• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    a fluid flow structure shaped in one example, a fluid flow structure includes a microdevice embedded in a molding that has a channel there, through which a fluid can flow directly into the device and / or over the device.
    公开号:BR112015020860B1
    申请号:R112015020860-6
    申请日:2013-02-28
    公开日:2021-04-13
    发明作者:Chien-Hua Chen；Michael W. Cumbie
    申请人:Hewlett-Packard Development Company, L.P.；
    IPC主号:
    专利说明:

    BACKGROUND
    [0001] Each printhead array on an inkjet pen or print bar includes minimal channels that carry ink into the ejection chambers. The ink is distributed from the ink supply to the matrix channels through passages in a structure that supports the printhead matrix (s) in the pen or print bar. It may be desirable to reduce the size of each printhead die, for example, to reduce the cost of the die, and thus to reduce the cost of the pen or the print bar. The use of smaller dies, however, may require changes to the larger structures that support the dies, including the passages that distribute the ink to the dies. DRAWINGS
    [0002] Each pair of figures 1/2, 3/4, 5/6 and 7 / 8illustrates an example of a new molded fluid flow structure, in which a microdevice is embedded in a mold with a fluid flow path directly to the device.
    [0003] Figure 9 is a block diagram illustrating a fluid flow system implementing a new fluid flow structure, such as one of the examples shown in figures 1 to 8.
    [0004] Figure 10 is a block diagram illustrating an inkjet printer implementing an example of a new fluid flow structure for the printheads on a wide substrate printing bar.
    [0005] Figures 11 to 16 illustrate an inkjet printing bar implementing an example of a new fluid flow structure for a printhead matrix, such as could be used in the printer of figure 10.
    [0006] Figures 17 to 21 are sectional views that illustrate an example of a process for making a new printhead matrix fluid flow structure.
    [0007] Figure 22 is a diaphragm of the process shown in figures 17 to 21.
    [0008] Figures 23 to 27 are seen in perspective that illustrate an example of a tablet level process for making a new inkjet printing bar, such as the printing bar shown in figures 11 to 16.
    [0009] Figure 28 is a detail of figure 23.
    [0010] Figures 29 to 31 illustrate other examples of a new fluid flow structure for a printhead matrix.
    [0011] The same part numbers designate the same or similar parts for all figures. Figures are not necessarily to scale. The relative size of some parts is exaggerated to illustrate the example shown more clearly. DESCRIPTION
    [0012] Inkjet printers using a wide substrate printing bar assembly have been developed to help increase printer speeds and reduce printer costs. Conventional wide substrate printing bar assemblies include multiple parts that carry a printing fluid from the printing fluid supplies to the small printhead arrays from which the printing fluid is ejected onto paper or another printing substrate. Although a reduction in the size and spacing of the printhead arrays remains important for cost reduction, channeling printing fluid from the larger supply components to increasingly tightly spaced, ever-smaller arrays requires structures of complex flow and manufacturing processes that can actually increase the cost.
    [0013] A new fluid flow structure has been developed, to allow the use of smaller printhead arrays and a more compact array circuit, to help reduce the cost of large substrate inkjet printers. A print bar implementing an example of the new structure includes multiple printhead arrays molded into an elongated monolithic body of moldable material. The print fluid channels molded in the body carry a print fluid directly to print fluid flow passages in each die. Effectively molding increases the size of each matrix for making external fluid connections and for affixing the matrices to other structures, thus allowing the use of smaller matrices. The printhead arrays and the print fluid channels can be molded at the insert level to form a new composite printhead insert with built-in print fluid channels, eliminating the need to form the print fluid channels. printing on a silicon substrate and allowing the use of thinner matrices.
    [0014] The new fluid flow structure is not limited to print bars or other types of printhead structures for inkjet printing, but can be implemented in other devices and for other fluid flow applications. Thus, in one example, the new structure includes a microdevice embedded in a mold that has a channel or other path for a fluid to flow directly into or over the device. The microdevice, for example, could be an electronic device, a mechanical device, or a microelectromechanical system device (MEMS). The fluid flow, for example, could be a coating fluid flow in or over the microdevice or a fluid flow to a printhead array or other fluid delivery microdevice.
