WO2001066355A1 - Thermal expansion compensation for printhead assemblies - Google Patents

Thermal expansion compensation for printhead assemblies Download PDF

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Publication number
WO2001066355A1
WO2001066355A1 PCT/AU2001/000239 AU0100239W WO0166355A1 WO 2001066355 A1 WO2001066355 A1 WO 2001066355A1 AU 0100239 W AU0100239 W AU 0100239W WO 0166355 A1 WO0166355 A1 WO 0166355A1
Authority
WO
WIPO (PCT)
Prior art keywords
printhead
support member
thermal expansion
pct
printhead assembly
Prior art date
Application number
PCT/AU2001/000239
Other languages
French (fr)
Inventor
Kia Silverbrook
Original Assignee
Silverbrook Research Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE60141745T priority Critical patent/DE60141745D1/en
Priority to EP20010909351 priority patent/EP1274583B1/en
Priority to AT01909351T priority patent/ATE463347T1/en
Priority to AU2001237148A priority patent/AU2001237148B2/en
Priority to AU3714801A priority patent/AU3714801A/en
Priority to JP2001565187A priority patent/JP2003525784A/en
Priority to US10/129,503 priority patent/US6676245B2/en
Application filed by Silverbrook Research Pty Ltd filed Critical Silverbrook Research Pty Ltd
Publication of WO2001066355A1 publication Critical patent/WO2001066355A1/en
Priority to US10/882,770 priority patent/US6938983B2/en
Priority to US10/882,768 priority patent/US6959975B2/en
Priority to US10/882,765 priority patent/US6959974B2/en
Priority to US10/882,771 priority patent/US6935718B2/en
Priority to US10/882,769 priority patent/US7021740B2/en
Priority to US10/968,920 priority patent/US7029100B2/en
Priority to US11/144,803 priority patent/US7140718B2/en
Priority to US11/144,810 priority patent/US7246879B2/en
Priority to US11/144,808 priority patent/US7284824B2/en
Priority to US11/144,814 priority patent/US7010456B2/en
Priority to US11/144,809 priority patent/US7284825B2/en
Priority to US11/172,896 priority patent/US7284827B2/en
Priority to US11/250,451 priority patent/US7168796B2/en
Priority to US11/329,191 priority patent/US7152956B2/en
Priority to US11/330,054 priority patent/US7380912B2/en
Priority to US11/330,056 priority patent/US7133799B2/en
Priority to US11/540,575 priority patent/US7549724B2/en
Priority to US11/583,937 priority patent/US7467848B2/en
Priority to US11/592,207 priority patent/US7314266B2/en
Priority to US11/635,525 priority patent/US7537323B2/en
Priority to US11/764,778 priority patent/US7771013B2/en
Priority to US11/865,693 priority patent/US7549730B2/en
Priority to US11/869,684 priority patent/US7540591B2/en
Priority to US11/869,694 priority patent/US7854492B2/en
Priority to US11/951,121 priority patent/US7549725B2/en
Priority to US12/116,957 priority patent/US7469998B2/en
Priority to US12/273,523 priority patent/US7905575B2/en
Priority to US12/324,879 priority patent/US7686425B2/en
Priority to US12/433,901 priority patent/US7775644B2/en
Priority to US12/475,592 priority patent/US8029095B2/en
Priority to US12/850,612 priority patent/US8376515B2/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17513—Inner structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/1408—Structure dealing with thermal variations, e.g. cooling device, thermal coefficients of materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17553—Outer structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17559—Cartridge manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14362—Assembling elements of heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14419—Manifold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/08—Embodiments of or processes related to ink-jet heads dealing with thermal variations, e.g. cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/19—Assembling head units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/21—Line printing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49401—Fluid pattern dispersing device making, e.g., ink jet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12931—Co-, Fe-, or Ni-base components, alternative to each other
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24686—Pleats or otherwise parallel adjacent folds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249987—With nonvoid component of specified composition

Definitions

  • the present invention relates to printers, and in particular to digital inkjet printers.
  • PCT/AUOO/00578 PCT/AU00/00579 PCT/AU00/00581
  • PCT/AU00/00580 PCT/AU00/00582
  • PCT/AU0O/00587 PCT/AUOO/00588
  • PCT/AU00/00583 PCT/AU00/00593
  • PCT/AU00/0O590 PCT/AU00/00591
  • PCT/AU00/00592 PCT/AU00/00584
  • PCT/AUOO/00585 PCT/AU00/00586
  • PCT/AU00/00594 PCT/AU00/00595 PCT/AU00/00596 PCT/AU00/00597
  • PCT/AU00/00598 PCT/AU00/00516
  • PCT/AUOO/00517 PCT/AU00/00511
  • MEMS micro-electro mechanical system
  • p ⁇ nters have stationary p ⁇ ntheads that extend the width of the page to increase p ⁇ nting
  • the p ⁇ ntheads are made up of separate p ⁇ nthead modules mounted adjacent each other on a support beam in the pnnter To ensure
  • p ⁇ nthead may bow because of different thermal expansion characte ⁇ stics. Bowing across
  • the lateral dimension of the support beam does little to affect the operation of the p ⁇ nthead
  • the present invention provides a p ⁇ nthead assembly for a digital inkjet
  • the p ⁇ nthead assembly including a support member for attachment to the printer
  • a prmthead adapted for mounting to the support member
  • the support member having an outer shell and a core element defining at least one
  • the outer shell is formed from at least two different metals laminated
  • the printhead includes a silicon MEMS chip.
  • the support member is a beam and the core element is a plastic extrusion defining four separate
  • the metallic outer shell has an odd number
  • the printhead is a plurality of printhead modules positioned
  • Figure 1 is a schematic cross section of a printhead assembly according to the
  • the pnnthead assembly 1 includes a p ⁇ nthead 2 mounted to the pnnthead assembly 1 .
  • the support member 3 has an outer shell 4 and a core element 5
  • the outer shell 4 is a hot rolled tnlayer
  • the first metal layer 10 is sandwiched between layers of the second metal 11.
  • the metals forming the tnlayer shell are selected such that the
  • the effective coefficient can be made to match that of silicon by
  • the outer layers 11 are made of invar which has a coefficient of thermal
  • the p ⁇ nthead 2 includes a micro moulding 12 that is bonded to the core element 5
  • a silicon pnnthead chip 13 constructed using MEMS techniques provides the ink nozzles
  • the assembly will be minimized as it heats up to operational temperature. Accordingly, if the assembly includes a plurality of aligned p ⁇ nthead modules, the alignment between modules
  • the laminated structure of the outer shell is symmetrical in the sense that different metals are symmetrically disposed around a central

Abstract

A printhead assembly (1) for a digital inkjet printer, which has a support member (3) that can be secured in the printer, and a printhead (2) that can be mounted to the support member (3). The support member (3) defines at least one ink reservoir (6, 7, 8 and 9) in a core element (5) enclosed within a shell (4). The materials and structure of the shell (4) and the core (5) are selected and configured so that the co-efficient of thermal expansion of the support member (3) as a whole is substantially equal to that of the printhead (2).

Description

Title
Thermal Expansion Compensation for Prmthead Assemblies
Field of the Invention
The present invention relates to printers, and in particular to digital inkjet printers.
Co-Pending Applications
Various methods, systems and apparatus relating to the present invention are disclosed in the following co-pending applications filed by the applicant or assignee of the present invention on 24 May 2000:
PCT/AUOO/00578 PCT/AU00/00579 PCT/AU00/00581 PCT/AU00/00580 PCT/AU00/00582 PCT/AU0O/00587 PCT/AUOO/00588 PCT/AU00/00589
PCT/AU00/00583 PCT/AU00/00593 PCT/AU00/0O590 PCT/AU00/00591
PCT/AU00/00592 PCT/AU00/00584 PCT/AUOO/00585 PCT/AU00/00586
PCT/AU00/00594 PCT/AU00/00595 PCT/AU00/00596 PCT/AU00/00597
PCT/AU00/00598 PCT/AU00/00516 PCT/AUOO/00517 PCT/AU00/00511
Various methods, systems and apparatus relating to the present invention are disclosed in the following co-pending application, PCT/AUOO/01445 filed by the applicant
or assignee of the present invention on 27 November 2000. The disclosures of these co-
pending applications are incorporated herein by cross-reference. Also incorporated by cross-reference, is the disclosure of a co-filed PCT application, PCT/AUO 1/00238 (deriving
priority from Australian Provisional Patent Application No. PQ6059).
Background of the Invention
Recently, inkjet printers have been developed which use printheads manufactured by
micro-electro mechanical system(s) (MEMS) techniques. Such printheads have arrays of
microscopic ink ejector nozzles formed in a silicon chip using MEMS manufacturing
techniques. Pπntheads of this type are well suited for use in pagewidth pπnters. Pagewidth
pπnters have stationary pπntheads that extend the width of the page to increase pπnting
speeds. Pagewidth pπntheads do not traverse back and forth across the page like
conventional inkjet pπntheads, which allows the paper to be fed past the pπnthead more
quickly.
To reduce production and operating costs, the pπntheads are made up of separate pπnthead modules mounted adjacent each other on a support beam in the pnnter To ensure
that there are no gaps or overlaps in the pπnting produced by adjacent pπnthead modules it is necessary to accurately align the modules after they have been mounted to the support
beam. Once aligned, the pπnting from each module precisely abuts the pnnting from
adjacent modules.
Unfortunately, the alignment of the pπnthead modules at ambient temperature will
change when the support beam expands as it heats up duπng pπnthead operation.
Furthermore, if the pπnthead modules are accurately aligned when the support beam is at
the equi bπum operating temperature, there may be unacceptable misalignments in any
pπnting before the beam has reached the operating temperature. Even if the pnnthead is not
modulaπzed, thereby making the alignment problem irrelevant, the support beam and
pπnthead may bow because of different thermal expansion characteπstics. Bowing across
the lateral dimension of the support beam does little to affect the operation of the pπnthead
However, as the length of the beam is its major dimension, longitudinal bowing is more
significant and can affect pπnt quality
Summary of the Invention
Accordingly, the present invention provides a pπnthead assembly for a digital inkjet
pnnter, the pπnthead assembly including a support member for attachment to the printer;
a prmthead adapted for mounting to the support member;
the support member having an outer shell and a core element defining at least one
ink reservoir such that the effective coefficient of thermal expansion of the support member
is substantially equal to the coefficient of thermal expansion of the printhead.
Preferably, the outer shell is formed from at least two different metals laminated
together and the printhead includes a silicon MEMS chip. In a further prefeπed form, the support member is a beam and the core element is a plastic extrusion defining four separate
ink reservoirs. In a particularly preferred form, the metallic outer shell has an odd number
of longitudinally extending layers of at least two different metals, wherein layers of the
same metal are symmetrically disposed about the central layer.
It will be appreciated that by laminating layers of uniform thickness of the same
material on opposite sides of the central layer, and at equal distances therefrom, there is no
tendency for the shell to bow because of a dominating effect from any of the layers.
However, if desired, bowing can also be eliminated by careful design of the shells cross
section and variation of the individual layer thicknesses.
In some embodiments, the printhead is a plurality of printhead modules positioned
end to end along the beam.
Brief Description of the Drawing. A prefeπed embodiment of the invention will now be described, by way of example
only, with reference to the accompanying drawing in which:
Figure 1 is a schematic cross section of a printhead assembly according to the
present invention. Detailed Description of the Preferred Embodiments.
Referring to the figure, the pnnthead assembly 1 includes a pπnthead 2 mounted to
a support member 3. The support member 3 has an outer shell 4 and a core element 5
defining four separate mk reservoirs 6, 7, 8 and 9. The outer shell 4 is a hot rolled tnlayer
laminate of two different metals. The first metal layer 10 is sandwiched between layers of the second metal 11. The metals forming the tnlayer shell are selected such that the
effective coefficient of thermal expansion of the shell as a whole is substantially equal to that of silicon even though the coefficients of the core and the individual metals may
significantly differ from that of silicon Provided that the core or one of the metals has a
coefficient of thermal expansion greater than that of silicon, and another has a coefficient
less than that of silicon, the effective coefficient can be made to match that of silicon by
using different layer thicknesses in the laminate.
Typically, the outer layers 11 are made of invar which has a coefficient of thermal
expansion of 1.3 x 10 6 m/°C. The coefficient of thermal expansion of silicon is about 2 5 x
10"6 m/°C and therefore the central layer must have a coefficient greater than this to give the support beam an overall effective coefficient substantially the same as silicon
The pπnthead 2 includes a micro moulding 12 that is bonded to the core element 5
A silicon pnnthead chip 13 constructed using MEMS techniques provides the ink nozzles,
chambers and actuators.
As the effective coefficient of thermal expansion of the support beam is
substantially equal to that of the silicon pπnthead chip, the distortions in the pπnthead
assembly will be minimized as it heats up to operational temperature. Accordingly, if the assembly includes a plurality of aligned pπnthead modules, the alignment between modules
will not change significantly Furthermore, as the laminated structure of the outer shell is symmetrical in the sense that different metals are symmetrically disposed around a central
layer, there is no tendency of the shell to bow because of greater expansion or contraction of
any one metal in the laminar structure. Of course, a non-symmetrical laminar structure
could also be prevented from bowing by careful design of the lateral cross section of the
shell.
The invention has been described herein by way of example only. Skilled workers
in this field will readily recognise that the invention may be embodied in many other forms.

Claims

CLAIMS:-
1. A printhead assembly for a digital inkjet printer, the printhead assembly including: a support member for attachment to the printer;
a printhead adapted for mounting to the support member;
a support member having an outer shell and a core element defining at least one ink reservoir such that the effective coefficient of thermal expansion of the support member is
substantially equal to the coefficient of thermal expansion of the printhead.
2. A printhead assembly according to claim 1, wherein the outer shell is formed from
at least two metals laminated together and the printhead includes a silicon MEMS chip.
3. A printhead assembly according to claim 1 or claim 2, wherein the support member
is a beam and the core element is a plastic extrusion defining four separate ink reservoirs.
4. A printhead assembly according to claim 3, wherein the metallic outer shell has an
odd number of longitudinally extending layers of at least two different metals wherein
layers of the same metal are symmetrically disposed about the central layer.
5. A printhead assembly according to claim 4, wherein the printhead is a plurality of
printhead modules positioned end to end along the beam.
PCT/AU2001/000239 2000-03-06 2001-03-06 Thermal expansion compensation for printhead assemblies WO2001066355A1 (en)

Priority Applications (38)

Application Number Priority Date Filing Date Title
DE60141745T DE60141745D1 (en) 2000-03-06 2001-03-06 COMPENSATION OF THERMAL EXPANSION FOR PRESSURE HEAD CIRCUITS
EP20010909351 EP1274583B1 (en) 2000-03-06 2001-03-06 Thermal expansion compensation for printhead assemblies
AT01909351T ATE463347T1 (en) 2000-03-06 2001-03-06 COMPENSATING THERMAL EXPANSION FOR PRINTHEAD ASSEMBLIES
AU2001237148A AU2001237148B2 (en) 2000-03-06 2001-03-06 Thermal expansion compensation for printhead assemblies
AU3714801A AU3714801A (en) 2000-03-06 2001-03-06 Thermal expansion compensation for printhead assemblies
JP2001565187A JP2003525784A (en) 2000-03-06 2001-03-06 Thermal expansion compensation for printhead assemblies
US10/129,503 US6676245B2 (en) 2000-03-06 2001-03-06 Thermal expansion compensation for printhead assemblies
US10/882,769 US7021740B2 (en) 2000-03-06 2004-07-02 Assembly for a pagewidth printhead
US10/882,768 US6959975B2 (en) 2000-03-06 2004-07-02 Printhead assembly for a pagewidth printer
US10/882,770 US6938983B2 (en) 2000-03-06 2004-07-02 Support member with core and shell
US10/882,765 US6959974B2 (en) 2000-03-06 2004-07-02 Pagewidth printhead assembly
US10/882,771 US6935718B2 (en) 2000-03-06 2004-07-02 Support member for a printhead
US10/968,920 US7029100B2 (en) 2000-03-06 2004-10-21 Stable support arrangement for printhead
US11/144,803 US7140718B2 (en) 2000-03-06 2005-06-06 Inkjet printer with a pagewidth printhead assembly
US11/144,810 US7246879B2 (en) 2000-03-06 2005-06-06 Thermally stable pagewidth printhead assembly
US11/144,808 US7284824B2 (en) 2000-03-06 2005-06-06 Printhead assembly with support member for pagewidth printhead
US11/144,814 US7010456B2 (en) 2000-03-06 2005-06-06 Printhead assembly with support shell for pagewidth printhead
US11/144,809 US7284825B2 (en) 2000-03-06 2005-06-06 Pagewidth printhead assembly having aligned printhead modules
US11/172,896 US7284827B2 (en) 2000-03-06 2005-07-05 Printer including support member for supporting modular pagewidth printhead
US11/250,451 US7168796B2 (en) 2000-03-06 2005-10-17 Printhead assembly with thermal equalization characteristics
US11/329,191 US7152956B2 (en) 2000-03-06 2006-01-11 Inkjet printhead assembly with a thermal expansion equalization mechanism
US11/330,056 US7133799B2 (en) 2000-03-06 2006-01-12 Printhead assembly with composite support beam for a pagewidth printhead
US11/330,054 US7380912B2 (en) 2000-03-06 2006-01-12 Inkjet printer having stably mounted printhead
US11/540,575 US7549724B2 (en) 2000-03-06 2006-10-02 Printhead assembly with multi-layered support structure
US11/583,937 US7467848B2 (en) 2000-03-06 2006-10-20 Inkjet printhead assembly with an ink reservoir in a multi-layered shell
US11/592,207 US7314266B2 (en) 2000-03-06 2006-11-03 Inkjet printhead assembly with an ink distribution molding
US11/635,525 US7537323B2 (en) 2000-03-06 2006-12-08 Printhead assembly with an ink distribution molding and a composite IC carrier
US11/764,778 US7771013B2 (en) 2000-03-06 2007-06-18 Thermally stable pagewidth printhead assembly incorporating a laminated structure
US11/865,693 US7549730B2 (en) 2000-03-06 2007-10-01 Printhead assembly incorporating a tri-layer laminate shell
US11/869,684 US7540591B2 (en) 2000-03-06 2007-10-09 Printhead assembly with laminar printhead support member
US11/869,694 US7854492B2 (en) 2000-03-06 2007-10-09 Pagewidth printhead assembly with support member laminate structure
US11/951,121 US7549725B2 (en) 2000-03-06 2007-12-05 Ink reservoir assembly for a pagewidth printhead
US12/116,957 US7469998B2 (en) 2000-03-06 2008-05-08 Printhead assembly having a tri-layer outer shell of a hot rolled laminate of two different metals
US12/273,523 US7905575B2 (en) 2000-03-06 2008-11-18 Inkjet printhead assembly
US12/324,879 US7686425B2 (en) 2000-03-06 2008-11-27 Printhead assembly with symmetrical tri-layer outer shell laminate
US12/433,901 US7775644B2 (en) 2000-03-06 2009-05-01 Printhead assembly with an ink supply carrier supporting an ink distributing molding
US12/475,592 US8029095B2 (en) 2000-03-06 2009-05-31 Pagewidth printhead with ink supply reservoirs integrated into support member
US12/850,612 US8376515B2 (en) 2000-03-06 2010-08-04 Pagewidth printhead assembly incorporating laminated support structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ6058 2000-03-06
AUPQ6058A AUPQ605800A0 (en) 2000-03-06 2000-03-06 Printehead assembly

Related Child Applications (9)

Application Number Title Priority Date Filing Date
US10129503 A-371-Of-International 2000-03-06
US10/129,503 A-371-Of-International US6676245B2 (en) 2000-03-06 2001-03-06 Thermal expansion compensation for printhead assemblies
US10129503 A-371-Of-International 2001-03-06
US10/173,064 Continuation US20030223633A1 (en) 2000-03-06 2002-06-17 Method and system for compressing digital images
US10/713,089 Continuation US6799836B2 (en) 2000-03-06 2003-11-17 Printhead assembly with core and shell
US10/713,067 Continuation US6942319B2 (en) 2000-03-06 2003-11-17 Stable printhead assembly
US10/713,090 Continuation US7029097B2 (en) 2000-03-06 2003-11-17 Pagewidth printhead assembly
US10/713,064 Continuation US7048352B2 (en) 2000-03-06 2003-11-17 Printhead supporting shell
US10/713,088 Continuation US6827427B2 (en) 2000-03-06 2003-11-17 Core for pagewidth printhead

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WO2001066355A1 true WO2001066355A1 (en) 2001-09-13

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US (38) US6676245B2 (en)
EP (1) EP1274583B1 (en)
JP (1) JP2003525784A (en)
AT (1) ATE463347T1 (en)
AU (1) AUPQ605800A0 (en)
DE (1) DE60141745D1 (en)
SG (1) SG128471A1 (en)
WO (1) WO2001066355A1 (en)

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US7168796B2 (en) 2007-01-30
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US20060114288A1 (en) 2006-06-01
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US7775644B2 (en) 2010-08-17
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US7854492B2 (en) 2010-12-21

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