JPS5782066A - Control circuit for preheat pulse width in heat-sensitive recording device - Google Patents
Control circuit for preheat pulse width in heat-sensitive recording deviceInfo
- 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
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.
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)
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 |
-
1980
- 1980-11-08 JP JP15645580A patent/JPS5782066A/en active Pending
Cited By (2)
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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