JPH10119290A - Method and apparatus for ink jet recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow one row of dots to be recorded by ink from different recording elements, and suppress a variation of density due to a characteristic variation of recording elements by driving a recording head in accordance with recording data, and controlling a deviation in the direction of ink ejection in accordance with recording positions on the recording medium. SOLUTION: Ink droplets ejected from one ink ejection nozzle 101 provided on an ink jet head are charged in negative or positive electric potential by means of charge electrodes 102. With the application of potential to deflection plates 103 provided opposite with each other, ink droplets charged by the charge electrodes 102 can deviate in a desired direction. Also, a head driver 104 operates to electrification drive a heat resistor 109 of the corresponding nozzle of the recording head to eject ink at predetermined timing in accordance with the inputted recording data, and a deviation controller 105 operates to deviation control the flying path so as to direct the normal flying path 106a of ink droplets as in 106b by the deflection plates 103.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an ink jet recording method and apparatus for performing recording by relatively moving a recording medium and a recording head.

[0002]

2. Description of the Related Art Like a color ink-jet printer, it has a recording head (ink-jet head) on which inks corresponding to respective colors such as Y, M, C and black are mounted. In order to obtain a stable color image, various types of printing devices, such as ink color development, gradation of a recorded color image, and uniformity of a recorded color, are used to obtain a stable color image. Factors matter.

In particular, with regard to color uniformity, slight variations in the shape of each nozzle, which occur in the process of manufacturing a multi-head having a plurality of nozzles, appear as variations in ink ejection characteristics from each nozzle. That is, such variation in each nozzle affects the amount and direction of ink ejection from each nozzle, and these appear as uneven density in the recorded image. As a result, the quality of the recorded image is reduced. Was causing the decrease.

A specific example will be described with reference to FIGS. 10 and 11.

In FIG. 10A, reference numeral 2001 denotes a multi-head having a plurality of nozzles. Here, for the sake of simplicity, an example having eight nozzles 2002 is shown.
2003 indicates ink droplets ejected from each nozzle,
Ideally, with a uniform shape (ejection amount) as shown in this figure,
It is desirable that the ink be ejected in a uniform direction. FIG. 10 (b)
FIG. 4 is a diagram showing a recording example by such uniform ink ejection. In FIG. 10B, as shown, dots having a uniform shape are landed on the paper surface, and as shown in FIG. 10C, a uniform image without density unevenness is obtained as a whole. It is.

However, in actuality, as described above, since the nozzles have variations, if the recording is performed in the same manner as described above, as shown in FIG. The size of the ink droplet to be ejected and the ejection direction of the ink droplet vary. For this reason, as shown in FIG. 11B, ink droplets having different shapes land on shifted positions on the recording paper. According to this figure,
In the main scanning direction (horizontal direction) of the head, there are periodically blank white portions that cannot satisfy the area effector 100%, and conversely, dots overlap more than necessary.
Alternatively, a white streak as shown in the central portion of FIG. The collection of dots landed in such a state is
The density distribution is as shown in FIG. 11C, and as a result, these are perceived by the human eye as density unevenness.

Therefore, as a measure against the density unevenness, there has been proposed a method of printing dots of one line using different nozzles (multi-pass printing).

The method will be described with reference to FIG.

In FIG. 12, the head 2001 is scanned three times to complete the image recording in the recording area shown in FIG. 10 and FIG. Is completed twice. In this case, the eight nozzles of the head 2001
The dots that are divided into two groups, the upper four nozzles and the lower four nozzles, and that are recorded by one nozzle in one scan, thin out prescribed image data by about half according to a predetermined image data array. It is a thing. Then, in the second scan, the remaining half of the dots are embedded to complete recording of an area in units of four pixels. Such a multi-pass printing method is described in, for example, JP-A-5-169681.

[0010]

However, as shown in FIG. 9, a fixed recording head (line head) in which a plurality of nozzles are arranged in a direction perpendicular to the moving direction (sub-scanning direction) of the recording medium is used. In the ink jet printing apparatus having such a configuration, since the print head cannot move in the main scanning direction (the horizontal direction in the drawing), it is impossible to realize multi-pass printing in which one column (dot row) is printed by different nozzles as in the related art. For this reason, there is a problem that it is not possible to solve the density unevenness of the recorded image due to the variation of the ink discharge characteristics of each nozzle.

