CN111038105B - Piezoelectric type ink-jet printing head - Google Patents
Piezoelectric type ink-jet printing head Download PDFInfo
- Publication number
- CN111038105B CN111038105B CN201911317424.XA CN201911317424A CN111038105B CN 111038105 B CN111038105 B CN 111038105B CN 201911317424 A CN201911317424 A CN 201911317424A CN 111038105 B CN111038105 B CN 111038105B
- Authority
- CN
- China
- Prior art keywords
- channel
- ink
- pressure
- nozzle
- communicated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
The invention belongs to the technical field of droplet jet printing, and particularly relates to a piezoelectric ink-jet printing head which solves the problem of poor printing quality caused by insufficient ink supply or uneven ink supply of the traditional piezoelectric ink-jet printing head. The main ink channel is communicated with each pressure cavity by adopting a pressure difference channel, so that a certain hydraulic pressure difference exists between the main ink channel and each pressure cavity, ink is promoted to enter each cavity under the hydraulic action, smoothness and sufficiency of ink supply of each cavity are ensured, and the printing efficiency is effectively improved; and a zigzag current limiter structure is added between the pressure cavity and the main ink channel, so that liquid backflow in the pressure cavity is reduced, pressure loss in the pressure cavity is reduced, the ejection performance of the printing head is improved, and pressure crosstalk between the pressure cavities can be reduced. Meanwhile, a transition channel plate is added between the pressure cavity and the nozzle plate, namely, the strength of the nozzle plate is increased, when the piezoelectric ceramic is driven to deform and the pressure in the pressure cavity is increased, the pressure loss in the pressure cavity caused by the deformation of the nozzle plate is reduced, and the jetting performance of the printing head is improved.
Description
Technical Field
The invention belongs to the technical field of droplet jet printing, and particularly relates to a piezoelectric type ink jet printing head.
Background
The droplet jet printing technology is a printing technology which generates a pressure difference between an ink chamber and the outside in a certain extrusion mode, so that the internal pressure of a nozzle is larger than the outside pressure, and ink is pushed out of the nozzle to generate tiny ink droplets. In general, droplet ejection technology can be divided into continuous and on-demand types, and the on-demand type has wide application because of its simple structure, good droplet consistency, high printing precision, and the like.
The inkjet print head is generally classified into a piezoelectric type inkjet print head and a thermal bubble type inkjet print head according to the ejection manner of ink droplets. The piezoelectric ink jet print head uses the deformation of piezoelectric material to generate force to jet ink drops; a thermal bubble type inkjet printhead ejects ink droplets by expansion of bubbles generated in ink by heating.
When the piezoelectric type ink jet printing head works, pressure in each pressure cavity is required to be uniform and not influenced mutually, ink supply of each pressure cavity is smooth and sufficient, and then printing quality, printing speed, printing frequency and the like are ensured, so that a proper ink flow path is required to be selected.
An ink flow path of a conventional piezoelectric type inkjet printhead is shown in fig. 1, in which a main ink channel 12 is a flow channel through which ink flows into a pressure chamber, a restriction channel 13 for suppressing transmission of pressure waves to other chambers, a pressure chamber 14 for allowing ink to flow into an orifice 15 in the pressure chamber, and the orifice 15 for ejecting ink. Ink flows from the main ink channel 12 through the restrictor channel 13 into the flow channel 14 in the pressure chamber and then into the orifice 15, where it is ejected.
For conventional piezoelectric inkjet print heads, the following drawbacks are mainly present:
1. the problem of insufficient ink supply caused by the phenomenon that the ink of the printing head cannot successfully enter a pressure cavity flow passage through the flow limiting passage exists;
2. when the printing head ejects at high frequency, the pressure cavity at the upstream of the main ink channel near the ink inlet is easy to absorb ink, and the chambers at the downstream of the main ink channel are difficult to absorb ink compared with the chambers at the upstream, so that the phenomenon of insufficient ink supply is easy to occur, and the ink supply is uneven. Especially, when the pressure chambers are arranged more, the phenomenon of insufficient ink supply at the downstream is particularly obvious. For an inkjet printhead, insufficient ink supply can cause inconsistent and even non-ink ejection of ejected droplets, which can seriously affect print quality.
3. When the piezoelectric ceramic is driven to deform and the pressure in the pressure cavity is increased, the nozzle plate is easy to deform, so that the pressure in the pressure cavity is lost, uneven ink jet is caused, and the printing quality is influenced.
