CN1070114C - Printing apparatus - Google Patents
Printing apparatus Download PDFInfo
- Publication number
- CN1070114C CN1070114C CN95108901A CN95108901A CN1070114C CN 1070114 C CN1070114 C CN 1070114C CN 95108901 A CN95108901 A CN 95108901A CN 95108901 A CN95108901 A CN 95108901A CN 1070114 C CN1070114 C CN 1070114C
- Authority
- CN
- China
- Prior art keywords
- thermal head
- lettering
- temperature
- pulse value
- value
- 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.)
- Expired - Fee Related
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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
- B41J2/3556—Preheating pulses
-
- 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
- B41J2/38—Preheating, i.e. heating to a temperature insufficient to cause printing
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- Electronic Switches (AREA)
Abstract
The invention discloses a printing apparatus for receive high quality printing image, characteristic in that having control apparatus, control means allowing a thermal head to perform printing on the basis of image data in predetermined printing pulse width and subsequently performing the preheating control of the thermal head in predetermined preheating pulse width during the period up to the start of next printing are provided. The control means have table data wherein the width of the printing pulse to be applied to the thermal head is set corresponding to the temp. of the thermal head and table data to which preheating pulse width is set. The ratio of the value of the preheating pulse width set to the table data to the value of the printing pulse width set to the table data in the same way is set high when the temperature of the thermal head is low and set low when the temperature of the head is high. Preheating control performing by above control apparatus repeatly carries out, until to the start of next printing.
Description
The present invention relates to the printing device of relevant picture unit etc., relates to carry out with thermal head the printing device of lettering in more detail.
Usually, in picture unit, pictorial data is transmitted with the form of coding, but the information content of each row of its coded data is different.Thus, when transmitting pictorial data,, be used for that each row is encoded and time of deciphering processing also changes along with the variation of each row delivery time.So, when receiving such pictorial data and on record-paper, carrying out lettering, play from the lettering that carries out delegation and to begin the time between the lettering next time, follow that each row transmits, the variation in processing time and changing.
Yet, in using the printing device of thermal head, in case elongated from the lettering that carries out delegation to the time the beginning next line lettering, because, the thermal head control of can not generating heat during this, the temperature decline of this thermal head.Therefore, when carrying out the next line lettering, both made the heating control of carrying out thermal head, and the temperature of this thermal head had fully been risen, so lettering concentration can be thin out.
Use the printing device of this thermal head, when when elongated,, being that this thermal head is carried out preheating in the past for the temperature that does not make thermal head reduces from the time of beginning delegation lettering to beginning next line lettering.As the open communique spy of Japan Patent open shown in the clear 64-9759 like that.
That is to say that in this device in the past, as being represented by solid line among Fig. 5, the temperature of setting corresponding thermal head should be added in the chart data of the lettering pulse value on this thermal head.And, the Temperature Detector that is used to detect this thermal head temperature is housed on thermal head.And when being carried out each row lettering by thermal head, according to the detected temperature of Temperature Detector, and with reference to chart data, setting should be added on the only lettering pulse value on the thermal head, and the lettering pulse that is set time value is added on this thermal head.And, carrying out after the lettering of this row, the pulse signal that is used for preheating is added to thermal head.A few percent of the time value of the lettering pulse that but the time value of this preheat pulse is the front to be added (for example 50%) is set like this.Exactly as shown in dotted lines in Figure 5, in the past, after the lettering pulse value by the chart data regulation carries out lettering,, usually there was the preheat pulse of a certain proportion of time value to be added on the thermal head to its lettering pulse value.
Yet, as described above, when at the lettering pulse value, when setting the preheat pulse value with certain proportion often, will produce following such problem.Just, when the time of each transmission of going, processing was no more than predefined stipulated time value (for example 10ms), record-paper was seen off delegation in its each official hour value.Thus, shown in solid line among Fig. 5, the temperature of thermal head is low, both made to be necessary to increase the lettering pulse value, and in fact the maximum of its lettering pulse is subjected to the restriction of above-mentioned time value, and can't sets bigger than it.Therefore, as shown in phantom in Figure 5, when the temperature of thermal head was hanged down, the preheat pulse value that is determined by the lettering pulse value was limited on its maximum, so existence is the problem of preheating thermal head fully.
