JP2014051100A - Liquid spraying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid spraying method by which color development properties and glossiness of a recorded image etc. can be further improved, by using white-based liquid and gloss-based liquid, and to provide a liquid spraying device for materializing the liquid spraying method.SOLUTION: A first nozzle array 28a has: a white base correspondence nozzle group (W); and a gloss base correspondence nozzle group (S), and the first nozzle array 28a is arranged on the front side in a forward path direction which is a first relative movement direction with a recording medium such as a recording sheet 6 in a recording head 3. A second nozzle array 28b has: a white base correspondence nozzle group: and a gloss base correspondence nozzle group, and the second nozzle array 28b is arranged on the rear side in the forward path direction in the recording head. The liquid spraying device sprays white ink from the white base correspondence nozzle group of the second nozzle array after spraying the silver ink from the gloss base correspondence nozzle group of the first nozzle array in movement on the forward path, and sprays the white ink from the white base correspondence nozzle group of the first nozzle array after spraying the silver ink from the gloss base correspondence nozzle group of the second nozzle array in movement on the return path .

Description

  The present invention relates to a liquid ejecting apparatus including, for example, an ink jet recording head, and more particularly to a liquid ejecting apparatus using a white liquid and a glossy liquid.

  The liquid ejecting apparatus includes a liquid ejecting head and ejects various liquids from the liquid ejecting head. A typical example of the liquid ejecting apparatus includes an ink jet recording head (hereinafter simply referred to as a recording head) as a liquid ejecting head, and a recording medium (landing target) such as a recording paper as a landing target from the recording head. And an ink jet recording apparatus (hereinafter simply referred to as a printer) that records an image or the like by ejecting and landing liquid ink as droplets to form dots. . In recent years, this liquid ejecting apparatus is applied not only to an image recording apparatus but also to various manufacturing apparatuses such as a display manufacturing apparatus.

  Recent printers use inks of special colors in addition to black (K), cyan (C), magenta (M), and yellow (Y), which are the basic colors for character and image formation. Some of them are adapted for various applications. For example, the printer disclosed in Patent Document 1 is configured so that recording can be performed using white ink containing a white pigment or silver ink containing a metal pigment. By using these white ink and silver ink to record an image or the like, a wider color expression can be achieved.

JP 2009-126071

  By the way, a more effective recording method using white ink or silver ink and an apparatus configuration thereof have not been proposed.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a liquid jet capable of further improving the color development and gloss of a recorded image or the like using a white liquid and a gloss liquid. To provide an apparatus.

The present invention has been proposed in order to achieve the above object, and has a nozzle row in which a plurality of nozzles are provided, and causes pressure fluctuations in the liquid in the pressure chamber by driving the pressure generating means. A liquid ejecting head that ejects liquid from a nozzle using pressure fluctuations and landes the liquid on a landing target;
A liquid ejecting apparatus that ejects at least a white liquid and a glossy liquid from the liquid ejecting head while relatively moving the liquid ejecting head and the landing target in a direction intersecting the nozzle row, and causes the liquid to land on the landing target. There,
The first nozzle row includes a white-corresponding nozzle group that ejects a white-based liquid and a gloss-corresponding nozzle group that ejects a gloss-based liquid, and the first relative movement direction of the liquid ejecting head with respect to the landing target Placed on the other side of
The second nozzle row has a white group corresponding nozzle group and a glossy group corresponding nozzle group, and is disposed on the rear side in the first relative movement direction in the liquid jet head,
In the movement in the first relative movement direction, after the glossy liquid is ejected from the glossy corresponding nozzle group of the first nozzle row, the white liquid is jetted from the white corresponding nozzle group of the second nozzle row. ,
In the movement in the second relative movement direction opposite to the first relative movement direction, after the glossy liquid is ejected from the glossy corresponding nozzle group of the second nozzle row, the white color of the first nozzle row A white liquid is ejected from the system-compatible nozzle group.

  According to the present invention, in the movement in the first relative movement direction, after the glossy liquid is ejected from the glossy corresponding nozzle group of the first nozzle row, the white system is discharged from the white corresponding nozzle group of the second nozzle row. In the movement in the second relative movement direction after ejecting the liquid, after ejecting the glossy liquid from the glossy corresponding nozzle group of the second nozzle row, the white system from the white corresponding nozzle group of the first nozzle row Since it is configured to eject liquid, it is formed by overlapping the white layer on the previously formed gloss layer while alternately ejecting the glossy liquid and the white liquid by bidirectional relative movement Can be recorded. As a result, the ground color to be landed is covered and concealed by the glossy layer, and the white layer is formed on the glossy layer as a base, so that the glossiness of the glossy layer is obtained in the white color of the white layer. Thereby, compared with the case where a white layer is directly formed on the landing target, the brightness of the white layer can be increased, and as a result, white color development can be made more conspicuous.

In the above configuration, in the first nozzle row, when the landing target is transported in a direction crossing the relative movement direction, the glossy-corresponding nozzle group is disposed on the upstream side in the transport direction, and the downstream in the same direction. A white group of nozzles is arranged on the side,
In the second nozzle row, it is desirable to employ a configuration in which a white-corresponding nozzle group is disposed on the upstream side in the transport direction of the landing target, and a gloss-corresponding nozzle group is disposed on the downstream side in the same direction.

  According to this configuration, after the recording with respect to the landing target is performed while alternately ejecting the glossy liquid and the white liquid while moving in the first relative movement direction, the landing target is the length of one nozzle group. As a result, the glossy liquid and the white liquid are alternately ejected while being moved in the second relative movement direction, so that the recording on the landing target can be performed. That is, it is possible to perform recording efficiently in both directions.

  Furthermore, in the above configuration, it is desirable to adopt a configuration in which the first nozzle row and the second nozzle row are adjacent to each other without any other nozzle row being disposed therebetween.

In addition, the present invention has a nozzle row in which a plurality of nozzles are arranged, and pressure fluctuation is generated in the liquid in the pressure chamber by driving the pressure generating means, and the liquid is ejected from the nozzle using the pressure fluctuation. A liquid ejecting head for landing the liquid on the landing target,
A liquid ejecting apparatus that ejects at least a white liquid and a glossy liquid from the liquid ejecting head while relatively moving the liquid ejecting head and the landing target in a direction intersecting the nozzle row, and causes the liquid to land on the landing target. There,
The first nozzle row includes a white-corresponding nozzle group that ejects a white-based liquid and a gloss-corresponding nozzle group that ejects a gloss-based liquid, and the first relative movement direction of the liquid ejecting head with respect to the landing target Placed on the other side of
The second nozzle row has a white group corresponding nozzle group and a glossy group corresponding nozzle group, and is disposed on the rear side in the first relative movement direction in the liquid jet head,
In the movement in the first relative movement direction, after the white liquid is ejected from the white corresponding nozzle group of the first nozzle row, the gloss liquid is ejected from the gloss corresponding nozzle group of the second nozzle row. ,
In the movement in the second relative movement direction opposite to the first relative movement direction, after the white liquid is ejected from the white corresponding nozzle group of the second nozzle row, the gloss of the first nozzle row The glossy liquid is ejected from the system-compatible nozzle group.

  According to the present invention, in the movement in the first relative movement direction, after the white liquid is ejected from the white system corresponding nozzle group of the first nozzle row, the gloss system from the gloss system corresponding nozzle group of the second nozzle row is used. In the movement in the second relative movement direction opposite to the first relative movement direction after ejecting the liquid, the white nozzle is ejected from the white corresponding nozzle group of the second nozzle row, and then the first nozzle Because the glossy liquid is ejected from the glossy-compatible nozzle group in the row, the white color formed first on the landing target while alternately ejecting the white liquid and the glossy liquid by bidirectional relative movement Recording can be performed in which a glossy layer is formed on the layer. Thereby, the ground color of the landing target is covered and concealed by the white layer, and since the gloss layer is formed on the white layer as a base, compared with the case where the gloss layer is directly formed on the landing target, The brightness of the gloss layer can be increased, and as a result, the metallic gloss of the gloss layer can be made more prominent.

In the above configuration, in the first nozzle row, the white-corresponding nozzle group is disposed on the upstream side in the transport direction when the landing target is transported in the direction intersecting the relative movement direction, and the downstream in the same direction. A glossy nozzle group is placed on the side,
In the second nozzle row, it is desirable to adopt a configuration in which a glossy corresponding nozzle group is arranged on the upstream side in the conveyance direction of the landing target and a white corresponding nozzle group is arranged on the downstream side in the same direction.

  According to this configuration, after the recording on the landing target is performed while the white liquid and the glossy liquid are alternately ejected while moving in the first relative movement direction, the landing target is the length of one nozzle group. Is conveyed downstream by an amount corresponding to the above, it is possible to perform recording on the landing target while alternately ejecting the white liquid and the gloss liquid while moving in the second relative movement direction. That is, it is possible to perform recording efficiently in both directions.

  Furthermore, in the above configuration, it is desirable to adopt a configuration in which the first nozzle row and the second nozzle row are adjacent to each other without any other nozzle row being disposed therebetween.

FIG. 3 is a perspective view illustrating a configuration of a printer. FIG. 3 is a partially enlarged cross-sectional view of a recording head. It is a schematic diagram explaining arrangement | positioning of a nozzle row. 2 is a block diagram illustrating an electrical configuration of a printer. FIG. It is a figure explaining the drive signal generated from a drive signal generating circuit. (A) is a schematic diagram explaining the state of the printing process at the time of an outward trip, (b) is a schematic diagram explaining the state of the printing process at the time of a return pass. It is an enlarged view of the area | region X in FIG. It is a schematic diagram explaining arrangement | positioning of the nozzle row in 2nd Embodiment. It is a schematic diagram explaining the mode of the printing process in 2nd Embodiment. FIG. 10 is an enlarged view of a region X in FIG. 9.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the embodiments described below, various limitations are made as preferred specific examples of the present invention. However, the scope of the present invention is not limited to the following description unless otherwise specified. However, the present invention is not limited to these embodiments. In the present embodiment, an image recording apparatus that is one form of a liquid ejecting apparatus, specifically, an ink jet printer (hereinafter referred to as a printer) equipped with an ink jet recording head (hereinafter simply referred to as a recording head) as a liquid ejecting head. Will be described as an example.

  First, the overall structure of the printer 1 will be described with reference to FIG. The illustrated printer 1 includes a carriage 4 provided with a cartridge mounting portion 2 and a recording head 3 (a kind of the liquid ejecting head of the present invention). The carriage 4 is supported by a guide rod 5 so as to be movable in the width direction (main scanning direction) of the recording paper 6. A timing belt 9 is connected to the carriage 4 between a drive pulley 7 and an idle pulley 8. The drive pulley 7 is joined to the rotation shaft of the pulse motor 10. Therefore, the carriage 4 moves in the width direction of the recording paper 6 (a kind of recording medium, a kind of landing target in the present invention) by the operation of the pulse motor 10. In one end region within the movement range of the carriage 4, a home position is set which is positioned during standby when the recording head 3 does not perform a recording operation on the recording paper 6. At the home position, a wiper mechanism 12 for cleaning the surface of the nozzle plate 11 (see FIG. 2) of the recording head 3 and a capping mechanism 13 capable of sealing the nozzle forming surface are disposed.

  Although various recording heads can be used, in this embodiment, the recording head 3 illustrated in FIG. The recording head 3 includes a transducer unit 15, a case 16 that can store the transducer unit 15, a flow path unit 17 that is joined to the front end surface of the case 16, and the like.

  The case 16 is a block-like member having a storage space 18 for storing the vibrator unit 15 and is produced by molding a resin (epoxy resin or the like), for example. The vibrator unit 15 includes a plurality of piezoelectric vibrators 19 formed in a comb shape, a fixed plate 20 to which the piezoelectric vibrators 19 are joined, and a drive signal and the like for supplying the piezoelectric vibrators 19 to each other. And a flexible cable 21.

  The piezoelectric vibrator 19 is a kind of pressure generating means. The piezoelectric vibrator 19 of the present embodiment is a laminated piezoelectric vibrator manufactured by, for example, cutting a piezoelectric plate in which piezoelectric layers and electrode layers are alternately laminated into a comb-like shape, and in the stacking direction. This is a longitudinal vibration mode piezoelectric vibrator capable of expanding and contracting in an orthogonal direction. The fixing plate 20 is a metal plate that can receive the reaction force from the piezoelectric vibrator 19. The flexible cable 21 is a flexible film-like wiring member. The terminal portion on one end side of the flexible cable 21 is soldered to the terminal portion of the piezoelectric vibrator 19, and the terminal portion on the other end side is soldered to the terminal portion of the wiring board 22.

  When an electric field is applied to the piezoelectric layer constituting the piezoelectric vibrator 19, that is, when a drive signal is supplied through the flexible cable 21, the free end portion is in the element longitudinal direction (direction perpendicular to the stacking direction). Extends and contracts. For example, when the vibrator potential is increased by charging, the piezoelectric vibrator 19 contracts in the element longitudinal direction, and when the vibrator potential is lowered by discharging, the piezoelectric vibrator 19 extends in the element longitudinal direction.

  The flow path unit 17 is a plate-like member having a series of individual liquid flow paths from the liquid supply port 23 through the pressure chamber 24 to the nozzle 25. The flow path unit 17 seals the flow path forming substrate 26 having voids and grooves to be the pressure chambers 24 and the liquid supply ports 23 and the openings of these voids and grooves to seal the pressure chambers 24 and the liquid supply. An elastic plate 27 that partitions a part of the opening 23 and a nozzle plate 11 in which a plurality of nozzles 25 are formed are provided. The elastic plate 27 is bonded to one surface of the flow path forming substrate 26, that is, the surface on the case side, and the nozzle is formed on the other surface of the flow path forming substrate 26, that is, the surface opposite to the elastic plate bonding surface. The plate 11 is joined. The configuration of the nozzle plate 11 will be described later.

  The elastic plate 27 has a double structure in which the elastic film 30 is laminated on the surface of the support plate 29. In the present embodiment, a composite plate material in which a stainless steel plate, which is a kind of metal plate, is used as a support plate 29, and a resin film made of PPS (polyphenylene sulfide) or PI (polyimide) is laminated as an elastic film 30 on the surface of the support plate 29. The elastic plate 27 is produced using The elastic plate 27 is provided with a diaphragm portion that changes the pressure chamber volume. The elastic plate 27 is provided with a compliance portion that seals a part of the common liquid chamber 40.

  The diaphragm portion is produced by partially removing the support plate 29 by etching or the like. That is, the diaphragm portion includes an island portion 31 to which the distal end surface of the piezoelectric vibrator 19 is joined and a thin elastic portion 32 surrounding the island portion 31. The compliance part is a part for absorbing the pressure fluctuation of the liquid stored in the common liquid chamber 40. This damper portion is also produced by removing the support plate 29 in the region facing the opening surface of the storage void portion by etching or the like to make only the elastic film 30.

  And since the front end surface of the piezoelectric vibrator 19 is joined to said island part 31, a pressure chamber volume can be changed by expanding / contracting a free end part. For example, when the piezoelectric vibrator 19 is charged and the free end portion is contracted in the element longitudinal direction, the island portion 31 is pulled. Thereby, the island part 31 moves and the pressure chamber volume can be increased compared with the discharge state of the piezoelectric vibrator 19. In addition, when the charged piezoelectric vibrator 19 is discharged to extend the free end portion in the element longitudinal direction, the island portion 31 is pushed toward the pressure chamber 24 side. Thereby, the pressure chamber volume can be reduced as compared with the charged state of the piezoelectric vibrator 19.

  The cartridge mounting unit 2 is provided with a supply needle unit 33. The supply needle unit 33 is connected to a liquid cartridge 34 (a kind of liquid supply source) that stores liquid, and the liquid stored in the liquid cartridge 34 via the supply needle unit 33 enters the recording head 3. Supplied. The liquid supply source is not limited to the liquid cartridge 34, and a liquid storage pack (a bag body storing liquid) may be used. Further, a configuration in which a liquid supply source such as the liquid cartridge 34 is disposed on the main body side of the printer 1 and ink is supplied from the liquid supply source to the recording head 3 through an ink supply tube may be employed.

