EP0177633A1 - Enregistreur sur feuilles électrothermique - Google Patents

Enregistreur sur feuilles électrothermique Download PDF

Info

Publication number
EP0177633A1
EP0177633A1 EP84112246A EP84112246A EP0177633A1 EP 0177633 A1 EP0177633 A1 EP 0177633A1 EP 84112246 A EP84112246 A EP 84112246A EP 84112246 A EP84112246 A EP 84112246A EP 0177633 A1 EP0177633 A1 EP 0177633A1
Authority
EP
European Patent Office
Prior art keywords
heating elements
carrier plate
recorder according
writing
face
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
EP84112246A
Other languages
German (de)
English (en)
Other versions
EP0177633B1 (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
International Standard Electric Corp
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, International Standard Electric Corp 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 is based on a paperless recorder according to the preamble of claim 1.
  • a paper recorder of the aforementioned type is known from DE-AS 12 43 432. With the writing mechanism described there, only relatively roughly rasterized characters and images can be displayed. This is due to the horizontally isolated support plates and the vertical to the spaced heating elements. The arrangement of the heating elements on the end face of the carrier plates exposes them to increased abrasion due to their contact with 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 image points. The vertical arrangement of the writing boards combined into a block blocks the view of some of the previously written lines.
  • the carrier 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 plates level out.
  • the power is supplied via electrodes fitted or attached to the rear of the heating elements. The distance between the holes required for reasons of stability only allows a roughly rasterized recording.
  • the above heating elements are subject to abrasion.
  • the print head hides a part of the written text.
  • the object of the invention is to provide an electrothermal writing mechanism for sheet-fed printers which, with a simple structure, enables optimum pixel density and image quality with a long service life of the print head.
  • the nitrided end face essentially absorbs the contact 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 connected directly 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 examination of the text that has already been written and is being 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 is transported in the direction of the arrow. Through a slit 3, it emerges from the case of the paperless recorder.
  • a writing board 12 which extends radially to the platen roller 4 and extends along the writing line.
  • a supporting plate 6 has a supporting element 6 with its one end face 6b under slight 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.
  • the switching 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 connectors 13 arranged on the rear longitudinal edge of the carrier 6 to the switching 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 large number of closely adjacent heating elements 7.
  • the correspondingly high number of connections to the switching circuits 11 are symbolically represented by the conductor tracks 10.
  • the carrier plate 6 is longer than the writing field B on both sides.
  • the carrier plate 6 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 is used 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.
  • the carrier plate 6 consists of an electrically and good heat-conducting material, for example steel.
  • the remaining part 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 support plate 6 in accordance with the radius of curvature r of the platen roller 4 in order to secure a contact across the width of the end face 6b.
  • the end face 6b is nitrided in a manner known per se.
  • the length L 1 of the heating elements 7 is equal to the height h at a division T 1 , which corresponds to the image point spacing during recording.
  • the recording medium 5 is labeled in raster lines across the entire writing field B during a continuous rotary movement of the platen roller 4.
  • FIG. 4 shows, in a schematic representation, 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 tensioning device 20.
  • FIG. 5a shows, on a greatly enlarged scale, the arrangement of FIG. 4 in section VV and in partial representation, while FIG. 5b shows a section of the writing boards 16 in the direction of view represents end faces 6b of the carrier plates 6 resting on the recording medium 5. Except for the length l 2 and the spacing T 2 of the heating elements 8, the writing boards 16 are identical to the board 12 of FIG. 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 l 2 . This is dimensioned such that the distance between the individual heating elements 8 is somewhat smaller than the length l 2 of the heating elements 8.
  • a closed typeface can also be achieved in a 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. 5a, while the respective raster line is added via the right writing board 16 after a corresponding advance of the recording medium 5 by the angular path ⁇ 1 . Corresponding to the length l 2 of the heating elements 8, the image points recorded next to one another at the division distance T 1 overlap slightly, so that a closed font image is also guaranteed in the horizontal.
  • FIG. 6 a shows, on a greatly enlarged scale, a third embodiment of a writing board 17 in cross-section and in partial representation, while FIG.
  • the latter like the carrier plates 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 and are connected flush with the end surface 15c and are electrically connected to the carrier plate 15.
  • the resistive tracks 18 includes the specificationhrie according - surrounded embodiments, the glaze 9 in the height h of the resistor tracks to 18th
  • the conductor tracks 10 are applied to this insulating layer and conductively connected to the respective resistance track 18 at the upper end.
  • the conductor tracks 10 At least in the contact area with the respective resistance track 18, the conductor tracks 10 have a width which is approximately equal to the desired length L 2 of the pixel area and which determine the heating areas 18 '. 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 image point number per Area unit is required, which requires a correspondingly high number of closely adjacent heating elements.
  • the conductor tracks 10 are arranged at the pitch T 2 and the conductor tracks 10 are one te laterally offset from the other side by the pitch T 1 .
  • 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, for example by recording the raster line image points with an even ordinal number over the heating areas 18 'on the lower side of the carrier plate 15, while the respective raster line through the image points with an odd order number after an advance of the recording medium 5 is supplemented by the angular path ⁇ 2 via the heating areas 18 'on the upper side surface 15b of the carrier plate 15.
  • FIG. 7a shows, on a greatly enlarged scale, a fourth embodiment of a writing board 23 in cross-section and in partial representation, while FIG. 7b shows a section of the writing board 23 in the direction of view of the end face 21b of the associated carrier plate 21 which is in contact with the recording medium 5.
  • the carrier plate 21 consists of an insulating material of high thermal conductivity, for example ceramic.
  • the entire upper side surface 21a of the carrier plate 21 is electrically conductive, for example by means of a laminated or vapor-deposited copper layer 22.
  • the heating elements 7 are arranged flush with the end face 21b in a conductive connection to the copper layer 22.
  • the copper layer 22 is the common electrical return conductor for the heating elements 7 and, due to its planar design, serves at the same time 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 Figures 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.

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  • Electronic Switches (AREA)
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 true EP0177633A1 (fr) 1986-04-16
EP0177633B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5748219A (en) * 1994-12-09 1998-05-05 Thermopol, Inc. Electrothermal recorder

Families Citing this family (6)

* 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
EP0857578B1 (fr) * 1996-12-16 2002-03-13 Agfa-Gevaert Ensemble tête d'impression comprenant une pluralité de têtes d'impression
DE69711019T2 (de) * 1996-12-16 2002-10-17 Agfa Gevaert Nv Thermokopfanordnung mit mehreren Thermoköpfen
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403202A1 (fr) * 1977-09-19 1979-04-13 Termcom Inc Pellicule a couches multiples utilisee dans un appareil d'impression par resistance electrique
GB2033843A (en) * 1978-11-08 1980-05-29 Leeds & Northrup Ltd Thermal printer platen
FR2471864A1 (fr) * 1979-12-19 1981-06-26 Radiotechnique Compelec Tete d'impression thermique a lecture immediate et procede pour la fabriquer
DE3330966A1 (de) * 1983-08-27 1985-03-14 Standard Elektrik Lorenz Ag, 7000 Stuttgart Elektrothermischer blattschreiber

Family Cites Families (10)

* 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
US4242565A (en) * 1979-06-05 1980-12-30 Minnesota Mining And Manufacturing Company Thermal print head
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2403202A1 (fr) * 1977-09-19 1979-04-13 Termcom Inc Pellicule a couches multiples utilisee dans un appareil d'impression par resistance electrique
GB2033843A (en) * 1978-11-08 1980-05-29 Leeds & Northrup Ltd Thermal printer platen
FR2471864A1 (fr) * 1979-12-19 1981-06-26 Radiotechnique Compelec Tete d'impression thermique a lecture immediate et procede pour la fabriquer
DE3330966A1 (de) * 1983-08-27 1985-03-14 Standard Elektrik Lorenz Ag, 7000 Stuttgart Elektrothermischer blattschreiber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5748219A (en) * 1994-12-09 1998-05-05 Thermopol, Inc. Electrothermal recorder

Also Published As

Publication number Publication date
EP0177633B1 (fr) 1989-10-11
US4606267A (en) 1986-08-19

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