JPS5898260A - Ink injection printer and method of charging ink drop - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The method relates to a method, in particular for accurately depositing a droplet on a recording medium.
The present invention relates to an improved printing device calibration method and apparatus for printing.

No. 4,258,804 states that 11
An ink jet printing device for recording v1lI is disclosed. This printing device uses a linear array of nozzles to print each nozzle, one segment of a column of pixels in the desired raster pattern. The r1iJ element is
Through a process of first selectively charging the inner middle cylinder with the inner middle cylinder coming out of the noil, and then deflecting the upper Nr' Teiden charged inner middle cylinder from its initial trajectory to a desired location on the recording medium. It will be recorded.

The ink drops from adjacent nozzles are "stitched" together and all of the pixels of one row are printed without gaps or overlaps in the printing area. This alignment is made by first observing the printing device operation during the calibration step. Specifically, we determine the charging voltage required to deflect an ink droplet along a particular calibration path VC, and use this to determine the appropriate charging voltage for the inner barrel to deflect it +m along other paths. Determine.

U.S. i3i Patent Application No. 296, filed August 27, 1981, by Crean et al.
No. 922, Title of the Invention [Method and Apparatus for Bipolar Injection at J (Blpolar Ink
Jet Msthod and Apparat
US) is the above rice! il*#l! F No. 4,238
, No. 804 (7) discloses a configuration that is a modification of the configuration. According to this modified configuration, the cough ink droplets are charged either positively or negatively when the inner tube splits from the inner jet column. That's why we call this duality.

When applying interlaced aluminum, this is combined with the bipolar charging method to separate the ink cylinders from each other in the path toward the aversive medium, thereby weakening the drop-to-print interaction and improving the ink droplet placement. Accuracy can be increased.

The multiple noils in the configuration of the U.S. Pat. No. 1 and U.S. Patent Applications vary the operating characteristics and allow each noll and its associated charging and deflection devices to be individually calibrated. The correct charge number on the ink part to direct the ink drop from one nozzle to the corresponding pixel is different from the iE L charge for the nozzle in play. This difference is caused by some error in the direction of the nozzle or by a change in the deflection electric field. Regardless of the cause, it is possible to monitor the error and use the information gathered to correct the charging voltage so that the ink droplets are +E.
It is important to provide an accurate method for VC to hit the desired location on the media.

Briefly, the present invention provides a mechanism for accounting for inconsistencies in the operation of the VC. The preferred correction method is periodically applied to each nozzle 1 as updated correction data is obtained, thereby causing each nozzle to direct ink drops to its desired location.

An apparatus constructed according to the present invention includes an in-in-in-tube generator for directing one or more ink jets toward a 5R'' recording medium such as paper or the like. When the ink droplet breaks up from these jets, the ink droplet is charged by a tube or charging electrodes with a charge corresponding to the desired ink droplet trajectory. , passing through a deflection electrode that generates an electric field that deflects the indentation part from its initial trajectory to the desired trajectory.The most important feature of the invention is the charging that changes the charge to account for the operation of the nozzle. This is the circuit connected to the electrode.

The circuit includes a portion that determines the charging signal for each ink drop. A second portion of the circuit modifies this charging signal by an amount commanded by the actuation of the nozzle that produces the ink drop. This change is performed by scaling the charging signal L1 using a first correction coefficient and adding or subtracting a second correction coefficient to this scaled value. The principle of changing the charging signal in this way will become clear from the examples described later.

Indeed, the example modification circuit 1lI8 operates on the digital data signal and d! The scratch signal is converted into a 7F0 voltage by a digital analog circuit. First, the ambiguous zone [
Measure the signal from a memory lookup table.

This table stores the charging signal as a function of the charge characteristics of the desired pixel location and of other ink fountains generated from the same nozzle in front and behind the ink drop under consideration. .

This initial digital charging signal is then subjected to scaling and deviation processing to produce a modified charging signal in digital form. In a preferred embodiment, Fi,
This modification step takes place in a dedicated wiring circuit ζ. Regarding this circuit, the embodiments of the present invention will be described later.