The present invention has been made in view of the above-mentioned prior art, and deflects the ejection direction of ink droplets ejected from a recording head so that ink ejected from different recording elements (nozzles) of the recording head can be used. It is an object of the present invention to provide an ink jet recording method and an apparatus thereof in which three dot rows are recorded to suppress variations in recording density caused by variations in characteristics of each recording element.

Another object of the present invention is to suppress variations in recording density due to variations in characteristics of the recording head by deflecting the direction of ink ejection from the recording head in accordance with the recording position on the recording medium. It is an object of the present invention to provide an ink jet recording method and an apparatus therefor.

[0013]

In order to achieve the above object, an ink jet recording apparatus according to the present invention has the following arrangement. That is, an ink jet recording apparatus that performs recording by relatively moving a recording medium and a recording head,
A driving unit that drives the recording head in accordance with recording data to eject ink, a deflecting unit that deflects an ejection direction of the ink ejected by driving the driving unit, and a recording unit on the recording medium based on the recording data. And control means for controlling the deflection by the deflection means in accordance with the recording position.

In order to achieve the above object, the ink jet recording method of the present invention comprises the following steps. That is,
An ink jet recording method for performing recording by relatively moving a recording medium and a recording head, wherein a driving step of driving the recording head according to recording data to discharge ink, and a driving step of discharging the ink. A deflecting step of deflecting the ink ejection direction in accordance with the recording position on the recording medium.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a diagram best illustrating the features of the embodiment of the present invention. The direction of flight of ink droplets ejected from a recording (ink-jet) head is varied to change the ink droplets from the same nozzle. FIG. 3 is a diagram showing a basic configuration capable of recording at a position. In the present embodiment, an ink jet printer apparatus that performs recording by forming flying droplets using thermal energy among the ink jet recording methods will be described as an example. However, the present invention is not limited to this.

Reference numeral 101 denotes one ink discharge nozzle provided in the ink jet head. A charging electrode 102 charges an ink droplet ejected from the nozzle 101 to a negative or positive potential. Reference numeral 103 denotes deflecting plates provided to face each other. By applying a potential to these deflecting plates 103, the ink droplets charged by the charging electrodes 102 can be deflected in a desired direction. The deflection plate 103 may be deflected by a magnetic field. Numeral 104 denotes a head driver, which generates the heating resistor 10 of the corresponding nozzle of the print head at a predetermined timing in accordance with the input print data.
9 is energized to eject ink. A deflection control unit 105 controls deflection by the deflection plate 103.
Reference numeral 106 denotes a flight path of the ink droplet, 106a denotes a normal flight path that is not deflected, and 106b denotes a flight path deflected by the deflection plate 103. 107 is a recording medium such as recording paper. Reference numeral 108 denotes ink stored in the nozzle 101. Electrothermal converter (resistor) 1
In 09, heat is generated by energization by the head driver 104, and the ink 108 in the vicinity of the electrothermal converter 109 is heated to expand and discharge ink.

FIGS. 2A and 2B are views for explaining the recording head 201 of the ink jet printer according to the present embodiment. FIG. 2A is a front view of the recording head 201, and FIG. B) shows a top view of the recording head.
In these figures, parts common to FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.

Recording head (ink-jet head) 20
1 has eight nozzles, and a charging electrode 10 is provided on the ink ejection port side of the recording head 201 in the longitudinal direction of the head 201.
2 are arranged. Further, deflection plates 103 are disposed on the left and right sides of the recording head 201 in the longitudinal direction. The recording medium 210 is moved in the direction of arrow F,
The ink droplets are ejected from the respective nozzles of the recording head 201 in accordance with the movement of the recording head 201, whereby the ink droplets are recorded as shown in FIG. In FIG. 2B, reference numeral 204 denotes a row of ink droplets ejected without being deflected, and reference numeral 206 denotes a dot row recorded by these ink drops. Reference numeral 205 denotes the charging electrode 102 and the deflection plate 10
Reference numeral 3 denotes a row of deflected ink droplets, and reference numeral 207 denotes a dot row recorded by the ink drops.

FIG. 3 is a block diagram showing the configuration of the ink jet printer according to the present embodiment. Portions common to the above-described drawings are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 3, reference numeral 301 denotes a control unit for controlling the operation of the ink jet printer of this embodiment.
For example, a CPU 310 such as a microprocessor, a CPU 3
10, a program memory for storing a control program (flow chart in FIG. 4) and various data, and a RAM 3 used as a work area for temporarily storing various data when the CPU 310 executes processing.
12 and the like. A head driver 104 drives the printhead 201, and drives the printhead in accordance with print data output from the control unit 301. 303
Is a driver for turning on / off charging by supplying electricity to the charging electrode 102 according to a control signal from the control unit 301.
Reference numeral 304 denotes a motor driver, which rotationally drives the transport motor 305 according to a drive signal from the control unit 301. The transport motor 305 is a motor for transporting a recording sheet as a recording medium. Reference numeral 306 denotes an input unit which is connected to a host computer via a cable or various workstations via a communication line or a network, and receives and inputs recording data sent thereto.

