CN1219642C - Ink-jet printer ink-ejecting unit open circuit and short circuit testing process and apparatus - Google Patents
Ink-jet printer ink-ejecting unit open circuit and short circuit testing process and apparatus Download PDFInfo
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- CN1219642C CN1219642C CN 02123265 CN02123265A CN1219642C CN 1219642 C CN1219642 C CN 1219642C CN 02123265 CN02123265 CN 02123265 CN 02123265 A CN02123265 A CN 02123265A CN 1219642 C CN1219642 C CN 1219642C
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Abstract
The present invention provides a method for testing an open circuit and a short circuit to an ink jet unit on an ink jet device and a relevant device. The ink jet device is provided with at least one ink jet unit which can receive driving energy to carry out ink jet printing after the ink jet unit receives an ink jet control signal. The method for testing the short circuit comprises: stopping sending the ink jet control signal and the driving energy to the ink jet unit, and measuring the current received by the ink jet unit. The method for testing the open circuit comprises: stopping sending the driving energy to the ink jet unit, but sending the ink jet control signal to the ink jet unit, and measuring the current received by the ink jet unit.
Description
Technical field
The present invention provides that a kind of ink jet unit to an ink-jet recording apparatus is opened a way or the method and the relevant apparatus of short-circuit test, refer to especially a kind of can be at method and the relevant apparatus that needn't can test with each ink jet unit of print drive drives.
Background technology
Inkjet-printing device is as ink-jet printer, because its cheap price, outstanding print quality have become one of most popular in recent years output equipment.
Please refer to Fig. 1.Fig. 1 is the circuit diagram of an existing printer 10 (as United States Patent (USP) the 5th, 736, No. 997 revealers of institute).Being provided with a plurality of ink jet unit A11 to A13, A21 to A23 that are arranged as matrix and A31 to A33, in the printer 10 is used for controlling the control circuit 12, of printing action and is used for address circuit 16A, that the power circuit 14, of transferring electric power is used for controlling each ink jet unit and is used for driving the drive circuit 16B of each ink jet unit and a testing circuit 18.The structure of each ink jet unit is identical, is example with ink jet unit A13, is provided with the nozzle K of a field effect (field effect) transistor T, a heating element D and a correspondence among the ink jet unit A13.The gate pole Tc of transistor T is as the control end of ink jet unit A13, in addition in the two poles of the earth, and source ground, drain electrode is connected in heating element D.The end of heating element D except being electrically connected with transistor T also has the input of the other end as ink jet unit A13, is connected in node Ti.Heating element D is generally a thermal resistance, is located in the ink chamber (not shown); In case heating element D has electric current to pass through, heating element D just can transfer electric energy to heat energy and come ink in the heated ink hydroecium, and ink is heated above certain limit, will reach the effect of inkjet printing by the nozzle K ejection of correspondence.
Cooperate the ink jet unit that is arranged as triplex row (row), address circuit 16A also has three address wire Aa1, Aa2 and Aa3, and address wire Aa1 is connected in the control end of ink jet unit A11, A12 and A13; Address wire Aa2 is connected in the control end of ink jet unit A21, A22 and A23, by that analogy.Cooperate the ink jet unit that is arranged as three row (column), drive circuit 16B has three drive wire Pa1, Pa2 and Pa3; Just as shown in Figure 1, drive wire Pa1 is connected in the input of ink jet unit A11, A21 and A31, by that analogy.When printer 10 will print figure, control circuit 12 can determine which ink jet unit wants ink-jet, which ink jet unit not to need ink-jet, controls each ink jet unit ink-jet (or not ink-jet) via Lai Do of address circuit 16A, drive circuit 16B again according to the figure that will print.For instance, if ink jet unit A13 wants ink-jet, address circuit 16A will select address wire Aa1, the energy that provides with power circuit 14 raises the voltage of address wire Aa1, allow transistor T conducting among the ink jet unit A13, make ink jet unit A13 form a conduction approach between extremely holding by its input (node Ti); Drive circuit 16B also can select drive wire Pa3 simultaneously, the electric energy that utilizes power circuit 14 to provide improves the voltage of drive wire Pa3, and the drive current Id that allows power circuit 14 provide can flow into ink jet unit A13 via drive wire Pa3, process node Ti, and be heat energy by the heating element D among the ink jet unit A13 with the driving Conversion of energy of this electric current, order about ink jet unit A13 ink-jet.Relatively, if ink jet unit A12 does not need ink-jet, control circuit 12 may command drive circuit 16B are maintained low level with drive wire Pa2, even address wire Aa1 is a high voltage like this, drive wire Pa2 can not provide electric current to ink jet unit A12 yet.Also do not need ink-jet as ink jet unit A23, control circuit also may command address circuit 16A is maintained at low-voltage with the voltage of address wire Aa2, makes the not conducting of transistor among the ink jet unit A23, allow among the ink jet unit A23 extremely hold by input between just as opening circuit; Even the drive wire Pa3 that connects of ink jet unit A23 is a high voltage like this, opening circuit among the ink jet unit A23 also can make the ink jet unit A23 can received current, and the heating element among the ink jet unit A23 can not heat ink-jet yet certainly.
