JPS60168615A - Molding method of three dimensional article - Google Patents

Abstract

PURPOSE:To mold a colored molded article, by compounding a heat-sensitive coloring agent into resin and making the same color with infrared rays, in a method molding a three dimensional article by curing in order said ultraviolet- curing photosensitive resin in layers. CONSTITUTION:The inside of a tank 11 is filled with photosensitive resin 12 which is compounded with a heat-sensitive coloring agent 13, and a sunproofing film 21 having an opening part 21b is mounted on a film mounting stand 16. The resin which is on the upper part of a receiving stand 14 is made into a solidified layer to the extent of 2mm. thick by irradiating ultra violet rays, platelike body 32a of 8mm. thick is formed further by making the resin cure while the receiving stand 14 is being made to decend 2mm. by 2mm., a cylindrical part 31 is formed similarly by replacing the film 21 with a film 22, a bottom part platelike body 32b is formed similarly at last, and colored molded article is manufactured by making arbitrary position color by irradiating infrared rays further. Coloring can be made to perform by irradiating the infrared rays during molding.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a method for forming a three-dimensional object, and more particularly to a method for obtaining a colored three-dimensional object.

(bl) Conventional technology and problems Conventional methods for obtaining three-dimensional objects include three-dimensional machining methods using NC (numerically controlled) machine tools, but such methods only process the surface shape and cannot process internal parts. .

Furthermore, it is difficult to form three-dimensional objects with complex shapes.

On the other hand, in recent years, methods have been proposed for forming three-dimensional objects using photosensitive resins. This takes advantage of the property of photosensitive resin that the light-receiving area solidifies when irradiated with ultraviolet rays.The resin is sequentially irradiated with ultraviolet rays in a pattern corresponding to the cross-sectional shape of a two-dimensional object to obtain a solidified layer, and this is then A three-dimensional object made of resin is obtained by laminating layers.

However, since the obtained object is transparent or semi-transparent, it is difficult to understand the shape of the internal portion of the object.

(C1 Purpose of the Invention This invention relates to a method for forming an object using a photosensitive resin,
A method of forming an object is provided that allows the object to be partially colored.

(di) Structure of the Invention For this purpose, the present invention focuses on a material that develops color in response to heat, and mixes the heat-sensitive coloring material with a photosensitive resin.

That is, by irradiating a photosensitive resin with a pattern corresponding to the cross-sectional shape of a three-dimensional object, a solidified layer having the cross-sectional shape and a predetermined thickness is formed by irradiating the photosensitive resin, which solidifies in the portion irradiated with ultraviolet light. , in a method of forming a three-dimensional object by stacking solidified layers obtained by irradiating new photosensitive resin while sequentially changing the pattern according to the cross-sectional shape of the three-dimensional object, in a liquid of the photosensitive resin; It is characterized in that a heat-sensitive coloring material is mixed in and the object formed is colored by selectively coloring the heat-sensitive coloring material.

(81 Embodiments of the Invention Below, embodiments of the method for forming a three-dimensional object according to the present invention will be described in detail.

FIG. 1 is a side view showing a three-dimensional object forming apparatus, in which a tank 11 is filled with a photosensitive resin 12.

The photosensitive resin 12 mainly reacts to ultraviolet rays with a wavelength of 30Q nm to 400 nm, and the irradiated portions harden (solidify).
do. The thickness can be controlled by the amount of light (light energy) to be irradiated, and is usually selected to form 2 to 3 mm0)N. Furthermore, this photosensitive resin 12 contains a thermosensitive coloring material 1.
3 are mixed. The thermosensitive coloring material 13 has the property of developing color in response to heat, and is, for example, leuco crystal violet, leucomalachite green, or the like. This type of heat-sensitive coloring material 13 does not affect the photocuring action of the photosensitive resin 12, and does not have any coloring action due to ultraviolet rays.

A pedestal 14 is provided in the tank 11, and the pedestal 14 is moved by a predetermined amount in the direction of the arrow within the tank 1 by a drive unit 15. A film installation stand 16 is provided above the tank 11, and a film to be described later is installed on this installation stand 16.

