Optical shaping apparatus and method of manufacturing shaped object

Abstract

To provide an optical shaping apparatus capable of accurately molding a shaped article, and a method for manufacturing the shaped article.SOLUTION: A platform 12 that faces the shaping tank 11, can be lifted and lowered with respect to the shaping tank 11, holds the cylindrical partition wall 213 molded by radiation of the light L, and forms an airtight space 3 in cooperation with the partition wall 213, a lifting and lowering control unit 231 that lifts and lowers the platform 12 and forms a photocurable layer having a predetermined thickness between a lower surface 213A of the partition wall 213, a lower surface 3A of the space 3, and the light transmissive plate 14, and a radiation control unit 232 that radiates the light L corresponding to a cross-sectional shape at a predetermined height in the partition wall 213 from the light radiating unit 20 to the photocurable layer to form each cured layer.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a photolithography apparatus and a method for manufacturing a model. [Background technology]

[0002] Generally, a liquid photocurable resin is irradiated with light such as ultraviolet light, and the cured resin is then Patent Document 1 describes a so-called standard photolithography technique for forming a three-dimensional object. As a liquid level control method, the light-curing resin is stored in a liquid tank, and the liquid level is measured through a light-transmitting window at the bottom of the tank. A cross section (predetermined cross section) of the object at a predetermined height position facing the base placed opposite the light-transmitting window ) is irradiated onto the underside of the base with light corresponding to the predetermined cross section, and a layer of hardened resin (hardened The process of forming the layer and the process of lifting the base up by a predetermined height relative to the liquid tank are repeated. This paper discloses a photolithography technology that repeats the process to stack hardened layers to form a desired object. do. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-62841 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional liquid level control method, the object formed by stacking hardened layers is Therefore, the irradiated light is absorbed into the excess photo-curable resin. This can cause the resin to harden, leaving room for improvement in terms of molding objects with precision.

[0005] The present invention has been made in view of the above, and is a method for forming a shaped object with high precision. The present invention aims to provide a photo-fabrication apparatus and a method for manufacturing a model. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the optical shaping apparatus according to the present invention is a photocurable resin is stored in a modeling tank having a light-transmitting portion on the bottom thereof, and the photocurable resin is transferred through the light-transmitting portion; The light irradiating section irradiates light to harden the resin, and the light transmitting section faces the light irradiating section, and the light irradiating section is movable up and down relative to the modeling tank. and a platform that holds a cylindrical partition wall formed by irradiation of light and cooperates with the partition wall to form an airtight space, and a device that raises and lowers the platform and forms the photocurable resin layer of a predetermined thickness between the bottom surface of the partition wall, the lower surface of the airtight space, and the light transmitting portion. and an irradiation control unit that irradiates the photocurable resin layer with light corresponding to the cross-sectional shape of the partition wall at a predetermined height from the light irradiation unit to form a cured layer.

[0007] The present invention also provides a molding tank that stores a photocurable resin and has a light-transmitting portion on its bottom surface; The light irradiating section irradiates light to cure the photocurable resin through the light transmitting section, and the light irradiating section faces the light transmitting section. The object can be raised and lowered relative to the forming tank, and the object is illuminated with light to move around the object. a platform that holds a cylindrical partition wall to be formed and cooperates with the partition wall to form an airtight space; A method for manufacturing a shaped object using a stereolithography device comprising: A photocurable resin layer of a predetermined thickness is formed between the bottom surface of the wall and the lower surface of the airtight space and the light transmitting portion. A light irradiation unit irradiates light corresponding to the cross-sectional shape of the step, the molded object, and the partition wall at a predetermined height. and then irradiating the photocurable resin layer with the light to form a cured layer. [Effects of the Invention]

[0008] According to the present invention, an effect is achieved in that a shaped object can be formed with high precision. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the basic configuration of a photo-fabrication apparatus according to the first embodiment. [Figure 2] FIG. 2 is a diagram for explaining the steps of the method for manufacturing a shaped object according to the first embodiment. [Figure 3] FIG. 3 is a diagram for explaining the steps of the method for manufacturing a shaped object according to the first embodiment. [Figure 4] FIG. 4 is a diagram for explaining the steps of the method for manufacturing a shaped object according to the first embodiment. [Figure 5] FIG. 5 is a diagram for explaining the procedure of the method for manufacturing a shaped object according to the first embodiment. [Figure 6] FIG. 6 is a diagram for explaining the steps of the method for manufacturing a shaped object according to the first embodiment. [Figure 7] FIG. 7 is a diagram illustrating the steps of the method for manufacturing a shaped object according to the first embodiment. [Figure 8] FIG. 8 is a schematic diagram showing the basic configuration of a photo-fabrication apparatus according to the second embodiment. [Figure 9] FIG. 9 is a schematic diagram showing the basic configuration of a photo-fabrication apparatus according to the third embodiment. [Figure 10] FIG. 10 is a diagram illustrating the steps of the method for manufacturing a shaped object according to the third embodiment. [Figure 11] FIG. 11 is a diagram for explaining the procedure of the method for manufacturing a shaped object according to the third embodiment. [Figure 12] FIG. 12 is a diagram illustrating the steps of the method for manufacturing a shaped object according to the third embodiment. [Figure 13] FIG. 13 is a diagram illustrating the steps of the method for manufacturing a shaped object according to the third embodiment. [Figure 14]FIG. 14 is a diagram illustrating the steps of the method for manufacturing a shaped object according to the third embodiment. [Figure 15] FIG. 15 is a schematic diagram showing the basic configuration of a photo-fabrication apparatus according to the fourth embodiment. [Figure 16] FIG. 16 is a diagram for explaining the operation of the suction mechanism of the optical shaping apparatus according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments, and when there are multiple embodiments, each The embodiments may be configured by combining the embodiments. The same symbols are used for the units to avoid redundant explanation.

