CN100572071C - Phase place is adjusted used threshold value automatic regulating system and method - Google Patents

Phase place is adjusted used threshold value automatic regulating system and method Download PDF

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Publication number
CN100572071C
CN100572071C CNB2005800277600A CN200580027760A CN100572071C CN 100572071 C CN100572071 C CN 100572071C CN B2005800277600 A CNB2005800277600 A CN B2005800277600A CN 200580027760 A CN200580027760 A CN 200580027760A CN 100572071 C CN100572071 C CN 100572071C
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China
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threshold value
ink droplet
signal
charge
value
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CNB2005800277600A
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Chinese (zh)
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CN101031425A (en
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M·J·赖比基
A·E·费克林
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录象射流技术公司
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Priority to US10/949,605 priority
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Publication of CN101031425A publication Critical patent/CN101031425A/en
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Abstract

Some embodiment provides a kind of use continous inkjet printers to carry out the self-regulating system and method for threshold value.A kind of embodiment of system comprise be used for from China ink stream produce the nozzle (6) of ink droplet, with respect to the nozzle location and be used for measuring drop charges with the sensor that produces charge signal, be used to detect charge signal peak value peak detector (60) and be used for regulating the threshold value memory device of threshold value according to the amount of the peak value that is detected.In one embodiment, threshold value memory device, stores threshold value.For example, the threshold value memory device can be a digital potentiometer.This system can also comprise the comparator that is used for comparison charge signal and threshold value.Comparator can make a choice between threshold value and canonical reference signal, to compare with charge signal.

Description

Phase place is adjusted used threshold value automatic regulating system and method

Technical field

The present invention relates to inkjet printing, especially in ink-jet printer, carry out phase place adjust used improvement threshold value automatic regulating system and method.

Background technology

Continous inkjet printers is well-known at industry coding and marker field, is widely used on the production line in the information by printing Expiration Date and so on the various base materials of printer.As shown in Figure 1, the piezoelectric element that vibrated of one China ink resolves into the even ink droplet of a string rule.Ink droplet is by charging panel then, and this charging panel is each ink droplet charging under selected voltage.Ink droplet is provided as the transverse electric field that crosses a pair of deflecting plates by one then.Each ink droplet is deflected certain amount, and amount of deflection depends on its electric charge.If ink droplet is not recharged, it can pass through deflecting plates, but not deflection.The ink droplet of uncharged and slight charging is collected in the gatherer, and turns back to Mo Yuan with recycling.The ink droplet that advances along the track of avoiding gatherer can impinge upon base material certain a bit on, this is determined by the electric charge on the ink droplet.Usually, each charged ink droplet is furnished with a uncharged basically protection ink droplet, thereby reduces electrostatic interaction and pneumatic interaction between the charged droplets.Because base material moves through printer, the ink droplet on the base material has a component by decision release time of ink droplet in the position of base material moving direction.Below, the moving direction of base material is called horizontal direction, will on substrate plane, the direction vertical be called vertical direction with horizontal direction.These directions and base material and the printer orientation in the space is irrelevant.If ink droplet is by vertical deflection, the position of ink droplet on vertical direction and horizontal direction will be by the determining positions of electric charge on the ink droplet and base material.

In general custom, predetermined grating pattern is provided and, represents the character of a preliminary dimension usually for the matrix of each pattern.For example, as shown in Figure 2, can generate one high * wide be the matrix of 5 * 5 representative image, it represents a complete image, as character, or the part of an image.Fig. 3 has showed one 7 * 9 matrix, and this generates character more clearly.The technology that is widely used in printing these characters or image section discloses in U.S. Patent No. 3298030 (Lewis etc.).Stroke is defined as each row of matrix, the part of representative image.Each useful ink droplet is assigned to each pixel (some position) in the stroke.If pixel is a blank pixel, ink droplet does not charge so, collects but be collected device, and is sent back to Mo Yuan.If pixel will be printed, so suitable electric charge just is added on the ink droplet, so ink droplet is deflected along advancing at the track that the correct position place in should the row of stroke and base material are intersected.All strokes in character repeat this circulation, and character late restarts then.If the ink droplet lateral deflection is to the traffic direction of base material, a branch of ink droplet that forms a stroke can clearly be distributed on the diagonal, because base material can move certain distance between per two ink droplets in this stroke.Along with the increase of base material speed with respect to ink ejection velocity, the angular displacement meeting of this line and vertical direction increases.This angular displacement can make it offset from perpendicular and partial offset by the angle of adjusting deflecting plates, and the counteracting amount depends on the goal pace of base material.If the position that the ink droplet in stroke is not equated to the base material at interval by continuous dispensing, these points just no longer distribute point-blank so.

