JPH0655643A - Manufacture of light molded form and device therefor - Google Patents

Abstract

PURPOSE:To manufacture, in a short time and efficiently, a high quality product closely following a design with excellent dimensional precision containing only a little cells by moving a resin supply mechanism consisting of a container and a doctor blade from one end to other end of a bathtub so as to form a resin layer having a fixed thickness on a top surface of a photo-curing resin layer. CONSTITUTION:A liquid photosensitive resin 9 is housed in a bathtub 3. An up-and-down molding stage 5 is dipped in the resin liquid 9 so as to form a thin resin liquid layer at upper part. A free surface 4 of the resin liquid is irradiated selectively with an active light 6 so as to form a photo-curing layer. Here, a resin supply mechanism 1 consisting of a container and a doctor blade 2 is moved on the bathtub 3, whose top end face of the outer peripheral wall is kept in the same horizontal face, from one end to other end thereof. The liquid photosensitive resin is supplied on the photo-curing layer from the container. At the same time, the free surface 4 of the resin liquid is regulated to be the top end face of the outer peripheral wall of the bathtub by the doctor blade 2 which moves following the container so as to obtain a liquid photosensitive resin layer having a fixed thickness as a next photo-curing layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention directly uses shape data of a three-dimensional model designed by CAD or the like to selectively irradiate a free surface of a liquid photosensitive resin with an actinic ray to evaluate the appearance of industrial products, a presentation model, The present invention relates to a method and an apparatus for manufacturing an optical modeled object such as a mechanical part model and a master model.

[0002]

2. Description of the Related Art In the production of stereolithography, a liquid photosensitive resin is contained in a bath, and a high energy actinic ray such as a laser is two-dimensionally scanned on a free surface formed by the resin liquid in the bath. The desired cross-sectional shape of the light-molded article is photo-cured, and then the molding frame is moved downward to newly introduce a resin solution from the surroundings onto the upper surface of the photo-curable resin layer, and optical scanning is performed again to the photo-curable resin layer A method is used in which the operation of molding a photo-curable resin layer having a continuous cross-sectional shape is repeated to form a plurality of photo-molded articles having a predetermined cross-sectional shape. In the case of producing a stereolithography product by the above method, by simply curing the molding frame by one layer and waiting for the resin liquid to naturally flow into the upper surface of the photocurable resin layer from the surroundings to form a uniform and smooth liquid surface. It takes a very long time to manufacture a stereolithography object. Therefore, when the resin liquid is actually introduced into each photo-curable resin layer, after the photo-curable resin layer is molded, the molding cradle is once lowered largely by about 10 to 50 mm to sink the optical molded article being molded into the resin liquid, After fully immersing the upper surface of the cured resin layer in the surrounding resin liquid, raise the molding frame again until the immersion depth from the resin surface to the upper surface of the photocurable resin layer reaches a predetermined depth of about 0.1 to 0.5 mm. It has been carried out by this (hereinafter referred to as the overdeep method).
However, the viscosity of the photosensitive resin at room temperature is 5 to 200.
Since the poise is high, the fluidity is poor, and the viscosity tends to increase as the physical properties such as strength are increased. As described above, the immersion depth is extremely shallow and the photo-curable resin layer has a wide curing area such as full-scale curing. In this case, it takes a lot of time for the surface of the resin liquid introduced into the upper surface of the photo-curing resin layer to rise up while the molding table is raised again and the molding table is held at a predetermined depth. ing. Further, since the molding cradle is largely lowered, it is easy to entrap air bubbles in the resin liquid introduced onto the upper surface of the photo-curing resin layer, and when the air bubbles enter the stereolithography product, irregularities are generated on the surface of the photofabrication product or local parts. Physical properties are deteriorated. Furthermore, in the production of a cantilevered stereolithography product, a large vertical movement of the molding frame causes stress to be concentrated on a portion of the stereolithography product, which causes deformation of the stereolithography product and design. It is difficult to make a faithful three-dimensional object. To address these problems, Japanese Patent Laid-Open No. 61-114818 has been proposed, in which a doctor having a width corresponding to the width of the bath provided in the bath is provided after the photosensitive resin is supplied into the bath. By moving, the supplied resin is smoothed to a constant thickness. (Hereafter called the doctor squeegee method).

[0003]

As described above, in the method for producing a stereolithographic object by the overdip method, it takes a long time to introduce the resin liquid from the periphery to the upper surface of the photocurable resin layer and to uniformly smooth the resin liquid surface. Therefore, there is a problem that it takes a long time to manufacture the stereolithography product, and the cantilever shape or the like deforms to limit the three-dimensional shape of the stereolithography product that can be faithfully manufactured. A doctor squeegee method has been proposed to solve the above-mentioned problem, but since this method provides the entire amount of resin liquid for one layer at the doctor's movement start position, the amount of resin liquid squeegeeed by the doctor as the doctor moves is reduced. It is gradually less and it is difficult to obtain a uniform thickness from the start position to the entire end stop position. In an extreme case, depending on the amount of resin supply, the resin may run short at the end and the desired photocurable resin layer can be obtained. It may not be. In addition, since the resin liquid stays in the periphery of the bathtub, the resin liquid surface fluctuates during the selective irradiation of actinic rays, and the peripheral edge of the photo-curing resin layer becomes thick, which may adversely affect the overall dimensional accuracy of the optical molding. is there.
Also, when attempting to manufacture a high-profile stereolithography object, the resin supply device is installed at a position apart from the resin liquid level in the bathtub, so the fall distance of the resin liquid supplied from the resin supply device becomes long and It was difficult to manufacture a high-quality stereolithography product because there was a high possibility that the amount of bubbles entrapped at the resin liquid interface and the bubbles were diffused by the doctor squeegee and the bubbles were mixed in the photocurable resin layer. The present invention solves the above-mentioned problems in the supply of resin liquid and uniform smoothing, and is capable of efficiently producing a high-quality stereolithography product that is faithful to the design, has good dimensional accuracy, and has very few bubbles mixed in. It is an object of the present invention to provide a method of manufacturing a modeled object and a manufacturing apparatus.

[0004]

SUMMARY OF THE INVENTION The present invention provides the following method and apparatus for producing a stereolithographic object in order to achieve the above objects. That is, the liquid photosensitive resin is housed in a bath, and a mold base that can be raised and lowered is immersed in the resin liquid so as to form a thin resin liquid layer above, and the free surface of the resin liquid is selectively irradiated with actinic rays. To form a photo-curing layer, then lower the molding frame by a certain distance to supply a new liquid photosensitive resin on the curing layer, and selectively irradiate the surface of the resin with an actinic ray to selectively cure the next photo-curing layer. In the method for producing a stereolithography product, in which a desired stereolithography product is obtained by stacking a plurality of photocurable layers on the molding base, a resin supply mechanism including a container and a doctor blade is provided on the outer peripheral wall. With a doctor blade that moves on the bathtub whose end faces are held in the same horizontal plane from one end to the other end of the bathtub to supply the liquid photosensitive resin on the photocurable layer from the container and move to the container. Freedom of the resin liquid A method for producing a stereolithography object, characterized in that a liquid photosensitive resin layer having a constant thickness to be a next photocurable layer is obtained by regulating the surface to the upper end surface of the outer peripheral wall of the bathtub. The present invention provides an apparatus for manufacturing a stereolithography object such as the above. That is, a bath containing a liquid photosensitive resin and provided with a molding stand capable of moving up and down in the resin solution, a thin resin solution layer on the molding stand, and a resin solution supplied on the photo-curing layer And an active light source that selectively irradiates an actinic ray to form a photocurable layer, and in a manufacturing apparatus for a stereolithography object capable of stacking and forming a plurality of photocurable layers on the molding frame, the upper end surface of the outer peripheral wall is the same horizontal plane. A resin supply mechanism including a container and a doctor blade that can move from one end to the other end of the bathtub held therein is provided, and the doctor blade has a lower end surface having a predetermined height gap with the upper end surface of the outer peripheral wall of the bathtub. This is a device for manufacturing a stereolithographic product, which can be set, and the container is positioned on one end of the outer circumference of the bath except when the resin is supplied, and the doctor blade is positioned further outside the bath than the container.

The following is a specific embodiment of the resin supply mechanism. That is, the container and the doctor blade are arranged in parallel along the long side direction of the bathtub with a certain distance, and the opening surface of the container for containing the liquid photosensitive resin is at a predetermined angle in the opposite direction to the doctor blade. In addition to having a function that allows the opening of the container to be translated from one end of the bathtub to the other end in the direction in which the container falls, the container can also be tumbled on both sides and is separate from the container. There are those in which a doctor blade is formed, and those in which a doctor blade is connected to the outside of the container continuously with the opening surface along the long side of the opening of the container. In addition to the above, one of the long side surfaces of the container of the resin supply mechanism is configured with a doctor blade, and the lower surface of the container can be opened and closed, and the container of the resin supply mechanism has the doctor blade in the center. Some are provided on both sides of. Then, as the entire apparatus, it is possible to dispose a tray on the outer peripheral portion of the bath, and to provide a supply nozzle of the liquid photosensitive resin above the opening surface of the container of the resin supply mechanism.