[0011] In the following description of the embodiments, unless otherwise specified, the uncured Liquid photocurable resin is simply called photocurable resin. Also, when liquid photocurable resin is cured, The molded object is called a three-dimensional object or simply a molded object. It is not limited to the finished product in which all the hardened layers are laminated, but also includes intermediate hardened layers. This also includes unfinished products that have not yet been completed. [First embodiment] 1 is a schematic diagram showing the basic configuration of a photo-fabrication apparatus according to a first embodiment. As shown in FIG. 1, 10 includes a modeling tank 11, a platform 12, a partition wall 13, and a light irradiation In this embodiment, the optical shaping apparatus 10 includes a chamber 40 and a chamber internal pressure adjusting unit 41.

[0012] The modeling tank 11 has a dish shape with an open top and is capable of storing the liquid photocurable resin 1. The modeling tank 11 has a light-transmitting plate (light-transmitting portion) 14 on the bottom surface. The port 14 transmits light that hardens the photo-curable resin 1 .

[0013] The photocurable resin 1 is a raw material for the three-dimensional object 2, and may be, for example, an acrylic compound or a vinyl compound. The photocurable resin 1 contains a polymerizable compound such as a compound. The photocurable resin 1 generates radical species and the like by irradiation with light. It is preferred to include a polymerization initiator.

[0014] The platform 12 holds the object 2 made of the cured photocurable resin 1. The platform 12 is disposed above the modeling tank 11, facing the light-transmitting plate 14. , for example, in the shape of a polygonal plate such as a circular plate or a square plate, and the lower surface 12A thereof is light-transmitting. The platform 12 is arranged so as to be substantially parallel to the plate 14. The platform is connected to a platform lifting mechanism 15, and the operation of the platform lifting mechanism 15 The platform 12 is provided so as to be able to move up and down relative to the tank 11. Specifically, the platform 12 is a light-transmitting It is possible to approach and retreat from the light-transmitting plate 14. The molded object 2 is held on the lower surface 12A facing the upper surface 12A.

[0015] The partition wall 13 is disposed on the outside of the platform 12 and separates the platform 12 and the structure. The partition wall 13 has a cylindrical shape (cylindrical) corresponding to the shape of the platform 12. The partition wall 13 is formed in a polygonal cylindrical shape such as a rectangular cylindrical shape. The partition wall is connected to a lifting mechanism 16, and by the operation of the partition wall lifting mechanism 16, the platform 12 That is, the partition wall 13 is provided so as to be able to move up and down relative to the platform 12. It is possible to rise or fall relative to the

[0016] In addition, on the outer periphery of the platform 12, there is a gap between the platform 12 and the bulkhead 13. An airtight member 17 is provided for sealing. The airtight member 17 is made of an elastic material such as rubber. The airtight member 17 is an O-ring formed by a material. The air is forced against the inner surface of the partition wall 13, forming a seal between the platform 12 and the partition wall 13. The sealing member 17 ensures airtightness between the platform 12 and the partition wall 13. When the platform 12 and the partition wall 13 are lowered into the photocurable resin 1, A space 3 (airtight space) is formed by the partition wall 13 and the photocurable resin 1. will be done.

[0017] The light irradiation unit 20 is located below the modeling tank 11, that is, on the platform with the light-transmitting plate 14 in between. The light irradiation unit 20 is disposed on the opposite side of the room 12. The light irradiation unit 20 emits light through the light transmission plate 14. The light L that hardens the photocurable resin 1 is irradiated toward the photocurable resin 1. Any light capable of curing the curable resin 1 may be used, for example, ultraviolet light or short wavelength visible light. The light irradiation unit 20 includes a light source 21 such as an ultraviolet lamp, an image forming element 22, and a reflecting mirror 23. and a projection lens 24.

[0018] The light source 21 emits light to irradiate the image forming element 22, and is, for example, an ultraviolet lamp. The image forming element 22 performs the following operations according to the shape data of each layer of the object 2 to be formed. For example, LCOS (Liquid Crystal On Silicon) devices Digital mirror device (DMD) or LCD device The reflecting mirror 23 reflects the light modulated by the image forming element 22 onto the projection lens. The light reflected by the reflecting mirror 23 is reflected toward the projection lens 24. The projection lens 24 forms an image of the light reflected by the reflecting mirror 23. The light irradiation unit 20 is not limited to this, and may be, for example, a laser light source and a mirror drive. Laser scanning devices that use the movement of light, and optical devices that use reflective or refractive optical systems are used. Good too.

[0019] The chamber 40 includes at least a modeling tank 11, a platform 12, a partition wall 13, a light irradiation unit 2, and a 0 and each lifting mechanism 15, 16, etc., and seals the internal environment from the outside. The chamber internal pressure adjusting unit 41 supplies gas (e.g., air) to the inside of the chamber 40 through a pipe 42. The chamber 40 is opened by introducing gas (air, nitrogen, etc.) into the chamber 40 or exhausting the gas to the outside. By finely adjusting the internal pressure of the chamber 40, the above-mentioned air pressure can be reduced. This makes it possible to freely adjust the position of the lower surface of the space 3.

[0020] The control unit 30 is a computing device configured with, for example, a CPU (Central Processing Unit) or the like. The control unit 3 is a processing unit connected to each part of the optical shaping apparatus 10 and controls the operation of these parts. 0 stores a program relating to a manufacturing method for manufacturing the shaped object 2, and The control unit 30 loads the program into memory and executes the instructions contained in the program. The internal memory includes a memory that does not include data such as programs in the control unit 30. It is used for time memory etc.

[0021] The control unit 30 includes an elevation control unit 31, an irradiation control unit 32, and a chamber internal pressure control unit 33. The lift control unit 31 controls the operation of the platform lift mechanism 15 and the partition wall lift mechanism 16. By controlling the height positions of the platform 12 and the bulkhead 13, That is, the lifting control unit 31 controls the platform 12 and the partition wall 13 relative to the modeling tank 11. and the platform 12 can be raised and lowered relative to the partition wall 13. The lift control unit 31 controls the platform 12 and the partition wall 13 to be raised or lowered. By lowering the partition wall 13, a predetermined distance is formed between the lower surface of the partition wall 13, the lower surface of the space 3 and the light-transmitting plate 14. A photocurable resin layer having a thickness of 1000 nm is formed.

