CN110525048A - A kind of device, system and method measuring droplet volume - Google Patents
A kind of device, system and method measuring droplet volume Download PDFInfo
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- CN110525048A CN110525048A CN201910813624.8A CN201910813624A CN110525048A CN 110525048 A CN110525048 A CN 110525048A CN 201910813624 A CN201910813624 A CN 201910813624A CN 110525048 A CN110525048 A CN 110525048A
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- electric field
- ink droplet
- distance
- droplet
- charge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/0456—Control methods or devices therefor, e.g. driver circuits, control circuits detecting drop size, volume or weight
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
The invention discloses a kind of device, system and methods for measuring droplet volume, are related to field of display technology and have achieved the purpose that improve the precision for calculating droplet volume.Main technical schemes of the invention are as follows: include: charging chamber, charging chamber with nozzle for being oppositely arranged, so that the ink droplet that nozzle sprays enters in charging chamber, and for making ink droplet have default charge；Electric field chamber, electric field chamber are connected with charging chamber, and electric field is intracavitary to be formed with deflecting electric field, for deflecting ink droplet；Acquisition component, it is intracavitary that acquisition component is set to electric field, acquisition component is used to obtain the first distance that edge of the ink droplet in deflecting electric field is moved perpendicular to electric field line, the second distance moved in the electric field along electric field line: processing circuit, processing circuit is connected with acquisition component, and processing circuit is used to calculate droplet volume according to the electric field strength of the first distance of ink droplet, second distance, the quantity of electric charge of default charge and deflecting electric field.Present invention is mainly used for measurement droplet volumes.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of device, system and methods for measuring droplet volume.
Background technique
Organic electroluminescent (Organic light-emitting diodes, OLED) display panel is that a kind of utilization has
The molding display device of machine material package, fast response time low with operating voltage, luminous efficiency are high, visual angle is wide and work
The advantages that temperature is wide, conducive to the lightening of display device, low-power consumption and curved design.Organic electroluminescence device (OLED) is opposite
Have many advantages, such as that self-luminous, reaction is fast, visual angle is wide, brightness is high, color is gorgeous, frivolous in LCD, it is considered to be next generation's display skill
Art.
The thin film-forming method of OLED mainly has vapor deposition processing procedure and solution process.Processing procedure is deposited in small size using more mature,
The technology has been applied in volume production at present.And solution process OLED thin film-forming method mainly has inkjet printing, nozzle application, rotation
Painting, silk-screen printing etc., wherein inkjet printing technology is since its stock utilization is higher, it is in large size to may be implemented, it is considered to be
The important way of large scale OLED realization volume production.
Show that product has many advantages, such as that stock utilization is high using inkjet printing methods production OLED, it is short to be made the time, institute
To be paid attention to by more and more producers using the method for inkjet printing production OLED product.
The inkjet printing of product, which requires to be accurate to each pixel, to be shown to OLED, so to printing in ink jet printing process
The required precision of ink droplet is relatively high.Meanwhile in order to control the accurate of printing film thickness, for squeezing into the quantity of ink of each pixel,
It needs to be precisely controlled.This just needs to be precisely controlled the volume that each nozzle sprays ink droplet, generally require the volume difference of ink droplet ±
0.5% or less < just can ensure that device is lighted and not show mura.But for this one small ink droplet, the accurate body for measuring ink droplet
Product be it is highly difficult, can directly be taken pictures in the prior art to ink droplet by CCD (charge coupling device imaging sensor),
The volume of ink droplet is then calculated by photo, but this method computational accuracy is lower, therefore how to improve calculating droplet volume
Precision the technical issues of being those skilled in the art's urgent need to resolve.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of device, system and method for measuring droplet volume, main purpose is
Improve the precision for calculating droplet volume.
