JP5630535B2 - Printing apparatus and printing method - Google Patents

Description

  The present invention relates to a printing apparatus and a printing method for printing an image on a medium by ejecting ink droplets from nozzles of a head.

An ink jet printer is known as a printing apparatus. This printer prints an image on a medium by ejecting ink droplets from a nozzle of a head toward the medium.
As this medium, a transparent medium such as a transparent film, that is, a medium in which the opposite side can be seen through the medium may be used. In Patent Document 1, a white background image is printed on the transparent medium, and the target image is printed on top of the white background image, and the target image is printed on the transparent medium. In addition, a printer that can be switched between a “backing printing mode” in which a white background image is superimposed and printed thereon is shown. In addition, an image printed on a transparent medium by the printer of Patent Document 1 is printed as a reflected image in which an image is viewed from one side by reflected light.

JP 2003-285422 A

By the way, when forming the first image and the second image on both sides of the background image, respectively, the first image and the second image are printed so as to be seen as reflection images from each side, or the second image is printed on the second image. If you can print as a transparent image as a transparent image from one image side, you can produce two different kinds of printed matter, that is, the printer can increase the types of printed matter that can be printed. Can improve convenience.
The present invention has been made in view of the above problems, and an object of the present invention relates to printing an image on a medium such as a transparent medium that can be seen through the opposite side. The image printed on the medium is a reflected image. And forming as a transparent image are easily switched and executed.

The main invention for achieving the above object is:
A device having a head for ejecting ink droplets from a nozzle and printing an image on a medium based on a selected mode;
The medium is a transparent medium;
When the first mode is selected, the head forms a first dot that forms a first image on the medium, and forms a first background image on at least a part of the first dot. Forming a background dot, forming a second dot forming a second image on the first dot and the first background dot on the first dot;
When the second mode is selected, the head forms a first dot that forms a first image on the medium, and a second background image forms a second background image on at least a part of the first dot. Forming a background dot, forming a second dot forming a second image on the first dot and the second background dot on the first dot;
By reducing the contact area between the first dot and the second background dot to be smaller than the contact area between the first dot and the first background dot, the transmission density in the second mode is transmitted in the first mode. It is a printing device that makes it higher than the density .
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

1 is a block diagram illustrating a configuration of a printing system 100. FIG. FIG. 2A is a schematic diagram of the overall configuration of the printer 1, and FIG. 2B is an overall configuration diagram of the printer 1. 4 is an explanatory diagram of nozzle arrangement in a head 41 of a head unit 40. FIG. It is a figure explaining the structure of a head. It is a figure explaining the drive signal COM. 6 is a flowchart for explaining a printing process in the first embodiment. It is a figure for demonstrating a real image. It is a figure for demonstrating the mirror image with respect to a real image. It is a figure explaining the overlapping order of ink. FIG. 10A is a diagram for explaining the overlap of ink in the first image to the second image in the reflection mode, and FIG. 10B is a diagram for explaining the overlap of ink in the first image to the second image in the transmission mode. FIG. 10C is a diagram for explaining the overlap of ink in the first image and the second image in the transmission mode when white dots are thinned out. It is explanatory drawing of the band printing in 1st Embodiment. It is explanatory drawing of the interlaced printing in 1st Embodiment. It is explanatory drawing of the micro feed printing in 1st Embodiment. It is explanatory drawing of the band printing in 2nd Embodiment. It is explanatory drawing of the overlap of the ink of the interlaced printing in 2nd Embodiment. It is explanatory drawing of the interlaced printing in 2nd Embodiment. It is explanatory drawing of the overlap of the ink of interlaced printing when the resolution of a 2nd image is low. It is explanatory drawing of the interlace printing when the resolution of a 2nd image is low. It is explanatory drawing of the micro feed printing in 2nd Embodiment. It is explanatory drawing of micro feed printing when the resolution of a 2nd image is low. It is explanatory drawing of the band printing in 3rd Embodiment. It is explanatory drawing of the interlaced printing in 3rd Embodiment. It is explanatory drawing of the micro feed printing in 3rd Embodiment. 1 is a block diagram illustrating a configuration of a printing system 100 including a line printer 1 ′. It is a perspective view of line printer 1 '. It is explanatory drawing of the nozzle row unit 41 in the line printer 1 '. It is a figure explaining printing in line printer 1 '.

  At least the following matters will become clear from the description of the present specification and the accompanying drawings.

An apparatus having a head for ejecting ink droplets from a nozzle and printing an image on a medium based on a selected mode;
The medium is a transparent medium;
When the first mode is selected, the head prints a first image on the medium, prints a first background image on the first image, and on the first background image, Printing a second image different from the first image;
When the second mode is selected, the head prints the first image on the medium, and a second background having a transmission density higher than that of the first background image on the first image. A printing apparatus that prints an image and prints the second image on the second background image.
By doing so, it is possible to easily switch and execute the formation of the image printed on the medium as a reflection image and the formation of a transmission image.

  In this printing apparatus, the head has a nozzle that ejects ink droplets of the background color to print the background image with a predetermined background color, and the background color ink is irradiated with ultraviolet rays. The amount of irradiation of the ultraviolet light applied to the ink droplet landed on the first image so as to form the background image is different between the first mode and the second mode. Accordingly, it is preferable that the first background image and the second background image have different degrees of transparency. Alternatively, the transmission densities of the first background image and the second background image may be made different by making the amounts of printing ink per predetermined area of the medium of the first background image and the second background image different from each other. Good. In the first mode, a mirror image of the first image is printed, and a real image of the second image is printed. In the second mode, both the first image and the second image are real images and mirror images. It is desirable to print either one. In the first mode, it is preferable that the print resolution of the first image and the print resolution of the second image are different.

And a transport unit configured to transport the medium in the transport direction, wherein the head is guided to move along a moving direction intersecting the transport direction, and the head is guided along the transport direction. A plurality of nozzles are provided, and a dot is formed on the medium by transporting the medium in the transport direction by the transport unit and ejecting ink droplets from the nozzle while moving the head in the movement direction. It is desirable that the image is printed by repeating the dot forming operation, and the print resolution is the print resolution in the transport direction. Further, it is desirable to have a moving mechanism that moves the relative position of the medium and the head in a direction that intersects the nozzle row direction in which the nozzles are arranged.
By doing so, it is possible to easily switch and execute the formation of the image printed on the medium as a reflection image and the formation of a transmission image.

A method of printing an image on a medium based on a selected mode, having a head that ejects ink droplets from a nozzle,
The medium is a transparent medium;
When the first mode is selected, the head prints a first image on the medium, prints a first background image on the first image, and on the first background image, Printing a second image different from the first image;
When the second mode is selected, the head prints the first image on the medium, and a second background having a transmission density higher than that of the first background image on the first image. A printing method of printing an image and printing the second image on the second background image.
By doing so, it is possible to easily switch and execute the formation of the image printed on the medium as a reflection image and the formation of a transmission image.