  The supply needle unit 33 in the present embodiment is generally configured by a liquid supply needle 35 and a needle holder 36. The liquid supply needle 35 is a member inserted into the liquid cartridge 34, and introduces the liquid stored in the liquid cartridge 34 into the needle. The tip of the liquid supply needle 35 is pointed in a conical shape, and a plurality of liquid introduction holes communicating with the inside and outside of the needle are formed. The needle holder 36 is a member for attaching the liquid supply needle 35, and a pedestal 37 for fixing the root portion of the liquid supply needle 35 is formed on the surface thereof.

  The supply needle unit 33 is disposed on the mounting surface of the case 16. In this arrangement state, the liquid outlet and the connection protrusion of the case 16 are communicated in a liquid-tight state via the packing 38. A liquid supply path 39 that penetrates through the case 16 is formed inside the connection protrusion. The liquid supply path 39 communicates with the common liquid chamber 40 of the flow path unit 17. Accordingly, the liquid stored in the liquid cartridge 34 flows into the common liquid chamber 40 through the liquid supply path 39.

  In the recording head 3 and the supply needle unit 33, a series of liquid flow paths from the liquid supply needle 35 to the nozzle 25 through the common liquid chamber 40 and the pressure chamber 24 are formed. When the piezoelectric vibrator 19 is operated, the pressure chamber volume can be changed as described above. Due to the change in the pressure chamber volume, the pressure in the liquid in the pressure chamber 24 changes, so that the liquid pressure in the pressure chamber 24 can be changed, and droplets can be ejected from the nozzle 25. For example, when the piezoelectric vibrator 19 is charged to expand the pressure chamber 24 and then the piezoelectric vibrator 19 is rapidly discharged to contract the pressure chamber 24, the pressure chamber 24 expands and flows into the pressure chamber 24. The liquid is rapidly pressurized, and droplets are ejected from the nozzle 25.

  For example, pigment ink is used as the ink ejected by the printer 1. This ink is adjusted so that the pigment concentration, the humectant concentration, and the like are suitable for applications such as image printing. In this embodiment, black ink (K), cyan ink (C), magenta ink (M), yellow ink (Y), white ink (W), and silver ink (S) are used in a total of six colors. . As these inks, it is desirable to use ultraviolet curable ink (UV ink: a kind of photocurable liquid). The difference between UV curable ink and ordinary water-based ink is that after landing on a recording medium (landing target), the ink is cured by irradiating the landing position with UV light from UV irradiation means (not shown). By doing so, stable printing quality can be secured without being influenced by the physical properties of the recording medium such as ink permeability.

  Here, the white ink is an ink containing a white pigment and is a kind of white liquid in the present invention. For example, titanium dioxide can be suitably used as the white pigment. The silver ink is an ink containing a glossy pigment and is a kind of glossy liquid in the present invention. As the glossy pigment, for example, a powdery or pasty metal pigment made of a metal such as aluminum, or a pearl pigment made of titanium mica whose surface is coated with a metal oxide can be used. The printer 1 is configured to obtain a special visual effect on a recorded image using these white ink and silver ink. This point will be described later.

Next, allocation of each color ink to the nozzle row will be described.
FIG. 3 is a plan view illustrating the configuration of the nozzle plate 11. In the drawing, the horizontal direction is the main scanning direction, the right side is the home position side (HP), and the left side is the recording area side (RP). In addition, the vertical direction in the figure is the sub-scanning direction (the conveyance direction of the recording paper 6), the lower side is the upstream side (UR), and the upper side is the downstream side (LR). The nozzle plate 11 is a thin plate made of metal or the like on which a plurality of nozzles 25 are formed at a pitch corresponding to the dot formation density. In the nozzle plate 11 in this embodiment, a plurality of nozzles 25 are provided in a direction corresponding to the sub-scanning direction to form a nozzle row 28, and a plurality of nozzle rows 28 are provided in a direction corresponding to the main scanning direction. 6 are formed in six rows. One nozzle row is composed of, for example, 360 nozzles 25 opened at a pitch corresponding to 360 dpi. In the present embodiment, the first nozzle row 28a corresponding to the white ink (W) and the silver ink (S), the second nozzle row 28b corresponding to the white ink (W) and the silver ink (S), and the yellow ink. The third nozzle row 28c corresponding to (Y), the fourth nozzle row 28d corresponding to magenta ink (M), the fifth nozzle row 28e corresponding to cyan ink (C), and the black ink (K) Are aligned in a direction corresponding to the main scanning direction.