FIG. 4 is a flowchart showing a print control process in the ink jet printer of the present embodiment. In this case, the print head 20 after the print operation is started.
1 mainly shows processing for performing the control. It should be noted that a control program for executing this processing is stored in the program memory 311 and is executed under the control of the CPU 310.

First, in step S1, it is determined whether or not the next line to be printed (recorded) is an even-numbered line.
In step 2, the driver 303 and the deflection control unit 105 are controlled to stop supplying power to the charging electrode 102 and the deflection plate 103. Then, the process proceeds to step S3, where the image is recorded by driving the recording head 201 via the head driver 303 according to the recording data to eject ink.
This corresponds to a recording operation in a normal printer well known in the related art.

On the other hand, if it is determined in step S1 that printing is to be performed on an odd-numbered row, the process proceeds to step S4. As shown in FIG. 2B, the dot droplets discharged from each nozzle are deflected and printed. The print data to be output to the print head 201 is rearranged (shifted) in consideration of the displacement. Next, in step S5, the charging electrode 102 is energized through the driver 303, and in step S6, the deflection plate 10 is turned on.
3 to turn on the deflection by the deflection plate 103.
Then, the process proceeds to step S7, in which the head driver 104 according to the recording data converted in accordance with the deflection in step S4.
Drives the recording head 201 to eject ink. As a result, as shown by 207 in FIG. 2B, for example, printing is performed using ink from a nozzle different from the nozzle that printed the dot at the same position in the previous line.
Then, the process proceeds to step S8, where it is determined whether there is data to be printed (recorded) next. If there is data to be printed (recorded), the process returns to step S1 to execute the above-described processing.

In the present embodiment, the ink droplets ejected in the odd rows are deflected. However, the present invention is not limited to this. For example, the deflection is performed in the even rows. Alternatively, the processing may be performed at a ratio of one line to a plurality of lines.

Although the present embodiment has been described with reference to a line type recording head, the present invention is not limited to this. For example, a serial scan type recording head can be used. . In this case, the ink droplet may be deflected depending on whether the column is an odd-numbered column or an even-numbered column, or whether it is a recording timing at a column position where the deflection is performed.

[Second Embodiment] Next, a second embodiment of the present invention will be described. In the second embodiment, the recording head is arranged downward on the recording medium, and the recording is performed by ejecting ink droplets downward from the recording head. The configuration of the ink jet printer in this case is substantially the same as that of the first embodiment, and the description thereof will be omitted.

FIGS. 5A and 5B are diagrams showing a recording head and a recording state in the second embodiment.

FIG. 5A shows a head unit 50 including a recording head 502, a charging electrode 503, and a deflecting plate 504.
FIG. 5B is a diagram showing the external shape of the head unit 501 viewed from the recording medium 510 side and an example of recording on the recording medium.

Reference numeral 503 denotes a charging electrode corresponding to the above-mentioned charging electrode 102, and 504 denotes a deflecting plate for generating a magnetic field corresponding to the above-mentioned deflecting plate 103, and is constituted by, for example, an electromagnet. As a result, the ink droplets discharged from the head unit 501 are charged on the charging electrode 503, and the flying direction of the charged ink droplet is deflected by the magnetic field generated by the deflection plate 504.

In the above configuration, as indicated by reference numeral 404, dots recorded by normal ink ejection driving are
Deflection plate 504 arranged in parallel with head unit 501
The magnetic field in the direction substantially perpendicular to the direction of ink droplet ejection by
For example, as shown by 405, the ejection direction of the ink droplet can be deflected. This enables dots to be printed at a plurality of different positions by ink droplets from the same nozzle of the print head 502, as in the first embodiment, and print density unevenness due to variations in the ink ejection characteristics of the nozzles. Can be reduced. Further, by disposing the ink ejection direction downward in this manner, the interval between the recording head and the recording medium can be lengthened, whereby the deflection of the ink droplet can be performed more reliably.

