WO2005120833A1 - インクジェット記録方法 - Google Patents
インクジェット記録方法 Download PDFInfo
- Publication number
- WO2005120833A1 WO2005120833A1 PCT/JP2005/010563 JP2005010563W WO2005120833A1 WO 2005120833 A1 WO2005120833 A1 WO 2005120833A1 JP 2005010563 W JP2005010563 W JP 2005010563W WO 2005120833 A1 WO2005120833 A1 WO 2005120833A1
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- WO
- WIPO (PCT)
- Prior art keywords
- recording
- data
- ink
- nozzle rows
- recording head
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/205—Ink jet for printing a discrete number of tones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
- B41J2/2128—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of energy modulation
Definitions
- the present invention uses various types of recording media by using a recording head on which a plurality of nozzle rows are formed, and ejecting ink droplets of the nozzle rows while moving the recording head.
- the present invention relates to an ink jet recording method for recording an image on a paper.
- the present invention is applicable to all devices that use recording media such as paper, cloth, leather, nonwoven fabric, HP paper, and the like, and even metal.
- Specific examples of applicable equipment include office equipment such as printers, copiers, and facsimile machines, and industrial production equipment.
- OA devices such as personal computers and word processors have become widespread, and various recording devices and recording methods have been developed in order to record information input by these devices on various recording media.
- video information and the like to be processed tend to be colored in accordance with the improvement of its information processing ability, and recording devices that output the processed information are also being increasingly used in color.
- recording devices that can record color images, depending on cost and function.From inexpensive devices that have relatively simple functions, depending on the type of image to be recorded and the purpose of use.
- multi-functions that can select recording speed and image quality.
- Inkjet recording apparatuses are widely used in printers, copiers, facsimile machines, and the like because they have low noise, low running cost, can be miniaturized, and are easy to colorize recorded images.
- a color jet recording apparatus records a color image using three color inks of cyan, magenta, and yellow, or four inks obtained by adding black to these inks. Do.
- a conventional ink jet recording apparatus in order to record a high-colored color image without ink bleeding, it is common to use a special paper having an ink absorbing layer as a recording medium. .
- serial scan type ink jet recording apparatus nozzle groups corresponding to each ink color used for recording are provided as recording means for performing color recording or the like using a plurality of color inks.
- the used ink jet recording head is used.
- the recording head is capable of discharging the ejected local ink forming the nozzle.
- the serial scan type ink jet recording device moves the recording head in the main running direction while discharging ink from its discharge port, and transports the recording medium in the sub running direction that intersects the main running direction.
- a so-called side-by-side recording head is used as a recording head, in which nozzle groups (used nozzle groups) corresponding to each ink color used for recording are sequentially arranged side by side in the main scanning direction.
- the horizontal recording heads can discharge ink droplets from each of the nozzle groups on the same raster in the same printing operation.
- a high-density recording element having a high density of recording elements of a recording head including a nose is provided. It is effective to use a density recording head.
- high-density recording heads using a semiconductor process have appeared, and high-density recording heads with a nozzle array of 600 dpi (about 42.3 ⁇ ) have been manufactured.
- the nozzle row corresponding to one ink color is divided into a plurality of nozzle rows parallel to each other, and the positions of the nozzles in the nozzle rows are determined in the sub-scanning direction.
- Recording heads with a fixed offset have also been manufactured. For example, when the density of nozzles in one nozzle array is 600 dpi, two nozzle arrays are arranged in parallel, and the positions of the nozzles in the two nozzle arrays are 1200 dpi (approximately 21.2 zm) in the sub-scanning direction. ), It can be used as a 1200 dpi high-density recording head.
- Another method for achieving higher image quality recording is to reduce the size of ink droplets for recording an image.
- it is effective to reduce the size of the recording element of the recording head including the nozzles and to use a recording head capable of ejecting small droplets of ink.
- recording heads with an ink ejection force of 5 pl have appeared, and recording heads that are advantageous for high-definition recording have been manufactured.
- FIG. 1 is a view of the ejection port forming surface of the recording head H as viewed from above.
- the ejection port forming the nozzle N is formed on the ejection port formation surface.
- LI and L2 are swelling systems 1J, and ink is ejected from each swelling N in a direction perpendicular to the paper surface of FIG.
- the recording head H performs recording by discharging ink from the nozzles N of the nozzle arrays LI and L2 while moving in the main scanning direction indicated by the arrow X in FIG. At this time, ink droplets ejected vertically below the nozzles N in the nozzle row L1 draw in the surrounding air, creating a “gas wall” in which the force also moves in the direction of the arrow X.
- FIG. 2 is a diagram of the recording head H viewed from the lateral direction, and shows the flow of air behind the “gas wall”.
- FIG. 3 is a diagram of the recording head H as viewed from the front in the main running direction, and focuses on the nose row L2.
- the ink droplets ejected from the nozzle (end nozzle) located at the end of the nozzle row L2 are ejected in the direction of approach as they approach the recording medium W due to the airflow in the direction of arrow A. May bend inside the nozzle stem 1JL2. When such a bend occurs, the ink droplets ejected from the end nozzles are not allowed to land on the recording medium W.
- Patent Document 1 discloses a multi-pass printing method in which a predetermined print area is completed by a plurality of runs of a print head, and considers the relationship between the number of runs (the number of passes) and the adverse effect of airflow. Then, a method of controlling the amount of applied ink is described. That is, the amount of applied ink is controlled according to the number of passes in order to avoid the adverse effects of the airflow.
- Patent Document 1 European Patent Application Publication No. 1405724
- a method of improving the driving frequency of the recording head that is, increasing the moving speed of the recording head in the main scanning direction can be considered.
- the influence of the airflow as described above also changes according to the moving speed of the recording head. For example, even when printing is performed with the same number of passes, if the moving speed of the print head is different, the degree of influence of the airflow on the ejected ink droplets is greatly changed.
- the influence of the air current increases when the recording head moves at high speed, and the landing accuracy of the ink on the recording medium is deteriorated, which may cause a deterioration in image quality.
- An object of the present invention is to generate a high-quality image regardless of the moving speed of a print head by generating print data so as not to cause an airflow effect accompanying ink ejection.
