JPH0540810A - Data format structure for optical forming device - Google Patents

Abstract

PURPOSE:To cope with the difference in data structure corresponding to plural basic elements such as free-form surface and profile shape when the data of a shape model prepared by a CAD system are taken into an optical forming device. CONSTITUTION:A standard interface format is constructed by data blocks 19 used as units, which is composed of an ID part 20 including an ID number identifying basic elements arranged at the head and a data part 21 including attribute data and coordinate value data corresponding to the basic elements following the ID part. As to the free curved surfaces, especially, a B-Spline curved surface and a Beizer curved surface can be equally dealt with regardless of the exression form of the curved surface by writing information indicating the patch structure of the curved surface in the data part 21. As to the profile shape of the shape model, a solid shape can be directly dealt with by writing the information of the start and end points of a fault cutting as well as the information including the number of profile lines in a same crosssection and coordinate value in the data part 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data format structure of an optical modeling apparatus for creating a three-dimensional shape model based on CAD data, and takes in data according to a plurality of data structures such as a free-form surface and contour data to obtain a three-dimensional shape. The formation can be performed with high accuracy, and the interface program between the CAD system and the optical modeling device is CAD.
It aims to provide a new data format structure that vendors and users can easily develop.

[0002]

2. Description of the Related Art An optical molding method is known in which a desired shape can be freely formed by irradiating a liquid photocurable resin material with a predetermined exposure beam.
There is one disclosed in Japanese Patent Publication No. 239921.

This type of apparatus forms a three-dimensional shape by irradiating an ultraviolet laser beam on the surface of an ultraviolet curable resin under computer control based on three-dimensional CAD data, and curing the resin in layers to laminate them. ..

[0004]

By the way, since the conventional optical modeling system does not support various types of data structures by three-dimensional CAD, three-dimensional formation is performed by taking in various types of shape data. The problem is that it is difficult.

That is, as the data structure, for example, various types are known that can handle specially a free-form surface (B-Spline surface or Beizer surface), a polyhedron (including triangular patches), a facet, a plane, a contour and the like. However, since the interface format is not standardized at the time of importing these data into the optical modeling system, the versatility is poor and it is an obstacle in utilizing the CAD data.

Although various interface formats for using three-dimensional CAD data have been proposed in the conventional system, a specific data format, for example, a polyhedron (or a triangle) is used when the data is taken into the optical modeling system. However, only the format related to the patch) can be handled, and high accuracy can not be obtained for the contour data, which is a disadvantage.

[0007]

Therefore, in order to solve the above-mentioned problems, according to the present invention, when data of a data structure corresponding to a plurality of basic elements relating to a shape model is taken into an optical modeling apparatus, a data group is converted into a data group. A block is used as a unit, an ID part including identification information that specifies the type of a basic element of a shape is arranged at the beginning of the data block, and then attribute data and / or coordinate data for the basic element indicated by the ID part is arranged. Place the data part that contains, especially the ID
If the identification information of the part indicates a free-form surface, the data part is arranged in the area describing the information indicating the patch structure of the curved surface. If the identification information of the ID part indicates the contour shape, the shape model is The attribute data part including the start position and the end position of the tomographic cutting and the coordinate data part including the number of contour lines on the same cross section and the coordinate value data are arranged in the data part.

[0008]

According to the present invention, a data group having a data structure corresponding to a plurality of basic elements relating to a shape can be applied to one standardized interface format and loaded into an optical modeling apparatus. Can be overcome, and since the data regarding the free-form surface and the contour shape can be directly handled as the basic elements of the shape, it is possible to obtain highly accurate contour data.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The data format structure of the optical modeling apparatus of the present invention will be described below with reference to the illustrated embodiments.

It is an object of the present invention to realize a system environment in which interface software can be easily developed on the CAD system side by providing a standard interface format capable of incorporating various data structures.

FIG. 16 schematically shows a configuration example 1 of the optical modeling apparatus.