With above-mentioned control method, each ink jet unit of printer 10 forms light and shade with regard to energy ink-jet (or not ink-jet) the figure that causes, and reaches the purpose of inkjet printing.But in the printer of reality, because manufacturing process defective, the assembling process of circuit itself are improper, or the artificial damage of user when using, or the thermal effect of accumulation during the printer running or the like, all can cause the internal circuit of printer 10 to wreck.Such destruction can be divided into two types, and a kind of is the short circuit phenomenon, and a kind of is the open circuit phenomenon of circuit.Picture is in Fig. 1, and just there is open circuit phenomenon (mistake when connecting as or assembling not good because of the circuit production process) ink jet unit A33 inside, and making has an open circuit OC among the ink jet unit A33.So, whether the address wire Aa3 no matter ink jet unit A33 connects is high voltage, and the current energy of drive circuit all can't transfer among the ink jet unit A33 via drive wire Pa3, and causing ink jet unit A33 to incite somebody to action always can't controlled ink-jet.
On the other hand, as in the ink jet unit A32 of Fig. 1, just there is the phenomenon of short circuit to take place (may be in this ink jet unit heating element or transistor damage cause), makes to form a short circuit (or impedance is very low) conduction approach SC among the ink jet unit A32.The approach SC that conducts electricity this moment can't be controlled by the address wire Aa3 that ink jet unit A32 connects; In other words, be low no matter the voltage of address wire Aa3 is height, in case drive circuit 16B improves the voltage of drive wire Pa2, drive wire Pa2 will directly directly be electrically connected with the ground end via the extremely low conduction approach SC of impedance; The electric current that this moment, drive wire Pa2 upward conducted will become high singularly because of impedance is extremely low, and the high heat that high electric current causes not only may be damaged other ink jet units or the drive wire Pa2 itself that is connected in drive wire Pa2; Because the current energy of drive wire Pa2 is to see through drive circuit 16B supply by power circuit 14, the high electric current of drive wire Pa2 more may burn the control logic circuit among the drive circuit 16B, and causes the overheated damage of power circuit 14.So far the function of printer 10 also will can't be brought into play fully, even injures the user because of overheated.
For detecting above-mentioned short circuit phenomenon, be provided with testing circuit 18 in the existing printer 10.Cooperate three drive wires, also Fen Do is provided with three diode D1 to D3 ， Fen Do and is connected in drive wire Pa1 to Pa3 in the testing circuit 18.Also be provided with a comparator Vc1 in addition in the testing circuit 18, be used for producing detection signal 18S.Comparator Vc1 has an anode (being designated as among Fig. 1+) and a negative terminal (being designated as among Fig. 1-), and negative terminal is connected in diode D1 to D3, reaches a resistance R 1; The bleeder circuit that anode is connected in resistance R 2, R3 utilizes power supply Vcc Group to become.The principle of existing testing circuit 18 runnings is as follows.When testing circuit 18 will detect short circuit destruction; If all there is not in each ink jet unit short circuit to destroy, the then all contrary conducting partially and not of diode D1 to D3, resistance R 1 does not have electric current yet to be passed through, and makes the voltage of comparator Vc1 be maintained at the high voltage of power Vcc.In comparison, the anode of comparator Vc1 because the voltage of power Vcc by resistance R 2, R3 dividing potential drop, necessarily less than the voltage of negative terminal, the comparator Vc1 relatively voltage of its negative terminal is higher than the voltage of anode, just can judge that there is no short circuit destroys generation, and produce corresponding detection signal 18S.Otherwise, if the example shown in the image pattern 1, the ink jet unit A32 that is connected in drive wire Pa2 has short circuit phenomenon, the voltage of drive wire Pa2 will reduce because of the conduction approach SC of short circuit, makes diode D2 conducting, and electric current is passed through by resistance R 1, cause the voltage of comparator Vc1 negative terminal to reduce, this moment, the negative terminal voltage of comparator Vc1 will be lower than positive terminal voltage, and comparator just can judge that short circuit destruction takes place, and reacts among the detection signal 18S.
Yet, in above-mentioned prior art, if there has been short circuit condition to take place in the ink jet unit, in case improve each drive wire voltage with drive circuit 16B, then the destruction of aforementioned high electric current will be spread fast, and cause the damage of drive circuit, address circuit and power circuit, and though comparator Vc1 can detect situation of short circuit really, the destruction that may can't avoid short circuit phenomenon to derive.In addition, aforementioned prior art also can't be detected the open circuit phenomenon.Because when improving the drive wire level, the open circuit phenomenon in the ink jet unit can't influence the level (because no longer being connected in drive wire) of drive wire, and also therefore existing testing circuit 18 can't detect the open circuit phenomenon in the ink jet unit.
Summary of the invention
Therefore, main purpose of the present invention is to provide a kind of and can opens a way in printer and the method and the relevant apparatus of short-circuit detecting, even short circuit phenomenon takes place, also can not injure drive circuit and other interlock circuits in testing process.
According to the present invention, whether the ink jet unit that a kind of detection one ink discharge device is provided the method for short circuit, and this ink discharge device includes:
One drive circuit is used to provide energy;
At least one ink jet unit, this ink jet unit are provided with nozzle, an input and a control end of a correspondence; When the control end of this ink jet unit received an ink-jet control signal, this ink jet unit can make this corresponding nozzle ink jet by the energy that this input receives this drive circuit and provides;
And this method includes:
Stop to send the control end that this ink-jet controls signal to this ink jet unit;
Stop to provide the input of energy to this ink jet unit with this drive circuit; And
Measure the electric current that this ink jet unit is received by this input,
Wherein, when measuring the electric current that this ink jet unit receives by this input,, judge that then this ink jet unit is short circuit if the electric current that this input receives differs from a preset value;
This ink discharge device comprises a current providing circuit in addition, and it has a current terminal; This current providing circuit can be according to the impedance of this current terminal and is supplied the electric current of a correspondence by this current terminal; In the time will measuring the electric current that this ink jet unit receives by this input, be that the input with this ink jet unit is connected to this current terminal.
According to the present invention, the method that provides a kind of ink jet unit that detects an ink discharge device whether to open a way, this ink discharge device includes:
One drive circuit is used to provide energy;
At least one ink jet unit, this ink jet unit are provided with nozzle, an input and a control end of a correspondence; When the control end of this ink jet unit received an ink-jet control signal, this ink jet unit can make this corresponding nozzle ink jet by the energy that this input receives this drive circuit and provides;
And this method includes:
Send the control end that this ink-jet controls signal to this ink jet unit; And
Measure the electric current that this ink jet unit is received by this input,
Wherein, when measuring the electric current that this ink jet unit receives by this input,, judge that then this ink jet unit is open circuit if the electric current that this input receives differs from a preset value;
This ink discharge device comprises a current providing circuit in addition, and it has a current terminal; This current providing circuit can be according to the impedance of this current terminal and is supplied the electric current of a correspondence by this current terminal; In the time will measuring the electric current that this ink jet unit receives by this input, be that the input with this ink jet unit is connected to this current terminal.
According to the present invention, a kind of ink-jet recording apparatus is provided, it includes:
One drive circuit is used to provide energy;
One address circuit is used to provide an ink-jet control signal;
At least one ink jet unit, this ink jet unit are provided with nozzle, an input and a control end of a correspondence; This control end is connected in this address circuit, and this input is connected in this drive circuit, and when the control end of this ink jet unit received this ink-jet control signal, this ink jet unit can make this corresponding nozzle ink jet by the energy that this input receives this drive circuit and provides;
One current providing circuit, it has a current terminal, and this current providing circuit can provide the electric current of a correspondence according to the impedance of this current terminal;
One switch is connected between the input and this current providing circuit of this ink jet unit, is used for controlling being electrically connected between this input and this current terminal; When this switch conduction, this input can be electrically connected with this current terminal, and when this switch cut out, this input can no longer be electrically connected with this current terminal; And
One measuring circuit is used for producing according to the electric current that this current providing circuit provides in this current terminal the detection signal of a correspondence,
When wherein being electrically connected with this current providing circuit when this switch conduction and with this ink jet unit, this drive circuit can stop to provide energy to this ink jet unit;
When wherein being electrically connected with this current providing circuit when this switch conduction and with this ink jet unit, this drive circuit can stop to provide energy to this ink jet unit, and this testing circuit can be when this address circuit also stops to provide this ink-jet control signal, and the electric current that provides in this current terminal according to this current providing circuit produces the short-circuit detection signal of a correspondence.
According to the present invention, a kind of ink-jet recording apparatus is provided, it includes:
One drive circuit is used to provide energy;
One address circuit is used to provide an ink-jet control signal;
At least one ink jet unit, this ink jet unit are provided with nozzle, an input and a control end of a correspondence; This control end is connected in this address circuit, and this input is connected in this drive circuit, and when the control end of this ink jet unit received this ink-jet control signal, this ink jet unit can make this corresponding nozzle ink jet by the energy that this input receives this drive circuit and provides;
One current providing circuit, it has a current terminal, and this current providing circuit can provide the electric current of a correspondence according to the impedance of this current terminal,
Wherein, described black tape deck also includes:
One switch is connected between the input and this current providing circuit of this ink jet unit, is used for controlling being electrically connected between this input and this current terminal; When this switch conduction, this input can be electrically connected with this current terminal, and when this switch cut out, this input can no longer be electrically connected with this current terminal; And
One measuring circuit is used for producing according to the electric current that this current providing circuit provides in this current terminal the detection signal of a correspondence,
Wherein, when being electrically connected with this current providing circuit when this switch conduction and with this ink jet unit, this drive circuit can stop to provide energy to this ink jet unit;
When being electrically connected with this current providing circuit when this switch conduction and with this ink jet unit, this drive circuit can stop to provide energy to this driver element, and this testing circuit can be when this address circuit provides this ink-jet control signal, and the electric current that provides in this current terminal according to this current providing circuit produces the open circuit detection signal of a correspondence.
When the present invention carried out short-circuit test, the address wire of each ink jet unit can be maintained at low-voltage, and drive circuit also can stop to drive each ink jet unit, and changing by the testing circuit among the present invention provides current energy; In case short circuit takes place, the short circuit ink jet unit will absorb bigger electric current, and detected circuit detects.In case detect short circuit phenomenon, can further stop the follow-up running of printer, keep printer and user's safety.
Also can specify ink jet unit to carry out open test to one separately in the present invention; When carrying out open test, this specifies the address wire meeting boosted voltage of ink jet unit, and drive wire then stops to drive this appointment ink jet unit, changes by the testing circuit among the present invention to provide current energy to it.If this specifies not conducting electric current of ink jet unit, represent this ink jet unit that open circuit has taken place and damage.After detecting the damage of appointment ink jet unit generation open circuit, just can utilize the adjacent unit of this appointment ink jet unit to replace this appointment ink jet unit ink-jet, to keep the quality of follow-up inkjet printing.
Description of drawings
Fig. 1 is the circuit diagram of an existing printer.
Fig. 2 is the circuit diagram of printer of the present invention.
Fig. 3 carries out the schematic diagram of short-circuit test for printer among Fig. 2.
Fig. 4 carries out the schematic diagram of open test for printer among Fig. 2.
Fig. 5 is the circuit diagram of another embodiment of the present invention.
Fig. 6 is the circuit diagram of third embodiment of the invention.
Embodiment
Please refer to Fig. 2.Fig. 2 is the circuit diagram of printer 20 among the present invention.Be provided with the address circuit 26A, that control circuit 22, that a plurality of ink jet unit (drawing nine among Fig. 2 is ink jet unit C11 to C13, C21 to C23 and C31 to C33 as representing Fen Do), power circuits 24, that are used to provide electric power that are arranged as matrix are used for controlling printer operation is used for controlling ink jet unit in the printer 20 and be used for driving the drive circuit 26B of ink jet unit, and be used among the present invention opening a way, the test circuit 28 of short-circuit test.The structure of each ink jet unit is identical, is example with ink jet unit C13, is provided with a field-effect transistor Q among the ink jet unit C13, and fit with nozzle Nz, is used for the heating element H of heating ink.The gate pole Nc of transistor Q is the control end of ink jet unit C13, and (ground) held at the two poles of the earth one with being connected in addition, and an end is connected in heating element H.Heating element H one end is connected in transistor Q, and the other end is connected in node Ni then as the input of ink jet unit C13.Cooperate the ink jet unit that is arranged as triplex row (row), address circuit 26A also is provided with three address wire A1 to A3; Address wire A1 is connected to the control end of ink jet unit C11, C12 and C13, by that analogy.Cooperate the ink jet unit that is arranged as three row (column), drive circuit also is provided with three drive wire P1 to P3; Drive wire P1 is connected in the input of ink jet unit C11, C21 and C31, by that analogy.The principle that printer 20 drives each ink jet unit inkjet printing is identical with printer 10; When a certain ink jet unit is wanted inkjet printing, control circuit 22 can improve through the voltage of corresponding address line with this ink jet unit control end with the electric power that power circuit 24 provides by control address circuit 26A, be equivalent to send the control end that an ink-jet controls signal to this ink jet unit, so that the transistor turns in this ink jet unit.Simultaneously, control circuit 22 also can control Driver Circuit 26B utilizes electric power that power circuit 24 provides that the voltage of the drive wire of this ink jet unit correspondence is improved, and see through this drive wire and will drive energy and inject this ink jet unit with current forms, make the heating element in this ink jet unit be able to ink is added thermal inkjet-printing.Relatively, if the control end of an ink jet unit is not received ink-jet control signal (promptly the address wire voltage of this ink jet unit control end connection does not raise), or the drive wire that input is connected to does not provide energy (voltage that is drive wire does not raise), and this ink jet unit can inkjet printing.By the method for above-mentioned control, printer 20 just can print light and shade the figure that causes.
In order to detect in each ink jet unit the generation of open circuit and short circuit phenomenon, also be provided with testing circuit 28 in the printer 20 in addition.Be provided with a current providing circuit 30A, a measuring circuit 30B in the testing circuit 28; Cooperate three drive wires in the printer 20, also Fen Do is provided with three switch S 1 to S3.In this embodiment, be to cooperate DC power supply Vcc to become a current mirror among the current providing circuit 30A with two transistor M1, M2, transistor M2 is connected in the current terminal of the utmost point of node N1 as current providing circuit 30A supply of current.The utmost point of transistor M1 then is connected in measuring circuit 30B; According to the electric current of transistor M1 injection measuring circuit 30B, measuring circuit 30B can send a detection signal 28S, the result of reaction open circuit, short-circuit test.Switch S 1 to S3 is connected between the current terminal of each drive wire and current providing circuit 30A, and each switch controls its conducting by control circuit 22 or cuts out.For instance, when switch S 1 conducting, drive wire P1 just is able to be electrically connected with node N1 via switch S 1, just the current terminal of current providing circuit 30A.When switch S 1 was closed, drive wire P1 just no longer was electrically connected with node N1 (so the switch S among Fig. 21 to S3 all in off position).When printer is normally printed, the switch on each drive wire all in off position, shown in Fig. 2.
Please refer to Fig. 3.Schematic diagram when Fig. 3 carries out short-circuit test for printer 20 among the present invention.When the present invention will carry out short-circuit test, the all address wires of address circuit 26A all can stop to send the ink-jet control signal, just allow address wire be in low-voltage state,, represent each address wire all in low-voltage so all address wires are all represented with dotted line among Fig. 3.Simultaneously, control circuit 22 also can allow 1 to the S3 conducting of all switch S, allows each drive wire P1 to P3 be able to be electrically connected (as shown in Figure 3) via node N1 with current providing circuit 30A; And drive circuit 26B can not send the driving energy yet.That is to say that drive circuit 26B can decommission does not provide electric current, make the voltage of drive wire P1 to P3 also be in floating; Looked toward drive circuit 26B by each drive wire, drive circuit 26B is a high impedance status.Therefore, also represent the no longer voltage of controlling and driving line P1 to P3 of drive circuit 26B among Fig. 3 with the dotted line of part.Under normal condition, if each ink jet unit does not all have short circuit phenomenon to take place, because the address wire of each ink jet unit is all in low-voltage, not conductings of transistor in each ink jet unit, make each drive wire P1 to P3 all not have current lead-through jointly, be equivalent to be connected with the sizable impedance of a resistance, so the electric current I 2 minimum (or essence is zero) of transistor M2 at node N1; See through the current mirror of M1, M2, the electric current I 1 of transistor M1 also can be very little, after measuring circuit 30B measures the size of electric current I 1, just can judge that there is no short circuit phenomenon in each ink jet unit takes place because of electric current I 1 is very little, and react to detection signal 28S.Relatively, if (or more than one) ink jet unit phenomenon that is short-circuited is arranged in the ink jet unit, similarly be to have formed equivalent Low ESR conduction approach SC1 because of short circuit phenomenon among the ink jet unit C32 among Fig. 3, drive wire P2 will form a low-impedance ground connection approach, and being equivalent to has a Low ESR at node N1.This moment transistor M2 just have 2 conductings of suitable electric current I, the transistor M1 of current mirror one another side is the suitable electric current I 1 of conducting similarly also; Measuring circuit 30B measures electric current I 1 and increases, and just represent short circuit phenomenon to take place, and reaction is with the detection signal 28S of short circuit.When testing circuit 28 detects short circuit phenomenon, control circuit 22 just can further stop the running of power circuit 24 and drive circuit 26B, causes follow-up high electric current to destroy to avoid short circuit phenomenon, and the prompting user notes, carries out necessary maintenance.When reality is implemented, can set a default electric current comparison value among the measuring circuit 30B, when electric current I 1 less than this preset value, representative does not have short circuit phenomenon to take place; If electric current I 1 greater than this preset value, just represents drive wire by the conduction approach conducting of short circuit, short circuit phenomenon has taken place.
Take a broad view of the above-mentioned short-circuit test process of the present invention, technology of the present invention does not as can be known need to improve via the running of the drive circuit voltage with each drive wire in test process; Even short circuit phenomenon has taken place, drive circuit, power circuit are damaged.The conducting of electric current I 2 is the electric power that provides by power Vcc in the short-circuit test of the present invention, and the virtual voltage of power Vcc drives each drive wire in the time of can looking like normal printing the voltage is so high, further avoids the damage of drive wire in the short-circuit test process.In addition, the present invention also can carry out short-circuit test one by one at each drive wire.For instance, if as long as drive wire P1 is carried out short-circuit test, as long as with switch S 1 conducting, remaining switch S 2, S3 then close, and that ink jet unit that just only is connected in drive wire P1 can influence the impedance state that node N1 connects; There is short circuit phenomenon to take place if be connected in the ink jet unit of drive wire P1, will makes node N1 be connected in Low ESR conduction approach, and electric current I 2, I1 are increased.Under this kind situation, the ink jet unit of the Shang You Do of drive wire P2, P3 of the Ji Shi Do phenomenon that is short-circuited, but, can not influence short-circuit detecting result to drive wire P1 because of switch S 2, S3 close not conducting yet.
