JP2019119051A - Recorded image reading control method and inkjet recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorded image reading control method and an inkjet recording apparatus capable of detecting an image defect more efficiently and promptly. SOLUTION: This is a recorded image reading control method for a recorded image with ink, and includes an image recording step of ejecting ink and landing on a recording medium, and an image reading step of reading an image with ink landing on the recording medium. In the image reading step, after the deviation rate of the dot diameter of the ink landed on the recording medium from the reference value is less than 5%, the deviation rate from the reference value of a predetermined value indicating the gloss of the ink landed on the recording medium is set. It is done while it is 10% or more. [Selection diagram] Fig. 1

Description

  The present invention relates to a print image reading control method and an inkjet printing apparatus.

  2. Description of the Related Art Conventionally, there is an inkjet recording apparatus which ejects ink from a nozzle to record an image or the like on a recording medium. In an inkjet recording apparatus, an ink which is solidified and fixed by a chemical reaction or the like by being irradiated with a specific electromagnetic wave such as ultraviolet light may be used.

  On the other hand, a predetermined image recorded and fixed on a recording medium is read to detect an image defect such as a discharge failure (discharge amount or discharge direction) from the nozzle, and the defective nozzle is cleaned or another nozzle is removed. There is a technique of correcting an image defect or the like by complementing the ink discharge from the ink jet printer (for example, Patent Document 1).

JP, 2014-216874, A

  However, the ink that has landed on the surface of the recording medium spreads on the surface of the recording medium, and it takes time until the ink penetrates the recording medium and becomes stable. As in the prior art, when the image by ink is stabilized on the recording medium and the image is read to evaluate the image quality, the detection of the image defect is delayed, and the time until the correction is performed, the time until the detection is There is a problem of wasting ink and recording media.

  An object of the present invention is to provide a recorded image reading control method and an inkjet recording apparatus capable of detecting an image defect more efficiently and rapidly.

In order to achieve the above object, the invention according to claim 1 is
It is a recording image reading control method concerning the recording image by ink,
An image recording step of discharging the ink to land on a recording medium;
An image reading step of reading an image by ink landed on a recording medium;
Including
In the image reading step, the deviation rate of the ink landed on the recording medium from the reference value of the dot diameter is less than 5%, and then the deviation rate from the reference value of the predetermined value indicating the gloss of the ink landed on the recording medium It is characterized in that it is carried out while is 10% or more.

The invention according to claim 2 is the recording image reading control method according to claim 1.
The ink is characterized in that the ink is fixed by an actinic ray of a predetermined wavelength.

In the third aspect of the present invention, in the recording image reading control method according to the second aspect,
Including a fixing step of irradiating the actinic radiation to the ink landed on the recording medium,
The fixing step is started after the image reading step.

The invention according to claim 4 relates to the method for controlling reading of a recorded image according to claim 3.
The reference value is a final value when fixed in the fixing step.

The invention according to claim 5 is the recording image reading control method according to any one of claims 1 to 4.
The ink is characterized in that the ink changes in phase between the sol state and the gel state according to the temperature.

The invention according to claim 6 is
A recording operation unit that ejects ink to land on a recording medium;
An image reading unit that reads an image from ink landed on the recording medium;
Equipped with
The image reading unit is a deviation ratio from a reference value of a predetermined value indicating the gloss of ink landed on the recording medium after the deviation ratio of the ink dot landed on the recording medium from the reference value is less than 5%. The ink jet recording apparatus is characterized in that the image is read while the light intensity is 10% or more.

  According to the present invention, the image defect can be detected more efficiently and quickly.

FIG. 1 is an overall perspective view showing an inkjet recording apparatus. FIG. 2 is a block diagram showing a functional configuration of the inkjet recording apparatus. FIG. 6 is a view schematically showing the state of change in gloss and the state of change in dot diameter with respect to the elapsed time after ink landing. It is a flowchart which shows the control procedure of an image recording control process.

Hereinafter, embodiments of the present invention will be described based on the drawings.
FIG. 1 is an overall perspective view showing an inkjet recording apparatus 1 according to an embodiment of the present invention.

