JPS56142081A - Thermal head - Google Patents

Thermal head

Info

Publication number
JPS56142081A
JPS56142081A JP4643580A JP4643580A JPS56142081A JP S56142081 A JPS56142081 A JP S56142081A JP 4643580 A JP4643580 A JP 4643580A JP 4643580 A JP4643580 A JP 4643580A JP S56142081 A JPS56142081 A JP S56142081A
Authority
JP
Japan
Prior art keywords
substrate
heat radiation
radiation plate
metallic sheet
heat
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
JP4643580A
Other languages
Japanese (ja)
Inventor
Toyohiko Takahashi
Hideo Abe
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 JP4643580A priority Critical patent/JPS56142081A/en
Publication of JPS56142081A publication Critical patent/JPS56142081A/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)

Abstract

PURPOSE:To prevent generation of a clearance between a substrate and a heat radiation plate and enhance a resolution by providing a thermal compound layer between the substrate and the heat radiation plate located under the former and constituting the heat radiation plate with plural pieces of metallic sheet whose coefficient of thermal expansion becomes low as the heat irradiation plate becomes remote from the substrate. CONSTITUTION:A heat irradiation plate 5 such as of aluminum, etc. is provided under a substrate 1 through the intermediary of a thermal compound layer 6 and the heat radiation plate 5 is constituted with plural pieces of metallic sheet 7, 8 whose coefficient of thermal expansion varies. If the coefficient of thermal expansion of the metallic sheet 7 is higher than that of the metallic sheet 8, no clearance is generated between the substrate 1 and the heat radiation plate 5 because of the warping of the heat radiation plate 5 and the compound layer 6 in the same direction, even if the substrate 1 is warped due to the heat generation by an exothermic resistance 2. Thus it is possible to obtain a recorded image with less unevenness of recording density and high resolution.
JP4643580A 1980-04-09 1980-04-09 Thermal head Pending JPS56142081A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4643580A JPS56142081A (en) 1980-04-09 1980-04-09 Thermal head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4643580A JPS56142081A (en) 1980-04-09 1980-04-09 Thermal head

Publications (1)

Publication Number Publication Date
JPS56142081A true JPS56142081A (en) 1981-11-06

Family

ID=12747070

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4643580A Pending JPS56142081A (en) 1980-04-09 1980-04-09 Thermal head

Country Status (1)

Country Link
JP (1) JPS56142081A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989007049A1 (en) * 1988-01-28 1989-08-10 Eastman Kodak Company Improving image contrast by thermal printers
FR2662395A1 (en) * 1990-05-23 1991-11-29 Axiohm IMPROVEMENT TO THERMAL PRINTER HEADS.
JPH05193170A (en) * 1991-08-19 1993-08-03 Samsung Electronics Co Ltd Heat-sensitive recording element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989007049A1 (en) * 1988-01-28 1989-08-10 Eastman Kodak Company Improving image contrast by thermal printers
FR2662395A1 (en) * 1990-05-23 1991-11-29 Axiohm IMPROVEMENT TO THERMAL PRINTER HEADS.
JPH05193170A (en) * 1991-08-19 1993-08-03 Samsung Electronics Co Ltd Heat-sensitive recording element

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