- An object of the present invention is to provide an ink jet recording method.
- the inkjet recording method of the present invention uses a recording head including a plurality of nozzle rows in which a plurality of nozzles capable of ejecting ink droplets are arranged in a predetermined direction, and moves the recording head in a direction intersecting the predetermined direction.
- a recording head including a plurality of nozzle rows in which a plurality of nozzles capable of ejecting ink droplets are arranged in a predetermined direction, and moves the recording head in a direction intersecting the predetermined direction.
- Moving the recording head A step of designating one recording mode from among a plurality of recording modes having the same number of movements and different moving speeds of the recording head, and from the plurality of nozzle arrays according to the designated recording mode.
- the inkjet recording method of the present invention is directed to a method of using a recording head including a plurality of nozzle rows in which a plurality of nozzles capable of ejecting ink droplets are arranged in a predetermined direction, wherein the recording head is arranged in a direction intersecting the predetermined direction.
- the ink jet recording method for recording an image on a recording medium by ejecting ink droplets from the plurality of nozzle rows based on the recording data while moving the recording medium the recording is performed on a predetermined area of the recording medium.
- the plurality of image processes corresponding to the print mode of the present invention convert the input data indicating a predetermined luminance level into the print data having different ejection amounts per unit area of ink ejected from the plurality of nozzle arrays. It is characterized by the following.
- the first nozzle row in which a plurality of nozzles capable of discharging ink are arranged in a predetermined direction and the ink discharged from the first nozzle row have the same color and a different discharge amount.
- a plurality of nozzles capable of discharging ink are arranged in the predetermined direction.
- a recording head having at least two nozzle rows and ejecting ink from the first and second nozzle rows based on recording data while moving the recording head in a direction intersecting the predetermined direction
- a plurality of recording modes in which the number of movements of the recording head required for recording in a predetermined area of the recording medium is the same and the moving speed of the recording head is different. From the input image data so that the ejection amount per unit area of the ink ejected from the first and second nozzle arrays differs according to the designated recording mode.
- the corresponding to each of the plurality of nozzle rows And a conversion step of converting the data into recording data.
- the inkjet recording method of the present invention uses a recording head including a plurality of nozzle rows in which a plurality of nozzles capable of ejecting ink droplets are arranged in a predetermined direction, and moves the recording head in a direction intersecting the predetermined direction.
- the moving speed of the recording head and the The input image data corresponds to each of the plurality of nozzle rows so that the amount of ink ejected from the plurality of nozzle rows per unit area differs according to the facing distance between the recording head and the recording medium. And converting the recording data into the recording data.
- the inkjet recording method of the present invention is directed to a method of using a recording head including a plurality of nozzle rows in which a plurality of nozzles capable of ejecting ink droplets are arranged in a predetermined direction, wherein the recording head is arranged in a direction intersecting the predetermined direction.
- the recording head is moved at a first moving speed.
- One of a plurality of recording modes including a first recording mode for moving the recording head and a second recording mode for moving the recording head at a second moving speed higher than the first moving speed.
- the maximum ink ejection amount per unit area indicated by the print data obtained in the conversion step is specified by the second print mode as compared with the case where the first print mode is specified. It is characterized by the fact that less is required.
- the inkjet recording method of the present invention is directed to a method of using a recording head including a plurality of nozzle rows in which a plurality of nozzles capable of ejecting ink droplets are arranged in a predetermined direction, wherein the recording head is arranged in a direction intersecting the predetermined direction.
- the recording head is moved at a first moving speed.
- One of a plurality of recording modes including a first recording mode for moving the recording head and a second recording mode for moving the recording head at a second moving speed higher than the first moving speed.
- Specify the recording mode And a conversion step of converting input image data into the print data corresponding to each of the plurality of nozzle arrays in accordance with the specified print mode, wherein the print data obtained in the conversion step is included.
- the maximum number of ink shots per unit area is smaller when the second print mode is specified than when the first print mode is specified.
- input image data is assigned to each of the plurality of nozzle arrays so that the ejection amount per unit area of the ink droplets ejected from the plurality of nozzle arrays is made different according to the moving speed of the recording head.
- the print data can be generated so that the influence of the air flow accompanying the ejection of the ink does not occur. As a result, a high-quality image can be recorded regardless of the moving speed of the recording head.
- FIG. 1 is a view of a recording head as viewed from above to explain the generation of an air current accompanying the ejection of ink.
- FIG. 2 is a side view of a recording head for describing the generation of an air current accompanying the ejection of ink.
- FIG. 3 is a view of a recording head as viewed from a traveling direction for explaining the generation of an airflow accompanying the ejection of ink.
- FIG. 4 is a partially cutaway perspective view of an inkjet recording apparatus to which the present invention can be applied.
- FIG. 5 is a schematic perspective view of an ink ejection section of a recording head used in the ink jet recording apparatus of FIG.
- FIG. 6 is a schematic configuration diagram of a recording system including the inkjet recording device of FIG. 4
- FIG. 7 is a block diagram of a control system of the ink jet recording apparatus of FIG. 4.
- FIG. 8 is a block diagram of an image processing system in the recording system of FIG. 6.
- FIG. 9 is an explanatory diagram of a nozzle configuration of a recording head used in the ink jet recording apparatus of FIG.
- FIG. 10 is an explanatory diagram of an airflow control line obtained experimentally in the recording system of FIG. It is.
- FIG. 11A is an explanatory diagram of a dot pattern formed by a large nose row of the recording head in FIG. 9;
- FIG. 11B is an explanatory diagram of a dot pattern formed by a row of small nozzles of the recording head in FIG.
- FIG. 12 is an explanatory diagram of a format of recording data in the recording system of FIG. 6.
- FIG. 13 is a block diagram of a recording control unit in FIG. 7.
- FIG. 14 is a flowchart for explaining data expansion processing of the arrangement pattern allocation module in FIG.
- FIG. 15A is an explanatory diagram of an example of print data converted by post-processing of FIG. 8 when the moving speed of the print head is 35 [inch / sec].