Except above-mentioned short-circuit test, the present invention also can further carry out open test to each ink jet unit one by one.Please refer to Fig. 4.Schematic diagram when Fig. 4 carries out open test for the present invention.Suppose and will carry out open test to ink jet unit C33, then control circuit 22 can be with switch S 3 conductings on the drive wire P3 of this ink jet unit connection, and other switch S 1, S2 then close.Simultaneously, the voltage that control circuit 22 also can control address circuit 26A will connect the address wire A3 of this ink jet unit improves, so that the transistor turns in this ink jet unit; Remaining address wire then is maintained at low-voltage.In addition, during as short-circuit test, drive circuit 26B also stops to drive each drive wire.Just as shown in Fig. 4, in the time of carrying out open test to ink jet unit C33, the address wire A2 of low-voltage, A3, and the drive wire P1, the P2 that are not electrically connected with node N1 via switch represent with dotted line; That is to say that only have ink jet unit C33 by address wire A3 conducting this moment, and be electrically connected with node N1 through the switch S 3 of conducting.Under normal condition, the ink jet unit C33 phenomenon of not opening a way, the transistor among the ink jet unit C33 will be because of the high voltage conducting of address wire A3, and just as having connected a lower impedance at node N1, transistor M2 just can the suitable electric current I 2 of conducting; See through the current mirror configuration, transistor M1 is the suitable electric current I 1 of conducting accordingly also; Measuring circuit 30B is according to electric current I 1, just can judge the ink jet unit C33 phenomenon of not opening a way, and be reflected among the detection signal 28S.On the contrary, if the generation that illustrates in the ink jet unit C33 image pattern 4 open circuit phenomenon and the open circuit OC1 of not conducting is arranged, just be equivalent to connect a very large impedance of resistance at node N1, certainly the electric current I 2 of transistor M2 conducting just becomes minimum (or essence is zero), and it is very little that the electric current I 1 of related transistor M1 also becomes; Measuring circuit 30B measures electric current I 1 and diminishes, and just can judge the open circuit phenomenon has taken place among the ink jet unit C33, and react with the detection signal 28S of an open circuit.Control circuit 22 can raise in regular turn the corresponding address line voltage (and reducing remaining address line voltage) of each ink jet unit, the driving On line switch of conducting correspondence (and close all the other drive On line switch) come to carry out open test for each ink jet unit one by one.Owing to there is the ink jet unit of open circuit phenomenon can't controlled ink-jet, control unit 22 is carrying out open test of the present invention to each ink jet unit, and after learning that ink jet unit has the open circuit phenomenon, just can replace the ink jet unit of this open circuit with the contiguous normal ink jet unit of this ink jet unit.Because general printer all can drive printed medium (being file to be printed) and move with respect to each nozzle, to print complete printed medium one by one; In the process that moves, just can utilize the normal ink jet unit of vicinity of the ink jet unit of the opening a way ink jet unit inkjet printing that replaces opening a way, with remedy can't ink-jet the misprint that causes of open circuit ink jet unit.
Comprehensive, no matter the present invention is when carrying out short circuit or open test, it is high voltage that drive circuit 26B needn't drive each drive wire, also can not send the driving energy from drive wire.When carrying out short-circuit test, each address wire all is maintained at low level, and the switch on each drive wire is conducting current terminal that each drive wire is electrically connected with node N1 all; If arbitrary ink jet unit has short circuit phenomenon, then be connected in a Low ESR in the node N1 equivalence and the bigger electric current of conducting one; All do not have short circuit phenomenon as whole ink jet units, then be connected in a high impedance in the node N1 equivalence and the extremely low electric current of conducting.When carrying out open test, control unit is at each ink jet unit, with switch conduction (rest switch is closed) on the drive wire that address wire voltage raises (the remaining address line is kept low-voltage), this ink jet unit connects of this ink jet unit connection.If the ink jet unit in this test does not normally have open circuit, be connected in a Low ESR in the node N1 equivalence and the electric current of conducting certain degree; If the open circuit phenomenon takes place the ink jet unit in the test, be connected in a great impedance in the node N1 equivalence and the extremely low electric current of conducting.Measuring circuit just can be judged testing result according to the electric current of node N1, and produces corresponding detection signal 28S.
Please refer to Fig. 5 and Fig. 6.Fig. 5 and figure 6 Fen Do are the circuit diagram of the printer 30,40 of two embodiment in addition among the present invention.Play See for convenience of description, printer label components identical or function square among label and Fig. 2 in the printer 30,40, have identical functions and function mode, as control circuit 22, power circuit 24, address circuit 26A, drive circuit 26B, each ink jet unit, drive wire, address wire and switch S 1 to S3.The difference that printer 30,40 and printer 20 are main is that printer 30,40 Fen Do have used the testing circuit 38,48 of different designs.In the testing circuit 38 of Fig. 5, except switch S 1 to S3, also be provided with current providing circuit 40A and be used for producing the measuring circuit 40B of detection signal 38S.Be provided with resistance R 0, diode D0 and bipolar junction transistor (bipolar junction transistor) M3 among the current providing circuit 40A.The base stage of transistor M3 (base) is connected in the end (negative electrode) of diode D0; The other end of diode D0 (anode) is connected in node N1 then as the current terminal of current providing circuit 40A, also is connected in an end of resistance R 0 simultaneously; The other end of resistance R 0 then is connected in power Vcc.The emitter-base bandgap grading of transistor M3 (emitter) is held with being connected in, and collector electrode (collector) then is connected in measuring circuit 40B.Just cross as previously discussed, the current providing circuit among the present invention is to come supply of current according to the impedance magnitude of its current terminal, and measuring circuit just can be judged the result that open circuit or Duan Lu Measuring show according to size of current.When node N1 is connected in high impedance (just in the short-circuit test time during normal no short circuit phenomenon, or open circuit is arranged during phenomenon in the open test), the electric current that flows through resistance R 0 is few, making diode D0 anode is high voltage and conducting, make also conducting of transistor M3, produce the conducting electric current I 3 of certain degree.Relatively, if node N1 is connected in Low ESR and (just in the short-circuit test short circuit phenomenon is arranged, or in the open test normal and when not having the open circuit phenomenon), electric current reduces the voltage of diode D0 anode by R0, make the contrary conducting partially and not of diode D0, also not conducting and to make electric current I 3 essence be zero current of transistor M3.Measuring circuit 40B just can send corresponding detection signal 38S, the result of reaction detection according to the size of electric current I 3.
Be similar to the configuration among Fig. 5, in the testing circuit 48 among Fig. 6 except switch S 1 to S3, also be provided with current generating circuit 50A and measuring circuit 50B.Be provided with bipolar junction transistor M4 and resistance R 4 among the current generating circuit 50A.The base stage of transistor M4 is connected in node N1 as the electric current feed end of current providing circuit 50A; Emitter-base bandgap grading then is connected in resistance R 4, with the power Vcc bias voltage; Collector electrode then is connected in measuring circuit 50B.When current providing circuit 50A when the node N1 of current terminal is connected in high impedance, not conducting of transistor M4, electric current I 4 also essence is zero.When node N1 was connected in Low ESR, the base voltage of transistor M4 reduced, and made transistor M4 conducting and produced suitable electric current I 4.According to the size of electric current I 4, measuring circuit 50B just can produce corresponding detection signal 48S.As for printer among Fig. 5, Fig. 6 open a way, during short-circuit test, the operation of relative address line, drive wire and switch, all identical with printer 20 among Fig. 2 to Fig. 4, under the situation that does not hinder the technology of the present invention to disclose, repeat no more.
In existing printer detection method and circuit, only can carry out short-circuit test, can't contingent various open circuits of each ink jet unit of complete detection and short trouble.In comparison, the technology that the present invention discloses need not drive drive wire, just can effectively carry out short-circuit test, even short circuit phenomenon exists, can not damage important drive circuit, power circuit when testing yet, protection printer and user's handling safety.In addition, technology of the present invention also can further be carried out open test, can find out existing short-circuit test and can not find next open circuit damage ink jet unit.So, become big or diminish no matter be that the heating element resistance is unusual, and the switch in the ink jet unit damages unusually, the present invention can both be detected, and safeguards the safe in utilization of printer with further, and promotes print quality.
The above only is preferred embodiment of the present invention, and is all according to equalization variation and modification that the present invention did, all should belong to the covering scope of patent of the present invention.
Claims (13)
1. an ink jet unit that detects the ink discharge device method of short circuit whether, this ink discharge device includes:
One drive circuit is used to provide energy;
At least one ink jet unit, this ink jet unit are provided with nozzle, an input and a control end of a correspondence; When the control end of this ink jet unit received an ink-jet control signal, this ink jet unit can make this corresponding nozzle ink jet by the energy that this input receives this drive circuit and provides;
It is characterized in that this method includes:
Stop to send the control end that this ink-jet controls signal to this ink jet unit;
Stop to provide the input of energy to this ink jet unit with this drive circuit; And
Measure the electric current that this ink jet unit is received by this input,
Wherein, when measuring the electric current that this ink jet unit receives by this input,, judge that then this ink jet unit is short circuit if the electric current that this input receives differs from a preset value;
This ink discharge device comprises a current providing circuit in addition, and it has a current terminal; This current providing circuit can be according to the impedance of this current terminal and is supplied the electric current of a correspondence by this current terminal; In the time will measuring the electric current that this ink jet unit receives by this input, be that the input with this ink jet unit is connected to this current terminal.
2. method as claimed in claim 1, it includes in addition: if judge that this ink jet unit is short circuit, then stop to provide energy to this ink jet unit.
3. method as claimed in claim 1, wherein this ink discharge device includes a switch in addition, with be electrically connected between the input of the current terminal of this current providing circuit and this ink jet unit, but this switch conducting or close to control being electrically connected between this current terminal and this input, in the time the input of this ink jet unit will being connected to this current terminal, be to make this input be able to be electrically connected this switch conduction wherein with this current terminal.
4. method as claimed in claim 3, wherein when this ink jet unit received the energy that this drive circuit provides by this input, this switch was to cut out so that this current terminal is not electrically connected with this input.
5. method whether ink jet unit that detects an ink discharge device opens a way, this ink discharge device includes:
One drive circuit is used to provide energy;
At least one ink jet unit, this ink jet unit are provided with nozzle, an input and a control end of a correspondence; When the control end of this ink jet unit received an ink-jet control signal, this ink jet unit can make this corresponding nozzle ink jet by the energy that this input receives this drive circuit and provides;
It is characterized in that this method includes:
Send the control end that this ink-jet controls signal to this ink jet unit; And
Measure the electric current that this ink jet unit is received by this input,
Wherein, when measuring the electric current that this ink jet unit receives by this input,, judge that then this ink jet unit is open circuit if the electric current that this input receives differs from a preset value;
This ink discharge device comprises a current providing circuit in addition, and it has a current terminal; This current providing circuit can be according to the impedance of this current terminal and is supplied the electric current of a correspondence by this current terminal; In the time will measuring the electric current that this ink jet unit receives by this input, be that the input with this ink jet unit is connected to this current terminal.
6. method as claimed in claim 5, wherein this ink discharge device includes a plurality of ink jet units in addition; And this method includes in addition: if an ink jet unit is judged as open circuit, then replace the ink jet unit ink-jet of this open circuit with a compensation method of presetting with other ink jet unit.
