the length direction of the pressure chamber 4, and the amount of bending of the pressure chamber partition 9 toward the pressure chamber 4 is reduced, so that the crosstalk due to the bending of the pressure chamber partition is reduced. Can be suppressed.

In the first embodiment of the present invention shown in FIG. 1, the side wall of the pressure chamber 4 at the center in the longitudinal direction of the elongated pressure chamber 4 protrudes inward of the pressure chamber 4. Although the wall thickness of the partition wall 9 is increased, the side wall of the pressure chamber 4 is gradually projected from the vicinity of the end 4a of the pressure chamber 4 toward the inside of the pressure chamber 4, and the amount of protrusion is maximized near the center. Well,
The present invention is not limited to the embodiments shown in FIGS. 1B and 1C.

In the first embodiment of the present invention, in order to suppress crosstalk to the adjacent pressure chamber 4, the pressure chamber partition 9
Although the present invention has been applied to the above, the present invention may be applied to another pressure chamber partition 11 for isolating adjacent pressure chambers 4.

(Embodiment 2) FIG. 3 shows Embodiment 2 of the present invention.
FIG. The ink jet head according to the second embodiment of the present invention shown in FIG. 3 has a thickness t1 on the diaphragm 8 side of the pressure chamber partition wall 9 that separates the adjacent pressure chambers 4 from each other.
The thickness t2 of the nozzle 1 located on the side opposite to the diaphragm 8 is increased to increase the rigidity of the entire pressure chamber partition 9 and reduce crosstalk to the pressure chamber 4 by the pressure chamber partition 9. .

In the ink jet head according to the second embodiment of the present invention shown in FIG. 3, the thickness t1 on the diaphragm 8 side of the pressure chamber partition 9 separating the adjacent pressure chambers 4 and 4 is such that the nozzle 1 has a high density. This is equivalent to the thickness of the pressure chamber partition wall 9 that has become thinner, and the thickness t2 of the nozzle 1 located on the side opposite to the diaphragm 8 side from the thickness t1 is tapered. .

According to the second embodiment of the present invention, the sectional shape of the pressure chamber partition wall 9 is such that the thickness t2 of the nozzle 1 located on the side opposite to the diaphragm 8 side from the thickness t1 of the diaphragm 8 side is tapered. Since the cross-sectional shape extends over the entire length of the elongated pressure chamber 4, the rigidity of the pressure chamber partition 9 is increased over the entire length of the pressure chamber 4. Crosstalk to the pressure chamber 4 by the partition wall 9 can be effectively suppressed.

(Embodiment 3) FIG. 5 shows Embodiment 3 of the present invention.
FIG. 6 is a sectional view taken along line CC of FIG.

The ink jet head according to the third embodiment of the present invention shown in FIGS. 5 and 6 applies a pressure from a piezoelectric element 5 and a vibrating plate 8 to a pressure chamber 4 to which ink is supplied. An ink pool for supplying ink to the pressure chamber and an ink pool for supplying ink to the pressure chamber.
Are provided at positions where they do not overlap with each other to increase the rigidity of the pressure chamber partition walls, and to reduce crosstalk between the adjacent pressure chambers 4 and 4.

The ink jet head according to the third embodiment of the present invention shown in FIGS. 5 and 6 is obtained by stacking the nozzle plate 7, the pressure chamber plate 15a, the supply path plate 18, the vibration plate 8, and the piezoelectric element 5. It is composed.

As shown in FIG. 6, an elongated recess corresponding to the pressure chamber 4 for applying pressure to the ink is opened adjacent to and parallel to the pressure chamber plate 15a. The opening of the elongated recess is The pressure chambers 4 are respectively formed in the elongated concave portions, which are closed by the vibration plate 8.
Further, a piezoelectric element 5 is mounted on the rear surface of the vibration plate 8 corresponding to the pressure chamber 4. Therefore, when the piezoelectric element 5 and the diaphragm 8 bend inward of the pressure chamber 4 due to the unimorph effect, the ejection pressure is applied to the ink in the pressure chamber 4 in accordance with the bending.