- FIG. 15B is an explanatory diagram of an example of print data converted by the post-processing of FIG. 8 when the moving speed of the print head is 25 [inch Z seconds].
- FIG. 15C is an explanatory diagram of an example of print data converted by the post-processing of FIG. 8 when the moving speed of the print head is 12.5 [inch / sec].
- FIG. 16A is an explanatory diagram of the relationship between the recording data of FIG. 15A and the ink ejection amount.
- FIG. 16B is an explanatory diagram of the relationship between the print data of FIG. 15B and the ejection amount of ink.
- FIG. 16C is an explanatory diagram of the relationship between the recording data of FIG. 15C and the ejection amount of ink.
- This example is an application example as a serial printer type ink jet recording apparatus having a plurality of recording heads.
- FIG. 4 is a schematic perspective view of a main part of an ink jet recording apparatus to which the present invention can be applied.
- a plurality (four) of head cartridges 1A, IB, 1C, and 1D can be replaced with a carriage 2. It is installed.
- the head force The whole or arbitrary one of the cartridges 1A to 1D is also referred to as a recording head 1.
- the head cartridges 1A to 1D are for recording using inks of different colors, and their ink tanks include, for example, cyan (C), magenta (M), and yellow (Y). ) And black (Bk).
- Each of the head cartridges 1A to 1D is exchangeably mounted on a carriage 2, and the carriage 2 has a cartridge 1A to: a connector holder for transmitting drive signals and the like to each recording head via an ID-side connector (electrical connection). Part) is provided.
- the carriage 2 is guided by a guide shaft 3 installed in the apparatus main body so as to be movable in the main running direction indicated by an arrow X.
- the carriage 2 is driven by a main running motor 4 via a motor pulley 5, a driven pulley 6, and a timing belt 7, and its position and movement are controlled.
- the recording medium 8 such as a sheet of paper or a thin plastic plate is conveyed through a position (recording section) facing the discharge port surface of the recording head 1 by rotation of two sets of conveying rollers 9, 10 and 11, 12 (paper). Sent).
- the ejection port surface of the recording head 1 is a surface on which ejection ports constituting nozzles are formed, and the recording head 1 is capable of ejecting ink droplets from its ejection location.
- the back surface of the recording medium 8 is supported by a platen (not shown) so that a flat recording surface is formed in the recording section.
- the ejection port surface of the recording head 1 of each cartridge mounted on the carriage 2 projects downward from the carriage 2 and contacts the recording surface of the recording medium 8 between the two pairs of transport rollers 9, 10, 11 and 12. opposite.
- the recording head 1 of the present example is an ink jet recording head that ejects ink using thermal energy, and includes an electrothermal converter (heater) for generating thermal energy. That is, a film boiling occurs in the ink in the nozzle by the thermal energy generated from the electrothermal transducer, and the ejected locator ink droplet is ejected by utilizing the pressure change caused by the growth and shrinkage of the bubble at that time.
- the method of discharging ink in the recording head 1 is not specified at all, and for example, a method of discharging ink using a piezo element or the like may be used.
- FIG. 5 is a schematic perspective view of a main part of the ink ejection unit 13 in the recording head 1 of the present example.
- a plurality of discharge ports 22 are formed at a predetermined pitch on a discharge port face 21 facing a recording medium 8 with a predetermined gap (about 0.5 to 2 [mm]).
- the common liquid chamber 23 to which ink is supplied and each of the discharge ports 22 are communicated by each of the flow paths 24 to discharge the ink.
- An electrothermal converter (heating resistor, etc.) 25 for generating energy is provided along the wall surface of each flow path 24.
- the recording head 1 is mounted on the carriage 2 such that the ejection ports 22 are arranged in a row in a direction intersecting the scanning direction (the direction of the arrow X) of the carriage 2.
- the electrothermal transducer 25 By driving (energizing) the electrothermal transducer 25 based on the image signal or the ejection signal, the ink in the flow path 24 corresponding to the film is boiled, and the pressure generated at that time is used to discharge the ink from the ejection port 22. To eject ink droplets.
- FIG. 6 is a block diagram showing a hardware configuration of a recording system as an example to which the present invention is applied.
- the system according to the present embodiment generally includes a host device 1000 for generating print data and setting a UI (user interface) for generating the print data, and forming an image on a recording medium based on the print data. And an ink jet recording apparatus 2000.
- the host device (host computer) 1000 includes a CPU 1001, R1M 1002, RAM 1003, system bus 1004, I / O controllers (CRTC, HDC, FDC, etc.) 1005 for various input / output devices, and an external interface (I / F) 1006, external storage device (HDD / FDD) 1007 such as hard disk drive (HDD) or floppy disk drive (FDD), real-time clock (RTC) 1008, CRT1009, and input device such as keyboard and mouse (KeyBoard / Mouse) 1010 etc. are provided.
- I / F external interface
- HDD / FDD hard disk drive
- FDD floppy disk drive
- RTC real-time clock
- CRT1009 keyboard and mouse
- keyboard and mouse KeyBoard / Mouse
- the CPU 1001 operates based on an application program read from the external storage device 1007 or the like into the RAM 1003, a communication program, a printer driver, an operating system (OS), and the like.
- OS operating system
- the system When the power is turned on, the system functions as a system by booting from the ROM 1002, loading ⁇ S from the external storage device 1007 or the like into the RAM 1003, and then loading application programs and driver software in the same manner.
- the external IZF 1006 sequentially transmits the recording data spooled in the RAM 1003 or the external storage device 1007 (HDD) to the recording device 2000.
- the input device 1010 fetches instruction data from the user into the host computer via the I / O controller 1005.
- the RTC 1008 is for measuring the system time, and acquires and sets time information via the I / O controller 1005.
- the CRT1009 is a display device, and is controlled by the CRTC in the I / O controller 1005. Controlled. These blocks of the CRT 1009 and the input device 1010 constitute a user interface.
- FIG. 7 is a block diagram of a control system in the ink jet recording apparatus 2000 of FIG. 6.
