JP5151319B2 - Stereolithography method - Google Patents

Description

  The present invention relates to an optical modeling method and apparatus for forming a three-dimensional object by sequentially irradiating light to a photocurable composition to form a cured layer and sequentially laminating the cured layer, and in particular, having a fine shape. The present invention relates to an optical modeling method for accurately modeling a three-dimensional object.

  2. Description of the Related Art In recent years, various electronic devices and various devices represented by portable terminals and the like have been strongly demanded to be small and light and to have high performance. For this reason, there is an increasing need for miniaturization of mechanical parts such as screws, gears, motor housings, and springs used in electronic devices. In addition, the design and design configuration of machine parts such as screws and motors used in electronic devices are performed on a computer using CAD or the like. As a method for modeling a three-dimensional object based on such a three-dimensional model designed on a computer, for example, there is an optical layered modeling method (hereinafter referred to as an optical modeling method). Below, an example of the conventional optical modeling method is shown.

  In the conventional optical modeling method, the three-dimensional object to be modeled is modeled based on the data of the cross-sectional group obtained by parallel slicing into a plurality of layers. Usually, first, light is applied to the liquid surface of the photocurable composition in a region corresponding to the lowermost section. Thereby, the photocurable composition of the liquid surface part irradiated with light hardens | cures, and the one-step hardened | cured layer of a three-dimensional shaped object is modeled. Next, an uncured photocurable composition having a predetermined thickness is coated on the surface of the cured layer. At this time, only a predetermined thickness of the cured layer is immersed in the photocurable composition for coating. Then, the surface coated with the photocurable composition is irradiated with a laser beam along a predetermined pattern to cure the coat layer portion. The cured coat layer portion is laminated and integrated with the cured layer formed on the lower side. And the light irradiation and the coating of a photocurable composition are performed to the cross section adjacent to the shape | molded cross section. By repeating this, a desired three-dimensional shaped object is formed (see Patent Documents 1 and 2).

Further, there is a method of using a recoater in order to reduce the amount of the photocurable composition used. In this method, the photocurable composition is again supplied onto the formed cured layer, and the cured layer is further formed by irradiating light to the photocurable composition spread and applied by a recoater. By repeating this process, the cured layers are laminated and integrated.
In such an optical shaping method, lamination is performed in units of μm (micrometer), and the size is also fine. For this reason, particularly when the focus position at the time of exposure is not at a predetermined height, the image plane is blurred and the accuracy is lowered. In order to prevent this, it is necessary to balance the liquid level of the photocurable composition to be applied (the liquid level is kept constant). In order to keep the liquid level at a predetermined height, for example, as disclosed in Patent Document 3, a frame-like object surrounding a desired three-dimensional object is formed, or thixotropy is imparted to the resin liquid. did.
JP 56-144478 A JP-A-62-35966 JP 2006-272917 A

However, although these techniques were very effective, they were not very effective for three-dimensional shaped objects such as shaped objects having some special shapes, such as aggregates of protrusions and discontinuous shaped objects. It wasn't. This is a process of applying a photocurable composition for each lamination and preparing a thin film with a recoater, and photocuring between discontinuous shaped objects in the part where the solid of the shaped object is present in the lower layer and the part where it is not. Since the force due to the flow of the peripheral photocurable composition also acts on the curable composition, the photocurable composition having a necessary height is pushed out, which causes a problem that the film thickness becomes non-uniform.
In the step of forming a desired three-dimensional object, for example, as shown in FIG. 5, the photocurable composition is applied to the desired shape area 21 that forms the desired three-dimensional object, and a cured layer is laminated. At this time, the photocurable composition is not necessarily applied so as to cover the desired shape area 21, and the photocurable composition may not be supplied to a part of the desired shape area 21, as shown in FIG. It was. Thus, the liquid level of the photocurable composition was not uniform, and the film thickness was not uniform with respect to the desired shape area 21. In order to avoid this, when a frame such as that disclosed in Patent Document 1 is made, the shape required when taking out the target object, that is, when removing the frame. In many cases, the post-processing is difficult.

