JP2006076129A - Inkjet recorder - Google Patents

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Publication number
JP2006076129A
JP2006076129A JP2004262578A JP2004262578A JP2006076129A JP 2006076129 A JP2006076129 A JP 2006076129A JP 2004262578 A JP2004262578 A JP 2004262578A JP 2004262578 A JP2004262578 A JP 2004262578A JP 2006076129 A JP2006076129 A JP 2006076129A
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JP
Japan
Prior art keywords
print data
ink droplets
image
ink
recording apparatus
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Pending
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JP2004262578A
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Japanese (ja)
Inventor
Masatoshi Araki
雅俊 荒木
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Fuji Xerox Co Ltd
富士ゼロックス株式会社
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Priority to JP2004262578A priority Critical patent/JP2006076129A/en
Publication of JP2006076129A publication Critical patent/JP2006076129A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recorder which can nearly completely suppress curling of recording papers. <P>SOLUTION: In the inkjet recorder 10 equipped with first inkjet recording heads 24Y, 24M, 24C and 24K which form images by discharging colored ink droplets to the recording paper P, and a second inkjet recording head 24L which forms images by discharging colorless ink droplets to the recording paper P, printing data of the image to be formed by discharging the colorless ink droplets is calculated on the basis of printing data of the image to be formed by discharging colored ink droplets to a face at the opposite side to a face where the colorless ink droplets are discharged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an inkjet recording apparatus that records an image by ejecting ink droplets onto a recording sheet by an inkjet recording head.

  2. Description of the Related Art Conventionally, an ink jet recording apparatus that records an image on a recording medium such as recording paper by ejecting ink droplets from nozzles of an ink jet recording head is known. In such an ink jet recording apparatus, water-based ink is often used. For this reason, when the solvent component of the ink that has penetrated into the fibers of the recording paper by printing is dried, the recording paper may shrink and curl (curl).

  That is, in the case of single-sided recording, as shown in FIG. 19, before the ink is dried immediately after printing, the solvent component of the ink expands by permeating the fibers of the recording paper P, and the printing surface side is deformed so that it rises. After a while after printing, the solvent component of the ink evaporates, and the recording paper P contracts and curls more than before printing. Even in the case of double-sided recording, if the ink amounts on one side and the other side are greatly different, curling occurs due to the difference in shrinkage between the two. When such curling occurs, there is a problem that handling of printed recording paper becomes troublesome.

Therefore, conventionally, it has been proposed that the ratio of the total number of ink dots per unit area to the total number of pixels per unit area of the recording paper and the total number of dots of the printability improving liquid be within a predetermined range (for example, patents). Reference 1). According to this, curling of the recording paper can be suppressed within an allowable range, but since printing is performed only on one side, it cannot be expected until the curling is completely eliminated. Thus, there is still room for improvement in means for reliably preventing the recording paper from curling.
JP-A-8-216388

  In view of the above circumstances, an object of the present invention is to provide an ink jet recording apparatus that can substantially completely prevent a recording sheet from curling.

  In order to achieve the above object, an ink jet recording apparatus according to claim 1 of the present invention includes a first ink jet recording head that forms an image by ejecting colored ink droplets onto a recording paper, and the recording paper. A second ink jet recording head that discharges colorless ink droplets to form an image, and print data of an image formed by discharging the colorless ink droplets is discharged from the colorless ink droplets. It is calculated on the basis of print data of an image formed by ejecting the colored ink droplets on the surface opposite to the surface to be printed.

  According to the first aspect of the present invention, print data of an image formed by discharging colorless ink droplets is formed by discharging colored ink droplets on the surface opposite to the surface discharging colorless ink droplets. Therefore, the shrinkage rate on both sides of the recording paper after ink drying can be made substantially equal. Therefore, curling of the recording paper can be almost completely prevented.

  The ink jet recording apparatus according to claim 2 is the ink jet recording apparatus according to claim 1, wherein when the colored ink droplets are ejected only on one surface of the recording paper, an image is formed. Print data of an image formed by ejecting ink droplets is substantially the same as a mirror image of an image formed by ejecting colored ink droplets.