Disclosure of Invention
The invention aims to provide a piezoelectric type printing head to solve the problem of poor printing quality caused by insufficient ink supply or uneven ink supply of the traditional piezoelectric type ink jet printing head.
The reasons for the insufficient or uneven ink supply of the traditional piezoelectric ink jet printing head are found through a plurality of experimental analyses and comprise the following two points:
1. the traditional piezoelectric type ink jet printing head has no hydraulic pressure difference between a main ink channel and each pressure cavity, so that the driving force for ink to enter the cavity from the main ink channel is very small, the ink of the printing head cannot successfully enter the cavity through an ink inlet, and the phenomenon of insufficient ink supply occurs;
2. similarly, because there is no hydraulic pressure difference between the main ink channel and each pressure cavity of the traditional piezoelectric ink-jet printing head, the driving force for ink to enter the cavity from the main ink channel is very small, the pressure cavity near the ink inlet on the upstream of the main ink channel is easy to absorb ink, and the chambers on the downstream of the main ink channel are difficult to absorb ink compared with the chambers on the upstream, so that the phenomenon of uneven ink supply occurs;
3. the pressure loss in the pressure chamber is caused by the local pressure loss caused by the large abrupt change from the pressure chamber to the jet orifice of the traditional piezoelectric ink jet printing head; secondly, the nozzle plate is less strong, and the deformation of the nozzle plate can also cause the pressure loss in the pressure chamber.
Therefore, through the analysis, the invention provides the following technical scheme:
a piezoelectric ink jet printing head comprises a main ink channel, n drivers, n pressure cavities and n current-limiting channels, wherein the main ink channel is communicated with each pressure cavity through the current-limiting channels; the driver is positioned at the top of the pressure cavity; wherein n is a positive integer greater than or equal to 1;
it is characterized in that: the inlet end of the pressure difference channel is communicated with the main ink channel, and the outlet end of the pressure difference channel is communicated with each flow-limiting channel; the horizontal height of the ink outlet end of the pressure difference channel is lower than that of the ink inlet end of the main ink channel, so that the ink in the main ink channel and the ink in each flow channel of the pressure cavity have the same hydraulic pressure difference;
the bottom of each pressure cavity is provided with a transition channel plate, and the transition channel plate is provided with a transition channel communicated with each pressure cavity; the bottom of the transition channel plate is provided with a nozzle plate, the nozzle plate is provided with a nozzle communicated with the transition channel, and the inner diameter of the transition channel is larger than that of the nozzle.
Furthermore, in order to ensure the smooth ink supply of the flow channels in each pressure cavity, the pressure difference channel is L-shaped, the horizontal section is communicated with the main ink channel, and the vertical section is communicated with the flow limiting channel.
Furthermore, in order to ensure that the ink supply of the flow channels in each pressure cavity is uniform, n pressure difference channels are uniformly distributed at the bottom of the main ink channel.
Further, in order to reduce the generation of bubbles in the ejection recovery stage, the nozzle is a tapered nozzle.
Further, the taper of the tapered nozzle is 5 to 60 °.
Further, the nozzle may be a funnel-shaped nozzle or a step-decreasing nozzle.
Furthermore, in order to reduce the liquid backflow in the pressure cavity and reduce the pressure loss in the pressure cavity, the flow limiting channel sequentially comprises a first channel, a second channel, a third channel, a fourth channel and a fifth channel which are communicated with each other along the ink flow direction; the first channel, the third channel and the fifth channel are all arranged along the horizontal direction; the second channel, the third channel and the fourth channel form a U-shaped channel, wherein the second channel is arranged along the vertical direction, the fourth channel is obliquely arranged, and an included angle between the fourth channel and the third channel is an obtuse angle.