- a controller 100 is a main control unit, and includes, for example, a CPU 101 in the form of a microcomputer, a program, required tables, and other fixed data. It has a stored ROM 103, a RAM 105 provided with an area for developing print data, a work area, and the like, and a recording control unit 1010 shown in FIG. Print data, other commands, status signals, and the like are transmitted and received between the host device 1000 and the controller 100 via an interface (I / F) not shown.
- I / F interface
- the operation unit 120 is a group of switches that receive an instruction input by the operator, and includes a power switch 122, a switch 124 for instructing the start of printing, a recovery switch 126 for instructing activation of suction recovery, and the like.
- the head driver 140 is a driver that drives an electrothermal transducer (hereinafter, also referred to as an “ejection heater”) 25 of the recording head 1 according to recording data or the like.
- the head driver 140 includes a shift register that aligns print data in accordance with the position of the discharge heater 25, a latch circuit that latches print data at an appropriate timing, and a logic that operates the discharge heater 25 in synchronization with a drive timing signal. In addition to the circuit elements, it has a timing setting unit and the like for appropriately setting the drive timing (ejection timing) to match the formation positions of the ink dots.
- the print head 1 is provided with a sub-heater 142.
- the sub-heater 142 adjusts the temperature for stabilizing the ink ejection characteristics of the print head 1.
- the sub heater 142 is formed on the substrate of the print head 1 at the same time as the discharge heater 25, or the main body of the print head 1 Alternatively, it can be attached to the head cartridge.
- the motor driver 150 is a driver for driving the main drive motor 4 for moving the carriage 2 in the main drive direction.
- the motor 'driver 160 is a driver for driving a sub-running motor 162 for transporting the recording medium 8 in the sub-running direction.
- FIG. 8 shows a recording system, which is an example of an object to which the present invention is applied, along the flow of recording data. It is the functional block diagram shown. As described above, the printing apparatus 2000 of this embodiment performs printing using four color inks of cyan, magenta, yellow and black.
- Programs that run on the operating system of the host device 1000 include applications and printer drivers.
- the application J0001 executes a process of creating recording data to be recorded by the recording device 2000.
- the recorded data or the data before the editing or the like can be taken into the personal computer (PC) type host device 1000 via various media.
- the PC-type host device 1000 of this example can take in, for example, JPEG image data captured by a digital camera via a CF card.
- image data in, for example, a TIFF format read by a scanner or image data stored in a CD-ROM can be captured.
- data on the Web can be imported via the Internet.
- These fetched data are displayed on the monitor of the host device 1000, and are edited and processed via the application J0001, for example, to thereby create sRGB standard recording data R, G, and B, for example. Then, in response to a recording instruction, the recording data is passed to the printer driver.
- the printer driver of the present embodiment includes a processing unit for the first-stage processing # 10002, the second-stage processing # 10003, the supplementary IEJOOOO 4, the halftoning J0005, and the print data creation j # I0006.
- the first seedling 0002 is a process for mapping a color gamut (Gamut).
- the pre-processing [0002] of the present embodiment is to convert 8-bit image data R, G, and B into data R, G, and B in the color gamut of the recording device 2000 by using both a three-dimensional LUT and an interpolation operation. I do.
- the three-dimensional LUT is a lookup table containing the relationship of mapping the color gamut reproduced by the sRGB standard image data R, G, and B into the color gamut reproduced by the recording device 2000 of the printing system.
- the second-stage process [0003] is a process for obtaining, on the basis of the data R, G, and B to which the color gamut mapping has been performed by the first-stage process [0002], the separation data for each ink that reproduces the color represented by this data.
- the decomposition data for each dot size i.e., the decomposition data Y, M, C, K, SC, and SM are used.
- the y complement i0004 performs a gradation value conversion on each of the separated data for each ink color and dot size obtained by the post-processing [0003]. Specifically, using a one-dimensional LUT corresponding to the gradation characteristics of the ink of each color used in the recording device 2000, the decomposition data corresponding to the ink color and the dot size is linearly converted to the gradation characteristics of the recording device 2000. Is converted to correspond to.
- Half Toung J0005 quantizes each of the 8-bit color separation data Y, M, C, K, SC, and SM and converts it to 2-bit data.
- 8-bit data is converted into 2-bit data using the error diffusion method.
- the 2-bit data is index data for indicating an arrangement pattern in a dot arrangement patterning process of the recording apparatus 2000 described later.
- the recording information creation process 0006 creates recording information by adding recording control information to the recording data containing the 2-bit index data.
- the processing of the application and the printer driver described above is performed by the CPU 1001 (see FIG. 6) according to the programs.
- the program is read from the external storage device 1007 such as the ROM 1002 or a hard disk and used, and the RAM 1003 is used as a work area when executing processing according to the program.
- the recording apparatus 2000 performs a dot arrangement patterning process # 10007 and a mask data conversion process SJ0008 for data processing.
- the dot arrangement patterning process [0007] performs dot arrangement for each pixel corresponding to an actual recording image according to a dot arrangement pattern corresponding to 2-bit index data (gradation value information) which is recording data.
- 2-bit index data grade value information
- the dots are turned on and off for a plurality of areas in the pixel, that is, Whether or not to form a dot is defined, and ejection data of “1” or “0” is arranged for each area in one pixel.
- the 1-bit ejection data thus obtained is subjected to mask processing by the mask data conversion processing 0008. That is, ejection data for each print scan of the print head 1 is generated. In multi-pass printing in which a print image in a predetermined area is completed by multiple scans of the print head 1, discharge data for each scan is generated by processing using a mask corresponding to each scan. .
- the ejection data Y, M, C, K, SC, and SM for each run are sent to the head drive circuit (head driver) 140 at appropriate timing, and the recording head 1 is driven based on the ejection data. Ink is ejected.
- the above-described dot arrangement patterning process SJ0007 and mask data conversion process [0008] in the printing apparatus 2000 are performed by a dedicated hardware circuit under the control of the CPU 101 (see FIG. 7) constituting the control unit of the printing apparatus 2000. Is performed using These processes may be executed by the CPU 101 according to a program, or executed by, for example, a printer driver in the host device 100 in the form of a personal computer (PC). In applying the present invention, the following explanatory power is clear that the form of these processes is not limited.
