JP2015150708A - Inkjet three-dimensional object modeling method, program, and inkjet three-dimensional object modeling system - Google Patents

Abstract

A surface state of a three-dimensional object using a photocurable ink can be adjusted to an arbitrary state without increasing a leveling time.
In a method of modeling a three-dimensional object using an ink jet recording apparatus using photocurable ink, the first photocurable ink used for modeling the three-dimensional object and the viscosity upon landing are the first. A three-dimensional object formed with the first photocurable ink on a recording table based on the surface information of the original data of the three-dimensional object using the second photocurable ink having a lower viscosity than the photocurable ink of The surface state of the three-dimensional object is adjusted by ejecting a predetermined amount of the second photo-curable ink onto the surface.
[Selection] Figure 3

Description

  The present invention relates to an inkjet three-dimensional object modeling method, a program, and an inkjet three-dimensional object modeling system.

As a three-dimensional object modeling method that does not use a mold, additive manufacturing is gaining attention.
In additive manufacturing, various technologies have been developed for the 3D printing method, in which the material is printed and stacked at the required location, not the cutting method that cuts out the shaped object from the lump of material. Yes.
(1) As a typical method, there is a “thermal melting method (PJP)” method in which a thermoplastic resin such as ABS resin is melted, drawn from a nozzle, and then stacked up like a single stroke.
ABS is an abbreviation for Acrylonitrile Butadien Styrene. PJP is an abbreviation for Plastic Jet Printing.
(2) In addition, the acrylic resin is thinly laid on a transparent film, cured by applying ultraviolet rays with a mask applied from below, the cured product is pulled up, and the lower layer is formed in sequence to form a film transfer image. Law (FTI) "method. FTI is an abbreviation for Film Transfer Image.

On the other hand, there are two methods using the ink jet recording method.
(3) One is a method in which water is formed as a flocculant solution on a layer of plaster and the part in which the water has penetrated is solidified.
(4) The other one is a method of using a resin as a photo-curing type ink, ejecting it onto the formation surface, then curing it with ultraviolet rays, and successively laminating it.

  Both have advantages and disadvantages in terms of device / material cost, fine processing accuracy, and strength of the modeled object, and are used properly depending on the application.

  However, as a great merit of the modeling method using the ink jet among these, modeling and coloring can be performed simultaneously. In the first two methods (1) and (2), it is necessary to collectively set the amount of resin for each stack, so if you want to express more than two colors, you need to change the color each time. It must be totally replaced with a different amount of material. Considering the cost and labor involved in changing the amount of material, including cleaning, it is not realistic to perform “modeling and coloring simultaneously” in the first two methods (1) and (2).

On the other hand, when discharging a flocculant and photocurable ink using an inkjet, it can shape | mold while coloring, by coloring the flocculant liquid and photocurable ink itself.
The former is a technique reported in, for example, Patent Document 1. In the latter case, full-color printing using UV (Ultra Violet) curable ink is already established as a commercial technique in the offset printing field and the sign graphic field.

Further, the two methods using the ink jet have advantages and disadvantages, both of which are properly used depending on the application, but the latter method using the photocurable ink is excellent in the vividness of color development.
For example, in the technique reported in Patent Document 1 and the like, the powder as the amount of material is gradually dyed by the coloring liquid soaked in the powder, so that the coloring efficiency is weakened. In order to achieve vivid color development, it is necessary to discharge a large amount of the colored flocculant liquid. When a highly colored flocculant liquid is used, the flocculant liquid adheres too much when trying to express a light color. It can not be made.

  On the other hand, when colored photocurable ink is used, for example, as disclosed in Patent Document 2, a white background layer is formed as a base with photocurable ink colored in white, and colored on the layer Recording with used ink, that is, CMYK or the like. Thereby, it is possible to express the light and dark full color by the principle of density of the colored dots which is the same as the gradation expression in flat printing. In this method, since the colorant remains on the outermost surface of the modeled object, the color becomes brighter than the former in which the colorant penetrates into the material amount.

