CN100400291C - Control circuit of ink-ejecting head - Google Patents
Control circuit of ink-ejecting head Download PDFInfo
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- CN100400291C CN100400291C CNB2005100890273A CN200510089027A CN100400291C CN 100400291 C CN100400291 C CN 100400291C CN B2005100890273 A CNB2005100890273 A CN B2005100890273A CN 200510089027 A CN200510089027 A CN 200510089027A CN 100400291 C CN100400291 C CN 100400291C
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Abstract
The invention relates to a control circuit of ink ejector, which comprises the first resistance element and the ejector emission circuit, wherein one end of first resistance element is connected to the address line; the ejector emission circuit comprises two inputs, while one receives select signal and another is connected to another end of first resistance element, to adjust the voltage of another of first resistance element, via the select signal.
Description
Technical field
The present invention relates to a kind of ink gun (printhead) circuit, and particularly relate to a kind of control circuit of ink-ejecting head.
Background technology
Computer is the modern instrument that everyone nearly all can touch, generally speaking, the mode that the data after the Computer Processing will be shown, except on display, showing, also has other many mode, as printer is exactly one of normal a kind of output equipment that uses, and it can be with outputs such as literal, data, figures on paper.
The kind of current printer roughly can be divided three classes, be respectively three kinds of line dot matrx, ink-jet printer and laser printers, the advantage of these three kinds of printers is not quite similar, so general user can choose dissimilar printers according to the difference of purposes.
With ink-jet printer, the mode of its work is that the ink with one or more different colours is contained in the different ink cartridges, by nozzle with small particles of ink spray printing on paper, form literal, lines or picture, the ink-jet printer of some phase chip level, the ink cartridges that also can add pink and powderblue to produce more polychrome rank, prints more abundant colors.
Please refer to Fig. 1, it is the inkjet printing drive circuit of the 6th, 299, No. 292 patents of the U.S..As shown in FIG., it has comprised 16 groups ink gun matrix 105, and has comprised 13 heating resistors (heater) H in each group ink gun matrix 105.The working method of this drive circuit is by behind decoder (decoder) 109 receiving printing orders, send the address decode signal of ink gun according to print command, heating resistor H at particular address heats with decision, allows ink be sprayed by nozzle after heating.
Wherein, decoder 109 can be sent ink gun matrix address signal AD1～AD16, and these two kinds of address signals of heating resistor address signal A1～A13, ink gun matrix address signal AD1～AD16 is that decision drives specific ink gun matrix 105, and heating resistor address signal A1～A13 is specific heating resistor H in the decision driving ink gun matrix 105.First termination of each heating resistor H is received voltage signal V, whether second end then controls its conducting by two switches, these two switches are made up of field-effect transistor (transistor) 101 and 103 respectively, the gate terminal of field-effect transistor 103 receives ink-jet matrix address signal, source terminal (source) (when field-effect transistor is the CMOS field-effect transistor) receives the heating resistor address signal, when the source terminal of field-effect transistor 103 with the address signal activation simultaneously of gate terminal (gate) time, its drain electrode end (drain) (when field-effect transistor is the CMOS field-effect transistor) can produce current signal and be sent to a gate terminal of imitating crystal 101, the source electrode of field-effect transistor 101-drain electrode end meeting conducting at this moment because receiving current signal, therefore heating resistor H also can begin to heat, and prepares the emission ink.
Please refer to Fig. 2, it is the inkjet printing drive circuit of the 5th, 867, No. 183 patents of the U.S..As shown in FIG., it has comprised ink gun driver element 201, and ink gun ink output unit 211,213 two parts.In ink gun driver element 201, comprise driver of ink-jet head 203 and ink gun and selected circuit 205, the mode of operation of this inkjet printing drive circuit, be by one group of control bus signal 207 of driver of ink-jet head 203 outputs, and select circuit 205 outputs one group selection bus signals 209 by ink gun, by these two groups of bus signals control in the ink-jet printer the nozzle activation whether.
Ink gun ink output unit 211 has comprised enable circuit 215, constitute the nozzle radiating circuit 225～231 of ink gun matrix (not shown), and nozzle 233, wherein enable circuit is made up of a plurality of field-effect transistor, in this invention, be by field-effect transistor 217,219,221,223 4 form, the drain electrode end of each field-effect transistor can receive pairing control signal in the control bus signal 207, and gate terminal can receive and selects in the bus signals 209 institute's correspondence independently to select signal, when the drain electrode end of same field-effect transistor and gate terminal are enabled simultaneously, its source terminal (output) can produce current signal, this current signal can drive its nozzle radiating circuit that is electrically connected, be electrically connected nozzle radiating circuit 225 as field-effect transistor 217, and field-effect transistor 219 is electrically connected nozzle radiating circuit 227, remove to drive nozzle 233 by the nozzle radiating circuit again, with the emission ink.And the operation principle of another group ink gun ink output unit 213 is then identical with aforesaid ink gun ink output unit 211.Wherein pairing control signal promptly is to be used for its corresponding ink gun matrix of Selective Control in the control bus signal 207.
Yet this kind way can cause bigger ink-jet to postpone, and the accurate position of its driving is low.Moreover, owing to added a field-effect transistor 217 as gauge tap, so the possibility of its element fault also can be along with increase, qualification rate will descend relatively.
Summary of the invention
In view of the foregoing, purpose of the present invention just provides a kind of control circuit of ink-ejecting head, and it can reduce the ink-jet delay, and enhancement drives accurate position, minimizing element fault and raising qualification rate.
Other purpose of the present invention and advantage can obtain the understanding in a nearly step from the disclosed technical characterictic of the present invention.
Based on above-mentioned one of them individual or part or all of purpose or other purpose, the present invention proposes a kind of control circuit of ink-ejecting head, and it comprises first impedor and nozzle radiating circuit.Wherein, first impedor, one end is electrically connected to address wire; The nozzle radiating circuit then comprises two inputs, and one of them input receives selects signal, and another input then is electrically connected to the first impedor other end, and according to selecting signal to adjust the current potential of the first impedor other end.
In one embodiment of the invention, aforesaid nozzle radiating circuit comprises bleeder mechanism, control device, switch and heating resistor.Bleeder mechanism receives selects signal, and according to selecting signal to control the corresponding control signal of output.Control device is electrically connected between the first impedor other end and the some preset potential, and it receives aforesaid control signal, decides first impedor electrical connection between the preset potential therewith according to this control signal.The formed circuit of switch ends is that the current potential according to the first impedor other end determines whether opening; One end of heating resistor is electrically connected to an operating potential, and the other end then is electrically connected an end of switch so far.
In another embodiment of the present invention, aforesaid control device comprises a transistor, and this transistor has control end, first and second signal in-out end.Wherein, control end receives aforesaid control signal, and the first signal in-out end is electrically connected the aforementioned first impedor other end, and the secondary signal in-out end then is electrically connected aforesaid preset potential.In addition, control device also may further include one second impedor.This second impedor end is electrically connected with the aforementioned first impedor other end, and this second impedor other end then is electrically connected aforesaid preset potential.
In another embodiment of the present invention, aforesaid bleeder mechanism comprises two transistors, and each transistor has control end and first and second signal in-out end respectively.Wherein, the control end of the first transistor and the first signal in-out end are electrically connected to a certain operating potential, and the first signal in-out end of transistor seconds is electrically connected with the secondary signal in-out end of the first transistor, and aforesaid control signal is provided.Moreover the control end of transistor seconds receives aforesaid selection signal, and its secondary signal in-out end is electrically connected a certain preset potential.In addition, two transistors that transistor is same type in the present embodiment.
In another embodiment of the present invention, aforesaid bleeder mechanism comprises two veriform transistors, and each transistor has control end and first and second signal in-out end respectively.Wherein, the control end of first transistor npn npn receives selects signal, and its first signal in-out end then is electrically connected a certain operating potential.The control end of second transistor npn npn receives aforesaid selection signal, and its first signal in-out end is electrically connected and provides control signal with the secondary signal in-out end of first transistor npn npn, and its secondary signal in-out end then is electrically connected a certain preset potential.
