JPS54139559A - Heat biasing system in thermographic head - Google Patents
Heat biasing system in thermographic headInfo
- Publication number
- JPS54139559A JPS54139559A JP4646178A JP4646178A JPS54139559A JP S54139559 A JPS54139559 A JP S54139559A JP 4646178 A JP4646178 A JP 4646178A JP 4646178 A JP4646178 A JP 4646178A JP S54139559 A JPS54139559 A JP S54139559A
- Authority
- JP
- Japan
- Prior art keywords
- resistance element
- heating resistance
- heating
- bias
- driving
- 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
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
- Electronic Switches (AREA)
Abstract
PURPOSE:To prevent the decrease in the density of recording images at heating resistance element block boundaries by simultaneously heating-driving the other heating resistance elements positioned closest to the heating resistance element blocks being heating-driven to the extent that thermographing is not accomplished. CONSTITUTION:Bias resistances 18, 20 and bias diodes 19, 21 are inserted between the driving leads 507, 508 of the heating resistance element block 15 connected to common wires 111, 112 and the driving leads 509, 510 at the end of the heating resistance element block 16 connected to common wires 113, 114. Bias resistances 22, 24 and bias diodes 23, 25 are inserted between the driving leads 515, 516 and driving leads 517, 518, between the heating resistance element blocks 16, 17. This makes it possible to flow bias current simultaneously to the heating elements adjoining to the respective heating resistance element blocks to be thermographed now and let heat be evolved up to the temperature at which recording does not take place.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4646178A JPS54139559A (en) | 1978-04-21 | 1978-04-21 | Heat biasing system in thermographic head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4646178A JPS54139559A (en) | 1978-04-21 | 1978-04-21 | Heat biasing system in thermographic head |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54139559A true JPS54139559A (en) | 1979-10-30 |
Family
ID=12747795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4646178A Pending JPS54139559A (en) | 1978-04-21 | 1978-04-21 | Heat biasing system in thermographic head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54139559A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4432001A (en) * | 1981-01-16 | 1984-02-14 | Fuji Xerox Co., Ltd. | Heat-sensitive recording head driving method |
JPS6145672A (en) * | 1984-08-10 | 1986-03-05 | Hitachi Ltd | Split print method in printer |
JPH03112342U (en) * | 1990-03-05 | 1991-11-18 |
-
1978
- 1978-04-21 JP JP4646178A patent/JPS54139559A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4432001A (en) * | 1981-01-16 | 1984-02-14 | Fuji Xerox Co., Ltd. | Heat-sensitive recording head driving method |
JPS6145672A (en) * | 1984-08-10 | 1986-03-05 | Hitachi Ltd | Split print method in printer |
JPH03112342U (en) * | 1990-03-05 | 1991-11-18 |
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