JPS57176184A - Power supply circuit for thermal printer - Google Patents

Power supply circuit for thermal printer

Info

Publication number
JPS57176184A
JPS57176184A JP56062749A JP6274981A JPS57176184A JP S57176184 A JPS57176184 A JP S57176184A JP 56062749 A JP56062749 A JP 56062749A JP 6274981 A JP6274981 A JP 6274981A JP S57176184 A JPS57176184 A JP S57176184A
Authority
JP
Japan
Prior art keywords
printing
gate
elements
transistors
pulse
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
JP56062749A
Other languages
Japanese (ja)
Inventor
Hitoshi Minami
Yuki Ninomiya
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.)
Pentel Co Ltd
Original Assignee
Pentel 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 Pentel Co Ltd filed Critical Pentel Co Ltd
Priority to JP56062749A priority Critical patent/JPS57176184A/en
Publication of JPS57176184A publication Critical patent/JPS57176184A/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
    • 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
    • B41J2/365—Print density control by compensation for variation in temperature

Abstract

PURPOSE:To eliminate variations in printing density and to improve printing quality by a method wherein heating temperature of heating elements is made different between while non-printing and while printing. CONSTITUTION:A printing signal in response to one cycle of reference clock pulses A is input to each input terminal 6 of a gate 2 so as to control on-and-off operation of transistors Tr1-n which are serially connected to heating elements H1-n, respectively. Respective output terminals of the gate 2 come into the floating state when an output terminal of an inverter 4 assumes a high level, i.e., when the pulse A is low, so that the transistors Tr1-n are turned on and a minute current from FET is supplied to the elements H1-n thereby to preheat them. When both the pulse A and the signal B are high, the output terminals of the gate 2 become high. At this time, since the FET is conducted, source voltage VCC is applied to the elements H1-n directly and temperature of heat-sensitive paper is raised up to such a level that it develops color. When the pulse A is high and the signal B is low, the output terminals of the gate 2 become low. In this state, the transistors Tr1-n are not conducted and the elements H1-n are supplied with no power and hence not heated.
JP56062749A 1981-04-24 1981-04-24 Power supply circuit for thermal printer Pending JPS57176184A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56062749A JPS57176184A (en) 1981-04-24 1981-04-24 Power supply circuit for thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56062749A JPS57176184A (en) 1981-04-24 1981-04-24 Power supply circuit for thermal printer

Publications (1)

Publication Number Publication Date
JPS57176184A true JPS57176184A (en) 1982-10-29

Family

ID=13209356

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56062749A Pending JPS57176184A (en) 1981-04-24 1981-04-24 Power supply circuit for thermal printer

Country Status (1)

Country Link
JP (1) JPS57176184A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4828407A (en) * 1987-05-29 1989-05-09 Sanders Associates, Inc. Circuit for improving the resolution in electrostatic printers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5617277A (en) * 1979-07-18 1981-02-19 Ibm Thermallprinter
JPS5677172A (en) * 1979-11-28 1981-06-25 Hitachi Ltd Driving circuit for thermal printer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5617277A (en) * 1979-07-18 1981-02-19 Ibm Thermallprinter
JPS5677172A (en) * 1979-11-28 1981-06-25 Hitachi Ltd Driving circuit for thermal printer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4828407A (en) * 1987-05-29 1989-05-09 Sanders Associates, Inc. Circuit for improving the resolution in electrostatic printers

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