Furthermore, an ultraviolet lamp 17 is provided above the film installation stand 16. The ultraviolet lamp 17 is lit intermittently, and the lighting time is set constant. The ultraviolet rays from the lamp 17 irradiate the photosensitive resin 12 in the tank 11 through the film placed on the film installation stand 16.

Now, assuming that the shape of the three-dimensional object 30 to be formed is that plate-like bodies 32a and 32b are fixed to both ends of a cylinder 31 as shown in FIG. 3, a method for forming the three-dimensional object 30 will be described. First, move the drive unit 15 so that the top surface of the pedestal 14 is 211I from the liquid level.
Set it so that it is about m downward. At the same time, a film 21 as shown in FIG. 2 (al) is installed on the film installation stand 16. This film 21 has a pattern corresponding to a cross section of the plate-shaped body 32b on a plane perpendicular to the central axis O of the object. That is, in the film 2I, 21a is an area that blocks ultraviolet rays, and 21b is an area that transmits ultraviolet rays.

In this state, the ultraviolet lamp 17 is turned on for the predetermined period of time. Since only the ultraviolet rays that reach the photosensitive resin 12 correspond to the region 21b of the film 2, the photosensitive resin 12 has a thickness of, for example, 2 m+*, and a solidified layer corresponding to the cross-sectional shape of the plate-shaped body 32b. It is formed on the pedestal 14. Next, the drive unit 15 is operated to lower the pedestal 14 by a predetermined distance. Therefore, new unsolidified photosensitive resin 12 flows above the solidified layer. In this state, the ultraviolet lamp 17 is turned on again to solidify the resin 12, and a new solidified layer is laminated on the previous solidified layer. Now, assuming that the thickness of the plate body 32b is 8IllI11, the above steps are repeated four times without changing the film 21.

Next, the film 21 is changed to 22. This film 22 has a pattern corresponding to a cross section of the cylinder 31 on a plane perpendicular to the central axis 0 of the object.

That is, in the film 22, 22a is a region that blocks ultraviolet rays, and 22b is a region that transmits ultraviolet rays.

When the ultraviolet lamp 17 is turned on in this state, a solidified layer of the photosensitive resin 12 having a thickness of 2 au++ and corresponding to the cross-sectional shape of the cylinder 31 is formed. Next, move the drive unit 15 to the pedestal 1.
4 is lowered to supply new resin 12 to the formed solidified layer. If the length of the cylinder 31 is 16+m, then the film 2
Repeat the above steps 8 times without changing step 2.

Next, the film 22 is changed to 21 and the above steps are repeated 4 times.
By repeating this process several times, the plate-like body 32a of the object 30 is formed (in this example, the shape and thickness of the plate-like bodies 32a and 32b are the same).

Through the above process, a three-dimensional object 30 as shown in FIG. 3 is formed in the tank 11.

In this state, the thermosensitive coloring material 1 mixed into the photosensitive resin 12
Since resin 3 does not react with ultraviolet light, object 30 formed of resin 12 is transparent or semi-transparent. This is taken out from the tank 11, and the part of the object 30 to be colored is irradiated with an infrared lamp 33 as shown in FIG. The thermosensitive coloring material 13 in the area irradiated with infrared rays develops color in response to the heat of the infrared rays, and only that area is colored in a predetermined color.

Although the above embodiment is an example in which the object is colored after forming the three-dimensional object, an example in which the object is colored while being formed will be described below.

In FIG. 4, 41 is an infrared lamp, and the infrared rays are emitted from the film installation stand 16 in the same way as the ultraviolet lamp 17.
The photosensitive resin 12 is irradiated through the film placed above. To explain the formation process, first, the film installation table 16
A film 51 as shown in FIG. 5 (al) is set on top. This film 51 is the same as the film shown in FIG.
It has a pattern corresponding to the cross-sectional shape of b. That is, in the film 51, 51a is a region that blocks ultraviolet rays, and 51b is a region that transmits ultraviolet rays. When the ultraviolet lamp 17 is turned on in this state, the resin 12 has a thickness of 2+++
m solidified layers are formed. In this state, the film 51 is
2, and the light source is changed from the ultraviolet lamp 17 to the infrared lamp 41, and the lamp 41 is turned on. In the film 52, 52a is a region that blocks infrared rays, and 52b is a region that transmits infrared rays, so that the heat-sensitive coloring material 13 in the resin in the right half of the solidified layer is exposed to the heat of this infrared rays. It reacts and develops color.