[0022] The irradiation control unit 32 may, for example, calculate the cross-section of the object at predetermined height intervals based on the three-dimensional shape data. The light irradiation pattern that indicates the surface shape is calculated, and the light source 21, the image forming element 22, etc. are controlled to form the light. The curable resin is irradiated with light. For this purpose, the irradiation control unit 32 detects a cross section of the object at a predetermined height position. Light corresponding to the shape is directed to the photo-curable resin layer between the lower surface of the space 3 and the light-transmitting plate 14. By irradiating the light, a hardened layer of a predetermined thickness can be formed. 3 monitors the position of the lower surface (liquid surface of the photocurable resin) of the space 3 inside the partition wall 13, Depending on the result, the internal pressure of the chamber 40 is adjusted. The light-hardening plate 14 can be fitted to the underside of the wall 13 and can be placed between the underside of the space 3 and the light-transmitting plate 14. The thickness of the conductive resin layer can be precisely defined.

[0023] Next, a method for manufacturing a shaped object according to the first embodiment will be described with reference to FIGS. These figures show a part of the optical shaping apparatus 10 shown in FIG. As shown in FIG. 1, the lift control section 31 is connected to the lower surface 12A of the platform 12 and the lower surface ( The height positions of the platform 12 and the partition wall 13 are adjusted so that the bottom surface 13A is flush with the Next, the lifting control unit 31 is positioned higher than the modeling tank 11 in which the photocurable resin 1 is stored. The platform 12 and the partition wall 13 are lowered into the forming tank 11, and the lower surface 13 of the partition wall 13 is A and the light transmitting plate 14 are placed at a position where a predetermined distance T is between them. The thickness is set to the thickness of one layer of the hardened layer to be molded (for example, several μm to 100 μm). In this case, a predetermined distance T is provided between the platform 12 and the light transmitting plate 14. A photocurable resin layer 1a having a predetermined thickness T is formed.

[0024] Next, the irradiation control unit 32 controls the 3D shape of the object 2 to be formed based on the 3D shape data of the object 2. An irradiation pattern showing the cross-sectional shape at a predetermined height of the object 2 is calculated, and the cross-sectional shape of the first layer is calculated. The light L corresponding to the light is irradiated onto the photocurable resin layer 1a through the light transmitting plate 14. The photocurable resin layer 1a is cured to have the same cross-sectional shape as the first layer. As shown, the platform 12 holds a hardened layer 2a having a predetermined thickness T, which will become the first layer.

[0025] Next, the lift control unit 31 moves the platform 12 and the partition wall 13 as shown in FIG. Then, the lift control unit 31 raises the lifting mechanism 32 and places it at a position higher than the modeling tank 11. Next, the lift control unit 31 raises the lifting mechanism 32 and places it at a position higher than the modeling tank 11. 1. The partition wall 13 is lowered by a predetermined thickness T relative to the platform 12 as shown in FIG. As a result, the lower surface 13A of the partition wall 13 is flush with the lower surface 2aA of the hardened layer 2a. Around the hardening layer 2a, a space (airtight space) partitioned by a platform 12 and a partition wall 13 is formed. )3 is formed.

[0026] Next, the lifting control unit 31 moves the platform 12 and the partition wall 13 into the modeling tank 11, and 13 and the light transmitting plate 14 is lowered vertically until the distance between the lower surface 13A of the light transmitting plate 14 and the light transmitting plate 13 is a predetermined distance T. In this case, the space 3 partitioned by the platform 12 and the partition wall 13 is an airtight space. Therefore, as shown in FIG. 6, a predetermined uniform thickness is formed between the lower surface 3A of the space 3 and the light transmitting plate 14. The photocurable resin layer 1a of T is formed.

[0027] Here, the lower surface 3A of the space 3 coincides with the liquid surface of the photocurable resin layer 1a. The height position of the liquid surface of the layer 1a is determined by the depth of the photocurable resin 1 in the area stored around the partition wall 13 and the There is a possibility that the temperature may vary depending on the surface area. The height position of the liquid surface of the photocurable resin layer 1a is appropriately adjusted using the inner pressure adjusting unit 41. The chamber internal pressure control unit 33 controls, for example, the liquid level of the photocurable resin layer 1 a inside the partition wall 13. The position is monitored, and depending on the result, the photocurable resin layer 1a is adjusted to a predetermined thickness T. The internal pressure of the chamber 40 is adjusted. For example, the chamber internal pressure control unit 33 adjusts the internal pressure of the chamber. By lowering the space 3 from the initial state, the lower surface 3A of the space 3 is lowered, and the photocurable resin layer 1 By adjusting the internal pressure of the chamber 40 in this way, the thickness of the The position of the lower surface 3A of the space 3 can be aligned with the lower surface 13A of the partition wall 13, and the photocurable resin Layer 1a may be in contact only with the underside 2aA of stiffening layer 2a.

[0028] Next, as shown in FIG. 6, the irradiation control unit 32 irradiates light L corresponding to the cross-sectional shape of the second layer. The light is irradiated onto the photocurable resin layer 1a through the transmission plate 14. As shown in FIG. 7, the second layer 1a is hardened to have the same cross-sectional shape as the second layer, and the second layer 1a has a predetermined thickness T. The first layer is laminated to form the hardened layer 2a. The lower surface 13A of the space 3 and the light-transmitting plate 14 are spaced apart by a predetermined thickness T. The photocurable resin layer 1a is formed, and the photocurable resin layer 1a is cured into a predetermined shape. The thickness of the molded object 2 can be precisely formed. In this embodiment, a space 3 can be provided around the previously formed hardened layer 2a. Therefore, the light L irradiated through the light transmitting plate 14 hardens the excess photocurable resin 1. This can prevent problems that may occur.