In order to increase the density of the jet holes of the printing head, the invention also provides a piezoelectric type ink-jet printing head, which is characterized in that: comprises two groups of piezoelectric ink jet printing head units;
the piezoelectric ink jet printing head unit comprises a main ink channel, n drivers, n pressure cavities and n current-limiting channels, wherein the main ink channel is communicated with each pressure cavity through the current-limiting channels; the driver is positioned at the top of the pressure cavity; wherein n is a positive integer greater than or equal to 1;
the inlet end of the pressure difference channel is communicated with the main ink channel, and the outlet end of the pressure difference channel is communicated with each flow-limiting channel; the horizontal height of the ink outlet end of the pressure difference channel is lower than that of the ink inlet end of the main ink channel, so that the ink in the main ink channel and the ink in each flow channel of the pressure cavity have the same hydraulic pressure difference;
the bottom of each pressure cavity is provided with a transition channel plate, and the transition channel plate is provided with a transition channel communicated with each pressure cavity; the bottom of the transition channel plate is provided with a nozzle plate, the nozzle plate is provided with a nozzle communicated with the transition channel, and the inner diameter of the transition channel is larger than that of the nozzle;
the nozzles of the two groups of piezoelectric ink jet printing head units are positioned on the same straight line, and the two groups of piezoelectric ink jet printing head units are symmetrically arranged around the straight line.
Furthermore, the pressure difference channel is L-shaped, the horizontal section is communicated with the main ink channel, and the vertical section is communicated with the flow limiting channel.
Further, the horizontal section of the pressure difference passage communicates with the bottom of the main ink passage.
Further, the nozzle is a tapered nozzle.
Further, the taper of the tapered nozzle is 5 to 60 °.
Further, the nozzle is a funnel-shaped nozzle or a step-decreasing nozzle.
Furthermore, the flow limiting channel sequentially comprises a first channel, a second channel, a third channel, a fourth channel and a fifth channel which are communicated with each other along the ink flow direction; the first channel, the third channel and the fifth channel are all arranged along the horizontal direction; the second channel, the third channel and the fourth channel form a U-shaped channel, wherein the second channel is arranged along the vertical direction, the fourth channel is obliquely arranged, and an included angle between the fourth channel and the third channel is an obtuse angle.
The invention has the beneficial effects that:
1. according to the invention, a certain hydraulic pressure difference exists between the main ink channel and each pressure cavity, so that ink is promoted to enter each cavity under the hydraulic action, the smoothness and sufficiency of ink supply of each cavity are ensured, and the printing efficiency is effectively improved;
2. because the ink is pushed into the chambers by the hydraulic pressure difference between the main ink channel and each pressure chamber, under the condition that the hydraulic pressure differences are the same, the pressure applied to the ink is equal to that applied to each chamber, which is beneficial to ensuring the uniform ink supply of each chamber and improving the printing quality.
3. Increase tortuous current limiter structure between pressure chamber and main ink duct, reduce the interior liquid reflux of pressure chamber, reduce pressure chamber pressure loss, promote and beat printer head ejection performance, can reduce the pressure crosstalk between the pressure chamber simultaneously.
4. A transition channel plate is additionally arranged between the pressure cavity and the nozzle plate, so that the local pressure loss caused by the sudden change of the cross section from the pressure cavity to the jet orifice is reduced, and the jet performance of the printing head is improved.
5. A transition channel plate is added between the pressure cavity and the nozzle plate, namely the strength of the nozzle plate is increased, when the piezoelectric ceramic is driven to deform and the pressure in the pressure cavity is increased, the pressure loss in the pressure cavity caused by the deformation of the nozzle plate is reduced, and the jetting performance of the printing head is improved.
6. The pressure cavities can be uniformly distributed on two sides of the single-row spray holes, and the pressure cavities on the two sides are aligned, so that the density of the spray holes of the printing head can be improved.
7. The spray holes are tapered in an inverted cone shape, a funnel shape or a step shape, so that on one hand, bubbles generated in the spray recovery stage are reduced, and printing interruption is caused, and on the other hand, the tapered spray holes are beneficial to reducing the fluid spray flow resistance.
