Recording device

Abstract

To prevent occurrence of an air path while restricting a decrease in throughput.SOLUTION: According to surface tension of an ink, a threshold value for performing divided recording / wait is changed and set.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to a recording apparatus.

Background Art

[0002] Patent Document 1 describes performing power monitor control to suppress deterioration of image quality due to overheating of a recording head. In power monitor control, it is described that when the dot count in a region divided into predetermined units is equal to or more than a predetermined dot count, the carriage movement speed and the divided printing count are determined.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, power monitor control is performed to prevent overheating.

[0005] By the way, regarding an ink cartridge that stores ink used in a recording apparatus, there is a configuration that includes an absorber A inside to hold the ink as shown in FIG. 12. As shown in FIG. 12, an ink supply port 501 for supplying ink to the recording head is provided on the bottom surface of the ink cartridge. Ink is supplied from this supply port 501 to the recording head and ink is discharged from the discharge port of the recording head. The ink is in regions with and without the absorber A, and when the ink in the absorber A decreases, the ink flows from region B to the absorber A.

[0006] If the amount of ink ejected per unit time is high, the amount of ink flowing through the ink supply port 501 per unit time will also increase. As a result, the supply of ink that permeates into the absorber may not keep up, and air entering from outside the cartridge may mix with absorber A. An air path (hereinafter referred to as an air path) is created from absorber A to the supply port 501, and instead of ink being supplied from area B to absorber A, air enters absorber A, resulting in ejection failure.

[0007] In Patent Document 1, power monitor control was used to prevent the volume of ejected ink droplets from increasing due to overheating of the recording head, which would cause ink refilling to be insufficient and result in ejection defects such as unevenness or smearing. However, the inventor's research revealed that, regarding the aforementioned air path problem, depending on the ink, the ejection volume conditions may be stricter than the overheating conditions. For example, inks that penetrate the absorbent body slowly tend to cause air paths, and it is necessary to further lower the ejection volume threshold for weight or segmented recording.

[0008] On the other hand, if the dot count threshold is set to match the slow penetration speed of inks within the absorbent material, some inks may require excessive waiting or split recording, resulting in reduced throughput.

[0009] This invention has been made in view of the above problems, and aims to prevent air path generation while suppressing a decrease in throughput. [Means for solving the problem]

[0010] The present invention comprises an ink tank that absorbs and holds ink in an absorbent; a recording head that discharges ink supplied from the ink tank and discharges a first ink and a second ink having a higher surface tension than the first ink; a carriage on which the recording head is mounted and which scans; an acquisition means for acquiring information on the amount of ink discharged into a predetermined area of ​​a recording medium; and a control means for controlling the recording operation such that, if the information on the amount of ink discharged acquired by the acquisition means exceeds a threshold, the number of scans for recording into the predetermined area is greater than when the information on the amount of ink discharged does not exceed a threshold; wherein the threshold set for the second ink, which has a higher surface tension than the first ink, is lower than the threshold set for the first ink. [Effects of the Invention]

[0011] According to the present invention, it is possible to suppress a decrease in throughput while preventing the occurrence of air paths. [Brief explanation of the drawing]

[0012] [Figure 1] This figure shows the schematic external configuration of the recording device according to Embodiment 1. [Figure 2] This figure shows the schematic internal configuration of the recording device according to Embodiment 1. [Figure 3] This figure shows the recording head configuration according to Embodiment 1. [Figure 4] This is a block diagram relating to Embodiment 1. [Figure 5] This is a diagram showing the ink cartridge configuration according to Embodiment 1. [Figure 6] This diagram illustrates image defects caused by airflow. [Figure 7] This is a diagram illustrating the dot count according to Embodiment 1. [Figure 8] This is a diagram illustrating the division record according to Embodiment 1. [Figure 9] This is a flowchart illustrating the control flow of Embodiment 1. [Figure 10]It is a flowchart for explaining the control flow of Embodiment 2. [Figure 11] It is a flowchart for explaining the control flow of Embodiment 3. [Figure 12] It is a diagram for explaining the configuration of an ink cartridge.

Best Mode for Carrying Out the Invention

[0013] (Embodiment 1) (Device Configuration) FIG. 1 is a perspective view showing the appearance of an inkjet recording apparatus (hereinafter sometimes simply referred to as a recording apparatus) applied in the present embodiment, and FIG. 2 is a perspective view showing the inside of the inkjet recording apparatus.

[0014] In the present embodiment, as shown in FIG. 2, after inserting the recording medium in the direction indicated by the arrow from the paper feed tray 12, it is intermittently conveyed to form an image, and is discharged from the paper discharge tray M3160 in FIG. 1.

[0015] In FIG. 2, the recording head 1 mounted on the carriage 5 discharges ink from the nozzles while reciprocating along the guide rail 4 in the directions of arrows A1 and A2 to form an image on the recording medium S2. The recording head 1 has, for example, a plurality of nozzle groups corresponding to inks of different colors. Each color ink is stored in an ink tank (see FIG. 5) and supplied to the recording head 1. FIG. 3 shows the arrangement state of the nozzle rows for discharging 8-color inks mounted on the recording head 1. In the present embodiment, the number of colors of the recording head 1 is 8 colors. The 8 colors are black (K), gray (GY), photo gray (PGY), cyan (C), magenta (M), yellow (Y), photo cyan (C), and photo magenta (M). Also, it is assumed that each color nozzle row has 1000 nozzles at intervals of 1 / 1200 inch (1200 dpi).

[0016] In the present embodiment, the ink tank and the recording head 1 are integrated to form the head cartridge 6 as shown in FIG. 2, and the head cartridge 6 is mounted on the carriage 5.

[0017] Also, by transmitting the driving force of the carriage motor 11 to the carriage 5 via the timing belt 17, the carriage 5 is reciprocated along the guide shaft 3 and the guide rail 4 in the directions of arrows A1 and A2 (main scanning direction). When the carriage 5 moves, the carriage position is detected by the encoder sensor 21 provided on the carriage 5 reading the linear scale 19 provided along the moving direction of the carriage. Then, recording on the recording medium is performed by discharging ink from the recording head 1 while the carriage 5 reciprocates.

[0018] First, the recording medium S2 is supplied from the paper feed tray 12, sandwiched between the conveyance roller 16 and the pinch roller 15, and conveyed to the platen 2. Next, when the carriage 5 moves in the A1 direction and performs recording for one scan, the conveyance roller 16 is driven by the conveyance motor 13 via the linear wheel 20. Then, the recording medium S2 is conveyed a predetermined amount in the direction of arrow B, which is the sub-scanning direction. Thereafter, recording is performed on the recording medium S2 while the carriage 5 scans in the A2 direction. As shown in FIG. 2, the head cap 10 and the recovery unit 14 are provided at the home position, and the recovery process of the recording head 1 is intermittently performed as necessary.

[0019] By repeating the above-described operations, when the recording of one sheet of the recording medium is completed, the recording medium is discharged, and the recording of one sheet is completed.

[0020] FIG. 4 is a block diagram showing the configuration of the inkjet recording apparatus implementing the present embodiment.

[0021] 401 is a motor driver, which is a control circuit for controlling motors such as a carriage motor (operating the recording head), a paper feed motor (moving the recording medium and performing paper feeding and discharging), and a recovery motor (performing the recovery operation of the printing head) for performing the recording operation.

[0022] Recording head 1 has the function of printing an image onto the recording medium. The recording heads are interchangeable, and each recording head has a unique ID. Whether a head has been replaced can be determined by comparing these IDs.

[0023] RAM402 (Random Access Memory) is a memory device that can only retain information while power is supplied; if the power supply is cut off, the information it holds is lost.

[0024] ROM403 (Read Only Memory) is a read-only recording device that stores the control program for the inkjet recording device, and the CPU references this program to perform control operations.