As is clear from the above, the purpose of this S# is to determine the operating characteristics of each ink jet nozzle in the ink dip marking 4F device as a function of time and/or position along the ink 4I flow array number ζ. As it changes, it generates a charging signal that is accounted for. Other objects, features and advantages of the invention will become apparent from the following detailed description of embodiments of the invention with reference to the drawings.

Referring to FIG. 1, the figure schematically illustrates an in-jet printing device 10 comprising an in-in jet generating device 12 having a manifold for projecting a plurality of jet columns 14. As shown in FIG. The generator 12 is connected to an ink reservoir 16 from which ink is conveyed to the generator 12 by means of a four-wheel drive 18. The pump 18 directs ink in the generator 12 toward the ink jet generator 12 through an orifice in the manifold toward a printing member 20 moving along a printing plane 21 (FIG. 2) K. Maintain sufficient pressure to eject. Also coupled to the generator 12 is an acoustic exciter 22 that causes the jet column 14 to break up into meridian drops 24 at a particular distance from the generator 12 . The jet column 14 is an individual inner cylinder, 2
As the charging electrode 26 splits into 4, the charging electrode 26 charges each in! according to the design for the subsequent desired in-in! ?
Electrode 28 for generating an electric field with a charging charge *26), which causes a net charge on the droplet, and possibly a di number.
is provided, and a voltage is applied to the electric field generating electrode to generate an electric field through which the charged ink droplets should pass.

As is well known, a charged particle passing through an electric field experiences a force that is related to both the magnitude and polarity of the charges on the particle (the strength of the electric field through which the particle is passing). The undisturbed ink droplets pass through the electrode 28 unimpeded and are guided by internal forces to the recording member 20. The charged particles will be bent in their initial trajectory VC depending on the magnitude and polarity of their charge. As each ink drop passes through the charging electrode 26, the charging electrodes 26 are bent or redirected toward the desired portion of the recording medium by applying an appropriate 4 ft voltage to the charging electrode. The highly charged ink droplets are directed to the trough 30 for recirculation to the ink reservoir.

Ink droplets that are uncharged or are insufficiently charged to direct their trajectory toward the gutter 30 are directed to the recording medium 20 through the ink droplet height 32 . An ink drop sensor 32 is used to sense the passage of an ink drop toward the recording medium, and to modify the operation of the printing device so that the drops from the plurality of jet columns are properly interlaced, thereby creating a record. Each area of increasing gradient on the media
Be covered by an ink droplet coming out of one of the nozzles. An example of the use and application of a typical in-center sensor 32 is disclosed in US Pat. No. 4,255,754. This US patent is incorporated herein by reference. Ink droplet? The 320 function is to calibrate the printing device by observing the trajectory of the incoming drop while operating in calibration mode.

A second gutter 34 for ink droplet circulation is used to capture ink droplets generated during calibrating the printing device using the ink droplet sensor 32.

One application for which the invention is particularly suitable is in high speed ink jetting devices, in which successive sheets of paper are passed through an ink jet printing device and encoded with information. Experience has shown that it is advisable to periodically recalibrate the printing device to direct the droplet 24 to the desired area of the recording member 20L.

To perform this calibration, an ink droplet is generated and passed through the sensor 32 without the lir' edge member 20 in the predetermined position # to receive the ink droplet. Therefore, with this calibration mode of operation in mind! i: The trough 34 is arranged to supplement ink drops when no recording member is present.

FIG. 1 also shows the transport mechanism. A transport mechanism 36 is used to move unmarked sheets of paper or similar material past the markings [10] at a controlled speed. It is necessary to provide the transport mechanism 36 with a mechanism for peeling off the marked paper from the transport mechanism once the paper has been sent to and encoded by the printing device 10. #Feeding mechanism 3
These aspects of FIG. 6 are not shown in FIG.

Is the generation of ink droplets, charging, and transportation of the recording medium all done by a central processing unit? ! 1 is operated by the control device 38,
Fa control device N is a digital-to-analog converter and an analog-to-digital converter 40 and L'44
interfaces to various components of the printing device 10.

As shown in FIG. 2, an array 32 of sensors is positioned in close proximity to the printing plane on the recording medium. The ink droplets 24t-t in the ink droplet stream, shown in dashed lines, fly toward a target and strike a predetermined pixel within the print line, or are deflected into the trough 30.

During printing, a voltage is applied to the charging electrode 26 to charge a jet of ink that sweeps the length of a segment within a scan line. Points 54 and 56 represent adjacent pixels in the scanning plane or printing plane [121]. The ink droplet stream 58 from the oldest ink droplet stream is applied to ui*54, and the image is $5.
6 is hit by an in-nakazuke that follows the trajectory 60 from the ink droplet flow next to the left. A raster 1li such as the one shown in FIG.
In the i-printing device, the ink droplets from adjacent direct ink streams are "combined", that is, the printing process [fi21
It is essential to match the ideal pixel location within the image.

For ink droplets that cannot be directed to the target during printing,
The droplet is charged with a magnitude that causes it to follow a trajectory that intersects the gutter 30. Trajectories 62 and 64V'i, m are the trajectories that self-ink melting follows to the gutter in the two ink streams on the left.1. This is shown as a representative of Ike no I/#r^ style 6ζ. Ink droplets with a zero-band W value fly along a path toward a trajectory that is not affected by the deflection electric field between the electrode plates 28. A zero charge value of L is used only if the zero charge value results in an ink drop reaching one of the backs of equally spaced pixels in the printing plane 21.

Sensor array 32 is used to calibrate the ink drop charge. The array is an assembly including a plurality of ink drop sensor locations 66a through 66e spaced at regular distances along the sensor array. This Sen? The spacing is equal to the nozzle spacing above.The centimeter position is where the ink droplet in each ink stream crosses the two sensor installation locations.

Selected to be deflected towards the road. This is important for the stitching operation. For example, 1. A single ink droplet is charged to a voltage that causes it to travel through a trajectory 67 past a sensor 66c. One insulator is then charged so as to follow the path 69 beyond the senna 66b.

The electric field generating electrode 28 is alternately applied with ground and a positive voltage +B across the width of the printing device play.

By directing the ink droplet into the center between the deflecting electrodes, the ink droplet is charged positively and negatively on the left and right sides at its point of formation. This bipolar charging method has the advantages pointed out in U.S. Pat. No. 296,922 to Moe.

Generation of a digital charging signal relating to the charging voltage applied to the charging voltage 1126 is carried out within the control unit 38 by a programmable processing unit 110 and a 7-double data manipulation system f112 to 117 (FIG. 3). This is done in combination with interconnect circuitry from a series of custom-designed integrated circuits. These data manipulation steps 112 to 1
The result of step 17 is an N-pit (12-pit in this preferred embodiment) voltage display, which is converted to an analog signal, amplified, and charged with a charging voltage of 2.
61ζ horn 0 is raised.

- A video input terminal 120 to the IC recording medium 20 is shown in the left-hand portion iC of FIG. This data consists of a series of print/no print commands that are transmitted as bits, e.g., a set or high level bit is a set or a high level bit that is used to print a particular print on paper. A reset or zero bit indicates that the drop corresponding to this bit should be sent to the gutter 30.

The above-mentioned method for converting these video signals into analog charging voltages is based on the so-called "Mother Eveline J method", in which the digital holding renostar is connected to the above-mentioned video human power generator and the charging voltage 11fj7. .26 connected in series to the digital analog converter 42. The controlled clocking of these renosters allows the digital data to step through the processing path from one renoster to the next. be moved.

As the data progresses through the upper P-die line, the parrot data is processed according to the format described below.

After the clock pulses generated by the individual controllers, the data in the above nine ideal lines has passed through all the processing stations and reached one stage, where the data is The actual mechanical fabrication of the analogous line described above can be carried out in various ways depending on the possible output of the circuit with the control device 38. It corresponds to a function, not a specific circuit.

The first step in the above-described process is to store the video bit data in buffer 112 and mark 4! for a large number of pixels. or to allow unprinted information to be obtained for processing. The size of this buffer 7 or storage can be changed depending on the usage.
In one embodiment, the buffer has a track t large enough to store four consecutive edge pixels at any given time. Each clock interval of the control device 1 and the pixel bits for each of the four cliffs straddling nozzles 1ζ constituting the marking device 110 are set at the upper ruby buffer 11 and 9 f': ) is read out.

