JP2017035807A - Light irradiation device and light irradiation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light irradiation device and a light irradiation method by which irradiation of light can be performed while controlling the light irradiating a surface of an irradiation target to give uniform or substantially uniform illuminance on the surface of the irradiation target.SOLUTION: A light irradiation device 10 includes: a stage 14 to be used for manufacturing an irradiation target; positioning means for specifying a position of the irradiation target; a plurality of light sources 16, 18 disposed above and below the irradiation target; reading means 20 for reading a three-dimensional molding data; acquiring means for acquiring a distance between each light source 16, 18 and the irradiation target from the three-dimensional molding data; calculating means for calculating luminosity of the light depending on the distance acquired by the acquiring means in such a manner that the light beams emitted from the respective light sources 16, 18 give uniform or substantially uniform illuminance on the surface of the irradiation target; and control means for controlling the light beams irradiating the irradiation target in such a manner that the light beams have the luminosity calculated by the calculating means and irradiate the target in the same timing.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light irradiation apparatus and a light irradiation method, and more particularly to a light irradiation apparatus and a light irradiation method for controlling the illuminance of light irradiated on the surface of an irradiation object.

  Conventionally, there has been known a light irradiation device for irradiating an irradiation object with light to process the surface of the irradiation object and curing a photo-curing material applied to the surface of the irradiation object. Yes.

  Patent Document 1 discloses a technique related to a so-called post-cure process as a process of completely curing a semi-cured resin for a three-dimensional model after stereolithography.

Such a post-cure process is not only a method for completely curing a semi-cured resin described in Patent Document 1, but also gives a gloss as a finishing process for a three-dimensional structure produced by stereolithography. It is also known as a technique.

  Here, FIGS. 1A, 1B, and 1C are schematic configuration explanatory views showing light irradiation in a conventional light irradiation apparatus.

  The conventional light irradiation apparatus shown in FIG. 1A irradiates light from both the upper side and the lower side of the irradiation object.

  Here, the light irradiation means in the conventional light irradiation apparatus uses, for example, a light emitting diode (LED) as a light source. In the case shown in FIG. 1 (a), the luminous intensity of the light emitted from the upper light source arranged on the upper side of the plate-like irradiation object having a uniform thickness as a whole and the lower side of the irradiation object. Place the irradiation object between the upper light source and the lower light source so that the luminous intensity of the light source irradiated from the lower light source is the same and the same illuminance on the surface of the irradiation object. If light is irradiated simultaneously from the light source, the surface of the irradiation object is irradiated with light at the same timing with uniform illuminance.

  In addition, since the photo-curing material used in the conventional three-dimensional modeling contracts due to curing, as shown in FIG. 1A, the illumination intensity is uniform on the upper surface and the lower surface of the irradiation object. If the light is irradiated and the whole irradiation object is cured at almost the same timing, the photocuring material that is the material of the irradiation object is uniformly shrunk, resulting in a uniform finish without distortion or deformation. .

  On the other hand, as shown in FIG. 1B, when the luminous intensity of the light emitted from the upper light source and the luminous intensity of the light emitted from the lower light source are different from each other, the photocuring material on the surface of the irradiation object is cured. There is a difference in speed.

More specifically, even if the distance between the upper light source and the upper surface of the object to be irradiated is the same as the distance between the lower light source and the lower surface of the object to be irradiated, and irradiation is performed at the same timing, When the light intensity of the lower light source is lower than the light intensity of the upper light source, a difference occurs in the illuminance of the light irradiated on the irradiation target surface. Due to the difference in illuminance between the upper side and the lower side of the irradiation object on the surface of the irradiation object, the upper side is hardened more quickly than the lower side of the irradiation object. Thus, when a difference in curing speed occurs between the upper side and the lower side, there is a problem that the irradiation object is deformed into a warped shape.

  Therefore, as shown in FIG. 1 (a), the light intensity of the upper light source and the light intensity of the lower light source may be adjusted to irradiate. However, as shown in FIG. If the object has a flat surface with a uniform surface, the distance between the upper light source and the upper surface of the object to be irradiated is the same as the distance between the lower light source and the lower surface of the object to be irradiated. By arranging the target object and irradiating with the same timing and adjusting the luminous intensity of the upper light source and the lower light source to be the same, the illuminance of the light becomes uniform on all surfaces of the irradiation target object It is easy to irradiate light.