Data concerning a shape model created by a three-dimensional CAD system (not shown) is first taken into the workstation 2 and then converted into contour line data representing a contour by software processing to further fill the inside of the contour. The converted raster data is transferred to the machine controller 3.

The machine controller 3 controls the scanning of the laser beam and the movement control of the stage in the ultraviolet curable resin tank based on the raster data sent from the workstation 2.

That is, after the ultraviolet laser beam from the laser oscillator 4 passes through the AOM (acousto-optic modulator) 5,
After receiving the change of the optical path, the focus control unit 6 and X
A laser scan control device 9 is provided so as to scan the liquid surface of the ultraviolet curing resin tank 8 via the Y scanner unit 7, and the laser scan control device 9 receives a command from the machine controller 3. , The AOM driver 10 controls the AOM 5, the focus control unit 6 and the XY scanner unit 7 control the rotation of the galvanometer mirror.

In addition, the stage 1 is placed in the ultraviolet curing resin tank 8.
In the elevator mechanism for moving 1 up and down, a nut 14 is screwed into a feed screw 13 rotated by a stepping motor 12, and the stage 1 moves as the nut 14 moves.
1 has a structure in which the nut 1 is moved in the vertical direction.
The machine controller 3 receives information from the scale unit 15 regarding the position detection of No. 4 and sends a control signal to the stepping motor 12 to control the positioning of the stage 11.

Reference numeral 16 is a temperature management control unit under the control of the machine controller 3 for maintaining the temperature of the liquefied ultraviolet curable resin material 17 in the ultraviolet curable resin tank 8 at a predetermined value by the high frequency induction heating method. It is provided in.

FIG. 17 shows a flow of producing a three-dimensional model by the three-dimensional CAD system and the optical modeling apparatus 1.

First, a shape model is created by a shape modeler in a three-dimensional CAD system.

When the data relating to the shape model is loaded into the optical modeling apparatus 1, since the format of the data output by various CAD systems is different, the standard interface format according to the present invention (hereinafter,
It is called "SC-FORM". ) Is converted to the format. This SC-FORM is a format in which an interface program for format conversion can be easily developed on the CAD system side, and its details will be described later.

Note that an interface-enabled CA is available.
Many D softwares (CADDS, CATIA, Fres
It is possible to extend to about 10 types including dam) and to expand in the future.

The shape data according to the SC-FORM is taken in via online or offline and subjected to slicing (cutting) processing and editing processing, and then the vector /
It is transferred to the machine controller 3 through the filling processing by raster conversion.

Then, the scanning of the laser beam and the movement of the stage 11 are repeated under the control of the machine controller 3 to produce a predetermined three-dimensional model by stacking the tomographic planes.

That is, in the modeling process of FIG.
When the ultraviolet laser beam scans the surface of the ultraviolet curable resin material 17 based on the shape data and draws a predetermined cross-sectional shape, the portion irradiated with the beam is cured and the first cross-section for one layer is the stage 11. Formed on.

Next, each time the stage 11 descends by one layer by the elevator mechanism, a cross section is formed by the laser beam, and as a result of stacking several thin cross sections, the three-dimensional model 18 is gradually formed. Go Finally, the stage 11 is pulled up from the UV-curing resin tank 8 and then UV-cured to give a solid model 1.
8 will be completed.

Next, the SC-FORM format structure will be described.

There are five basic elements of the surface model that can be handled by SC-FORM, as shown below, and different ID numbers (referred to as "ID") are given to each.

(1) Direct path ID = 10 (2) Free-form surface ID = 20 (3) Polyhedron ID = 21 (4) Facet ID = 22 (5) Plane ID = 23 Here, “direct path” is a contour. It means line information, and "free-form surface" means a curved surface that cannot be expressed by an analytical mathematical formula. Further, the "facet" refers to an aggregate of small pieces when a curved surface is approximated by a polygon.

The data according to the SC-FORM is text data (ASCII format), and as shown in FIG. 1, each data block is a unit of each ID block 20, 20 ,.・ ・
It is configured to have.

That is, the ID portion 20 is located at the head of the data block 19, and the data portion 21 is followed by the ID portion 20, and a number of such data blocks 19 are collected to form a file.

