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JPS54161950A - Exothermic printing element - Google Patents

Exothermic printing element

Info

Publication number
JPS54161950A
JPS54161950A JP7059578A JP7059578A JPS54161950A JP S54161950 A JPS54161950 A JP S54161950A JP 7059578 A JP7059578 A JP 7059578A JP 7059578 A JP7059578 A JP 7059578A JP S54161950 A JPS54161950 A JP S54161950A
Authority
JP
Japan
Prior art keywords
substrate
electrodes
layer
make
closer
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
JP7059578A
Other languages
Japanese (ja)
Inventor
Kunio Yasumi
Toshibumi Asakawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP7059578A priority Critical patent/JPS54161950A/en
Publication of JPS54161950A publication Critical patent/JPS54161950A/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
    • B41J2/335—Structure of thermal heads

Landscapes

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

Abstract

PURPOSE:To make the rise of heat evolution to thermographic paper faster, make the holding time of recordable temperature longer and make the time necessary for recording shorter as a whole by so constituting the exothermic printing element that currents concentrate at the surface part of resistors. CONSTITUTION:After a RuO2 base resistance layer 8 is bonded through vapor deposition, coating, etc. on an alumina substrate 1 being an insulation type substrate, gold electrodes 21, 22 and further a glass film 7 being a protecting layer are provided on the substrate 1 and layer 8. The mutually opposing end parts of the electrodes 21, 22 are formed to such a shape wherein the opposing distance is longer at the portions closer to the substrate and becomes shorter as they go further from the substrate, i.e., as they go closer to the peak part in contact with the thermographic paper, like the dotted line. Hence, the resistance between the electrodes 21, 22 is higher at the portions closer to the substrate 1 side and lower at the portions closer to the thermographic paper side. As a result, when voltage is applied between the electrodes 21, 22, currents concentrates at the peak part of the layer 8 and the evolution of heat at that portion is high and temperature rise fast.
JP7059578A 1978-06-12 1978-06-12 Exothermic printing element Pending JPS54161950A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7059578A JPS54161950A (en) 1978-06-12 1978-06-12 Exothermic printing element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7059578A JPS54161950A (en) 1978-06-12 1978-06-12 Exothermic printing element

Publications (1)

Publication Number Publication Date
JPS54161950A true JPS54161950A (en) 1979-12-22

Family

ID=13436062

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7059578A Pending JPS54161950A (en) 1978-06-12 1978-06-12 Exothermic printing element

Country Status (1)

Country Link
JP (1) JPS54161950A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4840500A (en) * 1986-07-30 1989-06-20 Hitachi, Ltd. Thermal transfer printer having an improved thermal head to improve ink transfer eveness

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4840500A (en) * 1986-07-30 1989-06-20 Hitachi, Ltd. Thermal transfer printer having an improved thermal head to improve ink transfer eveness

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