And in contrast, the temperature of thermal head is higher, has both made to be necessary to reduce the lettering pulse value, and the preheat pulse value is set bigger than required, also exists thermal head to surpass the such problem of suitable preheat temperature.As a result, lettering concentration depth inequality takes place, and can't obtain the such problem of high-quality lettering image.
The present invention is exactly in order to address the above problem, and its objective is that providing a kind of can not make lettering concentration produce depth inequality, and can access the printing device of high-quality lettering image always with suitable preheat pulse value preheating thermal head.
For reaching above purpose, the present invention takes following technical scheme:
The invention provides a kind of printing device, it is characterized in that being provided with control device, described control device has carried out lettering after by thermal head with certain lettering pulse value according to pictorial data, up to next lettering begin during in, with the pre-thermal control thermal head of certain preheat pulse value; The temperature of corresponding thermal head, described control device have respectively the chart data of storing, setting the lettering pulse value that is added on the same thermal head, the memory that reaches the chart data of setting the preheat pulse value.
Described printing device is characterized in that: the ratio of the preheat pulse value of in chart data, setting and the lettering pulse value of in chart data, setting equally, and then big more when the temperature of thermal head is low more, then more little when the temperature of this thermal head is high more.
Above-mentioned control device carries out pre-thermal control repeatedly with certain cycle, till next lettering begins.
Therefore, according to printing device of the present invention, the temperature of corresponding thermal head, be added in the chart data of the lettering pulse value on the same thermal head and the chart data of preheat pulse value owing to possess respectively to set, preheat pulse value and lettering pulse value are irrelevant, can be set on the suitable value.
According to printing device of the present invention, when both having made the temperature of thermal head low, also can carry out abundant preheating to this thermal head.And when both having made the temperature of thermal head higher, the preheat pulse value can not be set above more than the desired value, and this thermal head does not have and surpasses correct preheat temperature.
According to printing device of the present invention, both made beginning when elongated during this period of time to lettering next time from carrying out lettering, the preheat temperature of thermal head begins to remain on the suitable temperature up to next lettering always.
The present invention has following effect:
According to the present invention, preheat pulse value and lettering pulse value are irrelevant, can be set in respectively on the suitable value.Therefore, thermal head can come preheating by suitable preheat pulse value usually, can not produce lettering concentration depth inequality, so can obtain high-quality lettering image.
According to the present invention, when both having made the temperature of thermal head on the low side, also this thermal head of preheating fully.And when both having made the temperature drift of thermal head, the preheat pulse value can not be set greater than desirable value yet, and this thermal head can not surpass suitable preheat temperature.
According to the present invention, both made become very long from the beginning lettering to the time lettering begins next time situation under, also can be positively with the thermal head preheat temperature till next lettering begins, remain on the suitable temperature always.
Followingly embodiments of the invention are elaborated with reference to accompanying drawing:
Fig. 1 is the block diagram that expression the present invention is embodied as the embodiment in the picture unit.
The flow chart of Fig. 2 insertion program that to be expression carry out according to the input of inserting signal for expression when the flow chart, particularly (b) that receive the action of one page pictorial data by CPU.
Fig. 3 is the temperature of the corresponding thermal head of expression and set the key diagram of the chart data of the lettering pulse value that adds to this thermal head.
Fig. 4 is the temperature of the corresponding thermal head of expression and set the chart data key diagram of the preheat pulse value that should add to this thermal head.
Fig. 5 is the key diagram of the preheat pulse value of the preheat pulse value of the lettering pulse value of representing more corresponding respectively thermal head temperature, present embodiment and prior art.
The time chart of action when Fig. 6 is the expression reception.
Below, the present invention specifically is used for an embodiment of picture unit according to description of drawings.
