KR20180133746A - stereo lithography method for solid structure and apparatus thereof - Google Patents

Abstract

To improve molding accuracy, the present invention provides a stereolithography method for a 3d structure, wherein the method comprises the following steps: a first step in which modeling data corresponding to the 3d structure is divided depending on a predetermined lamination thickness, and a molded pixel for irradiating hardening light and an unmolded pixel for shielding the hardened light are divided depending on a substantially formed region of each divided sectional layer, thereby setting a layer image; a second step of gradating each of the formed pixels so that the luminous intensity distribution of an image formation in which the layer image is displayed is compensated; and a third step of sequentially displaying the processed layer images on the upper part of the image to form each cross-sectional layer corresponding to the 3d structure.

Description

[0001] The present invention relates to a stereolithography method and apparatus for stereolithography,

The present invention relates to a stereolithography method and apparatus for a three-dimensional structure, and more particularly, to a stereolithography method and apparatus for a three-dimensional structure with improved molding accuracy.

SLA (StereoLithography Aperture), which is one of the rapid prototyping methods, generates a cross-sectional image of fine thickness through the conversion of three-dimensional CAD data and then irradiates light selectively passing through the cross-sectional image to a photo- And curing the material to a fine thickness, and repeatedly layering the materials one by one to fabricate a three-dimensional CAD data structure.

Such rapid prototyping technology is applied to the micro / nano industry field and is used to manufacture micro-precision parts, information / communication equipment, medical equipment and the like.

Although the microwave rapid prototyping technique described above has a disadvantage in that a working material is limited by a photo-curing resin, it is possible to easily produce a complicated three-dimensional microstructure or a polymer mold for forming a microstructure, Is increasing.

At this time, the rapid prototyping apparatus is divided into a scan type in which molding is performed by scanning by scanning light that moves according to a method of supplying light for curing, and a transfer type in which molding is performed by projection by transferring light, A rapid prototyping apparatus of the transfer type capable of rapid and precise forming is widely used.

At this time, the rapid prototyping apparatus of the transfer type employs a method of irradiating light output in a predetermined pattern to the photo-curing resin by using a projection apparatus such as a DLP having a DMD chip or an LCD layer therein.

However, in the conventional DLP apparatus, the irradiation range is limited to 15 cm x 15 cm. In the case of increasing the irradiation area for enlarging the processing range, the accuracy of the molding is drastically reduced, and thus the range of application such as jewelery and figure production is limited .

Particularly, when the irradiation region is increased, the light intensity deviation per position in the irradiation region is increased, so that the portion irradiated with the cured light of high light intensity is cured and the portion irradiated with the cured light of low light intensity is cured, In addition, there is a problem that molding strength and quality are deteriorated due to delamination phenomenon.

That is, since one cross-section layer is cured by cured light of high light intensity and cured light of low light intensity, when setting the irradiation or curing time based on cured light of low light intensity, There is a problem in that the cross-sectional shape is distorted because the hardening region expands to the periphery.

In addition, in the case of setting the irradiation or curing time based on the cured light of high light intensity, not only the cured area is narrowed at the portion irradiated with the cured light of low lightness to cause the distortion of the shape, There is a problem that the bonding force with

Korean Patent No. 10-0251552

In order to solve the above problems, the present invention provides a stereolithography method and apparatus of a three-dimensional structure with improved molding accuracy.

According to an aspect of the present invention, there is provided a method of fabricating a three-dimensional structure, the method comprising: dividing modeling data corresponding to a three-dimensional structure according to a predetermined lamination thickness, A first step in which a non-shaping pixel for blocking light is divided to set a layer image; A second step of gradating each of the formed pixels so that a luminous intensity distribution of an image forming unit in which the layer image is displayed is compensated; And a third step in which the processed layer image is sequentially displayed on the image forming part to form each cross-sectional layer corresponding to the three-dimensional structure.