[0006]

[Function] A thin resin liquid layer is formed on the molding base immersed in the resin liquid in the bathtub, and the free surface of the resin liquid is selectively irradiated with actinic rays to form a photocurable layer, and then the molding base is fixed. Repeat the operation of lowering the distance, supplying a new liquid photosensitive resin on the formed photo-curing layer, and selectively irradiating the surface of the resin with actinic rays to form the next curing layer. In what obtains a predetermined stereolithography object by stacking a plurality of photo-curing layers, a container and a doctor blade are moved from one end to the other end of the bath to supply a liquid photosensitive resin on the photo-curing layer from the container, In addition, a liquid photosensitive resin layer having a constant thickness is formed with a doctor blade.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description will be given based on an embodiment shown in the drawings, but a method will also be described together with an apparatus. According to the present invention, a liquid photosensitive resin is contained in a bath, a movable pedestal is provided in the photosensitive resin liquid, and the molding pedestal is immersed in the resin liquid so as to form a thin resin layer above it. Selectively irradiating the free surface of the photosensitive resin liquid with actinic rays to form a photocurable layer,
Next, the molding frame is lowered from the surface of the photosensitive resin by a certain distance, new liquid photosensitive resin is supplied to the upper surface of the photo-curing layer, and active light rays are selectively irradiated again on the surface of the photosensitive resin to form the next-photo-curing layer. The above operation is repeated to stack and form a plurality of photocurable layers on a molding stand to manufacture a desired stereolithography product, and the one shown in FIG. 1 has a resin recovery tray disposed on the outer peripheral portion of the bath. It is shown that a resin supply mechanism composed of a container and a doctor blade is provided above the bathtub, and the lower part of the container can be opened and closed, and the container and the doctor blade are arranged in parallel along the long side direction of the bathtub. Are located at a certain distance from each other.

In FIG. 1, reference numeral 1 is a horizontally reciprocating photosensitive resin supply mechanism, 1a is an opening / closing piece of a resin container which is part of the resin supply mechanism and which can be opened / closed, and 2 is horizontally reciprocating like 1 Possible doctor mechanism, 3 is a bath for holding the photosensitive resin liquid in which the upper end surface of the outer peripheral wall is horizontal, 4 is the photosensitive resin liquid in the bath, 5 is a molding stand, 6 is an optical fiber or lens system capable of planar scanning , A high energy light beam such as a laser beam, a photosensitive resin injection nozzle 8
Is a photosensitive resin liquid in the resin storage container, and 10 is a resin recovery tray. The lower end of the resin supply mechanism 1 is installed within 50 mm above the upper end surface of the outer peripheral wall of the bathtub 3, preferably about 5 mm, and moves horizontally back and forth simultaneously with the doctor mechanism 2. The resin injecting nozzle 8 is provided on one side surface of the bathtub 3 with the resin supplying mechanism 1.
If a liquid-feeding pump or a sealed photosensitive resin tank (not shown) is used, the photosensitive resin tank is placed close to a predetermined stop position of the photosensitive resin tank, and the photosensitive resin liquid is pressurized by compressed air so that the photosensitive resin liquid is injected into the resin injection nozzle 8 The liquid is automatically fed to the resin injection nozzle 8 and the photosensitive resin liquid is replenished to the resin container. If the resin injection nozzle 8 is provided with a plurality of nozzles, the amount of resin supplied is dispersed, so that the resin liquid supplied immediately below the nozzles does not overflow from the resin storage container and smoothly spreads in the width direction, The smoothing time of the liquid surface of the resin is shortened. The doctor mechanism 2 is installed at substantially the same height as the surface of the resin liquid 4 in the bathtub, that is, the upper end surface of the outer peripheral wall of the bathtub 3. This height depends on the viscosity of the resin liquid, the moving speed of the doctor mechanism 2 and the doctor blade. It is necessary to change it slightly depending on the shape of the lower end. Molding a laser beam 7 in a bath while making a three-dimensional shape, which is not shown in the figure, designed by CAD or the like, planarly scan the condensing mechanism 6 based on the pattern signal of the two-dimensional cross-sectional information divided into a plurality of slices. The photocurable resin layer is formed by selectively irradiating the free surface formed by the thin dipping resin liquid above the frame.