However, adopting a nested structure for the ID section 20 complicates the process and is not allowed. Therefore, when there are a large number of ID parts, it is preferable to arrange the data arranged for each ID number as much as possible.

FIG. 2 shows an example of the record structure of the ID section 20, which includes an ID number, a layer number and a tag name.

"Nnnn" following "ID =" represents an ID number (see the ID numbers in (1) to (5) above).

The "layer number" is a four-digit number specified on each tomographic plane, and the "tag name" is used to distinguishably represent a group of data in a data block. It is a name, and up to 12 characters can be specified.

A space (blank) or the like is used as the delimiter between the ID number, the layer number, and the tag name.

The structure of the data part 21 following the ID part 20 is I
Since the number varies depending on the D number, each case will be described individually.

FIG. 3 shows the record structure of the data block 22 regarding the direct path, and FIG. 4 shows the image of the direct path.

In FIG. 3, two quadrangular contour lines 23 and 24 included in one layer are shown, and in the direct path, the contour lines in a three-dimensional cross section are described.

The ID section 25 of the data block 22 composes one record by the ID number (= 10), the layer number and the tag name according to the above-mentioned rule.

The first two records 2 of the subsequent data section 26
Nos. 7 and 28 are assigned as parts including attribute data.

That is, in the first record 27, the file number, start coordinate, end coordinate, pitch, flag 1,
Flag 2 is described in this order.

Here, as shown in FIG. 5, the "start coordinates" and "end coordinates" are orthogonal to the axis of the shape model with reference to a certain axis (this is assumed to be the "Z axis"). The coordinates of the start point ZST and the coordinates of the end point ZEN at the time of cutting on a plane are respectively meant.

The "pitch" is a numerical value for designating the pitch at the time of cutting, that is, the fineness of cutting (FIG. 5).
"Pitch").

The flag 1 and the flag 2 are provided in advance in anticipation of an expansion function planned in the future, and for example, the cutting pitch is not set to a constant value and is coarse at one place and fine at another place. It is prepared to respond to requests such as changing the pitch.

The record 28 following the record 27 describes the number of direct paths in the cross section. For example, in FIG.
In the example of, there are two direct paths (23, 24).

Coordinate data sections 29, 29, ... Having a fixed format are arranged in the subsequent areas in accordance with the number of direct paths.

The coordinate data part 29 comprises a header part 30 and an actual data part 31. In the header part 30, the number of points of the direct path, the sub tag name, the flag 1 and the flag 2 are arranged in this order. ..

Here, "the number of points of the direct path"
Is the number of points selected for designating the shape of the contour line. For example, the contour line 24 in FIG. 4 designates a closed line figure by five points (in this case, the start point and the end point are Although they match, it is important to note that when counting the number of points, they are distinguished and treated as different points.)

Further, the "sub-tag name" is a tag name which belongs to the lower order of the tag name, and it can be understood that a plurality of these sub-tag names are collected to form one tag name.

The flags 1 and 2 are as described in the description record 27 of the attribute data.

The actual data section 31 is a section having the coordinate values of each point of the direct path as a series of data.

For example, the first direct pass (pass 1)
The X coordinate value, Y coordinate value, and Z coordinate value of each point are stored in record units in order from the first point.

If the number of direct paths is n, such coordinate data section 29 will be arranged by n pieces after the designated record of the number of direct paths.

In FIG. 4, the layer number is "1", the tag name is "DPATH", and the contour line 23 of one direct path (sub-tag name "PATH1") has 10 points P (i) (i = 1). Direct path (subtag name "PATH")
2 ") has five points Q (i) (i = 1
The following is an example of data when it is assumed that it is specified by (integer up to 5).