Here, the second step may be a step of adjusting the gradation density of the grayscale image in which the grayscale concentration of each pixel is adjusted in correspondence with the distribution of luminosity for each region of the image forming unit so that the luminosity deviation of the cured light output through each of the shaping pixels is compensated within a predetermined range. Is overlaid on the layer image so that each of the formed pixels is corrected to a brightness distribution corresponding to a threshold value of the brightness distribution of each region.

The second step may further include a step of adjusting the maximum gray level of the formed image so that the minimum color tone of the shaped pixels of the processed layer image exceeds a setting threshold of the molding material to be formed in the color image, And a value is set.

According to the present invention, the modeling data corresponding to the three-dimensional structure is divided according to the predetermined lamination thickness, and the shape pixels for irradiating the hardening light and the non- A cross-sectional image generation unit for setting a layer image by dividing pixels; A gradation image of a gray scale in which the grayscale concentration of each pixel is adjusted in correspondence with the distribution of luminous intensity for each area of the image forming section in which the layer image is displayed is set so that the luminous intensity deviation of the cured light outputted through each of the formed pixels is compensated within a predetermined range An optical walker for correcting each of the formed pixels by a brightness distribution corresponding to a threshold value of the luminous intensity distribution of each region through the layer image and the overlay of the gradation image; An image output unit sequentially displaying the corrected layer images on the image formation unit so that each cross-sectional layer corresponding to the three-dimensional structure is formed; A curing water tank in which a filling space is formed in which a molding material is stored, and the image forming unit is formed on one side of the image output unit opposite to the image output unit so that the molding material is cured; And a shaping stage which is arranged to cover the image forming portion and is formed and which is sequentially moved in the stacking direction of the sectional layers.

It is preferable that the optical walker sets the maximum value of the grayscale concentration according to the deviation between the maximum luminosity and the minimum luminosity of the image forming portion so that the minimum shaping pixel of the corrected layer image exceeds the setting threshold of the molding material Do.

Through the above solution, the present invention provides the following effects.

First, since the deviation between the central part and the outer part of the cured light irradiated onto the image is reduced through the graded layer image, the molding material can be cured at a uniform speed without partial curing or curing, As molding is possible, structural stability between adjacent cross-sectional layers is improved, the precision and quality of molding of the device can be improved.

Second, unlike optical devices that control the surface curvature of a lens, a reflective mirror, or the like, the intensity of the output curing light is precisely and easily adjusted for each fine region corresponding to one pixel through direct brightness control for each formed pixel So that the molding precision of the device can be improved and the economical efficiency and productivity of the device can be improved with a compact structure requiring no separate optical device.

Third, if one gradation image is set according to the luminous intensity distribution of each image forming region, the brightness adjusting process for a plurality of layer images can be performed quickly through a simple image processing process such as overreproduction, It can be applied to various molding conditions such as the type of the light source and the irradiation area by simply setting the gradation image by detecting the astigmatism distribution so that the compatibility and efficiency of the apparatus can be improved.

1 is a flowchart illustrating a stereolithography method of a three-dimensional structure according to an embodiment of the present invention.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a three-
3 is a block diagram illustrating a stereolithography apparatus for a three-dimensional structure according to an embodiment of the present invention.
FIGS. 4A, 4B, and 4C are views illustrating a process of processing a layer image in a stereolithography method of a three-dimensional structure according to an embodiment of the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and apparatus for stereolithography of a three-dimensional structure according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart illustrating a stereolithography method of a three-dimensional structure according to an embodiment of the present invention. FIG. 2 is an exemplary view illustrating a stereolithography apparatus for a three-dimensional structure according to an embodiment of the present invention. 4A, 4B and 4C are views illustrating a process of processing a layer image in a stereolithography method of a three-dimensional structure according to an embodiment of the present invention. Fig.

1 to 4C, the stereolithography apparatus 100 includes a cross-sectional image generation unit 52, a light walking unit 53, an image output unit 30, a curing water tank 10, a molding stage 40 ), And a shaping control unit (51).