On the one hand, the embodiment of the invention provides a kind of device for measuring droplet volume, which includes:
Charge chamber, and the charging chamber with nozzle for being oppositely arranged, so that the ink droplet that nozzle sprays enters the charging chamber
In, and for making ink droplet have default charge；
Electric field chamber, the electric field chamber are connected with the charging chamber, and the electric field is intracavitary to be formed with deflecting electric field, for making
Ink droplet deflection；
Acquisition component, it is intracavitary that the acquisition component is set to the electric field, and the acquisition component is for obtaining ink droplet inclined
Turn the first distance that the edge in electric field is moved perpendicular to electric field line, the second distance moved in the electric field along electric field line:
Processing circuit, the processing circuit are connected with the acquisition component, and the processing circuit is used for according to ink droplet
The electric field strength calculating droplet volume of first distance, second distance, the quantity of electric charge of default charge and deflecting electric field.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
Specifically, further includes: control unit, the control unit with the charging chamber for being connected, the control unit
Part is used to apply predeterminated voltage to the charging chamber every first time period, applies predeterminated voltage to the charging chamber and continues second
Period.
Specifically, the charging chamber includes two substrates being oppositely arranged, and the same electricity of two substrates and control unit
Pole is connected.
Specifically, the electric field chamber includes first voltage plate and second voltage plate, and the first voltage plate is used for and power supply
Anode be connected, the second voltage plate with the cathode of power supply for being connected, the first voltage plate and second electricity
Deflecting electric field is formed between pressing plate, the acquisition component is set to outside the deflecting electric field.
Specifically, the direction of the electric field line of the deflecting electric field is parallel with gravity direction.
On the other hand, the embodiment of the present invention also provide it is a kind of measure droplet volume system, the system include: print cartridge and with
The device of measurement droplet volume, the print cartridge provided by upper any embodiment are connected with spray head, are provided on the spray head more
A nozzle, the nozzle correspond to the charging chamber setting of the measurement droplet volume device, the print cartridge ground connection.
On the other hand, the embodiment of the present invention also provides a kind of method for measuring droplet volume, this method comprises:
Ink droplet is set to have default charge；
The ink droplet with default charge is set to enter deflecting electric field, ink droplet motion profile deflects；
According to ink droplet being transported along the first distance moved perpendicular to electric field line, in the electric field along electric field line in deflecting electric field
Dynamic second distance, the quantity of electric charge of default charge and the electric field strength of deflecting electric field calculates droplet volume.The purpose of the present invention
And it solves its technical problem also following technical measures can be used to further realize.
It is specifically, described that the ink droplet with default charge is made to enter deflecting electric field specifically:
The ink droplet with default charge is set to enter deflecting electric field along the direction perpendicular to electric field line.
Specifically, the first distance moved according to the edge of ink droplet in the electric field perpendicular to electric field line, the in the electric field edge
It is specific that the electric field strength of the second distance of electric field line movement, the quantity of electric charge of default charge and deflecting electric field calculates droplet volume
Are as follows:
First distance, the In that edge of the ink droplet of nozzle ejection in deflecting electric field is moved perpendicular to electric field line are obtained in batches
The second distance moved in deflecting electric field along electric field line；
Ink droplet is calculated according to the electric field strength of first distance, second distance, the quantity of electric charge of default charge and deflecting electric field
Volume；
Wherein, the first distance and second distance of the ink droplet that at least two nozzles spray are obtained every time.
It is specifically, described that ink droplet is made to have default charge specifically:
Start the ink droplet for spraying nozzle with the default charge every first time period；
The ink droplet for spraying nozzle in second time period has the default charge.
Device, the system and method for a kind of measurement droplet volume that the embodiment of the present invention proposes spray in drops out from nozzles
Afterwards, speed is specific, and in a linear relationship between speed and volume, and ink droplet enters charging chamber, so that ink droplet is with default
Charge enters back into deflecting electric field, and after the ink droplet with default charge enters deflecting electric field, motion profile deflects, and
Speed along the direction perpendicular to electric field line will not change, and then can be by measuring ink droplet in deflecting electric field along vertical
The first distance directly moved in the direction of electric field line, and the second distance moved along electric field line direction carry out counter push away and locate ink droplet
Volume, and then the flying distance of ink droplet can be adjusted by adjusting the quantity of electric charge of electric field strength and default charge, due to electric field
The order of magnitude of intensity and the default quantity of electric charge is smaller, and flying distance can amplify minor change caused by drop speeds, and then make
The calculating for obtaining drop speeds is more accurate, and has certain linear relationship between the spouting velocity of ink droplet and the volume of ink droplet,
Therefore the volume of calculating ink droplet that can be more accurate.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of system for measuring droplet volume provided in an embodiment of the present invention；
Fig. 2 is a kind of another structural schematic diagram of system for measuring droplet volume provided in an embodiment of the present invention；
Fig. 3 is a kind of another structural schematic diagram of system for measuring droplet volume provided in an embodiment of the present invention；
Fig. 4 is a kind of another structural schematic diagram of system for measuring droplet volume provided in an embodiment of the present invention；
Fig. 5 is a kind of another structural schematic diagram of system for measuring droplet volume provided in an embodiment of the present invention；
Fig. 6 is a kind of another structural schematic diagram of system for measuring droplet volume provided in an embodiment of the present invention；
Fig. 7 is a kind of flow diagram of method for measuring droplet volume provided in an embodiment of the present invention；
Fig. 8 is a kind of another flow diagram of method for measuring droplet volume provided in an embodiment of the present invention.
Drawing reference numeral explanation:
1- acquisition component, 2- charging chamber, 21- substrate, 3- electric field chamber, 31- first voltage plate, 32- second voltage plate, 4- control
Component processed, 41- charge power supply, 42- controller, 5- print cartridge, 51- spray head, 52- nozzle, 6- processing circuit.
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment a kind of measure the device of droplet volume, system and method it are specific real to proposed according to the present invention
Mode, structure, feature and its effect are applied, detailed description is as follows.
On the one hand, as shown in Figures 1 to 6, the embodiment of the present invention also provides a kind of device for measuring droplet volume, the device
Include: charging chamber 2, charging chamber 2 be used for be oppositely arranged with nozzle 52 so that nozzle 52 spray ink droplet enter charging chamber 2 in, and
And for making ink droplet have default charge；Electric field chamber 3, electric field chamber 3 are connected with charging chamber 2, and deflection electricity is formed in electric field chamber 3
, for deflecting ink droplet；Acquisition component 1, acquisition component 1 are set in electric field chamber 3, and acquisition component 1 exists for obtaining ink droplet
The second distance moved along the first distance moved perpendicular to electric field line, in the electric field along electric field line in deflecting electric field: processing
Circuit 6, processing circuit 6 are connected with acquisition component 1, and processing circuit 6 is used for according to the first distance of ink droplet, second distance, pre-
If the quantity of electric charge of charge and the electric field strength of deflecting electric field calculate droplet volume.A kind of measurement ink provided by above embodiments
The method of drop volume through this embodiment provided by a kind of device for measuring droplet volume implement.
Specifically, charging 2 face nozzle 52 of chamber is arranged, and is provided with multiple nozzles 52 on spray head 51, as shown in Figure 5 and Figure 6,
Row's nozzle 52 is provided on spray head 51, wherein charging chamber 2 can be oppositely arranged with whole nozzles 52, i.e., nozzle 52 sprays
After ink droplet, be able to enter in charging chamber 2, be arranged in addition, charging chamber 2 can also correspond to multiple nozzles 52, when measure and
After the droplet volume of the corresponding nozzle 52 of chamber 2 that charges, mobile spray head 51 makes nozzle 52 and the charging of also unmeasured droplet volume
Chamber 2 is opposite.In general, the front end of nozzle 52 is provided with piezo-electric crystal, piezo-electric crystal generating period under the driving voltage of sine wave
The mechanical deformation of property, before ink ejection operation, piezo-electric crystal is shunk slightly under the control of sinusoidal drive voltage, then, piezoelectricity
Crystal generates primary biggish extension, and ink droplet is released nozzle 52, will fly away from the moment of nozzle 52, piezo crystals at once in ink droplet
Body will do it contraction again, and ink pressure surface is shunk from nozzle 52, in this way, ink droplet liquid level has obtained accurate control, is sprayed every time
Ink droplet has perfect shape and correct heading, wherein the driving voltage that can not only use sine wave can also be adopted
With square wave drive voltage, specific restriction is not done herein.Ink is pre-stored in print cartridge 5, is then sprayed from nozzle 52, and ink is formed
Drop, when ink is also present in print cartridge 5, ink is not charged.In ink droplet also not complete jetting nozzle 52, pre- squeeze is had occurred and that
Disconnected, " squeezing off in advance " refers to that ink is not fully disconnected also, and ink enters charging chamber 2 at this time, due to the effect for the chamber 2 that charges, so that
Charge in ink is there is a phenomenon where producing a polarization, at this moment, if having positive voltage on charging chamber 2, and under the action of electric field force,
Positive charge in " squeezing off in advance " ink, which is electrically charged chamber 2, to be repelled, and then positive charge is close to nozzle 52, and negative electrical charge is attracted, into
And the close charging chamber 2 of negative electrical charge, at this point, so that the ink of " squeezing off in advance " is broken apart, band is negative due to the effect of ink surface tension
The ink droplet of charge is detached from spray head 51 and flies out from charging chamber 2 across charging chamber 2, and positively charged ink droplet is retracted into spray head 51
In.The charge ink droplet of chamber 2 of flying out enters in electric field chamber 3, that is, enters deflecting electric field, the ink droplet moved in charging chamber 2
Speed when speed is sprayed with drops out from nozzles 52 is consistent, and is moved along a straight line.
As shown in Figure 1, acquisition component 1 is arranged in electric field chamber 3, in order to obtain first distance and second distance.Specifically
Ground, as shown in Figure 1, being provided with a column nozzle 52 on spray head 51, nozzle 52 is arranged along the direction of paper inwards, acquisition component 1
After getting first distance and second distance, data are transmitted to processing circuit 6, processing circuit 6 is by being calculated ink droplet inclined
The first distance and second distance for turning a certain moment in electric field, then calculate the volume of ink droplet again.Acquisition component 1 is image biography
Sensor.Specifically, imaging sensor is arranged near first voltage plate 31 or second voltage plate 32, and imaging sensor can be with
For CCD (charge coupling device imaging sensor), CCD can shoot a fairly large number of photo, CCD is taken in the short time
Photo is sent to processing circuit 6, by photo of the processing circuit 6 when wherein picking out the ink droplet will drip, at this point, ink droplet is also
In the sky, it but does not collide with voltage plate also, ink droplet or circle, processing circuit 6 are easier to determine the center of circle, Jin Erneng
Enough guarantee that the value of the first distance and second distance that get is more accurate, as shown in figure 3, showing ink droplet when will drip
S and h.At this point, CCD is arranged towards charging chamber 2.When by obtaining ink droplet drop point to obtain first distance and second distance, such as
Fruit ink droplet drops are on first voltage plate 31, and for CCD towards first voltage plate 31, Fig. 4 is to obtain S's and h by ink droplet drop point
Schematic diagram.CCD can be moved in electric field chamber 3, and the moving track of CCD is provided in electric field chamber 3, and CCD is arranged on motor, electricity
Machine can be moved along track, and track is arranged along the edge of voltage plate, and not in the overlay area of deflecting electric field, motor with
Processing circuit 6 is electrically connected, and it is mobile that processing circuit 6 controls motor.The visual field of CCD is adjustable, when the visual field of CCD is larger,
Accuracy of focusing is lower, and the first distance of acquisition and the value error of second distance are larger.When the visual field of CCD is smaller, focusing
Accuracy is higher, and first distance and second distance are more accurate, and user determines the visual field of CCD according to demand.As shown in figure 5, being same
Position where one moment each ink droplet, since the volume of each ink droplet is different, each ink droplet initial velocity is different, enters
After deflecting electric field, each ink droplet is also different in synchronization position.
The electric field strength and first distance S of the quantity of electric charge of detailed description below droplet volume and default charge, deflecting electric field
Relationship between second distance h, specifically, V are droplet volume；Drop mass m；Ink droplet has pre- after overcharge chamber 2
If the carried charge of charge is q；The electric field strength E of deflecting electric field；Speed when drops out from nozzles 52 sprays is v；
1. V=k1v(k1Coefficient between speed and volume)；
2. m=k2V(k2Coefficient between speed and volume)；
3. F=Eq (F is electric field force suffered by ink droplet)；
4. (a is that ink droplet enters the acceleration after deflecting electric field, the direction of acceleration and the direction of electric field force to a=Eq/m
It is identical)；
⑤(t is the time that ink droplet moves in deflecting electric field)；
1. 2. 3. 4. formula is 5. obtained 6. according to formula
Further obtain formula 7.
Again 7. 8. formula is brought into formula(wherein,)；
Wherein, h, k1、k2, E, q be all known, i.e. k3For constant, therefore the relationship between the size of S and speed v can be with
Determine, due to S withIt is directly proportional, therefore in the case where v is certain, the S value measured in the application is bigger, also, the value of S can
Increased with the value by adjusting E and q, simultaneously because it is in a linear relationship between v and V, i.e., the case where V changes
Under, v changes therewith, and the variation of v can be showed by the amplification of S, and then the test of speed can be sensitiveer, and
The precision of tachometric survey also will be bigger, and the measurement of volume also can be more accurate.Wherein, if to the change that v is further amplified
Change, i.e. increase S, the value of change E and q can be passed through.
By formula 8. it can be concluded that formula 9.
Formula is 1. 9. obtained 10. with formula in conjunction with formula
It can be derived that the volume of ink droplet by above calculating, and the method for this kind measurement droplet volume is more accurate.
And in the prior art, the method for measuring droplet volume, speed v when being sprayed due to the volume V and drops out from nozzles 52 of ink droplet is had
Linear relationship, can also be by measuring the speed v of ink droplet to obtain the volume of ink droplet.This method calculates droplet volume precision
Centainly promoted, but be constrained to ink droplet flight distance is too short and ink droplet flight picture-taking position stability, error is also larger,
The application accurately to calculate droplet volume by extending ink droplet along the flying distance of emission direction.Here, it should be noted that one
Point for same ink droplet, moves rail when the motion profile by obtaining ink droplet is to obtain first distance and second distance
The corresponding first distance in difference and second distance difference on mark, and synchronization, the different ink droplet of volume, it may have different
First distance and second distance.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
Specifically, as shown in Figure 1, control unit 4, control unit 4 are used to be connected with charging chamber 2, control unit 4 is used for
Apply predeterminated voltage to charging chamber 2 every first time period, applies predeterminated voltage to charging chamber 2 and continue second time period.Specifically
Ground, control unit 4 include charge power supply 41 and controller 42, and the anode of charge power supply 41 is connected with controller 42, controller
42 for control the predeterminated voltage every first time period to the charging application second time period of chamber 2, and the cathode of charge power supply 41
Ground connection.Nozzle 52 sprays a melted ink at regular intervals, and time interval is very short, therefore can in a short time repeatedly
Spray ink droplet, when obtaining the first distance and second distance of ink droplet, usually by acquisition component 1 by repeatedly movement Lai
The first distance and second distance of whole ink droplets are obtained, and when acquisition component 1 is moved to the next position by current location, it needs
By preset time period, ink droplet, can be energy saving without electrification at this time, wherein first time period is acquisition component 1 by current
The time required to position is moved to the next position, and second time period is that acquisition component 1 obtains needed for first distance and second distance
Time, wherein second time period is greater than is sprayed by nozzle 52 until the required time is dripped, in order to guarantee to adopt equal to ink droplet
Collection component 1 can get whole motion profiles, and then can choose ink droplet and will drip the first distance and the at moment
Two distances, at this point, ink droplet is still in the sky, shape is circle, facilitates and obtains the center of circle.
Specifically, as depicted in figs. 1 and 2, charging chamber 2 includes two substrates 21 being oppositely arranged, and two substrates 21 with
The same electrode of control unit 4 is connected.Charging chamber 2 includes two opposite substrates 21, two substrates 21 with control unit 4
The same electrode be connected so that two substrates 21 have positive electricity or negative electricity.When two substrates 21 with control unit 4
Anode when being connected, at this point, two substrates 21 are positively charged, two positively charged substrates 21 enable to ink droplet negatively charged,
On the contrary, electronegative two substrates 21 enable to ink droplet positively charged.
Specifically, as shown in Figures 1 to 4, electric field chamber 3 includes first voltage plate 31 and second voltage plate 32, first voltage
Plate 32 for being connected with the anode of power supply, second voltage plate 32 for being connected with the cathode of power supply, first voltage plate 31 with
Deflecting electric field is formed between second voltage plate 32, acquisition component 1 is set to outside deflecting electric field.It wherein, include the in electric field chamber 3
One voltage plate 31 and second voltage plate 32, first voltage plate 31 and second voltage plate 32 are connected with the anode and cathode of power supply respectively
It connects, so that first voltage plate 31 is positively charged, second voltage plate 32 is negatively charged, just can be in first voltage plate 31 and second voltage plate
Deflecting electric field is formed between 32, wherein deflecting electric field is preferably uniform electric field.It can be beaten after ink droplet enters electric field chamber 3
On one voltage plate 31 or second voltage plate 32, if ink droplet is positively charged, then ink droplet is beaten on second voltage plate 32, if ink droplet band is negative
Electricity, then ink droplet is beaten on first voltage plate 31.
Specifically, the direction of the electric field line of deflecting electric field is parallel with gravity direction.The electric field line of deflecting electric field and gravity
Direction is parallel, and then ink droplet will not be affected by gravity along the move distance in the direction perpendicular to electric field line, is convenient for ink droplet
The calculating of speed.
On the other hand, as shown in figure 5, the embodiment of the present invention also provides a kind of system for measuring droplet volume, the system packet
It includes: measuring droplet volume device provided by print cartridge 5 and any of the above embodiment, print cartridge 5 is connected with spray head 51, sets on spray head 51
It is equipped with a large amount of nozzle 52, the charging chamber 2 of the corresponding measurement droplet volume device of nozzle 52 is arranged, and print cartridge 5 is grounded.The present embodiment institute
The system of the measurement droplet volume of offer includes the device of measurement droplet volume provided by any of the above embodiment, therefore this reality
Whole beneficial effects that example includes the device of measurement droplet volume provided by any of the above embodiment are applied, herein without superfluous
It states.In addition to this, print cartridge 5 will carry out grounding because, the ink droplet of " squeezing off in advance " when opening, with positive electricity charge or
The ink droplet of negative electrical charge can return in spray head 51, and in order to avoid the charge accumulated in print cartridge 5, print cartridge 5 is grounded, and then can will return
To the charging neutrality of the ink droplet institute band in spray head 51.Specifically describe nozzle 52 in the embodiment above, herein without
It repeats, piezo-electric crystal is provided on nozzle 52, the volume and speed that ink droplet sprays and the driving voltage being applied on piezo-electric crystal
Peak value it is related, and then the volume and speed of ink droplet can be adjusted by adjusting the peak value of driving voltage.
On the one hand, the embodiment of the invention provides a kind of methods for measuring droplet volume, as shown in fig. 7, this method comprises:
S1, ink droplet is made to have default charge；After drops out from nozzles 52 sprays, the speed of ink droplet is certain, and from nozzle
It, can be along linear motion after 52 spray.After so that ink droplet is had default charge, ink droplet can just deflect in deflecting electric field, in advance
If charge can may be negative electrical charge for positive charge.
S2, the ink droplet with default charge is made to enter deflecting electric field, ink droplet motion profile deflects；Before ink droplet enters
Motion profile and the electric field line of deflecting electric field be not arranged on the same straight line, in default between the motion profile and electric field line of ink droplet
Angle, wherein default angle is preferably 90 °, as shown in Fig. 2, α is default angle.Ink droplet yaw motion for a period of time after, can drip
Fall, drippage mentioned here, refer to ink droplet by the influence of electric field force and along the direction of electric field force deflect, finally and its
He collides and stop motion at medium.
S3, the first distance moved according to ink droplet edge perpendicular to electric field line, second distance, the default electricity moved along electric field line
The quantity of electric charge of lotus and the electric field strength of deflecting electric field calculate droplet volume.By obtain ink droplet in deflecting electric field along perpendicular to
The second distance h that the first distance S and ink droplet of the direction movement of electric field line are moved along electric field line, 10. by formula then
To calculate droplet volume.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
Specifically, the ink droplet with default charge is made to enter deflecting electric field specifically:
The ink droplet with default charge is set to enter deflecting electric field along the direction perpendicular to electric field line.In order to facilitate calculating ink droplet
Volume, be preferably such that ink droplet enters in deflecting electric field along the direction perpendicular to electric field line, wherein in deflecting electric field
Electric field line is vertical with the direction of gravity, and when such ink droplet moves in deflecting electric field, gravity, without influence, facilitates calculating to S.Its
In, the value of E is preferably 106The value of N/C, q are preferably 10-16C。
Specifically, as shown in figure 8, the first distance moved according to the edge of ink droplet in the electric field perpendicular to electric field line, in electricity
Droplet volume is calculated along second distance, the quantity of electric charge of default charge and the electric field strength of deflecting electric field that electric field line moves in
Specifically:
S3.1, edge of the ink droplet of the ejection of nozzle 52 in deflecting electric field is moved perpendicular to electric field line first is obtained in batches
Distance, the second distance moved in the electric field along electric field line；One row's nozzle 52 is only set on spray head 51, and the quantity of nozzle 52 is more
It is a, when obtaining the first distance and second distance of ink droplet, need using CCD (charge coupling device imaging sensor), still
Since the price of CCD is higher, a CCD or negligible amounts are only set in the device that one measures droplet volume
CCD, by repeatedly shooting image and then getting first distance in deflecting electric field of ink droplet that whole nozzles 52 spray and the
Two distances can get the drop point of whole ink droplets, thus first of the ink droplet by obtaining each nozzle 52 in batches
Distance and second distance can reduce the quantity of CCD, save the cost.
S3.2, it is calculated according to the electric field strength of first distance, second distance, the quantity of electric charge of default charge and deflecting electric field
Droplet volume；It is got in each nozzle 52 after the first distance of ink droplet and second distance in batches, then successively calculates each spray
The volume for the ink droplet that mouth 52 sprays, also after the first distance of the ink droplet of an available complete batch and second distance, just into
Row calculates.
Wherein, the drop point for the ink droplet that at least two nozzles 52 spray is obtained every time.It is criticized to the drop point for obtaining ink droplet
When secondary division, the drop point of the ink droplet of two nozzles 52 ejection can be at least obtained every time, preferably 3, each CCD once can
The first distance and second distance of the ink droplet of 3 nozzles 52 ejection are obtained, is drawn as shown in fig. 6, carrying out region to multiple nozzles 52
Point, wherein three nozzles 52 are a region, the first distance and second distance of the ink droplet that the nozzle 52 in a region sprays
CCD can be obtained simultaneously, and after having obtained the drop point for the ink droplet that the nozzle 52 in the region sprays, mobile CCD keeps CCD mobile
Then region corresponding to ink droplet drop point to subsequent region obtains the position of the ink droplet drop point in the region, by repeatedly moving again
The position of dynamic CCD just can get the first distance at a time and second distance of the ink droplet of whole nozzles 52, at this time
A CCD, which is only arranged, just can satisfy requirement.Certainly, if can be set to shorten the time for obtaining whole droplet volumes
Multiple CCD, and then a batch can obtain greater number of droplet volume, shorten detection time, when two CCD are arranged, one
Batch just can get the first distance and second distance that six nozzles 52 spray ink droplet.
Specifically, ink droplet is made to have default charge specifically: S1.1, to start to make the ejection of nozzle 52 every first time period
Ink droplet has default charge.It proposes in the embodiment above, when obtaining ink droplet drop point, usually by a CCD by multiple
Move to calculate the volume for the ink droplet that whole spray heads 51 spray, and when CCD is moved to the next position by current location, need by
First time period, ink droplet, can be energy saving without electrification at this time, and wherein CCD is moved to the next position by current location and is
Time, i.e. first time period needed for adjacent two batch obtains ink droplet first distance and second distance position.
S1.2, the ink droplet for spraying nozzle 52 in second time period have default charge.Second time period be greater than etc.