[0025] The CPU404 reads the control program from ROM and executes control of each control device according to the program.

[0026] The interface unit 405 connects the inkjet recording device to the host computer 406 and has the function of receiving recording data from the host computer and sending status to the host computer.

[0027] The non-volatile memory 407 is a recording device that stores and retains various types of information, and it is capable of retaining the recorded information even if the power supply is cut off.

[0028] The control unit 408 consists of keys that accept key operations from the user and a display device for notifying the user of errors, etc.

[0029] The dot count unit 409 is a circuit that has the function of measuring the number of ink droplets (dots) actually ejected from the recording head.

[0030] The divided recording control unit 410 divides the blocks to be recorded during one scan, calculated by the dot count unit 409, into multiple blocks in the main scanning direction, or calculates the number of times the head recording element is driven in one scan across the entire area in the main scanning direction where recording is to be done during one scan. If this number is greater than a predetermined threshold, it reduces the number of times the head recording element is driven in one scan by performing 2-part recording or even 16-part printing.

[0031] The weight control unit 411 divides the range to be recorded during one scan, calculated by the dot count unit 409, into multiple sections in the main scan direction, and calculates the dot count value for each section. If the dot count is greater than a predetermined threshold, a wait is performed between scans. The time from the wait determination to the execution of the wait can be measured using a timer (not shown).

[0032] The recording method control unit 412 waits until data for one scan is stored in the RAM 402, which functions as a recording buffer, and then requests processing from the segmented recording control unit 410 and the wait control unit 411. It then receives information on the number of segmented recordings determined by the segmented recording control unit 410 and the wait time determined by the wait control unit 411, and executes recording control.

[0033] (Ink cartridge) An ink cartridge comprises ink and an ink storage section for storing the ink. Figure 5 is a schematic cross-sectional view showing one embodiment of an ink cartridge. As shown in Figure 5, an ink supply port 501 for supplying ink to the recording head is provided on the bottom surface of the ink cartridge. The inside of the ink cartridge is an ink storage section for storing ink. The ink storage section consists of an ink storage chamber 502 and an absorbent storage chamber 504, which are in communication with each other via a communication port 503. The absorbent storage chamber 504 is also in communication with the ink supply port 501. Liquid ink 505 is stored in the ink storage chamber 502, and absorbent materials 506 and 507 that hold the ink in an impregnated state are stored in the absorbent storage chamber 504. The material of the absorbent materials 506 and 507 is a fibrous material that is so-called sponge-like.

[0034] Furthermore, the ink storage section may not have an ink storage chamber for storing liquid ink, but rather may be configured to hold the entire amount of ink stored by an absorbent.

[0035] (Surface tension of ink) Surface tension is measured using an automatic surface tension meter DY-300 (manufactured by Kyowa Interface Science Co., Ltd.) after adjusting the ink temperature to 25°C. The measurement method is the Wilhelmy method (plate method, vertical plate method), which is performed automatically. The following explanation will focus on four ink colors: black ink (K), cyan ink (C), magenta ink (M), and yellow ink (Y).

[0036] In this embodiment, the color inks (cyan ink (C), magenta ink (M), and yellow ink (Y)) have relatively low surface tension to ensure uniform color reproduction in the recorded image. Lower surface tension allows the ink to spread more easily on the recording medium, resulting in larger ink droplets. Therefore, the surface of the recording medium is less exposed in the recorded image, leading to better color reproduction.

[0037] Because black ink (K) is often used for characters and fine lines in recorded images, its surface tension is higher than that of color inks, prioritizing color density over uniformity. In particular, if the recording medium is highly permeable, using black ink with low surface tension (high permeability) may cause the black ink to penetrate the recording medium too much, potentially resulting in insufficient color density for characters and fine lines.

[0038] Therefore, in this embodiment, a recording head capable of ejecting the high-surface-tension, low-penetration black ink described above is used. (Table 1) shows the measurement results of the surface tension of each of the above-mentioned ink colors.