  Here, when the recording head 3 travels in the main scanning direction, the first nozzle row 28a is on the front side (the side where the landing target and the position on the plane first overlap in relative movement) and the second nozzle row 28b is on the rear side. On the other hand, during the return path, the relative position is such that the second nozzle row 28b is on the front side and the first nozzle row 28a is on the rear side. The first nozzle row 28a includes two nozzle groups, an upstream half (180 nozzles) in the sub-scanning direction (shown by black circles in the drawing) and a downstream half (180 nozzles) in the same direction. The liquid flow paths of both nozzle groups are also separated from each other. The nozzle group disposed on the upstream side ejects silver ink (S), and the nozzle group disposed on the downstream side is configured to eject white ink (W). Therefore, the upstream nozzle group of the first nozzle row 28a corresponds to a glossy corresponding nozzle group, and the downstream nozzle group corresponds to a white corresponding nozzle group. Similarly, in the second nozzle row 28b, the nozzle group arranged on the upstream side ejects white ink (W), and the nozzle group arranged on the downstream side (indicated by a black circle in the drawing) is silver ink (S). Is configured to inject fuel. The upstream nozzle group of the second nozzle row 28b corresponds to a white-corresponding nozzle group, and the downstream nozzle group corresponds to a glossy-corresponding nozzle group. And the 1st nozzle row 28a and the 2nd nozzle row 28b are arrange | positioned in the state adjacent without the other nozzle row being arrange | positioned between both. In addition, the first nozzle row 28a and the second nozzle row 28b are disposed at the same position in the main scanning direction. For example, an arrangement in which the second nozzle row 28b is shifted by a half pitch with respect to the nozzle pitch of the first nozzle row 28a cannot be employed. The reason for this arrangement is that in the present embodiment, after the silver ink is ejected, the white ink is ejected and landed on the landing position of the silver ink. Details of this point will be described later.

  Next, the electrical configuration of the printer 1 will be described. As shown in FIG. 4, the printer 1 is generally configured by a printer controller 44 and a print engine 45.

  The printer controller 44 includes a control unit 46 (a kind of control means) having a CPU, a ROM, and a RAM, and a drive signal generation circuit 47 (a kind of drive signal generation means) that generates a drive signal to be supplied to the recording head 3. Etc. On the other hand, the print engine 45 includes a pulse motor 10 (a kind of relative movement means), a paper feed motor 48 (a kind of landing target conveying means), the recording head 3 and the like. The operation of each of these units can be controlled by the control unit 46 described above.

  The control unit 46 is a part that performs control in the printer 1. Since the control unit 46 is electrically connected to the contact terminal 50, it can read various information stored in the contact ROM 49 of the mounted liquid cartridge 34. Therefore, the controller 46 can recognize the type of ink stored in the liquid cartridge 34 based on the read information. Further, the control unit 46 can rewrite various information stored in the contact ROM 49.

  The control unit 46 generates dot pattern data for controlling the recording head 3 based on print data transmitted from an external device such as a host computer. Then, the control unit 46 transfers the generated dot pattern data to the recording head 3. The control unit 46 also functions as a drive signal setting unit, sets a drive signal having a waveform suitable for printing an image or the like, and generates the drive signal from the drive signal generation circuit 47. Further, the control unit 46 operates the pulse motor 10 to move the carriage 4 (recording head 3) to a desired position, or operates the paper feed motor 48 to send out the recording paper 6.

  The drive signal generation circuit 47 functions as drive signal generation means, and generates a drive signal to be supplied to the recording head 3 under the control of the control unit 46. As shown in FIG. 5, the drive signal generation circuit 47 of the present embodiment can generate two types of drive signals COM1 and COM2 at the same time.

  Hereinafter, each drive signal will be described. The first drive signal COM1 is a unit cycle in which the first drive pulse DP1 set so as to increase the droplet ejection amount as much as possible is a repetition cycle of the drive signal and is divided by a timing signal such as a latch pulse. It is a series of signals that are generated at equal intervals in the inside. The first drive pulse DP1 is a drive pulse in which the drive voltage, that is, the potential difference between the maximum potential and the minimum potential is set as high as possible to the extent that the piezoelectric vibrator 19 can tolerate. Each time one first drive pulse DP1 is supplied to the piezoelectric vibrator 19, a maximum amount of ink droplets is ejected from the nozzle 25. In the present embodiment, the first drive pulse DP1 is used when mainly ejecting silver ink.

  The second drive signal COM2 is a series of signals for generating three second drive pulses DP2 at regular intervals within a unit period, as shown in FIG. The second drive pulse DP2 is a drive pulse set so that the amount of ink droplets ejected is smaller than that in the case of the first drive pulse DP1, and the basic waveform shape is the first drive pulse. Same as DP1. However, the second drive pulse DP2 is different in that the drive voltage is set lower than the first drive pulse DP1. In the present embodiment, the second drive pulse DP2 is used when ejecting ink other than silver ink. The first drive pulse DP1 and the second drive pulse DP2 are configured to have different drive voltages, but are not limited thereto. For example, the amount of ink droplets ejected by the second drive pulse DP2 is set by making the drive voltages the same and making the slope of the potential change of the second drive pulse DP2 gentler than that of the first drive pulse DP1. However, it may be less than in the case of the first drive pulse DP1.

  Next, a printing process using silver ink and white ink in the printer 1 having the above configuration will be described. In this printing process, silver ink is first ejected onto a recording medium such as recording paper 6 and recording is performed using a silver ink layer (a kind of glossy layer) as a base, and then white ink is ejected onto the silver ink layer. A white ink layer (a type of white layer) is overlaid.

  When the power is turned on, the control unit 46 performs a predetermined initialization operation. In this initialization operation, the carriage 4 is moved in the main scanning direction to recognize the position of the carriage 4 (recording head 3) or clear unnecessary information in the work area. When the initialization operation is performed, the control unit 46 controls the pulse motor 10 and the paper feed motor 48 to move the carriage 4 in the main scanning direction (corresponding to the relative movement direction in the present invention) and to move the recording paper 6 to the sub-direction. Send out in the scanning direction (corresponding to the transport direction in the present invention). Further, the control unit 46 controls the supply of the first drive pulse DP1 and the second drive pulse DP2 to the piezoelectric vibrator 19 in synchronization with the movement of the carriage 4 and the recording paper 6.

