WO2015186499A1 - Appareil de formation d'image et procédé de formation d'image - Google Patents

Appareil de formation d'image et procédé de formation d'image Download PDF

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Publication number
WO2015186499A1
WO2015186499A1 PCT/JP2015/064176 JP2015064176W WO2015186499A1 WO 2015186499 A1 WO2015186499 A1 WO 2015186499A1 JP 2015064176 W JP2015064176 W JP 2015064176W WO 2015186499 A1 WO2015186499 A1 WO 2015186499A1
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WIPO (PCT)
Prior art keywords
nozzles
defective
nozzle
defective nozzle
test pattern
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Application number
PCT/JP2015/064176
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English (en)
Japanese (ja)
Inventor
敏幸 水谷
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コニカミノルタ株式会社
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Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Priority to JP2016525753A priority Critical patent/JP6388027B2/ja
Publication of WO2015186499A1 publication Critical patent/WO2015186499A1/fr

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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
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/46—Applications of alarms, e.g. responsive to approach of end of line

Definitions

  • the present invention relates to an image forming apparatus and an image forming method using an ink jet recording method.
  • an ink jet type image forming apparatus (ink jet recording apparatus) that forms an image on a recording medium such as printing paper by ejecting ink from a large number of nozzles.
  • This image forming apparatus includes an ejection unit in which a large number of fine nozzles are provided in the main scanning direction corresponding to the resolution of an output image. Therefore, if ink cannot be ejected from each nozzle due to nozzle clogging or malfunction, the formed image has linear unevenness and blurring extending in the sub-scanning direction.
  • test pattern a test print image composed of ejection dots of all nozzles.
  • nozzle missing a part of the pattern is chipped.
  • Patent Document 1 since the image forming apparatus of Patent Document 1 does not compensate for missing nozzles at the time of test pattern formation, identification of defective nozzles targeting all defective nozzles relative to the test pattern and storage of specific data in the storage means are performed. It is necessary to execute data processing such as this every time, and there is a problem that the processing load and processing time of the defective nozzle detection processing increase.
  • An object of the present invention is to provide an image forming apparatus and an image forming method capable of reducing the processing load and processing time of defective nozzle detection processing.
  • An image forming apparatus that forms an image with an inkjet head that ejects ink from a plurality of nozzles onto a recording medium conveyed in a predetermined conveyance direction, A defective nozzle storage unit that stores specific data for identifying defective nozzles in a defective ejection state among the nozzles of the inkjet head; An image forming control unit that controls the ink jet head so as to form an image by complementing nozzles identified as defective nozzles in the defective nozzle storage unit by alternative ejection by other nozzles around the nozzles.
  • the image formation control unit is configured to form a first test pattern for detecting a defective nozzle other than a nozzle identified as a defective nozzle in the specific data, in which a dot formation position is determined for each of the plurality of nozzles.
  • the inkjet head is controlled to perform the complementation for the nozzles identified as defective nozzles in the specific data.
  • the inkjet head is a full line type.
  • the image forming apparatus in the image forming apparatus according to any one of the first to third aspects, It has an input part which receives the input of the detection result of defective nozzles other than the nozzle specified as the defective nozzle in the specific data from the user who visually recognized the first test pattern.
  • the invention according to claim 5 An image forming method in which an image is formed by an inkjet head that discharges ink from a plurality of nozzles to a recording medium conveyed in a predetermined conveyance direction, A specifying step for specifying which of the plurality of nozzles is a defective nozzle from specific data for specifying a defective nozzle in a defective discharge state among the nozzles of the inkjet head; A dot formation position is defined for each of the plurality of nozzles, and formation data of a first test pattern for detecting defective nozzles other than nozzles identified as defective nozzles in the specific data is defined as defective nozzles in the specific data. A correction process for correcting the identified nozzle to a content that is complemented by alternative discharge by other nozzles around the nozzle, And a pattern forming step of controlling the inkjet head so as to form the first test pattern.