=== First Embodiment ===
<About the printing system>
FIG. 1 is a block diagram illustrating a configuration of the printing system 100. A printing system 100 according to this embodiment is a system including a printer 1 and a computer 110 as shown in FIG.

  The printer 1 is a printing apparatus that ejects ink onto a medium to form (print) an image on the medium. In the present embodiment, the printer 1 is a serial color ink jet printer. The printer 1 can print images on a plurality of types of media such as a film sheet S. The configuration of the printer 1 will be described later.

  The computer 110 includes an interface 111, a CPU 112, and a memory 113. The interface 111 exchanges data with the printer 1. The CPU 112 performs overall control of the computer 110 and executes various programs installed in the computer 110. The memory 113 stores various programs and various data. Among the programs installed in the computer 110, there is a printer driver for converting image data output from the application program into print data. Then, the computer 110 outputs the print data generated by the printer driver to the printer 1.

<Printer configuration>
FIG. 2A is a schematic diagram of the overall configuration of the printer 1. FIG. 2B is a cross-sectional view of the overall configuration of the printer 1.
The printer 1 includes a transport unit 20, a carriage unit 30, a head unit 40, a detector group 50, a controller 60, a drive signal generation circuit 70, and an ultraviolet irradiation unit 90.

  In the printer 1, each unit (conveyance unit 20, carriage unit 30, head unit 40, drive signal generation circuit 70, ultraviolet irradiation unit 90) is controlled by the controller 60. The controller 60 controls each unit based on the print data received from the computer 110 and prints an image on a medium such as the film sheet S. Here, the film sheet used in the present embodiment is a sheet that can be seen through the opposite side through the film. Note that the transparent medium in the present embodiment may be a semi-transparent medium or the like, or any medium that can be seen through.

  The transport unit 20 is for transporting the film sheet S in a predetermined direction (hereinafter referred to as a transport direction). The transport unit 20 includes a paper feed roller 21, a transport motor 22, a transport roller 23, a platen 24, and a paper discharge roller 25. The paper feed roller 21 is a roller for feeding the film sheet S inserted into the medium insertion opening into the printer. The transport roller 23 is a roller that transports the film sheet S fed by the paper feed roller 21 to a printable region, and is driven by the transport motor 22. The platen 24 supports the film sheet S during printing. The paper discharge roller 25 is a roller for discharging the film sheet S to the outside of the printer, and is provided on the downstream side in the transport direction with respect to the printable area. The paper discharge roller 25 rotates in synchronization with the transport roller 23.

  The carriage unit 30 is for moving the head in a predetermined direction (moving direction in the figure). The carriage unit 30 includes a carriage 31 and a carriage motor 32. The carriage 31 can reciprocate in the moving direction and is driven by a carriage motor 32. Further, the carriage 31 detachably holds an ink cartridge that stores ink.

  The head unit 40 is for ejecting ink onto the film sheet. The head unit 40 includes a head 41 having a plurality of nozzles. Since the head 41 is provided on the carriage 31 as the head unit 40, when the carriage 31 moves in the movement direction, the head 41 also moves in the movement direction. Then, dot lines (raster lines) along the moving direction are formed on the film sheet S by intermittently ejecting ink while the head 41B is moving in the moving direction. The internal structure of the head will be described later.

  The detector group 50 represents various detectors that detect information of each part of the printer 1 and send the information to the controller 60.

  The controller 60 is a control unit for controlling the printer. The controller 60 includes an interface unit 61, a CPU 62, and a memory 63. The interface unit 61 transmits and receives data between the computer 110 that is an external device and the printer 1. The CPU 62 is an arithmetic processing unit for controlling the entire printer. The memory 63 is for securing an area for storing a program of the CPU 62, a work area, and the like, and includes storage elements such as a RAM and an EEPROM. The CPU 62 controls each unit according to a program stored in the memory 63.

  The drive signal generation circuit 70 generates a drive signal for ejecting ink droplets by applying to a drive element such as a piezo element included in a head described later. The drive signal generation circuit 70 includes a DAC (not shown). Then, an analog voltage signal is generated based on digital data relating to the waveform of the drive signal sent from the controller 60. The drive signal generation circuit 70 also includes an amplifier circuit (not shown), and performs power amplification on the generated voltage signal to generate a drive signal.

  The ultraviolet irradiation unit 90 is an apparatus that irradiates ultraviolet rays to cure the aforementioned ultraviolet curable ink. In the present embodiment, the ultraviolet irradiation unit 90 is configured by an LED or the like and provided in the head 41. When the carriage unit 30 moves the head 41, the ultraviolet irradiation unit also moves in the moving direction of the head 41. The ultraviolet irradiation intensity of the ultraviolet irradiation unit 90 is controlled by the controller 60.

  FIG. 3 is an explanatory diagram of the nozzle arrangement in the head 41 of the head unit 40. Here, for ease of explanation, the nozzle row that can be seen only from the lower surface is shown to be observable from the upper portion.

In the head 41, a black ink nozzle row NK, a cyan ink nozzle row NC, a magenta ink nozzle row NM, a yellow ink nozzle row NY, and a white ink nozzle row NW are formed. Each nozzle row is provided with a plurality of (here, 360) nozzles that eject ink. A plurality of nozzles of each nozzle row are arranged at a constant nozzle pitch (here, 360 dpi) along the conveyance direction of the film sheet S.
The head 41 is provided with an ultraviolet irradiation unit 90 for curing the ultraviolet curing ink. The ultraviolet irradiation unit 90 is configured by an LED or the like that can irradiate ultraviolet rays.

  By providing the ultraviolet irradiation unit 90 in this way, dots are formed on the forward path in the moving direction of the head 41, and the dots are irradiated with ultraviolet light on the return path. The dots formed in the forward path are cured in the return path of the head 41. As will be described later, the irradiation intensity of the ultraviolet rays from the ultraviolet irradiation unit 90 can be changed according to the selected mode.

FIG. 4 is a diagram illustrating the structure of the head. In the figure, a nozzle Nz, a piezo element PZT, an ink supply path 402, a nozzle communication path 404, and an elastic plate 406 are shown.
Ink is supplied to the ink supply path 402 from an ink tank (not shown). These inks and the like are supplied to the nozzle communication path 404. A drive pulse of a drive signal described later is applied to the piezo element PZT. When the drive pulse is applied, the piezo element PZT expands and contracts according to the signal of the drive pulse and vibrates the elastic plate 406. An amount of ink droplets corresponding to the amplitude of the drive pulse is ejected from the nozzle Nz.