Fig. 1 represents that the loop of the picture unit of this embodiment constitutes.(in the central processing unit 1, connecting storage and be used for the ROM (read-only memory) 2 of program etc. of control device molar behavior and the RAM (random access memory (RAM)) 3 of the various information of temporary transient storage at CPU.In the present embodiment, by CPU1, ROM2 and RAM3 constitute control device.And, 2 chart data Td1 that represent respectively in Fig. 3 and Fig. 4, Td2 is stored in the ROM2 in advance.Relevant these chart datas Td1, the content of Td2 will be described in detail in the back.NCU (network control unit) 4 controls are connected with telephone line.Modem 5 is finished the modulation and demodulation that sends and receive data.
Reading part 6 reads the image on the original copy.Coding, decoding loop 7 are deciphered the pictorial data of reception when will be above-mentioned reading pictorial data and encoding.Thermal head drives loop 8 and makes the lettering pulse according to a row image data (line data) of being sent here by CPU1 and the lettering pulse value signal of following regulation.Thermal head drives loop 8 and is provided with not shown row memory; The line data that is transfused to temporarily is stored in this row memory.And, when in a single day this thermal head driving loop 8 receives the request lettering signal of CPU1 output, add the lettering pulse just for thermal head 9.Therefore,, be located in the thermal head 9, and unshowned in the drawings a plurality of heating resistors generate heat selectively, on record-paper, carry out delegation's lettering according to its lettering pulse.In addition, in the present embodiment, also can use printing device with the sensible heat transcription formula of the black heat transfer write on the colour band on record-paper as the printing device that has thermal head 9.And described thermal head drives loop 8 during thermal head 9 is by heating control, CPU1 is sent lettering represent signal.
In CPU1 output request lettering signal, to insert timer 13 and started, this starting rose after the regular hour (being 10ms in the present embodiment), produced to insert signal.And, inserting the input of signal according to this, CPU1 outputs to thermal head driving loop 8 with the preheat pulse signal of following setting, and simultaneously, the lettering signal is asked in output once more.So, according to the line data and the preheat pulse signal value that are stored in the row memory, thermal head drives loop 8 and produces preheat pulse, and this preheat pulse adds to thermal head 9.Thus, according to this preheat pulse, the heating resistor of thermal head 9 is generated heat selectively.In addition, heating thus, the place of the above-mentioned lettering on record-paper rewrites lettering.Also have, be preheated control period at such thermal head 9, thermal head drives loop 8 and also CPU1 is sent expression lettering signal.
Drive instruction according to the motor sent here by CPU1, motor driving loop 11 produces and drive signals, should drive signal outputs to paper pushing motor 12.Then, by driving signal by paper pushing motor 12 rotations, and delegation meets delegation and send record-paper.In addition, the delivery time of the every row of pictorial data is different with decoding processing required time.Like this, when transmission, the processing time of each row are no more than the stipulated time of establishing in advance (is 10ms at present embodiment), CPU1 drives instruction in its every 10ms output, send record-paper in every 10ms.
As shown in Figure 3, in above-mentioned chart data Td1, the temperature of corresponding thermal head 9 is set the time value (lettering pulse value) that is added in lettering pulse on this thermal head 9.Shown in figure, set this lettering pulse value, then big more when the temperature of thermal head 9 is low more, then more little when the temperature of this thermal head 9 is big more.But when the temperature of thermal head 9 was in the following scope of set point of temperature, the time value when not making paper feeding was greater than 10ms, and the lettering pulse value is limited on the certain value a little less than 10ms.
As shown in Figure 4, in above-mentioned chart data Td2, the temperature of corresponding thermal head 9 is set the time value (preheat pulse value) that is added in preheat pulse on the thermal head 9.Shown in figure, set this preheat pulse value, then big more when the temperature of thermal head 9 is low more, then more little when high more.And particularly Fig. 5 more clearly demonstrates, and the ratio of the lettering pulse value of setting among the chart data Td1 of this preheat pulse value to above-mentioned Fig. 3 is set at: then big more when the temperature of thermal head 9 is low more, and when then more little when high more with the temperature of thermal head 9.