Example of data) # 1 ID = 10 1 DPATH1 # 2 1 0.0000 30.0000 1.14 0 0 # 3 2 # 4 10 PATH1 0 0 # 5 PX (1) PY (1) PZ ( 1) ----- (Omitted) --- # 14 PX (10) PY (10) PZ (10) # 15 5 PATH2 0 0 # 16 QX (1) QY (1) QZ (1) --- -(Omitted) ----- # 20 QX (5) QY (5) QZ (5) Here, "#n" means the nth record, and PX
(I), PY (i), and PZ (i) (i = 1 to 10 are integers) indicate the X coordinate value, Y coordinate value, and Z coordinate value of the point P (i), respectively, and QX (I), QY
(I) and QZ (i) (i = 1 to 5 is an integer) indicate the X coordinate value, the Y coordinate value, and the Z coordinate value of the point Q (i), respectively.

The direct path is convenient for handling a relatively simple shape. For example, when the cross-sectional shape is the same as in a square prism, the data related to the path on one layer is copied, It is easy to specify the number of times the same data will be repeated in succession and expand it in post-processing.

Next, the structure of the data block relating to the free-form surface will be described.

To express a free-form surface approximately by a mathematical expression,
The expression of the free-form curve is expanded to two dimensions, and the curved surface is divided into a plurality of patches (divided surfaces), and appropriate control points are set for a B-Spline curved surface that approximates each patch or a single curved surface patch. A Bezier curved surface that is given and approximated by using a predetermined weighting function corresponding to each control point is known, but in SC-FORM, B-Splin is used.
Any curved surface can be handled by converting the e curved surface into a single Bezier curved surface.

FIG. 6 shows the record structure of the data block 32 regarding the free curved surface, and FIGS. 7 to 9 show curved surface images.

In the example shown in FIG. 7, the curved surface 33 is divided into three in the L direction and is divided into two in the C direction to form six patches 34 (i) (i = 1 to an integer of 1 to 6). Boundaries 35 and 3 defined by the curved surface 33
6 and 37. The boundary line 35 across all patches is
A boundary that means that an entity exists inside it (hereinafter,
It is called the "inner boundary." ) For patches 34 (1) and 3
4 (4) and the boundary line 36 and the patch 34
The boundary line 37 located between (3) and 34 (6) is
A boundary that means that an entity exists outside it (hereinafter,
It is called the “outer boundary”. ) Is represented.

FIG. 8 shows one of the patches, and in this example, 5 × 5 control points C (i) (i = 1 to integer of 25) divided into 5 in the u and v directions are defined. FIG. 9 shows how to order the control points C (i).

The ID section 38 of the data block 32 constitutes one record of the ID number (= 20), the layer number and the tag name according to the above-mentioned rule.

The first record 40 of the subsequent data section 39
Is allocated as a storage area for the number of states indicating the patch structure, and the numbers of divisions in the L and C directions are described in this order. For example, in the case of FIG. 7, it is represented by "32".

In the subsequent areas, coordinate data portions 41, 41, ... Of control points having a fixed format are arranged according to the number of patches.

The coordinate data section 41 comprises a header section 42 and an actual data section 43. In the header section 42, the number of states of control points, layer names and patch names are arranged in this order.

Here, the "number of control point states" means
The arrangement state of the control points C (i) in the u and v directions is shown, for example, represented by "55" in FIG.

The “patch name” means each patch 34.
It is the name given to (i).

The actual data section 43 is a section having the coordinate value of each control point as a series of data.

For example, in order from the first control point,
The X coordinate value, Y coordinate value, and Z coordinate value of each control point are stored in record units.

When the number of patches is N, such coordinate data section 41 is arranged by N pieces after the designated record of the patch structure.

In the case of Bezier curved surface, "1 ×
The patch structure is "1", and the coordinate values of all control points are described in one coordinate data section.

The control point coordinate data portion 41 is followed by a record 44 indicating the number of inner boundaries and coordinate data portions 45, 45, ...

The header section 46 of the coordinate data section 45 has a structure in which the number of points, the layer number, and the boundary name are arranged in this order.

Here, the "number of points" means the number of points designating a boundary line, for example, the boundary line 35 in FIG.
Specifies a closed line figure by five points (in this case, the start point and the end point match, but note that when counting the number of points, the two are distinguished and treated as different points).