  FIG. 5 is a diagram illustrating the drive signal COM. The drive signal COM is repeatedly generated every repetition period T. A period T that is a repetition period corresponds to a period during which the head moves by one pixel in the film sheet S. For example, when the print resolution in the moving direction of the head is 360 dpi, the period T corresponds to a period for the head to move 1/360 inch. Then, based on the pixel data included in the print data, the fine vibration pulse PS1 or the drive pulse PS2 in each section included in the period T is applied to the piezo element PZT, so that dots are formed in one pixel. , Dots can be prevented from being formed.

  The drive signal COM has a fine vibration pulse PS1 generated in a section T1 in a repetition cycle and a drive pulse PS2. The fine vibration pulse PS1 is a pulse for finely vibrating the ink surface (ink meniscus) of the nozzle. When this pulse is applied, ink is not ejected from the nozzle. On the other hand, the drive pulse PS2 is a drive pulse for ejecting ink from the nozzles. When this pulse is applied, ink is ejected from the nozzle.

  In the drawing, Vh is shown as the amplitude of the drive pulse PS2. When this amplitude is increased, large size ink droplets are ejected, and when the amplitude is decreased, small size ink droplets are ejected.

FIG. 6 is a flowchart for explaining the printing process in the first embodiment.
First, an image to be printed and a print mode are selected (S102). Two images to be printed are selected, one being a first image and the other being a second image. Also, there are two types of print modes, a reflection mode and a transmission mode, which will be described later. Here, an image to be printed as the first image and an image to be printed as the second image are selected via the user interface of the computer 110. Also, either the reflection mode or the transmission mode is selected via the user interface.

Next, it is determined whether the selected mode is the reflection mode or the transmission mode (S104). When the reflection mode is selected, step S106 is executed, and when the transmission mode is selected, step S112 is executed.
When the reflection mode is selected, the image data is reconstructed so that the first image becomes a mirror image.

  FIG. 7 is a diagram for explaining a real image. FIG. 8 is a diagram for explaining a mirror image with respect to a real image. Each figure shows a pixel in which dots are formed, and the pixels in which dots are formed are hatched. For ease of explanation, the number of pixels in the printed film sheet S is reduced.

  In the present embodiment, when converting real image data to mirror image data, the image data is reconstructed into an image that is reversed left and right with the center in the width direction of the film sheet S as an axis. When FIG. 7 and FIG. 8 are compared, the dots to be formed are replaced with the center in the width direction of the film sheet S as an axis. In this way, the real image data is reconfigured to become mirror image data.

Next, printing is performed so as to overlap the film sheet S in the order of the first image, the background image, and the second image.
FIG. 9 is a diagram illustrating the ink overlapping order. In the figure, the order of dots formed so as to be superimposed on the film sheet S is shown. As shown in the figure, a first image (mirror image) is formed on the film sheet S, white ink is overcoated as a background image on the first image, and further, on the overcoated white ink. A second image (real image) is formed.

  By doing so, since the first image and the second image that are different from each other are printed while sandwiching the background image (white ink), the amount of information loaded on the film sheet by the image can be almost doubled. it can. Then, the film sheet itself can be saved and the space for installing the film sheet can be saved.

  On the other hand, if it is determined in step S104 that the transmission mode is selected (the reflection mode is not selected), printing is performed so that the first image, the background image, and the second image are superimposed on the film sheet S in this order. Done. At this time, the background image is printed so that the second image can be seen through from the first image side, or the first image can be seen through from the second image side (S112). The background image printed at this time is a background image having a higher transmission density than the background image when the reflection mode is selected.

  The transmission density (transmittance) is a characteristic obtained by measuring the transmission density of visible light on a medium on which a background image is printed, and increases as it easily transmits light. It can be measured with an existing optical transmission densitometer. When a background image is printed with the same ink, the transmission density can be increased by reducing the amount of printing ink of the background image per predetermined area of the medium. Also, when printing with different background color inks, the transmission density can be increased by using an ink with a small amount of white pigment contained in the ink. Is provided in the head, and the transmission density of the background image can be changed by selecting the nozzle row according to the mode and using it for printing. In the case of UV ink, the transmission density can also be changed by changing the irradiation conditions. In this embodiment, when the transmission density was measured, the transmission density of the background image (second background image) in the transmission mode was higher than that of the background image (first background image) in the reflection mode.

  FIG. 10A is a diagram illustrating ink overlap between the first image and the second image in the reflection mode, and FIG. 10B is a diagram illustrating ink overlap between the first image and the second image in the transmission mode. In the reflection mode in FIG. 10A, since the white ink almost completely covers the ink of the first image, it is difficult to visually recognize the first image (or the second image from the first image side) from the second image side. It has become. On the other hand, in the transmission mode in FIG. 10B, since the white ink does not completely cover the dots of the first image, the first image (or the second image from the first image side) is visually recognized from the second image side. It has become easier.

  In order to prevent the white ink from completely covering the dots of the first image, it can be realized by increasing the irradiation intensity of the ultraviolet rays after the landing of the white W than in the reflection mode. By making the irradiation intensity of the ultraviolet rays stronger than that in the reflection mode, the white W ink can be cured before spreading. By doing so, the first image can be seen through the second image, and the transmission mode can be realized.

  FIG. 10C is a diagram for explaining the overlap of ink in the first image and the second image in the transmission mode when white dots are thinned out. Compared to FIG. 10A, there is a place where the white W ink is not formed on the dots of the first image. Providing a portion where the white W ink is not formed on the dots of the first image can be realized by using image data of a background image that provides pixels where dots are not formed. By doing so, the first image can be seen through the second image, and the transmission mode can be realized.

  Further, if the ink amount per ink droplet, that is, the ink amount printed per pixel is the same, the higher the resolution, the larger the printed ink amount per predetermined area of the medium. In addition, even if the resolution is the same, if the amount of ink printed per pixel is large, the amount of printing ink per predetermined area of the medium increases. The above-mentioned resolution means that dots are formed in all the number of pixels per predetermined area defined by the resolution. Of the pixels defined by the resolution, the pixels that actually form the dots. The amount of printing ink per predetermined area of the medium can also be changed by changing the number. Furthermore, even when the background image has the same amount of ink to be printed per pixel and the same resolution, the amount of printing ink per predetermined area of the medium can be increased by printing a plurality of times repeatedly.

  Note that a process of reconstructing image data so that both the first image and the second image are mirror images may be inserted between step S104 and step S112. The method for reconstructing the image data of the mirror image is the same as the method shown in FIGS. By doing so, the first image and the second image can be viewed as real images when viewed from the first image side.

  Further, in each of the above-described modes, any one of the images can be used as additional information regarding the printed material, and the other image can be used as an image of the intended printed material. Further, as additional information, one image can be used as information relating to the other image, for example, a printing lot number. Furthermore, as additional information, one image can be used as an advertisement image.

