WO2022086546A1 - Configuration asymétrique de groupes d'éléments d'éjection de fluide, d'orifices et de canaux de tête d'impression - Google Patents

Configuration asymétrique de groupes d'éléments d'éjection de fluide, d'orifices et de canaux de tête d'impression Download PDF

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Publication number
WO2022086546A1
WO2022086546A1 PCT/US2020/056998 US2020056998W WO2022086546A1 WO 2022086546 A1 WO2022086546 A1 WO 2022086546A1 US 2020056998 W US2020056998 W US 2020056998W WO 2022086546 A1 WO2022086546 A1 WO 2022086546A1
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WO
WIPO (PCT)
Prior art keywords
fluid
ejection
channels
supply
printhead
Prior art date
Application number
PCT/US2020/056998
Other languages
English (en)
Inventor
Garrett E. Clark
Si-Lam Choy
Eric Thomas MARTIN
Jacob LUM
James R. Przybyla
Original Assignee
Hewlett-Packard Development Company, L.P.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hewlett-Packard Development Company, L.P. filed Critical Hewlett-Packard Development Company, L.P.
Priority to PCT/US2020/056998 priority Critical patent/WO2022086546A1/fr
Publication of WO2022086546A1 publication Critical patent/WO2022086546A1/fr

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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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems
    • 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
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/14032—Structure of the pressure chamber
    • B41J2/1404—Geometrical characteristics
    • 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
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/14145—Structure of the manifold
    • 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
    • B41J2/145—Arrangement thereof
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head

Definitions

  • Printing devices including industrial printing devices that are commonly referred to as presses as well as office- and home-oriented printing devices that include standalone printers and as all-in-one (AIO) printing devices which combine printing functionality with other functionality like scanning and copying, can use a variety of different printing techniques.
  • One type of printing technology is inkjet printing technology, which is more generally a type of fluid-ejection technology.
  • a fluid-ejection device such as a printhead (i.e. , a printhead die) or a printing device having such a printhead, includes a number of fluid-ejection elements with respective nozzles. Firing a fluid-ejection element causes the element to eject fluid, such as a drop thereof, from its nozzle.
  • FIG. 1 A is a top-view diagram of an example fluid-ejection cartridge including a fluid-ejection printhead having one fluid type and dual fluid recirculation paths.
  • FIGs. 1 B and 1 C are cross-sectional front view diagrams of the cartridge.
  • FIGs. 1 D, 1 E, and 1 F are cross-sectional side view diagrams of the cartridge.
  • FIGs. 2A and 2B are cross-sectional front view diagrams of an example fluid-ejection cartridge including a fluid-ejection printhead having two fluid types and singular fluid recirculation paths.
  • FIG. 2C is a cross-sectional top-view diagram of the cartridge.
  • FIG. 3 is a top-view diagram of a fluid-ejection printhead having two fluid types and dual fluid recirculation paths.
  • FIG. 4 is a block diagram of an example fluid-ejection device.
  • a fluid-ejection printhead (i.e. , a printhead die) includes a number of fluid-ejection elements with respective nozzles from which the elements eject fluid, such as by energizing firing resistors of the elements.
  • the density or number of fluid-ejection elements on a given printhead may be particularly great.
  • the rate at which the elements are fired may be particularly high.
  • the power requirements of the firing resistors may likewise be particularly high. The net effect of these and other factors is the generation of unwanted heat within a printhead, resulting in the printhead having to be cooled so as not to affect image formation quality or cause premature printhead failure.
  • Printing technology advancement has also resulted in printheads being used with more challenging types of fluid, such as printing fluid including ink.
  • Fluids with greater volatility which is the propensity of the carrier liquid of a fluid to evaporate, leaving being its solid particles, are increasingly used.
  • Fluids that are higher in solid weight percentage which is the percentage by weight of the solids contained within a fluid, are also used more often.
  • Such fluids are more likely to form viscous plugs at the nozzles of fluid-ejection elements.
  • a plug forms when fluid sufficiently dries out at the nozzle, leaving behind a greater mass of solids that clog the nozzle in the form of a plug.