When performing three-dimensional modeling, there is a demand for finishing the surface at the same time as modeling. The term “finish” as used herein refers to a microscopic surface state of a modeled object, that is, a surface state such as “smooth” or “rough”.
Examples of the post-process include physical polishing and flattening by dissolution / melting with a solvent or heat treatment. Alternatively, although processing such as sandblasting or roughening by embossing is possible, it is difficult to apply to a complicated structural surface, and there is a problem that a colored layer formed simultaneously with modeling may be damaged. That is, if the coloring is performed after the surface treatment, it cannot be done at the same time as modeling.

In the three-dimensional modeling method using an ink jet, “modeling + coloring + planar shaping” can be performed at the same time, but there remains a problem with a method using an aggregating agent or a method using a photocurable ink.
In the method using an aggregating agent, if a large amount of the aggregating agent liquid is adhered to be flattened, the permeation surface is expanded, and as a result, fine processing becomes difficult. In addition, if an attempt is made to express a rough surface with a reduced amount of adhesion, the color development itself becomes weak. Since the amount of the flocculant affects the surface shape, color development, and processing accuracy, it is very difficult to manage / control each of them with high accuracy.

Although a method can be considered by preparing a plurality of flocculants having different discharge amounts and coloring amounts, problems such as complicated mechanism / control and increased costs remain.
In the method using the photocurable ink, the surface state can be adjusted by performing leveling. The term “leveling” as used herein refers to a state in which the photocurable ink droplets that have landed on the forming surface gradually level the surface as the ink spreads and gravity.
In other words, if UV curing is performed immediately after landing, the ink droplet shape immediately after landing, that is, the hemispherical shape is cured, so that it is possible to create a “rough” surface state and leveling in a sufficient amount of time. For example, a “smooth” surface with a smooth surface can be obtained.

  However, depending on the motif to be modeled, the surface state varies widely, and there are cases where a plurality of surface shapes must be expressed in the same modeled object. If UV rays hit even a little, they will be cured even during leveling. Therefore, when multiple surface shapes are included, the operation of “leveling → curing” must be performed for each state. In a three-dimensional modeling method that takes several hours to several tens of hours even if only normal modeling is performed, it is not preferable from the viewpoint of productivity to spend more time for leveling.

  Accordingly, an object of the present invention is to adjust the surface state of a three-dimensional object using photocurable ink to an arbitrary state without increasing the leveling time.

  In order to solve the above-mentioned problem, the invention according to claim 1 is the first light used for modeling a three-dimensional object in a method of modeling a three-dimensional object using an ink jet recording apparatus using photocurable ink. Using a curable ink and a second photocurable ink having a lower viscosity than that of the first photocurable ink on landing, based on the surface information of the original data of the three-dimensional object, Further, the surface state of the three-dimensional object is adjusted by discharging a predetermined amount of the second photocurable ink onto the surface of the three-dimensional object formed with the first photocurable ink.

  According to the present invention, the surface state of a three-dimensional object using photocurable ink can be adjusted to an arbitrary state without increasing the leveling time.

It is a block diagram which shows the whole structure of one Embodiment. It is explanatory drawing of the carriage used for the inkjet three-dimensional object modeling system 1 shown in FIG. It is an example of the flowchart for demonstrating operation | movement of the inkjet three-dimensional object modeling system shown in FIG. It is a figure which shows a mode that the unevenness | corrugation of the 1st photocurable ink after hardening is filled up with a 2nd photocurable ink. It is a figure which shows the temperature characteristic of commercially available UV ink viscosity. It is a figure which shows the behavior image after the landing of a 2nd photocurable ink. FIG. 4 is a diagram illustrating a relationship between a driving position of the first photocurable ink 2 and a driving position of the second photocurable ink 3. It is the figure which illustrated the division point in modeling former data, and the 1st photocurable ink placement position. It is a figure which shows the relationship between modeling resolution and Z value. It is an image figure of height adjustment for every B group individual position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Overview>
The present invention includes performing three-dimensional modeling using a first photocurable ink that performs modeling and coloring, and a second photocurable ink for adjusting the surface shape. Note that the first and second classifications described here are characteristic classifications, and do not mean that two inks are used.