The stored information consists of each l in sequence that traverses the paper segment of a given nozzle! A series of binary bits for the desired print or no print information for the i-Desk. However, as the above data continues to be output from Paranoia, the data is interlaced in the next step 113, and in this way, the data stored in the data buffer enters the 1:note/9 ideal line. sometimes scrambled. This scrambling or interlacing of the bit information is accomplished using an interlace lookup table that indicates the pattern in which the bits stored in the controller are to be patterned. In one embodiment, this interlace table is located in a portion of controller memory.

When an interlaced ink drop signal exits the buffer region, a charging No. 16 is generated for this ink drop. This signal relates to the charging sequence for this ink drop and the ink drops before and after the desired pixel location relative to the inner cylinder. In a preferred embodiment of the present invention, this information is used to generate a bit-turn corresponding to a one-time address &C in the controller's address space.

As an example in the illustrated embodiment of the invention, each nozzle is assumed to be directed at 121 elements across the width of the paper. That is, four bit locations in the address space indicate the pixel location for one viewed inner barrel. Take into account the 11 in-center pickles history (the in-center tube we are currently considering, plus the other 10 drops) when calculating the correct charge for the in-center drop we are currently considering, and use these 11 bits as The information (printed or unprinted) is combined with the above four pixel indication bits to create a 15-pit sequence regarding charge history and pixel location. Since the direction of the deflection field alternates across the width of the array, one extra #H bit is required to separate the odd numbered nozzles and the one-magnitude nozzles. This combination of factors results in a 16-bit sequence of bits that applies to the address RLti in the control memory space. When this at9 reply is generated in step 114, a 64K x 10 bit memory lookup table is generated in step 115.
Accessed in 10 years ago ink Mitl
k pressure. If an ink history of less than 11 is used, a smaller lookup table can be used to create the correct ink mL history.

The ink history look-up table compensates for the possibility that a series of ink drop charges may be subverted and cause some errors in ink strip placement. This look-up table shows that a series of oriented ink drops, which are at a high potential i*t, are located not too far from +jM30 without entering the well. Ink droplet placement is improved in the case of moistening leading and trailing ink drops that are planned to hit the recording medium. In this case, the drop-drop interaction is significant, and the look-up table provides a means to account for this interaction and provide accurate ink placement conditions.

The actual values stored in the lookup table are derived from experience derived from theoretical model construction of the inkjet print process and from observing actual drop-drop interactions and their effects on ink puddle placement. be led out. The most efficient method is to think of a pattern (printed and unprinted) that corresponds to each series of ink drops (mother turns), and then apply pressure in the look-up table at the neck where the ink drops hit the right place. It's about adjusting. A fourth and quickest method is to experimentally determine the voltage value and then interpolate mathematically the remaining Lookazzo fog table values. Lookup fist table occurrence process.

This is simplified by a computer model of the Coulombic and aerodynamic interactions of the ink.

Next Stella f116 in pipeline processing ↓,
・Ite v, 1, notification ・'Tagawa 4' Emperor induced by coming to Hinoki 26 41 Naru Song Dynasty? To account for r'...sweat 12 (data from the Kirtsk Assol table is ψ). When the ink jet is formed, the charge on the ink part.

It is known that the pressure is determined by the 4 pressures of 1 skewer and 26, and also by the weight of the ink r# and h immediately before that. A stone boundary is created in the vicinity of the ink droplet formation in these 11 imperial ink droplets, and therefore, when combined with the ink droplet induced by the electrode 26, a l charge is induced. The electric current 4r on the ink stream J in front of the ink circle that is thinking about the bones is striped 4. (Se no 12
Since I understand the bitteiteiden signal (J2, at least approximately), this 1st zo-1 + E
In order to perform 'fr', wait for the charging signal to eclipse. Fu#r
In the arm compensation snap 116, horizontal filter operation is performed according to the following equation.

t, lc('III+')ensated = 01
-1- a Dt-1+ L) Dt-2+ Cot-
61・'t(: t a + b %CU at k
, marking # device and r key problem and t, -C construction of a nozzle that emits an ink sphere! i+2] is a constant determined from the characteristic.