    [0015] These and other examples shown in the figures and described below illustrate, but do not limit the invention, which is defined in the Claims which follow this Description.
    [0016] As used in this document, a “microdevice” means a device that has one or more external dimensions less than or equal to 30 mm; “Thin” means a thickness less than or equal to 650 μm; a "split" means a thin microdevice having a length-to-width (L / W) ratio of at least three; a "printhead" and a "printhead array" means that part of an inkjet printer or other inkjet type dispenser that dispenses fluid from one or more openings. A printhead includes one or more printhead arrays. “Printhead” and “printhead matrix” are not limited to printing with ink or other printing fluids, but also include an inkjet type distribution of other fluids and / or for uses other than printing .
    [0017] Figures 1 and 2 are seen in section in elevation and planes, respectively, illustrating an example of a new fluid flow structure 10. With reference to figures 1 and 2, structure 10 includes a microdevice 12 molded in a monolithic body 14 of plastic or other moldable material. A molded body 14 is also referred to here as a molding 14. The microdevice 12, for example, could be an electronic device, a mechanical device, or a microelectromechanical system (MEMS) device. A channel or other suitable fluid flow path 16 is molded in the body 14 in contact with the microdevice 12, so that a fluid in the channel 16 can flow directly into or over the device 12 (or both). In this example, channel 16 is connected to fluid flow passages 18 in microdevice 12 and exposed to an outer surface 20 of microdevice 12.
    [0018] In another example, shown in figures 3 and 4, the flow path 16 in the mold 14 allows air or other fluid to flow along an external surface 20 of microdevice 12, for example, for cooling the device 12. Also, in this example, signal traces or other conductors 22 connected to device 12 at electrical terminals 24 are molded into molding 14. In another example, shown in figures 5 and 6, microdevice 12 is molded into body 14 with an exposed surface 26 opposite channel 16. In another example, shown in figures 7 and 8, microdevices 12A and 12B are molded in body 14 with fluid flow channels 16A and 16B. In this example, flow channels 16A contact the edges of external devices 12A, while flow channel 16B contacts the bottom of internal device 12B.
    [0019] Figure 9 is a block diagram illustrating a system 28 that implements a new fluid flow structure 10, such as one of the flow structures 10 shown in figures 1 to 8. With reference to figure 9, the system 28 includes a fluid source 30 operatively connected to a fluid mover 32 configured to move a fluid into the flow path 16 in structure 10. A fluid source 30 could include, for example, the atmosphere as a source of cooling air. from electronic microdevice 12 or a supply of printing fluid to a printhead microdevice 12. Fluid mover 32 represents a pump, a fan, gravity or any other mechanism suitable for the movement of a fluid from source 30 to flow structure 10.
    [0020] Figure 10 is a block diagram illustrating an inkjet printer 34 implementing an example of a new fluid flow structure 10 on a substrate width printing bar 36. With reference to figure 10, the printer 34 includes the print bar 36 that covers the width of a print substrate 38, flow regulators 40 associated with the print bar 36, a substrate transport mechanism 42, ink supplies or other printing fluid 44, and a printer controller 46. Controller 46 represents programming, processor (s) and associated memories, and the electronic circuit and components necessary to control the operating elements of a printer 10. The print bar 36 includes an array of printheads 37 for distributing printing fluid onto a sheet or a continuous strip of paper or other printing substrate 38. As described in detail below, each printhead 37 includes a the one or more printhead arrays in a molding with channels 16 for feeding the printing fluid to the array (s). Each printhead array receives a print fluid through a flow path from supplies 44 to and through flow regulators 40 and channels 16 on the print bar 36.