Drawings
FIG. 1a is a schematic front view of an ink flow path of a conventional piezoelectric ink jet printhead;
FIG. 1b is a cross-sectional view taken along line M-M of FIG. 1 a;
the reference numbers in the figures are: 12-main ink channel, 13-flow-limiting channel, 14-pressure cavity, 15-jet orifice, 16-driver;
FIG. 2 is a schematic front view of a piezoelectric inkjet printhead according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line P-P of FIG. 2;
the reference numbers in the figures are: 112-main ink channel, 113-restriction channel, 114-pressure chamber, 115-transition channel, 116-nozzle, 117-differential pressure channel, 118-transition plate, 119-nozzle plate;
FIG. 4a is a schematic front view of a piezoelectric inkjet printhead according to a second embodiment of the present invention;
FIG. 4b is a cross-sectional view taken along line N-N of FIG. 4 a;
the reference numbers in the figures are: 112-main ink channel, 113-restriction channel, 114-pressure chamber, 115-transition channel, 116-nozzle, 117-differential pressure channel, 118-transition plate, 119-nozzle plate;
FIG. 5a is a schematic view of the ink jetting process in the conical nozzle of the present invention;
FIG. 5b is a schematic diagram illustrating the ejection of ink from a conventional nozzle;
FIG. 6 is an enlarged partial schematic view of a flow restricting passage;
the reference numbers in the figures are: 1131-first channel, 1132-second channel, 1133-third channel, 1134-fourth channel, 1135-fifth channel.
Detailed Description
The invention designs a novel piezoelectric type ink-jet printing head, which mainly relates to an ink flow path, wherein ink is pushed to enter a pressure cavity through the same hydraulic pressure difference between a main ink channel and each pressure cavity, so that the ink supply is smooth, and the sufficiency and the uniformity of the ink in each pressure cavity are ensured. The zigzag current limiter structure can be additionally arranged between the pressure cavity and the main ink channel, liquid backflow in the pressure cavity is reduced, pressure loss in the pressure cavity is reduced, the jetting performance of the printing head is improved, and meanwhile pressure crosstalk between the pressure cavities can be reduced. In addition, the transition channel is additionally arranged between the pressure cavity and the nozzle plate, so that the local pressure loss caused by the sudden change of the cross section from the pressure cavity to the jet hole is reduced, the pressure loss in the pressure cavity caused by the deformation of the nozzle plate is reduced, and the jetting performance of the printing head is improved.
The invention is further described with reference to the following figures and specific embodiments.
Example one
As shown in fig. 2 and 3, the piezoelectric inkjet printhead according to the present embodiment includes a main ink channel 112, a pressure difference channel 117, a flow restriction channel 113, a pressure chamber 114, a transition channel plate 118, a transition channel 115, a nozzle plate 119, and a nozzle 116. Ink flows from the main ink channel 112 through the pressure differential channel 117, the restrictor channel 113 into the pressure chamber 114, through the transition channel 115 into the nozzle 116, and out of the ink jet. In the present embodiment, five pressure difference passages 117, a restriction passage 113, and a pressure chamber 114 are described, but the number is not limited in other embodiments.
The main ink channel 112 is used for providing a flow path for ink to flow into the pressure chambers, and is communicated with each pressure chamber 114 through each pressure difference channel 117 and the flow limiting channel 113, wherein the pressure difference channel 117 is L-shaped, the horizontal sections of the five pressure difference channels are uniformly distributed at the bottom end of the main ink channel 112 and are communicated with the main ink channel 112, the vertical section is connected with the flow limiting channel, and the horizontal height of the ink outlet of the vertical section is lower than that of the ink inlet of the main ink channel, so that the main ink channel 112 and each pressure chamber 114 have certain and same hydraulic pressure difference. In other embodiments, the pressure difference channel 117 may have any shape as long as a certain and same hydraulic pressure difference between the main ink channel 112 and each pressure chamber 114 can be ensured. Compared with the ink flow path of the traditional piezoelectric ink jet printing head, the main ink channel 112 and each pressure cavity 114 of the present embodiment have a certain and same hydraulic pressure difference, so as to ensure that the ink pressure in each pressure cavity is uniform, and the hydraulic pressure difference helps to push the ink to enter the pressure cavity 114 from the main ink channel 112 through the pressure difference channel 117 and the flow limiting channel 113, so as to realize smooth and sufficient ink supply.
The flow-restricting channel 113 is used to suppress the transmission of pressure waves to other chambers, and as can be seen from fig. 6, the central axis of the flow-restricting channel 113 is a broken line, and includes a first channel 1131, a second channel 1132, a third channel 1133, a fourth channel 1134 and a fifth channel 1135 which are communicated with each other in sequence along the flow direction of the ink; the first channel 1131, the third channel 1133, and the fifth channel 1135 are all disposed along the horizontal direction; the second channel 1132, the third channel 1133 and the fourth channel 1134 form a U-like channel, wherein the second channel 1132 is arranged in the vertical direction, the fourth channel 1134 is arranged in an inclined manner, and an included angle between the fourth channel 1134 and the third channel 1133 is an obtuse angle. The ink passes through the zigzag ink channel of the flow limiting channel 113 from the pressure difference channel 117, when the piezoelectric ceramic is driven to deform, the ink backflow resistance is increased, the liquid backflow in the pressure cavity is reduced, the pressure loss in the pressure cavity is reduced, and meanwhile, the zigzag ink channel is favorable for increasing the attenuation of pressure waves and reducing the pressure crosstalk between the pressure cavities.
