JP2005153507A - Inkjet recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve image quality by suppressing ink bleeding and the enlargement of a dot diameter. <P>SOLUTION: This inkjet recording apparatus is equipped with a recording head for a colored ink, which ejects a photo-curing colored ink onto a recording medium, a recording head for a transparent ink, which ejects a photo-curing transparent ink onto the recording medium, and a photoirradiation device for applying light to the ink reaching the recording medium, so as to cure the ink. Since a control unit for controlling them controls the recording head for the colored ink, the recording head for the transparent ink, and the photoirradiation device, so that the colored ink and the transparent ink can be each individually cured, the mixing of the colored ink and the transparent ink can be prevented, and the ink bleeding and the enlargement of the dot diameter are suppressed, so that the image quality can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ink jet recording apparatus, and more particularly to an ink jet recording apparatus using photocurable ink.

2. Description of the Related Art Conventionally, an inkjet recording apparatus that records a predetermined image by ejecting ink onto a recording medium such as paper or a plastic thin plate has been proposed and put into practical use. In particular, in recent years, light such as ultraviolet rays is applied to ink landed on a recording medium using a photocurable ink so that an image can be recorded even on a non-absorbing recording medium. Ink jet recording apparatuses for forming images have been developed. As such an ink jet recording apparatus, for example, an apparatus that collectively irradiates a large amount of ultraviolet rays using a radical polymerization type ink has been developed (for example, see Patent Document 1). In order to make glossiness uniform, an ink jet recording apparatus that records an image using a transparent ink has also been proposed (see, for example, Patent Document 2).
JP 2001-310454 A JP 2003-191691 A

  Here, in the above ink jet recording apparatus, an image is recorded by mixing a plurality of inks having different colors on a recording medium and then curing by irradiating with ultraviolet rays. For example, cyan, magenta, yellow When a dot made of white ink or black ink is formed in the vicinity of a dot formed by mixing the three color inks, the color ink is mixed with the white ink or black ink, As a result, the image was supposed to be deteriorated.

  On the other hand, even in an ink jet recording apparatus using transparent ink, before all the ink is cured on the recording medium, the other ink is mixed with the transparent ink, and the image quality is deteriorated.

  An object of the present invention is to improve image quality by suppressing ink bleeding and dot diameter increase.

An ink jet recording apparatus according to the invention of claim 1
A recording head for colored ink that discharges photocurable coloring ink to a recording medium;
A recording head for transparent ink that discharges photocurable transparent ink onto a recording medium;
A light irradiation device for irradiating and curing the colored ink and the transparent ink landed on a recording medium;
A control device for controlling the recording head for colored ink and the recording head for transparent ink,
The controller is
After the colored ink is ejected from the colored ink recording head onto the recording medium and the colored ink on the recording medium is cured by the light irradiation device, the transparent ink is applied from the transparent ink recording head to the recording medium. Controlling the recording head for colored ink and the recording head for transparent ink so that the transparent ink on the recording medium is cured by the light irradiation device.
Alternatively, after the transparent ink is ejected from the transparent ink recording head onto the recording medium and the transparent ink on the recording medium is cured by the light irradiation device, the colored ink is recorded on the recording medium from the colored ink recording head. Controlling at least one of the recording head for colored ink and the recording head for transparent ink so that the colored ink on the recording medium is cured by ejecting ink and the light irradiation device. It is a feature.

The invention described in claim 2 is the ink jet recording apparatus according to claim 1,
A scanning device for scanning the recording head for colored ink and the recording head for transparent ink;
A conveyance device that conveys a recording medium in a direction orthogonal to a scanning direction by the scanning device,
The scanning device is characterized in that a plurality of the light irradiation devices are arranged on both sides of at least one of the recording head for colored ink and the recording head for transparent ink.

The invention described in claim 3 is the ink jet recording apparatus according to claim 2,
The scanning device is characterized in that a plurality of the light irradiation devices are arranged on both sides of at least the colored ink recording head and the transparent ink recording head.

The invention according to claim 4 is the ink jet recording apparatus according to claim 2 or 3,
The control device causes the light irradiation device to turn on only when one of the colored ink and the transparent ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. It is characterized by controlling the irradiation device.

A fifth aspect of the present invention is the ink jet recording apparatus according to the first aspect,
A transport device for transporting the recording medium;
The colored ink recording head and the transparent ink recording head are line head type recording heads arranged along a transport direction by the transport device,
A plurality of the light irradiation devices are provided so as to be disposed downstream of the colored ink recording head in the transport direction and downstream of the transparent ink recording head in the transport direction.

Invention of Claim 6 is an inkjet recording device as described in any one of Claims 1-5.
The amount of irradiation of the light irradiation device when the transparent ink is cured is smaller than the amount of irradiation of the light irradiation device when the colored ink is cured.

The ink jet recording apparatus according to the invention of claim 7 is:
A recording head for white ink that discharges photocurable white ink onto a recording medium;
A recording head for basic color ink that discharges a photocurable basic color ink having a color other than the white ink onto a recording medium;
A light irradiation device for irradiating and curing the white ink and the basic color ink landed on a recording medium;
A control device for controlling the recording head for white ink and the recording head for basic color ink,
The controller is
After the white ink is ejected from the white ink recording head onto the recording medium and the white ink on the recording medium is cured by the light irradiation device, the basic color is transferred from the basic color ink recording head to the recording medium. Controlling the white ink recording head and the basic color ink recording head so that the basic color ink on the recording medium is cured by the light irradiation device by ejecting ink;
Alternatively, after the basic color ink is ejected from the basic color ink recording head onto the recording medium and the basic color ink on the recording medium is cured by the light irradiation device, the white ink recording head transfers the recording medium. At least one of controlling the white ink recording head and the basic color ink recording head so that the white ink on the recording medium is cured by the light irradiation device. It is characterized by performing.

The invention according to claim 8 is the ink jet recording apparatus according to claim 7,
A scanning device for scanning the recording head for white ink and the recording head for basic color ink;
A conveyance device that conveys a recording medium in a direction orthogonal to a scanning direction by the scanning device,
The scanning device is characterized in that a plurality of the light irradiation devices are arranged on both sides of at least one of the white ink recording head and the basic color ink recording head.

The invention according to claim 9 is the ink jet recording apparatus according to claim 8,
The scanning device is characterized in that a plurality of the light irradiation devices are arranged on both sides of at least the white ink recording head and the basic color ink recording head.