Below, according to Fig. 2 (a), (b) flow chart shown in specifies relevant action when receiving one page pictorial data by above-mentioned CPU1.
Shown in Fig. 2 (a), when CPU1 one received pictorial data, at first, at step S1, by the decoding of coding, decoding loop 7 begin column data, simultaneously, this decoding data began to be transferred to thermal head and drives in the row memory in loop 8.And at step S2, CPU1 waits for the end of the decoding of line data, in case decoding finishes, forwards step S3 to, judges whether thermal head 9 is generating heat in the control, and this judgement is to represent what signal carried out according to there being the thermal head of having no way of to drive the lettering of exporting in loop 8.
Then, when existing lettering to represent the input of signal, CPU1 waits for that thermal head 9 is terminated heating control.And when not existing lettering to represent the input of signal, forward step S4 to, if inserting timer 13 has started, CPU1 stops this starting.Next, at step S5, CPU1 drives paper pushing motor 12 by motor driving loop 11, walks to send the record-paper of delegation.Down, at step S6, CPU1 obtains the temperature of thermal head 9 according to the detection signal of Temperature Detector 10 outputs.And at step S7, CPU1 refers again to chart data Td1 shown in Figure 3, sets the lettering pulse value that adds to thermal head 9 at first according to the temperature of the thermal head 9 that obtains, and this lettering pulse signal is delivered to thermal head driving loop 8.
Then, at step S8, CPU1 delivers to thermal head with the lettering request signal and drives loop 8.Thus, the thermal head 9 lettering pulse value control heating by setting earlier 9 is carried out lettering by this on record-paper.And in this lettering request signal output, make 13 startings of insertion timer at step S9, CPU1.So, after this starting 10ms, insert timer 13 generation insertion signals and output to CPU1.
And according to the insertion signal of this input, CPU1 carries out the insertion program shown in Fig. 2 (b).In addition, the time diagram with reference to shown in Figure 6 illustrates this insertion program.Shown in Fig. 2 (b), at step S11,, refer again to chart data Td2 shown in Figure 4 according to the temperature of the thermal head of learning earlier 9, CPU1 sets the preheat pulse value that adds to thermal head 9, and its preheat pulse value signal is sent into thermal head driving loop 8.Then, at step S12, CPU1 sends the lettering request signal into head and drives loop 8.Thus, by the preheat pulse value of setting earlier, thermal head 9 is preheated control, and the overlapping lettering of writing is carried out in the lettering place on above-mentioned record-paper.And in this lettering request signal of output, at step S13, CPU1 starts insertion timer 13 once more.Like this,, then carry out above-mentioned insertion program once more, as shown in Figure 6, the pre-thermal control of thermal head 9 was carried out repeatedly with the cycle of 10ms owing to behind its starting 10ms, insert timer 13 and produce the insertion signal once more.
Turn back to Fig. 2 (a), at step S10, CPU1 judges whether the data reception of one page ends, and when receiving at the end, just handles and once finishes, and as if receiving under the situation that does not have to end, turns back to above-mentioned steps S1, the decoding of beginning next line data.
In the carrying out of above-mentioned insertion program,,, judge that at step S3 thermal head 9 is whether in thermal control in advance in case the next line data decoding is ended at step S2.Thus, when its not in pre-thermal control the time, forward step S4 to, if stop to insert timer 13 immediately in pre-thermal control, after this pre-thermal control finishes, forward step S4 to, stop to insert timer 13.Its result makes the insertion EP (end of program), forwards the lettering action of next line data to.
As mentioned above,, both made, and also can not make the temperature reduction of thermal head 9 when when elongated,, beginning to the next line lettering by pre-thermal control thermal head 9 from the lettering that the carries out delegation time to beginning next line lettering at present embodiment.Therefore, when the next line lettering, when thermal head 9 is controlled by heating, the temperature of this thermal head 9 is risen on enough temperature, can not make lettering concentration thin out.
