Patent Publication Number: US-10780696-B2

Title: Printbars and methods of forming printbars

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present divisional patent application continuation application claims priority under 35 USC § 120 from copending U.S. patent application Ser. No. 15/113,533 filed on Jul. 22, 2016 by Chien et al. and entitled PRINTBARS AND METHODS OF FORMING PRINTBARS, which claims priority under 35 USC § 119 from PCT/US2014/013317 filed on Jan. 28, 2014 by Chien et al. and entitled PRINTBARS AND METHODS OF FORMING PRINTBARS, the full disclosures both of which are hereby incorporate by reference. 
    
    
     BACKGROUND 
     Printing devices are widely used and may include a printhead die enabling formation of text or images on a print medium. Such a printhead die may be included in an inkjet pen or printbar that includes channels that carry ink. For instance, ink may distributed from an ink supply to the channels through passages in a structure that supports the printhead die(s) on the inkjet pen or printbar. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram illustrating a printer implementing an example of a printbar according to the present disclosure. 
         FIG. 2  is a section view illustrating an example of a printbar according to the present disclosure. 
         FIGS. 3  is a section view illustrating an example of a stage in a process of forming a printbar according to the present disclosure. 
         FIG. 4  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 3  in a process of forming the printbar according to the present disclosure. 
         FIG. 5  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 4  in a process of forming the printbar according to the present disclosure. 
         FIG. 6  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 5  in a process of forming the printbar according to the present disclosure. 
         FIG. 7  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 6  in a process of forming the printbar according to the present disclosure. 
         FIG. 8  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 7  in a process of forming the printbar according to the present disclosure. 
         FIG. 9  is a plan view illustrating an example of a printbar according to the present disclosure. 
         FIG. 10  is a plan view illustrating an example of a printbar according to the present disclosure. 
         FIG. 11  is a flow diagram of an example of a process of forming a printbar according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Printers that utilize a substrate wide printbar assembly have been developed to help increase printing speeds and reduce printing costs. Substrate wide printbar assemblies often tend to include multiple parts that carry printing fluid from the printing fluid supplies to the small printhead dies from which the printing fluid is ejected on to paper or other print substrate. It may be desirable to shrink the size of a printhead die. However, decreasing the size of a printhead die can involve changes to structures that support the printhead die, including passages that distribute ink to the printhead die. While reducing the size and spacing of the printhead dies continues to be associated with reducing cost, channeling printing fluid from supply components to tightly spaced dies may in turn lead to comparatively complex flow structures and fabrication processes that can actually increase an overall cost associated with a printhead die. 
     Forming such complex flow structures may itself involve use of difficult processes and/or additional materials such as carrier boards having prefabricated openings that extend through the carrier board. A prefabricated opening refers to an opening and/or combination of opening that alone or together extend through the carrier board and that are formed prior to printhead die attachment. Prefabricated openings can, for example, include windows, ink feed slots, etc. that extend through such a carrier board. Carrier boards having prefabricated openings may prove costly, ineffective, and/or difficult (time-consuming) to procure and/or utilize, among other shortcomings. For instance, such prefabricated openings may lead to reduced structure integrity (compared to use of solid carrier boards that are without prefabricated openings) and/or other difficulties, such as undesired migration of an adhesive material into a prefabricated opening. 
     In contrast, the printbars and methods of forming printbars, as described herein, include a printed circuit board (PCB), adhesive material, a printhead die sliver, and a slot extending through the PCB and the adhesive material (e.g., a portion of the adhesive material) to the printhead die sliver (e.g., to an ink feed hole included in the printhead die sliver). Advantageously, the printbars and methods of forming the printbars of the present disclosure do not include a prefabricated opening in the PCB. Moreover, the PCB can include a dam surrounding a perimeter of a recess included in the PCB. Such a recess and/or a dam can promote adhesive material placement, printhead die positioning (e.g., positioning such that a top surface of the printhead die sliver is co-planar with a top surface of the dam), and/or printhead die attachment to the PCB, among other advantages. 
       FIG. 1  is a block diagram illustrating a printer implementing an example of a printbar according to the present disclosure. Referring to  FIG. 1 , a printer  134  (e.g., an inkjet printer) includes a printbar  136  spanning the width of a print substrate  138 , flow regulators  140  associated with the printbar  136 , a substrate transport mechanism  142 , ink or other printing fluid supplies  144 , and a printer controller  146 . The print controller  146  represents programming, processor(s) and associated memories, electronic circuitry, and/or other components to control operative elements (e.g., a printhead  137 ) of the printer  134 . 