Ink 71Ii] Hikaru Ta ink t1^H4m
bk M 2 necessary to determine these constants for IJ4
#Characteristics. That is, this is because it specifies the distance of 1111 between these ink strips 1'1-17 and their preceding ink strips. D, D, etc.

The t t-1 signal is the data value for the ink strip in front of the ink strip being compensated.

The main point of the present invention is in the following Stella f117: VAVi. In this step, the nozzle action is arranged in a row-'
In order to take into account the changes in the action of the phase electrodes and the direction electrodes, so-called gain and deviation factors are applied to the #+blind double signal. This 1#II difference and gain step 1jV
This is carried out by an LsI NMO3 signal processing device [122], and a block diagram of this device is shown in FIG.

In the center of processing bag #122, there is a 12-bit power 1 device/additional unit that consumes data from the preceding 7,000 Eveline Renosta.
There is a V unit 124. Toya □□□/Ka #me 124 generates modified data Dm given by the following expression: Dm=Dom+a. Upper dL: Formula V Kofu・ite, D
o is the 12 bit-data value as the charge compensated in step 116. The number of nozzles is 1, which is specific to each nozzle, and changes over time during the operation of the printing device H.

In this preferred embodiment, the multiplication valley/addition: vessel 12
In the above channels, one nozzle is defined as one nozzle and one charging device for its accompaniment, and one directing device g. By its nature, the calculator/power 11J4 unit 124 must be capable of applying 32 sets of constants m and a of phase 14 at 711 to the data input thereto. It's your turn to complete this task 'cr,j',3
The two constants m and a are stored in two 32-bit long and 12-bit wide incremental shift registers 126 and 128. These registers have data in the multiplier/adder 1
il acts on the data when clocked via il.

Squared @ :=4 / 10B recorded by Kakiki 124
The digital-to-analog converter 42I of the digital converter 32 is turned over. Each of these converters is connected to an output multiplier 52 to generate both positive and negative voltages that are added to charging 11L.

An auxiliary or f-type device for varying the data input by constants m and a is shown in FIGS. 5a and 5b.

Although the preferred multiplier/adder includes circuitry for modifying 12-bit data, FIGS. 5a and 5b show circuitry for modifying 3-bit data. Although its operating principle can be directly extended to 12-bit data, it has been simplified for convenience of illustration.

It has a mother Eveline type configuration with 124 vehicles/adders. The 3-bit circuit (see Figure 5a) has three data population DQ%0. ．．
Including 02. Constants m and a that act on this data
It is stored in the li shift register 126°128,
It is clocked through the above register at the same frequency as the W load data. Shift register 126.128Fi Series of column-connected amplifiers and switches 126a, 126b, 12
6c, 128a, 128b, 128c%, etc., and the selected output terminal is connected to the gP container/adder 12.
40fPfl. In this way, one emperor
When the data for the b-river pole enters the cutting/equipment + 1122, when this data passes through the multiplier/additional unit 124, the same m and a f sarako act on the data. do. Multiplier/Adder] Each of the first three stages of 24 comprises three full adders 130°1:(2,134) and three data latches 136°138.140 during the valley clock cycle. , human data Do% D
l, D2 are multiplied by X days and this sum is forwarded to the next stage. Operate the button. In this way, the first stage is created! During 1111, the lowest I to "l bits from 1 multiplier shift register 126 are transferred to AND input terminal 142 on full adder 134. Adder shift register 1
The constant from 28 is passed to power 11 via the most significant bit of the adder.
Therefore, in the first stage, the maximum) 1V
An adder constant of is added to the result. This table history adjacent data is 1st order, the number of paddy grains is 144.146, 14
8 and data latches 150°152.154. The output from the above-mentioned multiplier/grip device is:

12 modified data pins transferred to the data bus
This is a series of DrnO, Dml ``rn2...''.
= Dom10a ◎ The constants m and a can be loaded into the shift registers 126 and 128 via the two-way multiplexer 156%158. Roto° input 160 to these two multiplexers
is at a high level.

5iIT data is loaded into the recirculating shift register. When the low P input 160 is at a low level, the data of 1m' or rl'ia is transferred to the shift register.