Next, the molding frame 5 is lowered to a depth of 0.1 to 0.5 mm corresponding to the thickness, and the resin container of the resin supply mechanism 1 is opened at the lower part in the direction of arrow A to form an opening and gravity. The resin liquid 9 in the resin storage container to the resin liquid 4 in the bath
The resin solution is continuously supplied on the surface in a striped manner in the width direction, and the supply mechanism 1 is horizontally moved at a speed of about 50 mm / sec in the arrow direction B to continuously supply the resin liquid, and the doctor mechanism 2 is supplied. At the same time, the resin liquid supplied to the free liquid surface is forcibly and uniformly regulated in thickness by the lower end of the doctor blade by moving it in the trailing direction. At this time, the excessively supplied resin liquid overflows from the upper end of the outer peripheral wall of the bath 3 and flows into the resin recovery tray 10 for reuse. The resin supply mechanism 1 and the doctor mechanism 2 are stopped at a position C outside the irradiation range of actinic rays, the resin container is closed to stop the supply of the resin liquid, and both mechanisms are moved again in the direction of the arrow D to return to a predetermined position and are in a standby state. Becomes While the resin supply mechanism 1 is on standby, the surface of the resin liquid 4 is selectively irradiated with the laser beam 7 in the same manner as described above to form a photo-curable resin layer, and the resin liquid is supplied to the resin container again.

Although FIG. 1 is as described above, a predetermined amount of photosensitive resin is injected from the resin injection nozzle from the upper opening of the resin supply container, and the resin injection position is outside the selective irradiation range of the active light rays. In other words, it is located outside the range where the stereolithography product is manufactured, and during the resin injection into the resin container, the photosensitive resin liquid surface is selectively irradiated with the actinic ray while the upper end of the bath is filled with the photosensitive resin. After the photo-curable layer is formed, the photo-curable layer is dropped into the bath by one layer. After the photo-curing layer descends, the solidified portion that hardens on the surface of the sinking part has a large flow resistance to the photosensitive resin liquid introduced from the surroundings, and since the depth of descending is shallow, the outer edge of the cured layer Due to the surface tension acting on the portion, the upper surface of the photo-curing layer has a low curved and free liquid surface shape with irregularities. Although the free liquid surface portion becomes a smooth surface when left for a long time, in the present invention, the resin supply mechanism is separated from the resin injection nozzle in a direction orthogonal to the long side direction of the bath immediately after the photocured layer descends. Direction (referred to as feed), and at the same time, the resin liquid stored in the resin storage container of the resin supply mechanism is continuously supplied to the free liquid surface in a stripe shape in the width direction to follow the doctor mechanism. By moving the resin liquid supplied to the free liquid surface at the lower end of the doctor blade to form a smooth resin liquid surface with a uniform thickness, the resin supply mechanism and the doctor mechanism both traverse over the bath and are outside the range of active rays. After stopping at a predetermined position and simultaneously stopping the supply of the resin liquid from the resin supply mechanism, it returns to the original position and stands by. Further, with the movement of the resin supply mechanism, the excessively supplied photosensitive resin overflows from the upper end of the bath, so that it flows into the resin recovery tray provided around the outside of the bath and the resin liquid accumulates in the peripheral portion of the bath to form the resin liquid. It does not change the free surface. Next, while standing by, the next cured layer is formed in the same manner as described above, and the photocured layer is lowered into the bath by the thickness of one layer, and the next photocured layer forming operation is performed.

The photo-cured layer is formed as described above. The lower end surface of the doctor blade of the resin supply mechanism including the container and the doctor blade that can move from one end to the other end of the bath according to the present invention. Can be set to have a gap with the upper edge of the outer peripheral wall of the bathtub, and the resin liquid is squeegeeed by such a doctor blade, so that the upper surface of the photocurable resin layer is uniformly covered with the resin liquid of a uniform thickness. become. Moreover, since the upper end surface of the bathtub is held in the same horizontal plane, the upper end surface of the outer peripheral wall of the bathtub coincides with the free surface formed by the resin liquid in the bathtub, and the mechanism for supplying the resin is free of resin liquid without special measures. It can be placed close to the surface, and the free surface formed by the resin liquid that is selectively irradiated with actinic rays always maintains the same height, so the focus of the light beam is corrected using a complicated optical system. You don't even have to. Further, except when the resin is being supplied, the container is positioned on one end of the outer periphery of the bathtub, and the doctor blade is set further outside the container than the container. A free surface that is horizontal to the periphery is formed, facilitating the formation of a photo-cured layer having a uniform thickness over the entire surface.