In order to keep simple matrix raster pattern---wherein the straight line on any direction all is mapped on the straight line on the base material in the matrix, must be in a stroke printed dot continuously, and the time interval between per two strokes equate.No matter a stroke comprises a printed dot still is five printed dot, and its institute's time spent all equates.In general, the extra protection ink droplet that uses number not to wait at the end of each stroke, thus make base material speed connect a ground variation based on one.

Existing systems can be by measuring the peak value of the charge signal that obtains from China ink stream, charging produces feedback to ink droplet.System usually uses a threshold value of comparing with charge signal.In existing system, threshold value physically is arranged on some trip point place, and on any this trip point all is " good " phase place.Be used for being placed in black gatherer, and usually obtain data by physically regulating from the sensor of China ink stream acquisition charge signal data.Concerning printer user, this method inconvenience, time-consuming and not too accurate.For different China inks, printer and environment, system configuration and threshold value must manually change.In addition, sensor is positioned in the black gatherer and can brings extra interference to charge measurement because of gatherer with the distance of the nozzle that produces China ink stream.In addition, be difficult to separate single ink droplet in the black gatherer.Like this, in ink-jet print system, just need a kind of improved system and method to measure electric charge and threshold value is set.

In ink-jet printer, also need a kind of phase place adjust used improvement threshold value automatic regulating system and method.

Summary of the invention

Some embodiment provides a kind of use continous inkjet printers to carry out the self-regulating system and method for threshold value.A kind of embodiment of system comprise be used for from China ink stream produce the nozzle of ink droplet, with respect to the nozzle location and be used for measuring drop charges with the sensor that produces charge signal, be used to detect charge signal peak value peak detector and be used for regulating the threshold value memory device of threshold value according to the many peak values that detected.

In one embodiment, threshold value memory device, stores threshold value.For example, the threshold value memory device can be a digital potentiometer.This system can also comprise the comparator that is used for comparison charge signal and threshold value.Comparator can be selected between threshold value and canonical reference signal, to compare with charge signal.Selector can be used for selecting between threshold value and canonical reference signal.This system can also comprise the electronic filter that is used to filter charge signal.Can also locate one second sensor with respect to black gatherer, be used for measuring electric charge, to produce second charge signal from ink droplet.

An embodiment of adaptivity threshold value control method comprises: detect the electric charge at least one ink droplet, according to the charge generation charge signal; Then according to charge signal conditioning signal threshold value.This method can also comprise the peak value of measuring in the charge signal.Can select an electric charge phase place to print according to signal threshold value.Signal threshold value can be stored.In one embodiment, this method comprises comparison signal threshold value and charge signal.This method can be included between signal threshold value and the reference threshold and select, to compare with charge signal.

This method can also comprise according to the electric charge at least one ink droplet, produces second charge signal.In addition, this method can comprise according to charge signal, measures the running time of at least one ink droplet.This method can also comprise to be determined to drive the point that produces peak swing in charge signal with minimum nozzle.

An embodiment adjusting the system that carries out the dynamic threshold adjusting in the feedback unit in phase place comprises: the sensor that is used to measure the electric charge on the ink droplet, be used for according to the detecting unit of electric charge dynamic adjustments signal compare threshold and be used for comparison electric charge phase signal and the comparator of signal compare threshold.This system can comprise a plurality of sensors, is used for obtaining in a plurality of positions the charge data of ink droplet.In one embodiment, phase place of detecting unit selection is the ink droplet charging.

