EP0072494B1 - Thermischer Drucker - Google Patents

Thermischer Drucker Download PDF

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Publication number
EP0072494B1
EP0072494B1 EP19820107042 EP82107042A EP0072494B1 EP 0072494 B1 EP0072494 B1 EP 0072494B1 EP 19820107042 EP19820107042 EP 19820107042 EP 82107042 A EP82107042 A EP 82107042A EP 0072494 B1 EP0072494 B1 EP 0072494B1
Authority
EP
European Patent Office
Prior art keywords
resistor
electrodes
data
pieces
thermal head
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
EP19820107042
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English (en)
French (fr)
Other versions
EP0072494A3 (en
EP0072494A2 (de
Inventor
Mitsuyasu 1-506 Koyosokushinjigyo-Taku Takata
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.)
Mitani Electronics Industry Corp
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Mitani Electronics Industry Corp
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Publication date
Application filed by Mitani Electronics Industry Corp filed Critical Mitani Electronics Industry Corp
Publication of EP0072494A2 publication Critical patent/EP0072494A2/de
Publication of EP0072494A3 publication Critical patent/EP0072494A3/en
Application granted granted Critical
Publication of EP0072494B1 publication Critical patent/EP0072494B1/de
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
    • B41J2/35—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 providing current or voltage to the thermal head

Definitions

  • the present invention relates to a thermal head apparatus which can reproduce, print and record picture information transmitted, for example, in a facsimile or the like and, more particularly, to a thermal head apparatus which can reproduce a picture of accurate and high quality on recording paper.
  • a conventional thermal head of this type used to reproduce a picture has a number of heating resistors arranged at an infinitesimal interval along a line extending in a main scanning direction, and electrodes formed on the heating resistors for selectively supplying heating currents to the respective resistors.
  • the thermal head forms a dotted record on a heat-sensitive recording sheet to reproduce a picture, by selectively supplying the heating currents to a number of these heating resistors.
  • transmission information obtained mainly by scanning a picture in its widthwise direction is transmitted from a transmission site.
  • a thermal head at a reception site voltages are then applied to electrodes connected to a number of heating resistors aligned in a main scanning direction on the basis of the transmission information.
  • the thermal head reproduces an image corresponding to the transmission information on recording paper.
  • the recording paper is subscanned in a longitudinal direction with respect to the main scanning direction to thereby reproduce a picture transmitted at the transmission site on the recording paper.
  • thermo head apparatus which comprises:
  • FR-A-2 463 680 and FR-A-2 176 287 already disclose printing apparatuses comprising several parallel rows of printing elements, said rows being staggered to each other by half of the distance of two adjacent printing elements in a row and being supplied from a data control comprising a data memory in a time-delayed relationship respectively.
  • This known principle is also used in the subject matter claimed.
  • this prior art refers to optical and electroerosive printing heads having quite a different constructional design as compared with the thermal head apparatus claimed.
  • first and second resistor strips 14,16 are provided at a predetermined interval in parallel with each other in a main scanning direction (or the crosswise direction of recording paper 12) on an insulating substrate 10 made of, for example, glass or the like.
  • the first and second resistor strips 14,16 constitute a recording heater.
  • the recording paper 12 is moved in a direction designated by an arrow, that is, in a subscanning direction perpendicular to the main scanning direction.
  • the first and second resistors 14, 16 respectively have a length corresponding to the length of the main scanning line, and the interval between the first resistor 14 and the second resistor 16 is set corresponding to the distance which the recording paper 12 moves through the subscanning, during one main scanning period of time.
  • the first and second resistor strips 14, 16 have a plurality of data electrodes 18 1 , 18 2 ,... and 20 1 , 20 2 ,... provided at a predetermined interval in a longitudinal direction to obtain a plurality of resistor pieces, respectively.
  • common electrodes 22 1 , 22 2 ,... and 24 1 , 24 2 ,... are provided between the data electrodes 18 1 , 18 2 ,... and 20 1 , 20 2 ,...
  • the resistor pieces interposed between data electrodes and common electrodes forms one recording unit.
  • the recording units 26 1 , 26 2 ,... and 28 1 , 28 2 ,... are formed along the first and second resistor strips 14, 16.
  • Fig. 2 shows an equivalent circuit of the portion shown in Fig. 1.
  • the portions which are equivalent to those in Fig. 1 are designated by the same reference numerals as those in Fig. 1.
  • the recording units 26 1 , 26 2 ,... on the first resistor strip 4 are displaced by 1/2 of the recording unit width of the recording units 28 1 , 28 2 ,... with respect to the main scanning direction on the second resistor strip 16.
  • the first and second heads 30, 32 extending in the recording-paper crosswise direction are formed of the first and second resistor strips 14, 16 thus constructed.
  • dots 36 1 , 36 2 ,... recorded by the second head 32 are disposed, as shown in Fig. 3, between the dots 34 1 , 34 2 ,... recorded by the first head 30. Therefore, as described above, the interval between the first head 30 and the second head 32 is set corresponding to the distance covered by the moving recording paper during one main scanning period of time.
  • the dots 36 1 , 36 2 ,... recorded by the second head 32 are inserted between the dots 34 1 , 34 2 ,... recorded by the first head 30 to form a line of dots corresponding to one recording scanning line.
  • the unit dot interval in this embodiment is 1/2 that of the conventional device.
  • the recording dot density of this embodiment of the present invention becomes twice that of the conventional one.
  • the first and second heads 30, 32 are so constructed as to record six dots within a range of 1 mm of the recording bands 14, 16.
  • 12 dots are recorded with a range of 1 mm of the resistor bands 14, 16. In this manner, a picture of high density and excellent resolution can be reproduced.
  • Fig. 4 shows a circuit diagram showing the thermal heads 30, 32 shown in Fig. 2 and a drive circuit for driving these thermal heads.
  • the common electrodes 22 1 , 22 2 ,... and 24 1 , 24 2 ,... of the first and second head 30, 32 are alternately connected through isolating diodes 40 1 , 40 2 ,... and 42 1 , 42 2 ,... to common lines C 1 , C 2 , and C 1 ', C 2 ', respectively.
  • Common currents SC1, SC2 and SC1', SC2' of different timings (or different phases) shown in Figs. 5D, 5E, 5G, 5H are supplied to these common lines C,, C 2 , and C 1 ', C 2 '.
  • the bit data D 1 corresponding to the recording dots can be divided into two groups for use.
  • the diodes 40 1 , 40 2 ,... form the first common signal supplying means 41 1
  • the diodes 42 1 , 42 2 ... form the second common signal supplying means 41 2 .
  • the data electrodes 18 1 , 18 2 ,... and 20 1 , 20 2 ,... of the first and second heads 30, 32 are respectively connected to the output terminals of NAND gates 44 1 , 44 2 ,... and 46 1 , 46 2 ,....
  • a strobe signal STR1 shown in Fig. 5F is supplied as a gate signal through a buffer amplifier 48 to one of the input terminals of each of the NAND gates 44 1 , 44 2 ,....
  • a strobe signal STR2 shown in Fig. 51 is supplied as a gate signal through a buffer amplifier 50 to one of the input terminals of each of the NAND gates 46 1 , 46 2 ,....
  • trigger flip-flops 52 1 , 52 2 ,... are supplied to the other input terminals of the NAND gates 44 1 , 44 2 ,....
  • data stored in trigger flip-flops 54 1 , 54 2 ,... are supplied to the other input terminals of the NAND gates 46 1 , 46 2 ,... .
  • the flip-flops 52 1 , 52 2 ,... form a shift register, and bit data D 1 shown in Fig. 5B corresponding to the common current SC1 are sequentially supplied through a buffer amplifier 56 in a serial manner, and the second bit data D 2 shown in Fig. 5B corresponding to the common circuit SC2 are similarly supplied.
  • the flip-flps 54 1 , 54 2 ,... form a shift register, and bit data D 2 corresponding to the common current SC1' shown in Fig. 5C are sequentially supplied in a serial manner, and the second bit data D2 shown in Fig. 5C corresponding to the common current SC2' are similarly supplied.
  • Shift pulses SP1, SP2 are respectively supplied through inverters 60 and 62 to the inverting trigger input terminals of the flip-flops 52 1 , 52 2 ,... and 54 1 , 54 2 ,....
  • the NAND gates 44 1 , 44 2 ,..., flip-flops 52 1 , 52 2 ,... buffer amplifiers 48, 56 and inverter 60 form the first data signal supplying means 61 1 .
  • the NAND gates 46 1 , 46 2 ,... flip-flops 54 1 , 54 2 ,... buffer amplifiers 50, 58 and inverter 62 form the second data signal supplying means 61 2 .
  • the operation of the thermal head thus constructed will now be described.
  • the first head 32 is driven as below.
  • the first recording bit data D1 shown in Fig. 5B are serially supplied to the trigger flip-flops 52 1 , 52 2 ... forming a shift register corresponding to the first head 32.
  • the shift pulse SP1 shown in Fig. 5A is supplied in synchronism with the supply of the data D,.
  • the first recording bit data D are stored in the flip-flops 52 1 , 52 2 ,....
  • a common signal SC1 is supplied to the common line C 1 in this state.
  • the strobe signal STR1 is supplied to the NAND gates 44 1 , 44 2 ,....
  • a current will flow through the resistor pieces, that is, the recording units between the common electrodes 22 1 , 22 2 ,... connected with the common line C 1 and the data electrodes 18 1 , 182,... corresponding to the first recording bit data D 1 , and this portion is thus heated. Consequently, a dot recording is carried out. In this manner, the respective recording units are alternately controlled.
  • the second bit data D 1 shown in Fig. 5B and disposed between the first bit data D 1 are serially supplied to the flip-flops 52 1 , 52 2 ,....
  • the shift pulse SP1 is supplied in synchronism with the supply of the second data D 1 .
  • the second recording bit data D 1 is stored in the flip-flops 52 1 , 52 2 ,....
  • the common signal SC2 is supplied to the common line C 2 .
  • the strobe signal STR1 is supplied to the NAND gates 44 1 , 44 2 ,.... Consequently, a current flows through the resistor piece (recording unit) between the common electrodes 22 1 , 22 2 ,... connected to the common line C 2 and the data electrodes 18 1 , 18 2 ,... corresponding to the second recording bit data D 1 , and this portion is heated. As a result, a dot recording is carried out. In this manner, the recording operation of the first step relative to one main scanning line by the first head 30 is completed.
  • the recording operation is carried out again when the recording paper 12 is subscanned and the second head 32 is moved onto the dotted portion by the first head 30 after the initial recording by the first head 30 is completed.
  • This recording operation is similar to the recording operation of the first head 30.
  • the recording dots made by the second head 32 are formed between the recording dots made by the first head 30 as shown in Fig. 3.
  • Such a thermal head can be effectively formed by a thick film printing technique.
  • respective electrodes are projected and formed as shown in Fig. 1 by the thick film printing on an insulating substrate.
  • resistor strips are so formed as to connect and to cross the respective electrodes as shown in Fig. 1.
  • a hard glass coating layer is formed on the resistor strips including the respective electrodes.
  • the heater portion is so formed as to improve the contact between the heater and the heat-sensitive recording paper, thereby effectively producing the recording dots with the respective recording units.
  • the recording density of a facsimile at present is ordinarily 8 dots per 1 mm
  • the recording density of the first and second heads 30, 32 may be, when the embodiment of this invention is applied thereto, 4 dots per 1 mm. Therefore, the recording unit width or the resistor piece width in the first.and second heads 30, 32 may be sufficiently increased. Accordingly, the fabrication of the heads can be facilitated, and the recording density of the respective recording units can be enhanced.
  • the present invention is not limited to the particular embodiment described above.
  • two sets of heads 30, 32 are employed.
  • three sets of heads may be used.
  • the recording dots are aligned on the same line by the two sets of heads 30, 32.
  • the recording dots may be displaced in subscanning direction.
  • the recording paper is moved.
  • the heads 30, 32 may be moved.

Claims (6)

1. Eine Thermokopf-Vorrichtung mit mehreren Heizwiderständen, die mit infinitesimalem Intervall in einer Hauptabtastrichtung angeordnet sind, um den Widerständen selektiv einen Strom zuzuführen und diese Widerstände aufzuheizen, damit Punkte auf einem Aufzeichnungspapier aufgezeichnet werden, das in einer Hilfsabtastrichtung befördert wird, die senkrecht zu der Hauptabtastrichtung ist, dadurch gekennzeichnet, daß diese Vorrichtung umfaßt:
eine Mehrzahl von durchgehenden Heizwiderstandsbahnen (14, 16), die auf einer Isolatorschicht vorgesehen sind und sich in einer Hauptabtastrichtung parallel zueinander in Abständen in der Hilfsabtastrichtung erstrecken, wobei die Gesamtsumme dieser Abstände so eingestellt ist, daß sie einer Hilfsabtaststrecke während einer Hauptabtastzeitperiode entspricht;
eine Mehrzahl von Elektroden (181, 182,..., 201, 202,..., 221, 222,..., 241, 242,...), die parallel zueinander und senkrecht zu der genannten Mehrzahl von Heizwiderstandsbahnen (24, 26) vorgesehen sind, um die genannten entsprechenden Widerstandsbahnen so zu unterteilen, daß eine Mehrzahl von Widerstandsstücken (261, 262,..., 281, 282,...) gebildet wird, in solcher Weise, daß die genannten Widerstandsstücke (261, 262,..., 281, 282,...), welche zu den entsprechenden Widerstandsbahnen (14, 16) gehören, bezüglich der Hilfsabtastrichtung einander nicht überlagert sind; und
Stromzufuhrmittel (411, 412, 611, 612), die an die genannte Mehrzahl von Elektroden (181, 182,..., 201, 202,..., 221, 222,..., 241, 242,...) angeschlossen sind, um Datenbits zu speichern, welche den Aufzeichnungspunkten entsprechen, um auf der Basis dieser Datenbits Ströme an die Widerstandsstücke (261, 262,..., 281, 282,...) zu liefern, welche zu den entsprechenden Widerstandsbahnen (14, 16) gehören, mit einer Taktsteuerung, welche derart eingestellt ist, daß Ströme zu den Widerstandsstücken (281, 282,...) geliefert werden, wenn eine Reihe von Widerstandsstücken (281, 282,...), welche zu der genannten Widerstandsbahn (16) gehören, über dem punktierten Teil zu liegen kommt, welcher auf dem Aufzeichnungspapier durch eine Reihe von Widerstandsstücken (261, 262,...) aufgezeichnet wurde, die zu der vorhergehenden Widerstandbahn (14) gehört;
wodurch eine Linie von Punkten für die Hauptabtastlinie auf dem Aufzeichnungspapier aufgezeichnet wird, nachdem Ströme allen Widerstandsstücken (261, 262,..., 281, 282,...) zugeführt wurden, welche zu der genannten Mehrzahl von Heizwiderstandsbahnen (14, 16) gehören.
2. Thermokopf-Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die genannte Mehrzahl von Heizwiderstandsbahnen (14, 16) eine erste Heizwiderstandsbahn (14) und eine zweite Heizwiderstandsbahn (16) umfaßt.
3. Thermokopf-Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die genannte Mehrzahl von Elektroden (181, 182,..., 201, 202,..., 221, 222,..., 241, 242,...) eine Mehrzahl von Datenelektroden (181, 182,..., 201, 202,...) und gemeinsame, zwischen diesen Datenelektroden angeordnete Elektroden (221, 222,..., 241, 242,...) umfaßt.
4. Thermokopf-Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Widerstandsstücke (261, 262,...), welche durch die genannten Datenelektroden (181, 182,...) und durch die gemeinsamen Elektroden (221, 222,...) der ersten Heizwiderstandsbahn (14) unterteilt sind, um die Hälfte der Länge eines Widerstandsstücks in einer Hauptabtastrichtung versetzt sind gegenüber den Widerstandsstücken (281, 282,...), welche durch die genannten Datenelektroden (201, 202,...) und die gemeinsamen Elektroden (241, 242,...) der zweiten Heizwiderstandsbahn (16) unterteilt sind.
5. Thermokopf-Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Stromzufuhrmittel (411, 412, 611, 612) sowohl eine gemeinsame Stromzufuhreinrichtung (411, 412) zum Anlegen eines gemeinsamen Stromes an die gemeinsamen Elektroden (221, 222,..., 241, 242,...) und eine Datenzufuhreinrichtung (611, 612) zum Zuführen von Daten an die genannten Datenelektroden (181, 182,..., 201, 202...) umfassen und ferner Ströme an die den Datenbits entsprechenden Widerstandsstücke zwischen den gemeinsamen Elektroden und den Datenelektroden liefern, damit die entsprechenden Widerstandsstücke Wärme erzeugen.
6. Thermokopf-Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die genannte Datenzufuhreinrichtung (611, 612) ein Schieberegister umfaßt.
EP19820107042 1981-08-14 1982-08-04 Thermischer Drucker Expired EP0072494B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP127546/81 1981-08-14
JP12754681A JPS5829685A (ja) 1981-08-14 1981-08-14 サ−マルヘッド装置

Publications (3)

Publication Number Publication Date
EP0072494A2 EP0072494A2 (de) 1983-02-23
EP0072494A3 EP0072494A3 (en) 1985-04-17
EP0072494B1 true EP0072494B1 (de) 1987-03-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820107042 Expired EP0072494B1 (de) 1981-08-14 1982-08-04 Thermischer Drucker

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EP (1) EP0072494B1 (de)
JP (1) JPS5829685A (de)
DE (1) DE3275822D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100867026B1 (ko) * 2001-01-16 2008-11-04 귄터 게엠베하 앤드 코. 메탈베라르바이퉁 가열 러너 노즐 및 다중 노즐 배열체
DE102008036470A1 (de) * 2008-08-05 2010-02-11 Airbus Deutschland Gmbh Flache Flächenleuchte für Be- und Hinterleuchtungsanwendungen mit integrierter Notstromversorgung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459462A (en) * 1982-12-27 1984-07-10 International Business Machines Corporation Drive system for energizing elements of a fixed bar printer
JPS59145161A (ja) * 1983-02-08 1984-08-20 Hitachi Ltd 熱転写プリンタ
JPS6036177A (ja) * 1983-08-10 1985-02-25 Hitachi Ltd 感熱プリンタ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2176287A5 (de) * 1972-03-17 1973-10-26 Bertin & Cie
US4284876A (en) * 1979-04-24 1981-08-18 Oki Electric Industry Co., Ltd. Thermal printing system
JPS5630154A (en) * 1979-08-21 1981-03-26 Oki Electric Ind Co Ltd Photoprint head
JPS5829684A (ja) * 1981-08-13 1983-02-21 Rohm Co Ltd サ−マルプリンタヘツド

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100867026B1 (ko) * 2001-01-16 2008-11-04 귄터 게엠베하 앤드 코. 메탈베라르바이퉁 가열 러너 노즐 및 다중 노즐 배열체
DE102008036470A1 (de) * 2008-08-05 2010-02-11 Airbus Deutschland Gmbh Flache Flächenleuchte für Be- und Hinterleuchtungsanwendungen mit integrierter Notstromversorgung

Also Published As

Publication number Publication date
DE3275822D1 (en) 1987-04-30
EP0072494A3 (en) 1985-04-17
JPS5829685A (ja) 1983-02-21
EP0072494A2 (de) 1983-02-23

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