7. method as claimed in claim 5, wherein this ink discharge device includes a switch in addition, with be electrically connected between the input of the current terminal of this current providing circuit and this ink jet unit, but this switch conducting or close to control being connected between this current terminal and this input, in the time the input of this ink jet unit will being connected to this current terminal, be to make this input be able to be electrically connected this switch conduction wherein with this current terminal.
8. method as claimed in claim 7, wherein when this ink jet unit received the energy that this drive circuit provides by this input, this switch was to cut out so that this current terminal is not electrically connected with this input.
9. method as claimed in claim 5 wherein is provided with a heating element in this ink jet unit, is connected in this input; When this heating element during by this input received energy, this heating element can be with the ink heating with by this corresponding nozzle ejection.
10. ink-jet recording apparatus, it includes:
One drive circuit is used to provide energy;
One address circuit is used to provide an ink-jet control signal;
At least one ink jet unit, this ink jet unit are provided with nozzle, an input and a control end of a correspondence; This control end is connected in this address circuit, and this input is connected in this drive circuit, and when the control end of this ink jet unit received this ink-jet control signal, this ink jet unit can make this corresponding nozzle ink jet by the energy that this input receives this drive circuit and provides;
One current providing circuit, it has a current terminal, and this current providing circuit can provide the electric current of a correspondence according to the impedance of this current terminal,
It is characterized in that described black tape deck also includes:
One switch is connected between the input and this current providing circuit of this ink jet unit, is used for controlling being electrically connected between this input and this current terminal; When this switch conduction, this input can be electrically connected with this current terminal, and when this switch cut out, this input can no longer be electrically connected with this current terminal; And
One measuring circuit is used for producing according to the electric current that this current providing circuit provides in this current terminal the detection signal of a correspondence,
When wherein being electrically connected with this current providing circuit when this switch conduction and with this ink jet unit, this drive circuit can stop to provide energy to this ink jet unit;
When wherein being electrically connected with this current providing circuit when this switch conduction and with this ink jet unit, this drive circuit can stop to provide energy to this ink jet unit, and this testing circuit can be when this address circuit also stops to provide this ink-jet control signal, and the electric current that provides in this current terminal according to this current providing circuit produces the short-circuit detection signal of a correspondence.
11. as the ink-jet recording apparatus of claim 10, wherein when this drive circuit provided energy to this ink jet unit, this switch can cut out the current terminal that makes this current providing circuit and no longer be electrically connected with the input of this ink jet unit.
12. an ink-jet recording apparatus, it includes:
One drive circuit is used to provide energy;
One address circuit is used to provide an ink-jet control signal;
At least one ink jet unit, this ink jet unit are provided with nozzle, an input and a control end of a correspondence; This control end is connected in this address circuit, and this input is connected in this drive circuit, and when the control end of this ink jet unit received this ink-jet control signal, this ink jet unit can make this corresponding nozzle ink jet by the energy that this input receives this drive circuit and provides;
One current providing circuit, it has a current terminal, and this current providing circuit can provide the electric current of a correspondence according to the impedance of this current terminal,
It is characterized in that described black tape deck also includes:
One switch is connected between the input and this current providing circuit of this ink jet unit, is used for controlling being electrically connected between this input and this current terminal; When this switch conduction, this input can be electrically connected with this current terminal, and when this switch cut out, this input can no longer be electrically connected with this current terminal; And
One measuring circuit is used for producing according to the electric current that this current providing circuit provides in this current terminal the detection signal of a correspondence,
Wherein, when being electrically connected with this current providing circuit when this switch conduction and with this ink jet unit, this drive circuit can stop to provide energy to this ink jet unit;
When being electrically connected with this current providing circuit when this switch conduction and with this ink jet unit, this drive circuit can stop to provide energy to this driver element, and this testing circuit can be when this address circuit provides this ink-jet control signal, and the electric current that provides in this current terminal according to this current providing circuit produces the open circuit detection signal of a correspondence.
13. as the ink-jet recording apparatus of claim 12, wherein be provided with a heating element in this ink jet unit, be connected in this input; When this heating element during by this input received energy, this heating element can be with the ink heating with the nozzle ejection by correspondence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02123265 CN1219642C (en) | 2002-06-17 | 2002-06-17 | Ink-jet printer ink-ejecting unit open circuit and short circuit testing process and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02123265 CN1219642C (en) | 2002-06-17 | 2002-06-17 | Ink-jet printer ink-ejecting unit open circuit and short circuit testing process and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1463848A CN1463848A (en) | 2003-12-31 |
| CN1219642C true CN1219642C (en) | 2005-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02123265 Expired - Fee Related CN1219642C (en) | 2002-06-17 | 2002-06-17 | Ink-jet printer ink-ejecting unit open circuit and short circuit testing process and apparatus |
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| CN (1) | CN1219642C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5638518B2 (en) | 2008-05-21 | 2014-12-10 | 富士フイルム株式会社 | Overcurrent detection of droplet discharge device |
| CN102377161B (en) * | 2010-08-18 | 2014-10-29 | 北京美科艺数码科技发展有限公司 | Piezoelectric nozzle protection circuit |
| CN111469560B (en) * | 2018-09-20 | 2021-07-13 | 杭州旗捷科技有限公司 | Regeneration ink box |
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2002
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