The container of the resin supply mechanism shown in FIG. 1 has a bottom surface which can be opened and closed, and the long side surface of the container other than the doctor blade moves in parallel from one end to the other end of the bath in a direction in which the long side surface is the front of the movement. However, as shown in FIG. 6, there is also one in which a doctor blade is connected to the outside continuously with the opening surface along the long side of the opening of the container of the resin supply mechanism,
The opening / closing piece 2a on the side surface of the container is openable / closable in the arrow direction, and a doctor blade (2c) is formed on the other side surface of the container. There is also a container of a resin supply mechanism that can be tumbled on both sides and has doctor blades formed on both sides of the container. FIG. 3 shows this, and the resin can be supplied from the opening by falling in the direction of the arrow, and the container (1
1) Beaks (11a) (11b) are formed on both sides and a doctor blade is separately provided. The one shown in FIG. 2 can be tumbled on one side of the container, and the beak (11a) is formed only in the tumbling direction. Further, FIG. 5 shows that the container of the resin supply mechanism can be tumbled on both sides and has doctor blades on both sides of the container. 11c and 11d are doctor blades of the container (11), which are tumbled in the arrow direction. Then, the resin can be supplied. In FIG. 4, the doctor blade 11c is formed only on one side of the container (11) and falls over in the direction of the arrow.

In FIG. 7, the container of the resin supply mechanism is provided with opening pieces 1a and 1b on both sides centering on the doctor blade 1c. The opening and closing pieces 1a and 1b are the surface of the photosensitive resin liquid 4 in the bath when opening and closing. That is, the doctor blade 1c which also serves as a stopper is installed so as to stop and hold it at substantially the same height as the upper end of the outer peripheral wall of the bathtub 3. This type can supply the resin on both sides of the doctor blade, and it is not necessary to return to a predetermined position for each layer of the photocurable resin layer. That is, since the photosensitive resin for multiple layers is accommodated in the resin supply container, it is possible to suppress the fluctuation of the resin supply amount during the movement of the resin supply mechanism and efficiently manufacture the stereolithography object in a short time.

The height of the doctor blade of the resin supply mechanism must be slightly changed depending on the viscosity of the photosensitive photosensitive resin, the moving speed of the resin supply container, the shape of the opening / closing piece, and the like. The photosensitive resin liquid 9 in the resin supply container is transmitted along the inner wall of the supply container by opening the opening / closing piece (1a) or (1b), and is continuously elongated on the surface of the photosensitive resin liquid 4 in the bathtub in the width direction. By horizontally moving the supplied resin supply mechanism 1 in the direction of arrow B or D shown in FIG. 8 at a rate of about 50 mm / scc, the supplied resin is forcibly made uniform on the lower side of the opening / closing pieces 1a, 1b of the supply container. Regulate to a certain thickness.

At this time, the excess resin liquid 9 is supplied to the bath 3
Overflow from the upper end surface of the outer peripheral wall, and the resin recovery tray 10
It becomes available for reuse. The resin supply mechanism 1 stops at a position E in FIG. 8 outside the laser beam irradiation range and enters a standby state to supply the photosensitive resin to the resin supply container from the resin injection nozzle 8 above the E position. While the resin supply container is on standby, the surface of the resin liquid 4 is selectively irradiated with the laser beam 7 in the same manner as described above to form a photocurable resin layer, and then the molding frame 5 is lowered by the thickness of the next photocuring operation. Move on to. In addition to the above, the resin supply mechanism of the present invention can be modified arbitrarily.

[0016]

As is apparent from the above description, when the manufacturing method and apparatus for stereolithography according to the present invention is used, the upper end surface of the outer peripheral wall of the bath matches the free surface formed by the resin liquid in the bath. , The resin supply mechanism can be placed close to the free surface of the resin liquid without any special measures, and the shortest dropping distance of the resin liquid supplied from the resin supply mechanism is Since it is held for a period of time, the entrapment of air bubbles at the resin liquid interface in the bath is extremely reduced, and it becomes possible to manufacture a high-quality stereolithography product with less air bubbles mixed inside. Further, since the resin supply mechanism moves on the bath while supplying the resin liquid, a doctor who continues while continuously supplying a stable amount of the resin liquid over the entire range from the supply start position to the end stop position. Since the upper surface of the photo-curing resin layer is uniformly covered with the resin liquid having a uniform thickness and the excessively supplied resin liquid overflows from the upper end of the outer peripheral wall surface of the bathtub, the resin liquid in the peripheral portion of the bathtub is There is no longer any stagnation and fluctuations in the free surface formed by the resin liquid, and the problem of thickening around the outer edge of the cured part, which was noticeably observed when the area of the photo-cured resin layer was large, was solved. It has become possible to manufacture excellent stereolithography products. In addition, since the doctor liquid is forcibly smoothed while supplying the resin liquid to the upper surface of the photo-curing resin layer, it is possible to obtain a smooth resin liquid surface with a uniform thickness in a short time. If the device that can be used is used, it is not necessary to return to a predetermined position for each layer, the manufacturing time is further shortened, and the resin liquid can be replenished to the resin supply mechanism during the selective irradiation of the actinic rays, so that the stereolithography can be efficiently performed in a short time. It has become possible to manufacture things. Further, since the free surface formed by the resin liquid that is selectively irradiated with the actinic ray always maintains the same height, it is not necessary to correct the focus of the ray beam by using a complicated optical system.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an apparatus for producing a stereolithographic object of the present invention.

FIG. 2 is an explanatory diagram of an example in which a container of a resin supply mechanism falls down.

FIG. 3 is a similar explanatory diagram different from FIG.

FIG. 4 is an explanatory view of a container of a resin supply mechanism in which a doctor blade is formed.

5 is an explanatory diagram similar to FIG.

FIG. 6 is an explanatory diagram of an example of a resin supply mechanism in which a lower portion of a container is opened and closed.

FIG. 7 is an explanatory view of a container of a resin supply mechanism formed with a doctor blade in the center.

FIG. 8 is an explanatory diagram showing an example of use of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photosensitive resin supply mechanism 1a Opening / closing piece 1b Opening / closing piece 1c Doctor blade 2 Doctor blade 3 Bath 4 Photosensitive resin liquid surface in bath 5 Molding stand 6 Optical condensing means 7 Laser beam 8 Photosensitive resin injection nozzle 9 Resin Photosensitive resin liquid in container 10 Resin recovery tray

Claims (2)

[Claims] 1. A liquid photosensitive resin is housed in a bath, and a mold base that can be moved up and down is immersed in the resin liquid so as to form a thin resin liquid layer above, and actinic rays are applied to the free surface of the resin liquid. To form a photo-curing layer by selective irradiation, then lower the molding frame by a certain distance, supply a new liquid photosensitive resin on the photo-curing layer, and irradiate the liquid surface of the resin again with an actinic ray. By repeating the operation of forming the next light curing layer by stacking a plurality of light curing layers on the molding frame to obtain a desired stereolithography object, in the method for producing a stereolithography object, a resin supply including a container and a doctor blade is provided. The mechanism moves over the bathtub with the upper end surface of the outer peripheral wall held in the same horizontal plane from one end to the other end of the bath to supply the liquid photosensitive resin on the photocurable layer from the container and follow the container. Moving the doctor blade with the moving liquid The method for producing an optical molded article, characterized in that the free surface of the liquid is regulated to the upper end surface of the outer peripheral wall of the bath to obtain a liquid photosensitive resin layer having a constant thickness to be the next photocurable layer. 2. A bath containing a liquid photosensitive resin and provided with a molding stand capable of moving up and down in the resin solution, a thin resin liquid layer on the molding stand, and a photo-curing layer obtained by curing the same. An upper surface of an outer peripheral wall, which is an apparatus for producing an optical model, which comprises an active light source that selectively irradiates a resin liquid with an actinic ray to form a photocurable layer, and can form a plurality of photocurable layers stacked on the molding frame. Is provided with a resin supply mechanism composed of a container and a doctor blade that can move from one end to the other end of a bathtub held in the same horizontal plane, and the doctor blade has a lower end surface having a predetermined height gap with the upper end surface of the outer peripheral wall of the bathtub. The apparatus for manufacturing a stereolithographic object, wherein the container is located on one end of the outer periphery of the bath except when the resin is supplied, and the doctor blade is located further outside the bath than the container.