ATE108728T1 - CONTRAST CONTROL DEVICE AND METHOD FOR A THERMAL PRINT HEAD. - Google Patents

CONTRAST CONTROL DEVICE AND METHOD FOR A THERMAL PRINT HEAD.

Info

Publication number
ATE108728T1
ATE108728T1 AT90403412T AT90403412T ATE108728T1 AT E108728 T1 ATE108728 T1 AT E108728T1 AT 90403412 T AT90403412 T AT 90403412T AT 90403412 T AT90403412 T AT 90403412T AT E108728 T1 ATE108728 T1 AT E108728T1
Authority
AT
Austria
Prior art keywords
print head
thermal print
contrast control
printer
elements
Prior art date
Application number
AT90403412T
Other languages
German (de)
Inventor
Christian Lavergne
Original Assignee
Sagem
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 Sagem filed Critical Sagem
Application granted granted Critical
Publication of ATE108728T1 publication Critical patent/ATE108728T1/en

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)
  • Fax Reproducing Arrangements (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Abstract

The subject of the invention is a method of contrast control for a print medium produced by a thermal print head (1) of a printer of a data transmission system comprising a series of resistive elements arranged to be activated by the passage of a current provided by a card (3) linked to a source of power (4) and in order thus to heat. The activation times of the elements are adjusted at the start of printing for a print cycle of minimal duration. For longer cycles, the elements are reactivated (14) as soon as their temperature while falling reaches the initial temperature, by a series of holding microcycles with very short durations of activation. If the printer of a fax machine is concerned, to which the invention applies particularly well, contrast can thus be adjusted as a function of the nature of the quality of the thermosensitive paper and of the rendering which it is desired to obtain with respect to an original document. <IMAGE>
AT90403412T 1989-12-07 1990-11-30 CONTRAST CONTROL DEVICE AND METHOD FOR A THERMAL PRINT HEAD. ATE108728T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8916181A FR2655592B1 (en) 1989-12-07 1989-12-07 METHOD FOR CONTROLLING THE CONTRAST OF A PRINTING MEDIUM PRODUCED BY A THERMAL WRITING HEAD AND PRINTING SYSTEM IMPLEMENTING THE METHOD.

Publications (1)

Publication Number Publication Date
ATE108728T1 true ATE108728T1 (en) 1994-08-15

Family

ID=9388251

Family Applications (1)

Application Number Title Priority Date Filing Date
AT90403412T ATE108728T1 (en) 1989-12-07 1990-11-30 CONTRAST CONTROL DEVICE AND METHOD FOR A THERMAL PRINT HEAD.

Country Status (6)

Country Link
EP (1) EP0432024B1 (en)
AT (1) ATE108728T1 (en)
DE (1) DE69010859T2 (en)
DK (1) DK0432024T3 (en)
ES (1) ES2060113T3 (en)
FR (1) FR2655592B1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975707A (en) * 1970-04-13 1976-08-17 Canon Kabushiki Kaisha Device for controlling the density of printing characters
JPS6327271A (en) * 1986-07-18 1988-02-04 Shinko Electric Co Ltd Thermal transfer printer
JPS6318259U (en) * 1986-07-22 1988-02-06
JPH0632943B2 (en) * 1986-10-20 1994-05-02 株式会社日立製作所 Thermal transfer printer

Also Published As

Publication number Publication date
FR2655592A1 (en) 1991-06-14
EP0432024A1 (en) 1991-06-12
FR2655592B1 (en) 1995-04-07
DE69010859T2 (en) 1995-03-09
ES2060113T3 (en) 1994-11-16
EP0432024B1 (en) 1994-07-20
DK0432024T3 (en) 1994-11-21
DE69010859D1 (en) 1994-08-25

Similar Documents

Publication Publication Date Title
KR850006732A (en) Heating method of the thermal head of the thermal printer
JPH06210889A (en) Thermal transfer printing method
DE69010859D1 (en) Contrast control device and method for a thermal print head.
JPH0253232B2 (en)
US7319473B2 (en) Thermal recording system and method
KR960003975A (en) Printing equipment
JPH0768826A (en) Preheating method of thermal head
JP3110853B2 (en) Recording method and apparatus
JPH0480052A (en) Thermal transfer serial printer
JP2709057B2 (en) Thermal print control circuit
JPS61206673A (en) Thermal printer
JPH09314886A (en) Thermal printer having heat accumulation control function
JPH1148510A (en) Printer and its method for recording
JPS6327273A (en) Thermal transfer printer
JP2510144Y2 (en) Thermal recording device
ES2129111T3 (en) APPARATUS FOR THERMAL PRINTING, WITH LINE HEAD.
JPS6464866A (en) Thermal head driving apparatus
JPS5912875A (en) Thermal printer
JPH06122225A (en) Thermal-head controller
KR950028924A (en) Automatic cleaning method and circuit of thermal transfer printer
JP2008036819A (en) Thermal printer
JPH0482755A (en) Thermal recorder
JPS60116475A (en) Printed density controlling method for thermal printer
JPS63270163A (en) Heating value controller for thermal head
KR910000368A (en) Heat generating time adjusting device of thermal printer head

Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee