JPS5627372A - Thermal printer - Google Patents

Thermal printer

Info

Publication number
JPS5627372A
JPS5627372A JP10264379A JP10264379A JPS5627372A JP S5627372 A JPS5627372 A JP S5627372A JP 10264379 A JP10264379 A JP 10264379A JP 10264379 A JP10264379 A JP 10264379A JP S5627372 A JPS5627372 A JP S5627372A
Authority
JP
Japan
Prior art keywords
thermal head
printing
temperature
circuit
signal
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
JP10264379A
Other languages
Japanese (ja)
Inventor
Katsuhiko Inoue
Soichiro Miyano
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP10264379A priority Critical patent/JPS5627372A/en
Publication of JPS5627372A publication Critical patent/JPS5627372A/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
    • B41J2/365—Print density control by compensation for variation in temperature

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To obtain the captioned device whereby the shading of printed letters under the influence of the ambient temperature of a thermal head can be eliminated by adding a preliminarily-heating circuit for the thermal head and thereby keeping the thermal head at higher temperature than the ambient. CONSTITUTION:When an inversion signal for a printing signal and a certain repetition signal therefor being inputted, a driving circuit is turned on by the printing signal from a control circuit 4, prepared by an AND circuit, and thereby the thermal head 1 is electrified for printing. While the printing is not performed, the transistor Q0 of a preliminarily-heating circuit 3 for the thermal head is turned on by an AND output from the control circuit 4 to electrify the thermal head through a resister R and a diode D, thus the thermal head 1 being kept at higher temperature than the ambient temperature. This temperature of the thermal head can be set easily at an optional value lower than the heat-sensing temperature of the heat-sensitive paper for the printer by increasing or decreasing a supply current through adjustment of the resister R.
JP10264379A 1979-08-10 1979-08-10 Thermal printer Pending JPS5627372A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10264379A JPS5627372A (en) 1979-08-10 1979-08-10 Thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10264379A JPS5627372A (en) 1979-08-10 1979-08-10 Thermal printer

Publications (1)

Publication Number Publication Date
JPS5627372A true JPS5627372A (en) 1981-03-17

Family

ID=14332911

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10264379A Pending JPS5627372A (en) 1979-08-10 1979-08-10 Thermal printer

Country Status (1)

Country Link
JP (1) JPS5627372A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5849279A (en) * 1981-09-18 1983-03-23 Hitachi Ltd Preheating pulse control circuit for heat-sensitive recording
JPS6375344U (en) * 1987-10-19 1988-05-19

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5849279A (en) * 1981-09-18 1983-03-23 Hitachi Ltd Preheating pulse control circuit for heat-sensitive recording
JPS6375344U (en) * 1987-10-19 1988-05-19

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