JPS5782066A - Control circuit for preheat pulse width in heat-sensitive recording device - Google Patents

Control circuit for preheat pulse width in heat-sensitive recording device

Info

Publication number
JPS5782066A
JPS5782066A JP15645580A JP15645580A JPS5782066A JP S5782066 A JPS5782066 A JP S5782066A JP 15645580 A JP15645580 A JP 15645580A JP 15645580 A JP15645580 A JP 15645580A JP S5782066 A JPS5782066 A JP S5782066A
Authority
JP
Japan
Prior art keywords
signals
pulse width
temperature
preheat
period
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
JP15645580A
Other languages
Japanese (ja)
Inventor
Yukihiro Domae
Takahisa Ikeda
Noboru Suemori
Takashi Suzuki
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15645580A priority Critical patent/JPS5782066A/en
Publication of JPS5782066A publication Critical patent/JPS5782066A/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
    • B41J2/365—Print density control by compensation for variation in temperature
    • 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

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To suppress a temperature rise of a heat-sensitive head at a high temperature, and to obtain sufficient preheating effect at a low temperature by using the product of the output signals of a monostable multivibrator and signals synchronizing with the triger signals of the output signals as preheat pulses. CONSTITUTION:When the trigger signals B are supplied to the monostable multivibrator 4, signals C having predetermined pulse with are outputted from an output terminal OUT in response to temperature sensed by means of a thermistor 2. The product of the signals C and the signals A synchronizing with the trigger signals B is taken by an AND circuit 5, and the preheat pulses D are obtained. When the pulse width is selected to a prescribed value, the pulse width is changed up to zero from t1 for a period of a ''H'' level of the signals A. That is, a period of the ''H'' level of the signals C having wide pulse width shortens at first when the temperature rises, and the preheat pulses D reach zero when the pulse width becomes shorter than a t2 period. Since preheat pulse width can minutely be controlled together with the temperature, sufficient preheating effect is acquired at a low temperature, and a temperature rise can be suppressed by an arbitrarily value at a high temperature.
JP15645580A 1980-11-08 1980-11-08 Control circuit for preheat pulse width in heat-sensitive recording device Pending JPS5782066A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15645580A JPS5782066A (en) 1980-11-08 1980-11-08 Control circuit for preheat pulse width in heat-sensitive recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15645580A JPS5782066A (en) 1980-11-08 1980-11-08 Control circuit for preheat pulse width in heat-sensitive recording device

Publications (1)

Publication Number Publication Date
JPS5782066A true JPS5782066A (en) 1982-05-22

Family

ID=15628118

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15645580A Pending JPS5782066A (en) 1980-11-08 1980-11-08 Control circuit for preheat pulse width in heat-sensitive recording device

Country Status (1)

Country Link
JP (1) JPS5782066A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS649759A (en) * 1987-07-03 1989-01-13 Canon Kk Recorder
JPH01180364A (en) * 1988-01-11 1989-07-18 Fujitsu Ltd Printing concentration correction system of thermal printer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS649759A (en) * 1987-07-03 1989-01-13 Canon Kk Recorder
JPH01180364A (en) * 1988-01-11 1989-07-18 Fujitsu Ltd Printing concentration correction system of thermal printer

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