  • Clogged nozzles can deleteriously affect image quality, by impeding or preventing fluid ejection through the nozzles, and/or by affecting the amount or trajectory of fluid ejected through the nozzles.
  • a printhead may have backside channels that permit fluid to recirculate at the backside of the fluid-ejection elements.
  • the constantly recirculating fluid absorbs and removes heat generated within the printhead, such as by the firing resistors of the fluidejection elements.
  • the same fluid ejected from the printhead can thus provide liquid-cooling functionality.
  • the fluid-ejection elements of a printhead may permit fluid to be recirculated through them.
  • fluid recirculation may occur through a fluid-ejection element’s chamber, which contains the fluid that is ejectable through the element’s nozzle via firing resistor energization.
  • Such fluid recirculation reduces the likelihood of plug formation by constantly replenishing the fluid located relatively close to the nozzle of a fluid-ejection element, inhibiting the fluid from drying out at the nozzle.
  • Printhead architectures that permit fluid recirculation can have competing design constraints, however. Sparse nozzles (i.e., increasing the space between adjacent nozzles) can provide for improved fluid-ejection aerodynamic performance. A narrow overall nozzle stance (i.e., the overall distance between the farthest nozzles) can by comparison minimize printhead areal size and/or increase the available space for element control and monitoring circuitry. Widely spacing inlet and outlet ports that flu idical ly connect the backside channels to underlying fluid slots simplify fluid-ejection cartridge assembly, in which the printhead is adhesively attached a cartridge body including the fluid slots.
  • existing printhead architectures that permit fluid recirculation make it more difficult to satisfy these competing design constraints.
  • Existing printhead architectures may symmetrically configure fluid-ejection elements relative to the inlet and outlet ports along the backside channels, for instance.
  • existing architectures for printheads having multiple fluid-ejection element groups and corresponding inlet and outlet ports and backside channels for different fluid types may symmetrically configure each group and its corresponding ports and channels relative to each other group and corresponding ports and channels.
  • the different fluid-ejection element groups may correspond to different colors of ink, for instance.
  • a printhead may have first and second fluidejection element groups. There are first inlet and outlet ports and first backside channels for the first group, and second inlet and outlet ports and second backside channels for the second group.
  • the first fluid-ejection element group, ports, and channels are asymmetrically configured relative to the second fluid-ejection element group, ports, and channels, making it easier to satisfy competing design constraints for printhead architectures that permit fluid recirculation.
  • FIG. 1 A shows the top-view of an example fluid-ejection cartridge 150 including a fluid-ejection printhead 100 attached to a cartridge body 160.
  • the cartridge 150 may or may not include the fluid that the printhead 100 ejects.
  • the cartridge 150 may also be referred to as a module used in industrial printing presses.
  • the cartridge body 160 defines a fluidic supply slot 102S, a fluidic bypass slot 102B, and a fluidic return slot 102R.
  • the slots 102S, 102B, and 102R are collectively referred to as the fluid slots 102.
  • two of the fluid slots 102 may be the same slot; specifically, the slot 102B may be coincident with the slot 102S or 102R.
  • the printhead 100 includes a backside supply channel 106S and a backside return channel 106R, which are collectively referred to as the backside channels 106, and which are disposed over the slots 102.
  • the supply channel 106S is fluidically connected to the supply slot 102S via an inlet port 104S and to the bypass slot 102B via a bypass port 104B. (In an implementation in which the bypass slot 102B is coincident with the slot 102S or 102R, the bypass port 104B is fluidically connected to the slot 102S or 102R.)
  • the return channel 106R is fluidically connected to the return slot 102R via an outlet port 104R.
  • the inlet port 104S, the bypass port 104B, and the outlet port 104R are collectively referred to as the ports 104. While the printhead 100 is depicted as including one inlet port 104S, one bypass port 104B, and one outlet port 104R, in another implementation the printhead 100 may include more than one of each port 104. Similarly, while the printhead 100 is depicted as including one supply channel 106S and one return channel 106R, in another implementation the printhead 100 may include multiple backside channels 106S and multiple return channels 106R. [0015] The printhead 100 also includes fluid-ejection elements 108 that are disposed over the channels 106.