Here, the curing water tank 10 has a receiving space in which the molding material r is stored, and the one side 11 is provided as a translucent material.

In detail, the molding material (r) may be made of various materials such as a photo-curable resin, a powder resin, etc., which are hardened or sintered through a light having a fluidity or a solid powder state, Hereinafter, the case where the molding material (r) is made of a photo-curing resin will be described as an example.

As shown in the figure, the image output unit 30 is disposed at the bottom of the curing water tank 10, and the image output unit 30 is disposed at the upper side It is preferable that the lower surface of the curing water tank 10 is made of a translucent material.

At this time, a concave portion (c) is formed on one side of the receiving space, and the concave portion (c) .

The image formation part c may be formed at a different position depending on the wavelength of the incident light, the molding material r and the light transmittance of the curing water tank 10, but in most cases, And is formed on the lower side of the accommodation space. At this time, the molding material (r) positioned at the image portion (c) may be formed into a shape corresponding to the displayed image.

Then, the molding stage 40 is arranged to cover the forming portion c so that the molded molding material r is engaged. In detail, the image output unit 30 outputs an image corresponding to each divided sectional layer in a state where a three-dimensional structure to be formed is divided in a predetermined stacking direction. That is, the image output unit 30 may output cured light having a wavelength for shaping the molding material (r) in the form of an image corresponding to the cross-sectional layer. Accordingly, the image corresponding to each cross-sectional layer is displayed on the image part (c), and curing light is supplied according to the displayed image so that the molding material (r) of the image part (c) It can be formed into the shape of a cross-sectional layer.

The molding stage 40 is disposed such that the lower surface portion 41 covers the upper portion of the forming portion c and the sectional layer is integrally joined to the lower surface portion 41 of the molding stage 40 It is shaped. At this time, the molding stage 40 is connected to the driving means 42, and can be sequentially moved in the lamination direction of the cross-sectional layers at the completion of molding of the cross-sectional layers.

That is, the patterned cross-section layer is moved with the molding stage 40 to be positioned on top of the concave portion c, and the subsequent cross-sectional layer is shaped to be integrally joined to the previously formed cross-sectional layer, A single finished three-dimensional structure can be formed so that a plurality of cross-sectional layers are interconnected.

At this time, the shaping control unit 51 performs image generation and correction through the sectional image generating unit 52 and the optical walking unit 53, output of the image output unit 30 according to the corrected image, ) Can be successively controlled so that all molding processes such as the movement of the molds are sequentially repeated.

Here, the molding controller 51 refers to a control module that controls the three-dimensional molding device 100. The optical walk section 53 refers to the layer image 1 (hereinafter, referred to as " layer image 1 ") for analyzing the modeling data to set a plurality of layer images 1 suitable for laminate shaping, ) Of the image correction module. In this case, each module is classified according to an independent function. The molding control unit 51, the sectional image generating unit 52, and the light walking unit 53 may be provided in one processor or may be provided in a plurality of independent processors .

The sectional image generating unit 52 divides the modeling data corresponding to the three-dimensional structure according to a predetermined lamination thickness, and forms the shaping pixel 1a for irradiating the cured light according to the substantial shaping regions of the divided sectional layers. And the unshaped pixel 1b, in which the cured light is blocked, to thereby set the layer image 1. That is, referring to FIG. 2 to FIG. 4A, the layer image (1) refers to an image showing each sectional layer divided in a state where the modeling data is divided into a plurality of layers in a predetermined stacking direction for laminate molding.

Here, the lamination thickness means a thickness at which one cross-sectional layer is formed, and is set to a fine thickness in order to improve molding precision, and is adjusted by considering the reaction sensitivity of the molding material (r), the curing rate, .

The shaping pixel 1a is a white portion indicating the shape of the substantial cross-sectional layer, and means a region where substantially cured light is output. In addition, the un-shaped pixel 1b is a black portion indicating an outer region of the cross-sectional layer, and means an area where the output of the cured light is restricted or blocked.