  According to the invention of claim 2, when an image is formed by discharging colored ink droplets only on one side of the recording paper, the print data of the image formed by discharging colorless ink droplets is colored ink droplets. Is substantially the same as the mirror image of the image formed by discharging the ink, so that the shrinkage rate on both sides of the recording paper after ink drying can be made substantially equal. Therefore, curling of the recording paper can be almost completely prevented.

  The ink jet recording apparatus according to claim 3 is the ink jet recording apparatus according to claim 1, wherein the colorless ink is used when an image is formed by ejecting the colored ink droplets on both surfaces of the recording paper. Print data of an image formed by ejecting droplets is calculated based on print data of both images formed by ejecting the colored ink droplets.

  According to the invention of claim 3, when forming an image by ejecting colored ink droplets on both sides of the recording paper, the print data of the image formed by ejecting colorless ink droplets ejects the colored ink droplets. Therefore, the shrinkage rate on both sides of the recording paper after ink drying can be made substantially equal even when duplex printing is performed. Therefore, curling of the recording paper can be almost completely prevented.

  According to a fourth aspect of the present invention, there is provided the inkjet recording apparatus according to the third aspect, wherein print data of an image formed by ejecting the colorless ink droplets ejects the colored ink droplets. The print data of both images formed in this way includes a portion that does not overlap.

  According to the invention of claim 4, the print data of the image formed by discharging colorless ink droplets includes a portion where the print data of both images formed by discharging colored ink droplets does not overlap. Consumption of the ink can be suppressed, and the shrinkage rate of both sides of the recording paper after ink drying can be made substantially equal. Therefore, curling of the recording paper can be almost completely prevented.

  An ink jet recording apparatus according to claim 5 is the ink jet recording apparatus according to claim 3 or 4, wherein the print data of the image formed by discharging the colorless ink droplets and the colored ink are used. The print data of the image formed by ejecting the droplets is characterized in that a predetermined dot interval is separated.

  According to the invention of claim 5, the print data of the image formed by discharging colorless ink droplets and the print data of the image formed by discharging colored ink droplets are separated by a predetermined dot interval. Therefore, bleeding of colored ink due to colorless ink is prevented. Therefore, a good image can be obtained.

  The inkjet recording apparatus according to claim 6 is the inkjet recording apparatus according to any one of claims 1 to 4, wherein print data of an image formed by ejecting the colorless ink droplets is recorded. The printing data of an image formed by discharging the colored ink droplets is included up to a portion enlarged by a predetermined dot.

  According to the sixth aspect of the present invention, the print data of the image formed by discharging colorless ink droplets includes the print data of the image formed by discharging colored ink droplets up to a portion enlarged by a predetermined dot. When both images are printed on the recording paper, a good image can be obtained even if the print data of both images are relatively subtly shifted.

  The ink jet recording apparatus according to claim 7 is the ink jet recording apparatus according to any one of claims 1 to 6, wherein the colorless ink is an image quality improving ink. Yes.

  According to the invention of claim 7, the quality of an image formed by discharging colored ink droplets can be improved. That is, it is possible to prevent bleeding of colored ink, and it is possible to realize both improvement of image quality and suppression of curling.

  The ink jet recording apparatus according to claim 8 is the ink jet recording apparatus according to claim 1, wherein the number of dots per unit area calculated from print data of an image formed by discharging the colored ink droplets. When the ratio is less than a predetermined threshold, the colorless ink droplet is not ejected.

  According to the invention of claim 8, consumption of colorless ink can be suppressed. In addition, when performing single-sided recording, it is possible to increase the printing speed.