  • the fluid-ejection elements 108 have respective nozzles 110 through which fluid is ejected from the elements 108 when the elements 108 are fired.
  • Each fluid-ejection element 108 spans and is fluidically connected between the supply channel 106S and the return channel 106R, such as via corresponding inlet and outlet feed holes.
  • printhead 100 is depicted as including five fluid-ejection elements 108, in actual implementation the printhead 100 may likely include more than five elements 108 spanning the pair of channels 106.
  • the fluid-ejection printhead 100 has a fluid bypass recirculation path through which fluid recirculates through the supply channel 106S from the supply slot 102S to the bypass slot 102B.
  • the fluid bypass recirculation path is defined by fluid flow in the direction of arrows 114B, 114C, and 114D, which are collectively referred to as the arrows 114.
  • Fluid flow out of the plane of FIG. 1 A is indicated as an arrow point (i.e. , a circled point); fluid flow into the plane of FIG. 1A is indicated an arrow tail (i.e., a circled X or crosshatch).
  • the fluid bypass recirculation path may begin with fluid entering the supply channel 106S from the supply slot 102S via the inlet port 104S per the point of arrow 114B. The fluid then flows through the supply channel 106S in the direction of arrow 114C. The fluid exits the supply channel 106S into the bypass slot 102B via the bypass port 104B per the tail of arrow 114D, completing the fluid bypass recirculation path.
  • the fluid-ejection printhead 100 also has a fluid recirculation path through which fluid recirculates through the fluid-ejection elements 108 from the supply slot 102S to the return slot 102R.
  • This fluid recirculation path is defined by fluid flow in the direction of arrows 116B, 116C, 116D, 116E, 116F, and 116G.
  • This fluid recirculation path is coincident with the fluid bypass recirculation path at first; arrow 116B is coincident with arrow 114B.
  • the fluid recirculation path may begin with fluid entering the supply channel 106S from the supply slot 102S via the inlet port 104S per the point of arrow 116B.
  • the fluid enters the fluid-ejection elements 108 from the supply channel 106S per the points of arrows 116C.
  • the fluid flows through the elements 108 past their nozzles 110 per arrow 116D, before exiting into the return channel 106R per the tails of arrows 116E.
  • the fluid then flows through the return channel 106R in the direction of arrow 116F.
  • the fluid exits the return channel 106R into the return slot 102R via the outlet port 104R per the tail of arrow 116G, completing the fluid recirculation path.
  • FIGs. 1 B and 1 C show different cross-sectional front views of the fluid-ejection cartridge 150 at cross-sectional lines 118B and 118C in FIG. 1A, respectively.
  • FIG. 1 B depicts the fluid bypass recirculation path and a portion of the other fluid recirculation path
  • FIG. 1 C depicts the remainder of the latter fluid recirculation path.
  • the cartridge body 160 of the cartridge 150 defines and thus includes the fluid slots 102S, 102R, and 102B.
  • the fluid-ejection printhead 100 of the cartridge 150 includes an interposer layer 1121, a channel layer 112C, and a fluid-ejection element layer 112E.
  • the interposer layer 1121 includes the inlet port 104S and the bypass port 104B per FIG. 1 B, and the outlet port 104R per FIG. 1 C.
  • the channel layer 112C includes the supply channel 106S per FIG. 1 B, and the return channel 106R per FIG. 1 C.
  • the fluid-ejection element layer 112E includes the fluid-ejection elements 108 with their respective nozzles 110.
  • fluid flows from the supply slot 102S through the inlet port 104S to the supply channel 106S per the arrow 114B.
  • the fluid then flows through the supply channel 106S per the arrow 114C.
  • the fluid finally flows through the bypass port 104B into the bypass slot 102B per the arrow 114D, completing the fluid bypass recirculation path.
