EP0749834B1 - Tête d'impression à jet d'encre avec composants de commande intégrés - Google Patents
Tête d'impression à jet d'encre avec composants de commande intégrés Download PDFInfo
- Publication number
- EP0749834B1 EP0749834B1 EP96109564A EP96109564A EP0749834B1 EP 0749834 B1 EP0749834 B1 EP 0749834B1 EP 96109564 A EP96109564 A EP 96109564A EP 96109564 A EP96109564 A EP 96109564A EP 0749834 B1 EP0749834 B1 EP 0749834B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resistor
- ink
- print head
- temperature
- mos transistor
- 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.)
- Expired - Lifetime
Links
- 239000000758 substrate Substances 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 13
- 238000007639 printing Methods 0.000 claims description 13
- 239000004065 semiconductor Substances 0.000 claims description 8
- 210000003127 knee Anatomy 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
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
- B41J2/015—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
- B41J2/04515—Control methods or devices therefor, e.g. driver circuits, control circuits preventing overheating
-
- 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
- B41J2/015—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
- B41J2/0454—Control methods or devices therefor, e.g. driver circuits, control circuits involving calculation of temperature
-
- 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
- B41J2/015—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
- B41J2/04541—Specific driving circuit
-
- 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
- B41J2/015—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
- B41J2/0458—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on heating elements forming bubbles
Definitions
- the present invention relates to a printhead used in equipment for forming black and colour images on a printing medium, generally though not exclusively a sheet of paper, with the thermal ink jet technology and, more particularly to a printhead with integrated driving components.
- a typical ink jet printer schematically comprises:
- the printheads also comprise integrated resistor drive components on the same semiconductor substrate.
- these electronic components are integrated MOS transistors, i.e. produced by the known semiconductor integrated-circuit technology techniques on the same silicon substrate, and selectively supply the energy for heating of the resistors. All the ejection resistors Ri are in turn connected to a voltage V power supply.
- these integrated driving components TRi all with essentially the same geometrical and electrical characteristics, and the relative ejection resistors Ri associated with them, are laid out in a matrix of rows and columns, according to methods of operation known in the art, in order to reduce the number of connections and contacts between them and electronic controller 101 to a minimum.
- the electronic controller 101 comprises row and column selection circuits for selectively sending commands to transistors TRi and Ti respectively.
- Fig. 1 illustrates, as a non-exhaustive example, the electric circuit of a printhead with 64 nozzles, containing 64 ejection resistors Ri laid out in a matrix of 8 rows by 8 columns, corresponding to which there are 64 MOS drive transistors TRi divided into 8 groups; each of these groups is in turn connected to earth through a MOS transistor Ti, which may have different geometrical and electrical characteristics from those of transistors TRi.
- Method of operation of head 100 is as follows: when the electronic controller 101 simultaneously activates, for example, the "rows 2 selection" command and the " columns 1 selection” command, transistors TR2 and T1 start to conduct. With these two transistors simultaneously conducting to earth, the current supplied by the voltage V power supply is enabled to flow through resistor R2; this current is converted into thermal energy by Joule effect in ejection resistor R2, causing the latter to heat very rapidly to a temperature in the region of 300 °C.
- a first portion of this thermal energy is transferred to the surrounding ink in contact with resistor R2, vaporising it and thus causing the ejection of a drop of given volume through the nozzle connected to the cell housing resistor R2; a second portion of the thermal energy is lost by conduction through the common substrate (the silicon wafer) on which the ejection resistors are deposited, increasing the temperature Ts of the substrate, of the head as a whole and of the ink it contains, with respect to the ambient temperature.
- the common substrate the silicon wafer
- this rise in temperature may be confined to the surrounding region of some of the ejection resistors of the head only, due to the fact that the current printing job may require preferential activation of some nozzles only, and the diffusion of heat by conduction in the substrate is not sufficiently rapid to obtain a uniform distribution of temperature.
- volume VOL of the droplets ejected increases in a way substantially proportional to the increase in energy E supplied to resistor Ri. Conversely, above the Eg value, volume VOL remains substantially unchanged for increases of the energy E supplied to resistor Ri.
- volume VOL of the ejected droplet does not remain constant but instead increases with the rise in temperature Ts of the substrate, mainly due variations in viscosity of the ink; this phenomenon is related to the chemical and physical characteristics of the ink and can be minimised to at least within a certain temperature range, by appropriately defining the ink's composition.
- Fig. 3 illustrates graphically by means of the dashed line 1 the experimental pattern of knee energy Eg in function of temperature variations (delta T).
- an integrated circuit chip that includes MOS transistor switches onto the same silicon substrate containing the ejection resistors, but this solution does not control the temperature Ts of the substrate, nor does regulate the heating pulses supplied to each ejection resistor.
- It is another object of the present invention to define an ink jet printhead comprising a semiconductor substrate on which are integrated ejection resistors and MOS transistors for supplying energy to the resistors, characterized by the fact that automatic compensation of the energetic operating point of the ejection resistors on variations of temperature of the substrate is provided using the channel resistance of the conducting MOS transistors.
- It is a further object of the present invention to define an ink jet printhead comprising a semiconductor substrate on which are integrated ejection resistors and MOS transistors for supplying energy to the resistors, characterized by the fact that the Rc/R ratio of the conduction channel resistance Rc of the MOS transistors to the resistance R of the ejection resistors has an established value of between 0.10 and 0.25.
- R is taken to indicate the resistance of ejection resistor Ri
- Rc represents the channel resistance of MOS transistor TRi during conduction
- V is the voltage powering the circuit illustrated in Fig. 1
- t is the time during which MOS transistor TRi is maintained in conduction by electronic controller 101 in order to produce ejection of a droplet of ink by ejection resistor Ri
- Et V 2 t/(R + Rc).
- the known art counsels designing the MOS transistor TRi with a channel resistance Rc as low as possible (ideally 0): the merit of the present invention is that of having identified a way of taking advantage of the existence of a channel resistance Rc other than 0 in order to obtain automatic compensation of the energetic operating point of each ejection resistor Ri on variations of the substrate temperature.
- Rc T1 Rc T0 [1 + 0.001 (T1 - T0)].
- Eg T1 Eg T0 [1 - 0.003 (T1 - T0)].
- Rc belongs to the denominator of equation (3), an increase in its value as temperature rises results in a corresponding decrease in the value of El, and it is thus possible to determine a field of values for resistance Rc such that, at least within a defined range of temperatures, the decrease in the value of El optimally compensates the parallel decrease in the value of Eg.
- the overall result obtained is that the value of El automatically adapts to variations of the value of Eg as temperature Ts of the substrate varies, thereby maintaining the El - Eg difference constant.
- the value of this ratio is between approximately 0.10 and 0.25, preferably between 0.15 and 0.21
- the pattern of straight lines representing the knee energy Eg and working energy El is substantially parallel, meaning that their respective values decrease by like amounts and that accordingly the difference between them remains constant on variation of the substrate temperature Ts.
- the ink jet printhead and method of operation described above mean that the MOS transistors for driving of the ejection resistors may be built smaller in size than would be necessary to obtain the very low channel resistance values Rc, that are considered preferable in the known art, if only for the fact that they minimize the amount of energy dissipated by the MOS transistor TRi when conducting.
- the compensation between energy El and energy Eg is performed in an extremely localized manner, nozzle by nozzle, and is therefore extremely effective even in cases where significant differences in temperature arise between the areas of the head as a result of the printing method not involving all the nozzles in a uniform way.
- a printhead with a different scale of component integration may be used, one for example comprising not only the MOS drive transistors, but also logic type circuits (shift registers, decoders, etc.).
- the printhead may be of the removable type, fitted on a carriage that runs across the entire width of the sheet of paper that is being printed on, or of the fixed type capable of ejecting droplets of ink along the entire width of the sheet (line head).
- printheads for black and colour printing in which the ink reservoirs, instead of being integrated in the head (the type of printhead known as "monobloc"), are removable and replaceable so that once they are empty, only the reservoir and not the entire printhead need be replaced (“refillable” heads).
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Claims (7)
- Tête d'impression à jet d'encre (100) comprenant au moins une résistance (Ri) pour éjecter des gouttelettes d'encre, et au moins un transistor MOS (Tri) pour fournir une énergie de fonctionnement (El) à ladite au moins une résistance (Ri), ledit au moins un transistor MOS (Tri) ayant une résistance de canal (Rc), ladite au moins une résistance et ledit au moins un transistor MOS étant tous deux intégrés sur un substrat semi-conducteur commun, ladite tête d'impression à jet d'encre (100) comprenant en outre des moyens de compensation pour compenser automatiquement ladite énergie de fonctionnement (El) fournie à ladite au moins une résistance en fonction de changements de température (Ts) dudit substrat commun, caractérisée en ce que lesdits moyens de compensation comprennent ladite résistance de canal (Rc) pendant la conduction dudit au moins un transistor MOS (Tri).
- Tête d'impression à jet d'encre selon la revendication 1, dans laquelle ladite au moins une résistance (Ri) a une valeur de résistance R et ladite résistance de canal (Rc), pendant la conduction, a une valeur Rc, caractérisée en ce que le rapport Rc/R présente une valeur déterminée comprise entre 0,10 et 0,25.
- Tête d'impression à jet d'encre selon la revendication 1, caractérisée en ce que ladite énergie de fonctionnement (El) est supérieure à une énergie de tension (Eg), d'une quantité donnée, ladite quantité restant constante lors de changements de température (Ts) dudit substrat.
- Tête d'impression (100) selon la revendication 1, caractérisée en ce que ladite tête d'impression est montée sur un chariot capable d'effectuer un mouvement vers l'avant et un mouvement vers l'arrière tout le long d'une largeur d'un support d'impression pour déposer des gouttelettes d'encre sur ledit support d'impression.
- Tête d'impression (100) selon la revendication 1, caractérisée en ce que ladite tête d'impression (100) est du type ayant un réservoir d'encre remplaçable.
- Procédé d'impression à l'aide d'une tête d'impression à jet d'encre, comprenant les étapes suivantes consistant à :avoir une tête d'impression comprenant au moins une résistance (Ri) pour éjecter des gouttelettes d'encre, et au moins un transistor MOS (Tri) pour fournir une énergie de fonctionnement (El) à ladite au moins une résistance, ladite au moins une résistance et ledit au moins un transistor MOS étant tous deux intégrés sur un substrat semi-conducteur commun, et ledit au moins un transistor MOS ayant une résistance de canal (Rc);avoir des moyens de compensation pour compenser automatiquement ladite énergie de fonctionnement (El) fournie à ladite résistance en fonction des changements de température dudit substrat commun, caractérisé en ce que lesdits moyens de compensation comprennent ladite résistance de canal (Rc) dudit transistor MOS pendant la conduction.
- Procédé selon la revendication 6, dans lequel ladite au moins une résistance (Ri) possède une valeur de résistance R et ladite résistance de canal (Rc), pendant la conduction, a une valeur Rc, caractérisé en ce que le rapport Rc/R présente une valeur déterminée comprise entre 0,10 et 0,25.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT95TO000521A IT1276431B1 (it) | 1995-06-22 | 1995-06-22 | Testina di stampa a getto di inchiostro con componenti di pilotaggio integrati |
ITTO950521 | 1995-06-22 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0749834A2 EP0749834A2 (fr) | 1996-12-27 |
EP0749834A3 EP0749834A3 (fr) | 1997-07-23 |
EP0749834B1 true EP0749834B1 (fr) | 2001-04-04 |
Family
ID=11413667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96109564A Expired - Lifetime EP0749834B1 (fr) | 1995-06-22 | 1996-06-14 | Tête d'impression à jet d'encre avec composants de commande intégrés |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0749834B1 (fr) |
JP (1) | JP3795959B2 (fr) |
DE (1) | DE69612327T2 (fr) |
IT (1) | IT1276431B1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1310121B1 (it) * | 1999-07-19 | 2002-02-11 | Olivetti Lexikon Spa | Metodo per la rilevazione delle gocce eiettate da una testina distampa termica a getto d'inchiostro, e relativa stampante con |
GB2371268B (en) * | 2000-12-11 | 2002-12-11 | Macroblock Inc | Printhead circuit |
US6883894B2 (en) * | 2001-03-19 | 2005-04-26 | Hewlett-Packard Development Company, L.P. | Printhead with looped gate transistor structures |
JP2005305966A (ja) | 2004-04-26 | 2005-11-04 | Canon Inc | 液体吐出ヘッド |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4717924A (en) * | 1986-08-18 | 1988-01-05 | Ncr Corporation | Thermal printing control system |
JPH0764072B2 (ja) * | 1988-03-07 | 1995-07-12 | ゼロックス コーポレーション | バブル・インクジェット印字機構のシリコン集積回路チップ |
JP2502345B2 (ja) * | 1988-06-28 | 1996-05-29 | 株式会社日立製作所 | サ―マルヘッドの駆動装置 |
US5223853A (en) * | 1992-02-24 | 1993-06-29 | Xerox Corporation | Electronic spot size control in a thermal ink jet printer |
-
1995
- 1995-06-22 IT IT95TO000521A patent/IT1276431B1/it active IP Right Grant
-
1996
- 1996-06-14 DE DE69612327T patent/DE69612327T2/de not_active Expired - Lifetime
- 1996-06-14 EP EP96109564A patent/EP0749834B1/fr not_active Expired - Lifetime
- 1996-06-14 JP JP15368496A patent/JP3795959B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69612327D1 (de) | 2001-05-10 |
EP0749834A2 (fr) | 1996-12-27 |
EP0749834A3 (fr) | 1997-07-23 |
ITTO950521A0 (it) | 1995-06-22 |
ITTO950521A1 (it) | 1996-12-22 |
JPH091800A (ja) | 1997-01-07 |
IT1276431B1 (it) | 1997-10-31 |
DE69612327T2 (de) | 2001-11-29 |
JP3795959B2 (ja) | 2006-07-12 |
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