     The printbar  136  includes an arrangement of printheads  137  to dispense printing fluid on to a sheet or continuous web of paper or other print substrate  138 . As described in detail below, each printhead  137  includes at least one printhead die sliver(s)  112  positioned in a recess (e.g., a recess  117  as illustrated in  FIG. 5 ) of a PCB  114 . In some examples, the die sliver(s)  112  can be positioned such that top surface(s) of the printhead die sliver(s) is co-planar with a top surface of a dam  121 , as described herein. 
     The printhead die sliver  112  can be formed of semiconductor material (e.g., silicon) and can include integrated circuitry (e.g., transistors, resistors, etc.). Each printhead die sliver  112  includes ink feed holes, thin-film layer (including firing chambers), and conductors. A slot feeds printing fluid directly to the printhead die(s), such as to ink feed hole(s) included in the printhead die sliver  112 . The ink feed holes provide printing fluid (e.g., ink) to fluid ejectors formed in the thin-film layer. Each printhead die sliver  112  includes an ejection chamber and a corresponding orifice through which printing fluid is ejected from the ejection chamber. 
     Each printhead die  112  receives printing fluid through a flow path from the printing fluid supplies  144  into and through the flow regulators  140  and slot(s)  116  in printbar  136  to ink feed hole(s) (not shown) included in the printhead die sliver  112 . Notably, as described herein, the slot  116  extends through a PCB  14  and an adhesive material to the printhead die sliver  112 . That is, the slot  116  is not prefabricated and advantageously promotes printhead die sliver  112  positioning and/or printhead die sliver adhesion, among other advantages. For example, the printbars of the present disclosure enable adhesive material to be continuously applied to a recesses and/or adhesive material to be located on a bottom surface of a printhead die sliver  112  without encountering issues associated therewith, such as undesired adhesive material migration (e.g., migration into the slot  116 ). Additional advantages associated with the printbar  136  include that the printbar does not have a fluidic fan-out component between the printheads  137  and the fluid supply, among other advantages. 
       FIG. 2  is a section view illustrating an example of a printbar module  236  according to the present disclosure. Such a printbar  236  can be used in printer  134  shown in  FIG. 1 , according to an example implementation. The printbar illustrated in  FIG. 2  and  FIG. 8  is single printbar module, for example, formed after completion of as the process described with respect to  FIG. 11 . The elements described with respect to  FIG. 2  are analogous those described with respect to  FIG. 3-8 . In FIG.  2 , and similarly in  FIGS. 3-8 , a portion of the dam  221  surrounding the recess  221  which would otherwise obscure the elements located behind the dam in the from the vantage of a section view has been purposefully omitted in an effort to clearly indicate the elements included in the Figures. 
     The printbar  236  includes a PCB  214 . The PCB  214  refers to a cured epoxy composition having conductive elements  213  (e.g., conductive signal traces and/or bond pads) included therein that can include particulate matter and/or structures (e.g., fiberglass structures, etc.) embedded in the epoxy, such as FR4 board. The PCB  214  is a continuous solid, as opposed to carrier boards that include prefabricated openings. 
     The PCB  214  includes a recess  217 . The recess  217  extends partially into the PCB  214 , for example, as illustrated in  FIG. 3 . In some examples, the recess  217  can be included in a plurality of recesses that each extends partially into the PCB  214 . However, the recess  217  (or the plurality of recesses), alone or in combination with other geometric feature(s) in the PCB  214 , does not extend through the PCB  214  (e.g., does not extend completely through a total depth of). 
     Formation of a recess  217  can include removal of a portion of the PCB  214  designated to become the recess and/or addition of material to the PCB  214  surrounding an area of the PCB designated to become the recess, among other methods of forming the recess. For example, a recess, such as recess  217 , can be formed prior to die attachment by addition of material to the PCB  214 , such as a dam  221 . That is, in some examples, the PCB  214  includes a dam  221  surrounding a perimeter of the recess  217 . The dam can, for example, be located as around (e.g., forming a perimeter) of an area of the PCB  214  designated to be the recess  217 . Such added material can be the same or dissimilar to a material(s) include in the PCB  214  prior to adding the additional material. For example, the additional material can, in some examples, include an additional epoxy layer of the same or dissimilar epoxy included in PCB  214  on which the additional material is placed. 