The invention according to claim 10 is the ink jet recording apparatus according to claim 8 or 9, wherein
The control device is configured so that the light irradiation device is turned on only when one of the white ink and the basic color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. It is characterized by controlling the light irradiation device.

The invention described in claim 11 is the ink jet recording apparatus according to claim 7,
A transport device for transporting the recording medium;
The recording head for white ink and the recording head for basic color ink are line head type recording heads arranged along the transport direction by the transport device,
A plurality of the light irradiation devices are provided so as to be arranged downstream of the white ink recording head in the transport direction and downstream of the basic color ink recording head in the transport direction. .

The invention according to claim 12 is the ink jet recording apparatus according to any one of claims 1 to 11,
The colored ink or the basic color ink includes four colors of ink of cyan, magenta, yellow, and black.

An ink jet recording apparatus according to the invention of claim 13
A black ink recording head for discharging a photocurable black ink onto a recording medium;
A color ink recording head for discharging photocurable color ink onto a recording medium;
A light irradiation device for irradiating and curing the black ink and the color ink landed on a recording medium;
A control device for controlling the black ink recording head and the color ink recording head;
The controller is
After the black ink is ejected from the black ink recording head onto the recording medium and the black ink on the recording medium is cured by the light irradiation device, the color ink is applied from the color ink recording head to the recording medium. Controlling the black ink recording head and the color ink recording head so that the color ink on the recording medium is cured by the light irradiation device.
Alternatively, after the color ink is ejected from the color ink recording head onto the recording medium and the color ink on the recording medium is cured by the light irradiation device, the black ink is applied from the black ink recording head to the recording medium. Controlling at least one of the recording head for black ink and the recording head for color ink so that the black ink on the recording medium is cured by the light irradiation device by ejecting ink; It is a feature.

The invention according to claim 14 is the ink jet recording apparatus according to claim 13,
A scanning device for scanning the black ink recording head and the color ink recording head;
A conveyance device that conveys a recording medium in a direction orthogonal to a scanning direction by the scanning device,
The scanning device is characterized in that a plurality of the light irradiation devices are arranged on both sides of at least one of the black ink recording head and the color ink recording head.

The invention according to claim 15 is the ink jet recording apparatus according to claim 14,
The scanning device is characterized in that a plurality of the light irradiation devices are arranged on both sides of at least the black ink recording head and the color ink recording head.

The invention according to claim 16 is the ink jet recording apparatus according to claim 14 or 15, wherein
The control device causes the light irradiation device to turn on only when one of the black ink and the color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. It is characterized by controlling the irradiation device.

The invention according to claim 17 is the ink jet recording apparatus according to claim 13,
A transport device for transporting the recording medium;
The black ink recording head and the color ink recording head are line head type recording heads arranged in a transport direction by the transport device;
A plurality of the light irradiation devices are provided so as to be disposed downstream of the black ink recording head in the transport direction and downstream of the color ink recording head in the transport direction.

An ink jet recording apparatus according to the invention of claim 18
A first head group having a plurality of recording heads for chromatic ink that ejects photocurable chromatic ink onto a recording medium;
A second head group having at least one recording head for achromatic ink that discharges photocurable achromatic ink onto a recording medium;
A light irradiation device for irradiating and curing the chromatic color ink and the achromatic color ink landed on a recording medium;
A control device for controlling the chromatic recording head and the achromatic recording head;
The controller is
The chromatic color ink is ejected from the chromatic color ink recording head onto the recording medium, and after the chromatic color ink on the recording medium is cured by the light irradiation device, the achromatic color ink recording head is transferred to the recording medium. Controlling the chromatic color recording head and the achromatic color recording head so that the achromatic color ink is ejected and the light irradiation device cures the achromatic color ink on the recording medium;
Alternatively, after the achromatic ink is ejected from the achromatic ink recording head onto the recording medium and the achromatic ink on the recording medium is cured by the light irradiation device, the recording is performed from the chromatic ink recording head. Controlling the chromatic color ink recording head and the achromatic color ink recording head so that the chromatic color ink is ejected onto a medium and the chromatic color ink on the recording medium is cured by the light irradiation device; It is characterized by performing at least one of the following.

The invention according to claim 19 is the ink jet recording apparatus according to claim 18,
A scanning device for scanning the first head group and the second head group;
A conveyance device that conveys a recording medium in a direction orthogonal to a scanning direction by the scanning device,
The scanning device is characterized in that a plurality of the light irradiation devices are arranged on both sides of at least one of the first head group and the second head group.

The invention according to claim 20 is the ink jet recording apparatus according to claim 19,
The scanning device is characterized in that a plurality of the light irradiation devices are arranged at least on both sides of each of the first head group and the second head group.

The invention according to claim 21 is the ink jet recording apparatus according to claim 19 or 20,
The control device turns on the light irradiation device only when one of the chromatic color ink and the achromatic color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. The light irradiation device is controlled.

The invention according to claim 22 is the ink jet recording apparatus according to claim 18,
A transport device for transporting the recording medium;
The chromatic color recording head and the achromatic color recording head are line head type recording heads arranged along a conveying direction by the conveying device,
A plurality of the light irradiation devices are provided so as to be disposed downstream of the first head group in the transport direction and downstream of the second head group in the transport direction.

The invention according to claim 23 is the ink jet recording apparatus according to any one of claims 18 to 22,
The chromatic ink includes cyan, magenta, and yellow ink,
The achromatic ink includes at least one of black, white, and transparent ink.

A twenty-fourth aspect of the invention is the ink jet recording apparatus according to the twenty-third aspect,
The second head group includes a black ink recording head that discharges the black ink onto a recording medium, a white ink recording head that discharges the white ink onto a recording medium, and a transparent ink that discharges the transparent ink onto the recording medium. Consisting of at least two types of recording heads,
The light irradiation device is disposed between the at least two recording heads.

The invention according to claim 25 is the ink jet recording apparatus according to claim 24,
When the recording head for transparent ink is included in the second head group, the irradiation amount of the light irradiation device when the transparent ink is cured is the achromatic ink other than the transparent ink and It is characterized by being smaller than the irradiation amount of the light irradiation device when the chromatic ink is cured.

The invention according to claim 26 is the ink jet recording apparatus according to any one of claims 1 to 25,
The ink is an ultraviolet curable ink,
The light irradiation device is characterized in that at least part of the irradiation light contains ultraviolet rays.

  According to the first aspect of the present invention, since the curing of the colored ink and the curing of the transparent ink are performed separately, the mixing of the colored ink and the transparent ink can be prevented, and the ink bleeding and the dot diameter can be prevented. Can be suppressed, and the image quality can be improved.

  According to the second aspect of the invention, the same effects and advantages as those of the first aspect of the invention can be obtained even in the serial type ink jet recording apparatus.

  According to the invention described in claim 3, since the plurality of light irradiation devices are arranged on both sides of the recording head for the colored ink and the recording head for the transparent ink, the image recording using the colored ink and the image recording using the transparent ink are performed. Can be performed by one scan, and the recording speed can be improved.

  According to the fourth aspect of the invention, the light irradiation device is turned on only when one of the colored ink and the transparent ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. While the colored ink and the transparent ink are reliably cured, the light irradiation device can be prevented from being unnecessarily irradiated and the power consumption can be reduced.

  According to the fifth aspect of the present invention, the same effects and advantages as those of the first aspect of the invention can be obtained even in the line type ink jet recording apparatus.

  In addition, when the colored ink is irradiated with light, the light is inhibited by the colorant in the colored ink. However, since the transparent ink does not contain the colorant, the light is not inhibited. That is, if the ink amount is the same, the transparent ink is cured with a smaller irradiation amount than the colored ink. Therefore, as in the invention described in claim 6, even if the irradiation amount of the light irradiation device when curing the transparent ink is smaller than the irradiation amount of the light irradiation device when curing the colored ink, Inks and colored inks can be cured. Therefore, since light can be irradiated with an irradiation amount according to the ink type, it is possible to prevent the irradiation amount from becoming more than necessary and to reduce power consumption.

  According to the seventh aspect of the present invention, since the white ink and the basic color ink are individually cured, it is possible to prevent the white ink and the basic color ink from being mixed with each other. The increase in dot diameter can be suppressed and the image quality can be improved.

  According to the eighth aspect of the invention, the same effects and advantages as those of the seventh aspect of the invention can be obtained even in the serial type ink jet recording apparatus.

  According to the ninth aspect of the invention, since the plurality of light irradiation devices are arranged on both sides of the white ink recording head and the basic color ink recording head, the image recording with the white ink and the basic color ink are used. Image recording can be performed with a single scan, and the recording speed can be improved.

  According to the invention described in claim 10, since the light irradiation device is turned on only when one of the white ink and the basic color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction, While the above white ink and basic color ink are reliably cured, the light irradiation device can be prevented from being unnecessarily irradiated and the power consumption can be reduced.

  According to the invention of the eleventh aspect, even in the line type ink jet recording apparatus, the same operation and effect as those of the invention of the seventh aspect can be obtained.

  According to the twelfth aspect of the invention, even in an ink jet recording apparatus that uses four colors of ink of cyan, magenta, yellow, and black, the same operations and effects as the invention according to any one of the first to eleventh aspects are provided. Can be obtained.

  According to the invention of claim 13, since the black ink and the color ink are individually cured, it is possible to prevent the black ink and the color ink from being mixed, and the ink bleeding and the dot diameter can be prevented. Can be suppressed, and the image quality can be improved.

  According to the fourteenth aspect of the invention, the same effects and advantages as those of the thirteenth aspect of the invention can be obtained even in a serial type ink jet recording apparatus.

  According to the fifteenth aspect of the present invention, since the plurality of light irradiation devices are arranged on both sides of the black ink recording head and the color ink recording head, the black ink image recording and the color ink image recording are performed. Can be performed by one scan, and the recording speed can be improved.

  According to the sixteenth aspect of the invention, the light irradiation device is turned on only when one of the black ink and the color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. While the black ink and the color ink are reliably cured, the light irradiation device can be prevented from being unnecessarily irradiated and the power consumption can be reduced.

  According to the seventeenth aspect of the invention, the same effects and advantages as those of the thirteenth aspect of the invention can be obtained even in a line head type ink jet recording apparatus.

  According to the invention of claim 18, since the curing of the chromatic color ink and the curing of the achromatic color ink are individually performed, it is possible to prevent the chromatic color ink and the achromatic color ink from being mixed, It is possible to suppress blurring and increase in dot diameter and improve image quality.

  According to the nineteenth aspect of the invention, the same effects and advantages as those of the eighteenth aspect of the invention can be obtained even in a serial type ink jet recording apparatus.

  According to the invention of claim 20, since the plurality of light irradiation devices are arranged on both sides of the chromatic color ink recording head and the achromatic color ink recording head, image recording with chromatic color ink and achromatic color Image recording with ink can be performed with a single scan, and the recording speed can be improved.

  According to the twenty-first aspect of the invention, since the light irradiation device is turned on only when one of the chromatic color ink and the achromatic color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction, the recording is performed. While surely curing the chromatic color ink and the achromatic color ink on the medium, the light irradiation device can be prevented from being unnecessarily irradiated and the power consumption can be reduced.

  According to the twenty-second aspect of the present invention, the same effects and advantages as those of the first aspect of the invention can be obtained even in a line type ink jet recording apparatus.

  According to the twenty-third aspect of the present invention, there is also provided an inkjet recording apparatus that uses three colors of cyan, magenta, and yellow as chromatic ink and uses black, white, and transparent ink as achromatic ink. The effect | action and effect equivalent to the invention as described in any one of 18-22 can be acquired.

  According to the invention of claim 24, the second head group is composed of at least two of a black ink recording head, a white ink recording head, and a transparent ink recording head, and the light irradiation device is at least Since it is disposed between the two types of recording heads, it is possible to individually cure achromatic ink (black ink, white ink, transparent ink) discharged from at least two types of recording heads onto the recording medium.

  Here, if the ink amount is the same as described above, the transparent ink is cured with a smaller irradiation amount than the black ink, the white ink, and the chromatic color ink. From this, when the transparent head is included in the second head group as in the invention of claim 25, the irradiation amount of the light irradiation device when curing the transparent ink is The achromatic color ink and the chromatic color ink other than the transparent ink and the transparent ink can be cured even if the irradiation amount of the light irradiation device when curing the achromatic color ink and the chromatic color ink other than the transparent ink is smaller. Therefore, since light can be irradiated with an irradiation amount according to the ink type, it is possible to prevent the irradiation amount from becoming more than necessary and to reduce power consumption.

  According to the twenty-sixth aspect of the present invention, an action and effect equivalent to that of the first aspect of the present invention can be obtained even in an ultraviolet curable ink jet recording apparatus.

[First Embodiment]
A first embodiment will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.
First, the main configuration of the ink jet recording apparatus according to the present embodiment will be described with reference to FIG. FIG. 1 is a main configuration diagram of an ink jet recording apparatus.

  The ink jet recording apparatus 1 is a serial ink jet recording apparatus that records an image on a recording medium by ejecting ultraviolet curable ink while scanning a recording head on the recording medium. The ink jet recording apparatus 1 is provided with a platen 2 that supports the recording medium P from below, and a conveying device 3 (see FIG. 2) that conveys the recording medium P supported by the platen 2. Above the platen 2, a carriage 4 is provided as a scanning device that scans in a direction orthogonal to the conveyance direction of the recording medium P.

A plurality of recording heads 5 that discharge ink toward the recording medium P supported by the platen 2 are arranged in the carriage 4 along the scanning direction A. The plurality of recording heads 5 includes a transparent ink recording head 51 that discharges a transparent ink (Cl) that does not include a colorant, and a colored ink recording head 52 that discharges a color ink including a colorant. Here, since the colored ink includes a black ink (K) containing a black colorant, a color ink containing a colorant other than black, and the like, the black ink recording head 52a that discharges the black ink; The colored ink recording head 52 is constituted by the color ink recording head 52 b that discharges the color ink. In this embodiment, since three color inks of cyan (C), magenta (M), and yellow (Y) are used as color inks, three color ink recording heads 52b corresponding to the respective color inks. Is mounted on the carriage 4.
Further, the carriage 4 includes a plurality of light irradiation devices 6 that irradiate the recording medium P with light including ultraviolet rays. The transparent ink recording head 51, the black ink recording head 52a, and the color ink recording head 52b They are arranged on both sides in each scanning direction A.

FIG. 2 is a block diagram showing a main control portion of the ink jet recording apparatus 1. As shown in FIG. 2, the ink jet recording apparatus 1 is provided with a control device 10 for controlling each drive unit. The control device 10 includes an interface, a recording circuit, a CPU, and the like, and controls various devices connected to the interface according to a control program and control data written in the recording circuit.
To the interface, driving sources of the transport device 3, the carriage 4, and the recording head 5, and a light source of the light irradiation device 6 are electrically connected. In addition to these interfaces, each drive unit of the inkjet recording apparatus 1 is connected to this interface.
The CPU expands a program designated from among various programs stored in the recording circuit to a work area in the recording circuit, and executes various processes according to the program in accordance with input signals from each unit. It has become.

Next, the operation of the inkjet recording apparatus 1 of the present embodiment will be described.
The control device 10 controls the transport device 3 so that the recording medium P is transported intermittently at the image recording timing. When the recording medium P is stopped during the intermittent conveyance, the control device 10 controls the carriage 4 to scan the recording head 5 on the recording medium P. During scanning of the carriage 4, the control device 10 controls the recording head 5 so that ink is ejected from each recording head 5, and light is emitted from the light irradiation device 6 toward the recording medium P. The light irradiation device 6 is controlled to record an image on the recording medium P.

  Here, when the carriage 4 scans in the direction of the arrow A1 shown in FIG. 1, the light irradiation device 6a on the uppermost stream side in the scanning direction A1 cures the color ink landed on the recording medium P by the scanning, and 2 The light irradiation device 6b on the upstream side cures the black ink landed on the recording medium P in the scanning, and the light irradiation device 6c on the third upstream side clears the transparent ink landed on the recording medium P in the scanning. The ink will be cured. On the other hand, when the carriage 4 scans in the direction of the arrow A2 shown in FIG. 1, that is, the direction opposite to the direction of the arrow A1, the light irradiation device 6d on the most upstream side in the scanning direction A2 lands on the recording medium P by the scanning. The light irradiation device 6c that is the second upstream side cures the black ink that has landed on the recording medium P by the scanning, and the light irradiation device 6b that is the third upstream side is the scanning side. The color ink landed on the recording medium P is cured.

As described above, since the ink to be cured by each light irradiation device 6 varies depending on the scanning directions A1 and A2, the control device 10 irradiates the light irradiation device 6 that cures the transparent ink when the scanning directions A1 and A2 differ. Each light irradiation device 6 is controlled so that the amount is smaller than the irradiation amount of the light irradiation device 6 that cures colored ink such as black ink or color ink.
Note that the term “curing” as used herein means that only the surface portion of the ink droplet is not mixed with other ink droplets even if the entire ink droplet landed on the recording medium P is completely cured. It may be a cured initial curing.

  Accordingly, when the carriage 4 scans in the scanning direction A1, first, the transparent ink is ejected from the transparent ink recording head 51 onto the recording medium P, and the transparent ink on the recording medium P is ejected by the light irradiation device 6c. Cured. Thereafter, black ink is ejected from the black ink recording head 52a onto the recording medium P, and the black ink on the recording medium P is cured by the light irradiation device 6b. Finally, color ink is ejected from the recording heads 52b for each color ink onto the recording medium P, and the color ink on the recording medium P is cured by the light irradiation device 6a.

On the other hand, when the carriage 4 scans in the scanning direction A2, first, color ink is discharged onto the recording medium P from each color ink recording head 52b, and the color ink on the recording medium P is discharged by the light irradiation device 6b. Cured. Thereafter, black ink is ejected from the black ink recording head 52a onto the recording medium P, and the black ink on the recording medium P is cured by the light irradiation device 6c. Finally, the transparent ink is ejected from the transparent ink recording head 51 onto the recording medium P, and the transparent ink on the recording medium P is cured by the light irradiation device 6d.
By repeating these steps, an image is recorded on the recording medium P.

Here, the light irradiation devices 6d and 6a located on the most downstream side in the scanning directions A1 and A2 do not contribute to ink curing even if the light irradiation devices 6d and 6a are lit because they are not ejected on the downstream side. Therefore, when the carriage 4 scans in the scanning direction A1, the control device 10 causes the light irradiation device in which at least one of black ink, basic color ink, and transparent ink lands on the recording medium P on the downstream side in the scanning direction A1. The light irradiation device 6 is controlled so that only the light irradiation devices 6a, 6b, and 6c are turned on and the light irradiation device 6d located at the most downstream side is not turned on.
On the other hand, when the carriage 4 scans in the scanning direction A2, the control device 10 causes the light irradiation device in which at least one of black ink, basic color ink, and transparent ink lands on the recording medium P on the downstream side in the scanning direction A2. The light irradiation device 6 is controlled so that only the light irradiation devices 6b, 6c and 6d are turned on and the light irradiation device 6a located at the most downstream side is not turned on.
When an image is not recorded by all of the transparent ink recording head 51, the black ink recording head 52a, and the color ink recording head 52b during scanning, that is, when there is a recording head 5 that is unused during scanning. The light irradiation device 6 located immediately upstream of the unused recording head 5 may be turned off.

As described above, in the inkjet recording apparatus 1 of the present embodiment, the transparent ink, the black ink, and the color ink are individually cured, so that the transparent ink, the black ink, and the color ink are mixed. Can be prevented, ink bleeding and dot diameter increase can be suppressed, and image quality can be improved.
Further, since the plurality of light irradiation devices 6 are arranged on both sides of the transparent ink recording head 51, the black ink recording head 52a, and the color ink recording head 52b, the image recording with the transparent ink and the black ink are performed. Image recording and image recording with color ink can be performed by one scan, and the recording speed can be improved.
In addition, when the colored ink is irradiated with light, the light is inhibited by the colorant in the colored ink. However, since the transparent ink does not contain the colorant, the light is not inhibited. That is, if the ink amount is the same, the transparent ink is cured with a smaller irradiation amount than the colored ink. Therefore, as in the ink jet recording apparatus 1 of the present embodiment, the irradiation amount of the light irradiation device 6 when curing the transparent ink is made smaller than the irradiation amount of the light irradiation device 6 when curing the colored ink. However, the transparent ink and the colored ink can be cured. Therefore, since light can be irradiated with an irradiation amount according to the ink type, it is possible to prevent the irradiation amount from becoming more than necessary and reduce power consumption.
Furthermore, since the light irradiation devices 6a, 6b, 6c, and 6d are turned on and off so that at least each ink on the recording medium P is cured according to the scanning directions A1 and A2, the light irradiation is performed. It is possible to prevent the device 6 from being irradiated unnecessarily, and to reduce power consumption.

Of course, the present invention is not limited to the first embodiment but can be modified as appropriate.
For example, in the present embodiment, the inkjet recording apparatus 1 that performs bidirectional image recording with the carriage 4 is illustrated, but in the case of an inkjet recording apparatus that can perform higher-definition image recording and performs image recording in only one direction. For example, if the image recording is performed only in the scanning direction A1, the light irradiation device 6d located on the most downstream side in the scanning direction A1 can be omitted.
In addition, as long as the transparent ink, the black ink, and the color ink are individually cured, the arrangement order of the recording heads 5 and the light irradiation devices 6 may be arbitrary.

  In the present embodiment, the carriage 4 on which the transparent ink recording head 51 is mounted is illustrated. However, the carriage 4 is mounted with only the colored ink recording head 52 without mounting the transparent ink recording head 51. It does not matter. For example, as shown in FIG. 3, the color ink recording head 52 includes a carriage 4a on which a black ink recording head 52a, a color ink recording head 52b, and a white ink recording head 52c are mounted. Hereinafter, the carriage 4a will be described with reference to FIG. 3, but the same parts as those of the carriage 4 shown in FIG.

  A black ink recording head 52a, a color ink recording head 52b, and a white ink recording head 52c are arranged along the scanning direction A in the carriage 4a. The white ink recording head 52c discharges white ink (W) containing a white colorant toward the recording medium P.

When an image is recorded by the carriage 4a, if the carriage 4 scans in the scanning direction A1, first, white ink is ejected from the white ink recording head 52c onto the recording medium P, and light is emitted. The white ink on the recording medium P is cured by the irradiation device 6c. Thereafter, black ink is ejected from the black ink recording head 52a onto the recording medium P, and the black ink on the recording medium P is cured by the light irradiation device 6b. Finally, color ink is ejected from the recording heads 52b for each color ink onto the recording medium P, and the color ink on the recording medium P is cured by the light irradiation device 6a.
Here, when the carriage 4 scans in the scanning direction A1, the control device 10 performs light irradiation in which at least one of black ink, basic color ink, and white ink lands on the recording medium P on the downstream side in the scanning direction A1. The light irradiation device 6 is controlled so that only the devices 6a, 6b, and 6c are turned on and the light irradiation device 6d located at the most downstream side is not turned on.

On the other hand, when the carriage 4 scans in the scanning direction A2, first, color ink is ejected from the recording heads 52b for each color ink onto the recording medium P, and the color ink on the recording medium P is irradiated by the light irradiation device 6b. Is cured. Thereafter, black ink is ejected from the black ink recording head 52a onto the recording medium P, and the black ink on the recording medium P is cured by the light irradiation device 6c. Finally, white ink is ejected from the white ink recording head 52c onto the recording medium P, and the white ink on the recording medium P is cured by the light irradiation device 6d.
Here, when the carriage 4 scans in the scanning direction A2, the control device 10 performs light irradiation in which at least one of black ink, basic color ink, and white ink lands on the recording medium P on the downstream side in the scanning direction A2. The light irradiation device 6 is controlled so that only the devices 6b, 6c and 6d are turned on and the light irradiation device 6a located at the most downstream is not turned on.

  As described above, since the curing of the white ink and the curing of the basic color ink (black ink, color ink) having a color other than the white ink are individually performed, the white ink and the basic color ink are mixed. This can be prevented, ink bleeding and dot diameter increase can be suppressed, and the image quality can be improved. Further, since the curing of the black ink and the curing of the color ink are individually performed, the mixing of the black ink and the color ink can be prevented, and the image quality can be improved.

[Second Embodiment]
Next, an ink jet recording apparatus 1A according to a second embodiment will be described with reference to FIG. In the first embodiment described above, the serial type ink jet recording apparatus 1 has been described as an example, but in the second embodiment, a line type ink jet recording apparatus 1A will be described as an example. In the following description, components common to the inkjet recording apparatus 1 according to the first embodiment will be described with the same reference numerals.

  As shown in FIG. 4, a plurality of line head type recording heads 8 are arranged along the conveyance direction B by the conveyance device 3 above the platen 2 in the inkjet recording apparatus 1 </ b> A. The plurality of recording heads 8 include a transparent ink recording head 81 that discharges a transparent ink (Cl) that does not include a colorant, and a colored ink recording head 82 that discharges a color ink that includes a colorant. Here, since the colored ink includes a black ink (K) containing a black colorant, a color ink containing a colorant other than black, and the like, the black ink recording head 82a that discharges the black ink; The colored ink recording head 82 is constituted by the color ink recording head 82b for discharging the color ink. In this embodiment, since three color inks of cyan (C), magenta (M), and yellow (Y) are used as color inks, three color ink recording heads 82b corresponding to the respective color inks. Is provided.

  On the downstream side in the transport direction B of the transparent ink recording head 81, the black ink recording head 82a, and the color ink recording head 82b, the light irradiation device 6 is disposed, and the transparent ink landed on the recording medium P is disposed. The ink, black ink, and color ink are individually cured.

Next, the operation of the ink jet recording apparatus 1A of the present embodiment will be described.
The control device 10 controls the transport device 3 so that the recording medium P is transported continuously at the image recording timing. As the recording medium P is transported, the control device 10 controls the recording head 8 so that ink is ejected from each recording head 8, and the light irradiation device 6 emits light toward the recording medium P. Thus, the light irradiation device 6 is controlled to record an image on the recording medium P.

  Here, when the recording medium P is transported in the transport direction B, first, the transparent ink is ejected from the transparent ink recording head 81 onto the recording medium P, and is positioned immediately downstream of the transparent ink recording head 81. The transparent ink on the recording medium P is cured by the light irradiation device 6a. Thereafter, black ink is ejected from the black ink recording head 82a onto the recording medium P, and the black ink on the recording medium P is cured by the light irradiation device 6b located immediately downstream of the black ink recording head 82a. . Finally, the color ink is discharged onto the recording medium P from each color ink recording head 82b, and the color ink on the recording medium P is cured by the light irradiation device 6c located immediately downstream of the color ink recording head 82b. It is done.

  As described above, in the line-type inkjet recording apparatus 1A, the transparent ink, the black ink, and the color ink are individually cured, so that the transparent ink, the black ink, and the color ink are mixed. This can be prevented, ink bleeding and dot diameter increase can be suppressed, and the image quality can be improved.

Of course, the present invention is not limited to the second embodiment and can be modified as appropriate.
For example, in the second embodiment, the case where the light irradiation device 6 is controlled by the control device 10 is illustrated. However, even if the light irradiation device 6 is not controlled by the control device 10, line-type inkjet recording is performed. In the case of the apparatus 1, even if the light irradiation device 6 is turned on when the power is turned on, the black ink, the color ink, and the transparent ink can be individually cured.

  In the second embodiment, the line-type inkjet recording apparatus 1A including the transparent ink recording head 81 is illustrated. However, the colored ink recording head 82 is not mounted without mounting the transparent ink recording head 81. There may be a line type ink jet recording apparatus provided only with the above. For example, as shown in FIG. 5, as the colored ink recording head 82, an inkjet recording apparatus 1B including a black ink recording head 82a, a color ink recording head 82b, and a white ink recording head 82c can be cited. Hereinafter, the ink jet recording apparatus 1B will be described with reference to FIG. 5, but the same parts as those of the ink jet recording apparatus 1A described in FIG.

  In the ink jet recording apparatus 1B, a black ink recording head 82a, a color ink recording head 82b, and a white ink recording head 82c are arranged along the transport direction B. The white ink recording head 82c discharges white ink (W) containing a white colorant toward the recording medium P. When an image is recorded by the inkjet recording apparatus 1B, when the recording medium P is conveyed in the conveying direction B, first, white ink is ejected from the white ink recording head 82c onto the recording medium P. The white ink on the recording medium P is cured by the light irradiation device 6a located immediately downstream of the recording head 81 for white ink. Thereafter, black ink is ejected from the black ink recording head 82a onto the recording medium P, and the black ink on the recording medium P is cured by the light irradiation device 6b located immediately downstream of the black ink recording head 82a. . Finally, the color ink is discharged onto the recording medium P from each color ink recording head 82b, and the color ink on the recording medium P is cured by the light irradiation device 6c located immediately downstream of the color ink recording head 82b. It is done.

  As described above, the curing of the white ink, the curing of the black ink and the curing of the color ink are performed individually, so that the mixing of the white ink, the black ink and the color ink can be prevented, and the ink bleeding and the dot diameter can be prevented. Can be suppressed, and the image quality can be improved.

  Here, assuming that the three color inks of cyan, magenta, and yellow are chromatic color inks, and black ink, white ink, and transparent ink are achromatic inks, the color ink recording heads 52b and 82b are chromatic color ink recording heads. In other words, the black ink recording heads 52a and 82a, the white ink recording heads 52c and 82c, and the transparent ink recording heads 51 and 81 can be referred to as achromatic ink recording heads. Can be classified into a first head group composed of chromatic ink recording heads and a second head group composed of achromatic ink recording heads.

  In this case, for example, the control device 10 causes the chromatic color ink to be ejected from the chromatic color ink recording head onto the recording medium P, and the chromatic color ink on the recording medium P is cured by the light irradiation device 6. After that, the achromatic ink is ejected from the achromatic ink recording head onto the recording medium P, and the achromatic ink on the recording medium P is cured by the light irradiation device 6 so that the achromatic ink can be cured. After controlling the chromatic ink recording head or discharging the achromatic ink from the achromatic ink recording head to the recording medium P and curing the achromatic ink on the recording medium P by the light irradiation device 6, The chromatic color ink recording is performed so that the chromatic color ink is ejected from the chromatic color ink recording head onto the recording medium P, and the light irradiation device 6 cures the chromatic color ink on the recording medium P. Controlling the head and achromatic ink recording head, it is possible that at least either.

  At this time, in the case of the serial type ink jet recording apparatus 1, a plurality of light irradiation devices 6 are disposed on the carriage 4 at least on either side of either the first head group or the second head group. Furthermore, if a plurality of light irradiation devices 6 are disposed on the carriage 4 at least on both sides of each of the first head group and the second head group, image recording with chromatic ink and image recording with achromatic ink are possible. Is possible with a single scan, and the recording speed can be improved.

  Then, the control device 10 performs light irradiation so that the light irradiation device 6 is turned on only when one of the chromatic color ink and the achromatic color ink lands on the recording medium P on the downstream side of the light irradiation device 6 in the scanning direction. If the apparatus 6 is controlled, the chromatic color ink and the achromatic color ink on the recording medium P are reliably cured, but the light irradiation apparatus 6 is prevented from being unnecessarily irradiated and the power consumption is reduced. Can be preferred.

  On the other hand, in the case of the line type ink jet recording apparatuses 1A and 1B, the chromatic recording head and the achromatic recording head are line head type recording heads arranged along the transport direction by the transport device 3. The plurality of light irradiation devices 6 are provided so as to be arranged on the downstream side in the transport direction of the first head group and on the downstream side in the transport direction of the second head group.

In the inkjet recording apparatuses 1, 1 </ b> A, and 1 </ b> B, the second head group includes two types of black ink recording heads 52 a and 82 a and transparent ink recording heads 51 and 81, and black ink recording heads. The case of two types of recording heads 52a, 82a and white ink recording heads 52c, 82c is illustrated, but the combination is not limited to this, and the recording heads 51, 81 for transparent ink are not limited thereto. And white ink recording heads 52c and 82c, or black ink recording heads 52a and 82a, transparent ink recording heads 51 and 81, and white ink recording heads 52c and 82c. Cases.
In such a case, it is preferable that the light irradiation device 6 is disposed between at least two types of recording heads in order to reliably cure at least two types of achromatic inks individually.

When the second head group includes the recording heads 51 and 81 for transparent ink, the irradiation amount of the light irradiation device 6 when the transparent ink is cured is achromatic ink other than the transparent ink and It is smaller than the irradiation amount of the light irradiation device 6 when curing the chromatic color ink. Here, as described above, if the ink amount is the same amount, the transparent ink is cured with a smaller irradiation amount than the black ink, the white ink, and the chromatic color ink. If the irradiation amount of the device 6 is smaller than the irradiation amount of the light irradiation device 6 when curing the achromatic color ink and the chromatic color ink other than the transparent ink, light can be irradiated with the irradiation amount according to the ink type. Therefore, it is possible to reduce the power consumption by preventing the irradiation amount from becoming more than necessary.
Here, when the transparent ink and the other achromatic color ink and chromatic color ink are cured by one light irradiation device 6, the light irradiation device 6 is controlled by the control device 10 so that the irradiation amount is changed under the above conditions. In the case where one light irradiation device 6 and the ink to be cured are paired without changing at the time of image recording, the irradiation amount of the light irradiation device 6 is adjusted in advance so as to satisfy the above condition. It is also possible.

It is explanatory drawing showing the main structures of the inkjet recording device of 1st Embodiment. FIG. 2 is a block diagram illustrating a main control portion of the ink jet recording apparatus of FIG. 1. FIG. 8 is an explanatory diagram illustrating a modified example of a carriage provided in the ink jet recording apparatus of FIG. 1. It is explanatory drawing showing the main structures of the inkjet recording device of 2nd Embodiment. It is explanatory drawing showing the modification of the inkjet recording device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 3 Conveyance device 4 Carriage (scanning device)
6 Light irradiation device 10 Control device 51 Transparent ink recording head (achromatic ink recording head)
52 Colored ink recording head 52a Black ink recording head (achromatic ink recording head)
52b Color ink recording head (chromatic ink recording head)
A Scanning direction B Conveying direction P Recording medium

Claims (26)

A recording head for colored ink that discharges photocurable coloring ink to a recording medium;
A recording head for transparent ink that discharges photocurable transparent ink onto a recording medium;
A light irradiation device for irradiating and curing the colored ink and the transparent ink landed on a recording medium;
A control device for controlling the recording head for colored ink and the recording head for transparent ink,
The controller is
After the colored ink is ejected from the colored ink recording head onto the recording medium and the colored ink on the recording medium is cured by the light irradiation device, the transparent ink is applied from the transparent ink recording head to the recording medium. Controlling the recording head for colored ink and the recording head for transparent ink so that the transparent ink on the recording medium is cured by the light irradiation device.
Alternatively, after the transparent ink is ejected from the transparent ink recording head onto the recording medium and the transparent ink on the recording medium is cured by the light irradiation device, the colored ink is recorded on the recording medium from the colored ink recording head. Controlling at least one of the recording head for colored ink and the recording head for transparent ink so that the colored ink on the recording medium is cured by the light irradiation device by ejecting ink; An ink jet recording apparatus. The inkjet recording apparatus according to claim 1, wherein
A scanning device for scanning the recording head for colored ink and the recording head for transparent ink;
A conveyance device that conveys a recording medium in a direction orthogonal to a scanning direction by the scanning device,
The ink jet recording apparatus, wherein the scanning device includes a plurality of the light irradiation devices arranged on both sides of at least one of the colored ink recording head and the transparent ink recording head. The inkjet recording apparatus according to claim 2.
The ink jet recording apparatus, wherein the scanning device includes a plurality of the light irradiation devices disposed on both sides of at least the colored ink recording head and the transparent ink recording head. In the ink jet recording apparatus according to claim 2 or 3,
The control device causes the light irradiation device to turn on only when one of the colored ink and the transparent ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. An inkjet recording apparatus that controls an irradiation apparatus. The inkjet recording apparatus according to claim 1, wherein
A transport device for transporting the recording medium;
The colored ink recording head and the transparent ink recording head are line head type recording heads arranged along a transport direction by the transport device,
Inkjet characterized in that a plurality of the light irradiation devices are provided so as to be arranged downstream of the colored ink recording head in the transport direction and downstream of the transparent ink recording head in the transport direction. Recording device. In the ink jet recording apparatus according to any one of claims 1 to 5,
An ink jet recording apparatus, wherein an irradiation amount of the light irradiation device for curing the transparent ink is smaller than an irradiation amount of the light irradiation device for curing the colored ink. A recording head for white ink that discharges photocurable white ink onto a recording medium;
A recording head for basic color ink that discharges a photocurable basic color ink having a color other than the white ink onto a recording medium;
A light irradiation device for irradiating and curing the white ink and the basic color ink landed on a recording medium;
A control device for controlling the recording head for white ink and the recording head for basic color ink,
The controller is
After the white ink is ejected from the white ink recording head onto the recording medium and the white ink on the recording medium is cured by the light irradiation device, the basic color is transferred from the basic color ink recording head to the recording medium. Controlling the white ink recording head and the basic color ink recording head so that the basic color ink on the recording medium is cured by the light irradiation device by ejecting ink;
Alternatively, after the basic color ink is ejected from the basic color ink recording head onto the recording medium and the basic color ink on the recording medium is cured by the light irradiation device, the white ink recording head transfers the recording medium. At least one of controlling the white ink recording head and the basic color ink recording head so that the white ink on the recording medium is cured by the light irradiation device. An ink jet recording apparatus characterized in that The inkjet recording apparatus according to claim 7, wherein
A scanning device for scanning the recording head for white ink and the recording head for basic color ink;
A conveyance device that conveys a recording medium in a direction orthogonal to a scanning direction by the scanning device,
The ink jet recording apparatus, wherein the scanning device includes a plurality of the light irradiation devices disposed on both sides of at least one of the white ink recording head and the basic color ink recording head. The ink jet recording apparatus according to claim 8.
The ink jet recording apparatus, wherein the scanning device includes a plurality of the light irradiation devices arranged on both sides of at least the white ink recording head and the basic color ink recording head. The ink jet recording apparatus according to claim 8 or 9,
The control device is configured so that the light irradiation device is turned on only when one of the white ink and the basic color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. An ink jet recording apparatus that controls a light irradiation apparatus. The inkjet recording apparatus according to claim 7, wherein
A transport device for transporting the recording medium;
The recording head for white ink and the recording head for basic color ink are line head type recording heads arranged along the transport direction by the transport device,
A plurality of the light irradiation devices are provided so as to be arranged downstream of the white ink recording head in the transport direction and downstream of the basic color ink recording head in the transport direction. Inkjet recording device. In the ink jet recording apparatus according to any one of claims 1 to 11,
4. The ink jet recording apparatus according to claim 1, wherein the colored ink or the basic color ink includes inks of four colors of cyan, magenta, yellow, and black. A black ink recording head for discharging a photocurable black ink onto a recording medium;
A color ink recording head for discharging photocurable color ink onto a recording medium;
A light irradiation device for irradiating and curing the black ink and the color ink landed on a recording medium;
A control device for controlling the black ink recording head and the color ink recording head;
The control device includes:
After the black ink is ejected from the black ink recording head onto the recording medium and the black ink on the recording medium is cured by the light irradiation device, the color ink is applied from the color ink recording head to the recording medium. Controlling the black ink recording head and the color ink recording head so that the color ink on the recording medium is cured by the light irradiation device.
Alternatively, after the color ink is ejected from the color ink recording head onto the recording medium and the color ink on the recording medium is cured by the light irradiation device, the black ink is applied from the black ink recording head to the recording medium. Performing at least one of controlling the black ink recording head and the color ink recording head so that the black ink on the recording medium is cured by the light irradiation device by ejecting ink; An ink jet recording apparatus. The inkjet recording apparatus according to claim 13.
A scanning device for scanning the black ink recording head and the color ink recording head;
A conveyance device that conveys a recording medium in a direction orthogonal to a scanning direction by the scanning device,
The ink jet recording apparatus, wherein the scanning device includes a plurality of the light irradiation devices disposed on both sides of at least one of the black ink recording head and the color ink recording head. The inkjet recording apparatus according to claim 14, wherein
The ink jet recording apparatus, wherein the scanning device includes a plurality of the light irradiation devices arranged on both sides of at least the black ink recording head and the color ink recording head. The inkjet recording apparatus according to claim 14 or 15,
The control device causes the light irradiation device to turn on only when one of the black ink and the color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. An inkjet recording apparatus that controls an irradiation apparatus. The inkjet recording apparatus according to claim 13.
A transport device for transporting the recording medium;
The black ink recording head and the color ink recording head are line head type recording heads arranged in a transport direction by the transport device;
A plurality of the light irradiation devices are provided so as to be arranged downstream of the black ink recording head in the transport direction and downstream of the color ink recording head in the transport direction. Recording device. A first head group having a plurality of recording heads for chromatic ink that ejects photocurable chromatic ink onto a recording medium;
A second head group having at least one recording head for achromatic ink that discharges photocurable achromatic ink onto a recording medium;
A light irradiation device for irradiating and curing the chromatic color ink and the achromatic color ink landed on a recording medium;
A control device for controlling the chromatic recording head and the achromatic recording head;
The control device includes:
The chromatic color ink is ejected from the chromatic color ink recording head onto the recording medium, and after the chromatic color ink on the recording medium is cured by the light irradiation device, the achromatic color ink recording head is transferred to the recording medium. Controlling the chromatic color recording head and the achromatic color recording head so that the achromatic color ink is ejected and the light irradiation device cures the achromatic color ink on the recording medium;
Alternatively, after the achromatic ink is ejected from the achromatic ink recording head onto the recording medium and the achromatic ink on the recording medium is cured by the light irradiation device, the recording is performed from the chromatic ink recording head. Controlling the chromatic color ink recording head and the achromatic color ink recording head so that the chromatic color ink is ejected onto a medium and the chromatic color ink on the recording medium is cured by the light irradiation device; An ink jet recording apparatus that performs at least one of the following. The ink jet recording apparatus according to claim 18.
A scanning device for scanning the first head group and the second head group;
A conveyance device that conveys a recording medium in a direction orthogonal to a scanning direction by the scanning device,
The inkjet recording apparatus, wherein the scanning device includes a plurality of the light irradiation devices disposed on both sides of at least one of the first head group and the second head group. The ink jet recording apparatus according to claim 19, wherein
The inkjet recording apparatus, wherein the scanning device includes a plurality of the light irradiation devices arranged at least on both sides of each of the first head group and the second head group. The inkjet recording apparatus according to claim 19 or 20,
The control device turns on the light irradiation device only when one of the chromatic color ink and the achromatic color ink lands on the recording medium on the downstream side of the light irradiation device in the scanning direction. An inkjet recording apparatus that controls the light irradiation apparatus. The ink jet recording apparatus according to claim 18.
A transport device for transporting the recording medium;
The chromatic color recording head and the achromatic color recording head are line head type recording heads arranged along a conveying direction by the conveying device,
A plurality of the light irradiation devices are provided so as to be arranged on the downstream side in the transport direction of the first head group and on the downstream side in the transport direction of the second head group. . In the ink jet recording apparatus according to any one of claims 18 to 22,
The chromatic ink includes cyan, magenta, and yellow ink,
The achromatic ink includes at least one of black, white, and transparent ink. The inkjet recording apparatus according to claim 23,
The second head group includes a black ink recording head that discharges the black ink onto a recording medium, a white ink recording head that discharges the white ink onto a recording medium, and a transparent ink that discharges the transparent ink onto the recording medium. Consisting of at least two types of recording heads,
The inkjet recording apparatus, wherein the light irradiation device is disposed between the at least two types of recording heads. The inkjet recording apparatus according to claim 24,
When the recording head for transparent ink is included in the second head group, the irradiation amount of the light irradiation device when the transparent ink is cured is the achromatic ink other than the transparent ink and An ink jet recording apparatus characterized by being smaller than an irradiation amount of the light irradiation apparatus when curing chromatic ink. In the ink jet recording apparatus according to any one of claims 1 to 25,
The ink is an ultraviolet curable ink,
The ink jet recording apparatus, wherein the light irradiation device includes ultraviolet rays in at least a part of the irradiation light.

Images