In another embodiment of the present invention, aforesaid bleeder mechanism comprises a resistance and a transistor.Wherein, resistance one end is electrically connected a certain operating potential, and the other end is then in order to provide aforesaid control signal.Transistor comprises control end and first and second signal in-out end, and control end receives aforesaid selection signal, and the first signal in-out end is electrically connected with the other end of aforementioned resistance, and the secondary signal in-out end then is electrically connected to a certain preset potential.
In sum, the present invention is the chance of gauge tap because of reducing with the transistor, therefore postpones except reducing ink-jet, promote and drive accurate position, reduce outside element fault and the raising qualification rate, and can avoid mistake driving that causes because of transistor or the mistake that lost efficacy and brought, and then improve reliability.Moreover impedor itself also can be treated as current-limiting resistance, therefore can reduce the chance of electrostatic breakdown inner member.
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the driver of ink-jet head of the ink-jet printer of the 6th, 299, No. 292 patents of the U.S..
Fig. 2 is the driver of ink-jet head of the ink-jet printer of the U.S.'s the 5th, 867,183 patents.
Fig. 3 is the circuit block diagram according to the control circuit of ink-ejecting head in the driver of ink-jet head of one embodiment of the invention.
Fig. 4 is the circuit diagram according to the control circuit of ink-ejecting head of one embodiment of the invention.
Fig. 5 is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.
Fig. 6 is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.
Fig. 7 is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.
Fig. 8 is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.
Fig. 9 is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.
The main element description of symbols
RP: first impedor
M1～M5: transistor
H, Rh, 330: heating resistor
Rinv, R1～R3: resistance
SEL, SEL1, SEL2: select signal
A: address signal
P: operating potential
IN1, IN2: input
N1～N3: node
101,103,217～223: field-effect transistor
105: the ink gun matrix
109: decoder
201: the ink gun driver element
203: driver of ink-jet head
20: ink gun is selected circuit
207: the control bus signal
209: select bus signals
211,213: ink gun ink output unit
215: enable circuit
225～231: the nozzle radiating circuit
233: nozzle
AD1～AD16: ink gun matrix address signal
A1～A13: heating resistor address signal
30: control circuit of ink-ejecting head
32: the nozzle radiating circuit
300: bleeder mechanism
310: control device
320: switch
The specific embodiment
Please refer to Fig. 3, it is the circuit block diagram according to the control circuit of ink-ejecting head in the ink-jet driving circuit of one embodiment of the invention.In the present embodiment, control circuit of ink-ejecting head 30 has comprised one first impedor RP and nozzle radiating circuit 32.The end of first impedor (resistance element) RP is electrically connected to address wire with receiver address signal (address signal) A; Nozzle radiating circuit 32 comprises two input IN1 and IN2, and input IN2 receives and selects signal SEL, and input IN1 then is electrically connected to the other end of the first impedor RP.By this, nozzle radiating circuit 32 is able to according to selecting signal SEL to adjust the current potential of input IN1.The first impedor RP resistance for example be at 0.5 ohm (Ω) between 50k ohm, preferred values at 1k ohm between 5k ohm; Shown in Figure 3 in addition providing held resistance R 1 and the R3 that presses effect, and its resistance for example is between 100k ohm at 10 ohm.
In addition, bleeder mechanism 300, control device 310, switch 320 and heating resistor 330 have been comprised in the nozzle radiating circuit 32 in the present embodiment.Wherein, bleeder mechanism 300 is used for receiving selects signal SEL, and according to selecting signal SEL to control the corresponding control signal CTRL of output.Control device 310 is electrically connected between the other end (that is, input IN1) and earth potential of the first impedor RP, and it receives control signal CTRL to determine the electrical connection between the first impedor RP and the earth potential in view of the above.In other words, whether the first impedor RP can be electrically connected to earth potential, or the resistance value between the first impedor RP and the earth potential, can be the target that control device 310 is adjusted according to control signal CTRL.Moreover whether the formed circuit in switch 320 two ends is to open with decision according to the current potential of input IN1, and an end of heating resistor 330 is electrically connected to operating potential P, and the other end then is electrically connected on the switch 330.This operating potential for example is between 3.5 volts to 20 volts.
Though the internal circuit of nozzle radiating circuit 32 has been depicted a possible form in the present embodiment, but the person of ordinary skill in the field should know, each manufacturer is all different for the design of nozzle radiating circuit 32, so the present invention's application is when being not restricted to the possible form of this kind.In other words, so long as use the preposition element of the first impedor RP as input IN1, and nozzle radiating circuit 32 can be according to selecting signal SEL, or the current potential of input IN2 adjusts the current potential of input IN1, has been to have met spiritual place of the present invention just.
Next will enumerate a plurality of embodiment so that the person of ordinary skill in the field can implement the present invention easily.
See also Fig. 4, it is the circuit diagram according to the control circuit of ink-ejecting head of one embodiment of the invention.As shown in the figure, in the present embodiment, the control device 310 of Fig. 3 has comprised a N transistor npn npn M5, switch 320 comprises a N transistor npn npn M2 too, bleeder mechanism 300 has then comprised two N transistor npn npn M3 and M4, and each transistor all comprises a control end (as: grid of MOS) and two signal in-out ends (as: source electrode of MOS and drain electrode) respectively.
In the present embodiment, the control end of transistor M3 and a signal in-out end are electrically connected to operating potential P simultaneously, and its another signal in-out end then is electrically connected on node N3 with one of transistor M4 signal in-out end, and provides aforesaid control signal CTRL with this.Moreover the control end of transistor M4 receives selects signal SEL, and its another signal in-out end is electrically connected to some preset potential (being generally VSS or ground connection).Because the characteristic of circuit, two transistors in the present embodiment are necessary for the transistor of same type, for example: the N transistor npn npn.But present embodiment is not limited to adopt the N transistor npn npn, also can adopt the P transistor npn npn, as long as add phase inverter (inverter) at suitable relative position, can reach the present invention's effect.
Rely on the above-mentioned operation that comprises the bleeder mechanism of transistor M3 and M4, select signal SEL can by control transistor M4 whether conducting change the current potential of control signal CTRL.Because the control end of transistor M5 receives control signal CTRL, and two signal in-out ends are connected to node N2 (being equivalent to the input IN1 among Fig. 3) and a preset potential respectively, therefore by the current potential that changes control signal CTRL, just can determine whether transistor M5 opens, and then change the current potential of node N2.In addition, because the control end of transistor M2 is electrically connected to node N2, and two signal in-out ends are connected to node N1 and a preset potential respectively, therefore just can control transistor M2 by the current potential that changes node N2 and whether open, and and then determine whether heating resistor Rh can begin to produce heat because of flowing of electric current.
Next please refer to Fig. 5, it is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.As shown in the figure, the difference of present embodiment and Fig. 4 embodiment be transistor M3 and transistor M4 be veriform transistor (in the present embodiment, transistor M3 is the P transistor npn npn, and transistor M4 then is the N transistor npn npn), and the control end of transistor M3 receives selection signal SEL too.In view of the above, select signal SEL to control the switch of transistor M3 and M4 simultaneously.
Next please refer to Fig. 6, it is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.As shown in the figure, the difference of present embodiment and Fig. 4 embodiment is to replace transistor M3 with resistance R inv.Because the characteristic of resistance is firm than transistor, therefore except the electrostatic protection effect that the first impedor RP is provided, resistance R inv can produce the effect of electrostatic protection to internal circuit element too, thereby has increased the stability of integrated circuit.
Next please refer to Fig. 7, it is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.As shown in the figure, the discrepancy of present embodiment and Fig. 6 embodiment is that the operating potential that resistance R inv is connect is to come to select signal SEL.