  This invention is made | formed in view of such a situation, selectively irradiates light to a photocurable composition, forms a hardened layer, and supplies a photocurable composition on a hardened layer again. In the optical modeling method for forming a three-dimensional object in which the cured layer is laminated and integrated by repeating the formation of a cured layer by irradiating light to the photocurable composition spread and applied by a recoater. It aims at providing the method of improving the uniformity of the film thickness of the photocurable composition to apply | coat.

  In one aspect of the optical modeling method according to the present invention, a photocurable composition is selectively irradiated with light to form a cured layer, the photocurable composition is again supplied onto the cured layer, and a recoater The photo-curing composition spread and coated with light is further irradiated with light to further form a cured layer, and by repeating this, a stereolithography method for modeling a three-dimensional object in which the cured layer is laminated and integrated, the diameter A plurality of protrusion-shaped objects are arranged at least in a region where a circle locus drawn by moving a 600 μm circle so as to be in contact with the outline of the three-dimensional object is formed around the three-dimensional object. Are formed in a stacked manner. Thereby, it can suppress that a photocurable composition is extruded outside or flows out. In this way, the liquid level of the photocurable composition applied to the three-dimensional object can be balanced.

  Moreover, in one aspect of the optical modeling method according to the present invention, it is preferable that the plurality of protrusion-shaped objects are uniformly arranged over the entire region where the preset protrusion-shaped object is disposed. In addition, it is preferable that the entire region to be disposed surrounds the three-dimensional object with a width that is at least twice as large as the dimension D in the direction orthogonal to the outer circumferential line of the circle locus.

  Furthermore, in one aspect of the optical modeling method according to the present invention, the plurality of protrusion-shaped objects are arranged such that the protrusion-shaped objects are arranged in a direction perpendicular to the outer peripheral line of the circular locus from the outline of the three-dimensional object. The ratio that is open without being adjusted can be appropriately adjusted depending on the viscosity of the photocurable composition to be used, but is preferably arranged so that it is 50% or less. Further, with respect to the front protrusion shaped object, when the dimension in the direction orthogonal to the outer peripheral line of the circular locus is D and the dimension in the direction orthogonal to the D is W, the ratio between D and W of the protrusion shaped object. (D: W) is preferably in the range of 0.5: 1 to 3: 1, and the adjacent protrusion-shaped objects are arranged with an interval within three times the width of the protrusion-shaped object. It is preferable.

  According to the present invention, in the stereolithography method, since the uniformity of the film thickness of the photocurable composition to be applied can be improved, each cured layer can be formed with high accuracy. Thereby, a fine three-dimensional shaped object can be formed with high accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate. In the drawings, components having the same configuration or function and corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  In the stereolithography method according to the present invention, the photocurable composition is selectively irradiated with light to form a cured layer, the photocurable composition is again supplied onto the cured layer, and spread and applied with a recoater. By irradiating the photocurable composition with light, a cured layer is further formed, and by repeating this, each cured layer of the three-dimensional object is formed in the process of modeling the three-dimensional object in which the cured layer is laminated and integrated. In this case, in addition to a desired three-dimensional object, a protrusion-shaped object is formed around the three-dimensional object. By forming a protrusion-shaped object around the desired three-dimensional modeled object, the photocurable composition is suppressed from being pushed out or out of the three-dimensionally shaped region, and applied to the photocurable composition to be applied. This improves the uniformity of the film thickness.

  Specifically, a region where the protrusion-shaped object is disposed is set, and a plurality of protrusion-shaped objects are stacked and formed so that at least a part of the protrusion-shaped object is disposed in the set region. For example, the following areas (1) and (2) are used to determine the area where the protrusion-shaped object is arranged. (1) Assuming a virtual line connecting a point of 600 μm from the contact point on the tangential perpendicular extending from the contact point of the tangent to the outline of the three-dimensional object to the outside of the three-dimensional object, the virtual line and the three-dimensional object Set the area between. (2) It is also possible to set an area formed by a circle having a diameter of 600 μm moving around the outline of the three-dimensional object and a set of circle diameter trajectories drawn around the three-dimensional object. At this time, the trajectory of the perpendicular line or diameter is set to be parallel to the bottom surface. In addition, when the three-dimensional object is a set of a plurality of objects, an outline that faces the outside of the entire object is used. In addition, you may arrange | position a protrusion-shaped thing not only in the set area | region but on the outer side of the area | region.

