JPS57178778A - Thermal printer - Google Patents

Thermal printer

Info

Publication number
JPS57178778A
JPS57178778A JP6493481A JP6493481A JPS57178778A JP S57178778 A JPS57178778 A JP S57178778A JP 6493481 A JP6493481 A JP 6493481A JP 6493481 A JP6493481 A JP 6493481A JP S57178778 A JPS57178778 A JP S57178778A
Authority
JP
Japan
Prior art keywords
time
adapter
voltage
value
power
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
JP6493481A
Other languages
Japanese (ja)
Inventor
Shigeru Toyomura
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 JP6493481A priority Critical patent/JPS57178778A/en
Publication of JPS57178778A publication Critical patent/JPS57178778A/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 enable to obtain an adequate typing density of a thermal printer even if an AC adapter power source is used by detecting the voltages of the drive power sources of the printer plural times and setting the energizing time of the head with the mean value of the detected voltages. CONSTITUTION:In case that a transistor T becomes ON with a command from an ROM when an AC adapter is connected to a power jack PJ and an electric power is supplied from the adapter to a power line 12, a current flows through a quasi-load L, and specific voltage characteristic is exhibited as time is elapsed. Then, after it stands by for the prescribed period of time (at the point A), data code DA corresponding to the input voltage VA is obtained form a voltage detector in an arithmetic unit U, and is stored in an RAM. Further, after the prescribed period of time (at the point B), the voltage is detected, data code DB corresponding to the input voltage B at that time is obtained, and is stored in the RAM, the average of the data codes is obtained by an arithmetic processor, and this value is outputted to a printing controller PC. The controller PC determines the energizing pulse width based on the value, thereby controlling the printing.
JP6493481A 1981-04-27 1981-04-27 Thermal printer Pending JPS57178778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6493481A JPS57178778A (en) 1981-04-27 1981-04-27 Thermal printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6493481A JPS57178778A (en) 1981-04-27 1981-04-27 Thermal printer

Publications (1)

Publication Number Publication Date
JPS57178778A true JPS57178778A (en) 1982-11-04

Family

ID=13272350

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6493481A Pending JPS57178778A (en) 1981-04-27 1981-04-27 Thermal printer

Country Status (1)

Country Link
JP (1) JPS57178778A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60145864A (en) * 1984-01-09 1985-08-01 Matsushita Graphic Commun Syst Inc Recording element drive control system
JPS60155475A (en) * 1984-01-26 1985-08-15 Matsushita Graphic Commun Syst Inc Controlling system for driving recording element
JPS6241057A (en) * 1985-08-20 1987-02-23 Seikosha Co Ltd Thermal printer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60145864A (en) * 1984-01-09 1985-08-01 Matsushita Graphic Commun Syst Inc Recording element drive control system
JPH044950B2 (en) * 1984-01-09 1992-01-29
JPS60155475A (en) * 1984-01-26 1985-08-15 Matsushita Graphic Commun Syst Inc Controlling system for driving recording element
JPH044951B2 (en) * 1984-01-26 1992-01-29
JPS6241057A (en) * 1985-08-20 1987-02-23 Seikosha Co Ltd Thermal printer

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