  FIG. 6A shows the forward direction (corresponding to the first relative movement direction) in which the recording head 3 ejects ink from the nozzle 25 while moving from one home position side to the other side in the main scanning direction. It is a schematic diagram explaining the mode of a printing process (recording process). FIG. 7 is an enlarged view of a region X in FIG. As shown in FIG. 6A, in the forward path, the silver ink is ejected from the glossy-system-compatible nozzle group (S) arranged on the upstream side in the sub-scanning direction of the first nozzle row 28a by the first ejection pulse DP1. Then, it lands on a predetermined position of the recording paper 6. Thereby, a silver ink layer 51 is formed on the recording paper 6. Thereafter, at the timing when the recording head 3 moves by the interval between the adjacent nozzle rows, the white ink from the white-corresponding nozzle group arranged upstream in the sub-scanning direction of the second nozzle row 28b by the second drive pulse DP2. Are ejected and land on the previously formed silver ink layer 51. Thereby, as shown in FIG. 7, the white ink layer 52 is formed on the silver ink layer 51 so as to overlap. In this way, the forward printing process is performed while silver ink and white ink are alternately and repeatedly ejected from the recording head 3.

  FIG. 6B shows a return direction (corresponding to a second relative movement direction) in which ink is ejected from the nozzle 25 while the recording head 3 moves from the other side in the main scanning direction toward one home position. It is a schematic diagram explaining the mode of a printing process. When the forward printing process is completed, the paper feed motor 48 is operated to feed the recording paper 6 to the downstream side in the sub-scanning direction by a distance corresponding to the half of the nozzle row, that is, the length of one nozzle group. The printing process is performed. As shown in the drawing, in the return path, silver ink is ejected from the glossy-system-compatible nozzle group (S) disposed downstream of the second nozzle row 28b in the sub-scanning direction by the first drive pulse DP1. A silver ink layer 51 is formed by landing on a predetermined position of the recording paper 6. Thereafter, at the timing when the recording head 3 is moved by the interval between the adjacent nozzle rows, the white ink from the white-corresponding nozzle group arranged on the downstream side in the sub-scanning direction of the first nozzle row 28a by the second drive pulse DP2. Are ejected and land on the previously formed silver ink layer 51. As a result, the white ink layer 52 is formed on the silver ink layer 51 in the same manner as in the forward path. In this manner, the return path printing process is performed while silver ink and white ink are alternately and repeatedly ejected.

  In this way, by performing the printing process while alternately ejecting the silver ink and the white ink in the forward path and the backward path, the ground color of the recording medium such as the recording paper 6 is covered and concealed by the silver ink layer 51, Since the white ink layer 52 is formed on the silver ink layer 51 as a base, the glossiness of the silver ink layer 51 is obtained. Thereby, compared with the case where the white ink layer 52 is directly formed on a recording medium, the brightness of the white ink layer 52 can be raised, and as a result, white color development can be made more conspicuous. In this embodiment, since the amount of ink droplets when silver ink is ejected is set to be larger than the amount of ink droplets when white ink is ejected, the silver ink layer 51 Is larger than the coverage area of the white ink layer 52. As a result, the background color of the recording medium of the silver ink layer 51 is more reliably concealed, and the glossiness is more emphasized, so that the color development of the white ink layer 52 can be further emphasized. In particular, even if the recording medium is a resin film that transmits light, the color forming property of the ink formed thereon can be ensured by the concealing action of the silver ink layer 51 as a base. The printer 1 can efficiently perform recording in both the forward and backward directions.

  Here, in the above-described embodiment (first embodiment), the configuration in which the white color is conspicuous by forming the white ink layer 52 on the silver ink layer 51 as a base is exemplified, but the present invention is not limited thereto. On the contrary, by forming a silver ink layer on the white ink layer as a base, it is possible to make the metallic texture stand out.

  FIG. 8 is a plan view for explaining the configuration of the nozzle plate 11 ′ in the second embodiment. The difference from the first embodiment is the silver in the first nozzle row 28 a and the second nozzle row 28 b. This is a part related to the assignment of ink and white ink, and the other configurations are the same as those in the first embodiment, and thus the description thereof is omitted. In the first nozzle row 28a in this embodiment, the upstream half nozzle group in the sub-scanning direction ejects white ink (W), and the nozzle group arranged on the downstream side ejects silver ink (S). It is configured. Accordingly, the nozzle group on the upstream side of the first nozzle row 28a corresponds to a white group corresponding nozzle group, and the downstream nozzle group corresponds to a glossy group corresponding nozzle group. Similarly, in the second nozzle row 28b, the nozzle group arranged on the upstream side ejects silver ink (S), and the nozzle group arranged on the downstream side ejects white ink (W). ing. Therefore, the upstream nozzle group of the second nozzle row 28b corresponds to a glossy corresponding nozzle group, and the downstream nozzle group corresponds to a white corresponding nozzle group. And the 1st nozzle row 28a and the 2nd nozzle row 28b are arrange | positioned in the state adjacent without the other nozzle row being arrange | positioned between both.

  Next, a printing process using silver ink and white ink in the present embodiment will be described. In this printing process, white ink is first ejected onto a recording medium such as recording paper 6 and recording is performed using the white ink layer as a base, and then silver ink is ejected onto the white ink layer to overlap the silver ink layer. Form.