Next, the pedestal 14 is lowered, the film 52 is changed to 51, the light source is changed from the infrared lamp 41 to the ultraviolet lamp 17, and irradiation is performed. By repeating this process four times, a plate-shaped body 32b colored in a predetermined color is formed. Assuming that the cylinder 31 is not colored, the cylinder 31 is formed by repeating the irradiation of ultraviolet rays through the film 53 having the ultraviolet light blocking area 53a and the transmitting area 53b and the lowering of the pedestal 14 eight times. Next, similarly to 32b, the pedestal 14 is lowered four times while alternately selecting the irradiation of the films 51 and 52 and the lamps 17 and 41, thereby forming a plate-shaped body 32a colored in a predetermined color. .

By going through such a process, the plate-shaped body 32a is formed.

The right half of 32b is colored, and the cylinder 31 and plate-shaped body 32a,
A three-dimensional object in which the left half of 32b is transparent can be obtained. It should be noted that the timing for turning on the infrared lamp 41 to cause the coloring material 13 to undergo a coloring reaction does not need to be carried out every time a solidified layer is formed; in the above embodiment, after the irradiation by the lamp 17 has been repeated three times. The infrared lamp 41 may be irradiated all at once.

FIG. 6 shows an apparatus for simultaneously curing and coloring a photosensitive resin, in which ultraviolet lamps 17 and infrared lamps 41 are arranged alternately above the film installation table 1G. The lamps 17 and 41 are turned on at the same time, so that the photosensitive resin 12 is irradiated with ultraviolet light at the same time as infrared light.

To explain the formation process of a three-dimensional object, first of all, Figure 7 (8)
A film 71 as shown in FIG.
light up at the same time. The film 71 has a region where Via blocks both ultraviolet and infrared rays, and a region 71b which transmits ultraviolet rays but blocks infrared rays. The IC is a region that transmits both ultraviolet and infrared rays. Therefore, when the lamps 17 and 41 are turned on, a solidified layer of the photosensitive resin 12 having a thickness of 2+w+++ and corresponding to the cross-sectional shape of the plate-shaped body 32b is formed. Since the thermosensitive coloring material 13 in this solidified layer undergoes a coloring reaction at the same time as the resin is cured, the right half of the solidified layer is colored in a predetermined color, and the left half is transparent or translucent. By repeating this process four times while lowering the pedestal 14, a plate-shaped body 32b colored in a predetermined color and having a thickness of 8Il111 can be formed.

Next, the cylinder 31 is formed by changing the film 71 to 72. The film 72 corresponds to the one shown in FIG. , 72b are areas that transmit ultraviolet rays but block infrared rays. Therefore, when the film 72 is set and the lamps 17 and 41 are turned on at the same time, the photosensitive resin 12 has a thickness of 2 mm and has a cross-sectional shape of the cylinder 31. A corresponding solidified layer is formed.

This solidified layer is transparent or translucent because the infrared rays are blocked by the film 72 and the heat-sensitive coloring material 13 mixed in the resin does not react.

The cylinder 31 is formed by repeating this process eight times while lowering the pedestal I4.

The plate-like body 32a is formed similarly to the plate-like body 32b by repeating the above process four times using the film 71, the right half of which is colored in a predetermined color, and the left half of which is transparent or semi-transparent. A transparent plate-like body 32a is completed.

Note that when forming the cylinder 31, the ultraviolet lamp 17
By controlling the infrared rays 41 to turn on and not to turn on the infrared rays 41, the area 72a of the film 72 becomes an ultraviolet ray shielding area.
It is possible to use the same film as in FIG. 2 (bl) or FIG. 5 (C1) in which 72b is the ultraviolet transmitting region.