Next please refer to Fig. 8, it is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.As shown in the figure, the discrepancy of present embodiment and Fig. 4 embodiment is except transistor M5, has comprised also in the aforesaid control device that a resistance R 2 (second impedor) is to accelerate the velocity of discharge of node N2.Because resistance R 2 be pattern in parallel with transistor M5, so when transistor M5 conducting, in parallel between resistance R 2 and the transistor M5 will make the resistance value reduction, thereby quickening node N2 current potential is drop-down.Yet, must be noted that in order to make transistor M2 switch normally, so the resistance value of resistance R 2 must be more many greatly than the resistance value of the first impedor RP, for example more than 10 times.For instance, if the resistance value of the first impedor RP is 1K ohm, then the resistance value of resistance R 2 is just preferably more than 10K ohm.
Next please refer to Fig. 9, it is the circuit diagram according to the control circuit of ink-ejecting head of another embodiment of the present invention.As shown in the figure, how the discrepancy of present embodiment and Fig. 4 embodiment has been a transistor M1 who is in parallel with first impedor (being plotted as resistance herein) RP.The control of this transistor M1 by selecting signal SEL is to determine whether it opens.
In sum, in each embodiment of the present invention, the use of the first impedor RP has brought great benefit.Only utilize transistor M1 signal can be passed to the way of node N2 with the control address wire as switch with respect to known technology, the present invention utilizes the mode of the open address wire of the first impedor RP to the charge path of node N2, make beginning ink-jet need heat to heating resistor Rh in, can remove the reaction time of transistor M1 and node N2 is charged with turn-on transistor M2 at once.Therefore, the present invention can reduce ink-jet and postpone, and promotes driving accurate position, reduces element fault and improves qualification rate.Also can avoid mistake driving that causes because of transistor or the mistake that lost efficacy and brought in addition, and then improve reliability.Moreover impedor itself also can be treated as current-limiting resistance, therefore can reduce the chance of electrostatic breakdown inner member.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any person of ordinary skill in the field; without departing from the spirit and scope of the invention; when can doing a little change and improvement, so the present invention's protection domain is as the criterion when looking the claim person of defining.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not the interest field that is used for limiting the present invention.
Claims (11)
1. control circuit of ink-ejecting head comprises:
First impedor, an end is electrically connected to address wire; And
The nozzle radiating circuit, comprise two inputs, one of them input receives selects signal, and another input is electrically connected to this first impedor other end, this nozzle radiating circuit according to this selection signal to adjust the current potential of this first impedor other end.
2. the control circuit of ink-ejecting head according to claim 1 is characterized in that this nozzle radiating circuit comprises:
Bleeder mechanism receives this selection signal, and controls the corresponding control signal of output according to this selection signal;
Control device is electrically connected between this first impedor other end and the preset potential, receives this control signal to decide the electrical connection between this first impedor and this preset potential according to this control signal;
Whether switch opens the formed circuit of this switch ends according to the current potential of this first impedor other end with decision; And
Heating resistor, an end is electrically connected to operating potential, and the other end is electrically connected to this switch.
3. the control circuit of ink-ejecting head according to claim 2, it is characterized in that this control device comprises transistor, this transistor has control end, first and second signal in-out end, control end receives this control signal, the first signal in-out end is electrically connected this first impedor other end, and the secondary signal in-out end is electrically connected this preset potential.
4. the control circuit of ink-ejecting head according to claim 3, it is characterized in that this control device also comprises second impedor, this second impedor end is electrically connected with this first impedor other end, and this second impedor other end is electrically connected this preset potential.
5. the control circuit of ink-ejecting head according to claim 2 is characterized in that this bleeder mechanism comprises:
The first transistor comprises control end, first and second signal in-out end, and the control end and the first signal in-out end are electrically connected to operating potential; And
Transistor seconds, comprise control end, first and second signal in-out end, the first signal in-out end of this transistor seconds is electrically connected and provides this control signal with the secondary signal in-out end of this first transistor, the control end of this transistor seconds receives this selection signal, and the secondary signal in-out end of this transistor seconds is electrically connected preset potential
Wherein, this first transistor and this transistor seconds are the transistor of same type.
6. the control circuit of ink-ejecting head according to claim 5 is characterized in that this first transistor and this transistor seconds are respectively the N transistor npn npn.