[Third Embodiment] In the third embodiment of the present invention, similarly to the above-described second embodiment, the recording head is disposed downward toward the recording medium, and the ink droplets downward toward the recording medium. Embodiment 3 is the same as that of Embodiment 3.
6 and 7, the head unit 601 is different in that the head unit 601 is arranged at a predetermined angle with respect to the transport direction of the recording medium.

FIG. 6A is a side view of the head unit according to the third embodiment, and FIG. 6B is a diagram showing the external shape of the head unit 501 as viewed from below and an example of recording on a recording medium. is there. Parts common to those in FIG. 5 described above are indicated by the same reference numerals.

On the recording medium 610, reference numeral 504 denotes a landing position of a non-deflected ink droplet, and reference numeral 505 denotes a landing position of a deflected ink droplet. That is, the ejection direction of the ink droplet from each nozzle is indicated by a dotted line, and the ejection direction of the deflected ink droplet is indicated by a solid line.

FIG. 7 is a diagram showing a positional relationship between the head unit 501 and the recording medium 610 in accordance with the relative movement.

FIG. 8 shows a recording medium 7 according to the third embodiment.
FIG. 7 is a diagram for explaining the arrangement of recording dots recorded on a recording medium 707 with the relative movement of a recording unit 707 and a head unit 501 (recording head).

In FIG. 8, reference numeral 501 denotes the above-described head unit, and 703 to 706 denote the recording medium 7 respectively.
07 indicates the relative position of the head unit 501 with respect to the recording medium 707 due to the conveyance in the direction opposite to the arrow 708. Each dot position recorded on the recording medium 707 is numbered, and the number indicates the order in which each dot is recorded. Each of 701 to 704 indicates a dot row recorded on the recording medium 707, and 710 indicates a recordable range on the recording medium 707.

When the head unit 501 is at the position indicated by 704, it corresponds to the position where the dot indicated by "1" is recorded. Also, the head unit 501 is 705
When in the position indicated by, the charging electrode 503 and the deflecting plate 5
The direction of the ink droplet ejected by 04 is deflected in the direction of the arrow, and the dot of “2” indicated by the ink dot row 701 is recorded. Further, when the head unit 501 is at the position indicated by 706, the ink droplet indicated by "3" is recorded without deflecting the direction of the ejected ink droplet. Next, the head unit 5 is moved to a position advanced by one dot.
When 01 arrives, similarly to the case of the position 705, the direction of the ejected ink droplet is deflected to record the ink dot row 703 indicated by "4". Similarly, dots indicated by odd numbers are recorded without deflection, and dots indicated by even numbers are recorded by deflecting the ejection direction of ink droplets.

As described above, according to the third embodiment, by deflecting the directions of the ink droplets ejected in the odd-numbered rows and the plurality of rows, the dots of each dot row of the recording medium are alternately changed from different nozzles. Recording with the above ink droplets has the effect of reducing uneven recording density due to variations in the ink ejection characteristics of each nozzle.

The present invention brings about an excellent effect particularly in a recording head and a recording apparatus utilizing thermal energy among ink jet recording methods.

The typical structure and principle are described in, for example, US Pat. Nos. 4,723,129 and 4,740.
It is preferable to use the basic principle disclosed in the specification of Japanese Patent No. 796. This method can be applied to both the so-called on-demand type and continuous type. In particular, in the case of the on-demand type, liquid (ink)
By applying at least one drive signal corresponding to the recorded information and providing a rapid temperature rise exceeding the nucleate boiling to an electrothermal transducer arranged corresponding to the sheet or the liquid path holding the Then, heat energy is generated in the electrothermal transducer, causing film boiling on the heat acting surface of the recording head. As a result, air bubbles in the liquid (ink) can be formed in one-to-one correspondence with the drive signal. It is valid. The liquid (ink) flows through the ejection opening due to the growth and contraction of this bubble.
To form at least one droplet. If the drive signal is formed into a pulse shape, the growth and shrinkage of the bubbles are performed immediately and appropriately.
Discharge can be achieved, which is more preferable.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. Further, if the conditions described in US Pat. No. 4,313,124 relating to the temperature rise rate of the heat acting surface are adopted, more excellent recording can be performed.

As the configuration of the recording head, in addition to the combination of the discharge port, the liquid path, and the electrothermal converter (linear liquid flow path or right-angle liquid flow path) as disclosed in the above-mentioned respective specifications, A configuration using U.S. Pat. No. 4,558,333 or U.S. Pat. No. 4,459,600, which discloses a configuration in which a heat acting surface is arranged in a bent region, is also included in the present invention. In addition, for multiple electrothermal transducers,
JP-A-59-123670 which discloses a configuration in which a common slot is used as a discharge portion of an electrothermal converter, and JP-A-59-123670 which discloses a configuration in which an opening for absorbing a pressure wave of thermal energy corresponds to a discharge portion. The present invention is also effective as a configuration based on JP-A-138461.

Further, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, the length is determined by combining a plurality of recording heads as disclosed in the above-mentioned specification. This may be either a configuration satisfying the above requirements or a configuration as a single recording head formed integrally.

In addition, the print head is replaceable with a print head of a chip type which can be electrically connected to the main body of the apparatus and can supply ink from the main body of the apparatus, or is integrated with the print head itself. Alternatively, a cartridge type recording head provided with an ink tank may be used.

It is preferable to add recovery means for the recording head, preliminary auxiliary means, and the like provided as components of the recording apparatus of the present invention since the effects of the present invention can be further stabilized. . If these are specifically mentioned, capping means for the recording head, cleaning means, pressurizing or suction means, preheating means using an electrothermal transducer or another heating element or a combination thereof, and printing Performing a preliminary ejection mode for performing another ejection is also effective for performing stable printing.

Further, the recording mode of the recording apparatus is not limited to the recording mode of only the mainstream color such as black, and the recording head may be integrally formed or a combination of a plurality of recording heads. Alternatively, the apparatus may be provided with at least one of full colors by color mixture.

In the embodiments of the present invention described above, the ink is described as a liquid. However, an ink which solidifies at room temperature or lower, or an ink which softens or liquefies at room temperature may be used. In general, in the ink jet system, the temperature of the ink itself is controlled within a range of 30 ° C. or more and 70 ° C. or less to control the temperature so that the viscosity of the ink is in a stable ejection range. It is sufficient if the ink is in a liquid state.

In addition, in order to positively prevent the temperature rise due to thermal energy as energy for changing the state of the ink from the solid state to the liquid state, the temperature is positively prevented.
Alternatively, in order to prevent evaporation of the ink, an ink which solidifies in a standing state and liquefies by heating may be used. In any case, the application of heat energy causes the ink to be liquefied by application of the heat energy according to the recording signal and the liquid ink to be ejected, or to start to solidify when reaching the recording medium. The present invention is also applicable to a case where an ink having a property of liquefying for the first time is used. In such a case, as described in JP-A-54-56847 or JP-A-60-71260, the ink is held in a liquid state or a solid state in the concave portion or through hole of the porous sheet. It is good also as a form which opposes an electrothermal transducer. In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

In addition to the above, the recording apparatus according to the present invention may be provided not only as an image output terminal of an information processing apparatus such as a computer but also integrally or separately, a copying apparatus combined with a reader or the like, and a transmission / reception apparatus. It may take the form of a facsimile machine having functions.

Even if the present invention is applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), an apparatus (for example, a copying machine, a facsimile, etc.) Device).

Further, an object of the present invention is to provide a storage medium storing a program code of software for realizing the functions of the above-described embodiments to a system or an apparatus, and to provide a computer (or CPU) of the system or apparatus.
Or MPU) reads and executes the program code stored in the storage medium.

In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

As a storage medium for supplying the program code, for example, a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD
-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

When the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS (Operating System) running on the computer based on the instructions of the program code. ) Performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, based on the instructions of the program code, The case where the CPU of the function expansion board or the function expansion unit performs part or all of the actual processing, and the function of the above-described embodiment is realized by the processing.

In the above-described second and third embodiments, the case of a line type recording head has been described. However, the present invention is not limited to this. Can be realized. In this case, the ink droplet may be deflected depending on whether the column is an odd-numbered column or an even-numbered column, or whether it is a recording timing at a column position where the deflection is performed.

In the above-described embodiment, the charging electrode for charging the ink droplet ejected from the nozzle to a positive or negative charge is provided, but the ink itself has a negative or positive charge in advance. If necessary, the charging electrode may be omitted.

As described above, according to the present embodiment, when recording is performed by a recording head arranged substantially perpendicular to the moving direction of the recording medium or at a predetermined angle, the line or the line to be recorded is recorded. By deflecting the ink ejection direction according to the columns and the like for recording, each dot row or row is recorded by ink droplets from different nozzles.

As a result, it is possible to reduce the unevenness of the recording density due to the variation of the ink ejection characteristics of each nozzle of the recording head, and it is possible to obtain a high quality image without the unevenness of the density.

[0061]

As described above, according to the present invention, different recording elements (nozzles) of the recording head are provided by deflecting the ejection direction of ink droplets ejected from the recording head.
One dot row is printed by the ink ejected from the printer, thereby suppressing the variation in the recording density due to the variation in the characteristics of each printing element.

Further, according to the present invention, by deflecting the direction of ink ejection from the recording head in accordance with the recording position on the recording medium, it is possible to suppress variations in recording density due to variations in characteristics of the recording head. There is an effect that can be.

[0063]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating deflection of ink droplets in an inkjet printer according to an embodiment of the present invention.

FIGS. 2A and 2B are a front view of the recording head according to the first embodiment of the present invention and a diagram illustrating ink jet printing.

FIG. 3 is a block diagram illustrating a configuration of an inkjet printer device according to the present embodiment.

FIG. 4 is a flowchart showing a recording process in the ink jet printer of the embodiment.

FIG. 5A is a front view of a recording head according to a second embodiment of the present invention, and FIG. 5B is a diagram illustrating ink-jet printing.

FIG. 6A is a front view of a recording head according to a third embodiment of the present invention, and FIG. 6B is a diagram illustrating inkjet printing.

FIG. 7 is a diagram illustrating a positional relationship between a recording head and a recording medium according to a third embodiment of the present invention.

FIG. 8 is a diagram illustrating a recording order of dots on a recording medium according to a third embodiment.

FIG. 9 is a diagram illustrating recording density unevenness caused by variations in ink ejection characteristics of each nozzle of an inkjet head.

FIG. 10 is a diagram illustrating a recording example using an ideal inkjet head.

FIG. 11 is a diagram illustrating an example of recording density unevenness when each nozzle has different ink ejection characteristics.

FIG. 12 is a diagram illustrating an example in which density unevenness is reduced by multi-pass printing.

[Explanation of symbols]

 101 Nozzle 102, 503 Charging electrode 103, 504 Deflection plate 201 Recording head 301 Control unit

Claims (14)

[Claims] 1. An ink jet recording apparatus which performs recording by relatively moving a recording medium and a recording head, wherein the driving unit drives the recording head in accordance with recording data to discharge ink, and Deflecting means for deflecting the ejection direction of ink ejected by driving the means, control means for controlling deflection by the deflecting means in accordance with a recording position on the recording medium based on the recording data,
An ink jet recording apparatus comprising: 2. The ink jet recording apparatus according to claim 1, wherein said deflecting unit has a charging unit for charging ink ejected from said recording head. 3. The ink jet recording apparatus according to claim 1, wherein the deflecting unit includes a magnetic field generating unit that applies a magnetic field to the charged ink. 4. The ink jet recording apparatus according to claim 1, wherein the control unit switches the deflection by the deflecting unit depending on whether the recording row is an odd row or a plurality of rows. 5. The ink jet recording apparatus according to claim 1, wherein said recording head is a fixed line head. 6. The ink jet recording apparatus according to claim 1, wherein the recording head is a fixed line head disposed at a predetermined angle with respect to the recording medium. 7. The recording head according to claim 1, wherein the recording head ejects ink using thermal energy, and includes a thermal energy converter for generating thermal energy applied to the ink. Item 7. The ink jet recording apparatus according to any one of Items 1 to 6. 8. An ink jet recording method for performing recording by relatively moving a recording medium and a recording head, comprising: a driving step of driving the recording head in accordance with recording data to eject ink; A deflecting step of deflecting an ejection direction of the ink ejected in the step according to a recording position on the recording medium. 9. The ink jet recording method according to claim 8, wherein the deflecting step includes a charging step of charging ink ejected from the recording head. 10. The ink jet recording method according to claim 8, wherein in the deflecting step, a discharge direction of the ink is deflected by applying a magnetic field to the charged ink. 11. The ink jet recording method according to claim 8, wherein in the deflecting step, the deflection is switched according to whether the recording row is an odd row or a plurality of rows. 12. The ink jet recording method according to claim 8, wherein the recording head is a fixed type line head. 13. The ink jet recording method according to claim 8, wherein the recording head is a fixed line head disposed at a predetermined angle with respect to the recording medium. 14. The recording head according to claim 1, wherein the recording head ejects ink by using thermal energy, and includes a thermal energy converter for generating thermal energy to be applied to the ink. Item 14. The inkjet recording method according to any one of Items 8 to 13.