JPS6449663A - Head temperature control system - Google Patents
Head temperature control systemInfo
- Publication number
- JPS6449663A JPS6449663A JP20695987A JP20695987A JPS6449663A JP S6449663 A JPS6449663 A JP S6449663A JP 20695987 A JP20695987 A JP 20695987A JP 20695987 A JP20695987 A JP 20695987A JP S6449663 A JPS6449663 A JP S6449663A
- Authority
- JP
- Japan
- Prior art keywords
- time
- logical
- circuit
- clock signal
- head
- 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
Landscapes
- Electronic Switches (AREA)
Abstract
PURPOSE:To increase a printing speed by removing nonuniformity of a printing density owing to dispersion of a head temperature, by executing control of an electrothermal time with hardware composed of an integrating circuit, a voltage control oscillating circuit, and a timer circuit. CONSTITUTION:A head driver circuit 6 heats a head by application of current when a drive signal b is logical '1'. A drive signal 6 is fed back to a transistor 1, which supplies a current an integrating circuit 3 via a thermistor 2. A voltage control oscillating circuit 4 controls frequency of a clock signal (c), and as an input voltage increases, an oscillating voltage rises. The drive signal (b) outputted from a timer circuit 5 is triggered by trigger input a to become logical '1'. When logical variation of the clock signal (c) is counted several times, it becomes logical '0'. Since time from being triggered to end of counting is short in the case where frequency of the clock signal (c) is high, time while a drive signal a becomes logical '1' becomes short. In the case where frequency of the clock signal (c) is low, a drive time becomes long. Heating time of the head for a dot to be printed is controlled thus by a past electrothermal time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20695987A JPS6449663A (en) | 1987-08-19 | 1987-08-19 | Head temperature control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20695987A JPS6449663A (en) | 1987-08-19 | 1987-08-19 | Head temperature control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6449663A true JPS6449663A (en) | 1989-02-27 |
Family
ID=16531843
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20695987A Pending JPS6449663A (en) | 1987-08-19 | 1987-08-19 | Head temperature control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6449663A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0348623A1 (en) * | 1988-06-27 | 1990-01-03 | Mitsubishi Denki Kabushiki Kaisha | Videophone with detachable TV camera |
US5191601A (en) * | 1990-04-04 | 1993-03-02 | Kabushiki Kaisha Toshiba | Video phone unit |
-
1987
- 1987-08-19 JP JP20695987A patent/JPS6449663A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0348623A1 (en) * | 1988-06-27 | 1990-01-03 | Mitsubishi Denki Kabushiki Kaisha | Videophone with detachable TV camera |
US5191601A (en) * | 1990-04-04 | 1993-03-02 | Kabushiki Kaisha Toshiba | Video phone unit |
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