- a “pixel” is a minimum unit capable of expressing a gradation, and performs image processing of multi-bit multi-valued data (processing such as the above-described pre-processing, post-processing, ⁇ correction, and halftoning). Is the minimum unit of the target.
- one pixel corresponds to a pattern composed of m ⁇ n (for example, 2 ⁇ 2) cells, and each cell in this one pixel is defined as an “area”. This “area” is the minimum unit that defines the on and off of the dot.
- the “image data” referred to in the above-mentioned pre-processing, post-processing, and ⁇ correction represents a set of pixels to be processed, and each pixel is an 8-bit gradation in the present embodiment.
- This is data that contains a value.
- the “pixel data” referred to in the above-mentioned half towing represents the pixel data itself to be processed, and in the half towing of the present embodiment, the pixel data having the above-described 8-bit gradation value is used. Is converted to pixel data (index data) containing 2-bit gradation values.
- FIG. 9, FIG. 10, FIG. 11A, and FIG. 11B are diagrams illustrating a method of airflow control according to the moving speed of the recording head 1.
- the image to be recorded in a predetermined area on the recording medium is An example of so-called four-pass printing, which is completed by four scans of the print head 1, will be described.
- FIG. 9 is an explanatory diagram of a recording head used in the present example, in which a nozzle row for discharging cyan (C), magenta (M), yellow ( ⁇ ), and black (K) inks is formed.
- the nozzle rows for cyan ink ejection include nozzle rows CI and C2 for forming large dots and nozzle rows C3 and C4 for forming small dots, which are symmetric in the main running direction. Are arranged.
- the nozzle rows CI and C3 are adjacent to each other across the common liquid chamber, and the nozzle rows C2 and C4 are adjacent to each other across the common liquid chamber.
- nozzle lines Ml and M2 for forming large dots and nozzle lines M3 and M4 for forming small dots are formed.
- nozzle rows Yl and Y2 for forming large dots are formed as nozzle rows for yellow ink discharge, and similarly, nozzle rows Kl and ⁇ 2 for forming large dots are formed as nozzle rows for black ink discharge.
- a bidirectional recording can be performed in the main scanning direction indicated by the arrow ⁇ ( ⁇ 1, ⁇ 2) to record a color image.
- arrow XI is also referred to as the outward direction
- arrow ⁇ 2 is also referred to as the return direction.
- nos and nos are used in the outbound recording, and IJC1, C3, Ml, M3, Kl, K2, Yl, and Y2 are used.
- M2, M4, Kl, K2, Yl, and Y2 it is possible to match the order of ink ejection in each recording layer.
- printing is performed using all nozzle arrays during forward printing and backward printing.
- the recording speed can be increased.
- the print data is transferred to a pair of nozzle rows (a pair of nozzles for forming large dots or a pair of nozzle rows for forming small dots) of a pair of nozzle rows that eject ink droplets of substantially the same amount.
- Allocation is performed almost equally (dispersion processing) so that the recording data is not biased to one of the pair of rows.
- Power can be distributed.
- print data for forming a large dot that ejects a relatively large amount of cyan ink is developed so as to be evenly distributed to the nozzle rows CI and C2
- print data for forming a small dot that ejects a relatively small amount of cyan ink is: Nozzle row C3, C Spread evenly on 4
- the nozzle row that forms a large dot is a first nozzle row Ll
- the nozzle system IJ that forms a small dot is a second nozzle system IJL2.
- the smaller the distance between the rows of nozzles the greater the effect of the airflow between the nozzles, so the effect of the airflow between the nozzle rows arranged so as to sandwich the common liquid chamber is large.
- the influence of the airflow increases on a nozzle array with a small ink ejection amount, that is, a nozzle array with small ink droplets with small kinetic energy. Further, as the moving speed of the recording head increases, the influence of the airflow increases.
- Airflow control lines 1401, 1402, and 1403 were obtained experimentally.
- the vertical and horizontal axes indicate the number of dots formed per pixel.
- there is one large dot formation nozzle located on the same raster (R0 to R15) for each ink color, and similarly, located on the same raster (R0 to R15).
- the number of small dots for forming small dots is one for each ink color. Therefore, for example, as for the large dot formed in one pixel by the nozzle row C1, two dots on the even raster are the largest as shown in FIG. 11A, and the small dot formed in one pixel by the nozzle row C3 is As shown in FIG. 11B, two dots on the odd-numbered raster become the maximum.
- the horizontal axis in FIG. 10 is the total number of dots formed in one pixel by the nozzle rows CI and C2 as the first nozzle row L1 (maximum number 4).
- the vertical axis in 10 is the total number of dots formed in one pixel by the nozzles IJC3 and C4 as the second noise control system IJL2 (maximum number 4).
- the print data for forming large dots is evenly distributed to the nozzle rows CI and C2, and the print data for forming small dots is equally distributed to the nozzle rows C3 and C4.
- the airflow control lines 1401, 1402, and 1403 represent the ratio between the number of dots formed by the first nozzle row and the number of dots formed by the second nozzle row in one pixel.
- the airflow control line 1401 formed by the first nozzle row and the second nozzle row
- the area above the airflow control line 1401 is an NG area in which it is difficult to record a high-quality image because the influence of the airflow accompanying the ejection of ink is large.
- the area where the total number of dots formed by the first nozzle row and the second nozzle row is small that is, the area below the airflow control line 1401 is a high-quality image where the effect of airflow accompanying ink ejection is small. This is a ⁇ K area where recording is possible.
- recording must be performed based on recording data such that the number of dots formed by the first and second nozzle rows is within the white area.
- the three airflow control lines 1401, 1402, and 1403 are airflow control lines when the moving speed of the print head is different in four-pass printing.
- the moving speed of the recording head is 35 [inch / sec]
- recording data that forms dots in the area of the airflow control line 1401 is generated, and an image is recorded based on the recording data.
- the recording head moving speed is 25 [inch / sec]
- recording data for forming dots in the area of the airflow control line 1402 is generated, and an image is formed based on the recording data. Record.
- the moving speed of the recording head is 12.5 [inch / sec]
- recording data that forms dots in the area ⁇ of the airflow control line 1403 is generated, and an image is recorded based on the recording data. .
- print data is generated so as to form dots in an area corresponding to the moving speed of the print head, and an image is printed based on the print data. Therefore, irrespective of the moving speed of the recording head, it is possible to realize the recording control without the influence of the air flow.
- FIG. 12 is an explanatory diagram of a configuration example of print data for forming large dots and print data for forming small dots. These data have a mutually independent 2-bit data format.
- the recording data for forming large dots is level 1, one large dot is formed in one pixel.
- the recording data for forming small dots is level 1, one small dot is formed in one pixel. It is formed.
- the former level 1 recording data is evenly distributed to the pair of nozzle rows for forming large dots (for example, nozzle rows Cl and C2 in the case of cyan ink), and the latter level 1
- the recording data consists of a pair of nozzle arrays for forming small dots (the nozzle array for cyan ink). Sprinkled evenly on C3, C4).
- FIG. 13 is a block diagram for explaining such recording data distribution processing.
- the reception buffer 1011 receives the 2-bit quantized recording data from the host device 1000, and the dot arrangement pattern storage unit 1012 stores the dot arrangement pattern.
- the dot arrangement pattern allocation module 1013 executes the above-described dot arrangement patterning process of FIG. 8, and uses the dot arrangement pattern stored in the storage unit 1012 to add dots to the recording data in the reception buffer 1011. Assign a layout pattern.
- An expansion buffer (print buffer) 1014 expands the recording data according to the dot arrangement pattern allocated by the module 1013.
- the module 1013 is a software module stored in the ROM 103 (see FIG. 7) and executed by the CPU 101 (see FIG. 7).
- the receive buffer 1011, the storage unit 1012, and the expansion buffer 1014 are prepared in a predetermined address area of the DRAM.
- a dot arrangement pattern is assigned with a number in advance and stored.
- the dot arrangement pattern is a dot arrangement pattern that can take recording data (quantized data of levels 0 to 3) for each dot having a different size, as shown in FIG. Then, the pattern selected from those is developed into 1004 in the development buffer, and dots are formed according to the developed pattern.
- large cyan is a pattern for forming large dots using cyan ink
- small cyan is a pattern for forming small dots using cyan ink
- large magenta is a pattern for forming large dots using magenta ink
- small magenta is magenta ink.
- Large yellow is a pattern for forming large dots using yellow ink
- large black is a pattern for forming large dots using black ink.
- FIG. 14 is a flowchart for explaining data expansion processing by the dot arrangement pattern allocation module 1003.
- the recording data (2-bit quantized data) transferred from the host device 1000 is received, and the recording data is stored in the reception buffer 1001 (Step Sl). Then, the recording data for one pixel is read out from the stored recording data (step S2), and the recording is performed. A dot arrangement pattern corresponding to the recording data level (0 to 3) is selected, and the pattern is developed in the development buffer 1005 (step S3). If there are two dot arrangement patterns for the same level of recorded data, one of those forces will be selected and deployed. At that time, those two dot arrangement patterns of the same level are alternately assigned. In the case of this example, when forming small dots of cyan ink using the recording data of level 1, two patterns as shown in Fig.
- step S4 it is determined whether or not the development to the development buffer 1004 has been completed (step S4), and if not completed, the process returns to step S2.
- the data expansion processing ends.
- FIGS. 15A, 15B, 15C, 16A, 16B, and 16Cf, and FIGS. 9A and 9B show a method of generating print data corresponding to a nozzle row for forming a large dot and a nozzle row for forming a small dot.
- FIG. 15A, 15B, 15C, 16A, 16B, and 16Cf, and FIGS. 9A and 9B show a method of generating print data corresponding to a nozzle row for forming a large dot and a nozzle row for forming a small dot.
- print data that falls within the OK region of the airflow control line is generated while maintaining the gradation.
- a series of data processing including a data conversion process in the second stage seedling 0003 (see FIG. 8) as shown in FIGS. 15A, 15B, and 15C finally corresponds to each nozzle row.
- the post-processing 0003, as described above, inputs 8-bit luminance data (post-processing input data) for R, G, and B, and outputs 8-bit color separation data C, M, Y, K, SC, SM (Post-processing output data).
- FIGS. 15A, 15B, and 15C are diagrams for describing representative generation methods for C data for forming large dots using cyan ink and SC data for forming small dots using cyan ink.
- the large dots and small dots of these cyan inks are formed using adjacent nozzle rows (nozzle rows CI (L1) and C3 (L2) or C2 (L1) and C4 (L2) in FIG. 9). Is done.
- G and B data are fixed to (255) out of 8-bit data of R, G, and B for convenience of explanation.
- the post-processing input data (R, G, B) with respect to the horizontal axis of these figures that is, R, G, B, is G
- the change of the R data (hue change) when the B data is (255).
- the horizontal axis shows the range from white (255, 255, 255) to cyan (0, 255, 255) with the maximum density.
- the vertical axis of these figures indicates the value of the post-processing output data (C, SC) of 8 bits.
- the method of data conversion by the post-processing [0003] differs depending on the moving speed of the recording head. In the case of this example, when the moving speed of the recording head is 35 [inches / second], 25 [inches / second], and 12.5 [inches / second], respectively, FIG. 15A, FIG. Data conversion as follows.
- FIG. 15A is an explanatory diagram of the post-processing performed when the recording mode in which the moving speed of the recording head is 35 [inches / second], which is the fastest, is specified.
- the post-processing input data is within the range of (255, 255, 255) to (160, 255, 255)
- only SC data is output so that image formation is performed only with small cyan dots.
- SC data is output so that the number of small command dots gradually increases.
- the output value of the SC data becomes maximum (about 128).
- the number of small dots formed at the maximum output value (128) is “2” as shown in FIG. 16A. This “2” is located below the airflow control line 1401 in FIG. Therefore, no airflow problem occurs.
- the output value of the SC data becomes 0 and the output value of the C data becomes about 100.
- the number of formed dots is “0” for small dots and “1.7” for large dots (see Fig. 16A).
- the number of formed small dots is “0” and the number of formed large dots is “1.7”, FIG. It is located below the ten airflow control lines 1401. Therefore, no airflow problem occurs.
- FIG. 15A if the post-processing input data is in the range of (44, 255, 255)-(0, 255, 255), the C data Output only.
- C data is output so that the number of large cyan dots formed gradually increases.
- the output value of C data becomes maximum (about 128).
- the number of large dots formed at this maximum output value (128) is “2” as shown in FIG. 16A, and this “2” is located below the airflow control line 1401 in FIG. Therefore, no airflow problem occurs.
- FIG. 15C is an explanatory diagram of the post-processing performed when the recording mode of 12.5 [inch / second] where the moving speed of the recording head is the lowest is designated.
- the range of post-processing input data in which the formation of small dots is allowed is wider than that in FIG. 15A.
- the gradation range in which small dots can be used is widened, which is advantageous in reducing the graininess in the highlight portion.
- the maximum formation number of small dots / the maximum formation number of large dots is increased compared to FIG. 15A, so that the density range that can be expressed is wide.
- the maximum total number of large and small dots in the case where small dots and large dots are mixed in the unit area is larger than that in FIG. 15A.
- Figure 15C is less affected by the airflow than in the case of Figure 15A.
- the maximum number of large dots and small dots can be increased.
- the output value of the SC data is gradually increased.
- the output value of the SC data becomes maximum (about 256).
- the number of small dots formed at this maximum output value (256) is a force that becomes “4” as shown in FIG. 16C. This “4” is located below the airflow control line 1403 in FIG. Therefore, no airflow problem occurs.
- the SC data output value will be maximized (approximately 256). While maintaining, gradually increase the C data.
- the post-processing input data becomes (116, 255, 255)
- the number of small dots formed is “4”
- the number of large dots formed is “1” as shown in FIG. 16C. Since this combination of the number of dots is located below the airflow control line 1403 in FIG. 10, no airflow problem occurs.
- the C data is output while the SC data output value is gradually reduced. Data output value is gradually increased.
- the post-processing input data reaches (64, 255, 255)
- the output values of both the SC data and C data become (about 128).
- the number of small dots formed and the number of large dots formed are both “2” (see FIG. 16C). Since this combination of dot numbers is located below the airflow control line 1403 in FIG. 10, no airflow problem occurs.
- the output value of C data becomes maximum (about 255).
- the number of large dots formed at this maximum output value (255) is “4” as shown in FIG. 16C, and this “4” is located below the airflow control line 1403 in FIG. Therefore, no airflow problem occurs.
- the influence of the airflow is relatively small. It is loose. Specifically, the printing corresponding to the large dot nozzle row and the small dot nozzle row is performed so that the number of large dots and small dots formed falls within the vast OK area below the recording control line 1403 in FIG. Generating data. By doing so, the influence of airflow when the moving speed of the recording head is slow is suppressed.
- an image is printed on a print medium by ejecting ink from a print head based on the print data. Record.
- FIGS.16A, 16B, and 16C show the recording of large dots and small dots by cyan ink based on recording data generated by a series of data conversion processes including the processes of FIGS.15A, 15B, and 15C.
- FIG. 3 is an explanatory diagram in a case where the recording medium is formed on a medium.
- the horizontal axis in these figures is the post-processing input data (R, G, B) in the post-processing 0003, similar to the horizontal axes in FIGS. 15A, 15B, and 15C.
- the left vertical axis represents the number of large dots and small dots formed per unit recording area on the recording medium, and the right vertical axis represents the total applied amount of cyan ink per unit recording area [pi ( Picoliter)], that is, the total ejection amount of cyan ink for forming large dots and small dots.
- FIGS. 15A to 15C What is common to FIGS. 15A to 15C is that when the post-processing input data is in a low density area (for example, in the range of (255, 255, 255) to (200, 255, 255)), An image is recorded using only small dots in consideration of the granularity of the highlight portion. The number of small dots to be formed is gradually increased as the post-processing input data becomes larger to increase the recording density. When the post-processing input data is equal to or larger than the halftone level area, it is more efficient to form large dots in order to obtain the required recording density. If an image is recorded using only small dots, the landing accuracy when small ink droplets for forming small dots land on the recording medium will deteriorate, depending on the number of passes in the multi-pass printing method.
- the halftone level area an image is formed by mixing small dots and large dots.
- the recording ratio of the nozzles IJ for forming large dots and the row of nozzles for forming small dots is changed. Form more dots than small dots.
- print data is generated as described above in consideration of the influence of airflow, the landing accuracy of small ink droplets, and the granularity of a print image when a large dot starts to be formed.
- the print data is generated in consideration of the influence of the airflow that varies depending on the moving speed of the print head, it is possible to print a good image.
- the RGB input image data is processed by the first-stage processing # 11003. Convert to C, M, Y, K, SC, SM recording data. For example, by providing a table associating input / output data as shown in FIG. 15A, FIG. 15B, and FIG. 15C for each moving speed of the recording head, such a table Can be used to perform data conversion as described above.
- print data is generated to control the number of dots formed per unit area (per pixel in the above example) formed by a plurality of adjacent nozzle rows according to the moving speed of the print head.
- it is possible to suppress the influence of the air flow due to mutual ink ejection.
- the effect of airflow between adjacent nozzle rows changes according to the moving speed of the recording head. Therefore, by generating print data according to the moving speed and controlling the ejection amount of ink ejected from those nozzle arrays, optimal control for printing using a plurality of nozzle arrays is performed to achieve high image quality. Images can be recorded. Close to each other Controlling the amount of ink ejected from the nozzle array also controls the ratio of the amount of ink ejected from those nozzle arrays.
- the number of recording passes of the present invention is not limited to “4”.
- the number of recording passes (N) of the present invention may be an integer, and can be applied to various numbers of passes such as one pass, two passes, and eight passes.
- the present invention is not limited to such a form.
- the present invention can be applied to a form in which only a single dot can be recorded for the same color. In this case, it is only necessary to have at least two nozzle rows for ejecting the same color ink, and to generate print data corresponding to the moving speed of the print head for those nozzle rows.
- the present invention is also applicable to a mode using similar color inks (for example, light cyan ink and dark cyan ink).
- the relationship between the large dot and the small dot described above is applied to the dark dot and the light dot, and print data corresponding to the moving speed of the print head is generated for the dark ink nozzle row and the light ink nozzle row. Just fine.
- the ink discharge amount (ink) (Corresponding to the number of droplets ejected) can also be controlled.
- the flying distance of the ink droplet increases, the flying speed of the ink droplet decreases, and its kinetic energy decreases. Accordingly, print data is generated so that the influence of the airflow is more strongly suppressed as the sheet-to-sheet distance increases, and as a result, the ejection amount of ink from the adjacent nozzle array is controlled. For example, consider the case where the head moving speed is 12.5 [inch / sec]. In this case, as the inter-sheet distance increases, the ⁇ K area of the airflow control line 1403 in FIG. 10 is narrowed, and data processing is performed so that large dots and small dots are formed in the narrow and OK areas.
- the recording data is set so as to suppress the effect of airflow on those nozzle rows C3 and Ml. Can be generated, and consequently the amount of ink ejected from those nozzle arrays C3 and Ml can be controlled. In that case, the ink droplets are small and In consideration of the great influence of the airflow on the nozzle row located on the side, the print data can be generated so as to control the ink ejection amount and avoid the influence.
- print data when the print data is generated to perform the above-described ejection amount control on the nozzles IJC2 and C4, for example, during forward printing in which the print head moves in the direction of arrow XI in FIG.
- print data may be generated so as to limit the amount of ink from the adjacent nozzle IJC4 in consideration of the presence of the nozzle array M2.
- print data can be generated such that the ejection amount for suppressing the effect of airflow is controlled for nozzle rows adjacent to each other.
- print data is generated to control the amount of ink ejected per unit area (corresponding to the number of ejected ink droplets), thereby suppressing the effects of airflow.
- the recording data is generated in consideration of the airflow effect. It is possible to obtain the effect of
- the present invention when an image is printed by designating a plurality of recording modes in which the moving speed of the recording head is different, ejection is performed per unit area from a plurality of nozzle arrays according to the designated recording mode. It suffices if print data with different ink ejection amounts can be generated. That is, it suffices if image data corresponding to a plurality of print modes having different moving speeds of the print head can generate print data capable of avoiding the influence of airflow.
- the recording data can be generated by converting input image data indicating a predetermined luminance level. (Other)
- a software program for realizing the functions of the above-described embodiments is directly or remotely supplied to a system or a device, and a computer of the system or device reads and executes the supplied program code. This includes cases where this can also be achieved. In that case, the form need not be a program as long as it has the function of the program.
- the program code itself installed in the computer to implement the functional processing of the present invention by the computer also implements the present invention. That is, the present invention
- the claims include the computer program itself for implementing the functional processing of the present invention.
- a storage medium for supplying the program for example, a flexible disk, hard disk, optical disk, magneto-optical disk, M ⁇ ⁇ , CD-ROM, CD-R, CD-RW, magnetic tape, non-volatile memory
- ROM read-only memory
- DVD-ROM DVD-read-only memory
- Other methods of supplying the program include connecting to a homepage on the Internet using a browser of a client computer, and using the homepage power, the computer program itself of the present invention, or a compressed file containing an automatic installation function on a hard disk. It can also be supplied by downloading to a storage medium such as.
- the present invention can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage.
- a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the scope of the present invention.
- the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and sent to a user who meets predetermined conditions from a home page via the Internet. It is also possible to download key information for unlocking the key and execute the encrypted program by using the key information to install the program on a computer.
- the functions of the above-described embodiments are implemented when the computer executes the read program, and the actual processing such as the OS running on the computer is performed based on the instructions of the program.
- the functions of the above-described embodiments can be realized by partially or entirely performing the processing.
- the program read from the storage medium is written to a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, based on the instructions of the program, a CPU or the like provided in the function expansion board or the function expansion unit performs a part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.
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US8622502B2 (en) * | 2007-12-13 | 2014-01-07 | Canon Kabushiki Kaisha | Ink jet printing apparatus and ink jet printing method |
JP5171321B2 (ja) | 2008-03-07 | 2013-03-27 | キヤノン株式会社 | 画像処理装置および画像処理方法 |
US8235484B2 (en) * | 2008-05-28 | 2012-08-07 | Ray Paul C | Printbar support mechanism |
CN102239054B (zh) * | 2008-12-03 | 2014-02-12 | 录象射流技术公司 | 喷墨打印***和方法 |
JP2010162882A (ja) * | 2008-12-19 | 2010-07-29 | Canon Inc | インクジェット記録装置およびインクジェット記録方法 |
CN102700278B (zh) * | 2012-07-08 | 2015-01-21 | 盐城工学院 | 一种织物上喷花的方法、装置和设备 |
JP6417588B2 (ja) * | 2014-10-16 | 2018-11-07 | セイコーエプソン株式会社 | ノズル列駆動データ変換装置および液滴吐出装置 |
JP7094812B2 (ja) * | 2018-07-17 | 2022-07-04 | キヤノン株式会社 | 記録装置、記録方法、およびプログラム |
CN110865779B (zh) * | 2019-11-15 | 2024-02-09 | 深圳市汉森软件股份有限公司 | 单喷头多色打印的数据提取方法、装置、设备及存储介质 |
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JP3339724B2 (ja) * | 1992-09-29 | 2002-10-28 | 株式会社リコー | インクジェット記録方法及びその装置 |
JP2004098464A (ja) * | 2002-09-09 | 2004-04-02 | Canon Inc | インクジェット記録方法、記録システム、インクジェット記録装置、記録データ生成方法、プログラム及びプリンタドライバ |
JP2004142452A (ja) * | 2002-10-03 | 2004-05-20 | Canon Inc | インクジェット記録方法及び装置、プログラム |
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JP3339724B2 (ja) * | 1992-09-29 | 2002-10-28 | 株式会社リコー | インクジェット記録方法及びその装置 |
JP2004098464A (ja) * | 2002-09-09 | 2004-04-02 | Canon Inc | インクジェット記録方法、記録システム、インクジェット記録装置、記録データ生成方法、プログラム及びプリンタドライバ |
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