JP6045206B2 - Inkjet recording method and inkjet recording apparatus - Google Patents

Description

  The present invention relates to an ink jet recording method and an ink jet recording apparatus provided with a recording head having a plurality of ejection port arrays formed of a plurality of ejection ports along a conveyance direction of a recording medium.

  In an ink jet recording apparatus having a recording head having a plurality of ejection port arrays composed of a plurality of ejection ports along the conveyance direction of the recording medium, when recording black ink and color ink at the same or adjacent positions, Color unevenness and ink bleeding may occur. In order to prevent this, a method of recording an image recorded with black ink (black image) and an image recorded with color ink (color image) by different scanning is known.

  Patent Document 1 discloses a method of adjusting the ejection timing of black ink and color ink when a black image and a color image are recorded at the same or adjacent positions.

JP 2002-254612 A

  By the way, even if a black image and a color image arranged in the main scanning direction are not located at the same position or close enough to contact each other (hereinafter referred to as “contact area”), Even if a color image is recorded by the same scanning, the above-described adverse effects are unlikely to occur.

  However, in the conventional configuration, even in such a case, the black image and the color image are recorded by separate scanning, so that all the ejection ports cannot be used effectively, and output takes time. I was doing.

  Further, Patent Document 1 discloses that the timing for recording these inks is adjusted in accordance with the relative positions of the black image and the color image. There is no portion where the row and the color ejection port row overlap in the scanning direction. Therefore, no matter how the timing is adjusted, the black image and the color image are not recorded in the same scan. That is, even when the black ink and the color ink are not recorded in the contact area, the black image and the color image are recorded by different scanning, and much time is required for output.

  The present invention has been made in view of the above problems. An object of the present invention is to provide an ink jet recording method and an ink jet recording apparatus that perform efficient recording scanning while preventing deterioration in recording quality.

In order to solve the above-described problems, an inkjet recording method according to the present invention includes a first ejection port array in which ejection ports that eject the first ink that is black ink are arranged in the conveyance direction of the recording medium, and a color At least one second ejection port array in which ejection ports for ejecting second ink, which is ink, are arranged in the conveyance direction of the recording medium, respectively, and the first ejection port array from the second ejection port array also arranged to be positioned on the upstream side in the transport direction, of a portion of the discharge port for configuring the second ejection port array and part of the discharge port of the discharge ports constituting the first outlet row A recording head in which the ejection ports overlap in the scanning direction intersecting the transport direction , and the other part of the first ejection port array and the other part of the second ejection port array are arranged so as not to overlap each other. and by scanning in the scanning direction An inkjet recording method for recording an image comprising a second image recorded by the more the second ink and the first image recorded by the first ink on the recording medium, the conveyance amount of the recording medium is conveyed the area on the recording medium capable of recording said recording head in response to, whether in the scanning direction as the first ink and the second ink is contacted region may contact each other on the recording medium When it is determined that there is the contact area in the first determination step and the first determination step, the use range of the first discharge port row is determined as the second discharge port in the first discharge port row. switch to the portion of the discharge port overlapping the column, when it is determined that there is no said contact region in said first determination step, the range of use of the first ejection opening array of said first outlet row Switch to the whole Whether there is an unrecorded portion of the first image on a line on the recording medium corresponding to the most downstream ejection port in the transport direction among the ejection ports in the usage range of the first ejection port array. Whether or not there is an unrecorded portion of the second image on the line on the recording medium corresponding to the most downstream ejection port in the transport direction among the ejection ports of the second ejection port array. A second determination step of determining whether or not, and it is determined in the second determination step that either or both of an unrecorded portion of the first image and an unrecorded portion of the second image are present, The recording medium is conveyed by a conveyance amount, and an unrecorded portion of the image is recorded using the ejection ports in the usage range of the first ejection port array and the entire second ejection port array. Control the unrecorded portion of the first image and the previous image in the second determination step. When it is determined that there is no unrecorded portion of the second image, the transport amount is increased by one line of the recording medium, and the first determination step and the second determination step are performed again. And a control step of controlling to perform .

  According to the above configuration, some of the ejection ports constituting the first ejection port array and some of the ejection ports constituting the second ejection port array overlap in the scanning direction. Are arranged as follows. By appropriately using whether or not to use the discharge ports arranged so as to overlap, when the first image and the second image are not recorded in the contact area, both images are recorded in the same scan, When recorded in the contact area, both images can be recorded by different scans.

  In other words, when the first image and the second image are recorded in the contact area, the color unevenness that may occur when both images are recorded in the same scan by recording both images in different scans. And ink bleeding can be prevented. On the other hand, when the first image and the second image are not recorded in the contact area, all the ejection ports can be used effectively by recording both images in the same scan. In addition, there is no wasteful time for output. Therefore, according to the present invention, efficient print scanning can be performed while preventing a drop in print quality.

It is a schematic perspective view which shows the inkjet recording device in embodiment. It is a schematic diagram showing a recording head in the embodiment. It is a block diagram which shows the control structure of an inkjet recording device. (A)-(c) is a figure explaining the recording method recorded on a contact area. (A)-(c) is a figure explaining the recording method which is not recorded on a contact area. (A) And (b) is a figure for demonstrating recording operation | movement.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment)
FIG. 1 is a schematic perspective view showing an ink jet recording apparatus 10 (hereinafter referred to as “recording apparatus 10”) in the present embodiment. As shown in the figure, the recording apparatus 10 includes a recording unit 4 and various rollers 5 to 7. The recording unit 4 includes an ink tank 1, a recording head 2, and a carriage 3. The recording unit 4 has the ink tank 1 mounted on the carriage 3.

  In the present embodiment, the ink tank 1 is composed of four ink tanks each containing black (Bk), cyan (C), magenta (M), and yellow (Y) ink. The ink tank 1 supplies ink to the recording head 2. As will be described in detail later, the recording head 2 has a plurality of ejection port arrays composed of a plurality of ejection ports. The recording apparatus 10 records an image on the recording medium 8 by ejecting ink from an ejection port provided on the surface of the recording head 2 facing the recording medium 8.

In the present embodiment, Ka value by the Bristow method of the black ink and color ink, black ink ^{1.0ml / (m 2 · msec 1/2} ), the color ink is 7.0ml ^/ (m 2 · msec ^{1 / 2} ). The color ink has a higher Ka value than the black ink.

  Therefore, the penetration speed of color ink is faster than that of black ink, and the penetration speed of black ink is slower than that of color ink. Therefore, even if color inks with a high penetration speed are recorded at positions adjacent to each other, the ink does not bleed on the recording medium, but if the color ink comes into contact with the black ink with a low penetration speed, the black ink There is a tendency to ooze into the color ink area.

  The paper feed roller pair 5 supplies the recording medium 8 to the recording unit 4 by rotating in the direction of the arrow shown on the side surface of the paper feed roller pair 5 in the figure while supporting the recording medium 8 therebetween. The paper feed roller 6 and the auxiliary roller 7 support the recording medium 8 therebetween, and rotate in the direction of the arrow shown on the side surface of the paper feed roller 6 and the auxiliary roller 7 in the figure to thereby convey the direction (in the figure). The recording medium 8 is conveyed in the Y direction shown.

  A recording scan for ejecting ink while reciprocating the recording unit 4 in the main scanning direction (X direction shown in the figure), and a sub-scanning direction (Y direction shown in the figure) intersecting the X direction by various rollers 5-7. The recording apparatus 10 records on the recording medium 8 by repeating the operation of transporting the recording medium 8 to the recording medium 8. In the present embodiment, the scanning direction refers to the reciprocating direction of the recording unit 4, that is, the X direction shown in the drawing.

  A home position H indicated by a broken line in FIG. 1 is a standby position of the recording unit 4. The recording unit 4 is located at the home position H when recording on the recording medium 8 is not performed before starting recording or when the recovery operation of the recording head 2 is performed. Before the recording start command, the recording unit 4 is waiting at the home position H. When receiving the recording start command, the recording unit 4 reciprocates in the X direction, and ejects ink from the ejection port provided in the recording head 2. An image is recorded on the recording medium 8.

  FIG. 2 is a schematic diagram showing the configuration of the recording head 2 in the present embodiment. 2, 4, 5, and 6 (b) shows a state in which the recording head 2 is seen through from the ink tank 1 side.

