CA2506701A1 - Thermal ink jet printhead with suspended beam heater - Google Patents

Thermal ink jet printhead with suspended beam heater Download PDF

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Publication number
CA2506701A1
CA2506701A1 CA002506701A CA2506701A CA2506701A1 CA 2506701 A1 CA2506701 A1 CA 2506701A1 CA 002506701 A CA002506701 A CA 002506701A CA 2506701 A CA2506701 A CA 2506701A CA 2506701 A1 CA2506701 A1 CA 2506701A1
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CA
Canada
Prior art keywords
heater element
printhead
bubble
liquid
nozzle
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002506701A
Other languages
French (fr)
Other versions
CA2506701C (en
Inventor
Kia Silverbrook
Angus John North
Gregory John Mcavoy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Memjet Technology Ltd
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2506701A1 publication Critical patent/CA2506701A1/en
Application granted granted Critical
Publication of CA2506701C publication Critical patent/CA2506701C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04518—Control methods or devices therefor, e.g. driver circuits, control circuits reducing costs
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    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/05—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers produced by the application of heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B82Y99/00—Subject matter not provided for in other groups of this subclass

Abstract

There is disclosed an ink jet printhead which comprises a plurality of nozzles (3) and one or more heater elements (10) corresponding to each nozzle. Each heater element is configured to heat a bubble (12) forming liquid in the printhead to a temperature above its boiling point to form a gas bubble therein. The generation of the bubble causes the ejection of a drop (16) of an ejectable liquid (such as ink) through respective corresponding nozzle, to effect printing. Each heater element is in the form of a beam suspended over at least a portion of the bubble forming liquid so as to be in thermal contact therewith. This configuration of printhead provides for a relatively high efficiency of operation.

Claims (47)

1. An ink jet printhead comprising:
a plurality of nozzles; and at least one respective heater element corresponding to each nozzle, wherein each heater element is in the form of a suspended beam, arranged for being suspended over at least a portion of a bubble forming liquid so as to be in thermal contact therewith, and each heater element is configured to heat at least part of the bubble forming liquid to a temperature above its boiling point to form a gas bubble therein, thereby to cause the ejection of a drop of an ejectable liquid through the nozzle corresponding to that heater element.
2. The printhead of claim 1 being configured to support the bubble forming liquid in thermal contact with each said heater element, and to support the ejectable liquid adjacent each nozzle.
3. The printhead of claim 1 wherein the bubble forming liquid and the ejectable liquid are of a common body of liquid.
4. The printhead of claim 1 being configured to print on a page and to be a page-width printhead.
5. The printhead of claim 1 wherein each heater element is in the form of a cantilever beam.
6. The printhead of claim 1 wherein each heater element is configured such that an actuation energy of less than 500 nanojoules (nJ) is required to be applied to that heater element to heat that heater element sufficiently to form a said bubble in the bubble forming liquid thereby to cause the ejection of a said drop.
7. The printhead of claim 1 configured to receive a supply of the ejectable liquid at an ambient temperature, wherein each heater element is configured such that the energy required to be applied thereto to heat said part to cause the ejection of a said drop is less than the energy required to heat a volume of said ejectable liquid equal to the volume of the said drop, from a temperature equal to said ambient temperature to said boiling point.
8. The printhead of claim 1 comprising a substrate having a substrate surface, wherein each nozzle has a nozzle aperture opening through the substrate surface, and wherein the areal density of the nozzles relative to the substrate surface exceeds 10,000 nozzles per square cm of substrate surface.
9. The printhead of claim 1 wherein each heater element has two opposite sides and is configured such that a said gas bubble formed by that heater element is formed at both of said sides of that heater element.
10. The printhead of claim 1 wherein the bubble which each element is configured to form is collapsible and has a point of collapse, and wherein each heater element is configured such that the point of collapse of a bubble formed thereby is spaced from that heater element.
11. The printhead of claim 1 comprising a structure that is formed by chemical vapor deposition (CVD), the nozzles being incorporated on the structure.
12. The printhead of claim 1 comprising a structure which is less than 10 microns thick, the nozzles being incorporated on the structure.
13. The printhead of claim 1 comprising a plurality of nozzle chambers each corresponding to a respective nozzle, and a plurality of said heater elements being disposed within each chamber, the heater elements within each chamber being formed on different respective layers to one another.
14. The printhead of claim 1 wherein each heater element is formed of solid material more than 90% of which, by atomic proportion, is constituted by at least one periodic element having an atomic number below 50.
15. The printhead of claim 1 wherein each heater element includes solid material and is configured for a mass of less than 10 nanograms of the solid material of that heater element to be heated to a temperature above said boiling point thereby to heat said part of the bubble forming liquid to a temperature above said boiling point to cause the ejection of a said drop.
16. The printhead of claim 1 wherein each heater element is substantially covered by a conformal protective coating, the coating of each heater element having been applied substantially to all sides of the heater element simultaneously such that the coating is seamless.
17. A printer system incorporating a printhead, the printhead comprising:
a plurality of nozzles; and at least one respective heater element corresponding to each nozzle, wherein each heater element is in the form of a suspended beam, arranged for being suspended over at least a portion of a bubble forming liquid so as to be in thermal contact therewith, and each heater element is configured to heat at least part of the bubble forming liquid to a temperature above its boiling point to form a gas bubble therein, thereby to cause the ejection of a drop of an ejectable liquid through the nozzle corresponding to that heater element.
18. The system of claim 17 being configured to support the bubble forming liquid in thermal contact with each said heater element, and to support the ejectable liquid adjacent each nozzle.
19. The system of claim 17 wherein the bubble forming liquid and the ejectable liquid are of a common body of liquid.
20. The system of claim 17 being configured to print on a page and to be a page-width printhead.
21. The system of claim 17 wherein each heater element is in the form of a cantilever beam.
22. The system of claim 17 wherein each heater element is configured such that an actuation energy of less than 500 nanojoules (nJ) is required to be applied to that heater element to heat that heater element sufficiently to form a said bubble in the bubble forming liquid thereby to cause the ejection of a said drop.
23. The system of claim 17, wherein the printhead is configured to receive a supply of the ejectable liquid at an ambient temperature, and wherein each heater element is configured such that the energy required to be applied thereto to heat said part to cause the ejection of a said drop is less than the energy required to heat a volume of said ejectable liquid equal to the volume of the said drop, from a temperature equal to said ambient temperature to said boiling point.
24. The system of claim 17 comprising a substrate having a substrate surface, wherein each nozzle has a nozzle aperture opening through the substrate surface, and wherein the areal density of the nozzles relative to the substrate surface exceeds 10,000 nozzles per square cm of substrate surface.
25. The system of claim 17 wherein each heater element has two opposite sides and is configured such that a said gas bubble formed by that heater element is formed at both of said sides of that heater element.
26. The system of claim 17 wherein the bubble which each element is configured to form is collapsible and has a point of collapse, and wherein each heater element is configured such that the point of collapse of a bubble formed thereby is spaced from that heater element.
27. The system of claim 17 comprising a structure that is formed by chemical vapor deposition (CVD), the nozzles being incorporated on the structure.
28. The system of claim 17 comprising a structure which is less than 10 microns thick, the nozzles being incorporated on the structure.
29. The system of claim 17 comprising a plurality of nozzle chambers each corresponding to a respective nozzle, and a plurality of said heater elements being disposed within each chamber, the heater elements within each chamber being formed on different respective layers to one another.
30. The system of claim 17 wherein each heater element is formed of solid material more than 90% of which, by atomic proportion, is constituted by at least one periodic element having an atomic number below 50.
31. The system of claim 17 wherein each heater element includes solid material and is configured for a mass of less than 10 nanograms of the solid material of that heater element to be heated to a temperature above said boiling point thereby to heat said part of the bubble forming liquid to a temperature above said boiling point to cause the ejection of a said drop.
32. The system of claim 17 wherein each heater element is substantially covered by a conformal protective coating, the coating of each heater element having been applied substantially to all sides of the heater element simultaneously such that the coating is seamless.
33. A method of ejecting a drop of an ejectable liquid from a printhead, the printhead comprising a plurality of nozzles and at least one respective heater element corresponding to each nozzle, the method comprising the steps of:
providing the printhead wherein each heater element is in the form of a suspended beam;
disposing a bubble forming liquid such that the heater elements are positioned above, and in thermal contact with, at least a portion of the bubble forming liquid;
heating at least one heater element corresponding to a said nozzle so as to heat at least some of said portion of the bubble forming liquid which is in thermal contact with the at least. one heated heater element to a temperature above the boiling point of the bubble forming liquid;
generating a gas bubble in the bubble forming liquid by said step of heating;
and causing the drop of ejectable liquid to be ejected through the nozzle corresponding to the at least one heated heater element by said step of generating a gas bubble.
34. The method of claim 33 comprising, before said step of heating, the steps of:
disposing the bubble forming liquid in thermal contact with the heater elements; and disposing the ejectable liquid adjacent the nozzles.
35. The method of claim 33 wherein the bubble forming liquid and the ejectable liquid are of a common body of liquid.
36. The method of claim 33 wherein the step of disposing the bubble forming liquid comprises disposing the bubble forming liquid so that it substantially surrounds the heater elements.
37. The method of claim 33 wherein said step of heating at least one heater element is effected by applying an actuation energy of less than 500nJ to each such heater element.
38. The method of claim 33, comprising, prior to the step of heating at least one heater element, the step of receiving a supply of the ejectable liquid, at an ambient temperature, to the printhead, wherein the step of heating is effected by applying heat energy to each such heater element, wherein said applied heat energy is less than the energy required to heat a volume of said ejectable liquid equal to the volume of said drop, from a temperature equal to said ambient temperature to said boiling point.
39. The method of claim 33 wherein, in said step of providing the printhead, the printhead includes a substrate on which said nozzles are disposed, the substrate having a substrate surface and the areal density of the nozzles relative to the substrate surface exceeding 10,000 nozzles per square cm of substrate surface.
40. The method of claim 33 wherein each heater element has two opposite sides and wherein, in the step of generating a gas bubble, the bubble is generated at both of said sides of each heated heater element.
41. The method of claim 33 wherein, in the step of generating a gas bubble, the generated bubble is collapsible and has a point of collapse, and is generated such that the point of collapse is spaced from the at least one heated heater element.
42. The method of claim 33 wherein the step of providing the printhead includes forming a structure by chemical vapor deposition (CVD), the structure incorporating the nozzles thereon.
43. The method of claim 33 wherein, in the step of providing the printhead, the printhead has a structure which is less than 10 microns thick and which incorporates said nozzles thereon.
44. The method of claim 33 wherein, in the step of providing the printhead, the printhead has a plurality of nozzle chambers each chamber corresponding to a respective nozzle and wherein the step of providing the printhead further includes forming a plurality of said heater elements in each chamber, such that the heater elements in each chamber are formed on different respective layers to one another.
45. The method of claim 33 wherein, in the step of providing the printhead, each heater element is formed of solid material more than 90% of which, by atomic proportion, is constituted by at least one periodic element having an atomic number below 50.
46. The method of claim 33 wherein, in the step of providing the printhead, each heater element includes solid material and wherein the step of heating at least one heater element comprises heating a mass of less than 10 nanograms of the solid material of each such heater element to a temperature above said boiling point.
47. The method of claim 33 wherein the step of providing the printhead includes applying to each heater element, substantially to all sides thereof simultaneously, a conformal protective coating such that the coating is seamless.
CA2506701A 2002-11-23 2003-11-17 Thermal ink jet printhead with suspended beam heater Expired - Lifetime CA2506701C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/302,274 2002-11-23
US10/302,274 US6755509B2 (en) 2002-11-23 2002-11-23 Thermal ink jet printhead with suspended beam heater
PCT/AU2003/001506 WO2004048102A1 (en) 2002-11-23 2003-11-17 Thermal ink jet printhead with suspended beam heater

Publications (2)

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CA2506701A1 true CA2506701A1 (en) 2004-06-10
CA2506701C CA2506701C (en) 2010-10-05

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US (115) US6755509B2 (en)
EP (1) EP1565318B1 (en)
JP (1) JP4286784B2 (en)
KR (1) KR20050086689A (en)
CN (1) CN100386204C (en)
AT (1) ATE495897T1 (en)
AU (1) AU2003275792B2 (en)
CA (1) CA2506701C (en)
DE (1) DE60335820D1 (en)
DK (1) DK1565318T3 (en)
IL (1) IL168528A (en)
WO (1) WO2004048102A1 (en)

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