EP0177633B1 - Enregistreur sur feuilles électrothermique - Google Patents

Enregistreur sur feuilles électrothermique Download PDF

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Publication number
EP0177633B1
EP0177633B1 EP84112246A EP84112246A EP0177633B1 EP 0177633 B1 EP0177633 B1 EP 0177633B1 EP 84112246 A EP84112246 A EP 84112246A EP 84112246 A EP84112246 A EP 84112246A EP 0177633 B1 EP0177633 B1 EP 0177633B1
Authority
EP
European Patent Office
Prior art keywords
heating elements
carrier plate
page printer
face
spacing
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
Application number
EP84112246A
Other languages
German (de)
English (en)
Other versions
EP0177633A1 (fr
Inventor
Gerhard Wessel
Heinz Ebner
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.)
Alcatel Lucent NV
Original Assignee
Alcatel NV
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 DE19833330966 priority Critical patent/DE3330966A1/de
Priority claimed from DE19833330966 external-priority patent/DE3330966A1/de
Application filed by Alcatel NV filed Critical Alcatel NV
Priority to EP84112246A priority patent/EP0177633B1/fr
Priority to US06/670,778 priority patent/US4606267A/en
Publication of EP0177633A1 publication Critical patent/EP0177633A1/fr
Application granted granted Critical
Publication of EP0177633B1 publication Critical patent/EP0177633B1/fr
Expired legal-status Critical Current

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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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/335—Structure of thermal heads
    • B41J2/33555—Structure of thermal heads characterised by type
    • B41J2/33565—Edge type resistors
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/345—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads characterised by the arrangement of resistors or conductors

Definitions

  • the invention relates to a paper pen according to the preamble of claim 1.
  • DE-AS 12 43 432 is a paper recorder with which only relatively roughly rasterized characters and images can be represented. This is caused in the horizontal by the mutually insulated carrier plates and in the vertical by the spaced heating elements.
  • the arrangement of the heating elements on the end face of the carrier plates exposes them to increased abrasion by the system on the recording medium. They must therefore be provided with a protective layer that prevents direct contact between the heating elements and the recording medium. Depending on the layer thickness, this requires a higher heat output and can lead to blurred contours of the pixels.
  • the vertical arrangement of the writing boards combined into a block blocks the view of some of the lines previously written.
  • a writing board is described in accordance with the writing board mentioned in the preamble of claim 1 with a line-wide carrier plate, on one broad side of which heating elements are arranged closely adjacent in a row.
  • the heating elements are flush with the end face of the carrier plate which adjoins the broad side.
  • the writing board In the assembled state, the writing board is arranged tangentially to the platen and rests with the heating elements on the recording medium wrapping around the platen.
  • the arrangement of the heating elements flush with the face enables direct viewing of the recording.
  • the direct sole installation of the heating elements on the recording medium also requires a protective coating against abrasion, which has the aforementioned effect.
  • the support plate consists of a material of good electrical and thermal conductivity.
  • the carrier plate has a plurality of holes arranged in a row or in a matrix which are filled with a resistance material which forms the heating elements. These protrude from the plate level.
  • the power is supplied via electrodes inserted or attached to the rear of the heating elements.
  • the distance between the holes which is necessary for reasons of stability, only allows a roughly rasterized recording.
  • the above heating elements are subject to abrasion.
  • the print head hides part of the written text.
  • the object of the invention is to provide an electrothermal writing mechanism for sheet printers which, by preventing the abrasion of the heating elements, enables a long service life of the printhead with a simultaneously high image quality.
  • the nitrided end face essentially absorbs the system pressure on the recording medium due to the heating elements attached laterally from the end face to the carrier plate, so that the heating elements do not require a protective layer against abrasion and are in direct contact with the recording medium that the heating elements are directly connected to the carrier plate and this serves as a common return conductor and at the same time as a heat conductor and that the arrangement of the writing plate allows a direct view of the text already written and created.
  • a glass pane 2 is embedded in the hood 1, which allows a view of the labeled part of a heat-sensitive recording medium 5.
  • the latter lies against a platen roller 4 with the radius r, through which the recording medium 5 in the direction of the arrow tion is transported. Through a slot 3, it emerges from the case of the paperless recorder.
  • a writing plate 12 extending along the writing line is arranged below the glass pane 2 radially to the platen roller 4. It has a support plate 6 as the supporting element, which with its one end face 6b lies under weak spring pressure over the entire length against the recording medium 5 wrapping around the platen roller 4.
  • Heating elements 7 are arranged flush with the end face 6b (FIG. 3a) on at least one side face 6a of the carrier plate 6. These are connected via conductor tracks 10 to integrated circuits 11 on the carrier plate 6.
  • the circuits 11 are used to implement control commands for the heating elements 7.
  • the control commands come from a central control unit (not shown) via feed lines 14 and via plug connectors 13 arranged on the rear longitudinal edge of the carrier 6 to the circuits 11.
  • the carrier plate 6 is provided over the lettering field width B along the end face 6b resting on the recording medium 5 with a plurality of closely adjacent heating elements 7.
  • the correspondingly high number of connections to the circuits 11 are symbolically represented by the conductor tracks 10.
  • the carrier plate 6 is "longer on both sides than the lettering field width B. With its longitudinal ends, the carrier plate 6 is suspended in a tensioning device 19 which is adjustable transversely to the tensioning direction in the plane of the carrier plate 6. The transverse adjustment serves to adjust the spring force with which the Carrier plate 6 rests on the end face of the recording medium 5.
  • FIG. 3a shows, on a greatly enlarged scale, section A according to FIG. 1 as a first embodiment of a writing board 12, while FIG. 3b shows a section of the writing board 12 in the direction of view of the end face 6b of the carrier plate 6 resting on the recording medium 5.
  • the carrier plate 6 consists of an electrically and good heat-conducting material, for. B. steel. Flush with the end face 6b in the longitudinal direction on the side face 6a closely adjacent heating elements 7 are arranged in an electrically conductive manner with the carrier plate 6. The remaining part of the side surface 6a including the spaces between the heating elements 7 is coated with a glaze 9, the thickness of which is equal to the height h of the heating elements.
  • the conductor tracks 10 are applied to this insulating layer at a distance from the heating elements 7 and are conductively connected to the upper ends of the heating elements 7.
  • the end face 6b including the heating elements 7 attached to the upper side face 6a, is concavely curved transversely to the longitudinal extent of the carrier plate 6 in accordance with the radius of curvature r of the platen roller 4 in order to ensure contact over the width of the end face 6b.
  • the end face 6b is nitrided in a manner known per se. With a square pixel area, the length 1 1 of the heating elements 7 equal to the height h at a pitch, T i corresponding to the pixel pitch in recording.
  • the inscription of the record carrier 5 takes place in raster lines across the entire text field width B during a continuous rotary movement of the platen roller 4.
  • FIG. 4 shows a schematic representation of a top view of two writing boards 16 which are arranged in mirror image to one another and which are suspended in a correspondingly designed clamping device 20.
  • FIG. 5a shows the arrangement of FIG. 4 in a section VV and in partial representation on a greatly enlarged scale
  • FIG. 5b shows a section of the writing boards 16 in the direction of view of the end faces 6b of the carrier plates 6 resting on the recording medium 5.
  • the write circuit boards 16 are identical except for the length 1 2 and the pitch T 2 of the heating elements 8 is identical with the circuit board 12 of Figure 3a.
  • the two boards 16 are arranged at a small angle to one another, the side surfaces 6a of the carrier plates 6, on which the heating elements 8 are arranged, facing one another.
  • the heating elements 8 are arranged at a pitch T 2 which is equal to twice the pixel distance (T 1 ).
  • the rows of heating elements of the two boards 16 are offset from one another by the pitch T 1 , so that the heating elements 8 of the two rows are in a gap with one another.
  • the heating elements 8 have a length of 1 2 . This is dimensioned so that the distance between the individual heating elements 8 is slightly smaller than the length 1 2 of the heating elements 8.
  • a closed typeface can also be achieved when recording in the longitudinal direction of the line, in that each raster line is recorded in two phases. If the direction of rotation of the platen roller 4, indicated by an arrow, is counterclockwise, the information content of each individual raster line is applied to the recording medium 5 in half by an interrupted line via the writing board 16 arranged on the left in FIG after a corresponding advance of the recording medium 5 by the angular path A 1 . Corresponding to the length 1 2 of the heating elements 8, the pixels recorded next to one another at the pitch T 1 overlap slightly, so that a closed typeface is also guaranteed in the horizontal.
  • FIG. 6a shows, on a greatly enlarged scale, a third embodiment of a writing board 17 in cross-section and in partial representation
  • FIG. 6b shows a section of the writing board 17 in the direction of view of the end face 15c of the associated door resting on the recording medium 5 gerplatte 15 represents.
  • the latter like the two writing boards 12 and 16 described above, also consists of an electrically and good heat-conducting material, the carrier plate 15, however, being approximately twice as thick as the aforementioned.
  • Continuous resistance tracks 18 of height h are arranged on both side surfaces 15a and 15b, which are connected flush with the end face 15c and are electrically conductively connected to the carrier plate 15.
  • the glaze 9 adjoins the resistance tracks 18 at the height h of the resistance tracks 18.
  • the conductor tracks 10 are applied to this insulating layer and conductively connected to the respective resistance track 18 at the upper end. At least in the contact region with the respective resistance track 18, the conductor tracks 10 have a width corresponding to the desired length 1 2 is approximately equal to the pixel area and the heating zones 18 'determine. Since the current always chooses the path of least resistance, practically only heating of the resistance track 18 takes place in the areas 18 'corresponding to the width of the conductor tracks 10. This is of practical importance in particular if a high resolution, ie a very high number of pixels per Area unit is required, which requires a correspondingly high number of closely adjacent heating elements.
  • the conductor tracks 10 are arranged at a pitch T 2 and the conductor tracks 10 on one side are laterally offset from one another on the other side by the pitch T.
  • the heating regions 18 ′ of the opposing resistance tracks 18, which are determined by the width of the conductor tracks 10, are thus spaced from one another.
  • each raster line is recorded in two phases, e.g. B. the raster line pixels with an even atomic number are recorded over the heating areas 18 'on the lower side of the carrier plate 15, while the respective raster line through the pixels with an odd atomic number after an advance of the recording medium 5 by the angular path A 2 over the heating areas 18' the upper side surface 15b of the carrier plate 15 is supplemented.
  • FIG. 7a shows, on a greatly enlarged scale, a fourth embodiment of a writing board 23 in cross-section and in a partial representation, while FIG.
  • the carrier plate 21 consists of an insulating material of high thermal conductivity, for. B. ceramics.
  • the entire upper side surface 21a of the carrier plate 21 is electrically conductive, e.g. B. by a laminated or evaporated copper layer 22.
  • the heating elements 7 are arranged in a conductive connection to the copper layer 22 flush with the end face 21b.
  • the copper layer 22 is the common electrical return conductor for the heating elements 7 and, due to its planar design, serves simultaneously and together with the carrier plate 21 as a conductor for the waste heat occurring during the operation of the writing mechanism. Otherwise, the structure of the writing board 21 corresponds to that of the writing board 12 according to FIGS. 3a and 3b. In this case too, the individual heating elements 7 can be replaced by a resistance track 18 according to FIGS. 6a and 6b, if a separate arrangement of the heating elements is not sensible for manufacturing reasons.

Landscapes

  • Electronic Switches (AREA)

Claims (14)

1. Mécanisme d'impression électrothermique à matrice de points pour impression tramée comportant une armature d'impression et au moins une plaque d'impression (12, 16, 17, 23) adaptée à celle-ci incluant une plaque support sur au moins une face latérale (6a, 15a, 15b, 21 a) de laquelle sont disposés des éléments chauffants (7, 8, 18) agencés en une rangée, lesquels se terminent au ras de la surface frontale (6b, 15c, 21b) de la plaque support, et leurs conducteurs électriques aller et retour, caractérisé en ce que la plaque support (6, 15, 21) a sa surface frontale (6b, 15c, 21b) adpatée à l'armature d'impression (rouleau d'impression 4) et recueille, de cette façon, la pression du support d'impression (5), et en ce que cette surface frontale, avec les faces des éléments chauffants (7, 8, 18) situées au ras de la surface frontale de la plaque support (6b, 15c, 21b) constitue la surface active de la plaque support.
2. Imprimante à page conforme à la revendication 1, caractérisée en ce que ladite plaque support (6, 15) consiste en un matériau électriquement conducteur.
3. Imprimante à page conforme à la revendication 1, caractérisée en ce que ladite plaque support (21) consiste en un matériau isolant et possède une face latérale (21a) électriquement conductrice.
4. Imprimante à page conforme à la revendication 2 ou 3, caractérisée en ce que ladite plaque support (6, 15, 21) est bonne conductrice de la chaleur.
5. Imprimante à page conforme à l'une quelconque des revendications 2 à 4, caractérisée en ce que lesdits éléments chauffants (7, 8, 18) sont connectés, d'une part, à ladite face latérale électriquement conductrice (6a, 15a, 15b, 21a) de la plaque support et, d'autre part, aux trajets conducteurs (10).
6. Imprimante à page conforme à l'une quelconque des revendications précédentes, caractérisé en ce que ladite face latérale (6a, 15a, 15b, 21a) de ladite plaque support (6, 15, 21), à l'exception des surfaces sur lesquelles lesdits éléments chauffants (7, 8, 18) sont disposés, est pourvue d'une couche isolante (glaçure 9) dont l'épaisseur est égale à la hauteur (h) desdits éléments chauffants (7, 8, 18) et sur laquelle sont disposés lesdits trajets conducteurs (10) s'étendant jusqu'auxdits éléments chauffants (7, 8, 18).
7. Imprimante à page conforme à la revendication 1, comprenant un rouleau de guidage de support d'impression dans la zone d'impression, caractérisée en ce que la surface frontale (6b, 15c, 21b) de ladite plaque support (6, 15, 21), y compris les éléments chauffants adjacents (7, 8, 18) possède une concavité égale à la courbure du rouleau (4).
8. Imprimante à page conforme à la revendication 6, caractérisée en ce que ladite surface frontale (6b, 15c, 21b) de ladite plaque support (6, 15, 21) est nitrurée.
9. Imprimante à page conforme à la revendication 1, caractérisée en ce que ladite plaque support (6, 15, 21) est plus longue que la largeur du champs d'impression (B) et est retenue entre des moyens de fixation (19, 20) agissant horizontalement, et en ce que ces moyens de fixation sont ajustables dans le plan de ladite plaque support (6, 15, 21), aussi bien que verticalement par rapport à celui-ci.
10. Imprimante à page conforme à la revendication 1, caractérisée en ce que deux plaques d'impression (16) sont disposées à distance l'une de l'autre, en ce que l'espacement divisionnel (T2) desdits éléments chauffants (B) correspond au double de l'espacement des points de la matrice (division Ti), en ce que la longueur (L) desdits éléments chauffants est quelque peu supérieure à leur espacement et en ce que lesdits éléments chauffants (7, 8) des deux plaques support (6) sont décalés les uns par rapport aux autres d'une division (Tl).
11. Imprimante à page conforme à la revendication 1, caractérisée en ce que, lorsqu'une seule plaque support (15) est utilisée, les éléments chauffants qui sont au ras de ladite face frontale (15c) sont disposés sur les deux faces latérales (15a, 15b).
12. Imprimante à page conforme à la revendication 11, caractérisée en ce que ledit espacement divisionnel (T2) desdits éléments chauffants correspond au double de l'espacement des points de matrice (division Ti), en ce que la longueur (L) desdits éléments chauffants est supérieure à leur espacement et en ce que lesdits éléments chauffants (7, 8) des deux faces latérales (15a, 15b) sont décalés les uns par rapport aux autres d'une division (Tl).
13. Imprimante à page conforme à l'une quelconque des revendications précédentes, caractérisé en ce qu'il est prévu un trajet résistant de chauffage permanent (18), qui est connecté aux- dits trajets conducteurs (10), et en ce que lesdits trajets conducteurs (10) ont une largeur correspondant à la longueur (L) des zones de chauffage respectives (18').
EP84112246A 1983-08-27 1984-10-11 Enregistreur sur feuilles électrothermique Expired EP0177633B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19833330966 DE3330966A1 (de) 1983-08-27 1983-08-27 Elektrothermischer blattschreiber
EP84112246A EP0177633B1 (fr) 1983-08-27 1984-10-11 Enregistreur sur feuilles électrothermique
US06/670,778 US4606267A (en) 1983-08-27 1984-11-13 Electrothermal page printer

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19833330966 DE3330966A1 (de) 1983-08-27 1983-08-27 Elektrothermischer blattschreiber
EP84112246A EP0177633B1 (fr) 1983-08-27 1984-10-11 Enregistreur sur feuilles électrothermique
US06/670,778 US4606267A (en) 1983-08-27 1984-11-13 Electrothermal page printer

Publications (2)

Publication Number Publication Date
EP0177633A1 EP0177633A1 (fr) 1986-04-16
EP0177633B1 true EP0177633B1 (fr) 1989-10-11

Family

ID=27191252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112246A Expired EP0177633B1 (fr) 1983-08-27 1984-10-11 Enregistreur sur feuilles électrothermique

Country Status (2)

Country Link
US (1) US4606267A (fr)
EP (1) EP0177633B1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6115464A (ja) * 1984-06-30 1986-01-23 Toshiba Corp 画像形成装置
FR2608099B1 (fr) * 1986-12-10 1989-03-31 Sagem Tete d'impression thermique a double colonne de pastilles chauffantes
JP2514543Y2 (ja) * 1987-03-12 1996-10-23 ブラザー工業株式会社 サ−マル印字装置
US5748219A (en) * 1994-12-09 1998-05-05 Thermopol, Inc. Electrothermal recorder
DE69711019T2 (de) * 1996-12-16 2002-10-17 Agfa-Gevaert, Mortsel Thermokopfanordnung mit mehreren Thermoköpfen
EP0857578B1 (fr) * 1996-12-16 2002-03-13 Agfa-Gevaert Ensemble tête d'impression comprenant une pluralité de têtes d'impression
JP6546409B2 (ja) * 2015-02-20 2019-07-17 東芝ホクト電子株式会社 サーマルプリントヘッド

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340381A (en) * 1963-10-29 1967-09-05 Corning Glass Works Thermal printing wafer and method for making the same
US3862394A (en) * 1974-04-03 1975-01-21 Honeywell Inc Thermal recording print head and method for manufacturing same
US3984809A (en) * 1975-11-20 1976-10-05 Michael L. Dertouzos Parallel thermal printer
SU647531A1 (ru) * 1977-07-07 1979-02-15 Проектно-Технологический И Научно-Исследовательский Институт Научнопроизводственного Объединения "Темп" Термопечатающа головка
US4151397A (en) * 1977-08-12 1979-04-24 E-Systems, Inc. Self-aligning thermal print head
US4195937A (en) * 1977-09-19 1980-04-01 Termcom, Inc. Electroresistive printing apparatus
GB2033843B (en) * 1978-11-08 1983-01-06 Leeds & Northrup Ltd Thermal printer platen
US4242565A (en) * 1979-06-05 1980-12-30 Minnesota Mining And Manufacturing Company Thermal print head
FR2471864A1 (fr) * 1979-12-19 1981-06-26 Radiotechnique Compelec Tete d'impression thermique a lecture immediate et procede pour la fabriquer
JPS58118273A (ja) * 1982-01-06 1983-07-14 Hitachi Ltd 感熱記録ヘツド
AU567487B2 (en) * 1982-01-25 1987-11-26 Sony Corporation Thermal printer
US4423425A (en) * 1982-02-01 1983-12-27 International Business Machines Corporation Thermal print head having glazed metal substrate
JPS5935956A (ja) * 1982-08-21 1984-02-27 Nippon Kogaku Kk <Nikon> サ−マルヘツド用発熱抵抗体の製造方法
DE3330966A1 (de) * 1983-08-27 1985-03-14 Standard Elektrik Lorenz Ag, 7000 Stuttgart Elektrothermischer blattschreiber

Also Published As

Publication number Publication date
EP0177633A1 (fr) 1986-04-16
US4606267A (en) 1986-08-19

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