[0029] In this way, the elevation control unit 31 and the irradiation control unit 32 control the formation of the photocurable resin layer 1a and The formation of the hardened layer 2a is alternately performed to form the nth layer (n is a natural number) of the hardened layer 2a and the n+1th layer. The shaped object 2 can be formed by stacking the hardened layers 2a.

[0030] As described above, the optical molding apparatus 10 according to the first embodiment stores the photocurable resin 1 and has a light-transmitting surface on the bottom. The photocurable resin 1 is introduced into the molding chamber 11 through the light-transmitting plate 14. a light irradiation unit 20 that irradiates light L that hardens the resin, and a modeling tank 11 that faces the light transmission plate 14; A platform 12 that can be raised and lowered relative to the platform 12. At the same time, it is formed in a cylindrical shape and is arranged on the outside of the platform 12 via an airtight member 17. , a partition wall 13 which cooperates with the platform 12 to form an airtight space 3, and 2 and the partition wall 13 are respectively raised and lowered, and the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 are The lifting control section 31 forms a photocurable resin layer 1a having a predetermined thickness T between the light transmitting plate 14 and the lifting control section 31. and irradiating light L corresponding to the cross-sectional shape of the target object 2 at a predetermined height position from the light irradiation unit 20. and an irradiation control unit 32 that irradiates the photocurable resin layer 1a to form a cured layer 2a.

[0031] According to this configuration, the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 are connected to the light-transmitting plate 1 A photocurable resin layer 1a having a predetermined thickness T is formed between the photocurable resin layer 1a and the substrate 4, and the photocurable resin layer 1a is formed into a predetermined shape. Since the hardened layer 2a is hardened in a uniform shape, the thickness of the hardened layer 2a can be precisely formed, and the molded object can be precisely formed. In addition, with this configuration, the hardened layer 2 previously formed can be molded with high precision. Since a space 3 can be provided around the a, the light irradiated through the light transmitting plate 14 L can prevent the problem of curing the excess light-curable resin 1, and the molded object 2 can be accurately produced. It can be easily molded.

[0032] In addition, the lift control unit 31 lifts the platform 12 every time the formation of the hardened layer 2a is completed. In order to lower the partition wall 13 by a predetermined thickness T, the platform 12 and the partition wall 13 When the light-transmitting member 13 is lowered into the modeling tank 11, the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 are A photocurable resin layer 1a having a predetermined thickness T can always be formed between the substrate and the overplate 14. Therefore, the thickness of the hardened layer 2a can be formed with high precision, and the shaped object 2 can be formed with high precision. It can be molded well.

[0033] In addition, the lift control unit 31 lifts the platform 12 and In order to temporarily raise the partition wall 13 above the photocurable resin 1, the platform 12 and the partition wall Gas is introduced into the inside of the wall 13, forming an airtight space. The thickness of the molded object 2 can be precisely formed. Cut.

[0034] The lifting control unit 31 and the irradiation control unit 32 control the formation of the photocurable resin layer 1a and the cured layer The formation of the hardened layers 2a is alternately performed, and a plurality of hardened layers 2a are stacked on the platform 12 to form a shaped object. 2, the shaped object 2 can be formed with high precision.

[0035] The optical molding apparatus 10 includes at least a molding tank 11, a platform 12, a partition wall 13, and a chamber 40 that accommodates the light irradiation unit 20, and a chamber internal pressure adjusting unit that adjusts the internal pressure of the chamber 40. The pressure adjusting unit 41 and the chamber internal pressure control unit 33 for controlling the chamber internal pressure adjusting unit 41 are provided. Therefore, by adjusting the internal pressure of the chamber 40, the position of the lower surface 3A of the space 3 is adjusted to the lower surface 13 of the partition wall 13. A, and the photocurable resin layer 1a can be accurately defined to a predetermined thickness T. Therefore, the thickness of the hardened layer 2a can be formed with high precision, and the shaped object 2 can be formed with high precision. It can be molded well. [Second embodiment] Next, a stereolithography apparatus according to a second embodiment will be described. 1 is a schematic diagram showing the basic configuration of such a photo-fabrication apparatus. The same reference numerals are used and the explanation is omitted.

[0036] As in the optical molding apparatus of the first embodiment, in a molding tank 11 in which a photocurable resin 1 is stored, The platform 12 and the partition wall 13 cooperate to accommodate the shaped object 2 having the hardened layer 2a laminated thereon. A space (airtight space) 3 is provided between the lower surface 3A of the space 3 and the light transmitting plate 14. In the configuration in which the photocurable resin layer 1a is formed to a predetermined thickness T corresponding to the number of layers, the shaped object 2 can be precisely formed. For example, the lower surface 13A of the partition wall 13 that forms the space 3 and the hardened structure When a difference in height occurs in the lower surface 2A of the molded object 2, the hardened molded object 2 and the photo-curable resin layer 1a It is anticipated that this will result in problems such as poor molding.

[0037] Therefore, in the second embodiment, the optical molding apparatus 110 has a molding tank 1 as shown in FIG. 1, a platform 12, a partition wall 13, a light irradiation unit 20, and an air cylinder (air supply / exhaust unit) 50 and a control unit 130. The control unit 130 also includes a lift control unit 31 and an irradiation control unit The air intake / exhaust control unit 133 is provided.

[0038] The air cylinder 50 is connected to the platform 12 and the partition wall 13 through a hose 51. The air cylinder 50 is, for example, a cylindrical cylinder body having a piston therein. The air supply / exhaust control section 133 is, for example, a liquid of the photo-curable resin layer 1a on the inside of the partition wall 13. By monitoring the position of the surface and varying the position of the piston in the axial direction depending on the results, The gas in the cylinder is introduced into the space 3 and discharged from the space 3. 33 is a part where the liquid surface of the photocurable resin layer 1a is raised to the lower surface 2 of the object 2 by the operation of the air cylinder 50. Make contact with A.