That is, the layer image 1 means a monochrome image composed of a plurality of forming pixels 1a and a plurality of unshaped pixels 1b, and cured light is output through each forming pixel 1a, c, a layer image (1) corresponding to the cross-sectional layer may be displayed on the image portion (c).

At this time, the molding material (r) of the concave portion (c) may be formed into a shape corresponding to the cross-sectional layer by receiving the cured light outputted to correspond to the molding pixel 1a.

Meanwhile, the optical walk unit 53 performs gradation processing on each of the formed pixels 1a so that the luminous intensity distribution of each of the regions of the image portion (c) in which the layer image (1) is displayed is compensated. At this time, the image output unit 30 sequentially displays the corrected layer image 3 on the image portion c.

In detail, the image output unit 30 may include an internal light source 31 for emitting curing light and a patterning unit 32 for controlling an output shape of the internal light source 31. Accordingly, the cured light outputted to correspond to the corrected layer image 3 can be irradiated at once along the image portion (c), and one sectional layer can be integrally formed.

In this case, the patterning unit 32 may be a DMD chip (digital mirror device chip) that adjusts an output light intensity for each pixel according to a plurality of arranged reflection angles and outputs an image, And a liquid crystal display (LCD) for outputting an image by adjusting the output luminous intensity of each pixel according to the respective transmissivities of the light sources. Hereinafter, the patterning unit 32 is provided as a DMD chip so as to minimize the amount of light when the cured light emitted to the internal light source 31 is outputted as an image.

At this time, the cured light emitted from the internal light source 31 has a luminous intensity distribution corresponding to a Gauss distribution with a high luminous intensity (light intensity) toward the center and a low luminous intensity toward the outside. Accordingly, the cured light output through the patterned patterning portion 32 corresponding to each of the formed pixels 1a and the cured light emitted to the imaging portion c has a higher light intensity towards the center and a lower light intensity towards the outer side .

Here, the image portion (c) refers to a maximum irradiated region irradiated with the cured light output in a state where the entire area of the patterning portion 32 is patterned with the white color forming pixel 1a, The light intensity distribution by region also has a light intensity distribution corresponding to the Gaussian distribution.

That is, since the luminous intensity of the cured light irradiated on the image portion (c) is high in the central region and low in the outer region, a deviation is formed in the luminous intensity of each portion of the image portion (c).

At this time, the gradation processing means that the density of each of the shaping pixels 1a in the layer image 1 is adjusted, and the degree of lightness and darkness of each shaping pixel 1a is adjusted, The light intensity distribution can be compensated.

That is, the intensity of the hardening light output to the image formation part (c) is reduced through the darkened modified pixel at a low brightness, but the intensity of the hardening light outputted is maintained through the molding pixel maintaining a bright state with a high brightness, The inter-region luminous intensity deviation of the cured light output to the image formation portion (c) can be reduced in accordance with each adjusted shaping pixel.

Accordingly, the curing speed and the curing quality of the molding material (r) can be made uniform in each region of the forming portion (c), and a precise sectional layer is formed without partial curing or curing, Can be stably connected, so that the molding quality and precision of the device can be improved.

Also, without any additional optical device such as a lens for adjusting the amount of light emitted by the light source itself or the patterned portion 32 for the emitted cured light, a mirror for reflecting light, or the like, Can be compensated so that the light intensity deviation between regions of the cured light can be compensated so that the molding precision of the device is improved and the economical efficiency and productivity of the device can be simultaneously improved through the compact structure.

In addition, unlike the optical device that adjusts the surface curvature of a lens, a reflective mirror, etc., the intensity of the hardening light output through the brightness control for each molding pixel 1a can be precisely adjusted for each fine region corresponding to one pixel It is possible to easily control image function values such as GSDF (grayscale standard display function), RGB, and HSV by digital control.