     The recess  217  can include an adhesive material, such as adhesive material  215 , on (e.g., disposed on) a bottom surface  219  of the recess  217 . The adhesive material, such as adhesive material  215 , refers to an epoxy, among other adhesive materials suitable to form the printbar modules, as described herein. 
     In some examples, the adhesive material can include a continuous adhesive material disposed on the bottom surface  219  of the recess  217 . Such a continuous application may not be possible in PCB  14  having a prefabricated opening(s) as the adhesive material would undesirably migrate into the prefabricated opening(s). However, continuous application of the adhesive material in accordance with some examples of the present disclosure promotes die adhesion and/or provides mechanical stability of a resultant printbar module employing the same, among other advantages. 
     While  FIG. 2  illustrates the adhesive material  215  on the bottom surface  219  of the recess  217  the present disclosure is not so limited. Rather, the adhesive material  215  can, advantageously be located on the bottom surface  219  of the recess  217  and at least a portion of a side surface (e.g., side surface  523  as illustrated in  FIG. 5 ) the printhead die sliver  212 , among other locations to promote formation of the printbar modules  236 . In some examples, the adhesive material  215  can include adhesive material disposed on a surface (e.g., side surface  927  as illustrated in  FIG. 9 ) of the dam  221  surrounding the recess  217 . Such application can promote at least a portion of a side surface of the printhead die sliver  212  having adhesive material  215  disposed therein, but is not vital to effectuate the same. The adhesive material  215  disposed on the surface of the dam  221  surrounding the recess  217  can be the same type of adhesive material  215  and/or can applied utilizing the same types of methods associated with applying adhesive material  215  to the bottom surface  219  of the PCB  214 , as described herein. 
     The conductive elements  213  of the PCB  214  can be coupled, for example by wire bonds  222 , to electrical circuits included in a printhead die structure (not shown), as described herein. Conductive elements  213  are analogous to conductive elements  313 ,  413 ,  513 ,  613 ,  713 , and  813  as illustrated in  FIG. 3 ,  FIG. 4 ,  FIG. 5 ,  FIG. 6 ,  FIG. 7 , and  FIG. 8 , respectively, similar to the other elements of  FIG. 2  and their respective analogous elements in  FIGS. 3-8 . 
     A molding  224  can encapsulate the wire bonds  222 , the PCB  214 , and/or the printhead die sliver  212 . The molding  224  refers to a material that can protect the wire bonds  222 , the PCB  214 , and/or the printhead die sliver  212 , such as an epoxy. Accordingly, such a molding can be applied and cured to protect the desired components. In some examples, the molding can be a monolithic molding compound, for instance, enabling multiple rows of printhead die slivers to be molded in a single, monolithic body on the PCB  214 . 
     The PCB  214  includes a slot  216  form therein that extends through the PCB and an adhesive material  215  to the printhead die sliver  212 . The slot  216  is not prefabricated and again advantageously promotes printhead die sliver  212  positioning and/or printhead die sliver adhesion, among other advantages. Formation of the slot is described in greater detail herein with respect to  FIG. 8  and with respect to  FIG. 11 . 
       FIGS. 3  is a section view illustrating an example of a stage in a process of forming a printbar according to the present disclosure, for example, after providing a PCB as described with respect to  FIG. 11 . The PCB  314  can include a plurality of recesses, such as recess  317 , extending partially through the PCB and/or a plurality of dams, such as dam  321 , surrounding the plurality of recesses (e.g., as illustrated in  FIG. 9 ). The recess  317  can includes a bottom surface  319 . 
       FIG. 4  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 3  in a process of forming the printbar according to the present disclosure, for example, after applying an adhesive material to the PCB as described with respect to  FIG. 11 . In some examples, applying adhesive material  415  to the PCB  414  can include applying adhesive material  415  only to each of the plurality of recesses of the PCB. For example, adhesive material  415  can be applied only to a bottom surface  419  and/or side surfaces (e.g., side surface  27  as illustrated in  FIG. 9 ) of a dam  21  that form edges of the recess  17 . 