  As described above, according to the present invention, it is possible to provide an ink jet recording apparatus that can substantially completely prevent the recording paper from curling.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below in detail based on the embodiments shown in the drawings. 1 and 2 show a schematic configuration of an ink jet recording apparatus according to the present invention. As shown in FIGS. 1 and 2, the ink jet recording apparatus 10 includes a paper feed tray 12 in which the recording paper P is accommodated, and a recording unit 14 that records an image on the recording paper P supplied from the paper feed tray 12. The first conveyance unit 16 that conveys the recording paper P to the recording unit 14, the paper discharge tray 18 that stores the recording paper P on which the image is recorded by the recording unit 14, and the recording in which the image is recorded on the paper discharge tray 18 A second transport unit 20 that transports the paper P, and a reversing unit 22 that is provided between the second transport unit 20 and the first transport unit 16 and that reverses the recording paper P and re-feeds it to the recording unit 14 during duplex printing. And have.

  The recording unit 14 has an inkjet recording head 24. The ink jet recording head 24 has a recordable area that is about the same as or larger than the maximum width of the recording paper P on which image recording by the ink jet recording apparatus 10 is assumed. That is, the ink jet recording head 24 is a so-called full width array (FWA) capable of single pass printing.

  The ink jet recording head 24 is arranged in the order of clear (L), yellow (Y), magenta (M), cyan (C), and black (K) from the upstream side with respect to the conveyance direction of the recording paper P. (See FIG. 4). The clear (L) inkjet recording head 24L is the second inkjet recording head that discharges “colorless” ink in the present invention, and is yellow (Y), magenta (M), cyan (C), and black (K). Each of the inkjet recording heads 24Y to 24K is a first inkjet recording head that discharges “colored” ink in the present invention.

  Each of the ink jet recording heads 24L to 24K is configured to eject ink droplets by a known means such as a thermal method or a piezoelectric method. In addition, in each of the inkjet recording heads 24L to 24K, nozzles (not shown) are arranged at an interval of 720 npi, and recording of 720 × 720 dpi is possible together with the conveyance of the recording paper P.

  Furthermore, the inkjet recording heads 24L to 24K are provided with maintenance units 26L to 26K. The maintenance units 26L to 26K are divided into two groups of black (K), cyan (C), magenta (M), yellow (Y), and clear (L). The heads 24L to 24K are configured to be movable to a maintenance position.

  Each of the maintenance units 26L to 26K includes a dummy jet receiver, a wiping member, a cap, and the like, and when the ink jet recording heads 24L to 24K are maintained, the ink jet recording heads 24L to 24K are raised by a predetermined height. It has become. Maintenance units 26L to 26K are arranged to face the nozzle surfaces (not shown) of the respective ink jet recording heads 24L to 24K.

  As shown in FIG. 3, the ink jet recording apparatus (printer) 10 is connected to a control device 28 such as a computer (PC) using an external interface. Therefore, when a print command is issued by an application on the control device 28, the print driver receives the print command, and transmits the print command and print data to the inkjet recording apparatus 10 through the external interface through an image conversion process.

  When an image signal such as a print command and print data is transmitted, the inkjet recording apparatus 10 determines a droplet ejection timing and a nozzle to be used by a print head controller, and applies a drive signal to the nozzle. Accordingly, the inkjet recording heads 24Y to 24K are configured to record images on the recording paper P. In addition, as shown in the drawing, the inkjet recording apparatus 10 is provided with a CPU and the like for controlling the entire operation.

  The recording paper P in the paper feed tray 12 is picked up one by one by the pickup roller 30 and is sent to the recording unit 14 by the first transport unit 16. The first transport unit 16 has a plurality of transport roller pairs 32 for transporting paper disposed at appropriate positions, and the recording paper P is re-supplied to the predetermined transport roller pair 32A from the reversing unit 22 described later. It has come to be.

  The recording unit 14 is wound around a driving roller 34 disposed on the upstream side in the sheet conveyance direction and a driven roller 36 disposed on the downstream side so that the printing surface of the recording sheet P faces the inkjet recording head 24. A conveyor belt 38 is provided, and the conveyor belt 38 is configured to circulate and drive (rotate) in the direction of arrow A (counterclockwise) in FIG. A nip roller 40 that is in sliding contact with the transport belt 38 from the front side is disposed on the drive roller 34.