<Configuration>
FIG. 1 is a block diagram showing the overall configuration of an embodiment. FIG. 2 is an explanatory diagram of a carriage used in the inkjet three-dimensional object modeling system 1 shown in FIG.
An inkjet three-dimensional object modeling system 1 shown in FIG. 1 has a host computer 10 and a printer 20. The host computer 10 has a printer driver 11 for operating the printer 20. The printer 20 includes a control unit 20a, a head unit 20b, and a head traveling unit 20c. The control unit 20a includes a host I / F 21, a CPU 22, a ROM 23, a RAM 24, an NVRAM 25, an operation panel 26, an ASIC 27, an I / O 28, and an environment sensor 29. The head unit 20b includes a drive waveform generation unit 30, a head driver 31, a light source power source 32, and a carriage 33. The carriage 33 has a recording head 33a and a UV lamp 33b. The head traveling unit 20c includes a main scanning motor driving unit 34, a main scanning motor 35, a sub scanning motor driving unit 36, a sub scanning motor 37, and a recording table 38.

  CPU is an abbreviation for Central Processing Unit, and I / F is an abbreviation for Inter Face. ROM is an abbreviation for Read Only Memory, and RAM is an abbreviation for Random Access Memory. ASIC is an abbreviation for Application Specific Integrated Circuit. NVRAM is Non-Volatile Random Access Memory.

The host computer 10 controls the operation of the printer 20 by the printer driver 11.
The host I / F 21 has a function of connecting the host computer 10 and the printer 20.
The CPU 22 has a function for overall control of the printer 20.
The ROM 23 has a function for overall control of the operation of the printer 20.
The RAM 24 has a function of temporarily storing data.
The NVRAM 25 is also called a nonvolatile ram, and stored data is not lost even when the power is turned off. Has a backup function.
The operation panel 26 includes a power switch, a numeric keypad, a start key, and a display element.
The ASIC 27 is an application-specific integrated circuit and has a function for operating the inkjet three-dimensional object modeling system.
The I / O 28 has a function of bridging a signal between the environmental sensor 29 and the control unit 20a.
The environment sensor 29 has a function of detecting an environment such as temperature and humidity.

The drive waveform generation unit 30 has a function of generating a signal for driving the recording head 33a.
The head driver 31 has a function of driving the recording head 33a by a signal from the drive waveform generation unit 30.
The recording head 33a has a function of emitting photocurable ink to the recording table 38 in response to a signal from the head driver 31.
The light source power source 32 is a power source for lighting the UV lamp 33b.

The carriage 33 shown in FIG. 2 is for reciprocating the recording head 33a and the UV lamp 33b in the main scanning direction, and UV lamps 33ba and 33bb are provided on both sides of the plurality of recording heads 33a arranged in a line in the main scanning direction. Is arranged. The UV lamp 33ba is, for example, an activation energy irradiation light source for the forward path that is turned on when moving to the right side of FIG. 2, and the UV lamp 33bb is an activation energy for the return path that is turned on when moving to the left side of FIG. Irradiation light source.
The main scanning motor driving unit 34 has a function for driving the main scanning motor 35 to rotate. The sub-scanning motor drive unit 36 has a function for driving the sub-scanning motor 37 to rotate.
The recording table 38 is a table for forming a three-dimensional object thereon.
Although the drawing shows the case where the recording table 38 moves in the sub-scanning direction, the present invention is not limited to this, and the carriage 33 is configured to move in the main scanning direction or the sub-scanning direction. May be.