       FIG. 5  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 4  in a process of forming the printbar according to the present disclosure, for example, after positioning a die sliver in the recess as described with respect to  FIG. 11 . As illustrated in  FIG. 5 , printhead die sliver  512  can be positioned in an adhesive material  515  located on a bottom surface  519  of the recess having a dam  521  surrounding some/all of the recess. In some, examples the adhesive material can be applied to a side surface  523  of the printhead die sliver  512 , as described herein. 
       FIG. 6  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 5  in a process of forming the printbar according to the present disclosure, for example, after bonding a die sliver with a PCB as described with respect to  FIG. 11 . Bonding, as described herein, can include forming wire bonds  622  coupling conductive elements of the PCB  614  to conductive elements (not shown) of the printhead die sliver  612 .  FIG. 7  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 6  in a process of forming the printbar according to the present disclosure, for example, after encapsulating a die sliver and/or a PCB with a molding as described with respect to  FIG. 11 . That is, molding  712  can, for example, encapsulate a printhead die sliver  712 , wire bonds  722 , and/or a PCB  714 . 
       FIG. 8  is a section view illustrating an example of a stage subsequent to the stage illustrated in  FIG. 7  in a process of forming the printbar according to the present disclosure, for example, after forming a slot extending through a PCB and an adhesive material (e.g., a portion of the adhesive material) to a printhead die sliver as described with respect to  FIG. 11 . Thus, while the formation of a single printhead die and slot, such as printhead die sliver  812  and slot  816 , is shown in  FIGS. 3-8 , multiple printbar modules including multiple printhead die slivers and multiple slots can be formed, for example, as described with respect to  FIG. 11 . As illustrated in  FIG. 8 , a slot  816  can be formed through the PCB  814  and the adhesive material  815  such that the slot  816  is in fluidic communication with an ink feed hole  825  included in the printhead die sliver  812 . The slot can be formed using various techniques, such as laser etching, plunge-cut saw, and the like 
       FIG. 9  is a plan view illustrating an example of a printbar according to the present disclosure. PCB  914  can include a plurality of recesses including recess  917 . The recesses can be arranged in an end in a staggered configuration, among other possible configurations. The recess can include side surfaces, such as side surface  927 . That is, each of the recesses includes side surfaces, such as side surface  927 . In some examples, an amount of adhesive material can be applied to a side surface  927  of dam  921 . Side surface  927  can be flat, concave, or convex, among other possible shapes. An amount of adhesive material (not shown) sufficient to attach a side surface (e.g., side surface  523 ) of the printhead die to a side surface  927  of the dam  921  can, in some examples, be applied to the side surface  927 . Advantageously, a resultant amount of adhesive material can be located between a side surface of the printhead die sliver and the side surface  927  of the dam  921  to promote printhead die sliver adhesion to a PCB  914  including the dam  921 . 
       FIG. 10  is a plan view illustrating an example of a printbar according to the present disclosure. Printheads  1037  in PCB  1014 , as illustrated in  FIG. 10  can be arranged in an end to end in rows  1048  in a staggered configuration in which the printheads in each row overlap another printhead in that row, among other possible configurations. 
     Referring to  FIG. 10 , in the example shown, each printhead  1037  can include a pair of printhead dies slivers  1012  each with two rows of ejection chambers (not shown) and corresponding orifices (not shown) through which printing fluid is ejected from the ejection chambers. Each slot form in the PCB  1014 , as described herein, supplies printing fluid to one printhead die sliver  1012 . However, other suitable configurations of printhead  1037  are possible. For example, more or fewer printhead dies  1012  may be used with more or fewer ejection chambers and/or slots. 
     Printing fluid flows into each ejection chamber from a manifold extending lengthwise along each printhead die, for example, between the two rows of ejection chambers. Printing fluid feeds into manifold through multiple ports that are connected to a slot at printhead die surface. Slot is substantially wider (at least twice as wide as) than printing fluid ports that carry printing fluid from larger, loosely spaced passages in and/or to the flow regulators or other parts that carry printing fluid into printbar to the smaller, tightly spaced printing fluid ports in printhead die. Thus, slot can help reduce or even eliminate a discrete “fan-out” and other fluid routing structures. That is, a separate fluidic fan-out structure is not included between the manifold and the printhead die slivers. In addition, exposing a substantial area of printhead die sliver surface (e.g., an ink feed hole) directly to slot allows printing fluid in slot to help cool printhead die sliver during printing. 
     An actual printhead die sliver is typically a complex integrated circuit (IC) structure formed on a silicon substrate (not shown) with layers and elements not shown in  FIGS. 1-11 . For example, a thermal ejector element or a piezoelectric ejector element (not shown) formed on the substrate at each ejection chamber (not shown) included in the printhead die sliver  12  is actuated to eject drops or streams of ink or other printing fluid from orifices (not shown). 
     While  FIGS. 9 and 10  illustrate three staggered recesses, other suitable configurations are possible. For example, more or fewer printhead recesses may be used and/or the layout of the recesses may be altered. Similarly the shape, while illustrated as rectangular in nature, may be altered, for instance, depending upon the shape/size of a printhead die sliver and /or desired printbar module. 
     With regard to  FIG. 10 , although four rows  1048  of staggered printheads  1037  are shown, for printing four different colors for example, other suitable configurations are possible. For example,  FIG. 10  shows a plan view of a printbar  1036  having staggered groups of printheads  1037  in the recesses of the PCB  14 . Each of the groups includes four printheads  1037  by way of example, although a group can have more or less printheads. 
       FIG. 11  is a flow diagram of an example of a process of forming a printbar according to the present disclosure. As shown at  1190 , the method can include providing a PCB including a plurality of recesses extending partially through the PCB and a plurality of dams surrounding the plurality of recesses. For example, providing can include forming the plurality of recesses and/or the plurality of dams in the PCB. However, the PCB can include prefabricated recesses and/or dams. For example, a PCB including prefabricated recesses extending partially through the PCB and/or dams surrounding at least a portion of the recesses can be provided. Such a PCB, recesses, and/or dams can be analogous to the PCB as described with respect to  FIGS. 1-10 . 
     Adhesive material can be applied to the PCB. For instance, the method can include applying an adhesive material to each of the plurality of recesses, as shown at  1191 . Examples of the adhesive material include a flowable thermoset epoxy, among other adhesive materials suitable for application and printhead modules, as described herein. The adhesive material is applied to provide permanent adhesion of the die slivers to the PCB, as opposed to temporary adhesive material(s)/temporary adhesive products, for instance, temporary adhesion associated with thermal release tape and/or ultraviolet release tape, among other temporary adhesives materials and/or products utilizing temporary adhesive materials. 
     In some examples, the adhesive material is applied on both a bottom surface of the recess and/or side surfaces of a dam (e.g., surfaces of the adhesive material in contact with a side surface of the dam), such that, the adhesive material can attach a printhead die sliver to the PCB. For example, the adhesive material can be applied (e.g., continuously applied) to a bottom surface of each of the plurality of recesses and/or applied to a side surface (e.g., side surface as illustrated in  FIG. 9 ) of the dam adjacent the plurality of recesses. In some examples, an amount of adhesive material sufficient to enable the adhesive material to attach to a side surface of the printhead die and/or a side surface of the dam can be applied. 
     The adhesive material can be applied to the plurality of recesses and/or applied to a side surfaces of the dam using various techniques such as adhesive material stamping, stencil printing, and/or pin transfer, among other suitable techniques to apply the adhesive material as described herein. In some examples, applying adhesive material to the PCB includes applying adhesive material only to each of the plurality of recesses of the PCB. Such limited application can promote die positioning and/or provide a comparative reduction in cost associated with adhesive application (e.g., compared to coating the entire PCB), among other advantages. The adhesive material can be applied in a thickness and/or pattern suitable to promote positioning of the printhead die slivers. 
     For example, the method can include positioning a plurality of printhead die slivers in the plurality of recesses, as illustrated at  1192 . Positioning can, in some examples, positioning the plurality of printhead die slivers within an adhesive material, such as adhesive material applied at  1191 . The plurality of die slivers can be positioned with an orifice side facing down (towards a bottom surface of a recess) in the plurality of recesses. One of more of the plurality of die slivers can be positioned with each of the plurality of recesses. In some examples, a single die sliver of the plurality of die slivers is positioned within a single recess of the plurality of recesses. In this manner, a total number of the die slivers positioned in the recesses can equal a total number of the plurality of recesses. However, other positioning arrangements and/or total number of the plurality of printhead die slivers relative to a total number of the plurality of recesses are possible depending upon a desired type/performance of a resultant printbar module. 
     As illustrated at  1193  the method can include bonding the plurality of printhead die slivers with the PCB. For instance, the plurality of printhead die slivers positioned in the plurality of recesses, as illustrated at  1192 , can be bonded to the PCB. Bonding can, in some examples, include wire bonds coupling conductive elements, such as conductive elements, of the PCB to conductive elements of the printhead die slivers. Wire bonds can include gold and/or copper bonds, among other suitable materials for forming wire bonds, for example, ball bond or wedge bonds coupling conductive elements of the PCB to conductive elements of the printhead die slivers. 
     The method can include encapsulating the plurality of printhead die slivers and/or the PCB with a molding, as illustrated at  1194 . The mold can partially and/or completely encapsulate the plurality of printhead die slivers. For example, the plurality of printhead die slivers and/or the PCB can be encapsulated with a molding in response to bonding the plurality of printhead die slivers with the PCB. Encapsulating can include dispensing a liquid encapsulate material (e.g., an epoxy and/or an epoxy-based encapsulate material) over the printhead die slivers and/or and the wire bonds. In some examples, encapsulating can planarize the printhead die sliver, for instance, making a top surface of the printhead die sliver (e.g., a top surface of the molding located above a top surface of the printhead die sliver) co-planar with a top surface of a dam. 
     In response to encapsulating, for example, such as described with respect to  1194 , the method can include forming a plurality of slots, extending through the PCB and the adhesive material, as illustrated at  1195 . That is, the plurality of slots is formed after completion of encapsulating, as described herein. In various examples, encapsulating can include where the plurality of slots are in fluidic communication with fluid (e.g., ink) feed holes of the plurality of printhead die slivers to provide direct fluidic communication without fan-out, as described herein. 
     The adhesive material can remain on the bottom surface of the recess and a bottom surface of each of the plurality of printhead die slivers and/or between a side surface of the plurality of die slivers and a side surface(s) of a dam(s), such as dam. For instance, in some examples, forming can include forming the plurality of slots such that a portion of the adhesive material remains between the bottom surface  19  of the recess and a bottom surface of each of the plurality of printhead die slivers. 
     In some examples, forming includes forming the plurality of slots using a plunge-cut saw. However, the present disclosure is not so limited. That is, forming the plurality of slots, analogous or similar to slot  16 , as described herein, can employ suitable chemical (e.g., chemical etching, etc.) and/or mechanical (e.g., drill, sand-blasting, laser, etc.) methods to form the plurality of slots. 
     The plurality of die slivers including printhead die sliver are not part of a single semiconductor substrate, but rather are formed from separate semiconductor substrates (note that the plurality of slivers can be formed on a single PCB and then singulated during manufacture to be assembled as part of printer). For example, the separate printhead die slivers can be positioned to provide an appropriate ink slot pitch that cooperates with a manifold (not shown) to receive the ink. 
     In an example, a width of each die sliver can be substantially narrower than a spacing between die slivers. Further, the thickness of each die sliver can be substantially thinner than a thickness of the PCB and/or a molding. In a non-limiting example, each die sliver is less than or equal to 300 micrometers. It is to be understood that the die slivers can have other thickness more than 300 micrometers. 
     As used in this document, a “micro device” means a device having at least one exterior dimensions less than or equal to 30 mm; “thin” means a thickness less than or equal to 650 μm; a “sliver” means a thin micro device having a ratio of length to width (L/W) of at least three; a “printhead” and a “printhead die” mean that part of an inkjet printer or other inkjet type dispenser that dispenses fluid from at least one openings. A printhead includes at least one printhead dies. “Printhead” and “printhead die sliver” are not limited to printing with ink and other printing fluids but also include inkjet type dispensing of other fluids and/or for uses other than printing. The terms “printbar” and “printbar module” as used herein is meant to encompass various print structures, such as page-wide modules, integrated printhead/containers, individual ink cartridges, and the like. While the present disclosures describes “ink” by way of example, it is to be understood that “fluid” can be used in place of “ink” wherever “ink” is specifically recited. 
     The specification examples provide a description of the applications and use of the system and method of the present disclosure. Since many examples can be made without departing from the spirit and scope of the system and method of the present disclosure, this specification sets forth some of the many possible example configurations and implementations. With regard to the figures, the same part numbers designate the same or similar parts throughout the figures. The figures are not necessarily to scale. The relative size of some parts is exaggerated to more clearly illustrate the example shown.