  As shown in FIG. 2, the recording head 2 is provided with a plurality of ejection openings. The recording head 2 has a color ejection port array 201 (second ejection port array) composed of a plurality of ejection ports that eject color ink (second ink) and a plurality of ejections that eject black ink (first ink). A black discharge port array 202 (first discharge port array) configured from the outlet is provided. The plurality of discharge ports are arranged along the Y direction to form discharge port arrays.

  The color discharge port array 201 is composed of three discharge port arrays, a cyan (C) discharge port array, a magenta (M) discharge port array, and a yellow (Y) discharge port array. They are arranged along the direction, and these are arranged substantially in parallel. Further, the black discharge port array 202 is also disposed along the Y direction, and is disposed substantially parallel to the color discharge port array 201. Note that the color ejection port array in the present invention does not necessarily need to be configured from the above-described three ejection port arrays, and may be less than 3, more than 4, and at least one. .

  Further, each of the ejection port arrays constituting the color ejection port array 201 is composed of 10 ejection ports. On the other hand, the discharge port array constituting the black discharge port array 202 is composed of 14 discharge ports. Four of the three ejection port arrays of the color ejection port array 201 (hereinafter referred to as “color ejection ports 206”) and four of the ejection ports of the black ejection port array 202 The discharge ports (hereinafter referred to as “black discharge ports 204”) are arranged substantially on the same line in the X direction. A region where the black discharge port 204 and the color discharge port 206 are located, that is, a region where these discharge ports overlap in the X direction is referred to as a region 203.

  Colors that are six discharge ports other than the black discharge ports 205 that are the ten discharge ports other than the black discharge ports 204 of the black discharge port array 202 and the color discharge ports 206 that form the color discharge port array 201. The discharge port 207 is not arranged on the same line in the X direction.

  In the present invention, the number of discharge ports is not necessarily limited to the above number. Further, the number of discharge ports arranged in the region 203 is not limited to the above number. Each of the three ejection port arrays constituting the color ejection port array 201 has one or more ejection ports and one ejection port of the black ejection port array 202 to form each ejection port array. It suffices that the number of the ejection ports is not the number of all the ejection ports to be arranged in the region 203.

  In this embodiment, when the recording head 2 is configured as described above, when the black image (first image) and the color image (second image) are recorded in the contact area, the recording head 2 is positioned in the area 203. An image is recorded without using the black discharge port 204 and the color discharge port 206 at the same time. On the other hand, when the black image and the color image are not recorded in the contact area, the image is recorded while including the scanning using the black ejection port 204 and the color ejection port 206 where the region 203 is located at the same time. Details of the recording method in this embodiment will be described later.

  Next, the control configuration in the present embodiment will be described. FIG. 3 is a block diagram showing a control configuration of the recording apparatus 10. The recording apparatus 10 includes a CPU 101, a ROM 102, a RAM 103, a CR control unit 104, an LF control unit 105, a head control unit 106, a recording control unit 107, a data analysis unit 108, a recording buffer control unit 109, and a host I / F unit 110. . These are connected by a system bus 111.

  The ROM 102 stores a control procedure program. The CPU 101 controls the entire recording apparatus 10 according to this control procedure program. The RAM 103 is used as a work area of the CPU 101 and a memory area for storing data received by the host I / F unit 110. The CR control unit 104 performs motor drive control for driving the carriage 3. The LF control unit 105 controls driving of the conveyance motor for the recording medium 8.

  The head controller 106 controls the recording head 2. The recording head 2 is equipped with wiring for discharging, a temperature sensor, a heater for adjusting temperature, and the like. The head controller 106 also plays a role of adjusting the recording head 2 to an appropriate temperature by controlling the heater according to the temperature obtained from the temperature sensor.

  The recording control unit 107 issues a control command necessary for recording to the CR control unit 104, the LF control unit 105, and the head control unit 106 based on the recording data sent from each control unit. The host I / F unit 110 receives data input from a host computer or the like. The data analysis unit 108 analyzes the data received by the host I / F unit 110 and transfers the data to the recording control unit 107 or the recording buffer control unit 109. The recording buffer control unit 109 controls the size and quantity of the memory area for storing the recording data in the RAM 103 from the data analyzed by the data analysis unit 108.

  A recording method in the present embodiment will be described. 4A to 4C are diagrams for explaining a recording method when a black image and a color image are recorded in a contact area. 4A to 4C show a process of recording an image on the recording medium 8 in the order of FIGS. 4A to 4C. When a black image and a color image are recorded in the contact area, if the black image and the color image are recorded in one scan, color unevenness may occur or ink may be blurred. In order to prevent this, in the present embodiment, the black image and the color image are recorded by different scanning.

  In the present embodiment, as shown in FIGS. 4A to 4C, a color image is recorded after a black image is recorded.

  As shown in FIG. 4A, only the black image is recorded in the first scan. At this time, considering that a color image is recorded in the contact area in the next scanning, an area 401 that is an area that can be recorded when all (10) color ejection openings are used is designated as a black ejection opening. 205 for recording. Then, the recording medium 8 is conveyed in the Y direction by 10 ejection openings. In the next scanning, as shown in FIG. 4B, an image is recorded in the region 401 using all the color ejection openings. In this scanning, an image is recorded in the region 402 using the black discharge port 205.

  Similarly to the above, the recording medium 8 is conveyed in the Y direction by 10 ejection openings. In the subsequent scanning, as shown in FIG. 4C, an image is recorded in the area 402 using all the color ejection openings. In this scanning, an image is recorded in the region 403 using the black discharge port 205.

  By repeating such recording scanning and recording medium conveyance, in the present embodiment, when recording a black image and a color image in the contact area, both images can be recorded by different scanning. By doing so, it is possible to prevent color unevenness and ink bleeding due to contact between the black ink and the color ink having different penetration speeds in the recording medium 8.

  FIGS. 5A to 5C are diagrams for explaining a recording method when a black image and a color image are not recorded in the contact area. 5A to 5C show a process in which an image is recorded on the recording medium 8 in the order of FIGS. 5A to 5C. When the black image and the color image are not recorded in the contact area, the black discharge port 204 and the color discharge port 206 located in the region 203 are used in the same scan. By doing so, a black image and a color image can be recorded in one scan.

  As shown in FIG. 5A, when the black image and the color image are not recorded in the contact area, all the black discharge ports are used. In this scanning, the color discharge port 206 is also used. Therefore, in this scanning, an image is recorded in the region 501 using the black discharge port 204 and the color discharge port 206 located in the region 203. As described above, this embodiment can record a black image and a color image in one scan using both the black discharge port 204 and the color discharge port 206 located in the region 203. In this scan, an image is recorded in the area 502 using the black discharge port 205.

  After this scanning, the recording medium 8 is conveyed in the Y direction by 10 ejection openings. In the next scanning, as shown in FIG. 5B, an image is recorded in the area 502 using all the color ejection openings. In this scanning, an image is recorded in the region 503 using the black discharge port 205. In the same manner as described above, the recording medium 8 is conveyed in the Y direction by 10 ejection openings. In the next scanning, as shown in FIG. 5C, an image is recorded in the region 503 using all the color ejection openings. In this scanning, an image is recorded in the region 504 using the black discharge port 205.

  In the recording method of FIGS. 5A to 5C, recording is preceded by the area 501 compared to FIGS. 4A to 4C.

  Next, operations from when the recording data is input to the recording apparatus 10 until the recording apparatus 10 starts recording will be described. 6A and 6B are diagrams for explaining the recording operation. FIG. 4A is a flowchart for explaining a recording operation executed by the CPU 101. FIG. 2B is a diagram showing the configuration of the ejection ports of the recording head 2.

  When this process is started, the CPU 101 receives data transmitted from a host computer or the like at the host I / F unit 110 of the recording apparatus 10. The received data is stored in the RAM 103. After that, the CPU 101 uses the recording control unit 107 to analyze the received data for one band that can be recorded by one recording scan among the data stored in the RAM 103, and whether the received data is the recording data. It is determined whether or not (S501). That is, the CPU 101 determines whether or not a pixel to be recorded is included in S501.

  If the received data is not recorded data, the received data for the next band stored in the RAM 103 is analyzed. On the other hand, if the received data is recording data, the recording control unit 107 is used to detect whether or not there is a contact area portion between the black image and the color image (S502).

  As this detection method, for example, dot count (measurement of the number of dots) can be used. In this method, the number of dots of each ink in the recording data in the predetermined recording area in the scanning direction is measured for each ink from the recording data, and both the black ink dots and the color ink dots are counted. Is a method of extracting.

  Based on the result obtained by the detection, the CPU 101 determines whether or not the black image and the color image are recorded in the contact area using the recording control unit 107 (S503 / determination step / determination unit).

  In the present embodiment, the contact area is a position where a black image is recorded and a position where a color image is recorded, or a position close enough to contact each other, and includes both of these positions. Area. Whether the black image and the color image are recorded in the contact area is obtained by acquiring the type of the recording medium 8 and other information in addition to the ink application amount in the predetermined area obtained from the result of the dot count described above. It can be determined from these results.

  If it is recorded in the contact area, the process proceeds to S504. On the other hand, if not recorded in the contact area, if only the black image is recorded, and if only the color image is recorded, the process proceeds to S507.

  When the black image and the color image are recorded in the contact area, the CPU 101 uses the recording control unit 107 to determine whether or not an unrecorded color image exists at the position of the line L1 shown in FIG. Detect (S504). Further, the CPU 101 detects whether or not an unrecorded black image exists at the position of the line L3 shown in FIG. 6B using the recording control unit 107 (S505). Then, the CPU 101 determines whether or not an unrecorded portion has been detected in either S504 or S505 using the recording control unit 107 (S506).

  When an unrecorded portion is detected, recording is performed using the corresponding discharge port (S510). When an unrecorded portion is detected, the image is recorded without reading any more recorded data in order to prevent the generation of unrecorded recording data due to the fact that the processing of the recorded data cannot catch up. On the other hand, when an unrecorded part is not detected (S506), the process returns to S501 and the received data for the next line is analyzed.

  The recording operation in FIG. 4A is an operation performed when it is detected in S505 that there is an unrecorded portion of the black image on the line L3. The recording operations in FIGS. 4B and 4C are performed when it is detected in S504 that there is an unrecorded portion of the color image on the line L1.

  When the black image and the color image are not recorded in the contact area and when only one of the images is recorded, it is determined whether or not an unrecorded color image exists at the position of the line L1 in FIG. The CPU 101 detects using the recording control unit 107 (S507). Further, the CPU 101 detects whether or not an unrecorded black image exists at the position of the line L2 shown in FIG. 6B using the recording control unit 107 (S508).

  Then, the CPU 101 determines whether or not an unrecorded portion has been detected in either S507 or S508 using the recording control unit 107 (S509). When an unrecorded portion is detected, recording is performed using the corresponding discharge port (S510). On the other hand, when an unrecorded portion is not detected (S509), the process returns to S501 and the received data for the next line is analyzed.

  The recording operation shown in FIG. 5A is an operation performed when it is detected in S508 that there is an unrecorded portion of the black image at the position of the line L2. The recording operation shown in FIGS. 5B and 5C is an operation when it is detected in S507 that there is an unrecorded portion of the color image at the position of the line L1.

  The above processing is realized by the CPU 101 executing a control procedure program stored in the ROM 102.

  In the present embodiment, the ejection port for ejecting black ink and the ejection port for ejecting color ink are arranged so that a part thereof overlaps in the scanning direction. Thus, depending on whether the black image and the color image are recorded in the contact area, scanning using the overlapping discharge ports in the scanning direction and scanning not using the overlapping discharge ports can be appropriately selected.

  That is, according to the present embodiment, when the black image and the color image are recorded in the contact area, the color unevenness due to the ink characteristics is reduced by recording the image without using the overlapping ejection openings in the scanning direction. An image can be recorded without causing ink bleeding. On the other hand, when the black image and the color image are not recorded in the contact area, both images can be recorded in one scan by recording the image using the ejection ports that overlap in the scanning direction. Therefore, the number of scans can be reduced as compared with the conventional configuration. Therefore, in the present embodiment, efficient print scanning can be performed while preventing a drop in print quality.

(Other embodiments)
In the above-described embodiment, the processing in the case where the reception data is recording data in band units has been described. Therefore, contact detection between a black image and a color image is detected for each band. However, the detection method in the present invention is not limited to a method for detecting whether a black image and a color image are in contact with each band. For example, when the received data is in units of pages, when the received data is analyzed by the recording control unit 107, the entire page is detected in advance, and the black image and the color image are recorded in the contact area. If it is, turn on the flag of the line where the part is located.

  Then, the same effect as that of the above-described embodiment is achieved by switching on / off of the flag in the printing process and switching prohibition / permission of simultaneous use of the black ejection port 204 and the color ejection port 206 located in the overlapping portion in the scanning direction. Can be obtained.

  Even if the present invention is applied to a system constituted by a plurality of devices (for example, a computer, an interface device, a reading device, and a printer), the present invention is applied to an apparatus (for example, a printer, a facsimile device, etc.) composed of a single device May be.

  The present invention supplies a storage medium storing software program codes for realizing the functions of the above embodiments to a system or apparatus, and a computer (or CPU or MPU) of the system or apparatus stores the program stored in the storage medium. The code may be read and executed. In this case, the program code itself read from the storage medium realizes the functions of the above embodiment. Therefore, the storage medium storing this program code also belongs to the scope of the present invention.

  The functions of the above-described embodiments can also be realized by performing part or all of the processing by the computer operating system (OS) based on the instruction of the program code.

  The same applies to the case where the program code read from the storage medium is written in a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer. In this case, the functions of the above-described embodiments are realized by performing part or all of the actual processing by the CPU or the like provided in the function expansion card or function expansion unit based on the instruction of the written program code. Is done.

  When the present invention is applied to a storage medium, the program code corresponding to the above-described flowchart (FIG. 6A) is stored in the storage medium.

  In the above embodiments, “recording” is not limited to the case of forming characters, figures, etc., and it is widely used for recording media regardless of whether or not it is manifested so that humans can perceive it visually. Forming an image, a pattern, a pattern, or the like, or processing a medium.

  The “recording medium” means not only paper used in a general recording apparatus but also a medium that can accept ink widely.

  The “ink” is applied to the recording medium to form an image, process the recording medium, and process the ink (for example, solidification or insolubilization of the colorant contained in the ink applied to the recording medium). A liquid that can be used.

2 recording head 8 recording medium 10 recording apparatus 201 color discharge port array 202 black discharge port array 203 region 204 black discharge port 205 black discharge port 206 color discharge port 207 color discharge port

Claims (10)

A first ejection port array in which ejection ports for ejecting first ink, which is black ink, are arranged in the conveyance direction of the recording medium, and an ejection port for ejecting second ink, which is color ink, is the conveyance direction of the recording medium. the second ejection port array and the respective at least one row that is constructed by arranging, the first ejection port array than the second ejection port array is arranged to be positioned upstream of the conveying direction, said first A part of the discharge ports constituting the one discharge port row and a part of the discharge ports constituting the second discharge port row overlap in the scanning direction intersecting the transport direction , The other part of the first ejection port array and the other part of the second ejection port array are recorded by the first ink by scanning in the scanning direction with a recording head arranged so as not to overlap each other. By the first image and the second ink. An inkjet recording method for recording an image including the second image to be recorded on the recording medium,
Wherein in an area on the recording medium capable of recording said recording head in accordance with the conveyance amount of recording medium is conveyed, and the second ink and the first ink is in contact with each other on the recording medium in the scanning direction a first determination step of determining whether there is ur contact area,
When it is determined in the first determination step that the contact area is present, the part of the first discharge port array that overlaps the second discharge port array in the use range of the first discharge port array switch to the discharge port, when it is determined that there is no said contact region in said first determination step, switching the range of use of the first ejection opening array to the whole of the first ejection port array, switched the Whether or not an unrecorded portion of the first image exists in a line on the recording medium corresponding to the most downstream ejection port in the transport direction among the ejection ports in the usage range of the first ejection port array. Whether or not there is an unrecorded portion of the second image in a line on the recording medium corresponding to the most downstream ejection port in the transport direction among the ejection ports of the second ejection port array. A second determination step of determining
When it is determined in the second determination step that one or both of the unrecorded portion of the first image and the unrecorded portion of the second image are present, the recording medium is transported by the transport amount, Control is performed so as to record an unrecorded portion of the image using the ejection ports within the usage range of the first ejection port array and the entire second ejection port array, and the second determination step When it is determined that neither the unrecorded portion of the first image nor the unrecorded portion of the second image exists, the conveyance amount is increased by one line of the recording medium, and the first determination step And a control process for controlling to perform the second determination process again;
The ink jet recording method, which comprises a.   In the control step, after the unrecorded portion of the image is recorded, the transport amount of the recording medium to be transported next is not overlapped with the second ejection port array in the first ejection port array. 2. The ink jet recording method according to claim 1, wherein an amount corresponding to the length of the portion is set and control is performed so that the first determination step and the second determination step are further performed. In the first determination step, information on an ink application amount in each predetermined region of the first ink and the second ink is acquired, and it is determined whether or not there is the contact region based on the information. The inkjet recording method according to claim 1 or 2 .   4. The ink jet recording method according to claim 1, wherein the second ink has a higher Ka value by the Bristow method than the first ink. 5.   5. The inkjet recording method according to claim 1, wherein the second ejection port array includes a plurality of ejection port arrays. 6. A first ejection port array in which ejection ports for ejecting first ink, which is black ink, are arranged in the conveyance direction of the recording medium, and an ejection port for ejecting second ink, which is color ink, is the conveyance direction of the recording medium. the second ejection port array and the respective at least one row that is constructed by arranging, the first ejection port array than the second ejection port array is arranged to be positioned upstream of the conveying direction, said first A part of the discharge ports constituting the one discharge port row and a part of the discharge ports constituting the second discharge port row overlap in the scanning direction intersecting the transport direction , The other part of the first ejection port array and the other part of the second ejection port array are recorded by the first ink by scanning in the scanning direction with a recording head arranged so as not to overlap each other. By the first image and the second ink. An inkjet recording apparatus for recording an image comprising a second image to be recorded on the recording medium,
Wherein in an area on the recording medium capable of recording said recording head in accordance with the conveyance amount of recording medium is conveyed, and the second ink and the first ink is in contact with each other on the recording medium in the scanning direction a first determining means for determining whether or not there is ur contact area,
When the first determination unit determines that the contact area is present, the part of the first discharge port array that overlaps the second discharge port array in the usage range of the first discharge port array switch to the discharge port, if it is determined that there is no said contact region in said first determination means, switches the range of use of the first ejection opening array to the whole of the first ejection port array, switched the Whether or not an unrecorded portion of the first image exists in a line on the recording medium corresponding to the most downstream ejection port in the transport direction among the ejection ports in the usage range of the first ejection port array. Whether or not there is an unrecorded portion of the second image in a line on the recording medium corresponding to the most downstream ejection port in the transport direction among the ejection ports of the second ejection port array. Second determination means for determining
When it is determined by the second determination means that either one or both of the unrecorded portion of the first image and the unrecorded portion of the second image exist, the recording medium is transported by the transport amount, Control is performed so as to record an unrecorded portion of the image using the ejection ports within the usage range of the first ejection port array and the whole of the second ejection port array, and the second determination unit performs the control. When it is determined that neither the unrecorded portion of the first image nor the unrecorded portion of the second image exists, the transport amount is increased by one line of the recording medium, and the first determining means Control means for performing control so as to perform determination by the second determination means and switching and determination by the second determination means again;
An ink jet recording apparatus comprising:   The control means sets the transport amount to which the recording medium is transported next after the unrecorded portion of the image is recorded, and the other that does not overlap the second ejection port array in the first ejection port array. 7. The ink jet recording according to claim 6, wherein an amount corresponding to the length of the portion is set, and control is performed so that the determination by the first determination unit and the switching and determination by the second determination unit are further performed. apparatus. The first determination unit acquires information on the ink application amount in each predetermined region of the first ink and the second ink, and determines whether there is the contact region based on the information. An ink jet recording apparatus according to claim 6 or 7 .   9. The ink jet recording apparatus according to claim 6, wherein the second ink has a higher Ka value by the Bristow method than the first ink.   10. The inkjet recording apparatus according to claim 6, wherein the second ejection port array includes a plurality of ejection port arrays. 10.

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