However, the three-dimensional structure often has a complicated concavo-convex shape, and there is a problem that it is not easy to irradiate light so that all surfaces of the irradiation object have the same illuminance.

  Here, FIG.1 (c) shows the conventional light irradiation apparatus in the case of irradiating light to the irradiation target object which has an uneven | corrugated shape.

  As shown in FIG.1 (c), in the conventional light irradiation apparatus, an irradiation target object is mounted on the stage comprised from a transparent material, and the upper light source arrange | positioned above an irradiation target object, and a stage Light is irradiated by a lower light source disposed on the lower side.

  In addition, as a transparent material which comprises a stage, the acrylic board which consists of an acrylic resin which permeate | transmits light is used, for example.

  An irradiation object having the shape shown in FIG. 1C is placed on a stage made of such an acrylic plate, and the same luminous intensity and the same from the upper side and the lower side by a plurality of upper and lower light sources arranged. Consider the case of light irradiation at the timing.

  First, considering the upper side of the irradiation object, the irradiation object shown in FIG. 1 (c) has a high part and a low part in the height direction. There is a difference in the illuminance of the light irradiated at the lower part. More specifically, since the distance from the upper light source is short in the high part, the illuminance of the light irradiated on the surface is high and the curing speed is high compared to the low part. On the other hand, since the distance to the upper light source is longer in the low part than in the high part, the illuminance of the light irradiated on the surface is lower than in the high part, and the curing speed is slow.

  Differences in the curing rate, such as the photocuring material being cured quickly at the high part and the photocuring material being cured slowly at the low part, cause distortion and cracking of the three-dimensional structure.

  Next, considering the lower side of the irradiation object, the irradiation object shown in FIG. 1C is placed on a stage made of an acrylic plate. Therefore, in the case of the irradiation object shown in FIG.1 (c), the whole area of the lower surface of an irradiation object becomes the overlapping area | region which overlaps and contacts the acrylic board which is a stage, and light is irradiated through an acrylic board.

  Even when the lower light source emits light having the same luminous intensity as the upper light source, the lower surface of the irradiation object is irradiated with light whose intensity has been attenuated due to interference by the acrylic plate.

Therefore, compared with the case of the upper side of the irradiation object that is directly irradiated with light from the upper light source, the lower surface, which is the overlapping region, has a slower curing speed, and therefore processing such as additional light irradiation only from the lower light source. Although necessary, such additional light treatment could cause cracking.

  As shown above, when light is radiated on a three-dimensional structure by a conventional method, the shape of the object to be irradiated and the light of the same luminous intensity are radiated from the upper light source and the lower light source at the same timing. There is a problem in that the illuminance of light reaching the surface of the irradiation object varies due to the influence of the stage interference, causing warping, deformation, and cracking due to differences in the degree of curing.

  In addition, there is a problem that even if the object to be irradiated after light irradiation is not warped, deformed, or cracked, there is a difference in the finish such as gloss on the surface of the object to be irradiated.

JP-A-8-252866

  The present invention has been made in view of the above-described various problems of the prior art, and the object of the present invention is to irradiate light on the surface of the irradiation object uniformly or on the surface of the irradiation object. An object of the present invention is to provide a light irradiation apparatus and a light irradiation method capable of performing light irradiation by controlling the illumination intensity to be substantially uniform.

In order to achieve the above object, the present invention provides a uniform or substantially uniform surface on an irradiation object using information obtained from the shape of the irradiation object for each of a plurality of light sources that irradiate light on the surface of the irradiation object. The light intensity of the illuminance is calculated, and each light source is controlled so that light irradiation is performed with the light having the calculated light intensity.