[0039] Next, a method for manufacturing a molded object according to the second embodiment will be described. As described above, the operation of the lift control unit 31 and the irradiation control unit 32 The photo-curable resin layer 1a and the cured layer 2a are alternately formed to form the n-th layer (n is The object 2 is formed by stacking the (n+1)th hardened layer 2a on the (n+1)th hardened layer 2a.

[0040] Here, between the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 and the light-transmitting plate 14 When the photocurable resin layer 1a having a predetermined thickness T is formed, as shown in FIG. 3 operates the air cylinder 50. That is, the air supply / exhaust control unit 133 The liquid level of the layer 1a is monitored by a sensor or the like, and the gas in the space 3 is supplied to a predetermined amount by the air cylinder 50. The liquid level of the photocurable resin layer 1a is slightly raised, and the already cured model 2 is The lower surface 2A and the photocurable resin layer 1a are brought into contact with each other. A predetermined amount of gas is supplied to the space 3 by the cylinder 50, and the thickness of the photocurable resin layer 1a is set to a predetermined thickness. In this case, the photocurable resin layer 1a is already cured due to the surface tension. The lower surface 2A of the object 2 is kept in contact with the lower surface 2A.

[0041] Therefore, when the irradiation control unit 32 is operated in this state to form a new hardened layer 2a, Even if there is a problem, since the hardened layer 2a is laminated to form the object 2, it is possible to suppress molding defects and achieve precision. Therefore, a high-quality molded object 2 can be formed.

[0042] As described above, the optical molding apparatus 110 according to the second embodiment stores the photocurable resin 1 and has a photosensitive layer on the bottom surface. A modeling tank 11 provided with a light-transmitting plate 14, and a photo-curable resin A light irradiation unit 20 that irradiates light L to harden the molding tank 1 is disposed opposite the light transmission plate 14. 1, and holds a shaped object 2 formed by laminating hardened layers 2a irradiated with light L. A platform 12 is provided, and the platform 12 is movable up and down. and is disposed outside the platform 12 via an airtight member 17. A partition wall 13 cooperates with the wall 12 to form an airtight space 3, and a gas supply or exhaust valve for supplying or discharging gas to the space 3. and an air cylinder 50 for lifting and lowering the platform 12 and the partition wall 13. A predetermined thickness T is provided between the lower surface 13A of the wall 13 and the lower surface 3A of the space 3 and the light-transmitting plate 14. The lifting control unit 31 forms the photo-curable resin layer 1a, and the air cylinder 50 operates to lift the photo-curable resin layer 1a. an air supply / exhaust control unit 133 that brings the liquid surface of the chemically convertible resin layer 1a into contact with the lower surface 2A of the object 2; The light L corresponding to the cross-sectional shape of the predetermined height of 2 is irradiated from the light irradiating unit 20 onto the photocurable resin layer 1a. and an irradiation control unit 32 that irradiates the light to form the cured layer 2a.

[0043] According to this configuration, the lower surface 13A of the partition wall 13 and the lower surface 3A of the space 3 are connected to the light-transmitting plate 1 A photocurable resin layer 1a having a predetermined thickness T is formed between the photocurable resin layer 1a and the substrate 4, and the photocurable resin layer 1a is formed into a predetermined shape. Since the hardened layer 2a is hardened in a uniform shape, the thickness of the hardened layer 2a can be precisely formed, and the molded object can be precisely formed. In addition, with this configuration, the hardened layer 2 previously formed can be molded with high precision. Since a space 3 can be provided around the a, the light irradiated through the light transmitting plate 14 L can prevent the problem of curing the excess light-curable resin 1, and the molded object 2 can be accurately produced. Furthermore, with this configuration, the platform 12 and the partition wall 13 can be easily molded. The air cylinder 50 for supplying and discharging gas into the partitioned space 3 is provided, so that the photocurable resin layer 1 a) to adjust the liquid level of the photocurable resin layer 1a and the bottom surface 2A of the already cured object 2. Therefore, it is possible to suppress molding defects and form the molded object 2 with high precision. can.

[0044] The lift control unit 31, the air intake / exhaust control unit 133, and the irradiation control unit 32 are The formation of the photocurable resin layer 1a, the contact between the liquid surface of the photocurable resin layer 1a and the lower surface 2A of the shaped object 2, and the formation of the cured layer 2a By repeatedly performing the above steps, the molding defects are reduced and the molded object 2 is molded with high accuracy. It is possible. [Third embodiment] Next, a stereolithography apparatus according to a third embodiment will be described. 1 is a schematic diagram showing the basic configuration of such a photo-fabrication apparatus. The same reference numerals are used and the explanation is omitted.

[0045] In the optical molding apparatus according to the first and second embodiments, the photocurable resin 1 is stored in the molding tank 11. The platform 12 and the partition wall 13 cooperate to accommodate the shaped object 2 having the hardened layer 2a laminated thereon. A space (airtight space) 3 is provided between the lower surface 3A of the space 3 and the light transmitting plate 14. The photocurable resin layer 1a is formed to a predetermined thickness T corresponding to the thickness of the layer. Each time the hardened layer 2a is formed, the partition wall 13 is lowered by a predetermined thickness T relative to the platform 12. In this case, the predetermined thickness T is set to, for example, about several μm, It is anticipated that a precise lifting mechanism will be required.

[0046] Therefore, in the third embodiment, the optical molding apparatus 210 has a molding tank 1 as shown in FIG. 1, a platform 12, a light irradiation unit 20, and a control unit 230. 230 includes an elevation control unit 231 and an irradiation control unit 232.

[0047] In the third embodiment, the optical shaping apparatus 210 has the following configuration instead of providing a partition wall. A cylindrical partition wall 213 is formed around the object 2 on the platform 12 together with the object 2. The platform 12 cooperates with the molded partition wall 213 to separate the space (air). Forms a dense space)3.

[0048] The lift control unit 231 controls the operation of the platform lift mechanism 15. The elevation control section 231 controls the height position of the platform 12. By raising and lowering the platform 12, the bottom surface of the partition wall 213 and the lower surface of the space 3 can be connected to the light. A photocurable resin layer having a predetermined thickness is formed between the light-transmitting plate 14 and the light-transmitting plate 14 .

[0049] The irradiation control unit 232 may, for example, adjust the height of the object 2 at predetermined intervals based on the three-dimensional shape data. and a light irradiation pattern showing the cross-sectional shape of the partition wall 213, and The irradiation control unit 232 controls the object 2 and the photocurable resin to irradiate the light. The light corresponding to each cross-sectional shape at a predetermined height position of the partition wall 213 is guided to the lower surface of the space 3 and the light-transmitting surface. By irradiating the photo-curable resin layer between the overplate 14, a cured layer of a predetermined thickness is formed. It is possible.

[0050] Next, a method for manufacturing a shaped object according to a third embodiment will be described with reference to FIGS. 10 to 14. These figures show a part of the optical shaping apparatus 10 shown in FIG. As shown in FIG. 10, the lifting control unit 231 lifts the photocurable resin 1 from the modeling tank 11 in which the photocurable resin 1 is stored. The elevated platform 12 is lowered into the molding tank 11, and the underside of the platform 12 The surface 12A is disposed at a position where a predetermined distance T is between the surface 12A and the light-transmitting plate 14. Between the platform 12 and the light-transmitting plate 14, a predetermined distance T and a light-transmitting plate of the same predetermined thickness T are provided. A curable resin layer 1a is formed.

[0051] Next, the irradiation control unit 232 selects the object 2 to be molded and a cylindrical object capable of containing the object 2. Based on the three-dimensional shape data of the partition wall 213, the shaped object 2 and the partition wall 213 at a predetermined height are and calculates an irradiation pattern that indicates a cross-sectional shape of the first layer of the object 2 and the partition wall 213. The light L corresponding to the light-curable resin layer 1a is irradiated through the light-transmitting plate 14. As a result, the photocurable resin layer 1a has the same cross-sectional shape as the first layer of the shaped object 2 and the partition wall 213. Therefore, as shown in FIG. 11, the platform 12 is provided with the object 2 and Hardened layers 2a and 213a having a predetermined thickness T, which will become the first layers of the partition walls 213, are respectively held.

[0052] Next, the lift control unit 231 raises the platform 12 as shown in FIG. , and is temporarily placed at a position higher than the modeling tank 11. Here, the hardened layer 2a of the model 2 and the partition wall 2 The 13 hardened layers 213a are molded to the same height with a predetermined thickness T. The lower surface 2aA of the hardened layer 2a of the object 2 and the lower surface 213aA of the hardened layer 213a of the partition wall 213 are flush with each other. At the same time, the platform 12 and the partition wall 2 are provided around the shaped object 2 (hardened layer 2a). A space (airtight space) 3 is formed, partitioned by 13 (hardened layer 213a).

[0053] Next, the lifting control unit 231 moves the platform 12 into the modeling tank 11 and below the partition wall 213. The surface 213A is lowered vertically until the distance between the surface 213A and the light transmitting plate 14 becomes a predetermined distance T. In this case, the space 3 partitioned by the platform 12 and the partition wall 213 becomes an airtight space, As shown in FIG. 13, a predetermined uniform thickness T The photocurable resin layer 1a is formed.

[0054] Next, the irradiation control unit 232 determines the cross-sectional shape of the second layer of the object 2 and the partition wall 213. The light L is irradiated onto the photocurable resin layer 1a through the light transmitting plate 14. As shown in FIG. 14, the curable resin layer 1a is cured to have the same cross-sectional shape as the second layer, and has a predetermined thickness. The second layer of the laminate T is laminated on the first layer to form the hardened layer 2a, 213a. In the embodiment, the lower surface 213aA of the partition wall 213 and the space 3 are molded together with the shaped object 2. A photocurable resin layer 1a having a predetermined thickness T is formed between the lower surface 3A and the light-transmitting plate 14. The photocurable resin layer 1a is cured into a predetermined shape. The thickness of the hardened layers 2a and 213a can be precisely formed, and the shaped object 2 can be precisely formed. In this embodiment, the hardened layer 2a can be easily molded. Since the gap 3 can be provided, the light L irradiated through the light transmitting plate 14 can be filtered out. This can prevent problems caused by hardening the hardening resin 1. Separately provide a partition around the platform 12 to mold the partition 213 together with the object 2. This eliminates the need for a separate laser beam forming unit, and the configuration of the optical shaping device 210 can be simplified.

[0055] The elevation control unit 231 and the irradiation control unit 232 control the formation of the photocurable resin layer 1a and the manufacturing The formation of the hardened layers 2a and 213a of the molded object 2 and the partition wall 213 is alternately performed to form the nth layer ( The (n+1)th hardened layer 2a, 213a is laminated on the first hardened layer 2a, 213a (n is a natural number). In this way, the shaped object 2 and the partition wall 213 can be formed.

[0056] As described above, the optical molding apparatus 210 according to the third embodiment stores the photocurable resin 1 and has a photosensitive layer on the bottom surface. A modeling tank 11 provided with a light-transmitting plate 14, and a photo-curable resin A light irradiation unit 20 that irradiates light L to harden the molding tank 1 is disposed opposite the light transmission plate 14. 1, and by irradiating light L, the periphery of the object 2 together with the object 2. The cylindrical partition wall 213 is formed around the periphery of the casing 211, and cooperates with the partition wall 213 to form an airtight space 3. The platform 12 is raised and lowered, and the underside 213A of the partition wall 213 and A photocurable resin layer 1a having a predetermined thickness T is formed between the lower surface 3A of the space 3 and the light transmitting plate 14. The elevation control section 231 to be formed, and the cross-sectional shape of the object 2 and the partition wall 213 at a predetermined height The light L corresponding to the cured layers 2a and 2b is irradiated onto the photocurable resin layer 1a from the light irradiating unit 20. and an irradiation control unit 232 forming the irradiation control unit 13a.