The last register in the series of stars (12 in Figure 5b)
61 and 1281) to the first shift register. During operation of a typical printing device, f1! child m
and 8 are updated only occasionally, so it takes 160 hours per person.
is generally at a low level when the f-saraji is recycled. When the change is over, these are calculated by the control device, i.e., the processing device +7110.
It is caged in shift reno stars 126 and 128 for circulation tables.

The sum of the values m and a is negative during the operation of the calibration mode P, and during this operation, the operating light sensor 47S-1 of the
' Monitor ζ power with Ray 32. The amount of energy required to guide the ink through each of its two sensors * ) fl t
The W pressure is the ink jet mark*! 1 for each nozzle in 11
be served. The data from the Mishiki/Adder 124ri data lookup table is expressed as vm;V,m+a
Change accordingly. In one method, first set m equal to the voltage signal required to send the ink layer across the sensor. [7] However, the voltage signal Tt (uniform data signal V) is known from the data look-up table. Therefore, the controller 110t has the task of solving two equations for two unknowns. The format of these yj pestle formulas is as follows @ vT'TI (sen v1): Vo, ('known) m+av
nl (sensor 2) = Vo2 (intelligence) m-1-a The controller 110 controls the modifiers m and a.

This information is input into the recirculation shift register 126 so that it can be applied to the data as it is transferred to the data line.

Although this method for simulating the modifiers m and a is the preferred method, other sensing and/or iterative computations can be performed to obtain the i 111 of m and a.

The f-historical output data is transferred to the data bus.

The paths are connected to each of 32 different digital-to-analog converters 42 that are used to convert digital charge data into analog night pressure signals. The circuitry connected to a typical digital to analog converter 42 is shown in FIG. As shown in Figure 6, each digital
An input latch 164 to the analog converter is connected to data bus 165K. This data latch 164
Tj.

Only chip select inputs 166 and 6 from controller 1110 provide an indication that the data on the data bus is generated for this digital-to-analog converter. We will have lunch at z1. Control wave [chifl from 110! Selection input 16
6 and data strobe signal 168 occur simultaneously.
The data on the data bus is transferred to the first latch circuit 164.
strobed within. After a number of controller clock pulses.

This digital signal from the @1 latch 164 is -2
The second latch transfers this digital data to the digital-to-analog converter 42.

The delay between the reception of data by the first latch 164 and its transfer to the second latch 170 is provided by a programmable register 172 consisting of a series of flip-flops forming a countdown counter.

Each 7-lip 70-horn has a long terminal from a latch 176 that is connected to the latch to determine the amount of delay between the reception of data by the first and second latches connected to the analog-to-digital converter. A series of inputs 178a to command
to 178e by the controller 110. Data is entered into this countdown register upon receipt of a phase strobe signal 180 from the controller. The countdown register 172 counts out due to the fk continuous clock/l system from the gt2 control device.

Clock pulse 18 for the second data latch
Generates 2. This data delay ensures that the charge signal appearing at output terminal 184 of digital-to-analog converter 42 appears at the appropriate time with respect to ink drop formation from print loading.

The analog signal from the digital-to-analog fist converter 42 is a relatively low level signal that needs to be amplified by a power amplifier 52 and transferred to the associated charging electrode. Since the ink droplet generation frequency f of a typical ink jet printing device is on the order of 1200 KHz, both the digital-to-analog converter 42 and the amplifier 52 must be capable of rapid operation.

The modifiers m and a change the charging voltage according to the sensed operation of the ink jet printing device to increase the ink supply (1F).
New corrections are made in consideration of changes in directivity and changes in the gain of the charging circuit. This is done by making the consistency or directionality ψ become fushiko11, and the 11th? The change in % is performed by changing the modifier m. Typical modifiers m and atrr are binary 12-bit numbers, so they contain binary numbers from 0 to 4095. Completely traversing the assigned ink jet segment results from a narrow width b passing through the modifiers m and a of 2000 and 1900, respectively. In the spread covered by these ink droplets, rice cakes and
It can be increased by changing Fumiko m from 2000 to 2500, which is normal.

The misdirection can be corrected by modifying the modifier a from 1900 to 23001C.

Making these changes changes all charging signals sent to the digital-to-analog converter.

The desired ink ejection action (i.e., correct direction and spread of ink droplets from a single nozzle) is met. These values of m and a are IJ! One method for updating is as described above. That is, in the above, a method for solving two equations and two fractional numbers has been described. Using an iterative method, one can systematically vary f, m and a to determine the "correct" values.

The gain and deviation modifiers described above are useful in any type of ink jet printing device in which the position of an ink droplet on a recording medium is varied by varying the amount of charge placed on the ink droplet.

Therefore, in the above, one preferred bipolar embodiment of the present invention has been described, but modifications and/or modifications of the present invention may be made within the scope of the spirit of the present invention as described in the scope of the 1% lyF restriction.
Or change is possible.

[Brief explanation of the drawing]

Figure 1 is an assembled plan view of the ink jet device 11, Figure 2M is a schematic plan view of a portion of the ink jetting device shown in Figure 1, with broken lines indicating typical deflection paths for ink droplets, and Figure 3. 1 is a flowchart illustrating a procedure for charging individual ink droplets as they separate from an ink jet column generated by a printing device; Figures 4 and 5A, ZSB and 61st are typical 100-way diagrams for generating charging pressure. 12... Ink jet # generator, 26... Charging *pole. 28...'Kushikai generation' city pole, 30...value, 32...
・Ink between the two, 38. ] ] 0...control device, 40.4].

Claims (1)