  The inkjet recording apparatus 1 includes a conveyance unit 10, an image forming unit 20 (recording operation unit), an image reading unit 30, a fixing unit 40, a control unit 50, and the like.

  The conveyance unit 10 includes a conveyance drive unit 11, a conveyance belt 12, and the like. The conveyance drive unit 11 has a motor or the like, and is moved relative to the image forming unit 20 in a predetermined conveyance direction (relative movement direction) with the outer peripheral surface of the endless conveyance belt 12 as the conveyance surface. The recording medium M placed on top is moved in the transport direction. The conveyance speed of the recording medium M by the conveyance unit 10 may be, for example, discharging the ink onto a plurality of recording media M in a time required for the fixing operation of the image by the fixing unit 40 after the ink has landed on the recording medium M It can be as fast as possible.

  The image forming unit 20 performs a recording operation of forming an image by discharging ink from nozzles and landing the ink on the upper surface of the recording medium M (the side opposite to the side in contact with the outer peripheral surface of the transport belt 12). Here, the image forming unit 20 includes four head units 21Y, 21M, 21C, and 21K (hereinafter collectively referred to as the head unit 21), and yellow and magenta supplied from ink storage units (not shown), respectively. , And cyan and black inks are ejected. Each of these head units 21 is provided with nozzles over the recordable width of the recording medium M of a predetermined size (the above-mentioned maximum width size) in the width direction in a plane parallel to the transport surface, and ink can be ejected. There is. The number of head units 21 is not limited to four, and ink of ink colors other than YMCK may be ejected. The order in which the ink is ejected to the recording medium M is not limited to that illustrated.

  Here, the ink to be discharged is an ultraviolet curable ink which is fixed and solidified (hardened) by being irradiated with ultraviolet rays (active rays of a predetermined wavelength), and depending on the temperature, it is in the sol state or the gel state. There is a phase change between them.

  The image reading unit 30 is provided downstream of the image forming unit 20 in the conveyance direction of the recording medium M, and picks up and picks up an image formed on the recording surface of the recording medium M by the image forming unit 20. Output as data. The image reading unit 30 is, for example, a recording medium of a predetermined size (maximum width size capable of image recording by the ink jet recording apparatus 1) by the head unit 21 in the width direction intersecting (in this case, orthogonal to) the transport direction. It has a line sensor in which the imaging elements are arranged over the width enabling ink ejection on M. While the recording medium M is moved relative to the image reading unit 30 in the conveyance direction by the conveyance unit 10, one-dimensional image data within the imaging target range corresponding to the ink ejection range extended in the width direction is sequentially acquired by the line sensor By moving, a two-dimensional image on the recording medium M can be obtained.

  The fixing unit 40 irradiates the recording medium M on the conveyance surface with ultraviolet light to solidify and fix the ink that has landed on the recording medium M. The fixing unit 40 is provided downstream of the image reading unit 30 in the conveyance direction of the recording medium M. That is, the fixing operation (fixing process) is started after the image reading operation (image reading process) by the image reading unit 30 is completed. The fixing unit 40 may be provided with a cover member or the like so that the ultraviolet light to be irradiated does not largely leak from the irradiation range.

  The control unit 50 centrally controls the operation of each unit of the inkjet recording apparatus 1.

  FIG. 2 is a block diagram showing the functional configuration of the inkjet recording apparatus 1 of the present embodiment.

  The inkjet recording apparatus 1 includes, in addition to the image reading unit 30 and the fixing unit 40, a control unit 50, a conveyance driving unit 11, a head driving unit 22, a communication unit 60, a storage unit 70, and display / operation acceptance. And a bus 90 and the like.

  The control unit 50 performs a control operation of generally controlling the entire operation of the inkjet recording apparatus 1. In addition, the control unit 50 performs inspection and adjustment (correction) related to the overall image quality and the ink discharge from each of the nozzle openings based on the test image formed by the image forming unit 20 and read by the image reading unit 30. Perform such processing.

  The control unit 50 includes a CPU 51 (Central Processing Unit), a ROM 52 (Read Only Memory), a RAM 53 (Random Access Memory), and the like. The CPU 51 performs various arithmetic processing to execute processing relating to various controls. The ROM 52 stores and stores control programs related to various controls. As the ROM 52, one or both of a mask ROM and a readable and writable nonvolatile memory are used.

  The RAM 53 provides a working memory space to the CPU 51, and stores temporary data and various settings. As the RAM 53, various volatile memories such as SRAM and DRAM, or a combination thereof are used.

  The head drive unit 22 outputs a drive signal for operating the ink discharge mechanism in each head unit 21 and discharges the ink from the opening of the nozzle to be operated at an appropriate timing. These drive signals are output in parallel to each head unit 21. The drive signal is output in synchronization with an encoder (not shown) that measures the transport speed (position) of the recording medium M by the transport unit 10. As the ink discharge mechanism, for example, the piezoelectric element is deformed by applying a voltage to a piezoelectric element provided along the ink flow path communicating with the nozzle, and pressure is applied to the ink in the ink flow path with a predetermined pressure pattern. In addition, a piezoelectric type that discharges ink, or heat is generated by supplying a current to a heating wire, the ink in the ink flow path is heated, a part of it is vaporized, a volume change is generated, and pressure is applied to the ink to discharge Although the thermal type etc. to which it is made can be used, it is not particularly limited.

  The imaging drive unit 31 causes the image reading unit 30 to perform various operations related to reading of an image on the recording medium M. An operation of generating line image data from incident light amount data detected by operating the line sensor and outputting the data to the control unit 50 (RAM 53) or the storage unit 70 is performed. The imaging data may be directly output to the RAM 53 or the storage unit 70 by DMA (Direct Memory Access) without the control of the CPU 51. In addition, a predetermined calibration operation may be performed at the time of conversion from incident light amount data to imaging data.

  The communication unit 60 acquires recording target image data and a print job from an external computer terminal, a print server or the like, and outputs a status signal related to an image recording operation.

  The storage unit 70 stores the recording target image data acquired via the communication unit 60 and the processing data thereof. In addition, the storage unit 70 stores correction data 71 including information on the nozzle that is causing the ejection failure and information on the complement thereof. In addition, the storage unit 70 may store various execution programs related to the image recording operation, and the CPU 51 reads out and loads the execution program at the time of execution of the execution program. As the storage unit 70, for example, a hard disk drive (HDD) or a flash memory may be used, or a RAM may be used in combination.

  The display / operation reception unit 80 causes the display screen to display an input operation reception menu and status information of the user, and receives an input operation of the user and outputs an operation signal to the control unit 50. Here, the display / operation reception unit 80 includes, for example, a liquid crystal screen provided with a touch sensor and a driver thereof. Alternatively, for display, a display screen according to another display method such as an organic EL display may be used, or an LED lamp for status display may be used in combination. In addition, instead of or in addition to the touch panel, a push button switch, a rotary switch, a ten-key pad, or the like may be provided to receive the operation.

  The bus 90 is a signal path for transmitting and receiving signals between the control unit 50 and other components. An instruction to the image reading unit 30, read data from the image reading unit 30, a drive control signal to the fixing unit 40, and the like are exchanged with the control unit 50 via the bus 90.

  Next, the arrangement of the image reading unit 30 and the fixing unit 40 in the inkjet recording apparatus 1 will be described.

  In the inkjet recording apparatus 1 of the present embodiment, after causing the ink to land on the recording medium M, the image is read first and then the ink fixing operation is performed.

  FIG. 3 is a view schematically showing the state of change of gloss and the state of change of dot diameter with respect to the elapsed time after ink landing. The vertical axis shows values corresponding to relative changes, and has no meaning as an absolute value.

  After landing on the recording medium M, the ink penetrates the inside of the recording medium M or spreads on the upper surface, whereby the dot diameter is enlarged. The time required for this enlargement is about 100 msec here, and thereafter the rate of change (change per unit time) becomes almost zero, and the final dot diameter (ie, here after fixing) The difference with the dot diameter) becomes sufficiently small. When reading an image, the dot diameter affects the detection of luminance (density), so the difference in density (density ratio) according to the dot diameter at each timing with respect to the final dot diameter is used as the detection standard for defective nozzles. Needs to be less than the standard value of the concentration difference. The reference value is set so as to eliminate as much as possible the influence of noise and errors due to dirt on the reading surface (usually not more than several percent each) in addition to the resolution of the line sensor of the image reading unit 30. It does not have to be small. If the ratio of the dot diameter deviation to the final dot diameter (displacement ratio) is 5% or less, it is possible to detect density change based on an appropriate reference value that avoids misjudgment (misdetection or omission). .

  On the other hand, after landing on the recording medium M, the state of the gloss of the ink continues to change for a long time. Here, the rate of change (change per time) decreases at about 1000 msec, but changes gradually continue thereafter. This is mainly due to the gradual change in the state of unevenness of the ink as the temperature of the ink is changed (cooled) on the recording medium M. The final fixing of the recorded image is when the gloss state changes to a desired state and the timing is generally settled. Since the desired gloss state can be determined to some extent freely, the execution of the fixing operation is a stable state where the gloss does not finally change (the deviation of the value from the value indicating the final gloss is about zero) It does not have to be put on hold.

  As described above, the final fixing operation of the recorded image needs to be after the timing when the gloss state changes to the desired state and is generally settled, which takes time. On the other hand, in the case of detecting the ejection failure of the nozzles, it is only necessary to detect the density change corresponding to the ejection state of each nozzle, so that the stable determination from the read image becomes possible if the dot diameter is stable. Therefore, in the inkjet recording apparatus 1 according to the present embodiment, the dot diameter is stabilized (that is, the deviation ratio of the current dot diameter from the final dot diameter (reference value) determined by the fixing operation is about 5%) Less than 100 msec), the gloss state is almost stable within the desired level range (that is, the deviation of the predetermined value indicating gloss from the final value (reference value) by the fixing operation is about 10% Within 1000 msec), while the image is fixed, in particular, while the deviation rate of the predetermined value indicating gloss is 10% or more in consideration of the speed of feedback. The image is read in (period T1). Then, defective nozzle detection and complementing processing based on the read image is promptly performed.

  As long as the deviation rate of the predetermined value indicating gloss is 10% or more, it is a time (period T2) of about 1000 to 3000 msec after the landing of the ink. In addition to the speed of feedback described above, the longer the time to fixing, the longer the transport belt 12 needed, and the greater the space required. By limiting this to an appropriate value, in addition to the improvement of the feedback speed described above, the cost reduction of the transport belt 12 and the mechanism for causing it to circulate can be achieved, and the use space can be made more efficient.

  As described above, the reading range by the image reading unit and the irradiation range of the ultraviolet light by the fixing unit are arranged in such a positional relationship (distance) that the ultraviolet light irradiated by the fixing unit 40 does not affect the reading by the image reading unit 30. Be done.

  In the inkjet recording apparatus 1, the recording medium M may be conveyed at a plurality of conveyance speeds. Further, depending on the type of the ink and the type of the recording medium M, the characteristics of the change rate of the dot diameter (wettability) and the time change of the gloss state may change. On the other hand, if the inkjet recording apparatus 1 is configured to move the positions of the image reading unit 30 and the fixing unit 40 according to the situation, the apparatus becomes larger and control becomes complicated. In the inkjet recording apparatus 1 according to the present embodiment, the image reading and fixing operation is performed within the time range that satisfies the above-described conditions regardless of the combination of each conveyance speed, ink type, and recording medium type for normal image recording. The image reading unit 30 and the fixing unit 40 are fixedly arranged at the positions to be performed. Further, as in the inkjet recording apparatus 1 according to the present embodiment, when there is a deviation in the ink ejection and landing timing among a plurality of colors of ink, the conditions for the dot diameter of the ink that lands last and the landing first The reading range and the ultraviolet radiation range may be determined by combining the conditions for the ink gloss state.

  If there is a case where the position of the fixing unit 40 is largely separated from the image forming unit 20 and the size of the inkjet recording apparatus 1 increases more than necessary due to the combination of these, the transport speed according to the combination of the ink and the recording medium The upper limit of may be limited.

  The change in dot diameter and the change in gloss according to the type of ink and the type of recording medium can be inspected in advance. According to the inspection result of dot diameter and predetermined value indicating glossiness obtained as time series data of appropriate intervals, the ratio (displacement ratio) of the ink dot diameter from the final value becomes less than 5% The longest time and the shortest time until the deviation of the gloss value from the final value is less than 10% are obtained. According to these and the range of the transport speed that can be set, the readable range by the settable image reading unit 30 and the ultraviolet radiation range by the fixing unit 40 are determined. The arrangement of the image reading unit 30 and the fixing unit 40 with respect to the image forming unit 20 is set so that the reading range and the ultraviolet irradiation range are determined within the obtained settable range, and the ink jet recording apparatus 1 is manufactured.

  In the inkjet recording apparatus 1 according to the present embodiment, a density change detection chart for detecting a density change, for example, a halftone image or the like, is formed in the margin of the original recording target image during a normal image recording operation. Then, if a density change equal to or higher than the reference is detected in the width direction corresponding to the arrangement of each nozzle from the read data of the halftone image, is ink properly detected individually from the nozzles of the change portion? The defective nozzle identification chart for detecting whether or not it is output is output. That is, it is not necessary to be able to identify a defective nozzle directly from a halftone image, and by using such an image and image reading unit 30, cost and processing load at the time of defective image recording during normal image recording can be reduced. it can. The defective nozzle is identified by reading the output defective nozzle identification chart, and if it can be coped with by the complement from the nearby nozzles, after the complement setting is performed, the normal image recording operation is restored.

  FIG. 4 is a flowchart showing a control procedure by the control unit 50 of the image recording control process executed by the inkjet recording apparatus 1 of the present embodiment. This image recording control process is started, for example, by acquiring job data relating to image recording. The job to be obtained here is not particularly limited, but a request to continuously form the same image many times (a plurality of times) is made.

  When the image recording control process is started, the control unit 50 (CPU 51) starts an image recording operation (step S101; image recording step). The control unit 50 causes the ink of the image forming unit 20 to have an appropriate temperature, causes the recording medium to be conveyed, and causes the image forming unit 20 to eject the ink onto the conveyed recording medium M and lands on the recording medium M. And record the image. The control unit 50 causes the image reading unit 30 to read the recorded image and causes the fixing unit 40 to fix the image. The irradiation of the ultraviolet light by the fixing unit 40 may be continuously performed during the execution of the image recording control process, and the control unit 50 intermittently irradiates the ultraviolet light in accordance with the passage of the recording medium M. You may

  The control unit 50 causes the image reading unit 30 to read a density change detection chart from the recorded image (image by ink landed on the recording medium M), and acquires data of the read image (step S102; image reading process) . As described above, the image reading timing in step S102 is timing within a period in which the elapsed time after the ink lands on the recording medium M satisfies the condition. The control unit 50 analyzes the acquired read image data, and determines whether or not the density change above the reference is detected (step S103). If it is determined that the image has not been detected ("NO" in step S103), it is determined whether all the image recording related to the acquired job has ended (step S104). If it is determined that all the processes have been completed ("YES" in step S104), the control unit 50 ends the image recording control process. At this time, the operation of the transport unit 10 may be stopped. If it is determined that the process has not ended ("NO" in step S104), the process of the control unit returns to step S102.

  If it is determined in the determination process of step S103 that a density change equal to or higher than the reference is detected (“YES” in step S103), the control unit 50 causes the image forming unit 20 to output a defective nozzle identification chart (step S111). The control unit 50 causes the image reading unit 30 to read the defective nozzle identification chart and acquires read data (step S112). The control unit 50 analyzes the read data to specify a newly generated defective nozzle (step S113). The control unit 50 refers to the correction data 71 and determines whether or not the complementing process of the newly generated defective nozzle is possible in addition to the complementation setting up to now (step S114). If it is determined that it is not possible ("NO" in step S114), the control unit 50 causes the display / operation reception unit 80 to give a predetermined error notification and cancels the image recording operation (step S121). Then, the control unit 50 ends the image recording control process.

  If it is determined that the complementation processing is possible (“YES” in step S114), the control unit 50 performs the complementation processing to update the correction data 71 (step S115), and an image based on the correction data 71 The process returns to the recording operation (step S116). Then, the processing of the control unit 50 returns to step S102.

As described above, the recording image reading control method of the present embodiment is a recording image reading control method related to the recording image by the ink, and an image recording step of discharging the ink to land on the recording medium M, the recording medium M The image reading step includes reading an image (density change detection chart) by the ink that has landed, and the image reading step has a deviation rate from the reference value (final value) of the dot diameter of the ink landed on the recording medium M After becoming less than%, the predetermined value indicating the gloss of ink landed on the recording medium M is performed while the deviation ratio from the reference value (final value) is 10% or more.
As a result, it is possible to detect uneven density before fixing, while preventing erroneous detection or detection omission of uneven density according to the density change after landing of ink. That is, according to this recorded image reading control method, it is possible to efficiently and quickly detect an image defect related to a defective nozzle.
Therefore, it is possible to quickly feed back the detection result and output a high quality image while reducing the loss of the ink and the recording medium.

  The ink to be used is an ink fixed by actinic rays having a predetermined wavelength, here, ultraviolet light. In the case where such an ink is used, by setting the reading timing as described above, in particular, the change of the dot diameter rapidly converges during the change of the gloss before fixing, so that the detection result is more efficiently fed back. Becomes possible.

  In addition, the fixing process of irradiating the ink landed on the recording medium M with ultraviolet light is included, and the fixing process is started after the image reading process. Since it takes longer than the change in dot diameter to stabilize the change of gloss, the image reading operation is performed first, and then the fixing operation is performed after the gloss is stabilized, so that the image defect can be promptly performed. While being detected, an output image of appropriate image quality can be obtained.

  Further, each reference value related to the dot diameter and the gloss is a final value of the ink fixed in the fixing process. Thereby, an image defect can be detected promptly with detection accuracy sufficiently close to the final image.

  In addition, the ink is an ink which changes its phase between the sol state and the gel state according to the temperature. Thus, with the ink solidified and fixed in a raised form on the recording medium, it takes time for the change in gloss to be stabilized, so the present invention makes it possible to more rapidly detect image defects and maintain the image quality. It can be made to be compatible.

Further, the inkjet recording apparatus 1 of the present embodiment includes an image forming unit 20 that discharges ink to land on the recording medium M, and an image reading unit 30 that reads an image from the ink that has landed on the recording medium M. After the deviation rate from the reference value of the dot diameter of the ink landed on the recording medium M becomes less than 5%, the image reading unit 30 determines from the reference value of the predetermined value indicating the gloss of the ink landed on the recording medium M The image is arranged to be read while the displacement rate is 10% or more.
Such an inkjet recording apparatus 1 can detect an image defect due to a defective nozzle efficiently and promptly and accurately. As a result, the information on the defective nozzle is promptly fed back to correct the recording operation, and the loss of time relating to the recording medium, the ink and the image recording operation can be reduced, and the productivity can be improved.

The present invention is not limited to the above embodiment, and various modifications are possible.
For example, in the above-described embodiment, the ink which is solidified and fixed by irradiating the ultraviolet light is described as an example, but the ink may be an ink which is fixed by reacting to electromagnetic waves of wavelengths other than the ultraviolet light. In that case, a fixing unit for emitting an electromagnetic wave of the corresponding wavelength is provided. Further, even in the case of aqueous ink or the like fixed by a heater, natural drying or the like, the reading timing can be similarly set based on the dot diameter, gloss and the like serving as a reference.

  In addition, in the case of ink fixed on a predetermined time scale in a relatively long time (here, 1 to 3 seconds or more) according to external light and the like without actively irradiating the fixing unit, the fixing unit is used. The reading timing by the image reading unit 30 may be determined according to the predetermined time scale without being provided. In addition, in the case where the fixing operation is slow and is performed for a long time (for example, one second or more), the fixing operation may be started earlier than the reading operation, and the reading operation is performed in the middle of the fixing operation. It is also good.

  In the above embodiment, the reading timing is determined based on the deviation ratio of each value with respect to the final value of dot diameter and gloss after fixing. However, the dot diameter is almost stable, and the dot diameter is approximately fixed. If it is relatively possible to detect the density deviation according to the relative change in the density change detection chart, or if the desired absolute value (for example, the fixing operation is not performed, for example, by multiplying the predetermined coefficient as needed) If it is possible to obtain the required dot diameter and gloss predetermined value that will finally be obtained with the required accuracy, it is not necessary to determine the reading timing based on the deviation from the final dot diameter and gloss. Good. In this case, the reading timing is based on the reference value of the reference timing related to the dot diameter capable of appropriately acquiring relative density unevenness or the change amount per unit time, that is, the reading timing based on the deviation ratio using the value before unit time May be defined.

  Further, in the above embodiment, although the phase change ink which changes between the sol state and the gel state is used, the present invention is not limited to this.

  Further, in the above embodiment, the image reading unit 30 and the fixing unit 40 are fixedly arranged so as to satisfy the condition of any of the combination of the assumed ink type, the recording medium type and / or the conveyance speed. However, the present invention does not exclude a configuration in which the image reading unit 30 and / or the fixing unit 40 can be moved according to these conditions. In addition, when the ink is improved or a new ink is introduced, adjustment may be possible based on the update data. In this case, the storage unit 70, the ROM 52, etc. hold in advance information related to the set position according to the conditions, and the control unit 50 reads this information and moves the image reading unit 30 and / or the fixing unit 40. It is also good. For the movement, a rail, an arm, a belt, etc. which are conventionally known can be used in combination with a motor.

In addition, an image reading unit for reading an image in applications other than detection of defective nozzles may be separately provided downstream of the fixing unit 40 in the transport direction.
In addition, specific details such as the configuration, arrangement, setting, control content, and control procedure described in the above embodiment can be appropriately changed without departing from the spirit of the present invention.

Reference Signs List 1 inkjet recording apparatus 10 conveyance unit 11 conveyance drive unit 12 conveyance belt 20 image forming units 21, 21 Y, 21 M, 21 C, 21 K head unit 22 head drive unit 30 image reading unit 31 imaging drive unit 40 fixing unit 50 control unit 51 CPU
52 ROM
53 RAM
60 communication unit 70 storage unit 71 correction data 80 display / operation reception unit 90 bus M recording medium

Claims (6)

It is a recording image reading control method concerning the recording image by ink,
An image recording step of discharging the ink to land on a recording medium;
An image reading step of reading an image by ink landed on a recording medium;
Including
In the image reading step, the deviation rate of the ink landed on the recording medium from the reference value of the dot diameter is less than 5%, and then the deviation rate from the reference value of the predetermined value indicating the gloss of the ink landed on the recording medium The recording image reading control method according to claim 1, wherein the recording image reading control method is performed while 10% or more.   The method according to claim 1, wherein the ink is an ink fixed by an actinic ray of a predetermined wavelength. Including a fixing step of irradiating the actinic radiation to the ink landed on the recording medium,
The method according to claim 2, wherein the fixing step is started after the image reading step.   4. The method according to claim 3, wherein the reference value is a final value when fixed in the fixing step.   The method according to any one of claims 1 to 4, wherein the ink is an ink which changes its phase between a sol state and a gel state according to a temperature. A recording operation unit that ejects ink to land on a recording medium;
An image reading unit that reads an image from ink landed on the recording medium;
Equipped with
The image reading unit is a deviation ratio from a reference value of a predetermined value indicating the gloss of ink landed on the recording medium after the deviation ratio of the ink dot landed on the recording medium from the reference value is less than 5%. An image recording apparatus that reads the image while the image is 10% or more;

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