The "boundary name" is a name given to identify each boundary line.

The actual data section 47 of the coordinate data section 45 is a section having the coordinate values of each point as a series of data, and the X coordinate value of each point, in order from the first point,
The Y coordinate value and the Z coordinate value are stored in record units.

Such coordinate data parts 45 are arranged by the number of inner boundaries.

Then, a record 48 indicating the outer boundary,
The coordinate data section 49, 49, ... Concerning the outer boundary follows.

The header section 50 of the coordinate data section 49 has a record structure in which the number of points, the layer number, and the boundary name are arranged in this order.
Then, it is as described above.

The actual data section 51 of the coordinate data section 49 is a section having the coordinate values of each point as a series of data, and the X coordinate value of each point, in order from the first point,
The Y coordinate value and the Z coordinate value are stored in record units.

Incidentally, since the coordinate data part regarding such a boundary line is not required at the time of non-trim where the boundary is not designated, the number of inner boundaries and outer boundaries may be set to zero.

In FIG. 7, the layer number is "1" and the tag name is "BSU R1".
(I) (Name each patch as "BSURI" (I = 110 +
i). ) Has 25 control points C (i) (i =
The boundary line 35 indicating the inner boundary is specified by five points (the boundary name is “INBOND”), and the boundary lines 36 and 37 indicating the outer boundary are specified. Each is specified by 20 points (the boundary name is "OUTBOND
1 ”and“ OUTBOND2 ”. ) Is as follows.

Data example) # 1 ID = 20 1 BSUR1 # 2 3 2 # 3 5 5 1 BSU R111 # 4 CX (1) CY (1) CZ (1) ----- (omitted) ----- # 28 CX (25) CY (25) CZ (25) # 29 5 5 1 BSU R112 # 30 CX (1) CY (1) CZ (1) --- (omitted) ----- # 54 5 5 1 BSUR113 ----- (omitted) --- # 154 1 # 155 5 1 INBOND # 156 IX (1) IY (1) IZ (1) ----- (omitted) ----- # 160 IX (5 ) IY (5) IZ (5) # 161 201 OUTBOND1 # 162 OX (1) OY (1) OZ (1) ----- (omitted) --- # 180 OX (20) OY (20) OZ (20) # 181 20 1 OUTBOND2 # 82 oX (1) oY (1) oZ (1) --- (omitted) --- # 201 oX (20) oY (20) oZ (20) CX (i), CY (i), CZ (i) (i = 1 to 2
(Integer up to 5) is the X coordinate value of control point C (i), Y
The coordinate value and the Z coordinate value are shown respectively. Also, IX
(I), IY (i), and IZ (i) (i = 1 to 5 are integers) represent the X coordinate value, Y coordinate value, and Z coordinate value of each point of the inner boundary “INBOND”, respectively. OX
(I), OY (i), and OZ (i) (i = 1 to 25 is an integer) indicate the X coordinate value, Y coordinate value, and Z coordinate value of each point of the outer boundary "OUTBOND1", respectively, and oX
(I), oY (i), and oZ (i) (i = 1 to 25 are integers) respectively indicate the X coordinate value, the Y coordinate value, and the Z coordinate value of each point of the outer boundary “OUTBOND2”.

As described above, the SC-FORM can comprehensively handle various free-form surfaces having different expression formats, which makes it possible to create highly accurate contour line data, which is an important modeling in optical modeling. The accuracy of can be improved.

Next, the structure of the data block relating to the polyhedron will be described.

FIG. 10 shows the record structure of the data block 52 for the polyhedron, and FIG. 11 shows a triangular patch as an example of the polyhedron, with vertices P1, P2,
P3, P4 (however, point P1 and point P4 are the same point)
Specifies a triangular closed line figure.

In the ID section 53 of the data block 52, the ID number (= 21), the layer number and the tag name are arranged as promised, and the number of points for designating the closed line figure is described in the next record 54. After that, the actual data section 55 is arranged.

