EP0673774A2 - Compensation des chutes de tension dues à l'emplacement de l'élément chauffant résistif dans les têtes d'impression thermiques - Google Patents

Compensation des chutes de tension dues à l'emplacement de l'élément chauffant résistif dans les têtes d'impression thermiques Download PDF

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Publication number
EP0673774A2
EP0673774A2 EP95103031A EP95103031A EP0673774A2 EP 0673774 A2 EP0673774 A2 EP 0673774A2 EP 95103031 A EP95103031 A EP 95103031A EP 95103031 A EP95103031 A EP 95103031A EP 0673774 A2 EP0673774 A2 EP 0673774A2
Authority
EP
European Patent Office
Prior art keywords
heating elements
resistive heating
printhead
current
location
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.)
Withdrawn
Application number
EP95103031A
Other languages
German (de)
English (en)
Other versions
EP0673774A3 (fr
Inventor
David Louis C/O Eastman Kodak Company Jeanmaire
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0673774A2 publication Critical patent/EP0673774A2/fr
Publication of EP0673774A3 publication Critical patent/EP0673774A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the apparatus functions as follows: One image line of pulse-count data for 2,560 heating elements is transferred to an image line buffer 70.
  • the line buffer is divided into a plurality of sections. In the illustrative embodiment, eight sections have been assumed, although more or less can be used. Each of the eight sections correspond to a 320 heating element physical region of the thermal printhead.
  • a total address is assembled for all of the printhead segments in address calculator 88, with each printhead segment contributing one bit of the eight-bit address. This address is inputted to a look-up table 90, and represents one of 256 general electrical load states of the thermal printhead.
  • the look-up table contains pre-determined correction factors which were derived from electrical network models of the thermal printhead. The models predict voltages available within the printhead at each of the segments, depending upon the varying load conditions for each of the 256 states of the printhead where segments can be either ON or OFF.

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  • Electronic Switches (AREA)
EP95103031A 1994-03-25 1995-03-03 Compensation des chutes de tension dues à l'emplacement de l'élément chauffant résistif dans les têtes d'impression thermiques. Withdrawn EP0673774A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US21848694A 1994-03-25 1994-03-25
US218486 1994-03-25

Publications (2)

Publication Number Publication Date
EP0673774A2 true EP0673774A2 (fr) 1995-09-27
EP0673774A3 EP0673774A3 (fr) 1996-02-21

Family

ID=22815317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103031A Withdrawn EP0673774A3 (fr) 1994-03-25 1995-03-03 Compensation des chutes de tension dues à l'emplacement de l'élément chauffant résistif dans les têtes d'impression thermiques.

Country Status (2)

Country Link
EP (1) EP0673774A3 (fr)
JP (1) JPH07266599A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884189A1 (fr) * 1997-06-13 1998-12-16 Brother Kogyo Kabushiki Kaisha Méthode et appareil pour la commande d'une tête d'impression thermique
DE102007003138A1 (de) * 2007-01-16 2008-07-24 Francotyp-Postalia Gmbh Verfahren zum Ansteuern eines Thermotransferdruckkopfes

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6391266A (ja) * 1986-10-06 1988-04-21 Matsushita Electric Ind Co Ltd 感熱記録装置
JPS63159069A (ja) * 1986-12-23 1988-07-01 Matsushita Electric Ind Co Ltd 感熱プリンタ
JPS63159068A (ja) * 1986-12-23 1988-07-01 Matsushita Electric Ind Co Ltd 感熱記録装置
WO1991014577A1 (fr) * 1990-03-29 1991-10-03 Dowty Maritime Limited Dispositif d'enregistrement thermique
US5248995A (en) * 1991-02-25 1993-09-28 Alps Electric Co., Ltd. Heat control method of a thermal head

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6391266A (ja) * 1986-10-06 1988-04-21 Matsushita Electric Ind Co Ltd 感熱記録装置
JPS63159069A (ja) * 1986-12-23 1988-07-01 Matsushita Electric Ind Co Ltd 感熱プリンタ
JPS63159068A (ja) * 1986-12-23 1988-07-01 Matsushita Electric Ind Co Ltd 感熱記録装置
WO1991014577A1 (fr) * 1990-03-29 1991-10-03 Dowty Maritime Limited Dispositif d'enregistrement thermique
US5248995A (en) * 1991-02-25 1993-09-28 Alps Electric Co., Ltd. Heat control method of a thermal head

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12 no. 325 (M-737) [3172] ,5 September 1988 & JP-A-63 091266 (M. OYAMA) 21 April 1988, *
PATENT ABSTRACTS OF JAPAN vol. 12 no. 424 (M-761) [3271] ,10 November 1988 & JP-A-63 159068 (Y. MOJI) 1 July 1988, *
PATENT ABSTRACTS OF JAPAN vol. 12 no. 424 (M-761) [3271] ,10 November 1988 & JP-A-63 159069 (M. OYAMA) 1 July 1988, *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0884189A1 (fr) * 1997-06-13 1998-12-16 Brother Kogyo Kabushiki Kaisha Méthode et appareil pour la commande d'une tête d'impression thermique
US6043832A (en) * 1997-06-13 2000-03-28 Brother Kogyo Kabushiki Kaisha Method of and system for driving thermal head including a plurality of heating elements
DE102007003138A1 (de) * 2007-01-16 2008-07-24 Francotyp-Postalia Gmbh Verfahren zum Ansteuern eines Thermotransferdruckkopfes

Also Published As

Publication number Publication date
EP0673774A3 (fr) 1996-02-21
JPH07266599A (ja) 1995-10-17

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