Claims: (1) means for directing one or more ink jets toward a recording medium; means for directly charging the charge associated with the droplet trajectory; and generating an electric field in the vicinity of the ink droplet to direct the ink droplet from its initial trajectory to the desired trajectory; and circuitry connected to the upper charging means for determining the appropriate charge for each ink drop and generating a charge associated with said charge. , 161 circuit is an upward charging (means for directing No. 1 in the above direction,
means for causing the ink droplet to follow its desired trajectory by changing the wax as dictated by the actuation temporality of the means for charging and the means for generating the upper fi+-; The ninth means for modifying the ink jet printing apparatus includes means for adding a modulus to the top &' charge signal and for scaling the signal. (2) said circuit generates an initial N-bit digital representation of the optimal charging voltage, and said means for modifying scales said initial N-bit representation to provide a corrected N-bit representation; It includes a circuit for multiplying a coefficient and adding a deviation coefficient, and the profit coefficient and the above deviation coefficient are I
The printing device according to claim 1, which is calculated from the operation of the printing device performed during the IRIE procedure. means for directing the 1 m ink droplet breaking up from said jet or jets to a charge value associated with a desired in-JP drop trajectory; a deflection means for generating an electric field near the ink droplet in order to deflect the ink droplet from its initial orbital force to the desired trajectory; a circuit connected to the -L charging means for generating an associated charging signal, said circuit correcting for misdirection of said ink drop from a desired trajectory of said ink droplet; The method includes means for changing the charging signal in order to perform the above-mentioned charging signal, and the changing means includes means for scaling the initially determined charging signal and adding a correction coefficient to the signal. Ink jet printing device. (4) The circuit generates an N-bit dinotal display of the optimum charging voltage, and the changing means multiplies the N-bit display by a scaling coefficient and adds a deviation coefficient. The gain vk number and the deviation coefficient are calculated from the operation of the steering means observed during the test procedure. (5) The means for orienting comprises multiple noil-in medium sources, and means for providing and changing a printing area covering a particular portion of the recording medium in each of the above-mentioned nozzles. is provided with circuitry for manipulating the gain and deviation coefficient for each of the nozzles, and for directing appropriate charging signals to the means for charging the ink droplets from each of the fills. 4th range of persecution that is equipped with the means of
16) Multiple ink streams for directing multiple ink streams from the printing device toward the recording medium along substantially parallel paths through multiple ink drop charging electrodes and multiple ink dip deflection fields. In the ink jet printing device having a medium and nozzle hole, the wrinkle charging device includes an ink droplet charging device, and has the same number of charging electrodes as the charging electrodes, and is configured to apply a charge IIl electromotive voltage to the charging electrodes. A plurality of voltage amplifiers and a digital charging signal for each ink droplet are connected to both the desired ink drop location on the recording medium and the charging history of other ink droplets directed from the same nozzle. means for monitoring droplet flight during the droplet calibration procedure; and means for monitoring the operating characteristics of the particular droplets sensed by the an ink jet printing apparatus comprising: means for modifying said dizotal charge signal to provide a voltage booster; and means for coupling a suitable corrected charge signal to a suitable voltage amplifier. (7) A noil directs the ink droplet through a uniform deflection electric field, and a voltage amplifier selectively directs the ink droplet both positively and negatively to deflect the ink droplet from its initial trajectory. The printing device according to claim 6, which is electrically charged. +81 Includes multiple ink jets for directing multiple ink streams from the printing device toward the recording medium along substantially parallel paths through multiple bipolar ink electrodes and multiple ink drop deflection fields. Each of the bipolar charging electrodes is capable of charging ink droplets from the associated nozzle so as to impinge on a segment of the recording medium, so that the ink droplets from the multiple ink droplets intertwine with each other and record. In an ink jet printing device adapted to provide a complete printing area covering the media, an in-tube charging device is provided, the scissor charging devices having the same number of charging electrodes and carrying a charge S@voltage. It comprises a plurality of voltage sources to be applied to the charging electrodes, and means for generating a digital charging signal for each inner tube, and the digital charging signal is applied to a desired inner tube on the distribution medium. Means for calibrating printing device operation by relying on both the position and the charge induced on other in-Φ drops directed from the same noil, and further by monitoring the in-tube flight beyond the sensed position. and means for modifying said digital charging signal in response to said means for calibrating to precisely position said medium droplet on said fIk medium; and 1112 means for scaling the upper P digital charging signal by a scaling coefficient.
i! including circuitry for increasing or decreasing said digital charging signal by a factor; and further comprising means for coupling a suitable corrected charging signal to a suitable voltage source to provide a charging voltage. Ink jet printing 1tvr. (9) In an ink jet printing device, a method for charging the droplet in the ink in order to deflect the inn center along a desired trajectory by a uniform electric field when the inn center cylinder is formed, comprising: determining the charge necessary to deflect the upper F-in medium drop from its initial trajectory through the barrel; calculating a charging signal corresponding to the desired charge on each ink portion; R1 the charging signal by a deviation coefficient and/or a scaling coefficient related to the charge sensed in the determining step; converting the modified charging signal into a voltage; Applying a primary voltage to a charging electrode in the vicinity of a droplet formation in an inlet to generate a uniform charge. a step of calculating is performed by the zologram-enabled processing device determining a charging signal by accessing an appropriate address in a look-up table of the processing device, said charging signal determining a deviation factor from said charging signal. 111m in addition to and multiplying the scaling coefficient by the above charging signal.
A method for charging an inner cylinder according to claim 9, which is modified by a circuit. A jet noil and a plurality of rounded charging electrodes, equal in number to said noules, located next to the point of ink droplet breakup and inducing a net charge associated with the desired inlet trajectory on each said inlet center. In order to controllably deflect the charged ink droplets, the ink droplets are connected to an electric cell to generate an electric field that passes through them on the way. and a control circuit connected to said charging Wltii for generating a charging voltage inducing said net charge on said ink portion. In the jet printing device, the control circuit controls a series of prints for the ink droplet ejected by each hole based on the no-print light indication. 7a for memorizing the turns of the no signal, and 7a for generating the first charging signal for each droplet based on the 9 turns of the no signal marked above. and means for generating a second modified charge signal related to the signal of the drug distribution 1 according to the formula V(2nd)=V(1st)m+a [L, In the above F relation, the values of m and a are binary numbers, and further, determining said second modified charging signal for a particular ink drop trajectory and calculating said first modified charging signal for these same specific ink drop trajectories. Charging signal power・lttl of the value of Fm and -
g; and means for converting the second modified charging signal into a charging voltage and transmitting it to an appropriate charging electrode. Ink jet printing device. (2) the means for generating the first charge signal comprises a look-up table within the memory space of the programmable controller for generating an N-pit note; The means for generating the signal comprises an N-pit multiplier/adder for passing the value of m and heat over 2NN bits prior to conversion to a charging voltage. The printing device according to claim 11.