  That is, the present invention relates to a plate made of a transparent material in a light irradiation apparatus that irradiates predetermined light to an irradiation object produced by three-dimensional modeling based on three-dimensional modeling data representing the shape of the irradiation object. A stage, which is used for producing an irradiation object when performing three-dimensional modeling, a positioning means for specifying the position of the irradiation object produced on the stage, and the irradiation object A plurality of light sources disposed on at least the upper side and the lower side of the object, and irradiating the irradiation object with light; and reading means for reading the three-dimensional modeling data of the irradiation object into the light irradiation apparatus; For each light source of the plurality of light sources, acquisition means for obtaining the distance between each light source and the irradiation object from the three-dimensional modeling data read by the reading means, and each light source of the plurality of light sources The light sources of the plurality of light sources irradiate according to the distances obtained from the acquisition means so that the irradiated light has uniform or substantially uniform illuminance on the surface of the irradiation object. Calculating means for calculating the luminous intensity of the light to be emitted, and the light emitted by the light sources of the plurality of light sources to the irradiation object become the luminous intensity of the light respectively calculated by the calculating means, and at the same timing And a control means for controlling the irradiation.

  Further, the present invention is the above-described invention, wherein the positioning means is a plate-like body made of a transparent material disposed in the light irradiation device, and has a table on which the stage is placed. The stage has stage position fixing means for fixing the position with respect to the table, the table has an alignment reference corresponding to the stage position fixing means, and the stage is placed on the table together with the irradiation object. When mounting on the stage, the position of the irradiation object on the stage can be specified by aligning the stage position fixing means with the alignment reference.

  Further, the present invention is the above-described invention, wherein the light irradiation device includes a scanner that reads an entire shape of the irradiation object placed on the stage and obtains scan data of the irradiation object, The alignment means specifies the position of the irradiation object produced on the stage using the scan data.

  In addition, the present invention provides a light irradiation method that uses a light irradiation device that irradiates predetermined light to an irradiation object produced by three-dimensional modeling based on three-dimensional modeling data representing the shape of the irradiation object. The position of the irradiation object produced on the stage on a stage used for producing the irradiation object, and at least of the irradiation object A light irradiation method for irradiating light to the irradiation object from a plurality of light sources arranged on the upper side and the lower side, wherein the position of the irradiation object created on the stage is specified A matching step, a reading step of reading the three-dimensional modeling data of the irradiation object, and a distance between each of the light sources and the irradiation object is read by the reading means for each light source of the plurality of light sources. Obtained from the obtaining means such that the obtaining step obtained from the three-dimensional modeling data and the light emitted from the light sources of the plurality of light sources have uniform or substantially uniform illuminance on the surface of the irradiation object, respectively. In accordance with the respective distances, a calculation step of calculating the intensity of light emitted by the light sources of the plurality of light sources, and the light emitted by the light sources of the plurality of light sources on the irradiation object, And a control step for performing control so that the light intensity of the light calculated in the calculation step is applied at the same timing.

  Since the present invention is configured as described above, it is possible to perform light irradiation by controlling the light irradiated onto the surface of the irradiation object to have uniform or substantially uniform illuminance on the surface of the irradiation object. There is an excellent effect of becoming.

1A, 1B, and 1C are schematic configuration explanatory views showing an example of a light irradiation method in a conventional light irradiation apparatus. FIG. 2 is a schematic configuration perspective view showing an example of an embodiment of a light irradiation apparatus according to the present invention. 3 (a) and 3 (b) are schematic configuration perspective views illustrating the state of the stage of the light irradiation apparatus according to the present invention. FIGS. 4A, 4B, 4C, and 4D are schematic configuration perspective views illustrating a procedure of pre-processing applied to an irradiation object before performing light irradiation in the light irradiation apparatus according to the present invention. 5 (a) and 5 (b) are schematic explanatory views for explaining calculation of illuminance on the surface of an irradiation object in the light irradiation apparatus according to the present invention. FIG. 6 is a flowchart showing the processing contents of the light irradiation process performed by the light irradiation apparatus according to the present invention. FIGS. 7A, 7B, 7C, and 7D illustrate an example of another embodiment of the light irradiation apparatus according to the present invention, and the distance from the light source to the irradiation object is determined by the scan data. It is schematic structure perspective explanatory drawing which showed the procedure to do. FIGS. 8A and 8B are schematic explanatory views for explaining an example of another embodiment of the light irradiation apparatus according to the present invention.