As a specific shape of the protrusion-shaped object, for example, one having a protrusion shape such as a columnar shape such as a cylinder, an elliptical column or a polygonal column, a needle shape, a circular weight, an elliptical weight or a polygonal weight is preferable. When the lengths D and W of the protrusion-shaped object are defined as follows, the shape of the protrusion-shaped object is such that the ratio of D and W (D: W) is in the range of 0.5: 1 to 3: 1. A three-dimensional object is preferable. Here, in the present specification, in the case of (1), the length D is a length direction parallel to the coating surface and perpendicular to the imaginary line, and the length W is a length perpendicular to the D. The direction. In the case of (2), the length D is a dimension in a direction orthogonal to the outer peripheral line of the circular locus, and the length W is a dimension in a direction orthogonal to D.
Further, the specific size of the protrusion-shaped object can be appropriately determined in consideration of the height of the shaped object, that is, the height of the protrusion-shaped object, the number and density of the protrusion-shaped objects, and for example, the above D or W It is preferable that the smaller length is designed to be about 50 to 500 μm.

  Moreover, it is preferable that the protrusion-shaped object is uniformly arranged in a region having a predetermined width around the desired three-dimensional object. “Uniformly arranged” means that the protrusion-shaped objects are arranged without being hardened in one place, and are not necessarily arranged with the same density. In addition, the “region of a predetermined width” is, for example, a region having a width that is twice or more, preferably three times or more the length D of the protrusion-shaped object. The protrusion-shaped object can be arranged at a position where the distance from the outline of the three-dimensional object is different, and the width of this region can be increased. As an example, the case where the protrusion-shaped objects are arranged in a plurality of rows is applicable. In addition, since the modeling time increases as the “region of a predetermined width” increases, for example, a region having a width of 50 times or less of the length D of the protrusion-shaped object is considered to be sufficient.

  In this way, by disposing the protrusion-shaped object in the region having a predetermined width, the outflow of the photocurable composition is stopped in the region where the protrusion-shaped object is formed, and the photocurable composition flows out of the three-dimensionally shaped object. And the balance of the liquid level of the three-dimensional object can be expected. Depending on the characteristics of the photocurable composition, the protrusions can be arranged between the protrusions by arranging the protrusions with a predetermined width (for example, multiple rows). Can be prevented from leaking into. As a result, the liquid level is easily maintained constant.

  Furthermore, it is preferable that the ratio of the plurality of protrusion-shaped objects that are open without the protrusion-shaped objects being arranged is not more than a predetermined value when viewed in the vertical direction outward from the outline of the three-dimensional object. Specifically, when the region where the protrusion-shaped object is arranged from the position of the three-dimensional object in the direction in which the virtual line or the diameter trajectory assumed when setting the region above is orthogonal to the outer peripheral line, The protrusion-shaped object is arranged so that the percentage of the object that is open without being arranged is 50% or less. For example, when a plurality of protrusion-shaped objects are arranged, it is preferable that the protrusion-shaped objects in each row are arranged at positions shifted from each other so that the open ratio is reduced. As an example, the protrusion-shaped objects can be arranged so as to be staggered. In this way, by reducing the linear gap outward from the region where the desired three-dimensional object is formed and forming a curved line, the photocurable composition enters the curved shape between the protrusions. Therefore, it can suppress that a photocurable composition flows out outside.

  It is preferable that the space | interval of adjacent protrusion-shaped objects is an interval within 3 times the width | variety of a protrusion-shaped object. This interval is preferably set based on the characteristics of the photocurable composition. As the viscosity of the photocurable composition increases, it becomes difficult for the photocurable composition to flow out to the outside of the protrusion-shaped object, so that the interval can be increased. Therefore, the interval can be appropriately changed depending on the properties of the resin.

  Further, in the process of applying the photocurable composition for each lamination and preparing a thin film with the recoater, the liquid level tends to be high because the resistance (friction) is large at the position where the recoater starts to move. In the stereolithography method of the present embodiment, the position where the liquid level becomes high is the position where the protrusion-shaped object is disposed, and therefore it can be expected that the influence on the modeling of the region of the desired shape object is eliminated. Furthermore, if the desired three-dimensional object and the protrusion-shaped object have the same shape, the recoater can be moved under the same conditions, so it is easy to ensure the uniformity of the film thickness.