The embodiments shown in FIGS. 1 to 7 are all examples in which a film is used, but FIG. 8 shows an embodiment in which a film is not used. In FIG. 8, the photosensitive resin 12 filled in the tank 11 is mixed with a thermosensitive coloring material, and the resin is provided with a pedestal that can be lowered and raised by a drive unit, as described above. This is similar to the example. The rotating polygon 1181 is placed above the tank 11 via an optical system such as a lens, and is rotated at a constant speed in the direction of the arrow. Ultraviolet laser light and infrared laser light are incident on the rotating polygon mirror 81 . Ultraviolet laser light is emitted from a laser light source 82, and is transmitted through a light modulator 82a.
The infrared laser beam is emitted from the laser light source 83 and is input via the optical modulator 83a. Image information corresponding to the cross-sectional shape of a two-dimensional object to be formed is input to the light modulator 82a, and information about which part of the object to color is manually input to the light modulator 83a. While the tank 11 is moving in the direction of the arrow in synchronization with the rotation of the rotating polygon mirror 81,
Selectively apply UV laser light and infrared laser light to resin 1
A partially colored three-dimensional object is formed by irradiating the object 2 and repeating the lowering of the pedestal.

(fl Effects of the Invention As described above, according to the present invention, by irradiating a photosensitive resin with ultraviolet rays in a pattern corresponding to the cross-sectional shape of a three-dimensional object, a solidified layer having the cross-sectional shape and a predetermined thickness is formed. When forming a three-dimensional object by stacking solidified layers obtained by irradiating new photosensitive resin while changing the pattern sequentially according to the cross-sectional shape of the three-dimensional object, Since the formed object is colored by mixing a thermosensitive coloring material and selectively coloring the thermosensitive coloring material, it becomes easy to grasp the three-dimensional shape.

[Brief explanation of the drawing]

The drawings relate to the present invention; FIGS. 1, 4, 6, and 8 are side views showing a three-dimensional object forming device, and FIG. 2 is a top view of a film used in the device shown in FIG. 1. , Fig. 3 is a side view showing the process of coloring the formed object, Fig. 5 is a top view of the film used in the apparatus of Fig. 4, and Fig. 7 is a view of the film used in the apparatus of Fig. 6. FIG. In the figure, 12 is a photosensitive resin, 13 is a thermosensitive coloring material, 17 is an ultraviolet lamp, 41 is an infrared lamp, 82 is a laser light source for emitting ultraviolet light, and 83 is a laser light source for emitting ultraviolet light. Figure 1 Figure 3m 'llO Figure 4 Figure 6 Figure 7 Figure 1h Figure 8 Procedure Tadashi Neichi 〒W (Sponsored) June 19, 1981 Patent Application No. 25695 2, Title of the Invention Three-dimensional object formation method 3, relationship with the amendment person case Patent applicant address 1015 Kamiodanaka, Nakahara-ku, Yozaki City, Kanagawa Prefecture (
522) Name: Fujitsu Limited Representative: Takuma Yamamoto 4, Agent Postal code: 211 Address: Ri Kanagawa. Kami Elementary School, Nakahara Ward, Kawasaki City + tl Lll
t015@earth 8,? #Correct content Tl + Attachment (Amend Figure 7 of 1 drawing as shown in the attached sheet. 9. Attached document catalog correction drawings 1 copy or more

Claims (1)

[Claims] A solidified layer having the cross-sectional shape and a predetermined thickness is formed by irradiating the photosensitive resin with a pattern corresponding to the cross-sectional shape of the three-dimensional object onto the photosensitive resin, which solidifies in the portion irradiated with the ultraviolet rays. Irradiate the new photosensitive resin while changing the pattern sequentially according to the cross-sectional shape of the three-dimensional object.
In the method of forming a three-dimensional object by laminating three solidified layers, a heat-sensitive coloring material is mixed into the liquid of the photosensitive resin, and the formed object is colored by selectively coloring the heat-sensitive coloring material. A method for forming a three-dimensional object, characterized by: