JPS5579182A - Thermal printer - Google Patents

Thermal printer

Info

Publication number
JPS5579182A
JPS5579182A JP15469578A JP15469578A JPS5579182A JP S5579182 A JPS5579182 A JP S5579182A JP 15469578 A JP15469578 A JP 15469578A JP 15469578 A JP15469578 A JP 15469578A JP S5579182 A JPS5579182 A JP S5579182A
Authority
JP
Japan
Prior art keywords
printing
signals
output signals
circuit
time
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.)
Granted
Application number
JP15469578A
Other languages
Japanese (ja)
Other versions
JPS6227994B2 (en
Inventor
Harutsugu Aimura
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP15469578A priority Critical patent/JPS5579182A/en
Publication of JPS5579182A publication Critical patent/JPS5579182A/en
Publication of JPS6227994B2 publication Critical patent/JPS6227994B2/ja
Granted 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

Landscapes

  • Fax Reproducing Arrangements (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To eliminate the unevenness of printing concentration in case of continuous or single printing only by mounting simple circuits, by installing an integrating means of printing signals and a comparison means for comparing the output signals of the integrating means and a fixed level to a head drive system. CONSTITUTION:A circuit SK for integrating the output signals of a printing pulse generating circuit CG, a circuit DB for differentiating said output signals and a comparison means CO are disposed to a head drive system. Here, when printing instruction pulses a continuously arrive as a1, a2, a3, the voltage of signals e slowly rises, and the high level time of the output signals g of a comparison circuit CO gradually becomes shorter. When the printing pulses reset as a portion between a3 and a4, the voltage of the signals e slowly drops, and the high level time of the output signals g of the comparison circuit again becomes longer. When printing continues, the ON time of a transistor Q2-- that is, the low level time of signals h-- gradually becomes shorter. Inversely, when the printing is reopened after the printing is suspended, the ON time of the Q2-- that is, the low level time of the signals h-- becomes longer. Thus, printing can be performed without the unevenness of printing.
JP15469578A 1978-12-13 1978-12-13 Thermal printer Granted JPS5579182A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15469578A JPS5579182A (en) 1978-12-13 1978-12-13 Thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15469578A JPS5579182A (en) 1978-12-13 1978-12-13 Thermal printer

Publications (2)

Publication Number Publication Date
JPS5579182A true JPS5579182A (en) 1980-06-14
JPS6227994B2 JPS6227994B2 (en) 1987-06-17

Family

ID=15589915

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15469578A Granted JPS5579182A (en) 1978-12-13 1978-12-13 Thermal printer

Country Status (1)

Country Link
JP (1) JPS5579182A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856874A (en) * 1981-09-30 1983-04-04 Sharp Corp Heat sensitive recording device
JPS58121463U (en) * 1982-02-10 1983-08-18 ソニー株式会社 thermal printer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5084248A (en) * 1973-11-26 1975-07-08
JPS5116935A (en) * 1974-07-31 1976-02-10 Matsushita Electric Ind Co Ltd
JPS52384A (en) * 1975-06-20 1977-01-05 Matsushita Electric Works Ltd Tester for leakage breaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5084248A (en) * 1973-11-26 1975-07-08
JPS5116935A (en) * 1974-07-31 1976-02-10 Matsushita Electric Ind Co Ltd
JPS52384A (en) * 1975-06-20 1977-01-05 Matsushita Electric Works Ltd Tester for leakage breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5856874A (en) * 1981-09-30 1983-04-04 Sharp Corp Heat sensitive recording device
JPS58121463U (en) * 1982-02-10 1983-08-18 ソニー株式会社 thermal printer
JPH0117886Y2 (en) * 1982-02-10 1989-05-24

Also Published As

Publication number Publication date
JPS6227994B2 (en) 1987-06-17

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