JPS5796877A - Device for controlling heat sensitive recording - Google Patents

Device for controlling heat sensitive recording

Info

Publication number
JPS5796877A
JPS5796877A JP17342780A JP17342780A JPS5796877A JP S5796877 A JPS5796877 A JP S5796877A JP 17342780 A JP17342780 A JP 17342780A JP 17342780 A JP17342780 A JP 17342780A JP S5796877 A JPS5796877 A JP S5796877A
Authority
JP
Japan
Prior art keywords
thinning
circuit
picture signal
signal
recording
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
JP17342780A
Other languages
Japanese (ja)
Inventor
Shigeru Katsuragi
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 JP17342780A priority Critical patent/JPS5796877A/en
Publication of JPS5796877A publication Critical patent/JPS5796877A/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
    • 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
    • B41J2/365—Print density control by compensation for variation in temperature

Landscapes

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

Abstract

PURPOSE:To prevent the excessive increase in the temperature of a recording heat and to decrease the degradation of picture quality by monitoring the temperature of a thermal head and picture data and determining data by thinning the recording by the combination of both. CONSTITUTION:A picture signal C is given to a picture signal converter 4 as a recording signal l through a thinning control circuit 10. The thinning control device 10 is constituted by a black rate detector 11, a judging circuit 12, and a thinning circuit 13. The picture signal C is held for one period in the black rate detector 11, and applied to a counter CO1 at the time of black 1. The output of F3 indicates the magnitude of the black rate. An output Q is applied to the judging circuit as a thinning signal g. A temperature judging circuit 7 is constituted by two comparators CP1 and CP2, and their outputs d and e are applied to the judging circuit 12 which is constituted by an AND gate A2 and an OR gate R2. The thinning requirement is judged in the circuit 12, and a command signal i is given to the thinning circuit 13. When i=''0'', the input picture signal C itself is a recording picture signal l. When i=''1'', the picture signal C is thinned during the period an output pulse j of pulse generator PG is a ''1''.
JP17342780A 1980-12-09 1980-12-09 Device for controlling heat sensitive recording Pending JPS5796877A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17342780A JPS5796877A (en) 1980-12-09 1980-12-09 Device for controlling heat sensitive recording

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17342780A JPS5796877A (en) 1980-12-09 1980-12-09 Device for controlling heat sensitive recording

Publications (1)

Publication Number Publication Date
JPS5796877A true JPS5796877A (en) 1982-06-16

Family

ID=15960247

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17342780A Pending JPS5796877A (en) 1980-12-09 1980-12-09 Device for controlling heat sensitive recording

Country Status (1)

Country Link
JP (1) JPS5796877A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6238034B1 (en) 1992-06-26 2001-05-29 Canon Kabushiki Kaisha Ink-jet recording methods and apparatuses
JP2012051346A (en) * 2010-09-03 2012-03-15 Toshiba Tec Corp Image forming apparatus and image forming method for the image forming apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6238034B1 (en) 1992-06-26 2001-05-29 Canon Kabushiki Kaisha Ink-jet recording methods and apparatuses
JP2012051346A (en) * 2010-09-03 2012-03-15 Toshiba Tec Corp Image forming apparatus and image forming method for the image forming apparatus

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