• 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:
    MOLDED PRINT BAR In one example, a print bar includes multiple die head molded into an elongated, monolithic body. The dies are generally disposed end-to-end along a length of the body and the body has a channel therethrough through which fluid can pass directly into the die.
    公开号:BR112015020862B1
    申请号:R112015020862-2
    申请日:2013-02-28
    公开日:2021-05-25
    发明作者:Chien-Hua Chen；Michael W. Cumbie；Silam J. Choy
    申请人:Hewlett-Packard Development Company, L.P.；
    IPC主号:
    专利说明:

    BACKGROUND
    [001] Each printhead array in an inkjet print pen or bar includes tiny channels that carry ink to the ejection chambers. Ink is distributed from the ink supply to the die channels through passages in a structure that supports the print head die(s) over the pen or print bar. It may be desirable to decrease the size of each printhead array, for example, to reduce the cost of the die, and therefore to reduce the cost of the pen or print bar. The use of smaller dies, however, may require changes to the larger structures that support the dies, including passageways that deliver ink to the dies. DRAWINGS
    [002] Each pair of figures 1/2, 3/4, 5/6, and 7/8 illustrates 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.
    [003] 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 1-8.
    [004] Figure 10 is a block diagram illustrating an inkjet printer implementing an example of a new fluid flow structure for printheads in a substrate-wide print bar.
    [005] Figures 11-16 illustrate an inkjet print bar implementing an example of a new fluid flow structure for a printhead array, such as can be used in the printer of figure 10.
    [006] Figures 17-21 are sectional views illustrating an example of a process for fabricating a new printhead die fluid flow structure.
    [007] Figure 22 is a flowchart of the process shown in figures 17-21.
    [008] Figures 23-27 are perspective views illustrating an example of a blade level process for manufacturing a new inkjet print bar such as the print bar shown in Figures 11-16.
    [009] Figure 28 is a detail of Figure 23.
    [010] Figures 29-31 illustrate other examples of a new fluid flow structure for a printhead array.
    [011] Equal part numbers designate equal or similar parts for all figures. Figures are not necessarily to scale. The relative size of some parts is exaggerated to more clearly illustrate the example shown. DESCRIPTION
    [012] Inkjet printers that utilize a substrate-wide print bar assembly have been developed to help increase print speeds and reduce printing costs. Conventional broad substrate print bar assemblies include multiple parts that carry printing fluid from the printing fluid supplies to the small printhead dies from which the printing fluid is ejected onto the paper or other printing substrate. While reducing the size and spacing of printhead arrays remains important to reduce cost, channeling print fluid from larger supply components to much smaller more closely spaced arrays requires complex flow structures and manufacturing processes that can actually increase cost .
    [013] A new fluid flow structure has been developed to enable the use of smaller printhead arrays and more compact array circuitry to help reduce cost in substrate-wide inkjet printers. A print bar implementing an example of the new structure includes multiple print head dies molded into an elongated monolithic body of moldable material. Body-molded print fluid channels carry print fluid directly to print fluid flow passages in each die. Molding actually increases the size of each die to make external fluid connections and to secure the dies to other structures, thus enabling the use of smaller dies. The printhead dies and print fluid channels can be molded at the blade level to form a new composite printhead blade with embedded print fluid channels, eliminating the need to form the print fluid channels in one. silicon substrate and enabling the use of thinner matrices.
    [014] The new fluid flow structure is not limited to print bars or other types of print head structures for inkjet printing, and 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 molding having a channel or other path for fluid to flow directly into or over the device. The microdevice, for example, can be an electronic device, a mechanical device, or a microelectromechanical system device (MEMS). The fluid flow, for example, may be a coolant flow to or over a microdevice or fluid flow to a printhead die or to another fluid dispensing microdevice.
    [015] These and other examples shown in the figures and described below illustrate, but do not limit the invention, which is defined in the claims following this description.
    [016] As used herein, a "micro device" means a device having one or more external dimensions equal to or less than 30 mm; “thin” means a thickness equal to or less than 650 µm; a “slice” means a thin microdevice having a length to width (L/W) ratio of at least three; a "printhead" and a "printhead array" means that portion of an inkjet printer or other inkjet type dispenser that dispenses fluid through one or more openings. A print head includes one or more print head dies. “Print head” and “print head array” are not limited to printing with ink and other printing fluids, but also include dispensing inkjet types of other fluids and/or for uses other than printing.
    [017] Figures 1 and 2 are section views in elevation and plan view, respectively, illustrating an example of a new fluid flow structure 10. Referring to Figures 1 and 2, the structure 10 includes a molded microdevice 12 in a monolithic body 14 of plastic or other moldable material. A molded body 14 is also referred to herein as a molding 14. Microdevice 12, for example, can be an electronic device, a mechanical device, or a microelectromechanical system device (MEMS). A channel or other suitable fluid flow path 16 is molded in body 14 in contact with microdevice 12 such that fluid in channel 16 can flow directly into or over device 12 (or both). In this example, channel 16 is connected to fluid flow passages 18 in microdevice 12 and exposed to outer surface 20 of microdevice 12.
    [018] In another example, shown in Figures 3 and 4, the flow path 16 in molding 14 allows air or other fluid to flow along an outer surface 20 of microdevice 12, for example, to cool 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, the exposed surface 26 is opposite channel 16. In another example, shown in Figures 7 and 8, microdevices 12A and 12B are molded into body 14 with fluid flow channels 16A and 16B. In this example, stream channels 16A contact the edges of external devices 12A while stream channel 16B contacts the bottom of internal device 12B.
    [019] Figure 9 is a block diagram illustrating a system 28 implementing a new fluid flow structure 10 such as one of the flow structures 10 shown in figures 1-8. Referring to Figure 9, system 28 includes a fluid source 30 operatively connected to a fluid mover 32 configured to displace fluid to flow path 16 in structure 10. A fluid source 30 may include, for example, a atmosphere as an air source to cool an electronic microdevice 12 or a supply of printing fluid to a printhead microdevice 12. The fluid mover 32 represents a pump, a fan, gravity or any other suitable mechanism for displacing fluid from the source 30 for flow structure 10.
    [020] Figure 10 is a block diagram illustrating an inkjet printer 34 implementing an example of a new fluid flow structure 10 in a substrate-wide print bar 36. Referring to Figure 10, the printer 34 includes print bar 36 extending over the width of a print substrate 38, flow regulators 40 associated with print bar 36, a substrate transport mechanism 42, ink or other fluid supplies. printer 44 and a printer controller 46. Controller 46 represents the programming, processor(s) and associated memories, and the electronic circuitry and components necessary to control the operating elements of a printer 10. The print bar 36 includes a arrangement of print heads 37 for dispensing printing fluid onto a continuous sheet or sheet of paper or other print substrate 38. As described in detail below, each print head impression 37 includes one or more printhead dies in a mold with channels 16 to supply printing fluid directly to the die(s). Each printhead array receives print fluid via a flow path from supplies 44 to and through flow regulators 40 and channels 16 in print bar 36.
    [021] Figures 11-16 illustrate an inkjet print bar 36 implementing an example of a new fluid flow structure 10 as may be used in printer 34 shown in figure 10. Referring first to the view 11, the printheads 37 are embedded in an elongated monolithic molding 14 and generally arranged in an end-to-end mode in rows 48 in a stepped configuration in which the printheads in each row overlap one another. printhead in that row. Although four rows 48 of staggered print heads 37 are shown, to print four different colors, for example, other suitable configurations are possible.
    [022] Figure 12 is a sectional view taken along line 12-12 in Figure 11. Figures 13-15 are detail views of Figure 12, and Figure 16 is a plan view diagram showing the layout of some of the features of the printhead matrix 10 flow structure in figures 12-14. Referring now to Figures 11-15, in the example shown, each printhead 37 includes a pair of printhead dies 12, each with two rows of ejection chambers 50 and corresponding orifices 52 through which flow fluids. print is ejected by chambers 50. Each channel 16 in mold 14 supplies print fluid to a print head die 12. Other suitable configurations for print head 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 printbar 36 and printheads 37 are facing up in Figures 12-15, the print bar 36 and print heads 37 usually face down when installed in a printer, as shown in the block diagram of figure 10.
    [023] Printing fluid flows into each ejection chamber 50 from a dispenser 54 extending lengthwise along each die 12 between the two rows of ejection chambers 50. Printing fluid is supplied to the dispenser 54 through multiple ports 56 that are connected to a printing fluid supply channel 16 on die surface 20. The printing fluid supply channel 16 is substantially wider than the printing fluid ports 56, as shown. , for charging printing fluid from larger, freely spaced passages in the flow regulator or other parts that carry printing fluid into the print bar 36 to the smaller, tightly spaced print fluid ports 56 in the printhead die 12. Thus, the printing fluid supply channels 16 can help reduce or even eliminate the need for distinct "scatter" and other structures. fluid routing required on some conventional printheads. Furthermore, exposing a substantial area of the printhead die 20 surface directly to the channel 16, as shown, allows printing fluid in the channel 16 to help cool the die 12 during printing.
    [024] The idealized representation of a printhead array 12 in figures 11-15 shows the three layers 58, 60, 62 for convenience only to clearly show the ejection chambers 50, orifices 52, manifold 54 and ports 56. An actual inkjet printhead array 12 is a typically complex integrated circuit (IC) structure formed on a silicon substrate 58 with layers and elements not shown in figures 11-15. For example, a thermal ejector element or piezoelectric ejector element formed in substrate 58 in each ejection chamber 50 is actuated to eject drops or streams of ink or other printing fluid through orifices 52.
    [025] A molded flow structure 10 enables the use of the long, narrow and very thin printhead arrays 12. For example, it has been shown that a printhead array 12 of 100 μm thickness with about 26 mm 500 µm long and 500 µm wide can be molded into a 500 µm thick body 14 to replace a conventional 500 µm thick silicon printhead die. Not only is it cheaper and easier to shape the channels 16 in the body 14 when compared to forming the feed channels on a silicon substrate, but it is also cheaper and easier to form the printing fluid ports 56 into a thinner matrix. 12. For example, ports 56 on a 100 µm thick printhead 12 array can be formed through dry etching and other micromachining techniques not practical suitable for thicker substrates. Micromachining a high-density array of straight or slightly tapered ports 56 onto a thin silicon, glass or other substrate 58 rather than forming conventional slits leaves a stronger substrate while still providing adequate printing fluid flow. Tapered ports 56 help to displace air bubbles away from manifold 54 and ejection chambers 50 formed, for example, in a monolithic or multilayer orifice plate 60/62 applied to substrate 58. Handling equipment is expected to of matrix and current microdevice molding tools and techniques can be adapted for molding dies 12 as thin as 50 µm, with a length/width ratio of up to 150, and for molding channels 16 as narrow as 30 µm. And molding 14 provides an effective and inexpensive structure in which multiple rows of such die slices can be supported in a single monolithic body.
    [026] Figures 17-21 illustrate an example process for fabricating a new printhead fluid flow structure 10. Figure 22 is a flowchart of the process illustrated in Figures 17-21. Referring first to Figure 17, a flexible circuit 64 with conductive traces 22 and protective layer 66 is laminated onto a magazine 68 with a thermal release tape 70, or otherwise applied to the magazine 68 (step 102 in the figure 22). As shown in Figures 18 and 19, the printhead die 12 is placed orifice side down in the opening 72 in the charger 68 (step 104 in Figure 22) and the conductor 22 is joined to an electrical terminal 24 in matrix 12 (step 106 in figure 22). In Fig. 20, a molding tool 74 forms channel 16 in a molding 14 around printhead die 12 (step 108 in Fig. 22). A tapered channel 16 may be desirable in some applications to facilitate release of molding tool 74 or to increase spread (or both). After molding, the printhead flow structure 10 is released from magazine 68 (step 110 in Figure 22) to form the completed portion shown in Figure 21 in which conductor 22 is covered by layer 66 and surrounded by molding 14. In In a transfer molding process such as that shown in Figure 20, the channels 16 are molded into the body 14. In other manufacturing processes, it may be desirable to form the channels 16 after molding the body 14 around the printhead die 12.
    [027] Although the molding of a single printhead die 12 and channel 16 is shown in Figures 17-21, multiple printhead arrays and print fluid channels can be molded simultaneously at the blade level. Figures 23-28 illustrate an example blade level process for making print bars 36. Referring to Figure 23, print heads 37 are placed on a glass or other suitable carrier blade 68 in a pattern of multiples. print bars. Although a "blade" is sometimes used to denote a round substrate while a "panel" is used to denote a rectangular substrate, a "blade" as used herein includes any form of substrate. Printheads 37 will usually be placed on charger 68 after first applying or forming a pattern of leads 22 and die apertures 72 as described above with reference to Figure 17 and step 102 in Figure 22.
    [028] In the example shown in Figure 23, five sets of dies 78, each having four rows of print heads 37, are arranged on the carrier blade 66 to form five print bars. A substrate-wide print bar for printing on letter or A4 sized substrates with four rows of print heads 37, for example, is about 230 mm long and 16 mm wide. Thus, five arrays of dies 78 can be arranged on a single 270mm x 90mm carrier blade 66 as shown in figure 23. Again, in the example shown, a set of conductors 22 extends to connecting islands 23 nearby. from the edge of each row of printheads 37. Conductors 22 and connecting islands 23 are more clearly visible in the detail of Figure 28 (conductive signal traces for individual ejection chambers or groups of ejection chambers such as conductors 22 in Figure 21 have been omitted so as not to obscure other structural features).
    [029] Figure 24 is an enlarged sectional view of a four-row printhead assembly 37 taken along line 24-24 in Figure 23. Cross hatching has been omitted for clarity. Figures 23 and 24 show the blade structure in process after completion of steps 102-112 in figure 23. Figure 25 shows the section of figure 24 after molding step 114 in figure 23 where the body 14 with the channels 16 is molded around the printhead dies 12. The individual print bar strips 78 are separated in Figure 26 and released from the magazine 68 in Figure 27 to form five individual print bars 36 (step 116 in Figure 23). While any suitable molding technology can be used, tests suggest that blade-level molding tools and techniques currently used for semiconductor device compaction can be cost-effectively adapted to fabricate printhead array fluid flow structures. 10 such as those shown in figures 21 and 27.
    [030] A more rigid molding 14 can be used where a rigid (or at least less flexible) print bar 36 is desired to retain the print head dies 12. A less rigid mold 14 can be used where a print bar Flexible 36 is desired, for example, where another support structure retains the print bar rigidly in a single plane or where a non-flat print bar configuration is desired. Also, although it is expected that molded body 14 will usually be molded as one monolithic part, body 14 may also be molded as more than one part.
    [031] Figures 29-31 illustrate other examples of a new fluid flow structure 10 for a printhead die 12. In these examples, channels 16 are molded into body 14 along each side of the printhead die. printing 12 using, for example, a transfer molding process such as the one described above with reference to Figures 17-21. Printing fluid flows from channels 16 through ports 56 laterally into each ejection chamber 50 directly from channels 16. In the example of Figure 30, orifice plate 62 is applied after molding body 14 to close channels 16. In the example of Fig. 31, a cover 80 is formed over the orifice plate 62 to close off the channels 16. Although a separate cover 80 partially defining the channels 16 is shown, an integral cover 80 molded into the body 14 can also be used.
    [032] As noted 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 is not to be interpreted to limit the scope of the invention, which is defined in the following claims.
    权利要求:
    Claims (11)
    [0001]
    1. Print bar, comprising a plurality of printhead dies (12) molded into an elongated monolithic body (14) of plastic, the printhead dies (12) generally disposed end to end along a length of the the body (14) and the body (14) have at least one channel (16) in contact with the printhead dies (12) so that fluid can pass directly to the printhead dies (12), wherein each printhead array (12) is a thin array; and each thin die is a die slice; wherein each die slice includes: multiple orifices connected to the channel (16) so that printing fluid can flow from the channel (16) directly to the orifices; a collector (54 ) connected to the orifices so that printing fluid can flow from the orifices directly into the collector (54); in multiple ejection chambers (50) connected to the collector (54) so that the printing fluid can flow from the collector (54) to the ejection chambers (50); channel (16) to a narrower part in the collector (54); and the channel (16) is molded into the body (14) and tapered from a wider part away from the holes to a narrower part towards the holes.
    [0002]
    2. Print bar according to claim 1, characterized in that: the matrix blades (12) are arranged in rows along the length of the body (14) in a stepped configuration in which the matrix blades ( 12) in each row overlap the other matrix strip (12) in that row; and the channel (16) includes multiple channels, each allowing fluid to pass directly into one or more of the die chips (12).
    [0003]
    3. Print bar according to claim 2, characterized in that: each strip of the matrix (12) includes a front with holes (52) through which fluid can be dispensed from the strip of the matrix (12), a back opposite front and sides between front and back; and a channel (16) is located along at least one side of each strip of matrix (12).
    [0004]
    4. Print bar according to claim 2, characterized in that: each matrix strip (12) includes a front with holes (52) through which fluid can be dispensed from the matrix strip (12), a back opposite front and sides between front and back; and a channel (16) is located along the rear of each die strip (12).
    [0005]
    5. Print bar, according to claim 2, characterized in that the monolithic body (14) supports the strips of the matrix (12) in a single plane.
    [0006]
    6. Print bar according to claim 1, characterized in that the body (14) is molded around the thin molds (12), the molded body (14) having several channels inside through which the fluid it can pass directly to the dies (12), and dies (12) arranged in rows in a staggered configuration in which the dies (12) in each row overlap the other dies (12) in that row.
    [0007]
    7. Print bar, according to claim 6, characterized in that the body (14) supports the arrays (12) in a single plane.
    [0008]
    8. Print bar according to claim 6, characterized in that each matrix (12) includes an electrical terminal and the print bar further comprises conductors connected to the terminals, the body (14) molded around the conductors and of the terminals.
    [0009]
    9. Print bar, according to claim 1, characterized in that it comprises: several printhead matrix blades, each including ejection chambers, passages through which the fluid can pass to the ejection chambers, a front with holes through which fluid can be ejected from the ejection chambers and an opposite rear part to the front; and a molding partially encapsulating the dies (12) with multiple channels therein connected directly to passageways in the die chips.
    [0010]
    10. Print bar, according to claim 9, characterized in that the channels are molded in molding.
    [0011]
    11. Print bar, according to claim 1, characterized in that it comprises several thin printhead arrays (12) incorporated in the body (14).
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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]|
    2020-04-28| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-09-01| B25G| Requested change of headquarter approved|Owner name: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (US) |
    2021-04-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-25| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|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/US2013/028216|WO2014133517A1|2013-02-28|2013-02-28|Molded print bar|
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