JPS5677172A - Driving circuit for thermal printer - Google Patents

Driving circuit for thermal printer

Info

Publication number
JPS5677172A
JPS5677172A JP15295679A JP15295679A JPS5677172A JP S5677172 A JPS5677172 A JP S5677172A JP 15295679 A JP15295679 A JP 15295679A JP 15295679 A JP15295679 A JP 15295679A JP S5677172 A JPS5677172 A JP S5677172A
Authority
JP
Japan
Prior art keywords
condenser
thermogenous
transistor
printing
charged
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
JP15295679A
Other languages
Japanese (ja)
Inventor
Hiroshi Uehara
Haruo Fukuchi
Kyugo Nakamura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15295679A priority Critical patent/JPS5677172A/en
Publication of JPS5677172A publication Critical patent/JPS5677172A/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

Abstract

PURPOSE:To keep power current constant by driving a thermogenous element by voltage charged in a condenser as well as correct the rise of temperature due to self thermogenesis and make the concentration of printing uniform by gradually lowering applied voltage in case where driving is continued. CONSTITUTION:A switch circuit (transistor) Tr operating according to printing signal is connected in series with a thermogenous element RT, and in parallel with these, an element R2 to charge a condenser 12 is provided. When the transistor Tr is off, no current flows in the thermogenous resistor RT and the condenser 12 is charged through a resistance R2 which is one of charging elements. In case where printing pulse signal 10 is continued, the values of its capacity and the resistance R2 are selected so that the condenser 12 is insufficiently charged during the off- period of the transistor Tr.
JP15295679A 1979-11-28 1979-11-28 Driving circuit for thermal printer Pending JPS5677172A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15295679A JPS5677172A (en) 1979-11-28 1979-11-28 Driving circuit for thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15295679A JPS5677172A (en) 1979-11-28 1979-11-28 Driving circuit for thermal printer

Publications (1)

Publication Number Publication Date
JPS5677172A true JPS5677172A (en) 1981-06-25

Family

ID=15551830

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15295679A Pending JPS5677172A (en) 1979-11-28 1979-11-28 Driving circuit for thermal printer

Country Status (1)

Country Link
JP (1) JPS5677172A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176184A (en) * 1981-04-24 1982-10-29 Pentel Kk Power supply circuit for thermal printer
JPS58117942U (en) * 1982-02-03 1983-08-11 ソニー株式会社 thermal printer
JPS58138666A (en) * 1982-02-12 1983-08-17 Fuji Xerox Co Ltd Driving device for heat-sensitive recording head
DE3327904A1 (en) * 1982-08-05 1984-02-09 Canon K.K., Tokyo THERMAL RECORDING DEVICE

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176184A (en) * 1981-04-24 1982-10-29 Pentel Kk Power supply circuit for thermal printer
JPS58117942U (en) * 1982-02-03 1983-08-11 ソニー株式会社 thermal printer
JPS58138666A (en) * 1982-02-12 1983-08-17 Fuji Xerox Co Ltd Driving device for heat-sensitive recording head
DE3327904A1 (en) * 1982-08-05 1984-02-09 Canon K.K., Tokyo THERMAL RECORDING DEVICE

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