EP0342995A2 - Tête d'enregistrement - Google Patents

Tête d'enregistrement Download PDF

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Publication number
EP0342995A2
EP0342995A2 EP89305077A EP89305077A EP0342995A2 EP 0342995 A2 EP0342995 A2 EP 0342995A2 EP 89305077 A EP89305077 A EP 89305077A EP 89305077 A EP89305077 A EP 89305077A EP 0342995 A2 EP0342995 A2 EP 0342995A2
Authority
EP
European Patent Office
Prior art keywords
recording
electrodes
return circuit
recording head
circuit electrode
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
EP89305077A
Other languages
German (de)
English (en)
Other versions
EP0342995A3 (en
EP0342995B1 (fr
Inventor
Yukihisa Takeuchi
Toshikazu Hirota
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.)
NGK Insulators Ltd
Original Assignee
NGK Insulators 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
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of EP0342995A2 publication Critical patent/EP0342995A2/fr
Publication of EP0342995A3 publication Critical patent/EP0342995A3/en
Application granted granted Critical
Publication of EP0342995B1 publication Critical patent/EP0342995B1/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
    • B41J2/33505—Constructional details
    • B41J2/3351—Electrode layers
    • 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
    • B41J2/33505—Constructional details
    • B41J2/33535—Substrates
    • 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
    • B41J2/33545—Structure of thermal heads characterised by dimensions
    • 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
    • B41J2/335—Structure of thermal heads
    • B41J2/3359—Manufacturing processes

Definitions

  • the present invention relates generally to a recording or printing head which is adapted to apply an electric current to an ink film or ribbon, or a recording medium, for effecting thermal printing of images such as characters on the recording medium. More particularly, the present invention is concerned with a multi-layer structure including a plurality of electrodes for locally energizing the ink film or recording medium.
  • the electrically resistive layer is locally energized to generate heat, by an electric current applied thereto by the electrodes of the recording head, so that a thermally fusible or vaporizable ink material on the corresponding local portions of the ink layer is softened or diffused due to heat of the electrically resistive layer, and then transferred to an ordinary recording medium.
  • the ink film may have an electrically resistive ink layer which serves both as an ink layer and an electrically resistive layer.
  • an electrically insulating layer is disposed between an array of the recording electrodes and the return circuit electrode or an array of the return circuit electrodes.
  • the recording and return circuit electrodes are positioned with a high degree of accuracy so as to provide a constant spacing between each recording electrode and the return circuit electrode or electrodes. This is desired for preventing a crosstalk between the electrodes, and for assuring a consistent image transfer with enhanced reproducibility, namely, for obtaining transferred images consisting of a multiplicity of uniformly pointed dots.
  • Another type of recording head as disclosed in laid-open Publication No. 63-87264 of unexamined Japanese Patent Application is adapted to perform its printing operation on a heat-sensitive paper (recording medium).
  • the heat-sensitive paper having both an electrically resistive layer and a coloring layer, or an electrically resistive coloring layer is directly held in contact with a recording surface of the recording head, while the heat-sensitive paper having only a coloring layer is used such that the recording head effects thermal printing of images on the paper through an electrically resistive film.
  • an electrically resistive ink layer as indicated above is used, as indicated in laid open Publication Nos.
  • the insulating layer disposed between the recording and return circuit electrodes is required to be made of a material having a lower degree of wear resistance than that of the electrodes.
  • the insulating layer also needs to have a considerably high degree of heat resistance, so as to prevent deterioration of its insulating property and a chronological change in the thickness of the layer, due to heat generated by the electrically resistive layer or electrically resistive ink or coloring layer, which lead to deterioration in the quality of printed or transferred images.
  • the insulating layer disposed between the electrodes has not satisfy the latter requirement for heat resistance, since the insulating layer is for example formed of a resin material such as an epoxy resin or a polyimide.
  • the insulating layer disposed between electrodes is made of an ordinary glass or ceramic material. While such an insulating layer is satisfactory in its heat resistance, the wear resistance of the insulating layer is higher than that of the electrodes, resulting in an insufficient electrical contact of the electrodes with the electrically resistive layer of the ink film. Thus, it is difficult to obtain an optimum relative wear resistance between the insulating layer and the electrodes.
  • the electrically insulating layer is formed of mica
  • the layer has a high degree of heat resistance and sufficient insulating property.
  • the use of ordinary mica for the insulating layer may cause insufficient uniformity in the thickness of the insulating layer, which determines a spacing between the recording and return circuit electrodes. Consequently, the recording head having such an insulating layer suffers from deterioration in the quality of the transferred images.
  • the present invention was developed in view of the above problems experienced in the prior art. It is therefore an object of the invention to provide a recording head having a multi-layer structure including a plurality of recording electrodes and at least one return circuit electrode, which assures improved heat resistance, sufficient electrical insulation between the recording and return circuit electrodes, and a stable permanent electrical contact between the electrodes and an electrically resistive layer or electrically resistive ink or coloring layer of an ink film or a heat-sensitive recording medium, so as to obtain a high quality of printed images.
  • a recording head having a plurality of recording electrodes and at least one return circuit electrode, which comprises an insulating layer consisting of an integrated or foliated mica disposed between an array of the plurality of recording electrodes and the above-indicated at least one return circuit electrode, so as to form a multi-layer structure which includes the recording electrodes, the above-indicated at least one return circuit electrode and the insulating layer.
  • the recording electrodes and the above-indicated at least one return circuit electrode are formed of an electrically conductive material which has a higher degree of wear resistance than that of the integrated mica.
  • the recording head wherein an integrated mica is used as the insulating layer disposed between the recording and return circuit electrodes which are highly resistant to wear, a spacing between each recording electrode and the corresponding return circuit electrode is defined with high consistency, thereby permitting a stable permanent contact of the recording and return circuit electrodes with the electrically resistive layer or electrically resistive ink or coloring layer of the ink film or heat-sensitive recording medium.
  • the use of the integrated mica is effective to protect the insulating layer against deterioration of its insulating property due to heat generated by the electrically resistive layer, for example, and to avoid a chronological change in the thickness of the insulating layer, which has adverse influences on the recording head.
  • the recording head permits high-speed printing with high operating reliability, and an improved quality of the obtained images.
  • the recording and return circuit electrodes of the recording head according to the invention are formed of an electrically conductive material which has a higher degree of wear resistance than the integrated mica. More specifically, metals such as chromium, titanium, tantalum, zirconium, alloys containing at least one of these metals, and compounds of these metals are preferably used as a major component of the electrically conductive material for the electrodes, since these metals or alloys have high mechanical wear resistance, and are effective in minimizing consumption of the electrodes based on their electric operations. Among the metals indicated above, chromium metals, or alloys or compounds containing chromium are particularly preferrably used as a major component of the electrically conductive material for the electrodes.
  • the recording head includes a first and a second substrate, which are easier to wear than the electrodes formed on the substrates.
  • the substrates are preferably formed of a ceramic material which has higher heat resistance and lower hardness than those of the material for the electrodes.
  • a substrate employing an integrated or foliated mica, or a highly machinable glass ceramic containing mica is preferred.
  • the integrated mica used as an insulating layer exhibits an optimum wear characteristic which permits a better contact between the electrodes and the electrically resistive layer or electrically resistive ink or coloring layer, and a high quality of images to be printed.
  • the integrated mica consists of a relatively thin sheet of electrically insulating ceramic material, which is elastic, and highly heat-resistant, i.e., resistant to a temperature of 500 o C or higher. Accordingly, the recording head of the present invention is capable of applying suitable amounts of printing pressure and heat to the ink layer of the ink film, even if the image transfer operation is effected at a considerably high speed.
  • the integrated mica is formed by foliating mica flakes into a thin sheet while being compressed with a high pressure at a high temperature.
  • the integrated mica is a preferred material for the insulating layer disposed between the electrodes, in terms of its excellent consistency in the thickness of the sheet and its resistance to flaking-off.
  • the integrated mica generally has a thickness of 40-500 microns.
  • an integrated mica is superposed on a substrate on which a plurality of recording electrodes are formed in an array.
  • a suitable adhesive consisting of an inorganic material such as alumina, silica and boron nitride, a resin material such as epoxy, phenol and polyimide, or a compound including the inorganic and resin materials indicated above may be used to bond the substrate and the mica sheet with each other.
  • the bonding is also possible by using a molten glass as an adhesive, or by using a jig for mechanically fixing the substrate and the mica sheet to each other.
  • a recording head which has a laminar or multi-layer structure including two substrates 1.
  • Each substrate 1 is formed of a highly machinable, glass ceramic containing mica.
  • a film of chromium is formed by sputtering, and the formed chromium film is subjected to heat treatment.
  • a planar common return circuit electrode 3 is formed on one of the substrates 1.
  • the film of chromium applied to the other substrate 1 is subjected to a photo-etching process well known in the art.
  • Each recording electrode 2 has a width of 80 microns and a thickness of 4 microns, and the electrodes 2 are equally spaced apart from each other at a pitch of 170 microns (distance between centers of the adjacent electrodes 2)
  • an insulating layer 4 in the form of an integrated or foliated mica having a thickness of 100 microns so that the insulating layer 4 is bonded to the return circuit electrode 3 and the recording electrodes 2 or corresponding substrate 1, through respective adhesive layers 5.
  • the recording head (Example 1) is prepared.
  • the recording head includes the single substrate 1, array of recording electrodes 2, insulating layer 4, and adhesive layers 5 as used in the embodiment of Fig. 1, and a planar common return circuit electrode 6 which consists of an electrically conductive foil of stainless steel having a thickness of 50 microns.
  • the recording head of the embodiment of Fig. 2 further includes a plate 7 made of alumina, which is superposed on the foil of the return circuit electrode 6, in place of the substrate 1 which supports the return circuit electrode 3 of the preceding embodiment.
  • Fig. 3 shows a modified embodiment of the recording head which is different from Example 1 of Fig. 1 in that a plurality of return circuit electrodes 3 similar to the recording electrodes 2 are formed in an array by a suitable pattern forming process.
  • a distance between each recording electrode and the return circuit electrode in a direction of thickness of the multi-layer structure i.e., a sum of the thicknesses of the insulating layer and adhesive layers was measured.
  • the results of the measurements were indicated in Table 1.
  • a recording head was prepared by forming the insulating layer of an epoxy resin (Example 3).
  • Another comparative example of the recording head was prepared such that the insulating layer was formed of ordinary mica (Example 4).
  • the results of the measurements on these comparative examples were also indicated in Table 1.
  • Recording devices incorporating the recording heads of Examples 1-4 were tested by continuously moving the recording head with its recording electrodes held in sliding contact with an electrically resistive layer of an ink film, so as to effect printing on a recording medium. During the test, a change in the quality of images printed on the recording medium was observed. The test showed high-density, high-quality images printed by the recording devices incorporating the recording heads of Examples 1 and 2 each of which uses an integrated mica as the insulating layer. After the test, the recording surfaces of the recording heads of Examples 1 and 2 which had been held in contact with the electrically resistive layer were observed with a microscope. This microscopic observation revealed that the recording and return circuit electrodes protruded from the exposed end faces of the substrate(s) and the insulating layer in a direction perpendicular to the plane of the recording surface of the head.
  • the distance between each recording electrode and corresponding return circuit electrode is determined with high accuracy and consistency, thereby assuring a better electrical contact of the recording and return circuit electrodes with the electrically resistive layer of the ink film, and a suitable amount of printing pressure on the ink layer of the ink film. Even if a printing cycle by the recording head is repeated with the electrically resistive layer being continuously heated, the insulating layer disposed between the recording and return circuit electrodes does not suffer from a substantial change due to heat generated by the resistive layer. Accordingly, the present recording head is capable of effecting high-speed printing with improved operating reliablity and enhanced quality of printed images.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electronic Switches (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP19890305077 1988-05-20 1989-05-19 Tête d'enregistrement Expired EP0342995B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP124496/88 1988-05-20
JP12449688 1988-05-20
JP8915589A JPH0248959A (ja) 1988-05-20 1989-04-07 通電方式記録ヘッド
JP89155/88 1989-04-07

Publications (3)

Publication Number Publication Date
EP0342995A2 true EP0342995A2 (fr) 1989-11-23
EP0342995A3 EP0342995A3 (en) 1990-07-04
EP0342995B1 EP0342995B1 (fr) 1992-12-16

Family

ID=26430589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890305077 Expired EP0342995B1 (fr) 1988-05-20 1989-05-19 Tête d'enregistrement

Country Status (3)

Country Link
EP (1) EP0342995B1 (fr)
JP (1) JPH0248959A (fr)
DE (1) DE68903876T2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0431551A2 (fr) * 1989-12-07 1991-06-12 Matsushita Electric Industrial Co., Ltd. Impression par transfert avec feuille résistive et têtes à électrodes
EP0457574A2 (fr) * 1990-05-16 1991-11-21 Ngk Insulators, Ltd. Tête d'enregistrement ayant deux substrats superposés tel que la surface supportant les électrodes de l'un des substrats est face à la surface ne supportant les électrodes de l'autre substrat
EP0457575A2 (fr) * 1990-05-16 1991-11-21 Ngk Insulators, Ltd. Tête d'enregistrement dans laquelle l'arrangement d'électrode d'enregistrement et la feuille d'électrode du circuit retour sont données dur des surfaces opposées respectives du substrat isolé ayant une extrémité distale à paroi mince

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0310853A (ja) * 1989-06-08 1991-01-18 Matsushita Electric Ind Co Ltd 電極ヘッド
US5771114A (en) * 1995-09-29 1998-06-23 Rosemount Inc. Optical interface with safety shutdown
US5727110A (en) * 1995-09-29 1998-03-10 Rosemount Inc. Electro-optic interface for field instrument

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2094799A5 (fr) * 1969-08-11 1972-02-04 Ncr Co
JPS60174664A (ja) * 1984-02-21 1985-09-07 Seiko Epson Corp 記録ヘツド
JPS6294355A (ja) * 1985-10-21 1987-04-30 Seiko Epson Corp 記録ヘツド
JPS6299162A (ja) * 1985-10-25 1987-05-08 Seiko Epson Corp 記録ヘツド

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2094799A5 (fr) * 1969-08-11 1972-02-04 Ncr Co
JPS60174664A (ja) * 1984-02-21 1985-09-07 Seiko Epson Corp 記録ヘツド
JPS6294355A (ja) * 1985-10-21 1987-04-30 Seiko Epson Corp 記録ヘツド
JPS6299162A (ja) * 1985-10-25 1987-05-08 Seiko Epson Corp 記録ヘツド

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN. vol. 26, no. 8, January 1984, NEW YORK US pages 4134 - 4135; A. E. GRAHAM: "FLEXIBLE THERMAL PRINTHEAD" *
IBM TECHNICAL DISCLOSURE BULLETIN. vol. 27, no. 6, November 1984, NEW YORK US pages 3421 - 3422; M. ACCIAI: "FABRICATION PROCESS FOR PRINT ELECTRODE ARRAYS" *
PATENT ABSTRACTS OF JAPAN vol. 10, no. 14 (M-447)(2071) 21 January 1986, & JP-A-60 174664 (HARAKAZU MATSUSHITA) 07 September 1985, *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 302 (M-629)(2749) 02 October 1987, & JP-A-62 94355 (MANABU NISHIWAKI) 30 April 1987, *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 316 (M-631)(2763) 15 October 1987, & JP-A-62 99162 (KAORU MOMOSE) 08 May 1987, *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0431551A2 (fr) * 1989-12-07 1991-06-12 Matsushita Electric Industrial Co., Ltd. Impression par transfert avec feuille résistive et têtes à électrodes
EP0431551A3 (en) * 1989-12-07 1992-06-03 Matsushita Electric Industrial Co., Ltd. Resistive sheet transfer printing and electrode heads
EP0457574A2 (fr) * 1990-05-16 1991-11-21 Ngk Insulators, Ltd. Tête d'enregistrement ayant deux substrats superposés tel que la surface supportant les électrodes de l'un des substrats est face à la surface ne supportant les électrodes de l'autre substrat
EP0457575A2 (fr) * 1990-05-16 1991-11-21 Ngk Insulators, Ltd. Tête d'enregistrement dans laquelle l'arrangement d'électrode d'enregistrement et la feuille d'électrode du circuit retour sont données dur des surfaces opposées respectives du substrat isolé ayant une extrémité distale à paroi mince
EP0457574A3 (en) * 1990-05-16 1992-03-18 Ngk Insulators, Ltd. Recording head having two substrates superposed such that electrode supporting surface of one of the substrates faces non-electrode-supporting surface of the other substrate
EP0457575A3 (en) * 1990-05-16 1992-04-15 Ngk Insulators, Ltd. Recording head wherein recording electrode array and return circuit electrode sheet are provided on respective opposite surfaces of insulating substrate having thin-walled distal end portion
US5231422A (en) * 1990-05-16 1993-07-27 Ngk Insulators, Ltd. Recording head having two substrates superposed such that electrode supporting surface of one of the substrates faces non-electrode-supporting surface of the other substrate

Also Published As

Publication number Publication date
DE68903876T2 (de) 1993-05-19
EP0342995A3 (en) 1990-07-04
EP0342995B1 (fr) 1992-12-16
JPH0248959A (ja) 1990-02-19
DE68903876D1 (de) 1993-01-28

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