Hereinafter, an operation in which the head of the printer 1 prints the first image, the background image, and the second image in the first embodiment will be described.
FIG. 11 is an explanatory diagram of band printing in the first embodiment. In the figure, a head composed of nozzle rows of white W, yellow Y, magenta M, cyan C, and black K is shown. Here, for ease of explanation, it is assumed that each nozzle row includes nine nozzles, and the nozzle numbers of # 1 to # 9 are shown. Further, on the right side of the head, which nozzle forms a dot on a raster line in each pass is shown.

  Referring to FIG. 9 again, the layer forming the first image is indicated by the symbol “1”, the layer forming the second image is indicated by the symbol “2”, and the layer forming the background image by the white ink is formed. The symbol “W” is shown in FIG. Also in this figure, these symbols correspond to each other, “1” is indicated for the nozzle that forms the first image, “2” is indicated for the nozzle that forms the second image, and the background using white ink “W” is shown for nozzles that form images. Note that nozzles without any of these symbols are unused nozzles.

  Further, in each pass, “1” is indicated for the nozzles forming the dots of the first image, “2” is indicated for the nozzles forming the dots of the second image, and the dots of the background image are represented by white ink. “W” is shown for the nozzles forming.

  In the following description, in each pass, ink is ejected in the forward path of the head 41, and ultraviolet light is irradiated from the ultraviolet irradiation unit 90 in the return path of the head 41, and the ejected ink is cured. And the intensity | strength of the ultraviolet-ray of the ultraviolet irradiation unit 90 changes with modes selected as mentioned above. That is, the intensity of ultraviolet rays is increased when the transmission mode is selected than when the reflection mode is selected.

  Referring to the figure, the printable area is after the seventh raster line. For example, in the seventh raster line to the ninth raster line, the dots of the first image are formed on the film sheet S by the YMCK nozzles # 7 to # 9 in pass 1. Here, every time one pass is completed, the film sheet S is conveyed by 3 nozzle pitches in the conveyance direction. The figure shows that the position of the raster line on which the dot is formed moves as indicated by the arrow in the figure so as to show that the film sheet S is relatively moved in the transport direction.

  In pass 2, the dots of the background image are formed on the first image by the white W nozzles # 4 to # 6. Further, in pass 3, the dots of the second image are formed on the background image by the YMCK nozzles # 1 to # 3. Thereafter, by performing the same printing, in the printable area, the first image is printed on the film sheet S, the background image is printed on the first image, and the second image is further printed on the background image. Can be printed.

  By doing so, when the reflection mode is selected, the first image can be viewed through the film sheet S, and the second image can be viewed from the opposite side. When the transmission mode is selected, the first image and the second image can be viewed from any direction.

  Although the degree of transmission of the background image by the white ink W is varied by varying the intensity of the ultraviolet light irradiated in the return path for each mode, as described above, white dots are formed by being thinned out. By using the image data of the background image, the degree of transmission of the background image by the white ink W may be varied.

  FIG. 12 is an explanatory diagram of interlaced printing according to the first embodiment. In the figure, a head composed of nozzle rows of white W, yellow Y, magenta M, cyan C, and black K is shown. Here, for ease of explanation, each nozzle row includes nine nozzles. Further, on the right side of the head, which nozzle forms a dot on a raster line in each pass is shown.

  Again, “1” is shown for the nozzle that forms the first image, “2” is shown for the nozzle that forms the second image, and “W” is shown for the nozzle that forms the background image with white ink. It is shown. Further, in each pass, “1” is indicated for the nozzles forming the dots of the first image, “2” is indicated for the nozzles forming the dots of the second image, and the dots of the background image are represented by white ink. “W” is shown for the nozzles forming.

  Also in the following description, in each pass, ink is ejected in the forward path of the head 41, and ultraviolet light is irradiated from the ultraviolet irradiation unit 90 in the return path of the head 41, and the ejected ink is cured. And the intensity | strength of the ultraviolet-ray of the ultraviolet irradiation unit 90 changes with modes selected as mentioned above. That is, the intensity of ultraviolet rays is increased when the transmission mode is selected than when the reflection mode is selected.

  Referring to the figure, the printable area is after the 31st raster line. For example, the order in which dots are formed will be described by paying attention to the 31st to 33rd raster lines.

  The dots of the first image are formed on the 33rd raster line on the film sheet S by the YMCK nozzle # 9 in pass 1. Here, every time one pass is completed, the film sheet S is conveyed by 3/4 nozzle pitch in the conveying direction.

  Then, in pass 2, the dots of the first image are formed on the 32nd raster line on the film sheet S by the YMCK nozzle # 8. In pass 3, the dots of the first image are formed on the 31st raster line on the film sheet S by the nozzle # 7 of YMCK. In pass 4, the dots of the first image are formed by the YMCK nozzle # 7 or the like. However, when attention is paid to the 31st to 33rd raster lines, no dots are formed on these raster lines.

  In pass 5, the white W nozzle # 6 forms a background image dot on the 33rd raster line on the first image. In pass 6, dots of the background image are formed on the 32nd raster line on the first image by the white W nozzle # 5. In pass 7, the white W nozzle # 4 forms background image dots on the 31st raster line on the first image. In pass 8, dots of the background image are formed by the white W nozzle 4 or the like. However, when attention is paid to the 31st to 33rd raster lines, no dots are formed on these raster lines.

  In pass 9, YMCK nozzle # 3 forms dots of the second image on the 33rd raster line on the background image. In pass 10, YMCK nozzle # 2 forms dots of the second image on the 32nd raster line on the background image. In pass 11, YMCK nozzle # 1 forms a second image dot on the 31st raster line on the background image.

  Thereafter, by performing the same printing, in the printable area, the first image is printed on the film sheet S, the background image is printed on the first image, and the second image is further printed on the background image. Can be printed.

  FIG. 13 is an explanatory diagram of microfeed printing in the first embodiment. In the figure, a head composed of nozzle rows of white W, yellow Y, magenta M, cyan C, and black K is shown. Here, for ease of explanation, it is assumed that each nozzle row includes nine nozzles, and the nozzle numbers of # 1 to # 9 are shown. Further, on the right side of the head, which nozzle forms a dot on a raster line in each pass is shown.

  Again, “1” is shown for the nozzle that forms the first image, “2” is shown for the nozzle that forms the second image, and “W” is shown for the nozzle that forms the background image with white ink. It is shown. Further, in each pass, “1” is indicated for the nozzles forming the dots of the first image, “2” is indicated for the nozzles forming the dots of the second image, and the dots of the background image are represented by white ink. “W” is shown for the nozzles forming.

  Also in the following description, in each pass, ink is ejected in the forward path of the head 41, and ultraviolet light is irradiated from the ultraviolet irradiation unit 90 in the return path of the head 41, and the ejected ink is cured. And the intensity | strength of the ultraviolet-ray of the ultraviolet irradiation unit 90 changes with modes selected as mentioned above. That is, the intensity of ultraviolet rays is increased when the transmission mode is selected than when the reflection mode is selected.