  Moreover, in order to take out the desired three-dimensionally shaped object after shaping the desired three-dimensionally shaped object, the protruding shaped object is removed. At this time, for example, a thin thread is placed between the three-dimensional object and the protruding object, and after forming the three-dimensional object, it is easily removed from the modeling table by pulling down the protruding object using the thread. be able to. For this reason, it can post-process without damage to a desired three-dimensionally shaped object. For example, it is possible to prevent breakage of the protrusion-shaped object generated when the protrusion-shaped object is removed from hitting the three-dimensional object and causing damage.

  As described above, the optical modeling method according to the present embodiment is characterized in that the liquid level in the modeling area is maintained by the surface tension of the protrusion-shaped object provided around. By forming the protrusion shape around the desired three-dimensional object, the height level of the desired three-dimensional object and the height level of the protrusion shape are stacked in the same manner. In this way, the cured layers of the desired three-dimensional object and the protrusion-shaped object are sequentially formed to match the height levels of the three-dimensional object and the protrusion-shaped object. In this way, even if the desired three-dimensional object is a fine top surface, it can be accurately modeled. Thereby, in the optical modeling field, especially in the optical modeling method of repeatedly applying the composition on the base material, irradiating light and laminating, when modeling using a high viscosity resin, thixotropic resin, The surface tension of the protrusion-shaped object provided around the surface suppresses the liquid surface height variation of the desired three-dimensionally shaped object (modeling area), and enables the fine shape to be accurately modeled up to the final layer.

  Then, the optical modeling apparatus using the optical modeling method of this Embodiment is demonstrated. FIG. 1 is a diagram illustrating a configuration example of an optical modeling apparatus used in the optical modeling method according to the present invention. As illustrated in FIG. 1, the optical modeling apparatus 100 includes a light source 1, a digital mirror device (DMD) 2, a condenser lens 3, a modeling table 4, a dispenser 5, a recoater 6, a control unit 7, and a storage unit 8. In FIG. 1, the optical modeling apparatus 100 shows a state where the photocurable composition 9 is supplied onto the modeling table 4 and the photocurable resin 10 is formed.

  The light source 1 generates light for curing the photocurable composition 9 supplied on the modeling table 4. For example, a laser diode (LD) or an ultraviolet (UV) lamp that generates 405 nm laser light is used. The type of the light source 1 is selected according to the curing wavelength of the photocurable composition 9, and the optical modeling method of the present invention does not limit the type of the light source 1.

The digital mirror device (DMD) 2 is packed with a large number of independently moving micromirrors on a CMOS (Complementary Metal Oxide Semiconductor) semiconductor, and the micromirrors are tilted at a constant angle about a diagonal line by an electrostatic field effect. Is a device that can. As the DMD, for example, a device of Texas Instruments Inc. can be used. The entire DMD 2 used in the present embodiment has a quadrilateral shape of 40.8 × 31.8 mm (of which the mirror portion has a quadrangular shape of 14.0 × 10.5 mm), and an interval of 1 μm. The length of one side arranged in 1. is composed of 786,432 micromirrors having a length of 13.68 μm, and the mirror can be tilted about ± 12 degrees about the diagonal line.
The DMD 2 reflects the light emitted from the light source 1 by the individual micromirrors, and only the light reflected by the micromirrors controlled by the control unit 7 at a predetermined angle passes through the condenser lens 3 on the modeling table 4. The photocurable composition 9 supplied to is irradiated. A region of the photocurable composition 9 to which the light beam reflected by the DMD 2 is irradiated at once through the condenser lens 3 is referred to as a projection region. After the exposure of one projection area, the modeling table 4 is moved and the adjacent projection area is exposed. By repeating this, the batch exposure with the projection area as a unit is repeatedly executed.

  The condenser lens 3 guides the light beam reflected by the DMD 2 onto the photocurable composition 9 to form a projection region. The condenser lens 3 may be a condenser lens 3 using a convex lens or a concave lens. If a concave lens is used, a projection area larger than the actual size of the DSM can be obtained. For example, the condensing lens 3 according to the present embodiment reduces incident light by about 15 times and condenses it on the photocurable composition 9.

  The modeling table 4 is a flat table on which the photo-curing resin 10 obtained by curing the photo-curable composition 9 is sequentially deposited and placed. The modeling table 4 can be moved horizontally and vertically by a driving mechanism (not shown), that is, a moving mechanism. With this drive mechanism, stereolithography can be performed over a desired range.

The dispenser 5 accommodates the photocurable composition 9 and supplies a predetermined amount of the photocurable composition 9 to a predetermined position.
The recoater 6 includes, for example, a blade mechanism and a moving mechanism, and uniformly applies the photocurable composition 9. The recoater 6 is not limited to the combination of the blade mechanism and the moving mechanism, and may be other as long as the recoater 6 has a mechanism that can uniformly spread the photocurable composition 9 to be applied.

  The control unit 7 controls the light source 1, DMD 2, modeling table 4, dispenser 5, and recoater 6 according to the control data. The control unit 7 can typically be configured by installing a predetermined program in a computer. A typical computer configuration includes a central processing unit (CPU) and memory. The CPU and the memory are connected to an external storage device such as a hard disk device as an auxiliary storage device via a bus. This external storage device functions as the storage unit 8 of the control unit 7. A storage medium drive device such as a flexible disk device, a hard disk device, or a CD-ROM (Compact Disk Read Only Memory) drive is connected to the bus via various controllers. A portable storage medium such as a flexible disk is inserted into a storage medium driving apparatus such as a flexible disk apparatus. The storage medium can store a predetermined computer program for executing the present embodiment by giving an instruction to the CPU or the like in cooperation with the operating system.

  The storage unit 8 mainly stores modeling data of a cross-sectional group obtained by slicing a three-dimensional object to be modeled into a plurality of layers. Based on the modeling data stored in the storage unit 8, the control unit 7 controls the position of the light irradiation range with respect to the three-dimensional object mainly by controlling the angle of each micromirror in the DMD 2 and moving the modeling table 4. Execute shaping of the shaped object.

  The computer program is executed by being loaded into a memory. The computer program can be compressed or divided into a plurality of parts and stored in a storage medium. In addition, user interface hardware can be provided. Examples of the user interface hardware include a pointing device for inputting such as a mouse, a keyboard, or a display for presenting visual data to the user.

As the photocurable composition 9, a composition that is cured by visible light and light outside the visible light region is used. Specifically, an epoxy or acrylic photocurable composition can be used. For example, a composition having a curing depth of 15 μm or more (500 mJ / cm ² ), a viscosity of 10,000 to 100,000 mPa · s (25 ° C.), or a lower viscosity and a thixotropy, The composition which hardens | cures by irradiation of visible light can be used.

  The optical modeling apparatus as described above operates as follows. First, the uncured photocurable composition 9 is accommodated in the dispenser 5. The modeling table 4 is in the initial position. The dispenser 5 supplies the stored photocurable composition 9 on the modeling table 4 by a predetermined amount. The recoater 6 sweeps the photocurable composition 9 so as to stretch and forms a coat layer for one layer to be cured.

  The light beam emitted from the light source 1 enters the DMD 2. The DMD 2 is controlled by the control unit 7 and adjusts the angles of a part of the micromirrors corresponding to the portions (a desired three-dimensional shape and protrusion shape) that irradiate the photocurable composition 9 with light rays. As a result, the light beam reflected from a part of the micromirrors is irradiated to the photocurable composition 9 via the condenser lens 3, and the light beam reflected from the other micromirrors is not irradiated to the photocurable composition 9. The irradiation amount of the light to the photocurable composition 9 can be appropriately adjusted so that optimum curability is obtained depending on the type of the photocurable composition. At this time, the projection area onto the photocurable composition 9 is a factor that depends on the number of mirrors of the DMD 2, the size of each mirror, the type of objective lens, and the projection magnification, but the resolution required for the three-dimensional object. By appropriately adopting a projection magnification corresponding to For example, when the projection area is about 1.3 × 1.8 mm, when forming a three-dimensional object larger than the size of one projection area, it is necessary to move the irradiation position of the light beam for irradiation. . For example, if the maximum size (X × Y) of stereolithography is set, this is divided into a plurality of projection regions (x × y), and each one is irradiated with light rays one shot at a time. Thus, by irradiating with light while scanning the projection area, the photocurable composition 9 is cured and a first cured layer is formed. The stacking pitch for one layer, that is, the thickness of one cured layer is, for example, 0.5 to 10 μm, preferably 1 to 5 μm.

