JPH02113925A - Formation of stereoscopic image - Google Patents

Abstract

PURPOSE:To obtain a stereoscopic image having a smooth surface by making a warpage direction due to shrink action generated when a light-setting molten resin is cured not constant by differentiating the line direction of the raster scanning of a beam spot at each time when the formation of a cured layer is finished. CONSTITUTION:When the raster scanning of exposure beam to the liquid surface 4a of a light-setting molten resin 4 is finished with respect to one resolving surface, the exposure beam 18 cures the region subjected to raster scanning and one cured layer having the same shape as a resolving plane to be formed at first is formed. For example, one cured layer is formed by setting the first scanning direction to the line scanning direction of the exposure beam 18. When one cured layer is formed, an elevator 5 is moved downwardly by one layer pitch. By this method, the light-setting molten resin 14 flows in on the already formed cured layer in the thickness corresponding to one layer pitch. Next, the raster scanning of the exposure beam 18 is performed with respect to the second resolving plane. In this case, the line scanning direction of exposure beam 18 is set to the second scanning direction. By this method, the cured layer corresponding to the second resolving plane is formed.

Description

[Detailed description of the invention] The three-dimensional image forming method of the present invention will be explained according to the following items.

A Industrial 111 Field 8 Summary of the invention C Prior art [Figures 5 and 6] a7 General background b Method of forming a three-dimensional image by exposure [Figures 5 and 6] 06 Invention or attempt to solve Problems [Figs. 6 and 7] E1 Means for solving problems F, Example [Figs. 1 to 4] a. Three-dimensional image forming device [Figs. 1 to 3] a-13 Work part [Figs. 1 and 2] a-2 beam scanning part [Figs. 1 to 3] a-3 control part [Figs. 1 to 3] b. Three-dimensional image forming method G Effects of the invention ( A. Industrial Application Field) The present invention relates to a novel three-dimensional image forming method. Specifically, a method for forming a three-dimensional image in which a three-dimensional image is formed based on an arbitrary design by exposing and scanning a photocurable molten resin with a beam spot of a predetermined exposure beam, and in particular, a three-dimensional image forming method in which a three-dimensional image is formed based on an arbitrarily designed one by scanning a photocurable molten resin with a beam spot of a predetermined exposure beam, and in particular, the beam spot is scanned in a raster manner. This invention relates to a three-dimensional image forming method in which a sheet-like hardened layer having a predetermined external shape is formed, and a three-dimensional image is formed by sequentially stacking such hardened layers. The purpose of this project is to provide a new method for forming a three-dimensional image that eliminates or suppresses the distortion that occurs in the three-dimensional image that is formed, and that also makes it possible to obtain a three-dimensional image with a smooth surface. be.

(B. Summary of the Invention) The three-dimensional image forming method of the present invention is a three-dimensional image forming method in which a three-dimensional image is formed based on an arbitrarily designed image by exposing and scanning a photocurable molten resin with a beam spot of a predetermined exposure beam. A method, in particular, a three-dimensional image forming method in which a sheet-like hardened layer having a predetermined external shape is formed by scanning the beam spot in a rask, and a three-dimensional image is formed by sequentially laminating such hardened layers. A method,
By changing the line direction of the rask scan of the beam spot each time the formation of one or more hardened layers is completed,
To eliminate the constant direction of warping due to shrinkage when a photocurable molten resin hardens, thereby eliminating or suppressing distortion occurring in a three-dimensional image formed, and obtaining a three-dimensional image with a smooth surface. It was made so that it could be done.

(C Prior Art) [Figures 5 and 6] (a-Numerical Background) Today, various articles are formed from synthetic resins, and their formation is usually performed by molding.

By the way, in order to form an article using synthetic resin Δ1, first, the article is designed, then a molding die is designed, a molding die 14'J is manufactured according to the design, and the manufactured metal mold is Many processes are required, such as molding using molds, and generally prototypes and design changes are made many times before the final shape of the product is determined. Each time a design change is made, the mold for molding must be modified or remanufactured from scratch.

For this reason, the manufacturing cost of synthetic resin products is extremely high, so it is not economically worth it unless it is produced in large quantities, and it takes a lot of effort and a long time to reach the final production stage. A rag that is covered with water.

There is.

