JPS57107867A - Thermal printer - Google Patents

Thermal printer

Info

Publication number
JPS57107867A
JPS57107867A JP18283880A JP18283880A JPS57107867A JP S57107867 A JPS57107867 A JP S57107867A JP 18283880 A JP18283880 A JP 18283880A JP 18283880 A JP18283880 A JP 18283880A JP S57107867 A JPS57107867 A JP S57107867A
Authority
JP
Japan
Prior art keywords
voltage
driving
thermal
accordance
given
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.)
Pending
Application number
JP18283880A
Other languages
Japanese (ja)
Inventor
Norio Shimoyama
Kanji Nagai
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP18283880A priority Critical patent/JPS57107867A/en
Publication of JPS57107867A publication Critical patent/JPS57107867A/en
Pending legal-status Critical Current

Links

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
    • B41J2/355—Control circuits for heating-element selection
    • B41J2/36—Print density control

Landscapes

  • Electronic Switches (AREA)
  • Facsimile Heads (AREA)

Abstract

PURPOSE:To make uniform the printing density of the thermal printer and to improve thereby the quality of printing by setting the time of driving in accordance with the thermal hysteresis of the thermal head. CONSTITUTION:Driving selection signals RD1-RDN for the thermal head are inputted in a discharging-charging circuit consisting of resistors R1, R2, a capacitor C1 and a group of diodes, while a voltage in accordance with the thermal hysteresis of the thermal head is generated therein and memorized, and the voltage at a point (a) is raised or lowered in accordance with intervals of impression of the driving selection signals and with numbers thereof rendered simultaneously. The voltage at the point (a) is supplied as a modulating signal to the controlled voltage terminal CV of a timer TM and subjected to a threshold control, whereby the width of an output pulse OUT is modulated. Meanwhile, when even one of the signals RD1-RDN is suplied, the output of a NAND gate NG turns ''1'', the timer TM is started by a trigger pulse TG given thereto from a differential circuit TGC, the output pulse OUT according to the voltage at the point (a) to be given to CV is delivered therefrom, and this output pulse is given as a driving gate signal GS to driving gates G1-GN through the intermediary of an inverter IV2.
JP18283880A 1980-12-25 1980-12-25 Thermal printer Pending JPS57107867A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18283880A JPS57107867A (en) 1980-12-25 1980-12-25 Thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18283880A JPS57107867A (en) 1980-12-25 1980-12-25 Thermal printer

Publications (1)

Publication Number Publication Date
JPS57107867A true JPS57107867A (en) 1982-07-05

Family

ID=16125338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18283880A Pending JPS57107867A (en) 1980-12-25 1980-12-25 Thermal printer

Country Status (1)

Country Link
JP (1) JPS57107867A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922773A (en) * 1982-07-30 1984-02-06 Canon Inc Thermal printer
JPS59176070A (en) * 1983-03-28 1984-10-05 Fujitsu Ltd Driving device for heating element group

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922773A (en) * 1982-07-30 1984-02-06 Canon Inc Thermal printer
JPS59176070A (en) * 1983-03-28 1984-10-05 Fujitsu Ltd Driving device for heating element group

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