  Next, a second layer of a three-dimensional object having a desired shape and a protrusion-shaped object is formed in the same process. Specifically, the photocurable composition 9 supplied from the dispenser 5 is applied to the outside of the cured layer formed as the first layer so as to be stretched beyond the three-dimensional shape by the recoater 6. Then, a second cured layer is formed on the first cured layer by irradiation with light. In the same manner, the third and subsequent cured layers are sequentially deposited. Then, when the deposition of the final layer is completed, the stereolithography object formed on the modeling table 4 is taken out.

Moreover, the optical modeling method according to the present invention can be applied to a method of curing a resin by surface exposure in an optical modeling apparatus. In particular, it is possible to apply a light modeling method for forming a three-dimensional model by repeating the formation of a cured layer by irradiating a coating film of a photocurable composition with a projection area of 100 mm ² or less as a unit. it can.

Examples that are specifically modeled using the optical modeling method described in the above embodiment will be described. However, the shapes of the three-dimensional object and the protrusion-shaped object are only examples, and are not limited thereto.
FIG. 2 is a diagram illustrating an area for forming a desired three-dimensional object and an area for forming a protrusion-shaped object in the embodiment. A protrusion-shaped object was formed in the protrusion-shaped area 22 around the desired-shaped area 21 shown in FIG.
Specifically, hundred or more cylindrical shapes having a diameter of 300 μm were modeled as desired three-dimensional shapes to be modeled in the desired shape area 21. In addition, as a protrusion-shaped object to be modeled in the protrusion-shaped area 22, four columns of about 100 μm are arranged around the periphery, and the interval is 300 μm. FIG. 3 shows a schematic diagram of a three-dimensional object and a protrusion-shaped object. As a photocurable composition, a JSR JL2143 photocurable resin (high viscosity type, about 10,000 mPa · s) or a thixotropic resin dispersed with 3 to 4% by weight of Aerosil in a JSR TKS4005 photocurable resin is used. I shaped it.
In the above method, a desired three-dimensional object could be formed. Moreover, the protrusion-shaped object could be removed without damaging the three-dimensionally-shaped object.

  In addition, by forming protrusion-shaped objects around a desired three-dimensional object, the following effects were produced when the photocurable composition was spread and applied on a photocurable resin with a recoater. FIG. 4 is a diagram schematically showing a state in which the photocurable composition is applied including the protrusion-shaped area shown in FIG. FIG. 4A shows an example of a state where the liquid levels on both sides are lowered, and FIG. 4B shows the influence of the recoater 6. The symbols A to D in FIG. 4 correspond to the positions of the same symbols in FIG. In the step of applying the photocurable composition 9 to the desired shape area 21 and the protrusion shape area 22 in FIG. 2 for each lamination and preparing a thin film with the recoater 6, the recoater 6 is moved from A to C (or B to D). A case will be described as an example. 4A is a view from the side surface of AB (or the side surface of CD), and FIG. 4B is a view from the side surface of AC (or the side surface of BD). FIG.

  As shown in FIG. 4A, the photocurable composition 9 covers the entire desired shape area 21 and keeps the position of the liquid level constant because the position where the liquid level falls is shifted outward as compared with FIG. I was drunk. Moreover, as shown in FIG. 3, by arranging a plurality of protrusion-shaped objects, the desired shape area 21 is more easily removed from the end of the application region of the photocurable composition 9 (the desired shape area 21 and the protrusion shape area 22). Since it is on the inner side, the liquid level of the desired shape area 21 can be easily balanced. In particular, when four or more rows of protrusion-shaped objects are arranged, there is an effect of making the liquid surface of the desired shape area 21 uniform.