And at present embodiment, the temperature of corresponding thermal head 9 has respectively to set to be added in the chart data Td1 of the lettering pulse value on this thermal head 9 and the chart data Td2 of preheat pulse value.Therefore, with different in the past, can the preheat pulse value that adds to thermal head 9 be set in the lettering pulse value suitable value that it doesn't matter on.And as shown in Figure 5, the preheat pulse value (shown in dotted line among the figure) of present embodiment is to the ratio of lettering pulse value, and is low more and big more with the temperature of thermal head 9, then more little when the temperature of this thermal head 9 is high more.Just, have nothing to do owing to can set preheat pulse value and lettering pulse value, at present embodiment, with the preheat pulse value with comparing with in the past preheat pulse value shown in the dotted line among the figure, then big more when the temperature of thermal head 9 is low more, the temperature of this thermal head 9 is then more little when high more.
Consequently, at present embodiment, when both having made the temperature of thermal head 9 low, also the preheat pulse value can be set on the enough big value, and not be subjected to the restriction of lettering pulse value, thermal head 9 can carry out preheating fully.And, both made under the temperature condition with higher of thermal head 9, can the preheat pulse value not set for greater than required value yet, this thermal head 9 can not surpass appropriate preheat temperature.Therefore, in the lettering operation of reality,, then can access high-quality lettering image because of not producing the lettering density unevenness.
In addition, by the shape record of chart data Td2, the preheat pulse data of the temperature of corresponding thermal head 9 need not carried out complicated calculation processing etc., just can be simply and setting promptly add to preheat pulse value on the thermal head 9.
And, at present embodiment, the pre-thermal control of thermal head 9 till beginning, next lettering is carried out with the cycle of regulation always repeatedly.Therefore, both having made from carrying out the time of lettering beginning to next lettering is under the very long situation, the preheat temperature of thermal head 9 positively can be remained on the suitable temperature till the lettering of next time begins.
In addition, the present invention is not limited to the above embodiments, also can specifically implement by the form that resembles following.
(1) number of occurrence with pre-thermal control is limited in returning in the number of regulation.In this case, can prevent to follow the overlapping lettering of pre-thermal control and make lettering concentration overweight.
(2) set the preheat pulse value at every turn, detect the temperature of thermal head 9 by Temperature Detector 10.So, can more correctly detect the temperature of pre-thermal control thermal head 9 before, and can more suitably set the preheat pulse value.
(3) the present invention specifically is used for picture unit printing device in addition, as is used for printer.
Relevant technological thought beyond the apprehensible invention of the foregoing description is together done following record with its effect.
(1) in the present invention, the Temperature Detector that detects the thermal head temperature is set, according to the temperature that is detected by Temperature Detector, with reference to each chart data, setting should add to the lettering pulse and the preheat pulse value of thermal head.
Like this, detect the temperature of thermal head, can simply promptly set suitable lettering pulse value and preheat pulse value according to Temperature Detector.
Claims (3)
1, a kind of printing device, it is characterized in that being provided with control device, described control device has carried out lettering after by thermal head with certain lettering pulse value according to pictorial data, to next lettering begin during in, with the pre-thermal control thermal head of certain preheat pulse value; The temperature of corresponding thermal head, this control device have respectively the chart data of storing, setting the lettering pulse value that is added on this thermal head, the memory that reaches the chart data of setting the preheat pulse value.
2, printing device as claimed in claim 1, it is characterized in that: the preheat pulse value of setting in chart data is to the ratio of the same lettering pulse value of setting in chart data, then big more when the temperature of thermal head is low more, then more little when the temperature of this thermal head is high more.