The actual data portion 55 is a portion having the coordinate values of each designated point of the polyhedron as a series of data, and the X coordinate value, Y coordinate value and Z coordinate value of each point are recorded in order from the first point. It is designed to be stored in units.

In FIG. 11, the layer number is "1",
An example of data when the tag name is “HPLN1” is as follows.

Example of data) Note that PXi, PYi, and PZi (i = 1 to 4 are integers) represent the X coordinate value, Y coordinate value, and Z coordinate value of the point Pi, respectively.

Next, the structure of the data block regarding the facet will be described.

FIG. 12 shows the record structure of the data block 56 for facets. Further, FIG. 13 shows an image of facets, and a closed line figure (triangle is a unit) is divided into a large number of point sequences (25 points Qi (i = 1) in each of the u and v directions). ~
The example is designated by an integer up to 25)).

In the ID portion 57 of the data block 56, I
D number (= 22), layer number, tag name are placed,
In the next record 58, the number of states indicating the arrangement of points is described, and then the actual data part 59 is arranged.

The actual data portion 59 is a portion having the coordinate value of each designated point of the facet as a series of data, and the X coordinate value of each point in order from the first point,
The Y coordinate value and the Z coordinate value are stored in record units.

Then, after the designation record 60 for the number of inner boundaries and the coordinate data portions 61, 61, ... Are arranged, the designation record 62 for the number of outer boundaries and the coordinate data portions 63, 63 ,.
... are arranged, but these have the same configuration as the coordinate data part of each boundary already described for the free-form surface.

In FIG. 13, the layer number is "1",
An example of data when the tag name is “FCT1” is as follows.

Example data) Note that QXi, QYi, and QZi (i = 1 to 25 are integers) indicate the X coordinate value, Y coordinate value, and Z coordinate value of each designated point Qi. Also, the data part regarding the boundary is omitted to avoid duplication of explanation.

Finally, the structure of the data block relating to the plane will be described.

FIG. 14 shows the record structure of the data block 64 for the plane. Further, in FIG. 15, boundary lines 66, 67, 68 are defined on the plane 65, the boundary line 66 represents the inner boundary, and the boundary lines 67, 68 represent the outer boundary.

In the ID portion 69 of the data block 64, I
D number (= 23), layer number, tag name are placed,
In the next two records 70 and 71, plane coefficients are described.

That is, the plane is expressed by the formula "A.x + B.y + C".
-Z = D ", the coefficients A, B, C, and D are grouped in twos and arranged in each record.

Then, in the next record 72, 1 on the plane
The X coordinate value, Y coordinate value, and Z coordinate value of the point are described.

Next, after the designation record 73 of the inner boundary number and the coordinate data portions 74, 74, ... Are arranged, the designation record 75 of the outer boundary number and the coordinate data portions 76, 76 ,.
... are arranged, but these have the same configuration as the coordinate data part of each boundary already described for the free-form surface.

In FIG. 15, the layer number is "1",
An example of data when the tag name is “PLN1” is as follows.

Data example) # 1 ID = 23 1 PLN1 # 2 A B # 3 C D # 4 RX RY RZ # 5 1 # 6 5 1 INBOND # 7 IX (1) IY (1) IZ (1) ----- (Omitted) ----- # 11 IX (5) IY (5) IZ (5) # 12 20 1 OUTBOND1 # 13 OX (1) OY (1) OZ (1) ----- (Omitted) ) -------- # 32 OX (20) OY (20) OZ (20) # 32 20 1 OUTBOND2 # 33 oX (1) oY (1) oZ (1) ----- (Omitted) ----- 52 oX (20) oY (20) oZ (20) --- (Omitted) -------- In addition, RX, RY, and RZ are the X coordinate value, Y coordinate value, and Z coordinate value of one point on the plane, respectively. Shows. Further, the description of the data part regarding the boundary is omitted to avoid duplication of description.

The SC-FORM is a standard interface format capable of dealing with a data structure corresponding to a plurality of basic elements (particularly, a free-form surface and a ring portion), and is easy for both computers and humans to understand. Since it has a format, the manufacturer of the optical modeling apparatus can easily develop the interface program by opening it to the CAD vendor or the user side, and the CA that the optical modeling apparatus can support.
The number of D can be increased.