  Referring to the figure, the printable area is the 25th raster line and thereafter. For example, the order in which dots are formed will be described by paying attention to the 25th to 28th raster lines.

  The dots of the first image are formed on the 25th raster line on the film sheet S by the YMCK nozzle # 7 in pass 1. Here, every time one pass is completed, the film sheet S is conveyed by a 1/4 nozzle pitch in the conveyance direction.

  In pass 2, the dots of the first image are formed on the 26th raster line on the film sheet S by the nozzle # 7 of YMCK. In pass 3, the dots of the first image are formed on the 27th raster line on the film sheet S by the nozzle # 7 of YMCK. In pass 4, the dots of the first image are formed on the 28th raster line on the film sheet S by the nozzle # 7 of YMCK.

  In pass 5, a background W dot is formed on the 25th raster line on the first image by the white W nozzle # 4. In pass 6, the white W nozzle # 4 forms a background image dot on the 26th raster line on the first image. In pass 7, the white W nozzle # 4 forms dots of the background image on the 27th raster line on the first image. In pass 8, a white W nozzle # 4 forms a background image dot on the 28th raster line on the first image.

  In pass 9, the YMCK nozzle # 1 forms a second image dot on the 25th raster line on the background image. In pass 10, YMCK nozzle # 4 forms dots of the second image on the 26th raster line on the background image. In pass 11, YMCK nozzle # 4 forms a second image dot on the 27th raster line on the background image. In pass 12, YMCK nozzle # 4 forms dots of the second image on the 28th raster line on the background image.

  As described above, when dots for 12 passes are formed, the film sheet S is transported in the transport direction by 2 nozzle pitches and 1/4 nozzle pitch. Then, dot formation similar to that described above is repeated. In this way, in the printable area, the first image is printed on the film sheet S, the background image is printed on the first image, and the second image is printed on the background image. Can do.

  Further, as a modification of the above-described embodiment, one raster may be printed by a plurality of passes using the same block nozzle so that one raster hits the same block a plurality of times.

=== Second Embodiment ===
FIG. 14 is an explanatory diagram of band printing in the second embodiment. In the figure, a head composed of nozzle rows of white W, yellow Y, magenta M, cyan C, and black K is shown. Here, for ease of explanation, it is assumed that each nozzle row includes eight nozzles, and nozzle numbers # 1 to # 8 are shown. Further, on the right side of the head, which nozzle forms a dot on a raster line in each pass is shown.

  Also in the following description, in each pass, ink is ejected in the forward path of the head 41, and ultraviolet light is irradiated from the ultraviolet irradiation unit 90 in the return path of the head 41, and the ejected ink is cured. And the intensity | strength of the ultraviolet-ray of the ultraviolet irradiation unit 90 changes with modes selected as mentioned above. That is, the intensity of ultraviolet rays is increased when the transmission mode is selected than when the reflection mode is selected.

  Referring to the figure, the printable area is after the fifth raster line. For example, the order in which dots are formed will be described by paying attention to the fifth raster line to the eighth raster line.

  The dots of the first image are formed on the fifth raster line to the eighth raster line on the film sheet S by the YMCK nozzles # 5 to # 8 in pass 1. Next, the film sheet S is not conveyed in the conveying direction, and in the pass 2, dots of the background image are formed on the fifth raster line to the eighth raster line on the first image by the nozzles # 5 to # 8 of the white ink W. The Here, every time two passes are completed, the film sheet S is conveyed by 4 nozzle pitches in the conveying direction.

  In pass 3, YMCK nozzles # 1 to # 4 form dots of the second image on the fifth raster line to the eighth raster line on the background image. At this time, dots of the first image are formed on the ninth raster line to the twelfth raster line. In pass 4, no image is formed on the fifth raster line to the eighth raster line, but dots of the background image are formed on the ninth raster line to the twelfth raster line. And the film sheet S is conveyed by 4 nozzle pitch in a conveyance direction. Thereafter, the operations in passes 3 to 4 are repeated, so that in the printable area, the first image is printed on the film sheet, the background image is printed on the first image, and further, the first image is printed on the background image. Two images can be printed.

  FIG. 15 is an explanatory diagram of ink overlap in interlaced printing according to the second embodiment. In the figure, the order of dots formed so as to be superimposed on the film sheet S is shown. Here, the difference from FIG. 9 described above is that there are pixels in which dots cannot be formed in the layer where the first image is formed as a result of the first image being printed at a lower resolution than the second image. Is a point.

  FIG. 16 is an explanatory diagram of interlaced printing in the second embodiment. In the figure, a head composed of nozzle rows of white W, yellow Y, magenta M, cyan C, and black K is shown. Here, for ease of explanation, it is assumed that each nozzle row includes six nozzles, and nozzle numbers # 1 to # 6 are shown.

  Referring to the figure, the printable area is after the 19th raster line. For example, the order in which dots are formed will be described by paying attention to the 19th to 21st raster lines.

  In pass 1, the dots of the first image are formed on the 21st raster line on the film sheet S by the nozzle # 6 of YMCK. Here, the film sheet S is not transported after the dots of the first image are formed. Then, in pass 2, a background image dot is formed on the 21st raster line on the first image by the nozzle # 6 of the white ink W. Then, the film sheet S is conveyed by 3/4 nozzle pitch.

  In pass 3, a background image dot is formed on the 20th raster line on the film sheet S by the nozzle # 5 of the white ink W. Next, the film sheet S is conveyed by 3/4 nozzle pitch. In pass 4, dots of the background image are formed on the 19th raster line on the film sheet S by the nozzle # 4 of the white ink W. Then, the film sheet S is conveyed by 3/4 nozzle pitch.

  In pass 5, the dots of the background image are formed by the nozzle # 4 or the like of the white ink W, but when attention is paid to the 19th to 21st raster lines, no dots are formed on these raster lines. Also in pass 6, the dots of the first image are formed by the YMCK nozzle # 4 or the like, but when attention is paid to the 19th to 21st raster lines, no dots are formed on these raster lines. As described above, since the film sheet S is not transported after the first image is formed, the film sheet S is not transported here either.

  In pass 7, YMCK nozzle # 3 forms dots of the second image on the 21st raster line on the background image. Next, the film sheet is conveyed by 3/4 nozzle pitch. In pass 8, the YMCK nozzle # 2 forms dots of the second image on the 20th raster line on the background image. Next, the film sheet is conveyed by 3/4 nozzle pitch. In pass 9, the dot of the second image is formed on the 19th raster line on the background image by the nozzle # 1 of YMCK.

  Thereafter, by performing the same printing, in the printable area, the first image is printed on the film sheet S, the background image is printed on the first image, and the second image is further printed on the background image. Can be printed.

  In addition, by performing printing as described above, the density of dots in the first image can be made smaller than the density of dots in the second image, and the first image is printed with a lower resolution than the second image. be able to.

  FIG. 17 is an explanatory diagram of interlacing ink overlap when the resolution of the second image is low. In the figure, the order of dots formed so as to be superimposed on the film sheet S is shown. Again, the difference from FIG. 9 is that there are pixels in which dots cannot be formed in the layer where the second image is formed as a result of the second image being printed at a lower resolution than the first image. Is a point.

FIG. 18 is an explanatory diagram of interlaced printing when the resolution of the second image is low.
Also in the following description, in each pass, ink is ejected in the forward path of the head 41, and ultraviolet light is irradiated from the ultraviolet irradiation unit 90 in the return path of the head 41, and the ejected ink is cured. And the intensity | strength of the ultraviolet-ray of the ultraviolet irradiation unit 90 changes with modes selected as mentioned above. That is, the intensity of ultraviolet rays is increased when the transmission mode is selected than when the reflection mode is selected.

  Referring to the figure, the printable area is after the 19th raster line. For example, the order in which dots are formed will be described by paying attention to the 19th to 21st raster lines.

  In pass 1, the dots of the first image are formed on the 21st raster line on the film sheet S by the nozzle # 6 of YMCK. Then, the film sheet S is conveyed by 3/4 nozzle pitch. In the meantime, until the pass 7, the film sheet S is conveyed by 3/4 nozzle pitch for each pass.

  In pass 2, the dots of the first image are formed on the 20th raster line on the film sheet S by the nozzle # 5 of YMCK. In pass 3, the dots of the first image are formed on the 19th raster line on the film sheet S by the nozzle # 4 of YMCK. In pass 4, the dots of the first image are formed by the YMCK nozzle # 4 or the like. However, when attention is paid to the 19th to 21st raster lines, no dots are formed on these raster lines.

  In pass 5, a background image dot is formed on the 21st raster line of the first image by the nozzle # 3 of the white ink W. In pass 6, a background image dot is formed on the 20th raster line of the first image by the nozzle # 2 of the white ink W. In pass 7, a background image dot is formed on the 19th raster line on the first image by the nozzle # 1 of the white ink W. Here, the film sheet S is not transported immediately before the second image is formed. Since the second image is to be formed in the next pass, the film sheet S is not conveyed here.

  In pass 9, the second image dot is formed on the 19th raster line on the background image by the nozzle # 1 of YMCK.

Thereafter, by performing the same printing, in the printable area, the first image is printed on the film sheet S, the background image is printed on the first image, and the second image is further printed on the background image. Can be printed.
Further, by performing printing as described above, the density of dots in the second image can be made lower than the density of dots in the first image, and the second image is printed with a lower resolution than the first image. be able to.

  FIG. 19 is an explanatory diagram of microfeed printing in the second embodiment. In the figure, a head composed of nozzle rows of white W, yellow Y, magenta M, cyan C, and black K is shown. Again, for ease of explanation, each nozzle row includes six nozzles, and nozzle numbers # 1 to # 6 are shown.

  Referring to the figure, the printable area is after the 13th raster line. In microfeed printing in the second embodiment, dot formation in pass 1 to pass 10 is repeated. Here, the order in which dots are formed will be described focusing on the 13th to 16th raster lines.

  In pass 1, the dots of the first image are formed on the thirteenth raster line on the film sheet S by the nozzle # 4 of YMCK. The film sheet S is not transported between pass 1 and pass 2. In pass 2, a background image dot is formed on the 13th raster line on the first image by the nozzle # 4 of the white ink W. Then, the film sheet S is conveyed by 3/4 nozzle pitch.

  In pass 3, dots of the background image are formed on the fourteenth raster line on the film sheet S by the nozzle # 4 of the white ink W. Between pass 2 and pass 5, the film sheet S is conveyed by 3/4 nozzle pitch for each pass. Accordingly, here, the film sheet S is conveyed by a 3/4 nozzle pitch. In pass 4, dots of the background image are formed on the fifteenth raster line on the film sheet S by the nozzle # 4 of the white ink W. In pass 5, dots of the background image are formed on the 16th raster line on the film sheet S by the nozzle # 5 of the white ink W.

  After pass 5, the film sheet S is conveyed by 2 nozzles and 1/4 nozzle. In pass 6, the dots of the first image are formed by the YMCK nozzle # 4 or the like. However, when attention is paid to the 13th to 16th raster lines, no dots are formed on these raster lines. The film sheet S is not transported between pass 6 and pass 7.

  In pass 7, YMCK nozzle # 1 forms dots of the second image on the thirteenth raster line on the background image. Between pass 7 and pass 10, the film sheet S is conveyed by 3/4 nozzle pitch for each pass. In pass 8, the dots of the second image are formed on the 14th raster line on the background image by the nozzle # 1 of YMCK. In pass 9, the dots of the second image are formed on the 15th raster line on the background image by the nozzle # 1 of YMCK. In pass 10, the dots of the second image are formed on the sixteenth raster line on the background image by the nozzle # 1 of the nozzle # 1 of YMCK.

  After pass 10, the film sheet S is conveyed by 2 nozzles and 1/4 nozzle. Thereafter, the operations of pass 1 to pass 10 are repeated.

  In this way, in the printable area, the first image is printed on the film sheet S, the background image is printed on the first image, and the second image is printed on the background image. Can do. At this time, the density of dots in the first image can be made smaller than the density of dots in the second image, and the first image can be printed with a lower resolution than the second image.

  FIG. 20 is an explanatory diagram of microfeed printing when the resolution of the second image is low. Again, referring to the figure, the printable area is the 13th raster line and thereafter. In the microfeed printing here, the formation of dots in pass 1 to pass 10 is repeated. Here, the order in which dots are formed will be described focusing on the 13th to 16th raster lines.

In pass 1, the dots of the first image are formed on the thirteenth raster line on the film sheet S by the nozzle # 4 of YMCK. Between pass 1 to pass 4, the film sheet S is conveyed by a 1/4 nozzle pitch for each pass. In pass 2, the dots of the first image are formed on the fourteenth raster line on the film sheet S by the nozzle # 4 of YMCK. In pass 3, the dots of the first image are formed on the fifteenth raster line on the film sheet S by the nozzle # 4 of YMCK. In pass 4, the dots of the first image are formed on the 16th raster line on the film sheet S by the nozzle # 4 of YMCK.
After pass 4, the film sheet S is conveyed by 2 nozzle pitches and 1/4 nozzle pitch.

  In pass 5, a background image dot is formed on the 13th raster line on the first image by the nozzle # 1 of the white ink W. Between pass 5 and pass 8, the film sheet S is conveyed by 1/4 nozzle pitch for each pass. In pass 6, the background image dots are formed on the fourteenth raster line of the first image by the nozzle # 1 of the white ink W. In pass 7, a background image dot is formed on the fifteenth raster line on the first image by nozzle # 1 of white ink W. In pass 8, the first ink on the first image is formed by nozzle # 1 of white ink W. Background image dots are formed on 16 raster lines.