Hereinafter, an example of an embodiment of a light irradiation apparatus and a light irradiation method according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 2 shows a schematic configuration explanatory diagram of an example of a light irradiation apparatus according to the present invention.

  A light irradiation apparatus 10 according to the present invention includes a stage 14 on which an irradiation target is placed in a cube-shaped housing 12 and a ceiling portion 12 a of the housing 12 in the housing 12. An upper light source 16 that emits light from above the irradiation object, a lower light source 18 that is disposed on the bottom surface portion 12b of the housing 12 in the housing 12 and emits light from below the stage 14, and an irradiation object And a scanner 20 for scanning the shape of the object.

  More specifically, the housing 12 includes a ceiling portion 12a, a bottom surface portion 12b, and side portions 12L and 12R which are the left and right side surfaces of the housing 12.

  And the stage 14 which mounts an irradiation target object in the light irradiation apparatus 10 is a plate-shaped body horizontally arrange | positioned between the side part 12L and the side part 12R, Comprising: Both ends of the stage 14 are side. Removably fixed to the side portions 12L and 12R, respectively.

  In the present embodiment, the upper light source 16 uses an LED array in which a plurality of LED light sources are arranged between the side portion 12R and the side portion 12L. Twelve ceiling portions 12a are arranged so that the irradiation object on the stage 14 can be irradiated with light.

  The lower light source 18 uses an LED array in which a plurality of LED light sources are arranged between the side portion 12R and the side portion 12L as in the upper light source 16, and is disposed on the bottom surface portion 12b of the housing 12. The irradiation object on the stage 14 is irradiated with light from below the stage 14.

  The scanner 20 is disposed above the housing 12 so as to be positioned between the upper light source 16 and the irradiation object.

  The scanner 20 is slidably disposed on the two rails 22-1 and 22-2 that connect the side portions 12L and 12R.

  Note that the overall operation of the light irradiation apparatus 10 described above is controlled by the microcomputer 24.

Further, the light irradiation device 10 can acquire data such as three-dimensional modeling data from the outside under the control of a microcomputer.

  Next, the stage 14 will be described in detail with reference to FIGS.

The stage 14 includes a stage unit 14a and a table unit 14b. In the present embodiment, an acrylic resin that transmits light is used as the material of the stage portion 14a and the table portion 14b constituting the stage 14.

  3A is a schematic perspective view illustrating a state before the stage portion 14a is attached to the table portion 14b, and FIG. 3B is a view after the stage portion 14a is attached to the table portion 14b. The schematic structure perspective view shown is shown.

  The stage unit 14 a is a substantially plate-like body for the purpose of placing an irradiation object, and is detachably disposed on a table unit 14 b disposed in the light irradiation device 10. Further, two stage alignment protrusions 14aa are provided at the lower end portion on the front side of the stage portion 14a. The stage positioning convex portion 14aa serves as a reference for the stage position on the table portion 14b when it is arranged on the table portion 14b, and is intended to align the stage portion and the table portion.

  Next, the table portion 14b is a substantially plate-like body, and the stage portion 14a can be disposed on the upper surface thereof.

  Further, on the front side surface of the table portion 14b, two stage alignment concave portions 14ba each having a shape that meshes with the stage alignment convex portion 14aa of the stage portion 14a are provided by being cut out.

  FIG. 3B shows a state in which the stage portion 14a is arranged on the table portion 14b. When the stage portion 14a is arranged on the table portion 14b, the stage alignment convex portion 14aa of the stage portion 14a becomes the table portion. It fits in 14b stage alignment recessed part 14ba, and will be located so that the front side surface of the stage part 14a and the front side surface of the table part 14b may correspond on the same surface.

  By aligning the front side surface of the stage alignment convex portion 14aa described above with the front side surface of the stage alignment concave portion 14ba, the position of the irradiation target object on the stage 14 in the light irradiation apparatus 10 is determined. Can be defined.