    [0021] Figures 11 to 16 illustrate an inkjet printing bar 36 that implements an example of a new fluid flow structure 10, as it could be used in printer 34 shown in figure 10. With reference first to the plan view of figure 11, the printheads 37 are embedded in an elongated monolithic molding 14 and generally arranged end to end in rows 48 in an alternating configuration, in which the printheads in each row overlap with another printhead in that row . Although four rows 48 of alternating printheads 37 are shown, for printing in four different colors, for example, other suitable configurations are possible.
    [0022] Figure 12 is a sectional view taken along line 12-12 in figure 11. Figures 13 to 15 are detailed views from figure 12, and figure 16 is a plan view diagram showing the layout of some of the printhead matrix flow structure features 10 in figures 12 through 14. With reference now to figures 11 through 15, in the example shown, each printhead 37 includes a pair of printhead arrays printing press 12, each with two rows of ejection chambers 50 and corresponding orifices 52, through which a printing fluid is ejected from chambers 50. Each channel 16 in mold 14 supplies a printing fluid to a printhead die 12. Other configurations suitable for the printhead 37 are possible. For example, more or less printhead arrays 12 can be used with more or less ejection chambers 50 and channels 16. (Although the print bar 36 and the printheads 37 face upward in figures 12 to 15, the print bar 36 and the printheads 37 usually face downwards when installed in a printer, as described in the block diagram of figure 10).
    [0023] The printing fluid flows to each ejection chamber 50 from a collector 54 that extends lengthwise along each die 12 between two rows of ejection chambers 50. The printing fluid is fed to the collector 54 through multiple windows 56 which are connected to a print fluid supply channel 16 on the die surface 20. The print fluid supply channel 16 is substantially wider than the print fluid windows 56, as shown, to carry the printing fluid from larger loosely spaced passages in the flow regulator or other parts that carry printing fluid to the print bar 36 for the tightly spaced smaller print fluid windows 56 in the matrix printhead 12. Thus, the fluid supply channels 16 can help reduce or even eliminate the need for discrete “spreading” and other ro structures. fluid needed in some conventional printheads. In addition, exposing a substantial area of the printhead die surface 20 directly to channel 16, as shown, allows a printing fluid in channel 16 to help cool the die 12 during printing.
    [0024] The idealized representation of a printhead matrix 12 in figures 11 to 15 describes three layers 58, 60, 62 for convenience only, to show clearly the ejection chambers 50, the holes 52, the collector 54 and the windows 56. A real inkjet printhead array 12 is typically a complex integrated circuit (IC) structure formed on a silicon substrate 58 with layers and elements not shown in figures 11 through 15. For example, an element thermal ejector or a piezoelectric ejector element formed on the substrate 58 in each ejection chamber 50 is actuated to eject drops or streams of ink or other printing fluid from the orifices 52.
    [0025] A molded flow structure 10 allows the use of long, thin and very narrow printhead arrays 12. For example, it has been shown that a 100 μm thick printhead 12 matrix that is around 26 mm long and 500 μm wide can be molded into a 500 μm thick body 14 to replace a matrix of conventional 500 μm thick silicon printhead. Not only is it cheaper and easier to mold the channels 16 in the body 14, compared to the formation of the feeding channels on a silicon substrate, but it is also cheaper and easier to form the printing fluid windows 56 in a matrix. thinner 12. For example, windows 56 in a 100 μm thick printhead array 12 can be formed by dry chemical attack or other suitable micro-machining techniques not practical for thicker substrates. A micromachining of a high density arrangement of straight or slightly tapered straight windows 56 on a thin silicon, glass or other substrate 58, instead of forming conventional slits, leaves a stronger substrate, while still providing a flow of printing fluid adequate. The tapered windows 56 help to move air bubbles away from the collector 54 and the ejection chambers 50 formed, for example, in a 60/62 monolithic or multilayer orifice plate applied to the substrate 58. Handling equipment is expected to printhead matrix and microdevice molding tools and techniques can be adapted for molding channels 16 as narrow as 30 μm. And molding 14 provides an effective, yet inexpensive structure, in which multiple rows of these matrix divisions can be supported in a single monolithic body.