  After pass 8, the film sheet S is not conveyed. In pass 9, the YMCK nozzle # 1 forms dots of the second image on the thirteenth raster line on the background image. After pass 9, the film sheet S is conveyed by the 2 nozzle pitch and the 1/4 nozzle pitch. Thereafter, the operations of pass 1 to pass 9 are repeated.

  By doing in this way, it is possible to print the first image on the film sheet S in the printable area, print the background image on the first image, and further print the second image on the background image. it can. At this time, the density of dots in the second image can be made lower than the density of dots in the first image, and the second image can be printed with a lower resolution than the first image.

=== Third Embodiment ===
FIG. 21 is an explanatory diagram of band printing in the third embodiment. In the figure, a head composed of nozzle rows of white W, yellow Y, magenta M, cyan C, and black K is shown. Here, for ease of explanation, it is assumed that each nozzle row includes eight nozzles, and nozzle numbers # 1 to # 8 are shown. Further, on the right side of the head, which nozzle forms a dot on a raster line in each pass is shown.

  Also in the following description, in each pass, ink is ejected in the forward path of the head 41, and ultraviolet light is irradiated from the ultraviolet irradiation unit 90 in the return path of the head 41, and the ejected ink is cured. And the intensity | strength of the ultraviolet-ray of the ultraviolet irradiation unit 90 changes with modes selected as mentioned above. That is, the intensity of ultraviolet rays is increased when the transmission mode is selected than when the reflection mode is selected.

  In pass 1, dots of the first image are formed on the first raster line to the eighth raster line on the film sheet S by the YMCK nozzles # 1 to # 8. The film sheet S is not conveyed between pass 1 and pass 3. In pass 2, the dots of the background image are formed on the first raster line to the eighth raster line on the first image by the nozzles # 1 to # 8 of the white ink W. In pass 3, YMCK nozzles # 1 to # 8 form dots of the second image on the first raster line to the eighth raster line on the background image. Then, after the third pass, the film sheet S is conveyed by the pitch of 8 nozzles. Thereafter, the above-described operation is repeated. By doing so, it is possible to print the first image on the film sheet S, print the background image on the first image, and further print the second image on the background image.

  FIG. 22 is an explanatory diagram of interlaced printing according to the third embodiment. In the figure, a head composed of nozzle rows of white W, yellow Y, magenta M, cyan C, and black K is shown. Here, for ease of explanation, it is assumed that each nozzle row includes nine nozzles, and the nozzle numbers of # 1 to # 9 are shown. Further, on the right side of the head, which nozzle forms a dot on a raster line in each pass is shown.

  Referring to the figure, the printable area is after the seventh raster line. In interlaced printing in the third embodiment, dot formation in pass 1 to pass 9 is repeated. Here, the order in which dots are formed by focusing on the seventh raster line to the ninth raster line will be described.

  In pass 1, the dots of the first image are formed on the ninth raster line on the film sheet S by the nozzle # 9 of YMCK. The film sheet S is not transported between pass 1 and pass 3. In pass 2, a background image dot is formed on the ninth raster line of the first image by the nozzle # 9 of the white ink W. In pass 3, the dots of the second image are formed on the ninth raster line on the background image by the nozzle # 9 of YMCK. Here, the film sheet S is conveyed by 3 nozzle pitches every 3 passes. Therefore, the film sheet S is also conveyed by 3 nozzle pitches here.

  In pass 4, the dots of the first image are formed on the eighth raster line on the film sheet S by the nozzle # 5 of YMCK. The film sheet S is not conveyed between pass 4 and pass 6. In pass 5, the background image dots are formed on the eighth raster line on the first image by the nozzle # 5 of the white ink W. In pass 6, YMCK nozzle # 5 forms dots of the second image on the eighth raster line on the background image. And the film sheet S is conveyed by 3 nozzle pitch.

  In pass 7, the dots of the first image are formed on the seventh raster line on the film sheet S by the nozzle # 1 of YMCK. The film sheet S is not conveyed between the pass 7 and the pass 9. In pass 8, the white image W nozzle # 1 forms a background image dot on the seventh raster line on the first image. In pass 9, the dot of the second image is formed on the seventh raster line on the background image by the nozzle # 9 of the nozzle # 1 of YMCK. And the film sheet S is conveyed by 3 nozzle pitch. Thereafter, the operations of pass 1 to pass 9 are repeated.

  By doing so, it is possible to print the first image on the film sheet S, print the background image on the first image, and further print the second image on the background image.

  FIG. 23 is an explanatory diagram of microfeed printing in the third embodiment. Here too, for ease of explanation, each nozzle row includes nine nozzles, and the nozzle numbers of nozzles # 1 to # 9 are shown.

  Also in the following description, in each pass, ink is ejected in the forward path of the head 41, and ultraviolet light is irradiated from the ultraviolet irradiation unit 90 in the return path of the head 41, and the ejected ink is cured. And the intensity | strength of the ultraviolet-ray of the ultraviolet irradiation unit 90 changes with modes selected as mentioned above. That is, the intensity of ultraviolet rays is increased when the transmission mode is selected than when the reflection mode is selected.

  In pass 1, the dots of the first image are formed on the first raster line on the film sheet S by the nozzle # 1 of YMCK. The film sheet S is not conveyed between pass 1 and pass 3. In pass 2, the background image dots are formed on the first raster line on the first image by the nozzle # 1 of the white ink W. In pass 3, dots of the second image are formed on the first raster line on the background image. And the film sheet S is conveyed by 1 nozzle pitch in a conveyance direction.

  The operations of pass 1 to pass 3 described above are repeated in pass 4 to pass 12. By doing so, printing of the first raster line to the fourth raster line is performed. After pass 12, the film sheet S is conveyed by a pitch of 9 nozzles. Then, the operations of the above-described pass 1 to pass 12 are repeated.

  By doing so, it is possible to print the first image on the film sheet S, print the background image on the first image, and further print the second image on the background image.

=== Fourth Embodiment ===
FIG. 24 is a block diagram showing a configuration of a printing system 100 including the line printer 1 ′. In the line printer 1 ′, unlike the serial type ink jet printer 1, the head unit is fixed to the printer 1 ′. Then, an image is formed by ejecting ink from the head unit while transporting the film sheet S in the transport direction. Therefore, in FIG. 24, the carriage unit 30 for moving the head is omitted.

  FIG. 25 is a perspective view of the line printer 1 ′. In the figure, a head unit 40 ', a belt 24' for conveying the film sheet S, an upstream conveying roller 22A ', and a downstream conveying roller 22B' are shown. As shown in the figure, in the line printer 1, the film sheet S is moved in the transport direction by a belt 24 'that is moved by a transport roller.