3, printing device as claimed in claim 1 or 2, described control device carries out pre-thermal control repeatedly with certain cycle, till lettering begins next time.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP164155/1994 | 1994-07-15 | ||
| JP6164155A JP2715917B2 (en) | 1994-07-15 | 1994-07-15 | Printing device |
| JP164155/94 | 1994-07-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1118746A CN1118746A (en) | 1996-03-20 |
| CN1070114C true CN1070114C (en) | 2001-08-29 |
Family
ID=15787791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95108901A Expired - Fee Related CN1070114C (en) | 1994-07-15 | 1995-07-14 | Printing apparatus |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2715917B2 (en) |
| KR (1) | KR100227476B1 (en) |
| CN (1) | CN1070114C (en) |
| TW (1) | TW253950B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006108172A2 (en) * | 2005-04-06 | 2006-10-12 | Zink Imaging, L.L.C. | Multicolor thermal imaging method and thermal imaging member for use therein |
| JP5017833B2 (en) * | 2005-09-27 | 2012-09-05 | シンフォニアテクノロジー株式会社 | Printer and thermal head preheat control method |
| JP5782696B2 (en) * | 2010-09-29 | 2015-09-24 | シンフォニアテクノロジー株式会社 | Printer |
| JP6088600B2 (en) | 2015-07-31 | 2017-03-01 | 株式会社東芝 | Thermal printer, control method and computer program |
| JP7065644B2 (en) * | 2018-03-02 | 2022-05-12 | 東芝テック株式会社 | Thermal printer, thermal printer control method |
| JP7310082B2 (en) * | 2019-08-26 | 2023-07-19 | ローム株式会社 | Driver IC for thermal print head and thermal print head |
| JP7449147B2 (en) * | 2020-04-16 | 2024-03-13 | セイコーエプソン株式会社 | semiconductor equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0154514A2 (en) * | 1984-03-03 | 1985-09-11 | Fujitsu Limited | Method of heating thermal head of thermal printer |
| DE3833746A1 (en) * | 1988-09-30 | 1990-04-05 | Siemens Ag | Thermal printing with pre-heating resistor elements - energised by actual data and by clock pulse of variable width and height |
| JPH02270573A (en) * | 1989-04-13 | 1990-11-05 | Murata Mach Ltd | Thermosensitive recording device in facsimile and the like |
| US5191357A (en) * | 1988-07-01 | 1993-03-02 | Canon Kabushiki Kaisha | Method and apparatus for preheating a thermally activated printing head |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02145357A (en) * | 1988-11-28 | 1990-06-04 | Canon Inc | Conduction control system for thermal head |
| JPH04212869A (en) * | 1990-11-30 | 1992-08-04 | Sanyo Electric Co Ltd | Drive method for thermal head |
| JPH04329153A (en) * | 1991-04-30 | 1992-11-17 | Victor Co Of Japan Ltd | Controlling method for current supply of thermal head |
| JP3110859B2 (en) * | 1992-04-28 | 2000-11-20 | キヤノン株式会社 | Image recording method and apparatus and communication apparatus having the same |
-
1994
- 1994-07-15 JP JP6164155A patent/JP2715917B2/en not_active Expired - Lifetime
-
1995
- 1995-01-27 TW TW084100793A patent/TW253950B/en not_active IP Right Cessation
- 1995-03-28 KR KR1019950006788A patent/KR100227476B1/en not_active IP Right Cessation
- 1995-07-14 CN CN95108901A patent/CN1070114C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0154514A2 (en) * | 1984-03-03 | 1985-09-11 | Fujitsu Limited | Method of heating thermal head of thermal printer |
| US5191357A (en) * | 1988-07-01 | 1993-03-02 | Canon Kabushiki Kaisha | Method and apparatus for preheating a thermally activated printing head |
| DE3833746A1 (en) * | 1988-09-30 | 1990-04-05 | Siemens Ag | Thermal printing with pre-heating resistor elements - energised by actual data and by clock pulse of variable width and height |
| JPH02270573A (en) * | 1989-04-13 | 1990-11-05 | Murata Mach Ltd | Thermosensitive recording device in facsimile and the like |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2715917B2 (en) | 1998-02-18 |
| JPH0825682A (en) | 1996-01-30 |
| CN1118746A (en) | 1996-03-20 |
| KR960003975A (en) | 1996-02-23 |
| TW253950B (en) | 1995-08-11 |
| KR100227476B1 (en) | 1999-11-01 |
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