<Ink viscosity>
The first photocurable ink (hereinafter referred to as the first ink) is preferably a high-viscosity ink within a range that can be ejected by an inkjet head in order to perform modeling efficiently. The viscosity of the inkjet UV ink that is generally used is about 13 to 25 mPa · s at room temperature, and the viscosity of the first ink is preferably within this numerical range.
It is preferable to use an achromatic color ink or a chromatic color ink as the first ink, and a transparent achromatic color ink as the second photocurable ink (hereinafter referred to as the second ink). If an ink jet head having a stronger ejection force is developed, the viscosity may be higher.

  Here, higher viscosity is better because if the viscosity is low and wet spreadability is good, the height of the shaped object that can be formed by adhesion per drop does not become the required height, and as a result hundreds of This is because thousands of stacking operations are required and productivity is lowered. That is, if the magnification is too large, the resolving power also decreases.

Further, in order to perform full-color coloring, the first ink for a total of five colors of at least four colors of CMYK and white (W) as the background is required. The number of colors may be smaller or larger than these five colors depending on the color quality of the three-dimensional object. For mono-color and two-tone colors, the color becomes one or two colors. For higher quality, light-color ink or special color ink may be added.
In addition to the coloring, the first ink may be provided only for forming the base of the three-dimensional object. The first ink may be any color, and the cost is reduced accordingly.

  Basically, there is only one kind of the second ink. The characteristic required for the second ink is first to be “transparent”. This is an essential characteristic so as not to impair the color development of the surface colored with the first ink.

  The high-viscosity photocurable ink and the transparent and low-viscosity photocurable ink correspond to, for example, UV ink for printing. Various color inks such as C / M / Y / K, special colors (R / G / B), photo (Ic / Im / gray), and clear (transparent) have already been put to practical use for printing. Moreover, as shown in FIG. 5, a viscosity changes also with the difference of each company prescription, and it is possible to adjust a viscosity also by heating. FIG. 5 is a graph showing temperature characteristics of commercially available UV ink viscosity. In FIG. 5, the shaded portion is the maximum value at each temperature. From FIG. 5, it can be seen that the photocurable ink of Company A has a high viscosity at 25 ° C., and the viscosity of the photocurable ink of Company B is high at 30 ° C. or higher.

Next, it is necessary that the viscosity of the second ink is lower than that of the first ink.
<Three-dimensional object with ink>
FIG. 4 is a diagram illustrating a state in which the unevenness of the first ink after curing is filled with the second ink. That is, FIG. 4A is a cross-sectional view of an uneven surface formed by a three-dimensional object made of the first ink 2 on the substrate made of the first ink 2. FIG. 4B is a cross-sectional view of a mat surface formed by allowing the second ink 3 to penetrate a three-dimensional object made of the second ink 2 onto the substrate made of the first ink 2. FIG. 4C is a cross-sectional view of a smooth surface formed by allowing the second ink 3 to penetrate a three-dimensional object made of the second ink 2 on the substrate made of the first ink 2.

  As shown in FIGS. 4A to 4C, the second ink 3 is infiltrated into the uneven space on the surface of the three-dimensional object formed with the first ink 2 to adjust the height of the uneven surface. This is because the second ink 3 needs to quickly spread out in order to eliminate the difference. In this case, the lower the viscosity, the better and the leveling time is shortened. Considering the production efficiency, it is desirable that it should be at least half that of the first ink 2.

Further, as a method for lowering the viscosity of the second ink 3, the prescription / component may not be changed, but the second ink 3 may be ejected at a temperature higher than that of the first ink 2. The characteristic of the liquid is that the viscosity changes with temperature. Even with a general UV ink, the viscosity can be reduced to half or less by simply raising it by 20 ° C from room temperature (25 ° C) (see Fig. 5).
Since the surface of the three-dimensional object into which the second ink is applied has already been photocured, there is no influence even if a liquid having a high temperature adheres.

<Ink behavior>
FIG. 6 is a diagram illustrating a behavior image after landing of the second ink.
That is, FIG. 6A shows a state before the second ink 3 is driven into the convex portion of the three-dimensional object 2 made of the first ink 2 formed on the substrate made of the first ink 2. FIG. 6B is a diagram illustrating a state after the second ink 3 of FIG. 6A is ejected. FIG. 6C shows a state before the second ink 3 is driven into the concave portion of the three-dimensional object made of the first ink 2 formed on the substrate made of the first ink 2. FIG. FIG. 6D is a diagram illustrating a state after the second ink 3 in FIG.