  FIG. 26 is an explanatory diagram of the nozzle row unit 41 ′ in the line printer 1 ′. The head unit 40 'of the line printer 1' includes a plurality of nozzle row units 41 'having a plurality of nozzle rows for one color. Here, a nozzle row unit 41K ′ for black K is shown, but similar nozzle row units 41 exist for yellow Y, magenta M, cyan C, and white W.

  Each nozzle row unit 41 'includes a first nozzle row 42A to a sixth nozzle row 42F. As shown in the figure, by arranging a plurality of nozzle rows in a staggered arrangement, printing can be performed at once for the entire region in the width direction of the film sheet S.

  FIG. 27 is a diagram illustrating printing in the line printer 1 ′. In the figure, a nozzle row unit 41 ′ for each color and an ultraviolet irradiation unit 90 ′ provided between the nozzle row units are shown. The ultraviolet irradiation unit 90 'is configured by an LED or the like that can irradiate ultraviolet rays. The ink can be cured by irradiating the dots on the film sheet S with ultraviolet rays after each ink is ejected. Note that SL shown at the left end of the drawing is an ultraviolet irradiation unit for strong irradiation, which is provided in order to irradiate in the final finishing stage of printing and to fully cure all ink.

  According to such a configuration, the first image is formed by ejecting ink from each nozzle of YMCK while transporting the film sheet S in the forward transport direction. Then, while transporting the film sheet S in the reverse transport direction, ink is ejected from the nozzles of the white ink W to form a background image. Further, while the film sheet S is conveyed again in the normal conveyance direction, the second image is formed even if ink is ejected from each nozzle of YMCK.

  The intensity of the ultraviolet rays from the ultraviolet irradiation unit 90 when the background image is formed by ejecting ink from the nozzles of the white ink W varies depending on the selected mode. That is, the intensity of the ultraviolet light is increased when the transmission mode is selected than when the reflection mode is selected.

  By doing so, when the reflection mode is selected, the first image can be viewed through the film sheet S, and the second image can be viewed from the opposite side. When the transmission mode is selected, the first image and the second image can be viewed from any direction.

  Here, although the degree of transmission of the background image by the white ink W is varied by changing the intensity of the ultraviolet rays to be irradiated for each mode, as described above, the background in which white dots are formed by thinning out. By using the image data of the image, the degree of transmission of the background image by the white ink W may be varied.

  The white W head may be one, and two sets of YMCK color heads may be arranged on the upstream side and the downstream side in the transport direction with the white W head interposed therebetween. Then, the first image may be printed with the upstream YMCK color head, and the second image may be printed with the downstream YMCK color head. In this way, by switching the first image and the second image, it is possible to print in two modes with only one direction of conveyance.

=== Other Embodiments ===
In the above-described embodiment, the printer 1 has been described as the printing apparatus. However, the printer 1 is not limited to this, but is not limited to this. It is also possible to embody the present invention in a device that injects and discharges a fluid. For example, color filter manufacturing apparatus, dyeing apparatus, fine processing apparatus, semiconductor manufacturing apparatus, surface processing apparatus, three-dimensional modeling machine, gas vaporizer, organic EL manufacturing apparatus (especially polymer EL manufacturing apparatus), display manufacturing apparatus, film formation You may apply the technique similar to the above-mentioned embodiment to the various apparatuses which applied inkjet technology, such as an apparatus and a DNA chip manufacturing apparatus. These methods and manufacturing methods are also within the scope of application.

  The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

<About the head>
In the above-described embodiment, ink is ejected using a piezoelectric element. However, the method for discharging the liquid is not limited to this. For example, other methods such as a method of generating bubbles in the nozzle by heat may be used.

1 printer, 20 transport unit, 21 paper feed roller, 22 transport motor,
23 transport roller, 24 platen, 25 paper discharge roller,
30 carriage unit, 31 carriage, 40 head unit,
402, ink supply path, 404 nozzle communication path, 406 elastic plate,
50 detector groups, 60 controllers, 61 interfaces,
62 CPU, 63 memory, 70 drive signal generation circuit,
90 UV irradiation unit, 110 computer,
111 interface, 112 CPU, 113 memory,
S film sheet

Claims (8)

A device having a head for ejecting ink droplets from a nozzle and printing an image on a medium based on a selected mode;
The medium is a transparent medium;
When the first mode is selected, the head forms a first dot that forms a first image on the medium, and forms a first background image on at least a part of the first dot. Forming a background dot, forming a second dot forming a second image on the first dot and the first background dot on the first dot;
When the second mode is selected, the head forms a first dot that forms a first image on the medium, and a second background image forms a second background image on at least a part of the first dot. Forming a background dot, forming a second dot forming a second image on the first dot and the second background dot on the first dot;
By reducing the contact area between the first dot and the second background dot to be smaller than the contact area between the first dot and the first background dot, the transmission density in the second mode is transmitted in the first mode. Printing device that makes it higher than the density . The head is capable of printing the first background image and the second background image using ink having a property of curing when irradiated with ultraviolet rays,
The irradiation amount of the ultraviolet rays applied to definitive second background dots in the second mode, stronger than the irradiation amount of ultraviolet rays applied to the first background dot definitive in the first mode, the printing apparatus according to claim 1 .   2. The ejection amount of the ink droplet per predetermined area onto the medium in the second background image is made smaller than the ejection amount of the ink droplet per predetermined area onto the medium in the first background image. The printing apparatus as described in. In the first mode, a mirror image of the first image is printed, a real image of the second image is printed,
4. The printing apparatus according to claim 1, wherein in the second mode, both the first image and the second image are printed by one of a real image and a mirror image.   5. The printing apparatus according to claim 1, wherein a printing resolution of the first image and a printing resolution of the second image are different in the first mode. A transport unit that transports the medium in the transport direction;
The head is guided to move along a moving direction intersecting the transport direction;
The head is provided with a plurality of nozzles along the transport direction,
A transport operation for transporting the medium in the transport direction by the transport unit and a dot formation operation for forming dots on the medium by ejecting ink droplets from the nozzles while moving the head in the movement direction are repeated. The image is printed,
The printing apparatus according to claim 5, wherein the print resolution is a print resolution in the transport direction.   The printing apparatus according to claim 1, further comprising a moving mechanism that moves a relative position between the medium and the head in a direction intersecting a nozzle row direction in which the nozzles are arranged. A method for printing an image on a transparent medium using a head for ejecting ink droplets,
Forming a first dot for forming a first image on the medium, forming a first background dot for forming a first background image on at least a part of the first dot, the first dot and the first dot; Forming a second dot that forms a second image on the first background dot above the one dot;
Forming a first dot for forming a first image on the medium ; forming a second background dot for forming a second background image on at least a part of the first dot; Forming a second dot forming a second image on the second background dot on one dot;
If you can
By reducing the contact area between the first dot and the second background dot to be smaller than the contact area between the first dot and the first background dot, the transmission density of the second background image is set to the first background image. A printing method in which the transmission density is higher .

Images