The transition channel 115, which is used to reduce local pressure losses, is arranged in a transition channel plate 118 at the pressure chamber 114, and the nozzles 116 open in a nozzle plate 119 at the bottom of the transition channel plate, coaxially to the transition channel. As is apparent from FIG. 2, the inner diameter of the transition channel 115 is larger than that of the nozzle 116, so as to reduce the local pressure loss caused by the abrupt change of the cross section from the pressure chamber to the nozzle, and at the same time, the addition of the transition channel plate 118 between the pressure chamber 114 and the nozzle plate 119 is also beneficial to reducing the local pressure loss caused by the abrupt change of the cross section from the pressure chamber to the nozzle hole, and the increase of the transition channel plate 118, namely the increase of the strength of the nozzle plate 119, when the piezoelectric ceramic is driven by deformation and the pressure in the pressure chamber is increased, the pressure loss in the pressure chamber caused by the deformation of the nozzle plate is reduced, and the ejection performance of the printing head is improved.
The nozzle 116 is used for ejecting ink, and the embodiment adopts a tapered nozzle, as can be seen from the comparison between fig. 5a and 5b, on one hand, the tapered nozzle is not easy to generate bubbles in the ejection recovery stage, and the conventional nozzle structure is more easy to generate bubbles, which causes printing interruption; on the other hand, when the outlet diameter is the same, the inlet diameter of the conical spray hole (the taper is 5-60 degrees) is large, the ink flow resistance is small, and the jet is easy to realize. Of course, the funnel-shaped and step-type descending can also play the above role.
Example two
As can be seen from fig. 4a and 4b, the present embodiment includes two sets of symmetrically arranged piezoelectric inkjet print heads according to the first embodiment, nozzles of the two sets of piezoelectric inkjet print heads are located on the same straight line, pressure chambers are uniformly distributed on two sides of the nozzles, and the pressure chambers on two sides are aligned, which is beneficial to increasing the nozzle density of the print head.
It should be noted that, all the ink flow modes that the ink is pushed to uniformly and sufficiently enter the pressure chambers by using the liquid pressure difference between the main ink channel and each pressure chamber, all the ink flow modes that crosstalk is reduced by using the structure of the zigzag current limiter, and all the ink flow modes that local pressure loss is reduced by using the transition channel belong to the patent protection scope.
Claims (10)
1. A piezoelectric type ink jet print head includes a main ink channel (112), n drivers, n pressure chambers (114), n flow limiting channels (113), the main ink channel (112) is communicated with each pressure chamber (114) through the flow limiting channels (113); the driver is positioned at the top of the pressure cavity (114); wherein n is a positive integer greater than or equal to 1;
the method is characterized in that: the ink jet head also comprises n pressure difference channels (117), wherein the inlet end of each pressure difference channel (117) is communicated with the main ink channel (112), and the outlet end of each pressure difference channel (117) is communicated with each flow-limiting channel (113); the level of the ink outlet end of the pressure difference channel (117) is lower than that of the ink inlet end of the main ink channel (112), so that the ink in the main ink channel (112) and the ink in each pressure cavity (114) have the same hydraulic pressure difference;
a transition channel plate (118) is arranged at the bottom of each pressure cavity (114), a transition channel (115) communicated with each pressure cavity (114) is formed in the transition channel plate (118), a nozzle plate (119) is arranged at the bottom of the transition channel plate (118), a nozzle (116) communicated with the transition channel (115) is formed in the nozzle plate (119), and the inner diameter of the transition channel (115) is larger than that of the nozzle (116); the pressure difference channel (117) is L-shaped, the horizontal section is communicated with the main ink channel (112), and the vertical section is communicated with the flow limiting channel (113); the n pressure difference channels (117) are uniformly distributed at the bottom of the main ink channel (112).
