JPS54139559A - Heat biasing system in thermographic head - Google Patents

Heat biasing system in thermographic head

Info

Publication number
JPS54139559A
JPS54139559A JP4646178A JP4646178A JPS54139559A JP S54139559 A JPS54139559 A JP S54139559A JP 4646178 A JP4646178 A JP 4646178A JP 4646178 A JP4646178 A JP 4646178A JP S54139559 A JPS54139559 A JP S54139559A
Authority
JP
Japan
Prior art keywords
resistance element
heating resistance
heating
bias
driving
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
JP4646178A
Other languages
Japanese (ja)
Inventor
Hidekazu Hara
Hideo Iwamoto
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 JP4646178A priority Critical patent/JPS54139559A/en
Publication of JPS54139559A publication Critical patent/JPS54139559A/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)

Abstract

PURPOSE:To prevent the decrease in the density of recording images at heating resistance element block boundaries by simultaneously heating-driving the other heating resistance elements positioned closest to the heating resistance element blocks being heating-driven to the extent that thermographing is not accomplished. CONSTITUTION:Bias resistances 18, 20 and bias diodes 19, 21 are inserted between the driving leads 507, 508 of the heating resistance element block 15 connected to common wires 111, 112 and the driving leads 509, 510 at the end of the heating resistance element block 16 connected to common wires 113, 114. Bias resistances 22, 24 and bias diodes 23, 25 are inserted between the driving leads 515, 516 and driving leads 517, 518, between the heating resistance element blocks 16, 17. This makes it possible to flow bias current simultaneously to the heating elements adjoining to the respective heating resistance element blocks to be thermographed now and let heat be evolved up to the temperature at which recording does not take place.
JP4646178A 1978-04-21 1978-04-21 Heat biasing system in thermographic head Pending JPS54139559A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4646178A JPS54139559A (en) 1978-04-21 1978-04-21 Heat biasing system in thermographic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4646178A JPS54139559A (en) 1978-04-21 1978-04-21 Heat biasing system in thermographic head

Publications (1)

Publication Number Publication Date
JPS54139559A true JPS54139559A (en) 1979-10-30

Family

ID=12747795

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4646178A Pending JPS54139559A (en) 1978-04-21 1978-04-21 Heat biasing system in thermographic head

Country Status (1)

Country Link
JP (1) JPS54139559A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432001A (en) * 1981-01-16 1984-02-14 Fuji Xerox Co., Ltd. Heat-sensitive recording head driving method
JPS6145672A (en) * 1984-08-10 1986-03-05 Hitachi Ltd Split print method in printer
JPH03112342U (en) * 1990-03-05 1991-11-18

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432001A (en) * 1981-01-16 1984-02-14 Fuji Xerox Co., Ltd. Heat-sensitive recording head driving method
JPS6145672A (en) * 1984-08-10 1986-03-05 Hitachi Ltd Split print method in printer
JPH03112342U (en) * 1990-03-05 1991-11-18

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