Description of drawings

Fig. 1 has showed the operation of typical continous inkjet printers.

Fig. 2 has showed the character of 5 * 5 exemplary font that continous inkjet printers is used.

Fig. 3 has showed the character of 7 * 9 standard letters that known continous inkjet printers is used.

Fig. 4 has showed the method for printing two row traces according to particular embodiment of the present invention.

Fig. 5 has showed the data window that can be used in the particular embodiment of the present invention.

Fig. 6 has described the phase-adjusting system used according to embodiment of the present invention.

Fig. 7 has showed a phase-adjusting system, and it has according to the used adaptive threshold of embodiment of the present invention regulates.

Fig. 8 has showed the method flow diagram of regulating corresponding to according to the used self adaptation phase threshold of embodiment of the present invention.

When the reference accompanying drawing is read, will be better appreciated by above-mentioned brief summary of the invention and below to the detailed description of the preferred embodiment for the present invention.In order to illustrate preferred implementation of the present invention, showed in the accompanying drawings at present preferred embodiment.Yet be appreciated that the present invention is not limited to structure shown in the accompanying drawing and means.

The specific embodiment

According to embodiment shown in Figure 1, continous inkjet printers 1 comprises the printhead with ink-droplet generator 4, and ink-droplet generator 4 is accepted China ink from black source 40.Ink-droplet generator combines with piezoelectric oscillator, and piezoelectric oscillator produces disturbance at the Mo Liuzhong at nozzle 6 places.Therefore, from nozzle, correspondingly penetrate the ink droplet of size and interval rule.Ink droplet is by charge tunnel 10, and here, different electric charges can be applied on each ink droplet.When ink droplet during by a pair of deflecting plates 20, electric charge has determined amount of deflection, and this is to keeping substantially invariable electric field between the deflecting plates.Ink droplet 22 uncharged or slight charging does not add deflection substantially and arrives gatherer 30, and is circulated back to Mo Yuan 40.The ink droplet 24 of charging and is deflected by directive base material 50, thereby has the track that impacts this base material, and wherein, the matrix along continuous straight runs passes through printhead.Be applied to charge level control inking on the ink droplet and drop in vertical displacement/position on the base material.

The electric charge that will be applied on the ink droplet is determined by controller 60, controller 60 can be by realizing that such as general processor, microprocessor, microcontroller or equipment with embedded controller of suitable input and output circuit these equipment are well known in the art.Operation under the general program control of the instruction of controller 60 in being stored in relational storage.Memory generally comprises a part of permanent memory (for example flash memory, harddisk memory, EEPROM etc.) and volatile memory (for example RAM).Controller 60 transmits control signal for charge tunnel 10 according to program, and when passing through charge tunnel 10 with convenient ink droplet, control is applied to the electric charge on each ink droplet.A kind of suitable microprocessor is the DS 80C310 type microprocessor that is provided by the Texan dallas semiconductor in Dallas company; Yet other many commercially available equipment also are fit to the function of implementation controller 60.

With reference to Figure 4 and 5, ink droplet is according to being recharged and printing based on the method for stroke, and wherein each stroke or row are divided into N virtual print position, in this N position, only allows the individual described position of n to be used as actual print position in these row, wherein N>n.As shown in Figure 4, when a stroke comprised the multirow trace, every capable marking was divided into N virtual print position, in this N position, only allowed the individual virtual print position of n to be used as actual print position in this print line, wherein N>n.In particular embodiment shown in Figure 4, the two row markings are arranged, every capable trace has 9 virtual print positions (N=9), in these 9 positions, only allows 5 (n=5) positions to be used as actual print position in given any stroke.

At least some are divided into paired adjacent print positions in N the virtual print position, and wherein, every pair of adjacent position comprises first (for example, down) print position and second (for example) print position.In the application of single file trace, every pair is had only a print position usually, that is, go up or following print position, is used in given any stroke, so that reduce the influence of the electrostatic interaction between the printed dot.When a stroke comprises the multirow trace, by along alternately upwards inclined-plane printed dot, ink droplet can be printed on two right positions of the adjacent print positions of being given, print the electrostatic interaction effect that has reduced between the ink droplet along alternately upwards inclined-plane.

In the embodiment of Fig. 4, every capable marking has the individual virtual print position of odd number (N=9).8 groups of phase adjacency pairs (being numbered 1s-8s) and two not paired print positions (being numbered 9s and 10s) like this, are in fact arranged.In embodiment as shown in the figure, the print position of the top is not paired in every row; Yet, be understood that this arrangement only illustrates, and nonrestrictive embodiment.

Accompanying drawing border note 1s-10s is used for representing the page order of a stroke.In the following description, these positions are called as the stroke position, for example, and " first stroke position 1s ".As shown in Figure 4, ink droplet can (specifically, 1s-10s) be printed, wherein by alternately upwards inclined-plane order, the alternately print line of ink droplet in the given stroke from this stroke begins to print, and the extreme lower position (being charge potential) in each print line is printed to the extreme higher position.Print the vertical range on base material between the adjacent drops that has increased in the black stream by alternately upwards inclined-plane in proper order, thereby electrostatic interaction is reduced greatly.

As mentioned above, charge tunnel 10 is to be the device of ink droplet charging during by path 10 when ink droplet.In the time of will charging, the black flow point in ink droplet and the charge tunnel 10 is opened.Printed dot voltage is applied on the charge tunnel 10, thereby is the ink droplet charging.For example, on the trailing edge of software selectable phase clock, printed dot voltage can be applied on the charge tunnel 10.

The phase place adjustment is the Best Times determining electric charge is outputed to charge tunnel 10 to allow that maximum charge is added in method on the ink droplet.There is several method to can be used for determining Best Times, for example, moving window formula phase system.Phase-adjusting system is at different phase place output phase ink droplet constantly, and when ink droplet arrives black gatherer 30, determines the electric charge on the phase place ink droplet (that is the ink droplet that is recharged) under phase voltage.For example, phase place can be adjusted reading amplification detection device is placed in the gatherer 30 with the electric charge on definite not printed dot.According at the detected signal in gatherer 30 places, which phase place printing phase-adjusting system is determined with, and whether definite printer is charging to ink droplet required level.

Fig. 6 has described the phase-adjusting system 600 used according to embodiment of the present invention.Phase-adjusting system 600 comprises detection amplifying circuit 610, nozzle drive circuit 620 and phase place ink droplet charging circuit 630.

For example, detecting amplifying circuit 610 can be with respect to black gatherer 30 and/or nozzle 6 location.Detection amplifying circuit 610 use casacade multi-amplifiers detect the electric charge on the ink droplet.Circuit 610 accumulative totals go out the electric charge of ink droplet jet, and generate output signal.Output signal compares with reference value then.If signal value greater than reference value, is just exported low (for example, 0 volt) signal; If signal value less than fixed value, is just exported high (for example, 5 volts) signal.Can control the fiducial value (for example, being set to 0.5 volt) of this signal by adjustable potentiometer.

Nozzle drive circuit 620 is being controlled the ink droplet that disconnects with China ink stream.Ink droplet disconnects with vibration of ink droplet clock frequency and China ink stream because of piezo-electric crystal or separates.Sine voltage is applied on the piezo-electric crystal to produce vibration.Sine wave usually is called as nozzle and drives, and makes it and ink droplet clock synchronous.Nozzle drive circuit 620 is being controlled sinusoidal wave amplitude.By changing sinusoidal wave amplitude, can change the open position of ink droplet.

For example, can come control phase ink droplet charging circuit 630 by startup/disable bit.When being activated, phase place ink droplet charging circuit 630 is worked as follows: phase place ink droplet charging circuit is applied to phase voltage on the charge tunnel 10, and selected phase clock is in " height " position simultaneously.Phase place ink droplet charging circuit removes the phase voltage on the charge tunnel 10, and phase clock is in " low " position simultaneously.The phase voltage that is applied on the ink droplet can be fixed by hardware and/or software.In one embodiment, phase place ink droplet charging circuit 630 can be selected between 4 phase clocks.In another embodiment, phase place ink droplet charging circuit 630 can be selected between 16 phase clocks.

When ink droplet passed through charge tunnel 10, phase-adjusting system can be to the ink droplet timing of charging.Phase-adjusting system is regulated charge signal with clocking information, is added in electric charge on the ink droplet with optimization.In the past, threshold value was to be set to predeterminated level in hardware, to determine having received how many " good " signals in the given period.Some embodiment of the present invention provides the digital control automatically of threshold value, to determine to have detected how many " good " phase places.

Fig. 7 has showed a phase-adjusting system 700, and it has according to the used adaptive threshold of an embodiment of the invention regulates.Phase-adjusting system 700 comprises nozzle 710, leaps sensor 720, electronic filter 730, peak filter 740, digital potentiometer 750, selector 760, comparator 770 and export 780.China ink arrives the charge tunnel (not shown) by nozzle 710.Nozzle 710 produces ink droplet, and the latter is charged to certain level to print.The ink droplet of charging is by leaping sensor 720 to measure.

Phase-adjusting system 700 can be checked each ink droplet or ink droplet bundle, and this depends on the software configuration.With to obtain data from the sensor that is arranged in black gatherer (not shown) different, phase-adjusting system 700 comprises with respect to the sensor 720 of nozzle 710 location (for example, be called leap sensor).During electric charge on detecting ink droplet, it is shorter than gatherer sensor to leap the required time interval of sensor 720, and this is because charging ink droplet runs to the distance shortening of ink droplet by sensor 720 from nozzle 710.In addition, in gatherer, be difficult to discern single ink droplet, but a line of ink marker.Leap the electric charge on the single ink droplet of sensor 720 permission measurements.

In one embodiment, leaping sensor 720 is capacitance sensors.For example, sensor 720 can be a capacitance sensor, and it comprises the metal-coating of outer lining of plastics and brass tube one class, and the latter links to each other with the cable of coaxial cable one class.For example, the metal of sensor 720 part is by epoxy coating and ink droplet insulation.Coating on the metal sensor can prevent that ink droplet from making sensor 720 short circuits.Cable allows to transmit data to handle from sensor 720.Can use various cables, such as teflon coaxial cable, low noise coaxial cable or other cables.In one embodiment, sensor 720 can be integrated with printhead or other system element, to reduce or the cancellation cable.Electrostatic capacitor coupling between sensor 720 and ink droplet and metallic plate or the pipe.Spread out of charge information from sensor 720 then, to handle by electronic filter 730, peak detector 740 and/or other system element.

In another embodiment, in black gatherer, place an aiding sensors.Can obtain two groups of electric charge parameters with the combination of these two sensors.Also can measure ink droplet in the running time that leaps between sensor 720 and the black gatherer sensor with these two sensors.In addition, can fix two at the diverse location that begins from nozzle and leap sensor, cross over the time of this distance to measure ink droplet.

The signal that electronic filter 730 is handled from sensor 720 is so that more effectively use and analytic signal.For example, electronic filter 730 filters, level and smooth and/or amplify from the signal that leaps sensor 720, thereby improves signal quality and availability for peak detector 740.

Peak detector 740 is analyzed from the signal that leaps sensor 720, to determine the peak value of signal.In one embodiment, after signal is filtered by electronic filter 730, peak detector 740 analytic signals.In one embodiment, peak detector 740 can be integrated with other elements of electronic filter 730 and/or system 700.Peak detector 740 correction signals (that is, separation signals on the occasion of part).Detector 740 is the peak value of detection signal in part then, and this signal indication is by the electric charge on the ink droplet that leaps sensor 720.

The peak information of signal is used to set a threshold value, to separate the charging ink droplet of " good ".This threshold value is used to help system identification and quantizes a large amount of good ink droplets, thereby provides feedback for charging.Can come the processing signals peak information with software and/or hardware, and setting threshold.Threshold value is regulated according to signal peak information.For example, if the peak value that records greater than threshold value is less than some, then reduce threshold value.If record peak value greater than threshold value more than some, just improve threshold value.For example, threshold value can be regulated by the user and/or by software.Regulate threshold value and provide feedback for print system.Threshold value has been set the sensitivity of print system.The adjusting threshold value can obtain the phase-group of best (for example, the strongest).Then, print system can be selected to print with in these phase places which.

Threshold information is stored in the memory device of digital potentiometer 750 and so on.That is to say that potentiometer 750 is adjusted to the current threshold signal level of reflection.Potentiometer 750 can be regulated by the user and/or by software.

Selector 760 permission systems (for example, by being selected by user, software and/or hardware) make a choice between threshold value of regulating and predetermined reference value.The predetermined reference value can be to be realized by hardware, or is selected by software, or is manually selected by the user.For example, the predetermined reference value can be stored in potentiometer or the memory.Like this, selector 760 just allows to select reference threshold or select the threshold value of dynamic adjustments and the electric charge phase signal of arrival to compare.For example, selector 760 can be that adjustable jumper, multiplexer or other hardware or software are selected equipment.

Comparator 770 is 720 and corresponding with the charging ink droplet signal of autobiography sensor and regulate threshold value or reference threshold compares in the future.As mentioned above, the value of comparing with charge signal is provided with by selector 760.If signal peak less than selected threshold value, is then abandoned signal peak.If signal peak greater than selected threshold value, so just can determine which phase place ink droplet should be recharged and print in signal peak.As mentioned above, in order to regulate the adaptivity threshold value, can keep many countings that are higher or lower than the peak value of threshold value.The signal value that is higher than threshold value can be transmitted, and is used for handling and/or by follower 780 system feedback.For example, signal value can be used for determining when maximum charge can be applied on the ink droplet.For example, signal value can be as feedback, with fine setting ink droplet charge volume and release opportunity.

Fig. 8 has showed the flow chart according to the used self adaptation phase threshold control method 800 of an embodiment of the invention.At first, in step 810, the electric charge on the sensor measurement ink droplet.Then, in step 820, detect the positive peak in the signal of representing drop charges.In step 830, regulate threshold value according to the number of detected positive peak or phase place.For example, if record the phase place that is higher than current threshold value or peak value, then reduce threshold value (for example, by a potentiometric counting) less than 7.For example, if record the phase place that is higher than current threshold value or peak value, then improve threshold value greater than 9.

Next, in step 840, the threshold value of charge signal and adjusting or the reference threshold of storage compare.Then, in step 850, comparative result is transported to software and/or hardware in the print system.For example, this output can be used as feedback, with the number of regulating used phase place, be applied to the quantity of electric charge on the ink droplet, threshold value or other parameters of phase-detection.

In one embodiment, phase meter that comprises a plurality of printing phase places of compiling.Required phase place can be selected and use to systems soft ware from this table.Can add auxiliary phase in this table in the past, and/or print with it.In another embodiment, added auxiliary potentiometer in the phase-adjusting system with the storage supplemental threshold, to change comparison level in the past.

In an alternate embodiment, the adaptivity threshold value is regulated a plurality of China inks that can be applied in the print system and is sprayed.For example, a black gatherer can be used for a plurality of China ink injections.Can place a plurality of sensors to obtain the data of multiply China ink stream.Multiplexer can be used for selected data-signal is sent to processing logic.In addition, can detect and processing logic for each data-signal provides independent peak value.

In one embodiment, phase-adjusting system and charge detection circuit can be used for detecting attached ink droplet (satellites) or the cracked ink droplet that separates with ink droplet.Detected electric charge can be used for determining whether attached ink droplet merges with original ink droplet from the China ink by sensor.For example, spike can detect, and here, attached ink droplet merges once more with ink droplet.Maximum nozzle actuating speed when can be used for determining to print from the information that merges once more of charge signal.When the nozzle actuating speed increased, the ink droplet breakaway poing also changed, and was desirably under the different phase places and prints.Use can be regulated nozzle actuating speed and phase place from the signal data of phase-adjusting system, to determine driving the point that produces peak swing with minimum nozzle.

Like this, some embodiment of the present invention provides a kind of user intervention and the minimum flexible system of configuration.For example, some embodiment is allowed the black model of change, black quality, machine parameter and ambient parameter.Some embodiment provides a kind of efficient, cheap system and method, is used to improve the calibration of various printers, does not make or operational tolerance but do not increase.Some embodiment provides feedback, with dynamic adjustments charge threshold, phase place, opportunity and other system parameter, thereby optimizes printing.Some embodiment has reduced user's setting, and automatically adjusts for different conditions.For example, the continuous adaptive temperature of some embodiment, environment, black quality and black model are operated in print window again simultaneously.Some embodiment of the present invention is used in any system that applies electric charge on the ink droplet.

Although be with reference to preferred implementation the present invention to be illustrated, those skilled in the art only are appreciated that otherwise deviate from invention scope that the present invention can make various changes, and can replace with the embodiment of equivalence.In addition, only otherwise deviate from invention scope,, can do many improvement, to adapt to special situation or material at the instruction of invention.Therefore, do not plan to limit the invention to disclosed particular embodiment, opposite the present invention plans to comprise all embodiments in the scope that drops on appending claims.

Claims (5)

1. system (700) that in ink-jet print system, regulates threshold value, the electric charge of ink droplet and this threshold value compare, describedly be used for relatively determining that described ink-jet print system applies the Best Times of electric charge to ink droplet, make and on ink droplet, apply maximum charge, described system (700) comprising: nozzle (710) is used to produce the jet of ink droplet; Leap sensor (720), be used to detect the electric charge of described ink droplet and the charge signal of representing described drop charges is provided; Peak detector (740) is used to analyze described charge signal to determine peak value wherein, and each peak value is corresponding to the ink droplet that charges respectively; With threshold value memory device (750), be used for storing the described threshold value of regulating according to the described peak value that appears at described charge signal, if the peak value that is higher than existing threshold value less than predetermined quantity is arranged in described charge signal, the threshold value of described adjusting becomes and is lower than current threshold value, if the peak value greater than existing threshold value of being higher than of predetermined quantity is arranged in described charge signal, the threshold value of described adjusting becomes and is higher than current threshold value;
This system also comprises comparator (770), is used for the threshold value or the predetermined reference value of more described charge signal and described adjusting.
2. the system as claimed in claim 1 is characterized in that, described threshold value memory device (750) comprises digital potentiometer (750).
3. the system as claimed in claim 1 is characterized in that, also comprises being used for the selector (760) selected between the threshold value of described adjusting and described predetermined reference value.
4. the system as claimed in claim 1 is characterized in that, also comprises electronic filter (730), is used for filtering described charge signal before described peak detector (740) is analyzed described charge signal.
5. the system as claimed in claim 1, it is characterized in that, also comprise second sensor, be used for detecting the electric charge on the ink droplet that produces by nozzle (710), described second sensor is positioned in the black gatherer (30) of ink-jet print system, and described second sensor provides second charge signal.
CNB2005800277600A 2004-06-17 2005-06-15 Phase place is adjusted used threshold value automatic regulating system and method CN100572071C (en)

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GB0719992D0 (en) * 2007-10-12 2007-11-21 Videojet Technologies Inc Ink jet printer head assembly
FR2971451B1 (en) 2011-02-11 2013-03-15 Markem Imaje STIMULATION RANGE DETECTION IN A CONTINUOUS INK JET PRINTER
US9770906B2 (en) * 2014-06-05 2017-09-26 Videojet Technologies Inc. Ink buildup sensor arrangement
CN107685539B (en) 2017-09-22 2019-04-23 京东方科技集团股份有限公司 Ink jet printing head, ink-jet system for measuring quantity and method and ink-jet amount control method

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