As shown in FIG. 6, in the pressure chamber plate 15a, a through hole corresponding to the ink pool 6 is provided so as to be shifted so as not to overlap with a concave portion corresponding to the pressure chamber 4, and the opening of the through hole is provided. Is closed by the vibration plate 8 and the nozzle plate 7, and the ink pool 6 is formed in the through hole at a position not overlapping the pressure chamber 4.

The ink pool 6 and the pressure chamber 4 communicate with each other through an ink supply path 17 provided in a supply path plate 18, and the pressure chamber 4 communicates with the nozzle 1 of the nozzle plate 7 through the nozzle communication hole 2. are doing.

As shown in FIG. 6, a part of the pressure chamber plate 15a sandwiched between the two nozzles 1 functions as a pressure chamber partition 11 for isolating the pressure chambers 4, 4.

Further, as shown in FIG. 5, the pressure chambers 4 of the ink-jet head (elongated concave portions opened in the pressure chamber plate 15a) are arranged in parallel with the nozzles 1 adjacent to each other in the same direction. Adjacent pressure chambers 4 are separated from each other by pressure chamber partition walls 9. The pressure chamber partition 9 is provided with a pressure chamber plate 15a along the length direction of the pressure chamber 4.
It is configured using

As shown in FIG. 6, a part of the supply path plate 18 sandwiched between the two nozzles 1 is arranged in a row as shown in FIG. It functions as a partition 11.

According to the third embodiment of the present invention, the pressure chamber 4 and the ink pool 6 are shifted from each other to a position where they do not overlap each other, and the pressure chamber 4 and the ink pool 6 are formed by the same pressure chamber plate 15a. Since the pressure chamber 4 and the ink pool 6, which are hollow, do not exist near the pressure chamber partition 9, a factor that lowers the rigidity of the pressure chamber partition 9 is eliminated. As a result, the rigidity of the pressure chamber partition 9 is increased. This has the advantage that crosstalk can be suppressed.

In the embodiment of the present invention, the present invention is applied to the pressure chamber partition 9 in order to suppress crosstalk to the adjacent pressure chamber 4. However, another pressure chamber partition separating the adjacent pressure chamber 4 is used. 11 may be applied.

In the embodiment of the present invention, a single-plate type piezoelectric element 5 as shown in FIG. 2 is used.
The present invention is not limited to an ink jet head using a single-plate type piezoelectric element, but can be similarly applied to an ink jet head using a laminated type piezoelectric element 16 as shown in FIG.

[0065]

As described above, according to the present invention, even if the nozzles are arranged at a high density, the rigidity of each pressure chamber partition can be increased to suppress crosstalk, and therefore, high quality printing can be achieved. It can be carried out.

[Brief description of the drawings]

FIG. 1A is a configuration diagram showing a first embodiment of the present invention,
(B) is an enlarged view of a main part of (a), and (c) is a cross-sectional view taken along line AA of FIG. 1 (b).

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a sectional view showing Embodiment 2 of the present invention.

FIG. 4 is a cross-sectional view showing another embodiment of the present invention.

FIG. 5 is a configuration diagram showing a third embodiment of the present invention.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a configuration diagram showing an inkjet head according to a conventional example.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a cross-sectional view illustrating an operation state when a conventional inkjet head is driven.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle 2 Nozzle communication hole 3 Ink supply port 4 Pressure chamber 5 Piezoelectric element 6 Ink pool 7 Nozzle plate 8 Vibrating plate 9 Pressure chamber partition (pressed part) 10 Supply port plate 11 Pressure chamber partition 14 Pool plate 15 Pressure chamber plate 15a Pressure chamber plate (also forms a pool) 16 Laminated type piezoelectric element 17 Ink supply path 18 Supply path plate

Claims (10)

[Claims] 1. An ink jet head for recording data by applying pressure from a piezoelectric element and a vibration plate to a pressure chamber to which ink is supplied and causing ink to fly from the pressure chamber through a nozzle to record data. An ink jet head characterized in that a part of a pressure chamber partition separating the chambers is thickened to increase rigidity and reduce crosstalk of the pressure chamber partition to the pressure chamber. 2. An ink jet head for recording data by applying pressure from a piezoelectric element and a vibration plate to a pressure chamber to which ink is supplied and causing ink to fly from the pressure chamber through a nozzle to record data. By increasing the thickness of the pressure chamber partition wall separating the pressure chambers on the diaphragm side and the thickness of the nozzle side located on the side opposite to the diaphragm side, increasing the rigidity of the pressure chamber partition wall, An ink jet head characterized in that crosstalk to the pressure chamber by the pressure chamber partition is reduced. 3. An ink jet head for recording data by applying pressure from a piezoelectric element and a vibrating plate to a pressure chamber to which ink is supplied and causing ink to fly from the pressure chamber through a nozzle to record data. An ink pool that supplies ink to the pressure chamber and the pressure chamber are provided at positions that do not overlap with each other to increase the rigidity of the pressure chamber partition wall, and reduce crosstalk between adjacent pressure chambers. 4. An ink-jet head for recording data by applying pressure from a piezoelectric element and a vibration plate to a pressure chamber to which ink is supplied and causing ink to fly from the pressure chamber through a nozzle to record data. A part of the pressure chamber partition separating the chambers is thickened to increase the rigidity, and the thickness of the pressure chamber partition separating the adjacent pressure chambers on the diaphragm side and the side opposite to the diaphragm side. An ink jet head, wherein the rigidity of the pressure chamber partition is increased by making the thickness of the pressure chamber partition different from the thickness of the nozzle side located in the pressure chamber, and crosstalk to the pressure chamber by the pressure chamber partition is reduced. 5. An ink-jet head for recording data by applying pressure from a piezoelectric element and a diaphragm to a pressure chamber to which ink is supplied, and causing ink to fly from the pressure chamber through a nozzle to record data. A part of the pressure chamber partition separating the chambers is thickened to increase rigidity, reduce crosstalk to the pressure chamber by the pressure chamber partition, and further provide an ink pool and the pressure for supplying ink to the pressure chamber. An ink jet head, wherein the pressure chamber partition walls are provided at positions not overlapping with each other to increase the rigidity of the pressure chamber partition walls and reduce crosstalk between adjacent pressure chambers. 6. An ink jet head for recording data by applying pressure from a piezoelectric element and a vibrating plate to a pressure chamber to which ink is supplied and causing ink to fly from the pressure chamber through a nozzle to record data. By increasing the thickness of the pressure chamber partition wall separating the pressure chambers on the diaphragm side and the thickness of the nozzle side located on the side opposite to the diaphragm side, increasing the rigidity of the pressure chamber partition wall, Crosstalk to the pressure chamber by the pressure chamber partition is reduced, and an ink pool that supplies ink to the pressure chamber and the pressure chamber are provided at positions that do not overlap with each other to increase the rigidity of the pressure chamber partition. An ink jet head characterized in that crosstalk between the pressure chambers is reduced. 7. An ink jet head for recording data by applying pressure from a piezoelectric element and a vibration plate to a pressure chamber to which ink is supplied and causing ink to fly from the pressure chamber through a nozzle to record data. A part of the pressure chamber partition separating the chambers is thickened to increase the rigidity, and the thickness of the pressure chamber partition separating the adjacent pressure chambers on the diaphragm side and the side opposite to the diaphragm side. The thickness of the pressure chamber partition wall is increased by increasing the thickness of the pressure chamber partition wall, the crosstalk of the pressure chamber partition wall to the pressure chamber is reduced, and the ink is supplied to the pressure chamber. An ink jet head, wherein a pool and the pressure chamber are provided at positions where they do not overlap with each other to increase the rigidity of the pressure chamber partition walls and reduce crosstalk between adjacent pressure chambers. 8. The rigidity is increased by projecting a part of a side wall of the pressure chamber inward to make a part of the pressure chamber partition wall a thick part. 8. The inkjet head according to 7. 9. The pressure chamber according to claim 1, wherein when the pressure chamber has an elongated shape, the thickness of the pressure chamber is increased near the center in the longitudinal direction to increase the rigidity. Inkjet head. 10. The ink jet head according to claim 2, wherein the thickness of the pressure chamber partition wall is increased in a tapered shape from the vibration plate side to the nozzle side.