  Moreover, although mentioned later, the irradiation target object mounted in the stage 14 may be produced based on 3D modeling data in the conventional 3D modeling apparatus.

  By using the three-dimensional modeling data for producing the irradiation object, the shape of the irradiation object can be acquired and the light intensity of the light irradiated in the light irradiation apparatus 10 according to the present embodiment is determined. It is possible to obtain the distance values from the upper light source 16 and the lower light source 18 to the irradiation object at the required light irradiation position of the irradiation object on the stage 14.

That is, by aligning the stage alignment convex portion 14aa with the stage alignment concave portion 14ba, a point that has been used as a reference in the 3D modeling apparatus during 3D modeling, for example, the position of the origin or the like is irradiated with light. The apparatus 10 can also be used as a reference, and the distance from the upper light source 16 and the lower light source 18 to the irradiation object can be acquired using the three-dimensional modeling data.

  Further, as a method for obtaining the distance from the upper light source 16 and the lower light source 18 to the irradiation object, in addition to the above method, the irradiation object is placed using the scanner 20 after the irradiation object is placed on the stage 14. Can be used to detect the position of the irradiation object and acquire the distances from the upper light source 16 and the lower light source 18 to the irradiation object based on the detection result.

  Information obtained by scanning by the scanner 20 is appropriately referred to as “scan data”.

In addition, the scanner 20 uses what can acquire the whole shape of the irradiation target object in the light irradiation apparatus 10. FIG.

In the present embodiment, the distances from the upper light source 16 and the lower light source 18 to the irradiation object can be obtained by the various methods described above, and these distances are used for calculating the illuminance of the irradiation object described later. Then, the light intensity in the upper light source 16 and the lower light source 18 is calculated from the illuminance, and the light of the calculated light intensity is irradiated from the upper light source 16 and the lower light source 18 at the same timing, so that the surface of the irradiation object is uniform or substantially uniform. It becomes possible to irradiate light with the illuminance.

  In the above configuration, a procedure for performing light irradiation on the irradiation object in the light irradiation apparatus 10 will be described in detail below.

  4A, 4 </ b> B, 4 </ b> C, and 4 </ b> D are schematic configuration perspective views for explaining a procedure of pre-processing performed on an irradiation object before performing light irradiation in the light irradiation apparatus 10. .

  In addition, what was modeled by the conventionally well-known three-dimensional modeling apparatus (not shown) is used for the irradiation target object which irradiates light in the light irradiation apparatus 10 by this Embodiment.

  As shown in FIG. 4A, the irradiation object is formed on the stage unit 14a by arranging the stage unit 14a used in the light irradiation apparatus 10 on a table arranged in the three-dimensional modeling apparatus.

  That is, by making the stage part used when modeling the irradiation object in the conventional three-dimensional modeling apparatus and the stage part 14a used when irradiating the light with the light irradiation apparatus 10 have the same size and structure. The position of the irradiation object to be shaped on the stage unit 14a can be defined. That is, first, a three-dimensional structure that is an irradiation target is formed on a stage unit used in the three-dimensional modeling apparatus. Next, the completed three-dimensional structure is taken out together with the stage part, and the three-dimensional structure is attached to the light irradiation apparatus having the stage part 14a having the same size and structure as the stage part used in the three-dimensional modeling apparatus. To do. By carrying out like this, the origin position of the three-dimensional structure in a three-dimensional modeling apparatus and the origin position of the three-dimensional structure in a light irradiation apparatus can be made to correspond. In this way, also in the light irradiation apparatus, the modeling data of the three-dimensional structure used in the three-dimensional modeling apparatus can be used in common.

  The table disposed in the three-dimensional modeling apparatus is provided with two stage alignment recesses having the same shape as the stage alignment recess 14ba of the light irradiation device 10, similarly to the table portion 14 b of the light irradiation device 10. The stage portion 14a is engaged with the two stage alignment protrusions 14aa.

  When modeling a 3D model in the 3D modeling apparatus, the stage unit 14a is attached to the table unit of the 3D modeling apparatus, and the lower surface side of the table unit of the 3D modeling apparatus is fixed with a fixing screw. And the stage part 14a is arrange | positioned in the table part of a three-dimensional modeling apparatus.