The present invention is not limited to the embodiment described above. Within the scope of the present invention, it is possible to change, add, and convert each element of the above-described embodiment into a content that can be easily considered by those skilled in the art.
For example, the present invention can be expressed as follows.
Appendix 1:
The photocurable composition is selectively irradiated with light to form a cured layer, the photocurable composition is again supplied onto the cured layer, and the photocurable composition spread and applied with a recoater is irradiated with light. Is a stereolithography method for modeling a three-dimensional object in which the cured layer is laminated and integrated by repeating this to further form a cured layer,
A circle having a diameter of 600 μm is moved so as to be in contact with the outline of the three-dimensional object, and at least a part of the protrusion-shaped object is arranged in a region formed around the three-dimensional object. An optical modeling method for laminating a plurality of protrusion-shaped objects.
Appendix 2:
The stereolithography method according to appendix 1, wherein the plurality of protrusion-shaped objects are uniformly arranged over an entire region where a predetermined protrusion-shaped object is disposed.
Appendix 3:
Supplementary note 2 wherein the entire region to be arranged surrounds the three-dimensional object with a width that is at least twice as large as the dimension D in the direction orthogonal to the outer circumferential line of the circle locus. The optical shaping method described in 1.
Appendix 4:
In the plurality of protrusion-shaped objects, the ratio of the protrusion-shaped objects that are open without being arranged in the direction perpendicular to the outer peripheral line of the circular locus from the outline of the three-dimensionally-shaped object is 50% or less. The stereolithography method according to appendix 1 or 2, characterized by being arranged as described above.
Appendix 5:
For the protrusion-shaped object, the ratio of D to W of the protrusion-shaped object (D, where D is the dimension in the direction orthogonal to the outer peripheral line of the locus of the circle and W is the dimension in the direction orthogonal to D : W) is in the range of 0.5: 1 to 3: 1, the stereolithography method according to any one of appendices 1 to 4.
Appendix 6:
6. The stereolithography method according to any one of appendices 1 to 5, wherein the adjacent protrusion-shaped objects are arranged with an interval within three times the width of the protrusion-shaped object.

It is a figure which shows the structural example of the optical modeling apparatus used for the optical modeling method which concerns on this invention. It is a figure which shows the area which forms the desired three-dimensional shaped object in an Example, and the area which forms a protrusion-shaped object. It is a schematic diagram of the three-dimensional shape object and the protrusion shape object which were modeled in the examples. It is a figure which shows typically the state which apply | coated the photocurable composition also including the protrusion-shaped area shown in FIG. (A) shows the example of a state where the liquid level of both sides becomes low, and (b) shows the influence by the recoater. It is a figure which shows an example of the area which forms a desired three-dimensional shaped object. It is a figure which shows the example of a state which apply | coated the photocurable composition to the area which forms a desired three-dimensional shaped object.

Explanation of symbols

1 Light source 2 DMD
DESCRIPTION OF SYMBOLS 3 Condensing lens 4 Modeling table 5 Dispenser 6 Recoater 7 Control part 8 Memory | storage part 9 Photocurable composition 10 Photocurable resin 21 Desired shape area 22 Protrusion shape area 100 Stereolithography apparatus

Claims (5)

The photocurable composition is selectively irradiated with light to form a cured layer, the photocurable composition is again supplied onto the cured layer, and the photocurable composition spread and applied with a recoater is irradiated with light. Is a stereolithography method for modeling a three-dimensional object in which the cured layer is laminated and integrated by repeating this to further form a cured layer,
The solid from the shape thereof in a circumferential 囲領 area of the three-dimensional object within 600 .mu.m, the stereolithography method of laminating formed so that a plurality of projecting shapes thereof are staggered. 2. The light according to claim 1, wherein the plurality of protrusion-shaped objects are arranged so that a ratio of the protrusion-shaped objects being opened in the surrounding region without being arranged is 50% or less. Modeling method. The stereolithography method according to claim 1, wherein the plurality of protrusion-shaped objects are uniformly arranged over the entire surrounding area.   4. The stereolithography method according to claim 1, wherein the adjacent protrusion-shaped objects are arranged with an interval within three times the width of the protrusion-shaped object. 5. It said peripheral region, claim 1, characterized in that the area where the circle locus described by moving in contact with a circle having a diameter of 600μm to outline of the three-dimensional object is formed around the three-dimensional object The optical modeling method as described in any one of thru | or 4.

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