(b Method for forming a three-dimensional image by exposure) [Figures 5 and 6] In recent years, in contrast to such synthesis 1Δ (formation using a mold for molding fat articles), photocurable molten resin is exposed to a predetermined exposure beam. A method of forming an article of a desired shape by exposing the material to light has been proposed, and such a forming method is described, for example, in Japanese Patent Laid-Open Publication No. 62-35966.

FIGS. 5 and 6 show an example of a three-dimensional image forming apparatus a for carrying out the above-described forming method.

In the figure, b is a resin storage tank in which a photocurable molten resin C that is cured by irradiation with a predetermined exposure beam, for example, ultraviolet light, and d is a horizontal plate-shaped stage e, which is not shown in the figure. An elevator (f), which is moved vertically by a non-transfer means, is placed above the resin storage tank, and an elevator (f) is placed above the resin storage tank, and the exposure beam (g) is condensed onto the surface of the photocurable molten 1Δ1 resin (C). The system scanner i is a modeling controller that controls the operations of the two-frame scanner f and the elevator d. Shape data obtained by decomposing the image j in the three-dimensional direction, that is, decomposed pitch data obtained by decomposing the three-dimensional image J into a large number of planes in the - direction (hereinafter, this data is referred to as "hierarchical pitch data", and the above-mentioned The direction of decomposition is referred to as the "Z direction J" and the many planes mentioned above (hereinafter referred to as "decomposition planes").

) are decomposed in two directions perpendicular to each other (hereinafter, this data is referred to as "plane data", and one of the two decomposition directions is referred to as the "X direction J" and the other as the "Y direction").
Say. ) is input, the downward movement of the elevator d is performed at a pitch according to the layer pitch data, and the beam scanner f performs line scanning in the Y direction according to the line data in the X direction. Rask scanning is controlled so that the line position is changed depending on the data.

Then, when the formation of the three-dimensional image starts, the elevator d
As shown by the solid line in the figure, the top surface of the stage e is at a position one layer pitch below the liquid level of the photocurable molten resin C (hereinafter referred to as the "initial position"). From this state, the beam scanner f scans the exposure beam g on one decomposition plane, thereby hardening the photocurable molten resin C on the upper surface of the stage e into a shape according to the plane data. That is, a sheet-like cured layer having an outer shape corresponding to one plane data is formed. Also, the elevator d is thus stepped downwardly into one hardened layer after the formation of is completed;
Thereby.

1 of the photocurable molten resin C is placed on the already formed cured layer.
It is positioned so that it flows into the layer pitch, and from this state, 2 is formed on the next hardened layer according to the next planar data, and at this time, 2 is formed on the hardened layer in question, and 2 is formed on the previous hardened layer. 1 and adhesively bonded.

New hardened layers k are sequentially laminated on the upper surface of the already formed hardened layers, and a desired three-dimensional image is formed by kl on the many laminated hardened layers. ρ
or formed.

According to such a three-dimensional image forming method, a three-dimensional image can be formed based on an arbitrarily designed three-dimensional image j without using a mold. Therefore, it is possible to immediately create a prototype of the 3D image ρ, and also to change the design of the 3D image ρ based on the results of the examination of the 3D image ρ, and to create a 3D image based on the 3D image j after the design change. A can also be immediately prototyped, and therefore development work from design to production stage can be carried out quickly and at low cost.

(D Problem to be Solved by the Invention) [Figures 6 and 7] However, in the conventional three-dimensional image forming method of this type, the surface of the formed three-dimensional image λ perpendicular to the line direction of the rask scan is smooth. Furthermore, depending on the shape of the three-dimensional statue, distortion may occur, resulting in a problem of poor dimensional accuracy of each part.

That is, since the photocurable molten resin C generally has the property of shrinking when exposed to light and curing, if the next cured [k] is formed on the upper surface of the already formed cured layer, the cured layer The shrinkage of the previous hardened layer k causes warping, and this warping is superimposed to cause distortion in the final three-dimensional image l.

Rusk scanning of the photocurable molten resin C is carried out in units of line-shaped exposure, and in the above-mentioned conventional three-dimensional image forming method, the exposure beam for performing line-shaped exposure in Rusk scanning is Since the direction of line scanning is always constant in each layer, the designed 3D image has a shape in which a part n thereof protrudes like an eave, as in the 3D image m shown in FIG. 7, for example. If so, this protruding portion n will be warped as shown by the two-dot chain line in the figure.

In addition, since the line direction of the rask scan is always constant in each layer, only the side surface where the starting points or end points of each line scan are concentrated, that is, the side surface perpendicular to the line direction of the formed 3D image 1 is smooth. There is a problem of lack of quality.

(E Means for Solving the Problems) Therefore, in order to solve the above problems, the three-dimensional image forming method of the present invention scans the surface of a molten photocurable resin in a first direction with a light spot to form a predetermined thickness. After that, a molten photocurable resin layer of a predetermined thickness is positioned on the first cured layer, and a light spot crosses the molten photocurable resin layer with the first scanning direction. A three-dimensional image is formed by scanning in a second direction to stack a second cured layer on top of the first cured layer.

Therefore, according to the three-dimensional image forming method of the present invention, the direction of contraction of the photocurable molten resin that is cured in a line by the rask scanning of the exposure beam is different for each one or a plurality of cured layers.
The direction of the warp of the cured layer becomes undefined, which makes it possible to eliminate or suppress the distortion that occurs in the formed 3D image, making it possible to form a 3D image with high dimensional accuracy. The starting point or end point does not appear only on the - side of the stereoscopic image, and the surface of the stereoscopic image can be made smooth.

(F Example) [Figures 1 to 4] The details of the three-dimensional image forming method of the present invention will be explained below.

First, an example of a three-dimensional image forming apparatus for carrying out the three-dimensional image forming method of the present invention will be explained, and then a three-dimensional image forming method using the above three-dimensional image forming apparatus will be explained.

(a. Three-dimensional image forming apparatus) [Figures 1 to 3] 1 is a three-dimensional image forming apparatus, which includes a working section that includes a resin storage tank storing photocurable molten resin, an elevator, etc., and a photocuring unit that uses an exposure beam to It consists of a beam scanning section that scans the liquid surface of the molten resin, and a control section that controls the movement of these working sections and the beam scanning section.

(a-1, working section) [Figures 1 and 2] 2 is the working section.

3 is a resin storage tank, inside which a photocurable molten resin 4 is stored.
is stored.

This photocurable molten resin 4 is in a liquid state that hardens when irradiated with a predetermined exposure beam, and has adhesive properties that allow it to adhere to the surface of an already hardened portion when it hardens. It is necessary and desirable that the viscosity be as low as possible. Note that as the photocurable molten resin 4 having such characteristics, for example, there is an ultraviolet light-curable modified acrylate.

Reference numeral 5 designates an elevator, which has a horizontal plate-shaped stage 6 located at its lower end, and a nut 8 at its upper end 7.
is fixed, and the nut 8 connects to the stepping motor 9.
As the feed screw 10 rotates, the nut 8 is moved in the axial direction along the feed screw 10, thereby moving the elevator 5 in the vertical direction.

Incidentally, in such an elevator 5, the stage 6 is the resin storage 4! Photocurable molten resin 4 stored in i3
is positioned in the middle and is also stepped at a predetermined pitch.

(a-2, beam scanning section) [Figures 1 to 3] 11 is a beam scanning section.

12.13 is an exposure beam oscillated from a laser beam oscillator, which will be described later, with respect to the liquid surface 4a of the photocurable molten resin 4 in the left-right direction in FIG. 2 (hereinafter, this direction is referred to as the "first scanning direction"). ) and a direction perpendicular to the first scanning direction (hereinafter referred to as the "second scanning direction"). Drive part 15.15' with 14.14'
and a swinging mirror 16.1 fixed on the pivot axis 14.14'
6'.

One of these two beam scanners 12 and 13 (hereinafter referred to as the "first beam scanner").
The axial direction of the rotating shaft 14 extends in a direction parallel to the second scanning direction, and the swinging mirror 16 is located almost directly above the stage 6 of the elevator 5, and the other beam scanner 13 ( Below, "Second Beam Scanner"
), the axial direction of the rotating shaft 14' extends along the vertical direction, and the reflecting surface 16' of the swinging mirror 16'
a is arranged to face the reflective surface 16a of the swinging mirror 16 of the first beam scanner 12 from the side.

17 is a predetermined exposure beam 18, for example, the wavelength is 3600.
A laser beam oscillator 19.20 oscillates an argon ion laser of I11 (nanometers) or a helium cadmium laser with a wavelength of 325 nm, and a laser beam oscillator 19.20 directs the exposure beam 18 oscillated from the laser beam oscillator 17 in a predetermined direction and sequentially totally reflects it. and the second beam scanner 1
The total reflection mirror 21 for making the light incident on the swinging mirror 16' of No. 3 is an A10 modulator (acousto-optic modulator) disposed between these two total reflection mirrors 19 and 20.
2 is a focus controller having a focusing lens 23 disposed between one total reflection mirror 20 and the second beam scanner 13.

The exposure beam 18 oscillated from the laser beam oscillator 17 is reflected by the total reflection mirror 19 toward the A10 modulator 21.
Due to the switching action of the optical deflection state at 1, the progression from there to the optical path ahead is controlled ON-OFF, and A
10 When the switching of the modulator 21 is ON, the light beam enters the total reflection mirror 20 and is reflected here toward the focusing lens 23. When passing through the focusing lens 23, the light beam is narrowed down, and the light beam is divided into two swinging mirrors 16. ', 16 and irradiates the photocurable molten resin 4 from above. The light flux of such an exposure beam 18 is condensed by a focusing lens 23, so that the liquid surface 4a of the photocurable molten resin 4 is always focused and irradiated with a beam spot 18a having a predetermined diameter.
Further, when the rotating shaft 14 of the first beam scanner 12 rotates and the swinging mirror 16 thereof swings, the liquid surface 4a of the photocurable molten resin 4 is scanned in the first scanning direction. ,
The rotating shaft 14' of the second beam scanner 13 rotates, and the swinging mirror 16' swings, thereby scanning the liquid surface 4a of the photocurable molten resin 4 in the second scanning direction. be done.

(a-3, Control Section) [Figures '41 to 3] 24 is a control section.

25 is an elevator position detection sensor arranged parallel to the feed screw 10, and 26 is an elevator controller. A signal indicating the position of the elevator 5 detected by the sensor 25 is manually inputted, and the stepping motor is controlled according to the signal. 90 rotations, and thereby the position of the elevator 5 is controlled.

27 is an A10 modulator controller that controls the switching operation of the A10 modulator 21; 28 is a galvano controller;
Beam scanner 12.13 and focus controller 22
The operation is controlled by instructions from the galvano controller 28.

29 is a circuit of such a control section 24.

30 is a stereoscopic image programming device (not shown), for example,
This is a memory connected to a so-called CAD, and data signals decomposed in the X and Y directions of the decomposition plane of a 3D image arbitrarily designed by a 3D image programming device are manually input and temporarily stored.

Reference numeral 31 denotes a modulation circuit connected to the memory 30, and the individual data signals of the decomposition plane temporarily stored in the memory 30 are converted into a raster, that is, the photocurable molten resin 4 of the exposure beam 18, in the modulation circuit 31. It is converted into a coordinate signal indicating the position of the liquid level 4a with respect to the scanning area.

32 is a beam position control circuit including the memory 30 and the modulation circuit 31.

33a and 33b are D/A connected to the modulation circuit 31.
The conversion circuits 34a and 34b are the D/A conversion circuit 33a.
, 33b and separately connected to the first beam scanner 12 and the second beam scanner 13, and of the coordinate signals converted by the modulation circuit 31, the The signal in the scanning direction is D/A
After being converted into analog No. 15 in the conversion circuit 33a, it is output to the drive section 15 of the first beam scanner 12 via the gate 34a, and the coordinate signal in the Y direction, that is, the second scanning direction is D 7''A After being converted into an analog signal in the conversion circuit 33b, it is outputted to the drive section 15' of the second beam scanner 13 via the gate 34b, and the drive section 15, 15' is configured to receive the respective signals. During this period, the swinging mirrors 16 and 16' are respectively swung.

35 is a line scanning direction switching circuit, that is, the exposure beam 18
This is a circuit for sequentially switching the line direction of the rask scan of the beam spot 18a between the first scanning direction and the second scanning direction, and the gates 34a and 34b are opened and closed by commands from the line scanning direction switching circuit 35. Each time the rask scan for one resolution plane is completed, the line scanning direction is switched to the first scanning direction or the \iS2 scanning direction. That is, the exposure beam 18 for a certain resolution plane
When scanning is performed with the first scanning direction as the line scanning direction, the scanning of the exposure beam 18 for the next resolution plane is performed with the second scanning direction as the line scanning direction, and then for the next resolution plane, The first scanning direction is the line scanning direction. Therefore, when the line scanning direction is the first scanning direction, the gate 34b is momentarily opened every time the scanning of one scanning line in the first scanning direction is completed, and thereby the gate 34b is opened for a moment. By slightly rotating the swinging mirror 16', the exposure beam 18
The line position of the line scan is moved onto the adjacent line in the second scanning direction. Further, when the line scanning direction is the second scanning direction, the gate 3 of the exposure beam 18
4a is momentarily opened every time scanning of one scanning line in the second scanning direction is completed, and this causes the swinging mirror 16 of the first beam scanner 12 to rotate a little to change the line scanning of the exposure beam 18. The line position is moved υ onto an adjacent line in the first scanning direction.

36 is A1 connected to the beam position control circuit 32
This is a 0 modulator driving circuit, and outputs the u+IN signal to the transducer of the A10 modulator 21 depending on the presence or absence of a signal on one line in the X direction or one line in the Y direction of the plane data. , A of the exposure beam 18 emitted from the laser beam oscillator 17h)
10 The optical path beyond the modulator 21 is turned off.

Reference numeral 37 denotes a focus control circuit, which controls the focusing lens 2 so that the exposure beam 18 is focused at a spot of a predetermined diameter on the liquid surface 4a of the photocurable molten resin 4 at 59 o'clock.
3 in the focusing direction.

Reference numeral 38 denotes a motor drive circuit, and the stepping motor 9 is driven by a command from this motor drive circuit 38, and when the operation of forming an object is started, the stepping motor 9 is driven by the elevator 5 whose stage 6 is made of photocurable molten resin. 4 liquid level 4a
It is controlled so that it is moved to a position one layer pitch below (hereinafter referred to as the "initial position"), and after the above-mentioned formation operation is started, the formation for one decomposition plane is completed. The elevator 5 is controlled to move downward by one floor pitch each time.

(b. Three-dimensional image forming method) Therefore, forming a three-dimensional image using such a three-dimensional image forming apparatus 1 is performed as follows.

It is assumed that the designed stereoscopic image has the same shape as the stereoscopic image m shown in FIG.

Then, when I started the 5 formation movement, first, Elm I\-Yu 5
is moved to the initial position d, and stage 6 of elevator 5
A photocurable molten resin 4 is placed on the upper surface of the photocurable molten resin 4 at a thickness equivalent to one layer pitch.

From this state, the exposure beam 18 performs a rask scan on a region of the photocurable molten resin liquid surface 4a corresponding to the stage 6. This rask scanning is performed for each decomposition plane of the three-dimensional image, and the order is sequentially performed from either one of the two end decomposition planes in two directions among the many decomposition planes. Furthermore, scanning for one resolution plane is performed with the line scanning direction set as either the first scanning direction or the second scanning direction, and when the first scanning direction is set as the line scanning direction, the first beam Line scanning is performed by swinging the swinging mirror 16 of the scanner 12, and each time one line scanning is completed, the second
By rotating the swinging mirror 16' of the beam scanner 13 by an angle corresponding to one line pitch and sequentially moving the line position of the line scan in the second scanning direction, raster scanning for the one resolution plane is performed. When the second scanning direction is a line scanning direction, line scanning is performed by swinging the swinging mirror 16' of the second beam scanner 13, and each time one line scanning is completed, the line scanning is performed. By rotating the oscillating mirror 16 of the first beam scanner 12 by an angle corresponding to one line pitch and sequentially moving the line position of the line scan in the first scanning direction, scanning for the one decomposition plane is performed. .

In this way, when the raster scanning of the exposure beam 18 on the liquid surface 4a of the photocurable molten resin 4 for one resolution plane is completed, the area of the liquid surface 4a that has been raster scanned by the exposure beam 18 is cured, As a result, one hardened layer 39 having the same shape as the decomposition plane to be formed first is formed. In addition, in FIG. 4, the broken lines 40.4 partially drawn in these hardened layers 39.39, . . .
0,... or 41.41,... indicate the line scanning direction, for example, the hardened layer 39. is formed with the first scanning direction as the line scanning direction of the exposure beam 18.

When one hardened layer 39 is formed, the elevator 5
is moved downward by one layer pitch. As a result, the already formed hardened layer 39. The photocurable molten resin 4 flows onto the layer to a thickness corresponding to one layer pitch.

From this state, the next order, that is, raster scanning of the exposure beam 18 with respect to the second resolution plane is performed. In this case, the line scanning direction of the exposure beam 18 is the second scanning direction.