  • the other fluid recirculation path may begin with fluid entering the supply channel 106S through the inlet port 104S per the arrow 116B.
  • the fluid flows into the fluid-ejection elements 108 per the arrows 116C, and then past their nozzles 110 per the tails of arrows 116D in FIG. 1 B and the points of arrows 116D in FIG. 1 C.
  • the fluid recirculation path continues with the fluid flowing into the return channel 106R from the fluid-ejection elements 108 per the arrows 116E.
  • the fluid flows through the return channel 106R per the arrow 116F before flowing into the return slot 102R through the outlet port 104R per the arrow 116G, completing the fluid recirculation path.
  • FIGs. 1 D, 1 E, and 1 F show different cross-sectional side views of the fluid-ejection printhead 100 and the cartridge body 160 of the fluidejection cartridge 150 at cross-sectional lines 118D, 118E, and 118F in FIG.
  • FIG. 1 D depicts a portion of each of the fluid bypass and the other fluid recirculation paths.
  • FIG. 1 E depicts the remainder of the fluid bypass recirculation path, whereas FIG. 1 F depicts the remainder of the other fluid recirculation path.
  • the interposer layer 1121, the channel layer 112C, and the fluid-ejection element layer 112E are shown in FIGs. 1 D, 1 E, and 1 F.
  • fluid flows from the supply slot 102S through the inlet port 104S to the supply channel 106S per the arrow 114B.
  • the fluid then flows through the supply channel 106S per the tail of arrow 114C in FIG. 1 D and the point of arrow 114C in FIG. 1 E.
  • the fluid exits the supply channel 106S through the bypass outlet 104B into the bypass slot 102B per the arrow 114D, completing the fluid bypass recirculation path.
  • fluid flows from the supply slot 102S through the inlet port 104S to the supply channel 106S per the arrow 116B.
  • the fluid flows into the fluid-ejection elements 108 per the arrow 116C, and then past their nozzles 110 per the arrow 116D in FIGs. 1 D and 1 F.
  • the fluid flows into the return channel 106R from the fluid-ejection elements 108 per the arrow 116E in FIGs. 1 D and 1 F, before flowing through the return channel 106R per the tail of arrow 116F in FIG. 1 D and the point of arrow 116F in FIG. 1 F.
  • the fluid then flows into the return slot 102R through the outlet port 104R per the arrow 116G, completing the fluid recirculation path.
  • the fluid-ejection printhead 100 has an asymmetrical configuration in FIGs. 1A-1 F, as is best seen in FIGs. 1A-1 C.
  • the fluid-ejection elements 108 with respective nozzles 110 are asymmetrically positioned relative to the inlet, outlet, and bypass ports 104S, 104R, and 104B along the supply and return channels 106S and 106R.
  • the elements 108 are positioned at a far end of the channels 106.
  • the fluid-ejection elements 108 are positioned over the inlet port 104S along the channels 106.
  • the stance of the fluid-ejection elements 108 of the fluid-ejection printhead 100 in the example of FIGs. 1A-1 F is further less than the spacing of the outermost ports 104S and 104B, as is also best seen in FIGs. 1 A-1 C.
  • the stance of the elements 108 with respective nozzles 110 is the distance between the outermost elements 108 in FIGs. 1A-1 C.
  • the spacing of the outermost ports 104S and 104B is the distance between the centers of the ports 104S and 104B. In another implementation, however, the stance of the elements 108 may be greater than the spacing of the outermost ports 104S and 104B.
  • the fluid-ejection printhead 100 in the example of FIGs. 1A-1 F has dual recirculation paths, due to the presence of the bypass port 104B in addition to the outlet port 104R.
  • the printhead 100 may have just one recirculation path, in which case the bypass port 104B is absent. In this case, the singular recirculation path is through the fluid-ejection elements 108.
  • the printhead 100 is able to eject fluid of one fluid type, such as one color of ink. This is because every fluid-ejection element 108 is fluidically connected to the same (singular) fluid supply channel 106S and the same (singular) fluid return channel 106R.
  • FIGs. 2A and 2B show cross-sectional front view diagrams of an example fluid-ejection cartridge 250 that is able to eject fluid of two different types with corresponding singular fluid recirculation paths.
  • the cartridge 250 includes a fluid-ejection printhead 200 attached to a cartridge body 260.
  • FIG. 2C shows a cross-sectional top-view diagram of the cartridge 250 at the cross-sectional line 251 of FIGs. 2A and 2B. Just the printhead 200 is visible in the top view of FIG. 2C.
  • the cross-sectional front views of FIGs. 2A and 2B are respectively at the cross-sectional lines 252A and 252B of FIG. 2C.
  • the cartridge body 260 defines fluidic supply slots 202S-1 and 202S-2, which are collectively referred to as the supply slots 202S.
  • the supply slots 202S are flu idical ly isolated from each other within the example cartridge body 260, but in another implementation may be flu idical ly connected to one another within the body 260.
  • the cartridge body 260 further defines fluidic return slots 202R-1 and 202R-2, which are collectively referred to as the return slots 202R.
  • the return slots 202R are fluidically isolated from each other within the example cartridge body 260, but may instead be fluidically connected to one another within the body 260.
  • the supply slots 202S and the return slots 202R are collectively referred to as the slots 202.
  • the fluid-ejection printhead 200 includes an interposer layer 2121, a channel layer 212C, and a fluid-ejection element layer 212E.
  • the interposer layer 2121 includes inlet ports 204S-1 and 204S-2, which are fluidically isolated from one another within the printhead 200 and which are collectively referred to as the inlet ports 204S.
  • the interposer layer 2121 also includes outlet ports 204R-1 and 204R-2, which are collectively referred to as the outlet ports 204R and which are flu idical ly isolated from one another within the printhead 100.
  • the inlet ports 204S and the outlet ports 204R are collectively referred to as the ports 204.
  • the channel layer 212C includes supply channels 206S-1 and 206S-2, which are collectively referred to as the supply channels 206S and which are fluidically isolated from one another within the printhead 100.
  • the supply channels 206S are fluidically connected to respective supply slots 202S via respective inlet ports 204S.
  • the channel layer 212C includes return channels 206R-1 and 206R-2, which are collectively referred to as the return channels 206R and which are similarly fluidically isolated from one another within the printhead 200.
  • the return channels 206R are fluidically connected to respective return slots 202R via respective outlet ports 204R.
  • the supply channels 206S and the return channels 206R are collectively referred to as the channels 206. (The cross-sectional lines 252A and 252B can be considered channel axes.)
  • the fluid-ejection element layer 112E includes fluid-ejection element groups 207-1 and 207-2.
  • the group 207-1 includes fluid-ejection elements 208-1 with respective nozzles 210-1 through which fluid is ejected from the elements 208-1 when the elements 208-1 are fired.
  • the group 207-2 similarly includes fluid-ejection elements 208-2 with respective nozzles 210-2 through which fluid is ejected from the elements 208-2 when the elements 208-2 are fired.
  • the fluid-ejection elements 208-1 are fluidically isolated from the fluid-ejection elements 208-2 within the printhead 100. That is, the fluidejection element group 207-1 is fluidically isolated from the fluid-ejection element group 207-2 within the printhead 100.
  • the fluid-ejection elements 208-1 and 208-2 are collectively referred to as the fluid-ejection elements 208, and the nozzles 210-1 and 210- 2 are collectively referred to as the nozzles 210. (Although the nozzles 210 are not actually visible in the cross-sectional top view of FIG. 2C, their locations are nevertheless shown in the figure.)
  • Each fluid-ejection element 208 spans and is fluidically connected between a respective supply channel 206S and a respective return channel 206R. While the printhead 200 is depicted as including six fluid-ejection elements 208 in each fluid-ejection element group 207, in actual implementation the printhead 100 may likely include more than six elements 208 in each group 207. Furthermore, the number of fluid-ejection elements 208-1 in the group 207-1 may differ from the number of fluid-ejection elements 208-2.
  • the printhead 200 is thus able to eject fluid of two different fluid types, such as two colors of ink.
  • the fluid-ejection elements 208- 1 of the group 207-1 may eject one type of fluid, such as one color of ink
  • the fluid-ejection elements 208-2 of the group 207-2 may eject another type of fluid, such as a different color of ink.
  • the fluid-ejection elements 208 of each group 207 are organized in a chevron configuration in the example printhead 200.
  • the elements 208 of each group 207 may be organized in a different configuration, such as a linear configuration.
  • each fluid-ejection element group 207 there is a singular fluid recirculation path for each fluid-ejection element group 207. Specifically, for each group 207 there is a fluid recirculation path beginning from a respective supply slot 202S through a respective inlet port 204S to a respective supply channel 206S. The fluid recirculation path continues across respective fluid-ejection elements 208 to a respective return channel 206R, before culminating through a respective outlet port 204R to a respective return slot 202R. The fluid recirculation paths thus span respective supply and return channels 206S and 206R. In another implementation, there may also be a fluid bypass recirculation path for each group 207, as is described in more detail later in the detailed description.
  • the fluid-ejection printhead 200 has an asymmetrical configuration, both within or among each fluid-ejection element group 207 and its respective ports 204 and channels 206, and between the groups 207 and their respective ports 204 and channels 206.
  • the group 207-1 of fluid-ejection elements 208-1 is asymmetrically positioned relative to the inlet and outlet ports 204S-1 and 204R-1 along the supply and return channels 206S-1 and 206R-1 .
  • the inlet port 204S-1 is positioned outwards of the fluid-ejection element group 207-1 along the supply channel 206S-1
  • the outlet port 204R-1 is positioned below the innermost fluid-ejection elements 208-1 of the group 207-1 along the return channel 206R-1 .
  • the group 207-2 of fluid-ejection elements 208-2 is also asymmetrically positioned relative to the inlet and outlet ports 204S-2 and 204R-2 along the supply and return channels 206S-2 and 206R-2. Specifically, the innermost fluid-ejection elements 208-2 of the group 207-2 are positioned inwards and above the inlet port 204S-2 along the supply channel 206S-2. The outlet port 204R-2 is positioned outwards of the fluidejection element group 207-2 along the return channel 206R-2.
  • the group 207-1 , the ports 204S-1 and 204R-1 , and the channels 206S-1 and 206R-1 are asymmetrically configured relative to the group 207-2, the ports 204S-2 and 204R-2, and the channels 206S-2 and 206R-2. That is, the (asymmetric) positioning of the group 207-1 relative to the ports 204S-1 and 204R-1 along the channels 206S-1 and 206R-1 is different than the (asymmetric) positioning of the group 207-2 relative to the ports 204S-2 and 204R-2 along the channels 206S-2 and 206R-2. It may thus be said that there is both intergroup 207 asymmetry and intra-group 207 asymmetry.
  • the stance of the fluid-ejection elements 208 of each fluidejection element group 207 of the printhead 200 in the example of FIGs. 2A- 2C is further less than the spacing of their respective ports 204S and 204R.
  • the stance of the fluid-ejection elements 208-1 with respective nozzles 210-1 is the distance between the outermost elements 208-1
  • the stance of the fluid-ejection elements 208-2 with respective nozzles 210-2 is likewise the distance between the outermost elements 208-2.
  • the spacing of the ports 204S-1 and 204R-1 is the distance between their centers
  • the spacing of the ports 204S-2 and 204R-2 is likewise the distance between their centers.
  • the stance of the elements 208 of each group 207 may be greater than the spacing of their respective ports 204S and 204R.
  • each group 207 minimizes printhead areal size and/or increases the available space for element control and monitoring circuitry on the fluid-ejection printhead 200.
  • the wider spacing between each inlet port 204S and its respective outlet port 204R simplifies assembly of the fluidejection cartridge 250 when adhesively attaching the printhead 200 to the cartridge body 260. This is because the port spacing increases the available space onto which to dispense adhesive between each inlet port 204S and its respective outlet port 204R, decreasing needed precision during adhesive dispensation, both with respect to where the adhesive is dispensed and how much adhesive is dispensed.
  • the fluid-ejection printhead 200 further includes an electrical interconnect 214 at the fluid-ejection layer 212E.
  • the interconnect 214 is partially positioned above the return channel 206R-2.
  • the fluid-ejection element group 207-2 does not interfere with placement of the interconnect 214 at the fluid-ejection layer 212E, because the fluid-ejection elements 208-2 of this group 207-2 are asymmetrically positioned along the return channel 206R-2, towards the opposite end of the channel 206R-2.
  • FIG. 3 shows a cross-sectional front view diagram of the example fluid-ejection cartridge 250 in an implementation in which the cartridge 250 is able to eject fluid of two different types but with corresponding dual fluid recirculation paths.
  • the cartridge 250 of FIG. 3 thus differs from that of FIGs. 2A-2C, which is able to eject fluid of two different types with corresponding singular fluid recirculation paths.
  • the cartridge 250 of FIG. 3 otherwise corresponds to that of FIGs. 2A-2C, with the cross-sectional top view of FIG. 3 specifically corresponding to the cross-sectional top view of
  • FIG. 2C In addition to the inlet ports 204S fluidically connected to respective supply channels 206S of the channel layer 212C of the fluidejection printhead 200, and in addition to the outlet ports 204R fluidically connected to respective return channels 206R of the channel layer 212C, there are bypass ports 204B-1 and 204B-2 in FIG. 3.
  • the bypass ports 204B- 1 and 204B-2 are collectively referred to as the bypass ports 204B.
  • Each bypass port 204B is fluidically connected to a respective supply channel 206S, with the port 204B-1 fluidically connected to the channel 206S-1 and the port 204B-2 fluidically connected to the channel 206S-2.
  • bypass ports 204B may be configured differently than is shown in FIG. 3.
  • one or both bypass ports 204B may be fluidically connected to a return channel 206R.
  • the bypass ports 204B may be aligned with respective return and/or supply channels 206S and 206R vertically with respect to the plane of FIG. 3, in which instance the lengths of supply channels 206S are longer and may be equal to the lengths of the return channels 206R.
  • each fluid bypass recirculation path for each group 207 in addition to the fluid recirculation path for each fluid-ejection element group 207 that has been described in relation to FIGs. 2A-2C, there is a fluid bypass recirculation path for each group 207. Specifically, for each group 207 there is a fluid bypass recirculation path through a respective inlet port 204S to a respective supply channel 206S, and then through a respective bypass port 204B. The fluid bypass recirculation paths are thus along respective supply channels 206S.
  • the nozzles 210-1 (of respective fluidejection elements 208-1 of the group 207-1) are asymmetrically positioned relative to the bypass port 204B-1 along the supply channel 206S-1 .
  • FIG. 4 shows a block diagram of an example fluid-ejection device 400.
  • the device 400 includes fluid-ejection control hardware 402 that controls and/or monitors fluid ejection and by the device 400.
  • the hardware 402 may include controllers implemented as integrated circuits (ICs) like application-specific ICs (ASICs), for instance.
  • the fluid-ejection device 400 includes a fluid-ejection cartridge 250 electrically connected to the hardware 402 and having a cartridge body 260 with first and second fluid slots 202, as well as a fluid-ejection printhead 200 attached to the body 260.
  • the fluid-ejection printhead includes a channel layer 212C, an interposer layer 2121, and a fluid-ejection layer 212E.
  • the channel layer 212C has first and second supply channels 206S and first and second return channels 206R.
  • the interposer layer 2121 is below the channel layer 212C and defines defining first and second inlet ports 204S and first and second outlet ports 204R.
  • the first inlet and outlet ports 204S and 204R fluid ically connect the first fluid slots 202 to the first supply and return channels 206S and 206R, respectively.
  • the second inlet and outlet ports 204S and 204R fluidically connect the second fluid slots 202 to the second supply and return channels 206S and 206R, respectively.
  • the fluid-ejection layer 212E is above the channel layer 212C and includes first and second fluid-ejection element groups 207.