2. The piezoelectric inkjet printhead of claim 1, wherein: the nozzle (116) is a conical nozzle.
3. The piezoelectric inkjet printhead of claim 2, wherein: the taper of the conical nozzle is 5-60 degrees.
4. The piezoelectric inkjet printhead of claim 1, wherein: the nozzle (116) is a funnel-shaped nozzle or a step-decreasing nozzle.
5. The piezoelectric inkjet printhead of claim 1, wherein: the flow limiting channel (113) sequentially comprises a first channel (1131), a second channel (1132), a third channel (1133), a fourth channel (1134) and a fifth channel (1135) which are communicated with each other along the ink flow direction; the first channel (1131), the third channel (1133) and the fifth channel (1135) are arranged along the horizontal direction; the second channel (1132), the third channel (1133) and the fourth channel (1134) form a U-shaped channel, wherein the second channel (1132) is arranged along the vertical direction, the fourth channel (1134) is obliquely arranged, and an included angle between the fourth channel and the third channel (1133) is an obtuse angle.
6. A piezoelectric ink jet print head, comprising: comprises two groups of piezoelectric ink jet printing head units;
the piezoelectric type ink jet printing head unit comprises a main ink channel (112), n drivers, n pressure cavities (114) and n flow limiting channels (113), wherein the main ink channel (112) is communicated with each pressure cavity (114) through the flow limiting channel (113); the driver is positioned at the top of the pressure cavity (114); wherein n is a positive integer greater than or equal to 1;
the ink jet head further comprises n pressure difference channels (117), wherein the inlet end of each pressure difference channel (117) is communicated with the main ink channel (112), and the outlet end of each pressure difference channel (117) is communicated with each flow-limiting channel (113); the level of the ink outlet end of the pressure difference channel (117) is lower than that of the ink inlet end of the main ink channel (112), so that the ink in the main ink channel (112) and the ink in each pressure cavity (114) have the same hydraulic pressure difference;
transition channel plates (118) are arranged at the bottoms of the pressure cavities (114), and transition channels (115) communicated with the pressure cavities (114) are formed in the transition channel plates (118); a nozzle plate (119) is arranged at the bottom of the transition channel plate (118), a nozzle (116) communicated with the transition channel (115) is arranged on the nozzle plate (119), and the inner diameter of the transition channel (115) is larger than that of the nozzle (116);
the nozzles of the two groups of piezoelectric ink jet printing head units are positioned on the same straight line, and the two groups of piezoelectric ink jet printing head units are symmetrically arranged around the straight line; the pressure difference channel (117) is L-shaped, the horizontal section is communicated with the main ink channel (112), and the vertical section is communicated with the flow limiting channel (113); the horizontal section of the pressure difference passage (117) communicates with the bottom of the main ink passage (112).
7. The piezoelectric inkjet printhead of claim 6, wherein: the nozzle (116) is a conical nozzle.
8. The piezoelectric inkjet printhead of claim 7, wherein: the taper of the conical nozzle is 5-60 degrees.
9. The piezoelectric inkjet printhead of claim 6, wherein: the nozzle (116) is a funnel-shaped nozzle or a step-decreasing nozzle.
10. The piezoelectric inkjet printhead of claim 8, wherein: the flow limiting channel (113) sequentially comprises a first channel (1131), a second channel (1132), a third channel (1133), a fourth channel (1134) and a fifth channel (1135) which are communicated with each other along the ink flow direction; the first channel (1131), the third channel (1133) and the fifth channel (1135) are arranged along the horizontal direction; the second channel (1132), the third channel (1133) and the fourth channel (1134) form a U-shaped channel, wherein the second channel (1132) is arranged along the vertical direction, the fourth channel (1134) is obliquely arranged, and an included angle between the fourth channel and the third channel (1133) is an obtuse angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911317424.XA CN111038105B (en) | 2019-12-19 | 2019-12-19 | Piezoelectric type ink-jet printing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911317424.XA CN111038105B (en) | 2019-12-19 | 2019-12-19 | Piezoelectric type ink-jet printing head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111038105A CN111038105A (en) | 2020-04-21 |
| CN111038105B true CN111038105B (en) | 2021-09-07 |
Family
ID=70237832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911317424.XA Active CN111038105B (en) | 2019-12-19 | 2019-12-19 | Piezoelectric type ink-jet printing head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111038105B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113665245B (en) * | 2020-05-14 | 2022-10-28 | 上海傲睿科技有限公司 | Liquid injection device and packaging structure |
| CN111716708A (en) * | 2020-08-04 | 2020-09-29 | 佘峰 | Efficient 3D printing device |
| CN114228341B (en) * | 2021-12-16 | 2023-04-14 | 山东中康国创先进印染技术研究院有限公司 | Piezoelectric ink jet head and ink jet printing equipment |
| CN114603993B (en) * | 2022-03-18 | 2023-06-13 | 杭州爱新凯科技有限公司 | Positive pressure printing device of piezoelectric spray head |
| CN114889327B (en) * | 2022-04-21 | 2023-05-12 | 杭州电子科技大学 | Electrostatic inkjet printer nozzle and preparation method thereof |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100438836B1 (en) * | 2001-12-18 | 2004-07-05 | 삼성전자주식회사 | Piezo-electric type inkjet printhead and manufacturing method threrof |
| KR100738117B1 (en) * | 2006-07-06 | 2007-07-12 | 삼성전자주식회사 | Piezoelectric inkjet printhead |
| KR100798371B1 (en) * | 2006-09-27 | 2008-01-28 | 삼성전기주식회사 | Ink-jet head |
| KR101305718B1 (en) * | 2007-01-17 | 2013-09-09 | 엘지전자 주식회사 | High density ink jet printer head |
| KR101101623B1 (en) * | 2009-10-29 | 2012-01-02 | 삼성전기주식회사 | Inkjet print head |
| KR101187991B1 (en) * | 2010-02-23 | 2012-10-04 | 삼성전기주식회사 | Inkjet print head and method for manufacturing inkjet print head |
| KR101975928B1 (en) * | 2011-09-08 | 2019-05-09 | 삼성전자주식회사 | Printing device |
| KR101275471B1 (en) * | 2011-11-30 | 2013-06-17 | 삼성전기주식회사 | inkjet print head |
| JP6364984B2 (en) * | 2014-06-10 | 2018-08-01 | セイコーエプソン株式会社 | Liquid ejecting head and liquid ejecting apparatus |
| CN108749329B (en) * | 2018-06-15 | 2019-07-09 | 大连瑞林数字印刷技术有限公司 | A kind of piezoelectric ink jet printing head structure for preventing ink from flowing back |
| CN109130509B (en) * | 2018-09-30 | 2024-01-09 | 西安增材制造国家研究院有限公司 | Restrictor in a droplet ejection printhead |
-
2019
- 2019-12-19 CN CN201911317424.XA patent/CN111038105B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111038105A (en) | 2020-04-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111038105B (en) | Piezoelectric type ink-jet printing head | |
| CN1134345C (en) | Method and apparatus for ink chamber evacuation | |
| KR101033074B1 (en) | Liquid ejecting head | |
| US8177329B2 (en) | Ink jet print head | |
| KR20030084654A (en) | Ink jet recording head | |
| EP3508345B1 (en) | Ink jet head and ink jet recording apparatus | |
| JP2012030582A (en) | Liquid droplet discharging head | |
| US4420764A (en) | Ink jet printer head | |
| US7824009B2 (en) | Liquid ejection head | |
| CN109130509B (en) | Restrictor in a droplet ejection printhead | |
| JP2011025516A (en) | Inkjet recording head | |
| JP5213569B2 (en) | Inkjet recording head | |
| JP5555767B2 (en) | Print head for producing ink droplets with reduced tail | |
| JP4935169B2 (en) | Image forming apparatus | |
| CN209141700U (en) | A kind of current limiter in droplet ejection print head | |
| JP2018039135A (en) | Inkjet head and inkjet recording device | |
| JP6686814B2 (en) | INKJET HEAD, INKJET RECORDING DEVICE, AND INKJET HEAD MANUFACTURING METHOD | |
| JP5762104B2 (en) | Inkjet recording head substrate, inkjet recording head, and inkjet recording apparatus | |
| US7524035B2 (en) | Fluid ejection device | |
| US6588878B2 (en) | Jet and method thereof for ejecting droplets of different sizes | |
| US20240059065A1 (en) | Liquid ejection head | |
| JP2637957B2 (en) | Ink jet head | |
| JP2002273870A (en) | Ink jet printing head | |
| JP2008087445A (en) | Inkjet recording head | |
| US20220250382A1 (en) | Liquid Discharging Head |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |