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EP0072494A2 - Thermischer Drucker - Google Patents

Thermischer Drucker Download PDF

Info

Publication number
EP0072494A2
EP0072494A2 EP82107042A EP82107042A EP0072494A2 EP 0072494 A2 EP0072494 A2 EP 0072494A2 EP 82107042 A EP82107042 A EP 82107042A EP 82107042 A EP82107042 A EP 82107042A EP 0072494 A2 EP0072494 A2 EP 0072494A2
Authority
EP
European Patent Office
Prior art keywords
resistor
electrodes
pieces
data
main scanning
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
EP82107042A
Other languages
English (en)
French (fr)
Other versions
EP0072494A3 (en
EP0072494B1 (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
Original Assignee
Mitani Electronics Industry 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
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:
  • 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 181, 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 221, 222, ... and 241, 24 2 , ... are provided between the data electrodes 18 1 , 18 2 , ... and 20 1 , 20 2 , ...
  • the resistor piece interposed between data electrodes and common electrodes forms one recording unit.
  • the recording units 261, 26 2 , ... and 28 1 , 28 2 , ... are formed along the first and second resistor strips 14, 16.
  • F ig. 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 261, 262, ... on the first resistor strip 14 are displaced by 1/2 of the recording unit width of the recording units 281, 282, ... 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 361, 36 2 , ... recorded by the second head 32 are disposed, as shown in Fig. 3, between the dots 341, 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 perio'd of time.
  • the dots 36 1 , 36 2 , ... recorded by the second head 32 are inserted between the dots 341, 342, ... recorded by the first head 30 to form a line of dots corresponding to one recording scannling 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 221, 22 2 , ... and 24 1 , 24 2 , ... of the first and second head 30, 32 are alternately connected through isolating diodes 401, 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 Cl, C 2 , and C l ', C 2 '.
  • the bit data Dl corresponding to the recording dots can be divided into two groups for use.
  • the diodes 401, 40 2 , ... form the first common signal supplying means 41 1
  • the diodes 42 1 , 42 2 , ... form the second common signal supplying means 412.
  • the data electrodes 181, 18 2 , ... and 201, 20 2 , ... of the first and second heads 30, 32 are respectively connected to the output terminals of NAND gates 441, 442, ... and 461, 462, ....
  • a strobe signal STRl 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. 5I is supplied as a gate signal through a buffer amplifier 50 to one of the input terminals of each of the NAND gates 461, 46 2 , ....
  • trigger flip-flops 521, 52 2 , ... are supplied to the other input terminals of the NAND gates 441, 44 2 , ....
  • data stored in trigger flip-flops 54 1 , 54 2 , ... are supplied to the other input terminals of the NAND gates 461, 462, ....
  • the flip-flops 521, 52 2 , ... form a shift register, and bit data Dl 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-flops 541, 542, ... form a shift register, and bit data D2 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 SPl, SP2 are respectively supplied through inverters 60 and 62 to the inverting trigger input terminals of the flip-flops 521, 52 2 , ... and 54 1 , 542, ....
  • the NAND gates 441, 442, ..., flip-flops 521, 52 2 , ... buffer amplifiers 48, 56 and inverter 60 form the first data signal supplying means 61 1 .
  • the NAND gates 461, 462, ... 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 Dl shown in Fig. 5B are serially supplied to the trigger flip-flops 521, 52 2 , ... forming a shift register corresponding to the first head 32.
  • the shift pulse SPl shown in Fig. 5A is supplied in synchronism with the supply of the data Dl.
  • the first recording bit data Dl are stored in the flip-flops 521, 52 2 , ....
  • a common signal SC1 is supplied to the common line Cl in this state.
  • the strobe signal STR1 is supplied to the NAND gates 441, 442, ....
  • a current will flow through the resistor pieces, that is, the recording units between the common electrodes 221, 222, ... connected with the common line Cl and the data electrodes 181, 182, ... corresponding to the first recording bit data Dl, 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 Dl shown in Fig. 5B and disposed between the first bit data Dl are serially supplied to the flip-flops 521, 52 2 , ....
  • the shift pulse SP1 is supplied in synchronism with the supply of the second data Dl.
  • the second recording bit data Dl is stored in the flip-flops 52 1 , 522, .. ..
  • the common signal SC2 is supplied to the common line C2.
  • 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 181, 182, ... corresponding to the second recording bit data Dl, 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 alinged 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.

Landscapes

  • Electronic Switches (AREA)
  • Facsimile Heads (AREA)
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 true EP0072494A2 (de) 1983-02-23
EP0072494A3 EP0072494A3 (en) 1985-04-17
EP0072494B1 EP0072494B1 (de) 1987-03-25

Family

ID=14962676

Family Applications (1)

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

Country Status (3)

Country Link
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
EP0115841A2 (de) * 1983-02-08 1984-08-15 Hitachi, Ltd. Thermischer Drucker
EP0134022A2 (de) * 1983-08-10 1985-03-13 Hitachi, Ltd. Wärmedrucker

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
DE20100840U1 (de) * 2001-01-16 2001-04-05 Günther GmbH & Co. KG Metallverarbeitung, 35066 Frankenberg Heißkanaldüse
DE102008036470A1 (de) * 2008-08-05 2010-02-11 Airbus Deutschland Gmbh Flache Flächenleuchte für Be- und Hinterleuchtungsanwendungen mit integrierter Notstromversorgung

Citations (3)

* 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
EP0018762A1 (de) * 1979-04-24 1980-11-12 Oki Electric Industry Company, Limited Thermischer Druckapparat
FR2463680A1 (fr) * 1979-08-21 1981-02-27 Oki Electric Ind Co Ltd Tete d'impression optique pour des imprimantes optiques

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5829684A (ja) * 1981-08-13 1983-02-21 Rohm Co Ltd サ−マルプリンタヘツド

Patent Citations (3)

* 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
EP0018762A1 (de) * 1979-04-24 1980-11-12 Oki Electric Industry Company, Limited Thermischer Druckapparat
FR2463680A1 (fr) * 1979-08-21 1981-02-27 Oki Electric Ind Co Ltd Tete d'impression optique pour des imprimantes optiques

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0115841A2 (de) * 1983-02-08 1984-08-15 Hitachi, Ltd. Thermischer Drucker
EP0115841A3 (en) * 1983-02-08 1985-07-24 Hitachi, Ltd. Thermal printer
EP0134022A2 (de) * 1983-08-10 1985-03-13 Hitachi, Ltd. Wärmedrucker
EP0134022A3 (en) * 1983-08-10 1985-07-17 Hitachi, Ltd. Thermal printer

Also Published As

Publication number Publication date
EP0072494A3 (en) 1985-04-17
DE3275822D1 (en) 1987-04-30
JPS5829685A (ja) 1983-02-21
EP0072494B1 (de) 1987-03-25

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