7. the control circuit of ink-ejecting head according to claim 2 is characterized in that this bleeder mechanism comprises:
First transistor npn npn comprises control end, first and second signal in-out end, and the control end of this first transistor npn npn receives this selection signal, and the first signal in-out end is electrically connected operating potential; And
Second transistor npn npn, comprise control end, first and second signal in-out end, the control end of this second transistor npn npn receives this selection signal, the first signal in-out end of this second transistor npn npn is electrically connected and provides this control signal with the secondary signal in-out end of this first transistor npn npn, and the secondary signal in-out end of this second transistor npn npn is electrically connected preset potential.
8. the control circuit of ink-ejecting head according to claim 7 is characterized in that this first transistor npn npn is the P transistor npn npn, and this second transistor npn npn is the N transistor npn npn.
9. the control circuit of ink-ejecting head according to claim 2 is characterized in that this bleeder mechanism comprises:
Resistance, this resistance one end is electrically connected operating potential, and the other end provides this control signal; And
Transistor comprises control end, first and second signal in-out end, and control end receives this selection signal, and the first signal in-out end is electrically connected with the other end of this resistance, and the secondary signal in-out end is electrically connected preset potential.
10. the control circuit of ink-ejecting head according to claim 9 is characterized in that this operating potential is this selection signal.
11. the control circuit of ink-ejecting head according to claim 1 is characterized in that also comprising:
Transistor comprises control end, first and second signal in-out end, and control end receives this selection signal, and the first signal in-out end is electrically connected to this first impedor end, and the secondary signal in-out end is electrically connected to this first impedor other end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100890273A CN100400291C (en) | 2005-08-03 | 2005-08-03 | Control circuit of ink-ejecting head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100890273A CN100400291C (en) | 2005-08-03 | 2005-08-03 | Control circuit of ink-ejecting head |
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| CN1907709A CN1907709A (en) | 2007-02-07 |
| CN100400291C true CN100400291C (en) | 2008-07-09 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5867183A (en) * | 1996-01-11 | 1999-02-02 | Lexmark International, Inc. | Apparatus for driving multiple ink jet printheads with a single set of drive outputs |
| US6079805A (en) * | 1996-06-12 | 2000-06-27 | Brother Kogyo Kabushiki Kaisha | Recording device capable of setting drive voltage of print head based on analog signals |
| JP2000280467A (en) * | 1999-03-29 | 2000-10-10 | Seiko Epson Corp | Ink jet recorder and manufacture thereof |
| US6299292B1 (en) * | 1999-08-10 | 2001-10-09 | Lexmark International, Inc. | Driver circuit with low side data for matrix inkjet printhead, and method therefor |
| CN1403280A (en) * | 2001-08-29 | 2003-03-19 | 国际联合科技股份有限公司 | Chip for jetting print head of ink cartridge and its making process |
| CN1524697A (en) * | 2003-02-26 | 2004-09-01 | 国际联合科技股份有限公司 | Apparatus and method for driving printing head |
-
2005
- 2005-08-03 CN CNB2005100890273A patent/CN100400291C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5867183A (en) * | 1996-01-11 | 1999-02-02 | Lexmark International, Inc. | Apparatus for driving multiple ink jet printheads with a single set of drive outputs |
| US6079805A (en) * | 1996-06-12 | 2000-06-27 | Brother Kogyo Kabushiki Kaisha | Recording device capable of setting drive voltage of print head based on analog signals |
| JP2000280467A (en) * | 1999-03-29 | 2000-10-10 | Seiko Epson Corp | Ink jet recorder and manufacture thereof |
| US6299292B1 (en) * | 1999-08-10 | 2001-10-09 | Lexmark International, Inc. | Driver circuit with low side data for matrix inkjet printhead, and method therefor |
| CN1403280A (en) * | 2001-08-29 | 2003-03-19 | 国际联合科技股份有限公司 | Chip for jetting print head of ink cartridge and its making process |
| CN1524697A (en) * | 2003-02-26 | 2004-09-01 | 国际联合科技股份有限公司 | Apparatus and method for driving printing head |
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