  Since the second ink 3 has a low viscosity, it inevitably flows from a high place to a low place (see FIGS. 6A and 6B), but the three-dimensional formed by the first ink from the beginning. The leveling time can be further shortened by directly driving the gap between the concaves and convexes that are objects (FIGS. 6C and 6D). Specifically, as shown in FIGS. 6A to 6D, the coordinates at which the first ink 2 is applied are the unevenness efficiently by applying the second ink 3 to the coordinates that are shifted by half the vertical and horizontal pitches. It is possible to fill the gap.

By adjusting the adhesion amount of the second ink 3, it is possible to adjust the surface state of the three-dimensional object in stages. Each stage of FIGS. 4A to 4C shows this, and if the second ink 3 is not attached, the rough surface is formed, and if the half of the unevenness of the first ink 2 constituting the surface is filled, the mat is formed. If the surface is filled up to the same height as the unevenness, adjustment such as making it a smooth surface becomes possible.
The adjustment amount can be calculated from the Z-axis (stacking direction) data of the modeling source data and the resolution of the ink jet recording apparatus.

<Position of first ink and second ink>
FIG. 8 is a diagram illustrating division points in the modeling source data and the first ink placement position. FIG. 9 is a diagram illustrating the relationship between the modeling resolution and the Z value.
The dividing points are called point clouds in the figure. The point group is composed of a density twice the modeling resolution, that is, a first ink placement position “Group A” and a coordinate position “Group B” as the second ink placement position, and the X, Y, and Z axes, respectively. It has direction coordinate information. Among these, by comparing the Z-axis information of the B group with the Z value of the peripheral A point group and the modeling resolution pitch W (see FIG. 9), the presence / absence and level of the unevenness are confirmed.

As an example, a case where the surface state of three stages (unevenness → matte → smooth: see FIGS. 4A to 4C) is shown is shown.
Example.
Case 1. 4 neighborhood A group Z value (average)-B group Z value <W / 8
→ It is regarded as a smooth surface, and the second ink 3 is ejected up to the A group Z value

Case 2. W / 4> 4 neighborhood A group Z value (average) −B group Z value ≧ W / 8
and
4 neighborhood A group Z value (average) ≧ W / 4
→ Considered as matte surface, ejects 2nd ink 3 to W / 8 equivalent

  Case 3. Other than Case 1 and Case 2 → regarded as an uneven surface and does not discharge the second ink 3

  In the above example, when the first ink 2 having a particularly high viscosity is used, it is assumed that the height (Z value) of the three-dimensional object that is the ink droplet after landing is close to W / 2. 8 ”and“ W / 4 ”were compared as threshold values. Naturally, as the viscosity decreases, the height Z of the ink droplet after landing also decreases, so the threshold value condition may be set as appropriate according to the height of the ink droplet and the number of divisions of the surface state.

  Further, as can be seen from FIGS. 7 and 8, the recording position of the B group can be divided by the drops of the A group by shifting the vertical and horizontal half pitches. FIG. 7 is a diagram showing the relationship between the position where the first ink 2 is applied and the position where the second ink 3 is applied.

FIG. 10 is an image diagram of height adjustment for each group B individual position.
As shown in FIG. 10, in order to prevent the second ink having a low viscosity from leaking out immediately from the gap between the group A droplets, the amount of the group A droplet is slightly increased, and the concave portion sealed with the four groups of group A droplets is used. The B group droplet position, which is a subsurface, was formed. By discharging the B group droplets with different droplet amounts to the depression, it is possible to express the roughness as the height in units of the pixel positions of the B group.

<Operation>
FIG. 3 is an example of a flowchart for explaining the operation of the inkjet three-dimensional object modeling system shown in FIG.
The subject of operation is the CPU 22 (see FIG. 1).
The surface layer of the B group attention image M is modeled (step S1).
The height of the surface layer of the group B focused image M is acquired. The height (M (xn, yn, zn)) is set to Zn (step S2).
ZAn-2, ZAn-1, ZAn + 1, and ZAn + 2, which are the heights of the pixel positions in the vicinity of the A group, are acquired (step S3).
Calculate AveZA = ((ZAn-2) + (ZAn-1) + (ZAn + 1) + ((ZAn + 1) + (ZAn + 2) / 4), which is the height of the four neighboring pixel positions around the A group (Step S4).
ΔZ = AveZA-Zn, which is the difference in height between the group A average and the pixel of interest M, is calculated (step S5).

It is determined whether or not ΔZ <(W / 8) (step S6). If ΔZ <(W / 8) (Case 1: Step S6 / Yes), the second ink is ejected (= AveZ) (Step S7).
If ΔZ <(W / 8) is not satisfied (step S6 / No), it is determined whether ΔZ <(W / 4) is satisfied (step S8). If ΔZ <(W / 4) (Case 2: Step S8 / Yes), the second ink is ejected (W / 8) (Step S9). If ΔZ <(W / 4) is not satisfied (step S8 / No), the second ink is not ejected (case 3: step S10).
After steps S7, S9, and S10 are completed, the process proceeds to step S11, and the process proceeds to the next group B focused image M + 1 (step S11).

  As described above, by performing surface formation using the second inks having different viscosities, it is possible to simultaneously perform “modeling + coloring + planar shaping” with a minimum leveling time. This modeling method can be installed in a program and executed as a 3D printer system, or can be recorded and distributed on a storage medium, or can be installed in a hardware controller such as an ASIC. ASIC is an abbreviation for Application Specific Integrated Circuit, and is an integrated circuit for specific applications.

<Program>
The inkjet three-dimensional object modeling system according to the present invention described above is realized by a program that causes a computer to execute processing. As an example, the case where the function of the present invention is realized by a program will be described below.

For example,
A computer of an inkjet three-dimensional object modeling system that ejects photocurable ink from a head of an inkjet recording apparatus to form a three-dimensional object on a recording table, irradiates light for curing from a light source, and models the three-dimensional object. Is a readable program,
On the computer,
A procedure in which the head ejects the first photocurable ink on the recording table based on the surface information of the original data of the three-dimensional object;
A procedure in which a light source irradiates light for photocuring to form a three-dimensional object having an uneven surface with the first photocurable ink;
The head of the three-dimensional object formed by shaping the second photocurable ink having a lower viscosity at the time of landing than the first ink with the first ink based on the surface information of the original data of the three-dimensional object. A procedure for ejecting a predetermined amount of the second ink on the surface;
A procedure for adjusting the surface state of the three-dimensional object by irradiating light for photocuring and curing the second ink.
A program for executing

  Such a program may be stored in a computer-readable storage medium.

<Storage medium>
Here, examples of the storage medium include computer-readable storage media such as CD-ROM, flexible disk (FD), and CD-R, semiconductor memories such as flash memory, RAM, ROM, and FeRAM, and HDD.

  CD-ROM is an abbreviation for Compact Disc Read Only Memory. Flexible disk means Flexible Disk (FD). CD-R is an abbreviation for CD Recordable. RAM is an abbreviation for Random-Access Memory. ROM is an abbreviation for Read-Only Memory. FeRAM is an abbreviation for Ferroelectric RAM and means a ferroelectric memory. HDD is an abbreviation for Hard Disc Drive.

<Effect>
From the above, low-viscosity inks are leveled, that is, flattened in a short time, so that the surface of a three-dimensional object can be adjusted from “smooth” to “rough” by adjusting the degree of embedding of the already formed unevenness. it can.

  The above-described embodiment shows an example of a preferred embodiment of the present invention, and the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention. is there. For example, based on the surface information of the original data of the three-dimensional object, the surface of the three-dimensional object is switched by switching the second ink droplet amount to be ejected on the surface of the three-dimensional object formed with the first ink in units of the minimum recording resolution. The state may be adjusted.

DESCRIPTION OF SYMBOLS 1 Inkjet three-dimensional object modeling system 2 1st ink (1st photocurable ink)
3 Second ink (second photocurable ink)
10 Host computer 11 Printer driver 20 Printer 20a Control unit 20b Head unit 20c Head running unit 21 Host I / F
22 CPU
23 ROM
24 RAM
25 NVRAM
26 Operation Panel 27 ASIC
28 I / O
DESCRIPTION OF SYMBOLS 29 Environment sensor 30 Drive waveform generation part 31 Head driver 32 Light source power supply 33 Carriage 33a Recording head 33b UV lamp 34 Main scanning motor drive part 35 Main scanning motor 36 Sub scanning motor drive part 37 Sub scanning motor 38 Recording stand

JP 2009-274259 A JP 2008-221835 A

Claims (7)

In a method of modeling a three-dimensional object using an ink jet recording apparatus using photocurable ink,
Using a first photocurable ink used for modeling a three-dimensional object, and a second photocurable ink having a lower viscosity than the first photocurable ink at the time of landing,
Based on the surface information of the original data of the three-dimensional object, by ejecting a predetermined amount of the second photocurable ink onto the surface of the three-dimensional object formed with the first photocurable ink on the recording table, An inkjet three-dimensional object shaping method, characterized by adjusting a surface state of the three-dimensional object.   Based on the surface information of the original data of the three-dimensional object, the second photocurable ink droplet amount ejected on the surface of the three-dimensional object formed with the first photocurable ink is switched in units of minimum recording resolution. The inkjet three-dimensional object shaping method according to claim 1, wherein the surface state of the three-dimensional object is adjusted.   2. The achromatic color ink or chromatic color ink is used for the first photocurable ink, and a transparent achromatic color ink is used for the second photocurable ink. Or the inkjet three-dimensional object modeling method of 2.   An ink jet three-dimensional object modeling method, wherein the second photocurable ink uses an ink having a viscosity at the time of landing of at least half that of the first photocurable ink.   The coordinate position at which the second photocurable ink droplet is ejected is shifted from the coordinate position at which the first photocurable ink droplet is ejected by a half pitch in both the vertical and horizontal directions. The inkjet three-dimensional object modeling method according to any one of claims 1 to 4. A computer of an inkjet three-dimensional object modeling system that ejects photocurable ink from a head of an inkjet recording apparatus to form a three-dimensional object on a recording table, irradiates light for curing from a light source, and models the three-dimensional object. Is a readable program,
In the computer,
A procedure in which the head ejects a first photocurable ink onto the recording table based on surface information of original data of a three-dimensional object;
A procedure in which the light source irradiates light for photocuring to form a three-dimensional object having an uneven surface with the first photocurable ink;
Based on the surface information of the original data of the three-dimensional object, the first photo-curing ink has a second photo-curing ink whose viscosity upon landing is lower than that of the first photo-curing ink. A procedure for ejecting a predetermined amount of the second photocurable ink onto the surface of a three-dimensional object formed with mold ink;
A procedure for adjusting the surface state of the three-dimensional object by irradiating light for photocuring and curing the second photocurable ink by the light source;
A program for running This is an inkjet three-dimensional object modeling system in which a photocurable ink is ejected from a head of an inkjet recording apparatus to form a three-dimensional object on a recording table, and light for curing is irradiated from a light source to model the three-dimensional object. And
The head includes a first photocurable ink used for modeling a three-dimensional object, and a second photocurable ink having a viscosity at landing that is lower than that of the first photocurable ink. Based on the surface information of the original data of the three-dimensional object, a predetermined amount of the second photocurable ink is ejected onto the surface of the three-dimensional object modeled with the first photocurable ink. An inkjet three-dimensional object shaping system characterized by adjusting a surface state.

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