As a result, a hardened layer 392 corresponding to the second decomposition plane is formed, and when this hardened layer 39□ is hardened, the hardened layer 392 is
The hardened layer 391 is bonded to the upper surface of the hardened layer 391.

By repeating this operation, a large number of hardened layers 39. ．． 39□, .

The three-dimensional image 42 formed in this way has the line scanning directions of the cured layers 39, 39, . The direction of warpage due to the action is not constant, and therefore, even if there is a portion 42a that is located so as to protrude from other parts, as in the illustrated three-dimensional image 42, no significant warpage will occur in this portion 42a. .

In addition, since the line scanning direction is different for every other cured PJ, the start and end points of this line scanning do not appear only on the - side of the 3D image, and therefore it is possible to obtain a 3D image with a smooth surface on any side. can.

(G Effect of the Invention) As is clear from the above description, the three-dimensional image forming method of the present invention scans the surface of a molten photocurable resin in a first direction with a light spot to form a cured layer of a predetermined thickness. After that, a molten photocurable resin layer of a predetermined thickness is positioned on the first cured layer, and a light spot is applied to the molten photocurable resin layer in a second direction intersecting the first scanning direction. A three-dimensional image is formed by scanning in the direction of , and laminating a second cured layer on top of the first cured layer.

Therefore, according to the three-dimensional image forming method of the present invention, the direction of contraction of the photocurable molten resin that is cured in a line by raster scanning of the exposure beam is different for each one or a plurality of cured layers.
The direction of the warp of the cured layer becomes undefined, which makes it possible to eliminate or suppress the distortion that occurs in the formed 3D image, making it possible to form a 3D image with high dimensional accuracy. The starting point or end point does not appear only on the - side of the stereoscopic image, and the surface of the stereoscopic image can be made smooth.

In the above embodiment, the direction of line scanning of the beam spot was changed every time one hardened layer was formed, but in some cases, a certain number of hardened layers, two or more, may be formed. The line scanning direction may be switched each time the line scanning is completed, and it is not necessary to always switch the scanning direction for each fixed cured layer, but it may be set as appropriate depending on the shape of the three-dimensional image. Good.

Furthermore, in the above embodiments, the first line scanning direction and the second line scanning direction are perpendicular to each other.
However, the present invention is not limited to this, and, for example, line scanning may be performed with a shift of 60° so that the formed three-dimensional image has three types of hardened layers with different line scanning directions.

The three-dimensional image forming method of the present invention is not limited to the method carried out by the three-dimensional image forming apparatus having the structure shown in the embodiments, and the three-dimensional image forming apparatus shown in the embodiments is limited to the present invention. This is an example of an apparatus for carrying out the invention three-dimensional image forming method, and the type of photocurable melt resin, the type of exposure beam, the shape of the three-dimensional image, etc. are not limited to those shown in the example. None.

[Brief explanation of the drawing]

1 to 3 show an example of a three-dimensional image forming apparatus for implementing the three-dimensional image forming method of the present invention, FIG. 1 is a perspective view of the whole with a part cut away, and FIG. 3 is a block circuit diagram of the control section, FIG. 4 is a conceptual diagram showing the formed three-dimensional image partially separated into each hardened layer, and FIG. and FIG. 6 are for explaining a conventional three-dimensional image forming method, FIG. 5 is a sectional view showing an example of a three-dimensional image forming apparatus, FIG. 6 is a diagram for explaining scanning of a light spot, FIG. 7 is a diagram for explaining problems in the conventional three-dimensional image forming method. Explanation of symbols 4 ・ ・ 4 a ・ 8 a 39 ・ 41 ・ Photo-curing resin, ・Surface of photo-curing resin, ・・Light spot, ・Curing layer, 40 ・・・Second direction・First direction, Photo-curing Fig. 2 A partially cutaway front view of the surface working part of the resin photocurable enema Fig. 2 A sectional view of the three-dimensional image forming mold (conventional example) Fig. 5

Claims (1)

[Claims] A light spot scans the surface of the molten photocurable resin in a first direction to form a cured layer with a predetermined thickness, and then a molten photocurable resin layer with a predetermined thickness is formed on the first cured layer. and scan the molten photocurable resin layer with a light spot in a second direction intersecting the first scanning direction to stack a second cured layer on the first cured layer. A three-dimensional image forming method characterized by forming a three-dimensional image using