JPS5638279A - Thermal recording device - Google Patents

Thermal recording device

Info

Publication number
JPS5638279A
JPS5638279A JP11388879A JP11388879A JPS5638279A JP S5638279 A JPS5638279 A JP S5638279A JP 11388879 A JP11388879 A JP 11388879A JP 11388879 A JP11388879 A JP 11388879A JP S5638279 A JPS5638279 A JP S5638279A
Authority
JP
Japan
Prior art keywords
resistance
measuring
thermal head
recording device
circuit
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
JP11388879A
Other languages
Japanese (ja)
Inventor
Tetsunori Sawae
Hiromi Yamashita
Takafumi Endo
Toshio Hida
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP11388879A priority Critical patent/JPS5638279A/en
Publication of JPS5638279A publication Critical patent/JPS5638279A/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
    • B41J2/37—Print density control by compensation for variation in current

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To print in a constant density by providing a means for measuring the resistance of a predetermined section in the thermal head and a means for controlling the energy applied to each resistance element, in accordance with the measured value, so as to maintain the energy at a fixed level, in the titled recording device. CONSTITUTION:The thermal head 1 of the thermal recording device used for facsimiles, printers and the like consists of an insulated substrate 2, resistance heating elements 3 arranged in a line, etc. The measuring terminals 8a, 8b for measuring the resistance are fitted at both ends of the line of the resistance heating elements 3 in the device, and a measuring circuit 9 is provided for measuring the resistance Rab between the measuring terminals 8a, 8b. Further, an output controlling circuit 10 is provided for controlling the pulse voltage of the picture bit data outputted from a register 7, in accordance with the resistance Rab measured by the circuit 9, so as to maintain the energy of the recording pulse impressed on the resistance elements 3 at a fixed level. Accordingly, a constant recording density can be obtained and the use life of the thermal head can be elongated.
JP11388879A 1979-09-05 1979-09-05 Thermal recording device Pending JPS5638279A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11388879A JPS5638279A (en) 1979-09-05 1979-09-05 Thermal recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11388879A JPS5638279A (en) 1979-09-05 1979-09-05 Thermal recording device

Publications (1)

Publication Number Publication Date
JPS5638279A true JPS5638279A (en) 1981-04-13

Family

ID=14623636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11388879A Pending JPS5638279A (en) 1979-09-05 1979-09-05 Thermal recording device

Country Status (1)

Country Link
JP (1) JPS5638279A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59136270A (en) * 1983-01-26 1984-08-04 Fujitsu Kiden Ltd Correction of resistance value of heat-sensitive printing head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59136270A (en) * 1983-01-26 1984-08-04 Fujitsu Kiden Ltd Correction of resistance value of heat-sensitive printing head

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