JPS5684982A - Controlling method for current loading time in heat recording system - Google Patents

Controlling method for current loading time in heat recording system

Info

Publication number
JPS5684982A
JPS5684982A JP16119379A JP16119379A JPS5684982A JP S5684982 A JPS5684982 A JP S5684982A JP 16119379 A JP16119379 A JP 16119379A JP 16119379 A JP16119379 A JP 16119379A JP S5684982 A JPS5684982 A JP S5684982A
Authority
JP
Japan
Prior art keywords
current loading
loading time
gates
becomes
voltage
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
JP16119379A
Other languages
Japanese (ja)
Inventor
Shingo Yamaguchi
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 JP16119379A priority Critical patent/JPS5684982A/en
Publication of JPS5684982A publication Critical patent/JPS5684982A/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
    • B41J2/36—Print density control

Abstract

PURPOSE:To make constant a power amount applied to a heat element and eliminate unevenness in density irrespective of changes in applied voltage, by a method wherein a current loading time is controlled by comparing an integral value of the applied voltages with a reference value. CONSTITUTION:A current loading time to heat generating resistors R1-R1728 at a dot section is determined by an ON time of AND gates A1-A216 connected to bases of switching transistors Tr1-Tr216. That is, after a flip-flop FF is set, AND gates A1-A216 are turned ON, and a specific heat generating resistance part is energized with No.2 transistors TrG1-TrG8 ON. Simultaneously, a transistor FET becomes OFF, and an integral voltage is produced in a capacitor C1. When the integral voltage reduces gradually and comes down to below a reference voltage, then the flip-flop becomes OFF through the output of a comparator COM, and the capacitor C1 is cleared simultaneoulsy when the AND gates A1-A216 becomes OFF.
JP16119379A 1979-12-12 1979-12-12 Controlling method for current loading time in heat recording system Pending JPS5684982A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16119379A JPS5684982A (en) 1979-12-12 1979-12-12 Controlling method for current loading time in heat recording system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16119379A JPS5684982A (en) 1979-12-12 1979-12-12 Controlling method for current loading time in heat recording system

Publications (1)

Publication Number Publication Date
JPS5684982A true JPS5684982A (en) 1981-07-10

Family

ID=15730345

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16119379A Pending JPS5684982A (en) 1979-12-12 1979-12-12 Controlling method for current loading time in heat recording system

Country Status (1)

Country Link
JP (1) JPS5684982A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57116668A (en) * 1981-01-14 1982-07-20 Hitachi Ltd Heat sensitive recording device
JPS612578A (en) * 1984-06-15 1986-01-08 Matsushita Graphic Commun Syst Inc Thermal recorder
JPS6140172A (en) * 1984-08-01 1986-02-26 Matsushita Graphic Commun Syst Inc Thermal recorder
JPS61139460A (en) * 1984-12-12 1986-06-26 Matsushita Graphic Commun Syst Inc Recorder
JPS61179762A (en) * 1985-02-05 1986-08-12 Matsushita Graphic Commun Syst Inc Recording apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57116668A (en) * 1981-01-14 1982-07-20 Hitachi Ltd Heat sensitive recording device
JPS612578A (en) * 1984-06-15 1986-01-08 Matsushita Graphic Commun Syst Inc Thermal recorder
JPH0377785B2 (en) * 1984-06-15 1991-12-11 Matsushita Graphic Communic
JPS6140172A (en) * 1984-08-01 1986-02-26 Matsushita Graphic Commun Syst Inc Thermal recorder
JPH047713B2 (en) * 1984-08-01 1992-02-12 Matsushita Graphic Communic
JPS61139460A (en) * 1984-12-12 1986-06-26 Matsushita Graphic Commun Syst Inc Recorder
JPS61179762A (en) * 1985-02-05 1986-08-12 Matsushita Graphic Commun Syst Inc Recording apparatus

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