  The second transport unit 20 includes a plurality of transport roller pairs 42 for transporting paper disposed at appropriate positions, and the predetermined transport roller pair 42A can send the recording paper P to the reversing unit 22 described later. It has become. The reversing unit 22 has a plurality of transport roller pairs 44 for transporting paper disposed at appropriate positions, and the recording sheet P is printed from the transport roller pair 42A to the transport roller pair 32A with the printed surface facing up. It is designed to be transported in a directed state.

  That is, as schematically shown in FIG. 4, the recording paper P that is supplied to the recording unit 14 and has an image formed on one surface (front surface) by passing under the ink jet recording heads 24Y to 24K is conveyed. When the rear end is pinched by the roller pair 42A, the conveying roller pair 42A rotates reversely and is sent to the reversing unit 22, and is sent to the conveying roller pair 32A by the conveying roller pair 44 shown in FIGS. Is done.

  Then, the sheet is sandwiched between the conveyance roller pair 32A and supplied again between the conveyance belt 38 and the nip roller 40. At this time, the non-printed surface is supplied so as to face the inkjet recording heads 24Y to 24K. The In this way, the recording paper P that has been turned upside down and on which the image is formed on the other side (back side) is discharged to the discharge tray 18 by the second transport unit 20 as it is.

  As shown in FIGS. 1 and 2, the ink jet recording apparatus 10 includes ink tanks 46L, 46Y, 46M, 46C, and 46K that supply ink to the ink jet recording heads 24L to 24K. Each of the ink tanks 46L to 46K is filled with an aqueous pigment ink as shown in FIG.

  Here, the conditions required for the clear ink (colorless ink) may be colored to the extent that it does not matter, but it should be colorless and transparent as much as possible, and the same level as that of other colored inks, or As described above, the recording paper P has a property of curling. Therefore, the clear ink in this embodiment is created by removing the color material from the other colored inks, but it may be simple water.

  In the ink jet recording apparatus 10 having the above configuration, a means for suppressing curling of the recording paper P will be described with reference to FIGS. As shown in FIG. 6, when a print command is issued by the application, the print driver determines whether the print data to be recorded is made on both sides of the recording paper P or only on one side (S1). . When it is determined that the recording is simplex printing, the dot arrangement of the colored ink is determined by image processing (S2).

  Here, for example, if the request from the application is to print the letter “B” on one side of the recording paper P with black ink, the dot arrangement as shown in FIG. 7A is determined. Then, based on the print data, the dot arrangement of the clear ink as shown in FIG. 7C is determined (S3).

  7B is an image obtained by horizontally inverting the dot arrangement in FIG. 7A, which corresponds to an image (mirror image) of the recording paper P viewed from the back side. That is, the same dot arrangement as the dot arrangement seen from the back side is set as the clear ink dot arrangement, and the black ink and clear ink dots are arranged at the same positions overlapping each other.

  The print data thus created is transferred to the ink jet recording apparatus 10 and stored in the storage memory of the ink jet recording apparatus 10, and then printing on the surface (printing of the print data shown in FIG. 7A) is performed with black ink. (S4). Thereafter, the recording paper P is reversed by the reversing unit 22 (S5), and printing of the back surface of the recording paper P (printing of the print data shown in FIG. 7C) is performed with clear ink (S6). This result is schematically shown in FIG.

  When clear ink is printed in this way, the shrinkage ratios of the front and back surfaces of the recording paper P can be made substantially equal, so the recording paper P does not curl before and after ink drying immediately after printing. That is, curling of the recording paper P can be almost completely prevented.

  Next, a case where the command from the application is double-sided recording will be described. When the command from the application is double-sided recording, as shown in FIG. 6, the dot arrangement of the colored ink is determined by image processing for each of the image to be recorded on the front surface and the image to be recorded on the back surface (S7). ), The positions formed on the paper surface are predicted based on the dot arrangement data on the front surface and the back surface, and the dot arrangement of the clear ink to be used on each surface is determined (S8).

