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JPS57102375A - Thermal printer - Google Patents

Thermal printer

Info

Publication number
JPS57102375A
JPS57102375A JP55178851A JP17885180A JPS57102375A JP S57102375 A JPS57102375 A JP S57102375A JP 55178851 A JP55178851 A JP 55178851A JP 17885180 A JP17885180 A JP 17885180A JP S57102375 A JPS57102375 A JP S57102375A
Authority
JP
Japan
Prior art keywords
value
limit value
counter
comparator
upper limit
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
JP55178851A
Other languages
Japanese (ja)
Inventor
Kenichiro 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 JP55178851A priority Critical patent/JPS57102375A/en
Publication of JPS57102375A publication Critical patent/JPS57102375A/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

Landscapes

  • Electronic Switches (AREA)
  • Fax Reproducing Arrangements (AREA)

Abstract

PURPOSE:To improve the quality of a type by controlling the heating time in response to the accumulation of heat of a thermal head, thereby maintaining approximately the temperature of the head constant. CONSTITUTION:A heating time counter 7 is set to the upper limit value X via a heating time comparator 8 according to a signal line l1 from a mechanism controlling driver 3 at the time of starting a type (and accordingly the dot row of a type line head is heated for the time X). Thereafter, the comparator 5 judges the presence or absence of the dots of a pattern register 4. When no dot is found, the positive value of the addition or subtraction constant N is produced to an adder 6. When the dots are found, the negative value of the constant N is produced to the adder 6. Thus, the value obtained by adding it to the value from a counter 7 is set to the counter 7 (however, when the value obtained from the comparator 8 exceeds the upper limit value X or lower limit value Y, the upper limit value X or lower limit value Y is set to the counter 7). Accordingly, since the thermal head 10 is heated to the temperature controlled via a driver, typing of high quality can be performed.
JP55178851A 1980-12-19 1980-12-19 Thermal printer Pending JPS57102375A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55178851A JPS57102375A (en) 1980-12-19 1980-12-19 Thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55178851A JPS57102375A (en) 1980-12-19 1980-12-19 Thermal printer

Publications (1)

Publication Number Publication Date
JPS57102375A true JPS57102375A (en) 1982-06-25

Family

ID=16055777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55178851A Pending JPS57102375A (en) 1980-12-19 1980-12-19 Thermal printer

Country Status (1)

Country Link
JP (1) JPS57102375A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63185655A (en) * 1987-01-29 1988-08-01 Canon Inc Driving method for recording head
JPS63227357A (en) * 1986-10-30 1988-09-21 Nec Corp Printing control method of thermal printer
EP0506016A2 (en) * 1991-03-25 1992-09-30 Mitsubishi Denki Kabushiki Kaisha Improved method and circuit for historical control of thermal printing
US5444464A (en) * 1992-01-20 1995-08-22 Mitsubishi Denki Kabushiki Kaisha Thermal printer head driving circuit with thermal history based control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63227357A (en) * 1986-10-30 1988-09-21 Nec Corp Printing control method of thermal printer
JPS63185655A (en) * 1987-01-29 1988-08-01 Canon Inc Driving method for recording head
EP0506016A2 (en) * 1991-03-25 1992-09-30 Mitsubishi Denki Kabushiki Kaisha Improved method and circuit for historical control of thermal printing
US5377159A (en) * 1991-03-25 1994-12-27 Mitsubishi Denki Kabushiki Kaisha Improved method and circuit for historical control of thermal printing
US5444464A (en) * 1992-01-20 1995-08-22 Mitsubishi Denki Kabushiki Kaisha Thermal printer head driving circuit with thermal history based control

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