In this manner, the irradiation object is modeled in the three-dimensional modeling apparatus.

  Next, the irradiation object for which modeling has been completed is removed from the three-dimensional modeling apparatus together with the stage unit 14a (see FIG. 4B).

  That is, the connection between the stage unit 14a and the table unit of the 3D modeling apparatus by the fixing screw is released, and the stage unit 14a is removed from the 3D modeling apparatus.

Next, the irradiation object modeled on the stage unit 14a is washed. As an example of the cleaning method, a conventional cleaning method may be used. For example, as shown in FIG. 4C, a cleaning container poured with a cleaning liquid such as ethanol is prepared, and the cleaning container is placed on the stage 14a. Alternatively, the object to be irradiated may be immersed and cleaned.

  Next, the irradiation object that has been cleaned is placed in the light irradiation device 10.

  Specifically, as shown in FIG. 4D, the stage unit 14 a is arranged on the table unit 14 b included in the light irradiation device 10. The stage portion 14a and the table portion 14b may be fixed with screws (not shown).

  At this time, the stage positioning concave portion 14ba of the table portion 14b and the stage positioning convex portion 14aa of the stage portion 14a are engaged with each other, and the stage portion 14a is disposed on the table portion 14b.

In the present embodiment, the stage portion 14a has a stage alignment convex portion 14aa, and the table portion 14b has a stage alignment concave portion 14ba. Although alignment with the table portion 14b is performed, a mark may be attached to the stage portion 14a and the table portion 14b, respectively, and alignment may be performed using the mark as a reference.

Then, the irradiation object placed on the stage unit 14a is irradiated with light using the upper light source 16 and the lower light source 18. Below, the light irradiation method used in that case is demonstrated.

  Here, Fig.5 (a) has shown the schematic explanatory drawing for demonstrating the type | formula for calculating the illumination intensity in the irradiation target object surface regarding light irradiation.

As shown to Fig.5 (a), light shall be irradiated to an irradiation target object using the light source which irradiates the light of luminous intensity I [cd]. In this case, if the illuminance of light irradiated from the light source to the irradiation target surface is E [lx], the distance from the light source to the irradiation target is d [m], and the light incident angle is θ [rad], the irradiation is performed. The illuminance E of light on the surface of the object is

E = (I / d ² ) cos θ Formula (1)

It can be expressed as.

Formula (1) is a well-known one, and is obtained, for example, from “Construction Equipment Foundation” by Kenichi Kimura.

  Next, based on Formula (1), the illumination intensity in the irradiation target object surface in the case of irradiating light to an irradiation target object in the light irradiation apparatus 10 by this Embodiment is demonstrated.

  Here, FIG. 5B is a schematic explanatory diagram for explaining the illuminance of light on the surface of the irradiation object irradiated with light in the light irradiation device 10.

In the light irradiating apparatus and the light irradiating method in the present embodiment, the light emitted from the upper light source 16 and the lower light source 18 does not consider the diffusion of light, and goes straight from the upper light source 16 and the lower light source 18. Thus, only the light irradiated to the irradiation object is considered. That is, in FIG. 5B, the light emitted from the upper light source 16 and the lower light source 18 both irradiates light that goes straight to the irradiation object, and the light is irradiated in the vertical direction.

_First , the light having the luminous intensity I ₁ emitted from the upper light source 16 in FIG. 5B will be described. When light of intensity I ₁ is irradiated perpendicularly to the irradiated object, it is irradiated on the high part of the irradiation target object. It is assumed that the illuminance of the light irradiated to the high part is E ₁ , the distance from the upper light source 16 having the luminous intensity I ₁ to the high part of the irradiation object is d ₁ , and the light incident angle θ = 0. From equation (1), cos θ = 1 because the incident angle θ = 0 of light,

E ₁ = I ₁ / d ₁ ² Formula (2)

It can be expressed as.