  For example, if the request from the application is to print the letter “B” on the front side of the recording paper P with black ink and the letter “C” on the back side of the recording paper P with black ink, The dot arrangement is as shown in FIG. That is, FIG. 9A shows the dot arrangement on the front surface, and FIG. 9B shows the dot arrangement on the back surface. FIG. 9C shows the dot arrangement when viewed from the front side when the front and back surfaces overlap.

  Here, the print data to be printed on the front side requested by the application is as shown in FIG. 10A, but as shown in FIG. 10B, the print driver should be printed on the back side. A mirror image of the print data is predicted, and the print data shown in FIG. 10A and FIG. 10B are overlapped, and the clear ink is applied to the portion where there is a dot on the back surface and no dot on the front surface (the portion that does not overlap). Place a dot. Thereby, the print data of the surface to be actually printed as shown in FIG.

  Similarly, print data on the back side is created. That is, the print data to be printed on the back surface requested by the application is as shown in FIG. 11A, but as shown in FIG. 11B, the print driver prints the print data to be printed on the front surface. A mirror image of the data is predicted, and the print data shown in FIGS. 11A and 11B are overlapped, and the dots of the clear ink are formed on the portion where there is a dot on the front surface and no dot on the back surface (the non-overlapping portion). Place. As a result, print data of the back surface to be actually printed as shown in FIG. 11C is created.

  The front and back surface print data thus created is transferred to the ink jet recording apparatus 10 and stored in the storage memory of the ink jet recording apparatus 10, and then the front surface printing (printing of the print data shown in FIG. 10C) is performed in black. Ink and clear ink are used (S4). Thereafter, the recording paper P is reversed by the reversing unit 22 (S5), and printing of the back surface of the recording paper P (printing of the print data shown in FIG. 11C) is performed with black ink and clear ink (S6). ). This result is schematically shown in FIG.

  In this way, even when the print area is different between the front and back surfaces, the clear ink is printed so as to supplement the print area with each other, so that the shrinkage rate on both the front and back sides of the recording paper P can be made substantially equal. The recording paper P does not curl before and after ink drying. That is, curling of the recording paper P can be almost completely prevented.

  As shown in FIG. 13, the print data to be recorded on the back side created at the time of double-sided recording is a predetermined number of dots between the colored ink and the clear ink, for example, for the print data shown in FIG. The print data may be such that a gap of one dot is provided (with an interval). With such print data, bleeding of colored ink due to clear ink can be prevented, and a good image can be obtained.

  Further, as shown in FIG. 14, the clear ink print data created at the time of single-sided recording is increased (enlarged) by a predetermined dot, for example, one dot with respect to the print data shown in FIG. 7C. Such print data may be used. With such print data, a good image can be obtained even when the print positions on the front and back sides are relatively delicately shifted.

  Next, a first modification of the means for suppressing the curling of the recording paper P will be described with reference to FIGS. The first modification shown in FIG. 15 is different from the above-described embodiment in that a means for determining the ratio of the number of dots per unit area is provided after the dot arrangement of each color is determined by image processing. . That is, when the ratio of the number of dots per unit area is smaller than the threshold value at which the recording paper P does not curl (becomes an allowable range even when curled), clear ink may not be used. It has become.

  FIG. 16 shows an experimental result for obtaining an example of the threshold value. The threshold varies depending on the recording resolution, the amount of ink droplets (drop volume), and the like. Now, print data that fills almost the entire surface of the recording paper P is prepared, and the ratio of the number of dots per unit area is set with cyan ink having a recording resolution of 720 × 720 dpi and a droplet volume of 10 pl (picoliter). Printing was performed on the surface of the recording paper P while changing. Then, the deformation amount (curl height) in the height direction of the recording paper P after being completely dried was measured. The recording paper P was C2 paper manufactured by Fuji Xerox.

  From this experimental result, it can be seen that the threshold value is 25% under the above conditions. That is, under the above conditions, in the case of print data in which the ratio of the number of dots per unit area is less than 25%, the recording paper P is within an allowable range even when the recording paper P is curled (the deformation in the height direction is within 3 mm) (In this case, it is within 2 mm), so it is not necessary to print clear ink on the back surface. Thereby, at the time of single-sided recording, the printing speed can be increased, and consumption of clear ink can be suppressed for both single-sided and double-sided recording.

  Next, a second modification of the means for suppressing the curling of the recording paper P will be described with reference to FIG. In the above embodiment, the clear ink is a colorless and transparent ink containing no coloring material. However, in this second modification, the clear ink reacts with the colored ink to aggregate the pigment and prevent image blurring. Ink. As the image quality improving ink, for example, ink containing 20% glycerin, 5% diethylene glycol monobutyl ether, 1% magnesium nitrate, and 74% water (remainder) can be used.

  When such an image quality improving ink is used, the clear ink is printed (applied) before the colored ink where the colored ink is to be printed. For this reason, the image processing is different from that in the above embodiment. As a result, it is possible to prevent bleeding of colored ink that has landed later, and it is possible to realize both improvement in image quality and suppression of curling.

  In any case, the print data of the image formed by discharging the clear ink is the print data of the image formed by discharging the colored ink on the surface opposite to the surface on which the clear ink is discharged. If the configuration is calculated based on the above, the shrinkage ratios of the front and back surfaces of the recording paper P after ink drying can be made substantially equal, so that the curling of the recording paper P can be almost completely prevented. Therefore, it is possible to solve the problem that the handling of the recording paper P after printing becomes cumbersome.

  The clear ink print data (print area) calculated based on the print data of the recorded image is optimally created based on a mirror image as shown in the figure, but is not limited to this. Absent. For example, the ink amount of the color ink to be used is calculated from the print data of the image to be recorded, and the clear ink with a predetermined ratio (ratio that can make the shrinkage rate substantially equal) with respect to the ink amount is appropriately applied to the recording paper P. Even if it is made to print in an appropriate shape in an appropriate part (area), the effect can be sufficiently obtained.

  Incidentally, when the print data shown in FIG. 18A is used, curling of the recording paper P can be sufficiently suppressed without using a mirror image. That is, print data that fills almost the entire surface of the recording paper P is prepared, and printing is performed on the surface of the recording paper P with cyan ink having a recording resolution of 720 × 720 dpi and a droplet volume of 10 pl (picoliter). It was. Two of them are prepared. Clear ink is not printed on the back surface of one recording paper P1, and clear ink is printed on the back surface of the other recording paper P2 so as to have a predetermined width as shown in FIG. A check pattern (non-mirror image) was printed.

  The side views of the recording papers P1 and P2 after being completely dried are shown in FIGS. 18C and 18D, respectively. The recording paper P1 shown in FIG. 18C that is not printed with clear ink is curled so that both sides are lifted by about 40 mm, but printing is performed in a check pattern with clear ink in FIG. 18D. In the recording paper P2 indicated by (2), the deformation amount in the height direction could be suppressed to 3 mm or less. That is, curling of the recording paper P can be almost completely prevented.

  In addition, in the said Example, the inkjet recording head 24 is not limited to FWA, It is the same also in Partial Width Array (PWA) which reciprocates in the direction orthogonal to a paper conveyance direction. The ink jet recording apparatus 10 according to the present invention can be applied to all devices used for recording characters and images on the recording paper P, such as a facsimile, a copying machine, and a printer complex machine. The “image” in the present invention includes not only general images (characters, pictures, photographs, etc.) but also dot patterns obtained by landing ink droplets on the recording paper P.

Schematic side view showing the configuration of the ink jet recording apparatus during printing Schematic side view showing configuration during maintenance of inkjet recording apparatus Schematic block diagram showing a system of an ink jet recording apparatus Explanatory drawing schematically showing the configuration of the reversing mechanism Ink composition table Flowchart explaining means for creating clear ink print data Explanatory drawing showing print data of clear ink during single-sided printing Explanatory drawing showing the state of the recording paper before ink drying and after ink drying when clear ink is printed during single-sided printing Explanatory diagram showing clear ink print data during duplex printing Explanatory drawing showing print data on the front side during duplex printing Explanatory drawing showing the back side print data during duplex printing Explanatory drawing showing the state of the recording paper before ink drying and after ink drying when clear ink is printed during duplex printing Explanatory drawing showing print data of other clear ink during duplex printing Explanatory drawing showing print data of other clear ink during single-sided printing Flowchart explaining another means for creating clear ink print data Tables and graphs showing experimental results for determining thresholds Flowchart explaining another means for creating clear ink print data Explanatory drawing which shows the comparison result when not printing clear ink and printing Explanatory drawing showing the state of recording paper before and after ink drying during conventional single-sided printing

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inkjet recording device 14 Recording part 16 1st conveyance part 20 2nd conveyance part 22 Inversion part (inversion mechanism)
24Y inkjet recording head (first inkjet recording head)
24M inkjet recording head (first inkjet recording head)
24C inkjet recording head (first inkjet recording head)
24K inkjet recording head (first inkjet recording head)
24L inkjet recording head (second inkjet recording head)
26 Maintenance unit 38 Conveyor belt

Claims (8)

  1. A first inkjet recording head that discharges colored ink droplets onto a recording sheet to form an image;
    A second inkjet recording head for forming an image by discharging colorless ink droplets onto the recording paper;
    With
    The print data of the image formed by ejecting the colorless ink droplet is the print data of the image formed by ejecting the colored ink droplet on the surface opposite to the surface from which the colorless ink droplet is ejected. An ink jet recording apparatus that is calculated based on data.
  2.   When an image is formed by ejecting the colored ink droplets only on one side of the recording paper, the print data of the image formed by ejecting the colorless ink droplets ejects the colored ink droplets. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus is substantially the same as a mirror image of a formed image.
  3.   When an image is formed by ejecting the colored ink droplets on both sides of the recording paper, the print data of the image formed by ejecting the colorless ink droplet is formed by ejecting the colored ink droplets. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is calculated on the basis of print data of both images.
  4.   4. The print data of an image formed by discharging the colorless ink droplets includes a portion where print data of both images formed by discharging the colored ink droplets does not overlap. The ink jet recording apparatus described.
  5.   Print data of an image formed by discharging the colorless ink droplets and print data of an image formed by discharging the colored ink droplets are separated by a predetermined dot distance. The inkjet recording apparatus according to claim 3 or 4.
  6.   The print data of an image formed by discharging the colorless ink droplets includes up to a portion enlarged by a predetermined dot of the print data of the image formed by discharging the colored ink droplets. The inkjet recording apparatus according to any one of claims 1 to 4.
  7.   The inkjet recording apparatus according to any one of claims 1 to 6, wherein the colorless ink is an image quality improving ink.
  8.   When the ratio of the number of dots per unit area calculated from the print data of the image formed by ejecting the colored ink droplets is less than a predetermined threshold, the colorless ink droplet is not ejected. The inkjet recording apparatus according to claim 1, wherein
JP2004262578A 2004-09-09 2004-09-09 Inkjet recorder Pending JP2006076129A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
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JP2008018711A (en) * 2006-06-14 2008-01-31 Canon Inc Inkjet recording apparatus, data generation apparatus, and recorded matter
JP2008188877A (en) * 2007-02-05 2008-08-21 Seiko Epson Corp Liquid ejector, liquid ejection method, and program
JP2008200888A (en) * 2007-02-16 2008-09-04 Seiko Epson Corp Liquid delivering apparatus, liquid delivering method, and program
JP2008213267A (en) * 2007-03-02 2008-09-18 Seiko Epson Corp Liquid discharge apparatus, liquid discharge method and program thereof
US7942498B2 (en) 2007-01-19 2011-05-17 Seiko Epson Corporation Liquid discharging device
JP2011161822A (en) * 2010-02-10 2011-08-25 Fujifilm Corp Device and method for inkjet printing
JP2014162027A (en) * 2013-02-22 2014-09-08 Seiko Epson Corp Printer and control method for the same
JP2015058606A (en) * 2013-09-18 2015-03-30 富士フイルム株式会社 Image formation method
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