JPS57144774A - Heat generating/recording elements driving circuit - Google Patents

Heat generating/recording elements driving circuit

Info

Publication number
JPS57144774A
JPS57144774A JP56029423A JP2942381A JPS57144774A JP S57144774 A JPS57144774 A JP S57144774A JP 56029423 A JP56029423 A JP 56029423A JP 2942381 A JP2942381 A JP 2942381A JP S57144774 A JPS57144774 A JP S57144774A
Authority
JP
Japan
Prior art keywords
heat generating
printing
output
elements
transistor
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
JP56029423A
Other languages
Japanese (ja)
Inventor
Sakae Horyu
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP56029423A priority Critical patent/JPS57144774A/en
Publication of JPS57144774A publication Critical patent/JPS57144774A/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
    • B41J2/375—Protection arrangements against overheating

Abstract

PURPOSE:To prevent damage to a heating element with a reduced power consumption by closing a switching means only when printing signals are output while the switching means is provided between heating elements of a heat generating/recording element driving circuit and a power supply source. CONSTITUTION:When a printing signal ''1'' is output to an output terminal T1 of a CPU, a transistor TRS2 conducts and a voltage of a constant voltage circuit REG is applied to heat generating/recording elements TH1-THN. At the same time, the printing signal is provided to a transistor TR1 through an amplification circuit AMP1 and with the conducting of the transistor TR1, a current follows to the heat generating/recording element TH1 to perform a printing. In this case, only when the printing signal ''1'' is output, current flows through amplification circuits AMP1-AMPN thereby lessening power consumption. In addition, current fails to flow through heat generating elements except for the printing period regardless of breakage of the transistors TR1-TRN thereby preventing possible damage to the elements.
JP56029423A 1981-03-03 1981-03-03 Heat generating/recording elements driving circuit Pending JPS57144774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56029423A JPS57144774A (en) 1981-03-03 1981-03-03 Heat generating/recording elements driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56029423A JPS57144774A (en) 1981-03-03 1981-03-03 Heat generating/recording elements driving circuit

Publications (1)

Publication Number Publication Date
JPS57144774A true JPS57144774A (en) 1982-09-07

Family

ID=12275714

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56029423A Pending JPS57144774A (en) 1981-03-03 1981-03-03 Heat generating/recording elements driving circuit

Country Status (1)

Country Link
JP (1) JPS57144774A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01139270A (en) * 1987-11-26 1989-05-31 Canon Inc Ink jet recording apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01139270A (en) * 1987-11-26 1989-05-31 Canon Inc Ink jet recording apparatus

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