[0057] According to this configuration, the lower surface 213aA of the partition wall 213 and the cavity 213b are molded together with the shaped object 2. A photocurable resin layer 1a having a predetermined thickness T is formed between the lower surface 3A of the gap 3 and the light transmitting plate 14. The photocurable resin layer 1a is then cured into a predetermined shape. The thickness of each of the hardened layers 2a and 213a can be precisely formed. In this embodiment, the periphery of the hardened layer 2a previously formed can be precisely molded. Since a space 3 can be provided in the surrounding area, the light L irradiated through the light transmitting plate 14 can be This can prevent the problem of excessive curing of the photocurable resin 1. In order to form the partition wall 213 together with the object 2, the partition wall is separately formed around the platform 12. This eliminates the need for providing a laser beam forming unit, and the configuration of the optical shaping device 210 can be simplified.

[0058] In addition, the lifting control section 231 lifts the platform every time the formation of the hardened layer 2a, 213a is completed. In order to raise the mold 12 to above the photocurable resin 1, Gas is introduced inside the partition wall 213, forming an airtight space. The thickness of the hardened layers 2a and 213a can be precisely formed, and the shaped object 2 can be precisely formed. It can be easily molded.

[0059] The elevation control unit 231 and the irradiation control unit 232 control the formation of the photocurable resin layer 1a and the curing The formation of the hardened layers 2a, 213a is alternately performed, and the platform 12 is provided with a plurality of hardened layers 2a, 213a. 213a are laminated to form the object 2 and the partition wall 213. The device configuration of the molding machine 0 can be simplified while molding the molded object 2 with high accuracy.

[0060] In addition, the lower surface 2A of the shaped object 2 and the lower surface 213A of the partition wall 213 are always flush with each other. Therefore, a highly accurate shaped object 2 can be easily formed. [Fourth embodiment] Next, a stereolithography apparatus according to a fourth embodiment will be described. FIG. 16 is a schematic diagram showing the basic configuration of such a photo-fabrication apparatus according to the fourth embodiment. 10 is a diagram for explaining the operation of the suction mechanism of the forming device. The same reference numerals are used and the explanations are omitted.

[0061] As in the optical molding apparatuses of the first and second embodiments, a molding tank 1 storing a photocurable resin 1 is provided. The platform 12 and the partition wall 13 cooperate to form the molded object 2 having the hardened layer 2a stacked thereon. A space (airtight space) 3 is provided for accommodating the light, and a light transmitting plate 14 is provided between the lower surface 3A of the space 3 and the light transmitting plate 14. In the case of forming a photocurable resin layer 1a having a predetermined thickness T corresponding to one layer, the object 2 can be precisely formed. However, for example, if an uncured or semi-cured photocurable resin is applied to the previously cured object 2, If any photocurable resin remains, the remaining uncured photocurable resin may be damaged when the next cured layer is cured. It is anticipated that the grease itself will harden, making it impossible to create shapes with high precision.

[0062] Therefore, in the fourth embodiment, the optical molding apparatus 310 has a molding tank as shown in FIG. 11, a platform 12, a light irradiation unit 20, a suction mechanism 60, and a control unit 330. The control unit 330 also includes an elevation control unit 231, an irradiation control unit 232, and a suction control unit 333. 33 and equipped.

[0063] The suction mechanism 60 generates negative pressure to remove uncured photo-curable material adhering to the shaped object 2. The suction mechanism 60 is configured to suck and remove the chemically reactive resin. The open dish portion 61 is connected to the dish portion 61 via a hose 63, and a negative pressure is applied to the dish portion 61. and a moving mechanism 64 for moving the dish portion 61 in, for example, a horizontal direction. do.

[0064] In the fourth embodiment, similarly to the third embodiment, the optical shaping apparatus 310 has the following configuration: Instead of providing a partition wall, a cylinder is provided around the object 2 on the platform 12 together with the object 2. The platform 12 is configured to form a partition wall 313 having a shape similar to that of the partition wall 313. 13 to form the space (airtight space) 3. The partition wall 313 is integral with the shaped object 2. The procedure for forming the shaped object 2 and the partition wall 313 is the same as that of the third embodiment. The partition wall 313 is the same as that described in . Note that the partition wall 313 is integral with the target object 2. Therefore, the partition wall 313 must be finally separated from the model 2.

[0065] On the other hand, the dish portion 61 of the suction mechanism 60 is formed to have the same size as the partition wall 313 described above. As shown at 16, a suction mechanism 60 is positioned below the platform 12. When the platform 12 is lowered, the partition wall 313 is sandwiched between the platform 12 and the dish portion 61. As described above, the partition wall 313 is molded integrally with the shaped object 2, and therefore the shaped object 2 , is supported by the platform 12 and the dish portion 61 via the partition wall 313. The element 313 also functions as a support for supporting the object 2 .

[0066] In addition, in this configuration, when the partition wall 313 is sandwiched between the platform 12 and the dish portion 61, The edge of the dish portion 61 comes into contact with the lower surface (bottom surface) 313A of the partition wall 313 to form a closed space. Therefore, when the suction unit 62 is operated, the inside of this closed space can be made negative pressure, and the shaped object 2 The adhered uncured photocurable resin 70 can be easily removed by suction.

[0067] As described above, the optical molding apparatus 310 according to the fourth embodiment stores the photocurable resin 1 and has a photosensitive drum 312 on the bottom surface. A modeling tank 11 provided with a light-transmitting plate 14, and a photo-curable resin A light irradiation unit 20 that irradiates light L to harden the molding tank 1 is disposed opposite the light transmission plate 14. 1, and by irradiating light L, the periphery of the object 2 together with the object 2. The cylindrical partition wall 313 is formed around the periphery of the casing 3, and cooperates with the partition wall 313 to form an airtight space 3. The uncured photocurable resin 70 adhering to the platform 12 and the model 2 is removed by suction. The suction mechanism 60 raises and lowers the platform 12, and the bottom surface 313A of the partition wall 313 and A photocurable resin layer 1a having a predetermined thickness T is formed between the lower surface 3A of the space 3 and the light-transmitting plate 14. and a lifting control section 231 for controlling the cross-sectional shape of the object 2 and the partition wall 313 at a predetermined height. The light L corresponding to the cured resin layer 1a is irradiated from the light irradiating unit 20 to form an integrated cured layer. When the platform 12 is positioned above the photocurable resin 1, the irradiation control unit 232 A suction control unit 333 is disposed below the platform 12 and activates the suction mechanism 60. can.

