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EP-4739510-A1 - MOLDED BODY FOR FLUID EJECTION DEVICE ASSEMBLY

EP4739510A1EP 4739510 A1EP4739510 A1EP 4739510A1EP-4739510-A1

Abstract

A fluid ejection device assembly (100) may include a molded body (110) including multiple reservoirs (116a, 116b, 116c) to store print fluid, each reservoir connected to a fluid ejection die (131a, 131b, 131c) through a fluidic path, where the fluidic path is formed by an output (119a, 119b, 119c) of the molded body and an input of a fluidic structure (120) supporting the fluidic ejection dies. The outputs of the molded body may be connected to the corresponding inputs of the fluidic structure by fluidic joints. The molded body may include a support (112) to support a flexible circuit (140) attached to the molded body.

Inventors

  • STUDER, ANTHONY D.
  • BELL, JEFFREY F.
  • QUINN, MAX
  • LEISER, JUDSON M.
  • ENDER, RONALD J.

Assignees

  • Hewlett-Packard Development Company, L.P.

Dates

Publication Date
20260513
Application Date
20230703

Claims (20)

  1. 1. A molded body for a fluid ejection device assembly, the molded body comprising: a first reservoir to store first print fluid; a first output to form a first fluidic path downstream of the first reservoir, the first fluidic path to deliver the first print fluid from the first reservoir to a first nozzle array; a second reservoir to store second print fluid; and a second output to form a second fluidic path downstream of the second reservoir, the second fluidic path to deliver the second print fluid from the second reservoir to a second nozzle array, wherein a first surrounding border surrounding the first fluidic path is separate from a second surrounding border surrounding the second fluidic path.
  2. 2. The molded body of claim 1, wherein a first wall of the first surrounding border does not contact a second wall of the second surrounding border.
  3. 3. The molded body of claim 1 or claim 2, wherein the first and second surrounding borders are fluidic joints to adhere the molded body to a fluidic structure, wherein the fluidic structure is to support, or supports, a fluidic ejection device including the nozzle arrays.
  4. 4. The molded body of any preceding claim, further comprising a first reservoir pocket and a second reservoir pocket, wherein the molded body includes a recess between the first reservoir pocket and the second reservoir pocket, wherein the first and second outputs are provided in the recess.
  5. 5. The molded body of any preceding claim, wherein the first and second surrounding borders include one or more rounded portions.
  6. 6. A molded body for a fluid ejection device assembly, the molded body comprising: a reservoir to store print fluid; an output to form a fluidic path downstream of the reservoir, the fluidic path to deliver the print fluid from the reservoir to a nozzle array; and a support protruding from an external wall of the body, near a bottom of the reservoir to support a flexible circuit attached to the molded body and connected to a fluid ejection device of the fluid ejection device assembly.
  7. 7. The molded body of claim 6, further comprising: a first reservoir pocket; and a second reservoir pocket, wherein the pockets are internally open to the reservoir, and the molded body includes a recess between the first pocket and the second pocket, wherein the support is provided in or near the recess to support the flexible circuit in the recess.
  8. 8. The molded body of claim 6 or 7, wherein the support is pillar-shaped.
  9. 9. The molded body of any of claims 6-8, wherein the support includes an edge parallel to a face of the molded body to which the flexible circuit is attached, wherein the flexible circuit bends over the edge to attach to the face of the molded body.
  10. 10. The molded body of any of claims 6-9, further comprising a second support configured to support a fluidic structure assembly, the fluidic structure assembly including the fluid ejection device and the flexible circuit, wherein the flexible circuit contacts the second support in an installed state.
  11. 11. A fluidic structure for a fluid ejection device, the fluidic structure comprising: a first fluidic path to deliver a first print fluid from a first reservoir chamber to a first nozzle array; a first input of the first fluidic path, a second fluidic path to deliver a second print fluid from a second reservoir chamber to a second nozzle array; and a second input of the second fluidic path, wherein the first and second fluidic paths are physically discrete fluidic paths.
  12. 12. The fluidic structure of claim 11, wherein a first surrounding border surrounding the first input is detached from a second surrounding border surrounding the second input.
  13. 13. The fluidic structure of claim 11 or claim 12, wherein a first external wall of the first surrounding border does not contact a second external wall of the second surrounding border.
  14. 14. The fluidic structure of any of claims 11-13, further comprising a headland opposite from the inputs, and a fluid ejection device attached to the headland.
  15. 15. The fluidic structure of any of claims 11-14, wherein the first and second surrounding borders include one or more rounded portions.
  16. 16. The fluidic structure assembly comprising the fluidic structure of any of claims I lls, the assembly comprising a flexible circuit connected to a fluid ejection device, wherein the fluid ejection device includes the first nozzle array and the second nozzle array.
  17. 17. A fluid ejection device assembly for a replaceable fluid ejection cartridge comprising: a molded body comprising a reservoir and an open fluid output terminating at a fluidic output joint; and a molded fluidic structure, separate from the molded body, to support a fluid ejection device and deliver fluid from the reservoir to the fluid ejection device, wherein the fluidic structure comprises an open fluidic input terminating at a fluidic input joint corresponding to the fluidic output joint, such that the fluid output and fluid input form a fluidic path from the reservoir to the fluid ejection device.
  18. 18. The fluid ejection device assembly of claim 17, further comprising a support protruding from the molded body to support a flexible circuit connected to the molded body and the fluid ejection device.
  19. 19. The fluid ejection device assembly of claim 17 or claim 18, wherein the molded body comprises: multiple reservoir chambers to hold different fluid types; and a corresponding output and fluidic joint for each of the multiple reservoir chambers, wherein the fluidic structure comprises multiple corresponding inputs and fluidic joints to form fluidic paths to different longitudinal nozzle arrays for the different fluid types.
  20. 20. The fluid ejection device assembly of any of claims 17-19 wherein the fluidic input joint and the fluidic output joint are provided between pockets of the reservoir located below the main reservoir chambers.

Description

MOLDED BODY FOR FLUID EJECTION DEVICE ASSEMBLY BACKGROUND [0001] Inkjet printing involves depositing ink onto a surface, such as sheet of paper. Print fluid can be stored in a print fluid reservoir until it is used for printing. Print dies may dispense the print fluid for printing. BRIEF DESCRIPTION OF THE DRAWINGS [0002] FIG. 1 illustrates a perspective view of an example fluid ejection device assembly. [0003] FIG. 2 illustrates an exploded view of the fluid ejection device assembly of FIG. 1. [0004] FIG. 3 illustrates a cross-section view of the molded body of FIG. 1. [0005] FIG. 4 illustrates a perspective view of the molded body of FIG. 1. [0006] FIG. 5 illustrates a fluidic structure assembly including the fluidic structure, flexible circuit, and fluid ejection device of FIG. 1. [0007] FIG. 6 illustrates a perspective view of an example molded body of a fluid ejection device assembly. [0008] FIG. 7 illustrates an example fluidic structure assembly corresponding to the molded body of FIG. 6. [0009] FIG. 8 illustrates a perspective view of an example fluid ejection device assembly having a single fluid ejection die. [0010] FIG. 9 illustrates a perspective view of the molded body of FIG. 8. [0011] FIG. 10 illustrates a fluidic structure assembly including the fluidic structure, flexible circuit, and fluid ejection device of FIG. 8. [0012] FIG. 11 illustrates a top view of the fluid ejection device assembly of FIG. 8. [0013] FIG. 12 illustrates a cross-section of the fluid ejection device assembly of FIG. 11 along line A. [0014] FIG. 13 illustrates a close-up of a portion of FIG. 12. [0015] FIG. 14 illustrates a cross-section of the fluid ejection device assembly of FIG. 11 along line B. [0016] FIG. 15 illustrates a close-up of a portion of FIG. 14. [0017] FIG. 16 is a block diagram of an example molded body. [0018] FIG. 17 is a block diagram of an example molded body including a support to support a flexible circuit. [0019] FIG. 18 is a block diagram of a fluidic structure. [0020] FIG. 19 is a block diagram of an example fluid ejection device assembly. [0021] FIG. 20 is a block diagram of an example fluid ejection device assembly including a support to support a flexible circuit. [0022] The foregoing and other features of the present disclosure will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several examples in accordance with the disclosure and are therefore, not to be considered limiting of its scope, the disclosure will be described with additional specificity and detail through use of the accompanying drawings. DETAILED DESCRIPTION [0023] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative examples described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and made part of this disclosure. [0024] This disclosure relates to fluid ejection device assemblies. A fluid ejection device assembly may include a fluid ejection device for dispensing print fluid and a reservoir for storing the print fluid. The print fluid may include any 2D or 3D print agent including ink for printing on a medium such as paper (2D) or (e.g., powdered) build material (3D). The print fluid may include dispensable fluid to be dispensed at relatively high precision (as to volume and/or location) for fields of implementation other that 2D or 3D imaging, including but not limited to forensic, laboratory or pharmaceutical applications. [0025] FIG. 1 illustrates a perspective view of an example fluid ejection device assembly 100. The fluid ejection device assembly 100 includes a molded body 110. The molded body 110 may include reservoir chambers for storing print fluid. Separate reservoir chambers of the molded body 110 may store different types of print fluid. In an example, the molded body 110 includes three separate reservoir chambers for storing cyan, yellow, and magenta print fluid, respectively. The fluid ejection device assembly 100 may include a fluidic structure 120. The fluidic structure may be attached to the molded body 110. The fluidic structure 120 may be in a recess 109 of the molded body 110. The fluidic structure 120 may be attached to the molded body 110 to create a fluidic path from the reservoir chambers of the molded body 110 to a fluid ejection device 130. [0026