On the other hand, the optical walk unit 53 sets a gradation image 2 of a gray scale in which the grayscale concentration of each pixel is adjusted according to the luminous intensity distribution of each of the regions (c). Then, the respective shaping pixels (1a) are arranged on the overlay of the layer image (1) and the gradation image (2) so that the light intensity deviation between the regions of the cured light output through the respective shaping pixels is reduced to within a predetermined range Correction processing is performed with a brightness distribution corresponding to the threshold value of the luminous intensity distribution.

That is, when the corrected layer image 3 is transmitted to the image output unit 30 through the optical walk unit 53, the area of the cured light output from the light output area 33 of the image output unit 30 The light intensity variation can be reduced. At this time, the light intensity deviation means a light intensity deviation between regions in a portion excluding the unshaped pixel 1b.

2 to 4B, the gradation image 2 may have a size covering the entire light output area 33 of the image output unit 30. [

The gradation image 2 has a luminous intensity per area of the light output area 33 or the coloring part c in a reference state in which white pixels are output through the entire light output area 33 of the image output part 30, It is preferable that the grayscale concentration of each pixel is set so as to have a distribution corresponding to the distribution. That is, it is preferable that the grayscale concentration for each pixel of the gradation image 2 is set to have a distribution proportional to the distribution of luminosity for each region of the image portion (c).

At this time, the gradation image (2) has gray pixels of a darker concentration toward the central portion with a higher light intensity in the reference state, and the gray scale concentration decreases as the distance from the reference state to the lower outer region becomes lower. do.

Each of the formed pixels 1a of the layer image 1 overlaps each of the pixels of the corresponding area in the gradation image 2 and is subjected to gradation processing so that the layer image 3 corrected through the gradation process May be output through the image output unit (30).

At this time, each pixel of the gradation image 2 is over-repaired to the formed pixel 1a which is mutually matched based on the light output area 33 of the image output unit 30 or the display area within the image formation area c desirable. Accordingly, the black and white layer image 1 can be corrected to the gray-scale layer image 3.

4C, the shaping pixel 3a of the corrected layer image 3 is switched to the grayscale of the reversed brightness distribution with respect to the luminous intensity distribution of the concave portion c or the light output region 33 And the unshaped pixel 3b is kept black.

For example, in the case where the luminous intensity distribution per region of the image portion (c) is a Gaussian distribution, the shaped pixels 3a of the layer image 3 can be corrected so that the luminosity distribution per pixel has an inverse Gaussian distribution.

That is, the corrected layered image (3) has a gray luminous pixel (3a) with a dark luminosity in a region with a high initial luminosity distribution, and a gray or white luminous luminous pixel (3a) . Herein, the initial luminous intensity distribution means a luminous intensity distribution per area of the light output area 33 or the coloring part (c) in the reference state in which white pixels are outputted through the total light output area 33 of the image output part 30 do.

Then, the brightness of the cured light is reduced through the low-gray-scale gray-scale pixel 3a, and the brightness of the cured light is maintained or slightly reduced through the high-brightness gray or white-colored pixel 3a. In other words, the brightness of the portion having high brightness due to the brightness deviation of the inner light source 31 before the correction is reduced through the gray-scale shaped pixels having the high brightness after correction, The portion having low brightness will maintain the brightness through the gray or white formed pixel after correction.

Accordingly, the distribution of luminous intensity of each of the regions (c) in which the corrected layer image (3) is displayed can be made uniform. That is, since the light intensity deviation between regions of the image portion (c) is reduced, the molding material (r) of each region in the image portion (c) is cured at a uniform speed, and the quality and precision of molding of the device can be improved.

In addition, the inter-area luminous intensity deviation of the cured light output through the direct brightness control of the image per se of the image itself can be reduced, so that the economical efficiency and productivity of the device can be improved through the compact structure in which the separate optical device is removed.

In addition, unlike an optical device that adjusts the surface curvature of a lens, a reflective mirror, or the like, digital control of the image function values for each of the shaping pixels 1a allows the intensity of the hardened light to be precisely .