  FIG. 9A is a schematic diagram illustrating a printing process in the forward direction in the present embodiment. FIG. 10 is an enlarged view of a region X in FIG. As shown in FIG. 9A, in the forward path, white ink is ejected from the white group corresponding nozzle group (W) arranged on the upstream side in the sub-scanning direction of the first nozzle row 28a by the first ejection pulse DP1. Then, it lands on a predetermined position of the recording paper 6. As a result, the white ink layer 52 is first formed on the recording paper 6. Thereafter, at the timing when the recording head 3 is moved by an interval between adjacent nozzle rows, the silver ink is ejected from the glossy-corresponding nozzle group disposed upstream of the second nozzle row 28b in the sub-scanning direction by the second drive pulse DP2. Are ejected and land on the previously formed white ink layer 52. Thereby, as shown in FIG. 10, the silver ink layer 51 is formed on the white ink layer 52 so as to overlap. In this way, the forward printing process is performed while white ink and silver ink are alternately and repeatedly ejected from the recording head 3.

  FIG. 9B is a schematic diagram illustrating a printing process in the backward direction in the present embodiment. When the forward printing process is completed, the paper feed motor 48 is operated to feed the recording paper 6 to the downstream side in the sub-scanning direction by a distance corresponding to the half of the nozzle row, that is, the length of one nozzle group. The printing process is performed. As shown in the figure, in the return path, white ink is ejected from the white-corresponding nozzle group (W) disposed downstream of the second nozzle row 28b in the sub-scanning direction by the first drive pulse DP1. A white ink layer 52 is formed by landing on a predetermined position of the recording paper 6. Thereafter, at the timing when the recording head 3 is moved by the interval between the adjacent nozzle rows, the silver ink from the glossy corresponding nozzle group disposed downstream of the first nozzle row 28a in the sub-scanning direction by the second drive pulse DP2. Are ejected and land on the previously formed white ink layer 52. Thereby, the silver ink layer 51 is formed on the white ink layer 52 so as to overlap as in the case of the forward path. In this manner, the return printing process is performed while white ink and silver ink are alternately and repeatedly ejected.

  As described above, the white ink and the silver ink are alternately ejected in both the forward and backward directions to perform the printing process so that the ground color of the recording medium such as the recording paper 6 is covered with the white ink layer 52. Since the silver ink layer 51 is formed on the white ink layer 52 as a base, the brightness of the silver ink layer 51 is increased as compared with the case where the silver ink layer 51 is directly formed on the landing target. As a result, the metallic gloss of the silver ink layer 51 can be made more conspicuous. In the present embodiment, the first drive pulse DP1 and the second drive pulse are set so that the amount of ink droplets when white ink is ejected is larger than the amount of ink droplets when silver ink is ejected. Since DP2 is properly used, the coverage area of the white ink layer 52 is larger than the coverage area of the silver ink layer 51. As a result, the background color of the recording medium can be more reliably concealed by the white ink layer 52, and the glossiness is further enhanced, so that the glossiness of the silver ink layer 51 can be further emphasized. In particular, even if the recording medium is a resin film that transmits light, the color forming property of the ink formed thereon can be ensured by the concealing action of the white ink layer 52 as the base.

  The present invention is not limited to the above-described embodiment, and various modifications can be made based on the description of the scope of claims.

  In each of the above-described embodiments, the configuration in which the recording head 3 (the carriage 4 on which the recording head 3 is mounted) moves relative to the recording medium in a stationary state in the reciprocal printing process in the main scanning direction is exemplified. Is not limited. For example, it is possible to adopt a configuration in which the recording medium is moved relative to the recording head 3 in a state where the position of the recording head 3 is fixed. In the above-described embodiment, one recording head 3 corresponds to, for example, the first nozzle row 28a corresponding to the white ink (W) and the silver ink (S), the white ink (W), and the silver ink (S). The second nozzle row 28b, the third nozzle row 28c corresponding to yellow ink (Y), the fourth nozzle row 28d corresponding to magenta ink (M), and the fifth nozzle corresponding to cyan ink (C). A mode is shown in which the row 28e and the sixth nozzle row 28f corresponding to the black ink (K) are formed side by side in the direction corresponding to the main scanning direction. However, the present invention is not limited to this mode. For example, the first nozzle row 28a corresponding to the white ink (W) and the silver ink (S), and the second nozzle corresponding to the white ink (W) and the silver ink (S). A recording head provided with the row 28b and a recording head provided with nozzle rows of other colors may be provided separately. Further, a recording head provided with a first nozzle row 28a corresponding to white ink (W) and silver ink (S), and a second nozzle row 28b corresponding to white ink (W) and silver ink (S). The “recording head” and “liquid ejecting head” of the present invention are interpreted as collectively expressing a recording head (liquid ejecting head) provided with a plurality of recording heads. There is a case.

  Further, the drive signal for driving the piezoelectric vibrator 19 and the drive pulse included in the drive signal are not limited to those exemplified in the above embodiment, and those having an arbitrary configuration can be adopted. In short, it is only necessary that the amount of ink forming the base is larger than the amount of ink landed on the base.

  Further, in the above embodiment, the first nozzle row 28a and the second nozzle row 28b are provided with the nozzle for white ink and the nozzle for silver ink divided in half, respectively. For example, depending on the print data, more white ink nozzles are provided in the first nozzle row 28a than in the silver ink nozzles, and the white ink nozzles in the second nozzle row 28b are provided. In consideration of the number of silver ink nozzles in the first nozzle row 28a, nozzles may be provided so as to relatively reduce the number of silver ink nozzles in the second nozzle row 28b.

  In addition, although the example which applied this invention to the inkjet recording printer was demonstrated above, it is not limited to this. The present invention can be applied to formation of electrodes such as a color material ejecting apparatus, an organic EL display, and an FED, which are used for manufacturing a color filter such as a liquid crystal display, as long as two types of liquid are deposited on the landing target. The present invention can also be applied to other liquid ejecting apparatuses such as an electrode material ejecting apparatus to be used and a bio-organic matter ejecting apparatus used for manufacturing a biochip.

  DESCRIPTION OF SYMBOLS 1 ... Printer, 2 ... Cartridge mounting part, 3 ... Recording head, 6 ... Recording paper, 10 ... Pulse motor, 11 ... Nozzle plate, 15 ... Vibrator unit, 16 ... Case, 17 ... Flow path unit, 19 ... Piezoelectric vibration Child, 24 ... pressure chamber, 25 ... nozzle, 28 ... nozzle row, 44 ... printer controller, 45 ... print engine, 46 ... control unit, 47 ... drive signal generation circuit, 48 ... paper feed motor, 51 ... silver ink layer, 52 ... White ink layer

Claims (6)

A nozzle array having a plurality of nozzles is provided, and pressure fluctuation is generated in the liquid in the pressure chamber by driving the pressure generating means, and the liquid is ejected from the nozzle by using the pressure fluctuation to land the liquid. A liquid ejecting head for landing on an object;
A liquid ejecting apparatus that ejects at least a white liquid and a glossy liquid from the liquid ejecting head while relatively moving the liquid ejecting head and the landing target in a direction intersecting the nozzle row, and causes the liquid to land on the landing target. There,
The first nozzle row includes a white-corresponding nozzle group that ejects a white-based liquid and a gloss-corresponding nozzle group that ejects a gloss-based liquid, and the first relative movement direction of the liquid ejecting head with respect to the landing target Placed on the other side of
The second nozzle row has a white group corresponding nozzle group and a glossy group corresponding nozzle group, and is disposed on the rear side in the first relative movement direction in the liquid jet head,
In the movement in the first relative movement direction, after the glossy liquid is ejected from the glossy corresponding nozzle group of the first nozzle row, the white liquid is jetted from the white corresponding nozzle group of the second nozzle row. ,
In the movement in the second relative movement direction opposite to the first relative movement direction, after the glossy liquid is ejected from the glossy corresponding nozzle group of the second nozzle row, the white color of the first nozzle row A liquid ejecting apparatus that ejects white liquid from a system-compatible nozzle group. In the first nozzle row, when the landing target is transported in a direction crossing the relative movement direction, a glossy-corresponding nozzle group is disposed on the upstream side in the transport direction, and a white system is disposed on the downstream side in the same direction. Corresponding nozzle group is arranged,
The white nozzle group is arranged upstream of the landing direction in the transport direction of the landing target, and the glossy nozzle group is arranged downstream of the second nozzle row in the same direction. The liquid ejecting apparatus according to 1.   The liquid ejecting apparatus according to claim 1, wherein the first nozzle row and the second nozzle row are adjacent to each other without any other nozzle row being disposed therebetween. . A nozzle array having a plurality of nozzles is provided, and pressure fluctuation is generated in the liquid in the pressure chamber by driving the pressure generating means, and the liquid is ejected from the nozzle by using the pressure fluctuation to land the liquid. A liquid ejecting head for landing on an object;
A liquid ejecting apparatus that ejects at least a white liquid and a glossy liquid from the liquid ejecting head while relatively moving the liquid ejecting head and the landing target in a direction intersecting the nozzle row, and causes the liquid to land on the landing target. There,
The first nozzle row includes a white-corresponding nozzle group that ejects a white-based liquid and a gloss-corresponding nozzle group that ejects a gloss-based liquid, and the first relative movement direction of the liquid ejecting head with respect to the landing target Placed on the other side of
The second nozzle row has a white group corresponding nozzle group and a glossy group corresponding nozzle group, and is disposed on the rear side in the first relative movement direction in the liquid jet head,
In the movement in the first relative movement direction, after the white liquid is ejected from the white corresponding nozzle group of the first nozzle row, the gloss liquid is ejected from the gloss corresponding nozzle group of the second nozzle row. ,
In the movement in the second relative movement direction opposite to the first relative movement direction, after the white liquid is ejected from the white corresponding nozzle group of the second nozzle row, the gloss of the first nozzle row A liquid ejecting apparatus for ejecting a glossy liquid from a system-compatible nozzle group. In the first nozzle row, when the landing target is transported in a direction crossing the relative movement direction, a white-corresponding nozzle group is disposed on the upstream side in the transport direction, and a glossy system is disposed on the downstream side in the same direction. Corresponding nozzle group is arranged,
The glossy corresponding nozzle group is disposed upstream of the landing direction in the transport direction of the landing target, and the white corresponding nozzle group is disposed downstream of the second nozzle row in the same direction. The liquid ejecting apparatus according to 1.   6. The liquid ejecting apparatus according to claim 4, wherein the first nozzle row and the second nozzle row are adjacent to each other without any other nozzle row being disposed therebetween. .

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