It is sprayed by nozzle 52 until dripping the time of experience in ink droplet.When CCD has moved to scheduled position, CCD just starts to need
Drop location is measured, at this point, start so that ink droplet has default charge, it is equal in the ink droplet that second time period inner nozzle 52 sprays
With default charge, specifically, ink droplet can be made to have default charge by the chamber 2 that charges, ink droplet is being made to have default electricity
When lotus, so that charging chamber 2 is connected in circuit, when not needing ink droplet electrification, so that charging chamber 2 and charge power supply 41 disconnect,
Or the voltage that charging chamber 2 is applied is zero.Wherein, second time period is greater than drops out from nozzles 52 and sprays until drippage institute
The time needed, in this way can CCD can get ink droplet from the whole motion profiles for being ejected into drippage, avoid because of time mistake
Short, the distance that ink droplet enters deflecting electric field movement is too short, causes the V value calculated incorrect.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of device for measuring droplet volume characterized by comprising
Charge chamber, and the charging chamber with nozzle for being oppositely arranged, so that the ink droplet that nozzle sprays enters in the charging chamber, and
And for making ink droplet have default charge；
Electric field chamber, the electric field chamber are connected with the charging chamber, and the electric field is intracavitary to be formed with deflecting electric field, for making ink droplet
Deflection；
Acquisition component, it is intracavitary that the acquisition component is set to the electric field, and the acquisition component is for obtaining ink droplet in deflection electricity
The second distance moved along the first distance moved perpendicular to electric field line, in the electric field along electric field line in:
Processing circuit, the processing circuit are connected with the acquisition component, and the processing circuit is used for according to the first of ink droplet
The electric field strength calculating droplet volume of distance, second distance, the quantity of electric charge of default charge and deflecting electric field.
2. the device of measurement droplet volume according to claim 1, which is characterized in that
Further include: control unit, the control unit with the charging chamber for being connected, and the control unit is for every the
One period applied predeterminated voltage to the charging chamber, applies predeterminated voltage to the charging chamber and continues second time period.
3. the device of measurement droplet volume according to claim 2, which is characterized in that
The charging chamber includes two substrates being oppositely arranged, and two substrates are connected with the same electrode of control unit.
4. the device of measurement droplet volume according to claim 1, which is characterized in that
The electric field chamber includes first voltage plate and second voltage plate, and the first voltage plate with the anode of power supply for being connected
It connects, the second voltage plate with the cathode of power supply for being connected, shape between the first voltage plate and the second voltage plate
At there is deflecting electric field, the acquisition component is set to outside the deflecting electric field.
5. the device of measurement droplet volume according to claim 1, which is characterized in that
The direction of the electric field line of the deflecting electric field is parallel with gravity direction.
6. a kind of system for measuring droplet volume characterized by comprising
The device of print cartridge and measurement droplet volume such as described in any one of claim 1 to 5, the print cartridge are connected with spray head, institute
It states and is provided with multiple nozzles on spray head, the nozzle corresponds to the charging chamber setting of the measurement droplet volume device, the ink
Box ground connection.
7. a kind of method for measuring droplet volume, for measuring the device of droplet volume as described in claim 1, feature exists
In, comprising:
Ink droplet is set to have default charge；
The ink droplet with default charge is set to enter deflecting electric field, ink droplet motion profile deflects；
According to ink droplet being moved along the first distance moved perpendicular to electric field line, in the electric field along electric field line in deflecting electric field
The electric field strength of second distance, the quantity of electric charge of default charge and deflecting electric field calculates droplet volume.
8. the method for measurement droplet volume according to claim 7, which is characterized in that
It is described that the ink droplet with default charge is made to enter deflecting electric field specifically:
The ink droplet with default charge is set to enter deflecting electric field along the direction perpendicular to electric field line.
9. the method for measurement droplet volume according to claim 7, which is characterized in that
The first distance moved according to the edge of ink droplet in the electric field perpendicular to electric field line is moved along electric field line in the electric field
The electric field strength of second distance, the quantity of electric charge of default charge and deflecting electric field calculates droplet volume specifically:
First distance that the edge of ink droplet that nozzle sprays in deflecting electric field moves perpendicular to electric field line is obtained in batches, is being deflected
The second distance moved in electric field along electric field line；
Droplet volume is calculated according to the electric field strength of first distance, second distance, the quantity of electric charge of default charge and deflecting electric field；
Wherein, the first distance and second distance of the ink droplet that at least two nozzles spray are obtained every time.
10. the method for measurement droplet volume according to claim 9, which is characterized in that
It is described that ink droplet is made to have default charge specifically:
Start the ink droplet for spraying nozzle with the default charge every first time period；
The ink droplet for spraying nozzle in second time period has the default charge.
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