JPS5557482A - Thermal recording device - Google Patents

Thermal recording device

Info

Publication number
JPS5557482A
JPS5557482A JP13199178A JP13199178A JPS5557482A JP S5557482 A JPS5557482 A JP S5557482A JP 13199178 A JP13199178 A JP 13199178A JP 13199178 A JP13199178 A JP 13199178A JP S5557482 A JPS5557482 A JP S5557482A
Authority
JP
Japan
Prior art keywords
time
heat
generating element
becomes
capacitor
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
JP13199178A
Other languages
Japanese (ja)
Inventor
Susumu Sugiura
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 JP13199178A priority Critical patent/JPS5557482A/en
Publication of JPS5557482A publication Critical patent/JPS5557482A/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 a heat-generating element from being damaged, in case if the heat-generating element was impressed with a signal for operating longer than a prescribed period of time, by disconnecting the power supply after a fixed period of time by a time constant circuit. CONSTITUTION:When a heat-generating element 26 started driving, a transistor 33 becomes OFF and a capacitor 35 starts being charged. As a capacitor 35's terminal voltage is lower than a comparator 36's basic voltage, a transistor 38 is kept in OFF position until a set time T elapses, and a signal wire 30 is kept on a high level. During this time, the heat-generating body is electrified and generating heat. If a driving signal is continued longer than the prescribed time and becomes more than the time T, the capacitor 35's terminal voltage becomes higher than the basic voltage, and an high output is issued from the comparator 36 to turn the transistor ON. And therefore, the signal wire 30 becomes down to a low level and the power supply to the heat-generating element 26 is stopped.
JP13199178A 1978-10-26 1978-10-26 Thermal recording device Pending JPS5557482A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13199178A JPS5557482A (en) 1978-10-26 1978-10-26 Thermal recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13199178A JPS5557482A (en) 1978-10-26 1978-10-26 Thermal recording device

Publications (1)

Publication Number Publication Date
JPS5557482A true JPS5557482A (en) 1980-04-28

Family

ID=15070991

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13199178A Pending JPS5557482A (en) 1978-10-26 1978-10-26 Thermal recording device

Country Status (1)

Country Link
JP (1) JPS5557482A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58132574A (en) * 1982-02-02 1983-08-06 Mitsubishi Electric Corp Driving circuit of thermal head
JPS58177380A (en) * 1982-04-09 1983-10-18 Matsushita Graphic Commun Syst Inc Heat-sensitive recorder
JPS5929175A (en) * 1982-08-09 1984-02-16 Canon Inc Apparatus for controlling printing of thermal head
JPS59153239U (en) * 1983-03-31 1984-10-15 サンデン株式会社 Thermal head burnout prevention device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58132574A (en) * 1982-02-02 1983-08-06 Mitsubishi Electric Corp Driving circuit of thermal head
JPS58177380A (en) * 1982-04-09 1983-10-18 Matsushita Graphic Commun Syst Inc Heat-sensitive recorder
JPS5929175A (en) * 1982-08-09 1984-02-16 Canon Inc Apparatus for controlling printing of thermal head
JPS59153239U (en) * 1983-03-31 1984-10-15 サンデン株式会社 Thermal head burnout prevention device

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