[0039] [Table 1]

[0040] In this embodiment, all inks are dye-based inks. While dye-based inks are preferable, they are not limited to them, as pigment-based inks may adhere to the absorbent material depending on the type.

[0041] (Relationship between ink discharge volume and ink surface tension) Table 2 shows the results of recording a solid image at various recording duty cycles using the recording device in this embodiment. The duty cycle values ​​are defined as 100% when 1 dot is placed at 1200 dpi.

[0042] [Table 2]

[0043] "○" indicates that, as shown in Figure 6(a), a solid image was printed without image defects caused by the air path during recording. "×" indicates that, as shown in Figure 6(b), some nozzles failed to dispense due to the air path, resulting in image defects (streaks) as shown in F.

[0044] Table 2 shows that inks with higher surface tension tend to produce more air passages when recorded at high duty cycles. The speed of ink penetration within absorbers 506 and 507 is related to the ink's surface tension (ease of penetration). Higher surface tension makes the ink more likely to form droplets and spread easily. Therefore, inks with higher surface tension penetrate the absorber more slowly, making them more prone to air passages.

[0045] Therefore, in this embodiment, an appropriate duty cycle threshold is set according to the surface tension of the ink, and when recording a duty cycle in which image defects occur in one scan, segmented recording is performed.

[0046] (Split recording control) The specific control in the segmented recording control unit 410 will be explained using a schematic diagram.

[0047] The threshold values ​​for segmented recording control are evaluated or calculated in advance, taking into account the conditions under which air paths occur, and are prepared as threshold tables for each color and stored in ROM 403 beforehand.

[0048] This section describes the dot counting method in segmented recording control. Figure 7 shows the dot counting method of the segmented recording control unit 410 in this embodiment. Although the actual dot counting is performed on the recording buffer, Figure 7 schematically depicts it as dot counting on the recording medium for the sake of clarity. The unit dot represents the number of ink droplets (dots) arranged at 1200 dpi intervals.

[0049] For each scan, the number of dots of each color in a predetermined area is counted. In this embodiment, the number of dots of each color is counted for each dot counting area which is 50 dots horizontally and the length of the nozzle (1000 dots) vertically. Note that the size of the dot counting area is not limited to the above size. However, if the dot counting area size is set too small, the total number of unit areas to be counted becomes enormous, and depending on the processing capacity of the device, this may cause operational delays, etc. Conversely, if the dot counting area size is set too large, the dot count will be averaged out due to the large area, and the original purpose of preventing air paths may not be achieved. For this reason, the dot counting area size needs to be set to an appropriate value according to the processing capacity of the device.

[0050] Table 3 shows an example of a threshold table for segmented recording control used in this embodiment.

[0051] [Table 3]

[0052] Each control table has a dot count threshold set for each color. In this embodiment, the value of each threshold is expressed as a duty cycle. The threshold duty cycle values ​​shown in Table 3 define the recording duty cycle as 100% when 1 dot is placed at 1200 dpi. Note that the value of each threshold is not limited to duty cycle; it is sufficient to know the ejection amount per unit area within the dot count area, so it may also be specified by the number of dots in the dot count area or the amount of ink ejected.

[0053] Table 3 shows that if the threshold duty cycle is exceeded, two-part recording is applied. Two-part recording is a recording method in which, instead of recording all the data for each color included in one scan in a normal (non-two-part recording) scan, the data is divided and recorded according to a specified number of divisions. Note that the number of divisions for two-part recording is not limited to the two divisions mentioned above, and may be set according to the performance of the recording device, ink, tank, and other chemical products.

[0054] Here, the method of controlling split recording will be explained using Figure 8. In this embodiment, in order to prevent the air path described above, two-part recording is performed, in which data that would normally be recorded in one recording scan is divided and recorded in two recording scans. This reduces the amount of ink ejected per scan, and the occurrence of air paths can be suppressed.

[0055] Figure 8 illustrates the two-part recording method as an example. As shown in Figure 8(a), in a normal recording scan, 1000 dots of data corresponding to the nozzle length of the recording head 1 are recorded in one recording scan. However, if it is determined that recording all the data in one recording scan may cause an air path to occur, that is, if the duty cycle exceeds a threshold, two-part recording is performed as shown in Figure 8(b). In two-part recording, the recording data is divided and recorded in two recording scans. In the first recording scan, data corresponding to half the duty cycle of normal recording is recorded, and without performing a transport operation, the second recording scan is performed to record the data corresponding to the remaining half. The images recorded based on the two sets of data are combined to obtain an image equivalent to the image recorded in one recording scan, as shown in Figure 8(a). As shown in Figure 8(c), the recording data is divided by taking the logical AND of the data before division and the mask data of division mask 1 and division mask 2 to create division data 1 and division data 2, and then dividing it into two sets of recording data. By dividing the recording data into two recording scans in this way, image defects caused by air paths are prevented. Furthermore, the number of recording scans used for division in divided recording is not limited to the aforementioned two. Also, although Figure 8 shows the case when normal recording is a single pass (single scan), when performing divided recording in multi-pass recording of two or more passes (two or more), the data that would normally be recorded in one recording scan can be similarly divided into multiple recordings. For example, a normal two-pass recording can be made into a four-pass recording.

[0056] (Control flow) Based on the configuration and control method described above, the control flow of this embodiment will be explained using Figure 9. This process is performed by the CPU 404 executing according to the program stored in the ROM 403.

[0057] First, in step S901, the user presses the print button on the screen of the host computer 406, sending print data (hereinafter referred to as a job) from the host computer 406 to the recording device. The interface unit 405 receives the job.

[0058] Next, in step S902, the dot count unit 409 counts the dots of each color within all the multiple dot count areas in one scan. The counted dots are stored in RAM 402.

[0059] In step S903, the total dot count for each color is calculated by summing the dot counts for each color within each dot count area, based on the dot counts for each color counted in step S902. Furthermore, the recording duty cycle is calculated from the total dot count value and the area size. In addition, threshold data is obtained from the threshold table stored in ROM403. Note that if the thresholds in the threshold table are set by the number of dots, the conversion from dot count to recording duty cycle is unnecessary.

[0060] In step S904, the segmented recording control unit 410 determines whether the dot count exceeds a threshold. If even one color exceeds the threshold, the process proceeds to step S906, where the recording method control unit 412 controls the recording head 1 to perform segmented recording. If no colors exceed the threshold, the process proceeds to step S905, where the recording method control unit 412 controls the recording head 1 to perform normal recording.

[0061] Once the scan is complete in step S905 or step S906 and recording of one scan area is finished, the process proceeds to step S907. In step S907, it is determined whether the entire scan has been completed. If not, in step S908, the data for the next scan is loaded onto the recording buffer, and the process returns to step S902 to perform a dot count on the newly loaded data. By repeating steps S902 to S907 in this manner until the job is finished, recording can be completed without causing image defects due to air path generation.

[0062] (Embodiment 2) Split recording has the disadvantage of lower throughput than inter-scan weighting because it distributes data that should ideally be printed in one scan across multiple scans. Therefore, in this embodiment, inter-scan weighting is employed to minimize the reduction in throughput. Inter-scan weighting involves inserting a weight between one scan and the next. By providing a weight, ink supply is kept on track, and the occurrence of air paths is suppressed. The parts that are the same as in Embodiment 1 are omitted.

[0063] (Weight control) The specific control in the weight control unit 411 of Embodiment 2 will be explained using schematic diagrams and flowcharts. Note that parts that overlap with Embodiment 1 will be omitted.

[0064] Figure 10 is a control flowchart in Embodiment 2. This process is performed by the CPU 404 executing according to a program stored in the ROM 403.