  • the first and second fluid-ejection element groups 208 are fluidically connected to the first supply and return channels 206S and 206R and to the second supply and return channels 206S and 206R, respectively.
  • the first fluid-ejection element group 207, ports 204S and 204R, and channels 206S and 206R are asymmetrically configured relative to the second fluid-ejection element group 207, ports 204S and 204R, and channels 206S and 206R.
  • Asymmetrically configured printhead architectures have been described herein. Such asymmetrical configurations can better satisfy the competing design constraints of printhead architectures that permit fluid recirculation.
  • the described asymmetric printhead architecture configurations can, for instance, provide for narrow overall nozzle stance while still providing for widely spaced inlet and outlet ports. Therefore, available space for fluidejection element control and monitoring circuitry may be increased, while also simplifying fluid-ejection cartridge assembly.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)

Abstract

Une tête d'impression à éjection de fluide comprend des couches de canal, d'interposition et d'éjection de fluide. La couche de canal comporte des premier et second canaux d'alimentation et des premier et second canaux de retour. La couche d'interposition délimite des premier et second orifices d'entrée respectivement en communication fluidique avec les premier et second canaux d'alimentation, et des premier et second orifices de sortie respectivement en communication fluidique avec les premier et second canaux de retour. La couche d'éjection de fluide comprend des premier et second groupes d'éléments d'éjection de fluide en communication fluidique avec les premiers canaux d'alimentation et de retour et les seconds canaux d'alimentation et de retour, respectivement. Les premiers groupe d'éléments d'éjection de fluide, orifices et canaux sont conçus de façon asymétrique par rapport aux seconds groupe d'éléments d'éjection de fluide, orifices et canaux.
PCT/US2020/056998 2020-10-23 2020-10-23 Configuration asymétrique de groupes d'éléments d'éjection de fluide, d'orifices et de canaux de tête d'impression WO2022086546A1 (fr)

Priority Applications (1)

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PCT/US2020/056998 WO2022086546A1 (fr) 2020-10-23 2020-10-23 Configuration asymétrique de groupes d'éléments d'éjection de fluide, d'orifices et de canaux de tête d'impression

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PCT/US2020/056998 WO2022086546A1 (fr) 2020-10-23 2020-10-23 Configuration asymétrique de groupes d'éléments d'éjection de fluide, d'orifices et de canaux de tête d'impression

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120056940A1 (en) * 2009-02-06 2012-03-08 Canon Kabushiki Kaisha Liquid ejection head and ink jet printing apparatus
US20140184702A1 (en) * 2012-12-27 2014-07-03 Canon Kabushiki Kaisha Substrate for inkjet print head, inkjet print head, method for manufacturing inkjet print head, and inkjet printing apparatus
US9211721B2 (en) * 2011-09-28 2015-12-15 Hewlett-Packard Development Company, L.P. Slot-to-slot circulation in a fluid ejection device
US20200238699A1 (en) * 2017-09-20 2020-07-30 Hewlett-Packard Development Company, L.P. Fluidic dies
US20200290365A1 (en) * 2017-12-02 2020-09-17 Hewlett-Packard Development Company, L.P. Fluid circulation and ejection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120056940A1 (en) * 2009-02-06 2012-03-08 Canon Kabushiki Kaisha Liquid ejection head and ink jet printing apparatus
US9211721B2 (en) * 2011-09-28 2015-12-15 Hewlett-Packard Development Company, L.P. Slot-to-slot circulation in a fluid ejection device
US20140184702A1 (en) * 2012-12-27 2014-07-03 Canon Kabushiki Kaisha Substrate for inkjet print head, inkjet print head, method for manufacturing inkjet print head, and inkjet printing apparatus
US20200238699A1 (en) * 2017-09-20 2020-07-30 Hewlett-Packard Development Company, L.P. Fluidic dies
US20200290365A1 (en) * 2017-12-02 2020-09-17 Hewlett-Packard Development Company, L.P. Fluid circulation and ejection

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