Further, when one gradation image 2 is set, a brightness adjustment process for a plurality of layer images 1 for area-based luminous intensity distribution compensation is performed through a simple image processing process such as overrepresentation of a predetermined gradation image (2) The processing speed of the apparatus can be improved.

In addition, simply by setting the gradation image (2) by detecting the luminous intensity distribution for each region of the image portion (c), the type of the light source / molding material, the position of the light source, the distance from the light source to the molding material, c), and the like, so that the compatibility and efficiency of the device can be improved.

1, a stereolithography method of a three-dimensional structure according to an embodiment of the present invention includes a setting s10 of a layer image 1, a gradation processing s20 of a layer image 1, And a cross-sectional layer forming process (s30) using the image (3). 1 to 4A, the modeling data corresponding to the three-dimensional structure is divided according to a predetermined lamination thickness, and the shaped pixel 1a for irradiating the cured light according to the substantially formed region of each divided sectional layer, And the unshaped pixel 1b for shielding the cured light are separated to set the layer image 1 (s10).

Then, the formed pixels 1a of the layer image 1 are graded so as to compensate for the luminous intensity distribution for each region of the image portion (c) (s20).

At this time, a gradation image 2 of gray scale in which the grayscale concentration of each pixel is adjusted according to the luminous intensity distribution of each region of the image portion c is overlaid on the layer image 1, Lt; / RTI >

Here, the luminous intensity distribution of each of the image portions (c) is obtained by dividing the luminous intensity distribution measured at the actual image portion (c) in a reference state in which white pixels are outputted through the entire light output area 33 of the image output portion 30 But it is also possible to replace the light intensity distribution measured with respect to the light output area 33 of the image output section 30 in the reference state.

In addition, the luminous intensity distribution per area may be continuously measured for the undifferentiated area coordinates corresponding to one pixel, or may be measured in blocks of a small area corresponding to a plurality of pixel sets. The grayscale density is adjusted for each pixel of the gradation image (2) when the luminosity distribution for each region is continuously measured for each of the undifferentiated region coordinates. When the luminosity distribution for each region is measured in units of blocks, The grayscale level can be adjusted on a block-by-pixel basis in the image (2).

Here, it is preferable that the deviation between the maximum brightness and the minimum brightness for each pixel of the gradation image (2) is set to have a deviation corresponding to the maximum brightness and the minimum brightness of the image portion (c) in the reference state.

Then, as shown in FIG. 4C, the processed layer image 3 is sequentially displayed on the image part (c) so that each cross-sectional layer corresponding to the three-dimensional structure can be formed (s30). Of course, the continuous shaping process for such a plurality of cross-sectional layers may be performed by setting and correcting the subsequent layer image 1 after the correction process and the cross-sectional layer are formed in the state that the layer image 1 for each cross- It is also possible that the cross-sectional layers are successively formed after the correction process for the entire layer image 1 is completed in a state where the entire layer image 1 corresponding to the three-dimensional structure is set.

The minimum brightness of the shaping pixels 3a of the corrected layer image 3 in the gradation image 2 is set so that the layer image 1 is graded at step s20, It is preferable that the maximum value of the grayscale concentration is set in accordance with the deviation between the maximum luminosity and the minimum luminosity of the concave portion (c) so as to exceed the setting threshold of the molding material (r) to be formed in the concave portion (c). Herein, it is understood that the curing threshold value of the molding material (r) means the minimum brightness at which the curing reaction of the molding material (r) is activated, and the minimum brightness of the molding pixels (3a) Means brightness in a state where the pixel is overrepresented by pixels having the maximum grayscale level.

That is, the fact that the minimum brightness of the corrected shaping pixel 3a exceeds the setting threshold of the molding material r means that the brightness of the curing light output through the shaping pixel 3a with the minimum brightness is smaller than the curing threshold Value is greater than the minimum luminous intensity corresponding to the value.

Specifically, the internal light source 31 is set so that the light output is such that the outermost low luminous intensity portion exceeds the curing threshold value. Accordingly, even in the outermost white pixel portion having the minimum luminous intensity in the reference state in which white pixels are output through the entire light output area 33 of the image output unit 30, the cured light exceeding the curing threshold value is outputted .

When the curing light of the molded pixel 3a overlaid by the gray-scale pixel of the maximum grayscale concentration exceeds the curing threshold value, cured light exceeding the curing threshold value may be output in all the remaining portions.

If the maximum value of the grayscale density is set according to the deviation between the maximum luminous intensity and the minimum luminous intensity in the case where the lowest luminous intensity in the reference state exceeds the curing threshold value, The cured light of the luminous intensity exceeding the curing threshold value can be output. Accordingly, the forming material (r) of the forming portion (c) can be smoothly formed based on the curing light outputted through the formed forming pixel (3a).

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

100: stereolithography apparatus 10: hardening water tank
30: Image output unit 40: Molding stage
51: shaping control unit 52:
53: Optical walk government

Claims (5)

The modeling data corresponding to the three-dimensional structure is divided according to the predetermined lamination thickness, and the shaped pixels for irradiating the hardened light and the unshaped pixels for shielding the hardened light are divided according to the substantially formed regions of the divided sectional layers, A first step of setting an image;
A second step of gradating each of the formed pixels so that a luminous intensity distribution of an image forming unit in which the layer image is displayed is compensated; And
And a third step of sequentially displaying the processed layer images on the upper part of the image to form each cross-sectional layer corresponding to the three-dimensional structure. The method according to claim 1,
Wherein the grayscale image of the grayscale in which the grayscale concentration of each pixel is adjusted corresponding to the distribution of the luminous intensity distribution of each of the regions of the image forming portion so that the luminous intensity deviation of the cured light output through each of the molding pixels is compensated within a predetermined range, And overlaying the image on the layer image so that each of the formed pixels is corrected to a brightness distribution corresponding to a threshold value of the luminous intensity distribution of each area. 3. The method of claim 2,
Wherein the second step is a step of adjusting a maximum value of the grayscale density in accordance with a deviation between a maximum luminosity and a minimum luminosity of the image forming section so that a minimum shaping pixel value of the processed layer image exceeds a setting threshold of the shaping material Wherein the step of determining the shape of the three-dimensional structure comprises the steps of: The modeling data corresponding to the three-dimensional structure is divided according to the predetermined lamination thickness, and the forming pixels for irradiating the hardening light and the non-shaping pixels for blocking the hardening light are divided according to the substantial shaping regions of the divided sectional layers, A sectional image generating unit for setting an image;
A gradation image of a gray scale in which the grayscale concentration of each pixel is adjusted in correspondence with the distribution of luminous intensity for each area of the image forming section in which the layer image is displayed is set so that the luminous intensity deviation of the cured light outputted through each of the formed pixels is compensated within a predetermined range An optical walker for correcting each of the formed pixels by a brightness distribution corresponding to a threshold value of the luminous intensity distribution of each region through the layer image and the overlay of the gradation image;
An image output unit sequentially displaying the corrected layer images on the image formation unit so that each cross-sectional layer corresponding to the three-dimensional structure is formed;
A curing water tank in which a filling space is formed in which a molding material is stored, and the image forming unit is formed on one side of the image output unit opposite to the image output unit so that the molding material is cured; And
And a shaping stage arranged so as to cover the image forming portion and formed thereon, wherein the shaping stage is moved in the stacking direction of the sectional layers. 5. The method of claim 4,
Wherein the optical walker sets the maximum value of the grayscale concentration according to the deviation between the maximum luminous intensity and the minimum luminous intensity of the image forming part so that the minimum shaping pixel value of the corrected layer image exceeds the curing threshold value of the molding material A stereolithography device for three - dimensional structures.

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