[0068] According to this configuration, the lower surface 313A of the partition wall 313 and the lower surface 3A of the space 3 are connected to the light-transmitting plate. A photocurable resin layer 1a having a predetermined thickness T is formed between the substrate 1 and the base 14. In order to harden the molded object 2 and the partition wall 313 into a fixed shape, the thickness of each hardened layer must be precisely formed. This allows the molded object 2 to be molded with high precision. In this case, a space 3 can be provided around the hardened layer of the previously molded object 2, so that the light can pass through the space 3. The problem of the light L irradiated through the filter plate 14 curing the excess photo-curable resin 1 is prevented. This allows the molded object 2 to be formed with high precision. When the photo-curable resin 12 is positioned above the platform 12, the molding The suction mechanism 60 is activated to suck and remove the uncured photocurable resin 70 adhering to the object 2. Therefore, the uncured photocurable resin 70 attached to the model 2 is prevented from being cured separately. The shaped object 2 can be formed with high precision.

[0069] The partition wall 313 is molded integrally with the shaped object 2, and is configured to allow the suction mechanism 60 to The plate portion 61 of the mold 10 is sandwiched between the plate portion 61 and the platform 12, and functions as a support for the molded object 2. Therefore, the suction operation is performed at least during which the suction object 2 does not come off the platform 12. This can easily prevent the above.

[0070] The suction mechanism 60 has a dish portion 61 with an open top, and the dish portion 61 is connected to the bottom surface 3 of the partition wall 313. 13A to form a closed space, and when the suction part 62 is operated, the inside of this closed space is negatively charged. The pressure can be increased, and the uncured photocurable resin 70 adhering to the model 2 can be easily sucked and removed. can be removed.

[0071] The lifting control unit 231, the irradiation control unit 232, and the suction control unit 333 are configured to The formation of the layer 1a, the formation of the cured layer, and the suction of the uncured photocurable resin 70 are repeatedly performed. In order to form the object 2 and the partition wall 313 by stacking a plurality of hardening layers on the platform 12, Therefore, the optical molding apparatus 310 can be simplified in configuration and can mold the object 2 with high precision. Cut.

[0072] The optical shaping apparatus and the method for manufacturing a shaped object according to the present invention have been described above. The present invention may be embodied in various different forms other than the above-described embodiments. For example, the chamber 40 in the first embodiment may be The pressure adjusting unit 41 and the chamber internal pressure control unit 33 are the same as those of the optical shaping apparatuses according to the second to fourth embodiments. The air cylinder 50 and the air supply / exhaust control unit 13 in the second embodiment may be combined with the air cylinder 50 and the air supply / exhaust control unit 13 in the second embodiment. 3 may be combined with the optical shaping apparatus according to the first embodiment, the third embodiment, and the fourth embodiment. In addition, the suction mechanism 60 and the suction control unit 333 in the fourth embodiment may be the same as those in the first to third embodiments. It may be combined with the optical shaping apparatus according to the embodiment.

[0073] Furthermore, the components of the illustrated optical shaping apparatus are conceptual and functional, and are not necessarily physical. In other words, the specific configuration of each device may differ from that shown in the drawings. It is not limited to this, but all or part of it may be used in any unit depending on the processing load and usage status of each device. The components may be functionally or physically distributed or integrated at different locations.

[0074] The control unit of the optical shaping apparatus is configured, for example, as software, by executing a program loaded into a memory. In the above embodiment, the hardware or software is These functions are explained as functional blocks that are realized by the cooperation of software. Functional blocks may consist of hardware only, software only, or a combination of both. This can be realized in various ways depending on the combination. [Explanation of symbols]

[0075] 1 Photocurable resin 1a Photocurable resin layer 2 Three-dimensional objects (modeled objects) 2a hardened layer 3. Space (airtight space) 3A Bottom 10, 110, 210, 310 stereolithography equipment 11 Modeling tank 12 Platform 13, 213, 313 Bulkhead 13A, 213A, 313A Lower surface (bottom surface) 14 Light-transmitting plate (light-transmitting part) 15 Platform lifting mechanism 16 Bulkhead lifting mechanism 17 Airtight materials 20 Light irradiation unit 21 Light source 22 Image forming element 23 Reflective mirror 24 Projection lens 30, 130, 230, 330 Control unit 31, 231 Lift control section 32, 232 Irradiation control unit 33 Chamber internal pressure control unit 40 Chamber 41 Chamber internal pressure adjustment unit 50 Air cylinder (intake and exhaust section) 60 Suction mechanism 61 Dish section 62 Suction part 63 Hose 64 Moving mechanism 70 Uncured photocurable resin 133 Air intake and exhaust control unit 333 Suction control unit

Claims

1. a modeling tank that stores a photocurable resin and has a light-transmitting portion on its bottom surface; a light irradiation unit that irradiates light that cures the photocurable resin through the light transmission unit; The light transmitting portion is opposed to the light transmitting portion, and is movable up and down relative to the modeling tank. a platform that holds a cylindrical partition wall formed by the above-mentioned steps and forms an airtight space in cooperation with the partition wall; The platform is raised and lowered to contact the bottom surface of the partition wall, the lower surface of the airtight space, and the light-transmitting a lifting control section for forming a photocurable resin layer with a predetermined thickness between the lifting control section and the overlying section; an irradiation control unit that irradiates the photocurable resin layer with the light corresponding to a cross-sectional shape of the partition wall at a predetermined height from the light irradiation unit to form a cured layer; A photolithography apparatus comprising:

2. an air supply / exhaust unit that supplies or exhausts gas to or from the airtight space; The optical shaping apparatus of claim 1 further comprising:

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