JPS5780079A - Drive means for thermal head - Google Patents

Drive means for thermal head

Info

Publication number
JPS5780079A
JPS5780079A JP15723880A JP15723880A JPS5780079A JP S5780079 A JPS5780079 A JP S5780079A JP 15723880 A JP15723880 A JP 15723880A JP 15723880 A JP15723880 A JP 15723880A JP S5780079 A JPS5780079 A JP S5780079A
Authority
JP
Japan
Prior art keywords
inputted
thermal head
current
count value
inputting terminal
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
JP15723880A
Other languages
Japanese (ja)
Inventor
Shinzo Shimomura
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.)
Shinko Electric Co Ltd
Original Assignee
Shinko Electric 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 Shinko Electric Co Ltd filed Critical Shinko Electric Co Ltd
Priority to JP15723880A priority Critical patent/JPS5780079A/en
Publication of JPS5780079A publication Critical patent/JPS5780079A/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

Landscapes

  • Electronic Switches (AREA)
  • Facsimile Heads (AREA)

Abstract

PURPOSE:To eliminate unevenness in print density while reducing outer circuits to the minimal possible rate, by counting the number of current-applied elements of a thermal head, and changing a current-applying period to the thermal head in accordance with the number. CONSTITUTION:The same signal as a input to a shift resistor is inputted into the data-inputting terminal D and the clock-inputting terminal CK of a counter 4, to count how many ON signals are inputted from Darlington transitor. The count value is inputted into a control circuit 5, so that the ON period of a transistor Tr in a common drive circuit 2 is elongated or shortened in response to the inputted count value. By said control, the temperature of a heating element can be regularized.
JP15723880A 1980-11-07 1980-11-07 Drive means for thermal head Pending JPS5780079A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15723880A JPS5780079A (en) 1980-11-07 1980-11-07 Drive means for thermal head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15723880A JPS5780079A (en) 1980-11-07 1980-11-07 Drive means for thermal head

Publications (1)

Publication Number Publication Date
JPS5780079A true JPS5780079A (en) 1982-05-19

Family

ID=15645260

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15723880A Pending JPS5780079A (en) 1980-11-07 1980-11-07 Drive means for thermal head

Country Status (1)

Country Link
JP (1) JPS5780079A (en)

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