JPS57189866A - Thermal printer - Google Patents

Thermal printer

Info

Publication number
JPS57189866A
JPS57189866A JP7493581A JP7493581A JPS57189866A JP S57189866 A JPS57189866 A JP S57189866A JP 7493581 A JP7493581 A JP 7493581A JP 7493581 A JP7493581 A JP 7493581A JP S57189866 A JPS57189866 A JP S57189866A
Authority
JP
Japan
Prior art keywords
typeprinting
platen
voltage
speed
temperature
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
JP7493581A
Other languages
Japanese (ja)
Inventor
Yoshitaka Fujikawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP7493581A priority Critical patent/JPS57189866A/en
Publication of JPS57189866A publication Critical patent/JPS57189866A/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
    • 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

Abstract

PURPOSE:To constantly uniformalize typeprinting density, even when a typeprinting speed is changed, without necessity of adjusting voltage to be charged to a thermal head, by controlling the temperature of a platen in response to the typeprinting speed. CONSTITUTION:A thermal printer utilizes the phenomenum that deep typeprinting density can be obtained, even if voltage to be applied to a thermal head 1 is small, by properly heating a thermal paper sheet 2, running on a platen 3, through the platen. That is, the output voltage of a constant-voltage power source 5 to be applied to a resistance heater 4 arranged in the platen 3 is controlled by a voltage-controlling part 6 which is driven by a signal from a typeprinting speed-detecting part 7, to hold the thermal paper sheet 2 at a proper temperature through the platen 3 (the thermal paper sheet 2 is held at a high temperature when the typeprinting speed is high, while it is held at a low temperature when the typeprinting speed is slow). In addition, a signal from a sensor 8 having detected the temperature of the platen 3 may be utilized to drive the voltage-controlling part 6, so that influence from the change of an atmospheric temperature can be eliminated.
JP7493581A 1981-05-20 1981-05-20 Thermal printer Pending JPS57189866A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7493581A JPS57189866A (en) 1981-05-20 1981-05-20 Thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7493581A JPS57189866A (en) 1981-05-20 1981-05-20 Thermal printer

Publications (1)

Publication Number Publication Date
JPS57189866A true JPS57189866A (en) 1982-11-22

Family

ID=13561699

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7493581A Pending JPS57189866A (en) 1981-05-20 1981-05-20 Thermal printer

Country Status (1)

Country Link
JP (1) JPS57189866A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60143981A (en) * 1983-12-29 1985-07-30 Konishiroku Photo Ind Co Ltd Thermal printer
EP0671276A1 (en) * 1994-03-09 1995-09-13 Agfa-Gevaert N.V. Thermal printer comprising a "real-time" temperature estimation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60143981A (en) * 1983-12-29 1985-07-30 Konishiroku Photo Ind Co Ltd Thermal printer
EP0671276A1 (en) * 1994-03-09 1995-09-13 Agfa-Gevaert N.V. Thermal printer comprising a "real-time" temperature estimation

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