    [0026] Figures 17 to 21 illustrate an exemplary process for making a new printhead fluid flow structure. Figure 22 is a flow diagram of the process illustrated in figures 17 to 21. Referring first to figure 17 , a flexible circuit 64 with conductive traces 22 and protective layer 66 is laminated on a carrier 68 (step 102 in figure 22). As shown in figures 18 and 19, the printhead matrix 12 is placed with the orifice side facing downward in the opening 72 in the carrier 68 (step 104 in figure 22) and a conductor 22 is connected to an electrical terminal 24 in the matrix 12 (step 106 in figure 22). In figure 20, a molding tool 74 forms the channel 16 in a molding 14 around the printhead matrix 12 (step 108 in figure 22). A tapered channel 16 may be desirable in some applications, to facilitate the release of the molding tool 74 or to increase spreading (or both). After molding, the printhead flow structure 10 is released from carrier 68 (step 110 in figure 22) to form the complete part shown in figure 21, where conductor 22 is covered by layer 66 and surrounded by molding 14. In a transfer molding process, such as the one shown in figure 20, channels 16 are molded into the body 14. In other manufacturing processes, it may be desirable to form channels 16 after molding the body 14 around the printhead array 12.
    [0027] Although the molding of a single print head array 12 and a channel 16 is shown in figures 17 to 21, multiple print head arrays and multiple print fluid channels can be molded simultaneously at the insert level. Figures 23 to 28 illustrate an example insert level process for making print bars 36. Referring to Figure 23, the printheads 37 are placed on a glass or another suitable carrier insert 68 in a multiple pattern. printing bars. (Although a “tablet” is sometimes used to denote a round substrate, while a “panel” is used to denote a rectangular substrate, a “tablet” as used in this document includes a substrate of any shape.) The printheads 37 will usually be placed on the carrier 68, after first applying or forming a conductor pattern 22 and matrix openings 72, as described above with reference to figure 17 and in step 102 in figure 22.
    [0028] In the example shown in figure 23, five sets of dies 78, each having four rows of print heads 37 are arranged on a carrier 66 for forming five print bars. A substrate width printing bar for printing on letter or A4 size substrates with four rows of printheads 37, for example, is around 230 mm long and 16 mm wide. Thus, five sets of die 78 can be arranged on a single 270 mm x 90 mm carrier insert 66, as shown in figure 23. Again, in the example shown, a conductor arrangement 22 extends to the connecting wedges 23 close to the edge of each row of printheads 37. Conductors 22 and connection pads 23 are most clearly visible in the detail in figure 28. (The conductive signal traces for individual ejection chambers or groups of ejection chambers, such as like conductors 22 in figure 21, are omitted in order not to obscure other structural features).
    [0029] Figure 24 is a detailed cross-sectional view of a set of four printhead rows 37 taken along line 24-24 in Figure 23. A cross hatch is omitted for clarity. Figures 23 and 24 show the insert structure in process after the completion of steps 102 to 112 in figure 23. Figure 25 shows the section of figure 24 after the molding step 114 in figure 23, in which the body 14 with the channels 16 is molded around the printhead arrays 12. The individual print bar strips 78 are separated in figure 26 and released from carrier 68 in figure 27 to form five individual print bars 36 (step 116 in figure 23). Although any suitable molding technology can be used, the tests suggest that insert-level molding tools and techniques currently used for packaging the semiconductor device can be cost-effectively adapted to the fabrication of matrix fluid flow structures. printhead 10, such as those shown in figures 21 and 27.
    [0030] A more rigid impression 14 can be used, in which a rigid (or at least less flexible) print bar 36 is desired for maintenance of the printhead arrays 12. A less rigid impression 14 can be used when a flexible print bar 36 is desired, for example, when another support structure holds the print bar rigidly in a single plane, or when a non-flat print bar configuration is desired. Also, although it is not expected that the molded body 14 will usually be molded as a monolithic part, the body 14 could be molded as more than one part.
    [0031] Figures 29 to 31 illustrate other examples of a new fluid flow structure 10 for a printhead matrix 12. In these examples, channels 16 are molded in body 14 along each side of the printhead matrix. impression 12, for example, using a transfer molding process, as described above with reference to figures 17 to 21. The impression fluid flows from channels 16 through windows 56 laterally in each ejection chamber 50 directly from the channels 16. In the example in figure 30, an orifice plate 62 is applied after molding the body 14 to close the channels 16. In the example in figure 31, a cover 80 is formed on the orifice plate 62 for closing of the channels 16. Although a discrete cover 80 partially defining the channels 16 is shown, an integrated cover 80 molded on the body 14 could also be used.
    [0032] As mentioned at the beginning of this Description, the examples shown in the figures and described above illustrate, but do not limit, the invention. Other examples are possible. Therefore, the foregoing description should not be construed to limit the scope of the invention, which is defined in the following claims.
    权利要求:
    Claims (11)
    [0001]
    1. Fluid flow structure (10), characterized by the fact that it comprises a fluid dispensing microdevice (12) comprising tapered fluid windows (56) and a monolithic molding (14) that has a tapered channel (16) in it, through from which a fluid can flow directly into the microdevice (12), wherein the microdevice (12) fluid dispenser includes a fluid flow passage (18) connected directly to the channel (16), and is embedded in the molding (14) , and where the microdevice (12) is a printhead matrix that has a thickness less than or equal to 650 μm; where the channel (16) is connected to the fluid window (56), where the fluid feeds through the fluid window (56), and where the channel (16) is wider than the print fluid window (56 ).
    [0002]
    2. Structure according to claim 1, characterized in that the channel (16) is molded in the molding (14).
    [0003]
    3. Structure according to any one of the preceding claims, characterized in that the channel (16) comprises an open channel exposed to an external surface (20) of the microdevice (12).
    [0004]
    4. Structure according to any one of the preceding claims, characterized in that the microdevice (12) comprises an electronic device that includes an electrical terminal, and the structure (10) still comprises a conductor (22) connected to the terminal (24 ) and embedded in the molding (14).
    [0005]
    5. Structure according to claim 4, characterized in that the microdevice (12) comprises a printhead matrix division that includes a fluid flow passage (18) connected directly to the channel (16).
    [0006]
    6. Fluid flow structure (10, 36) according to any one of the preceding claims, characterized by the fact that it provides multiple printhead matrix divisions, and the monolithic body (14) is molded around multiple divisions of printhead matrix, the body (14) having a tapered channel (16) molded there, through which a fluid can flow directly into the divisions.
    [0007]
    7. Structure according to claim 6, characterized in that the channel comprises multiple channels (16) through which a fluid can flow directly into one or more of the divisions.
    [0008]
    8. Structure according to claim 6 or 7, characterized in that each printhead matrix division includes a fluid flow passage (56) connected directly to a channel (16).
    [0009]
    9. Structure according to claim 8, characterized in that each printhead matrix division comprises a silicon substrate (58), in which the fluid flow passage (56) is formed.
    [0010]
    10. System (28), characterized by the fact that it comprises: a fluid source (30), a fluid flow structure (10) as defined in any of the preceding claims; and a fluid mover (32) for moving fluid from the fluid source to the channel in the fluid flow structure.
    [0011]
    System (28) according to Claim 10, characterized in that: the fluid source includes a supply (44) of printing fluid; and the fluid mover includes a device (40) for regulating the flow of printing fluid from the supply (44) to the printhead die.
    类似技术:
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    US9676192B2|2017-06-13|Printbar and method of forming same
    US9889664B2|2018-02-13|Molded printhead structure
    JP6749879B2|2020-09-02|Formal print bar
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-07-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-17| B25G| Requested change of headquarter approved|Owner name: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (US) |
    2021-03-09| B09A| Decision: intention to grant|
    2021-04-13| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/02/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/US2013/028207|WO2014133516A1|2013-02-28|2013-02-28|Molded fluid flow structure|
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