[0106]

As is apparent from the above description, according to the present invention, data having various data structures having different basic elements of shape is converted into a standardized interface format. Since it can be incorporated into an optical modeling apparatus, there is no need to worry about data compatibility problems due to differences in CAD systems, and
Since the data block is composed of the ID part and the data part, and the identification information for distinguishing the difference between the basic elements is described in the ID part, the data structure is relatively simple, so that the interface program can be easily created. It is also highly expandable in the future.

Since the free-form surface and the contour data can be directly handled as the basic elements, the accuracy of the three-dimensional shape model to be produced can be guaranteed.

[Brief description of drawings]

FIG. 1 is a diagram showing a format structure according to the present invention.

FIG. 2 is a diagram showing a record structure of an ID part.

FIG. 3 is a diagram showing a structure of a data block related to a direct path.

FIG. 4 is a schematic diagram showing a graphic image regarding a direct path.

FIG. 5 is a diagram for explaining start coordinates and end coordinates.

FIG. 6 is a diagram showing a structure of a data block regarding a free-form surface.

FIG. 7 is a diagram showing a graphic image of a free-form surface.

FIG. 8 is a diagram showing a curved surface image of one patch.

FIG. 9 is a diagram for explaining the arrangement of control points.

FIG. 10 is a diagram showing a structure of a data block regarding a polyhedron.

FIG. 11 is a diagram showing a graphic image of a polyhedron.

FIG. 12 is a diagram showing the structure of a data block related to facets.

FIG. 13 is a diagram showing a graphic image regarding facets.

FIG. 14 is a diagram showing a structure of a data block regarding a plane.

FIG. 15 is a diagram showing a graphic image of a plane.

FIG. 16 is a diagram showing an outline of an optical modeling apparatus.

FIG. 17 is a diagram schematically showing the flow of production of a three-dimensional model.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical modeling device 17 Photocurable resin material 19 Data block 20 ID part 21 Data part 22 Data block 25 ID part 26 Data part 27, 28 Attribute data part 29 Coordinate data part 32 Data block 38 ID part 39 Data part 40 Area (Information indicating patch structure)

[Procedure amendment]

[Submission date] September 4, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction content]

In addition, the stage 1 is placed in the ultraviolet curing resin tank 8.
In the elevator mechanism for moving 1 up and down, a nut 14 is screwed into a feed screw 13 rotated by an AC servomotor 12, and the stage 11 moves as the nut 14 moves.
Has a structure in which the nut 14 is moved in the vertical direction.
The machine controller 3 receives information from the scale unit 15 regarding the position detection of the AC servo motor 12
Positioning control of the stage 11 is performed by sending a control signal to the.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

Further, the "sub tag name" is a tag name which belongs to a lower order of the tag name.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (3)

[Claims] 1. A data format structure in an optical modeling apparatus for forming a desired three-dimensional shape by forming cross sections by irradiating the surface of a liquid photocurable resin material with a beam and stacking these cross sections. When capturing data having a data structure corresponding to a plurality of basic elements related to a shape model, a data group is formed in units of data blocks, and an ID including identification information that specifies the type of the basic element of the shape is provided at the beginning of the data block. A data format structure in an optical modeling apparatus in which a data section including attribute data and / or coordinate data regarding a basic element indicated by the ID section is arranged. 2. In the data format structure of the optical modeling apparatus according to claim 1, when the identification information of the ID part indicates a free-form surface, an area for describing information indicating the patch structure of the curved surface is arranged in the data part. The data format structure in the optical modeling apparatus characterized by the above. 3. The data format structure in the optical modeling apparatus according to claim 1, wherein when the identification information of the ID part indicates a contour shape, an attribute data part including a start position and an end position of the tomographic cutting for the shape model. And a coordinate data section including the number of contour lines on the same cross section and coordinate value data are arranged in the data section, which is a data format structure in an optical modeling apparatus.