[0065] Similar to Embodiment 1, when the user presses the print button on the screen of the host computer 406, a job is sent from the host computer 406 to the recording device. The interface unit 405 receives the job (step S1001).

[0066] Next, in step S1002, the dot count unit 409 counts the dots of each color within all the multiple dot count areas in one scan. The counted dots are stored in RAM 402.

[0067] In step S1003, the total dot count for each color is calculated by summing the dot counts for each color within each dot count area, based on the dot counts for each color counted in step S1002. Furthermore, the recording duty cycle is calculated from the total dot count value and the area size. In addition, threshold data is obtained from the threshold table stored in ROM 403. Note that if the thresholds in the threshold table are set by the number of dots, the conversion from dot count to recording duty cycle is unnecessary.

[0068] In step S1004, the segmented recording control unit 410 determines whether the dot count exceeds a threshold. If there are five or more areas exceeding the threshold for one scan of data, the process proceeds to step S1005, where the recording method control unit 412 controls the recording head 1 and executes the set inter-scan wait. In this control, 2.0 seconds is specified as the inter-scan wait time. However, the inter-scan wait time is not limited to this. Furthermore, if the wait is executed in step S1005, or if the dot count does not exceed the threshold in step S1004, the process proceeds to S1006, where the recording method control unit 412 controls the recording head 1 and performs a recording operation for one scan without an inter-scan wait.

[0069] In step S1006, when the scan is complete and recording of one scan area is finished, the process proceeds to step S1007. In step S1007, it is determined whether the entire scan has been completed. If not, in step S1008, the data for the next scan is loaded onto the recording buffer, and the process returns to step S1002 to perform a dot count on the newly loaded data. In this embodiment, by repeating steps S1002 to S1007 until the job is completed, recording can be completed without causing image defects due to air path generation. Furthermore, it is possible to achieve an effect that does not reduce throughput even further than in Embodiment 1. Whether the time required for the increased scan or the time for the inter-scan wait is shorter depends on the mode and settings, so the shorter time can be selected for each device.

[0070] (Embodiment 3) Regarding air passages, the likelihood of them occurring varies depending on the surrounding environmental conditions such as dryness and temperature; therefore, in this embodiment, a threshold value is set according to the environmental conditions. The parts that are the same as in Embodiments 1 and 2 are omitted.

[0071] Table 4 shows the results of an investigation into the occurrence of image defects due to air pore generation at various temperature and humidity levels.

[0072] [Table 4]

[0073] From the results above, it can be confirmed that air passes are more likely to occur at lower temperatures and lower humidity. This is thought to be because, at low temperatures and low humidity, the water in the ink evaporates, increasing its viscosity, which slows down the rate at which it spreads within the ink cartridge's absorbent material.

[0074] Therefore, in this embodiment, taking into account the environmental differences in the likelihood of air path generation, the threshold for segmented recording is set according to the environment as shown in Table 5 below.

[0075] [Table 5]

[0076] Tables 1-3 show the threshold values ​​corresponding to each environment.

[0077] Table 1 is a threshold table for low temperature and low humidity, selected when the temperature is 20°C or below and the humidity is 20% or below. Table 2 is a threshold table for high temperature and low humidity, selected when the temperature is 20°C or above and the humidity is 20% or below. Table 3 is a threshold table for high temperature and high humidity, selected when the temperature is above 20°C and the humidity is greater than 20%. A threshold table for when the temperature is below 20°C and the humidity is greater than 20% can also be provided.

[0078] Embodiment 3 will be described based on the above results and table. The recording device used in Embodiment 3 is equipped with a temperature and humidity sensor (not shown) and can acquire the temperature and humidity of the surrounding operating environment.

[0079] Figure 11 is a specific flowchart of this embodiment. Parts that overlap with embodiments 1 and 2 are omitted.

[0080] Steps S1101 to S1102 perform the same processing as steps S901 to S902 in Figure 9.

[0081] Next, in step S1103, ambient temperature and humidity are acquired from a temperature and humidity sensor (not shown). In step S1104, the total dot count for each color is calculated by summing the dot counts for each color in each dot count area, and the recording duty cycle is calculated from the total dot count value and the area size. In addition, a threshold table corresponding to the temperature and humidity environment acquired in step S1103 is obtained from ROM 403.

[0082] In step S1105, the segmented recording control unit 410 compares the dot count result from step S1102 with the threshold table selected in step S1104 for each color. If even one dot count area exceeds the duty threshold, the process proceeds to step S1106, where the recording method control unit 412 controls the recording head 1 to perform segmented recording. If no color exceeds the threshold, the process proceeds to step S1107, where the recording method control unit 412 controls the recording head 1 to perform a normal recording scan. Once a full scan or segmented recording scan is complete, the process proceeds to step S1108. In step S1108, it is determined whether the full scan has been completed. If not, in step S1109, the data for the next scan is loaded onto the recording buffer, and the process returns to step S1102 to perform dot counting on the newly loaded data. In this embodiment, by repeating steps S1102 to S1108 until the job is completed, recording can be completed without causing image defects due to air path generation.

[0083] In this embodiment, since the likelihood of air path formation differs depending on temperature and humidity, threshold settings are made according to the required environment. As a result, the necessary segmented recording operation is performed according to the environment, and the effect of not causing image defects due to air path formation can be obtained without reducing throughput compared to Embodiment 1.

Claims

1. An ink tank that absorbs and holds ink in an absorbent material, A recording head that ejects ink supplied from the ink tank and ejects a first ink and a second ink having a higher surface tension than the first ink, A scanning carriage equipped with the aforementioned recording head, An acquisition means for acquiring information regarding the amount of ink ejected into a predetermined area of ​​a recording medium, The system includes a control means that controls the recording operation such that, if the information regarding the amount of ink ejected acquired by the acquisition means exceeds a threshold, the number of scans for recording to the predetermined area is greater than when the information regarding the amount of ink ejected does not exceed a threshold. A recording device characterized in that the threshold value set for the second ink, which has a higher surface tension than the first ink, is lower than the threshold value set for the first ink.

2. An ink tank that absorbs and holds ink in an absorbent material, A recording head that ejects ink supplied from the ink tank and ejects a first ink and a second ink having a higher surface tension than the first ink, A scanning carriage equipped with the aforementioned recording head, An acquisition means for acquiring information regarding the amount of ink ejected into a predetermined area of ​​a recording medium, The recording operation is controlled by a control means that, if the information regarding the amount of ink ejected acquired by the acquisition means exceeds a threshold, provides a weight between the previous scan and the scan for recording to the predetermined area, compared to when the information regarding the amount of ink ejected does not exceed the threshold. A recording device characterized in that the threshold value set for the second ink, which has a higher surface tension than the first ink, is lower than the threshold value set for the first ink.

3. The recording apparatus according to claim 1 or 2, characterized in that the first ink and the second ink are dye inks.

4. The recording device according to claim 1 or 2, characterized in that the absorbent material is made of fiber material.

5. The recording device according to claim 1 or 2, characterized in that the threshold is set to a plurality of thresholds according to the temperature, and the threshold for temperatures lower than the first temperature is set lower than the threshold for the first temperature.

6. The recording device according to claim 1 or 2, characterized in that the threshold is set to a plurality of thresholds depending on the threshold, and the threshold for humidity lower than the first humidity is set lower than the threshold for the first humidity.

7. The recording apparatus according to claim 1 or 2, characterized in that the recording head has the same number of nozzles for each color.

8. The recording head is capable of ejecting a third ink with a lower surface tension than the first ink. The recording device according to claim 1 or 2, characterized in that the threshold value set for the third ink is higher than the threshold value set for the first ink.

9. The recording device according to claim 1 or 2, characterized in that the first ink is a color ink and the second ink is a black ink.

Images