  • the invention according to claim 7 is the image forming method according to claim 6, In the obtaining step, information for identifying the defective nozzle is acquired from a second test pattern formed without performing the supplementation for the nozzle identified as the defective nozzle by the specific data.
  • the invention according to claim 8 is the image forming method according to claim 7, Information for specifying the defective nozzle is acquired by reading the second test pattern with an image reading device.
  • the invention according to claim 9 is the image forming method according to any one of claims 5 to 8, By visually recognizing the first test pattern, a defective nozzle other than a nozzle identified as a defective nozzle in the specific data is detected.
  • FIG. 1 is a diagram illustrating an overall configuration of an inkjet recording apparatus according to an embodiment of the present invention. It is a block diagram which shows the control system of an inkjet recording device. It is a bottom view which shows the opposing surface with the recording medium of an inkjet head. It is explanatory drawing which shows the formation image of the 2nd test pattern for ejection defect detection. It is explanatory drawing which shows the formation image of the 1st test pattern for ejection defect detection. It is a figure which shows an example of the discharge condition of the ink in which the defect location by a defective nozzle exists. It is a figure which shows an example of the discharge condition of the ink by which conditions were changed so that a missing part might be compensated. It is a flowchart which shows the formation operation of a 1st test pattern. It is a flowchart which shows the update process of a defective nozzle memory
  • FIG. 1 is a diagram illustrating an overall configuration of an inkjet recording apparatus 100 as an image forming apparatus according to the present embodiment.
  • FIG. 2 is a block diagram illustrating the internal configuration of the inkjet recording apparatus 100.
  • the inkjet recording apparatus 100 includes a transport unit 11, an inkjet head 12, a control unit 14 (image formation control unit), an operation display unit 15, and the like.
  • the transport unit 11 includes a transport belt 112 and a transport motor 111 that moves the transport belt 112 around.
  • the recording medium P arranged on the conveyance belt 112 moves in a predetermined conveyance direction by the rotation operation of the conveyance motor 111.
  • the conveyance unit 11 may be configured to move the recording medium P arranged on the surface of the conveyance drum in the rotation direction by rotating the cylindrical conveyance drum.
  • the inkjet head 12 includes a plurality of nozzles whose openings are arranged facing the conveyance surface of the recording medium P, a drive circuit 121, and an ink discharge unit 122.
  • the ink discharge unit 122 is operated by the drive voltage output from the drive circuit 121 based on the control signal from the control unit 14, so that the timing is controlled and the ink is discharged from the openings of the plurality of nozzles.
  • the An image is formed by landing on the recording medium P on which the ejected ink is conveyed.
  • the inkjet head 12 is not particularly limited, but is a full-line type head here, and ejects ink over the width in which the recording medium P can form an image in the width direction perpendicular to the transport direction.
  • the nozzles are arranged as possible.
  • the inkjet head 12 is individually provided for each of four colors, for example, Y (yellow), M (magenta), C (cyan), and K (black). In FIG. 2 and FIG. 2, only one inkjet head 12 is shown.
  • FIG. 3 is a bottom view showing a surface (bottom surface) facing the recording medium P in the K (black) inkjet head 12.
  • the Y (yellow), M (magenta), and C (cyan) inkjet heads have the same configuration.
  • a plurality of head modules 120 are arranged in a staggered arrangement in the width direction.
  • a plurality of nozzles are arranged in each of the head modules 120, and the nozzles provided at the end portions in the width direction are the positions in the width direction of the nozzles provided at the end portions in the width direction of the other head modules 120.
  • the nozzles that eject ink of each color are arranged, for example, at 1200 dpi (dot per inch) in the width direction, that is, the interval (nozzle pitch) in the width direction of adjacent nozzles is about 21 ⁇ m.
  • the size (diameter) of dots (landing range) formed when ink droplets ejected from one nozzle land on the recording medium P is about 60 ⁇ m. That is, the landing ranges on the recording medium P of ink ejected from adjacent nozzles overlap each other.
  • the control unit 14 includes a memory 141, a CPU (Central Processing Unit) 142, a ROM (Read Only Memory) 143, a RAM (Random Access Memory) 144, etc., which are connected to a bus 145.
  • the control unit 14 is connected to an external print server, an electronic computer such as a personal computer (PC), a storage device, and a scanner device (not shown) for image reading via the communication unit 16, and print jobs and prints. Transmission / reception of target image data or read image data is performed.
  • the memory 141 temporarily stores image data input from an external computer, storage device, or scanner device.
  • the memory 141 stores, in a table, specific data for specifying the nozzle arrangement of a nozzle (defective nozzle) identified as a defective discharge by inspection among a plurality of nozzles of the inkjet head 12 and a complementary setting for performing complementary discharge described later.
  • the defective nozzle storage unit 141a is included.
  • the CPU 142 performs overall control of the overall operation of the inkjet recording apparatus 100 and performs various arithmetic processes.
  • the CPU 142 outputs control signals to the transport unit 11 and the inkjet head 12 according to the program read from the ROM 143, and performs various processes related to image formation.
  • the CPU 142 may be controlled centrally by one processor, or may be an individual processor specialized for various control processes such as transport control of the recording medium P by the transport unit 11 and drive control of the inkjet head 12. It may be provided.
  • the ROM 143 stores a control program related to image formation and initial setting data.
  • the CPU 142 reads out a control program and executes it on the RAM 144, or refers to initial setting data.
  • the initial setting data includes test image data 143a for forming a test pattern according to the contents of nozzle inspection and adjustment.
  • the RAM 144 provides a working memory space to the CPU 142 and stores temporary data.
  • the RAM 144 temporarily stores read image data acquired from the scanner device and a first test pattern described later.
  • the operation display unit 15 includes a display panel that performs display according to a control signal from the CPU 142, and an operation key that receives an input operation from the outside. Also, execution of image formation of a first test pattern Ta described later can be input from this operation key.
  • the operation key of the operation display unit 15 also functions as an input unit for inputting detection results (described later) of defective nozzles other than the nozzles identified as defective nozzles in specific data from the user who has visually recognized the first test pattern. To do.
  • the display panel is not particularly limited, but is a liquid crystal display (LCD), for example.
  • a touch sensor that is stacked on the LCD panel may be used as a touch panel so that display and operation reception can be used together.
  • Test pattern Next, the operation of forming a test pattern for performing an ink ejection defect inspection of nozzles in the inkjet recording apparatus 100 of the present embodiment will be described.
  • the control unit 14 controls the inkjet head 12 to form an image of the first test pattern Ta obtained by applying a predetermined correction process to the second test pattern T based on the test image data 143a.
  • the image formation of the first test pattern Ta is performed for each of the colors Y, M, C, and K. Since the contents are the same, only one color will be described.
  • FIG. 4A shows an example of a formed image of the second test pattern T suitable for reading by the optical sensor (reading device) of the scanner device in order to detect all ejection failure nozzles
  • FIG. 2 shows an example of a formed image of a first test pattern Ta suitable for detecting a nozzle with a poor ejection failure.
  • the symbol W is a direction orthogonal to the conveyance direction of the recording medium P, that is, the width direction of the recording medium P
  • the symbol H indicates the conveyance direction of the recording medium P.
  • a plurality of vertical lines Lh along the transport direction H are formed at uniform intervals in the width direction W of the recording medium P.
  • the vertical lines Lh are formed at intervals of n times the nozzle pitch in the width direction W (n is the number of vertical lines Lh arranged in the second test pattern T along the transport direction H).
  • Each vertical line Lh is formed offset in the width direction by one nozzle pitch from another vertical line Lh adjacent in the transport direction H.
  • the vertical lines Lh are formed in the same number as all the nozzles of the inkjet head 12, and each vertical line Lh individually corresponds to each nozzle one to one. For this reason, when any of the nozzles is a defective nozzle, the corresponding vertical line Lh is not formed, and a blank area B is generated. Since each vertical line Lh is arranged with regularity corresponding to the order of arrangement of the nozzles, it is possible to specify from which position of the blank area B the nozzle arranged in the inkjet head 12 is in an ejection failure state. it can.
  • the inkjet head 12 tends to gradually increase the number of defective nozzles due to clogging or the like by repeating discharge. Therefore, defective nozzles are detected by reading with a sensor or visually recognized by the user with respect to the second test pattern T that does not compensate for missing nozzles when forming a test pattern, and identifying defective nozzles for all defective nozzles or defective nozzles When data processing such as storage of specific data in the storage unit 141a is performed every time, there is a problem that the processing load and processing time of the defective nozzle detection processing increase. Further, as shown in FIG.
  • the control unit 14 corrects the second test pattern T by the CPU 142 executing the correction program stored in the ROM 143, and newly generates test image data of the first test pattern Ta.
  • the control unit 14 reads out the latest defective nozzle identification data stored in the defective nozzle storage unit 141a and its complementary setting. Then, the control unit 14 changes the content that forms the vertical line Lh by the nozzles identified as defective nozzles in the setting content of the test image data 143a that forms the second test pattern T to the surrounding nozzles (for example, both adjacent sides).
  • the image data rewritten with the content supplemented by the alternative discharge by the nozzles of No. 4) is developed in the RAM 144.
  • a complementary parameter 143b that is setting information for performing alternative discharge (supplementary discharge) of a nozzle identified as a defective nozzle is prepared in the ROM 143 in advance. With this complementary parameter 143b, it is possible to determine the nozzle that performs complementary discharge and its discharge amount.
  • This complementary parameter is a dedicated complementary parameter for forming the first test pattern Ta from the second test pattern T, and in order to reduce the influence of defective nozzles when a normal image other than the first test pattern Ta is formed. There are two types of complementary parameters.
  • first complementary parameter 143b a dedicated complementary parameter for forming the first test pattern Ta from the second test pattern T
  • second complementary parameter 143c complementary parameters used for normal image formation other than the first test pattern Ta
  • the dots D ejected around E the conditions relating to the ejection of ink from the nozzles are changed so as to compensate for the missing portion E. That is, as shown in FIG. 5B, the missing portion E is compensated by increasing the amount of ink of the dots D ejected around the missing portion E. Thereby, the influence which the defect location E by a defective nozzle has on image quality can be reduced.
  • FIG. 4B shows the first test pattern Ta in which the second test pattern T is corrected by complementary discharge based on the first complementary parameter 143b.
  • the vertical line Lha is formed by complementary discharge by other peripheral nozzles for the nozzles already specified as defective nozzles in the defective nozzle storage unit 141a. Therefore, it does not become the blank area B.
  • the vertical line Lha is formed by the nozzle adjacent to one side of the nozzle identified as the defective nozzle.
  • the complementary is performed when the user visually recognizes the first test pattern Ta.
  • the vertical line Lha formed by the discharge can be sufficiently approximated to the vertical line Lh to be formed by the original nozzle.
  • the blank area B generated in the first test pattern Ta is only a new defective nozzle not specified in the defective nozzle storage unit 141a. For this reason, the generation density of the blank areas B in the first test pattern Ta is sufficiently reduced, and the blank areas B can be easily found by visual recognition. That is, the first test pattern Ta is suitable for detecting defective nozzles other than the nozzles identified as defective nozzles in the specific data stored in the defective nozzle storage unit 141a.
  • the image formation of the first test pattern Ta is performed in response to an execution instruction input from the operation display unit 15 by the user.
  • the control unit 14 acquires the defective nozzle identification data from the defective nozzle storage unit 141a and identifies the defective nozzle (step S1: identification process).
  • Step S3 Correction step
  • the control unit 14 controls the inkjet head 12 to form the first test pattern Ta on the recording medium P based on the corrected test image data 143a (step S5: pattern formation process).
  • the user visually checks the first test pattern Ta formed on the recording medium P and confirms whether or not the blank area B exists.
  • the blank area B exists it means that a new defective nozzle not specified in the defective nozzle storage unit 141a has occurred, and the user inputs from the operation display unit 15 that a new defective nozzle has occurred.
  • the control unit 14 waits for an input for the generation of a defective nozzle from the operation display unit 15 (step S7), and ends the image forming process if there is no input for a certain period of time. Further, when receiving the input of the generation of a defective nozzle from the operation display unit 15, the control unit 14 controls the inkjet head 12 and based on the uncorrected test image data 143a, the second test pattern T. Is formed on the recording medium P (step S9), and the image forming process is terminated.
  • the second test pattern T formed by the generation of the defective nozzle is formed in a state where blank regions B are generated due to all the defective nozzles existing at the time of image formation. Since the inkjet recording apparatus 100 is not equipped with a sensor as an image reading apparatus for reading the second test pattern T, the user can use the recording medium P on which the second test pattern T is formed as an image reading apparatus.
  • the data is read by an external scanner device, and the read data is transferred to the control unit 14 via the communication unit 16. Thereby, the control unit 14 acquires the read image data of the second test pattern T (step S21).
  • the control unit 14 When acquiring the read image data of the second test pattern T, the control unit 14 performs image analysis (step S23: acquisition step). That is, the control unit 14 reads the luminance value in the width direction W with respect to the read image data of the second test pattern T, and detects the vertical line Lh and the blank area B. As a detection method, since the luminance value is reduced in the vertical line Lh, it is possible to determine a portion that is equal to or less than a predetermined threshold value as the vertical line Lh. In the blank area B, an area that is white (the background color of the recording medium P) is almost twice the pitch of the vertical line Lh in the width direction W, and therefore a portion that is larger than a predetermined threshold is in the width direction.
  • a portion of W that continues for a predetermined length can be determined as a blank area B. Further, the control unit 14 can specify which nozzle of the inkjet head 12 corresponds to each detected vertical line Lh and blank area B from the arrangement order of the width direction W in each vertical line Lh. It is.
  • the control unit 14 can specify all nozzles corresponding to all the blank regions B, and obtain the specific data of defective nozzles. That is, the control unit 14 functions as an “acquisition unit” that acquires information for specifying a defective nozzle. Further, the above analysis corresponds to an acquisition process for acquiring information for specifying a defective nozzle.
  • blank areas B are generated for all nozzles that are defective nozzles at the time of formation, so that it is possible to identify defective nozzles regardless of the presence or absence of specific data for the defective nozzle storage unit 141a. it can. For this reason, the recovery can be detected not only for newly generated defective nozzles but also for nozzles that have returned from the defective nozzle state to the normal state.
  • the control unit 14 updates all the defective nozzle identification data stored in the defective nozzle storage unit 141a with the defective nozzle identification data obtained by the analysis of the second test pattern T (step S25: update processing). Process).
  • the control unit 14 refers to the first complementary parameter 143b in the ROM 143, determines a complementary setting (nozzle for performing complementary discharge) for each defective nozzle, and stores the defective nozzle in association with the specific data of the defective nozzle. It memorize
  • the control unit 14 uses the specific data in the defective nozzle storage unit 141a in normal image formation (for example, general image formation excluding specific-purpose image formation such as test patterns T and Ta).
  • the inkjet head 12 and the transport unit 11 are controlled so that image formation is performed by complementary ejection using the second complementary parameter 143c. For this reason, it is possible to suppress a decrease in image quality due to a defective nozzle.
  • control unit 14 complements the nozzles identified as defective nozzles by the specific data of the defective nozzle storage unit 141a with the first complement parameter 143b so as to form the first test pattern Ta and the inkjet head 12 and The transport unit 11 is controlled. For this reason, the new defective nozzles not specified in the defective nozzle storage unit 141a are not complemented, and the blank area B based only on the new defective nozzles is formed in the first test pattern Ta. Therefore, compared to the second test pattern T in which the blank area B is formed for all the defective nozzles, it is possible to immediately recognize the occurrence of a new defective nozzle by visual recognition. Therefore, only when new defective nozzles are found by visual recognition, it is only necessary to execute data processing such as identification of defective nozzles targeting all defective nozzles and storage of specific data in the storage means. It is possible to reduce processing load and processing time.
  • the inkjet head 12 is a full line type and includes a large number of nozzles, the frequency of occurrence of defective nozzles increases according to the number of nozzles, and the burden of detecting defective nozzles increases. Therefore, it is possible to reduce the processing load and the processing time of the defective nozzle detection process particularly preferably for such a full-line type ink jet head 12.
  • the control unit 14 when acquiring the read image data of the second test pattern T, the control unit 14 performs image analysis and acquires specific data of the defective nozzle. Then, the control unit 14 updates all the defective nozzle identification data specified in the defective nozzle storage unit 141a to the defective nozzle identification data obtained by the analysis of the second test pattern T. As a result, even when the occurrence situation such as an increase in the number of defective nozzles or a change in position fluctuates, it is possible to follow the above and maintain the specific data of the defective nozzles in the defective nozzle storage unit 141a in a more accurate state. It becomes.
  • the control unit 14 may execute image formation of the first test pattern Ta periodically, or when a certain condition is satisfied (for example, when the main power is turned on or off). May be.
  • the first test pattern Ta is set so that the length of the vertical line Lh and the interval between the vertical lines Lh in the width direction W are set sufficiently long so that the user can find the blank area B visually. Visibility may be improved. Since the interval between the vertical lines Lh in the width direction W is n times the nozzle pitch (n is the number of the vertical lines Lh in the conveyance direction H), the interval is increased by increasing the number of the vertical lines Lh in the conveyance direction H. Can be widened.
  • the inkjet recording apparatus 100 acquires read image data of the second test pattern T read by the external scanner device from the communication unit 16 in order to acquire defective nozzle identification information. Reading of the test pattern T is not limited to this method.
  • the ink jet recording apparatus 100 includes a line sensor or an area sensor provided on the downstream side in the transport direction of the ink jet head 12 so that the entire width of the image forming range can be optically read, thereby reading the second test pattern T.
  • the control unit 14 may perform analysis and data processing of the defective nozzle.
  • the recording medium on which the first test pattern Ta is formed is configured to be read by the user's visual recognition without being read by the sensor so that the sensor does not read the first test pattern Ta. It may be.
  • reading of the 2nd test pattern T is not limited to a sensor or a scanner.
  • the user visually checks the second test pattern T formed on the recording medium P and confirms whether or not the blank area B exists, and if the blank area B exists, the user displays a defect from the operation display unit 15. Information for specifying a nozzle may be input.
  • the reading of the second test pattern T may be selectively performed by either a user's visual recognition or a reading device.
  • the user-friendliness may be improved by selecting one of them according to a user instruction from the operation display unit 15 and executing reading.
  • the said inkjet recording device 100 illustrated the preferable form which reads the 1st test pattern Ta by visual recognition by a user
  • the reading of the 1st test pattern Ta is not limited to visual recognition.
  • the ink jet recording apparatus 100 includes a line type sensor or an area sensor provided on the downstream side in the transport direction of the ink jet head 12 so that the entire width of the image forming range can be optically read, thereby reading the first test pattern Ta.
  • the control unit 14 may analyze a newly generated defective nozzle or may be read by a scanner.
  • the reading of the first test pattern Ta may be selectively performed by either visual recognition or a reading device.
  • both the first test pattern Ta and the second test pattern T may be read by the user's visual recognition. This eliminates the need for a sensor or scanner reading device and simplifies the device configuration. In any of the above cases, the occurrence of a new defective nozzle can be easily recognized by the first test pattern Ta. Therefore, the second test pattern T is read and processed only when a new defective nozzle is generated. The frequency can be minimized. Therefore, also in this case, it is possible to reduce the processing load and processing time of the detection process.
  • the second test is not necessarily performed.
  • the formation and reading of the pattern T may not be performed.
  • the defective nozzle storage unit 141a does not store defective nozzle specific data at the time of shipment or start-up of the inkjet recording apparatus 100
  • the formation and reading of the second test pattern T is performed first, and all A defective nozzle is detected, and specific data is stored in the defective nozzle storage unit 141a.
  • the defective nozzle specifying data is not stored in the defective nozzle storage unit 141a even if the second test pattern T is formed and read.
  • a new defective nozzle is detected by the second test pattern T in a state without complement.
  • the specific data is stored in the defective nozzle storage unit 141a
  • a new defective nozzle is detected by the complemented first test pattern Ta.
  • the acquisition of the specific information of the defective nozzle may be performed by a method other than the reading of the second test pattern T.
  • optical elements that detect the ink droplets passing through the ejection path of the ink ejected from each nozzle of the inkjet head 12 are arranged side by side, and the passage of the droplets during the ejection operation of each nozzle is performed. The presence or absence may be detected.
  • the occurrence of a new defective nozzle can be easily recognized by the first test pattern Ta, and the frequency of the droplet passing through the optical element only needs to be confirmed when the new defective nozzle is generated. Can be minimized. Therefore, also in this case, it is possible to reduce the processing load and processing time of the detection process.
  • the present invention can be used for an image forming apparatus and an image forming method.
  • Conveyance unit 12 Inkjet head 14 Control unit (image formation control unit, acquisition unit, update processing unit) 15 Operation display section (input section) 16 Communication unit 100 Inkjet recording device 141 Memory 141a Defective nozzle storage unit 143a Test image data 143b First complementary parameter B Blank area Lh Vertical line Lha Vertical line P Recording medium T Second test pattern Ta First test pattern

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Abstract

La présente invention permet de réduire la charge de traitement et le temps de traitement pour le traitement à des fins de détection de buses défectueuses. Elle concerne un appareil d'impression à jet d'encre (100) qui est pourvu : d'une section de mémorisation de buse défectueuse (141a) dans laquelle des données de spécification servant à spécifier une buse défectueuse dans une tête à jet d'encre (12) sont mémorisées ; et d'une unité de commande de formation d'image (14) pour commander la tête à jet d'encre de manière à former une image par décharge compensatoire pour la buse défectueuse par d'autres buses dans le voisinage de celle-ci. Lors de la formation d'un premier motif de test dans lequel des positions de formation de points sont établies pour chacune de multiples buses et qui sert à détecter des buses défectueuses autres que la buse spécifiée comme buse défectueuse dans les données de spécification, l'unité de commande de formation d'image commande la tête à jet d'encre de manière à compenser la buse qui a été spécifiée comme buse défectueuse dans les données de spécification.
PCT/JP2015/064176 2014-06-06 2015-05-18 Appareil de formation d'image et procédé de formation d'image WO2015186499A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019093713A (ja) * 2017-11-22 2019-06-20 ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフトＨｅｉｄｅｌｂｅｒｇｅｒ Ｄｒｕｃｋｍａｓｃｈｉｎｅｎ ＡＧ 可変の印刷ノズルテストパターン
WO2023054371A1 (fr) * 2021-09-28 2023-04-06 京セラドキュメントソリューションズ株式会社 Dispositif de formation d'image

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