Similarly, with respect to the light having the luminous intensity I ₂ irradiated from the upper light source 16 in FIG. 5B, when the light having the luminous intensity I ₂ is irradiated perpendicularly to the irradiation object, the light is irradiated to the lower part of the irradiation object. Irradiated. It is assumed that the illuminance of the light irradiated to the low part is E ₂ , the distance from the upper light source 16 having the luminous intensity I ₂ to the low part of the irradiation object is d ₂ , and the light incident angle θ = 0. From equation (1), cos θ = 1 because the incident angle θ = 0 of light,

E ₂ = I ₂ / d ₂ ² Formula (3)

It can be expressed as.

Next, the light having the luminous intensity I ₃ irradiated from the lower light source 18 in FIG. 5B is irradiated from the lower surface side of the irradiation object.

  Since the light irradiated to the irradiation object from the lower surface side reaches the lower surface portion of the irradiation object through the acrylic plate constituting the stage 14, it is necessary to consider the light attenuation rate by the stage 14. .

The illuminance of the light irradiated on the lower surface portion is E ₃ , the distance from the lower light source 18 having the luminous intensity I _{3 to} the lower surface portion of the irradiation object is d ₃ , the light incident angle θ = 0, and the light attenuation by the stage 14 Let the rate be W. From equation (1), cos θ = 1 because the incident angle θ = 0 of light,

E ₃ = I ₃ / d ₃ ² × W Formula (4)

It can be expressed as.

For formula (2), formula (3), and formula (4), as an example, d ₁ = 10 mm (1 × 10 ⁻² m), d ₂ = 20 mm (2 × 10 ⁻² m), d ₃ = 15 mm ( 1.5 × 10 ⁻² m) and the attenuation rate W = 0.90 of the stage 14 is shown below.

in this case,

E ₁ = I ₁ ^{-10 -4} Formula (5)
_{E 2 = I 2/4 ×} 10 -4 ··· formula (6)
E ₃ = (I ₃ /2.25×10 ⁻⁴ ) × 0.90 (7)

It becomes.

  Next, using the formula (5), the formula (6), and the formula (7), the upper light source 16 and the lower light source 18 are irradiated so as to have uniform illuminance on the surface of the irradiation object. The light intensity of light emitted from the light source 16 and the lower light source 18 is obtained.

That is, the luminous intensity I ₁ and luminous intensity I when the illuminances E ₁ , E ₂ , and E ₃ shown in the expressions (5), (6), and (7) satisfy the relationship E ₁ = E ₂ = E _{3. 2} and the light intensity I ₃ are calculated, and the light with the calculated light intensity is irradiated, so that the light irradiated from the upper light source 16 and the lower light source 18 is light with uniform or substantially uniform illuminance on the surface of the irradiation object. Become.

_First , assuming that the luminous intensity I ₁ , luminous intensity I ₂ , and luminous intensity I ₃ are all the same value, the illuminance value becomes the minimum when the expressions (5), (6), and (7) are compared. Choose one. The light intensity with the minimum illuminance value is set to 1 [cd] (100%), and each light intensity is determined based on this light intensity.

That is, other values are calculated so that the luminous intensity of the light applied to the portion of the irradiation target that has the smallest illuminance and is the most difficult to irradiate has the highest value.

In the formula (5), the formula (6), and the formula (7), the illuminance E ₂ of the light having the luminous intensity I _{2 in} the formula (6) is minimized, so that I ₂ = 1 in the formula (6)

E ₂ = 1/4 × 10 ⁻⁴ Formula (8)

It expresses.

Next, using the value of illuminance E ₂ obtained by Expression (8), the light intensity is calculated so that the illuminance values of other expressions also have the same value as E ₂ .

First, when calculating the luminous intensity I ₁ of the light source of the formula (5), the formula (5) and the formula (8) are used.

^{_{I 1/10 -4 = 1/}} 4 × 10 -4
I ₁ = 0.25 [cd] (9)

Is obtained.

Then, when calculating the light intensity _{I 3} of the light source of the formula (7), using Equation (7) and (8),

(I ₃ /2.25×10 ⁻⁴ ) × 0.90 = 1/4 × 10 ⁻⁴
I ₃ = 0.625 [cd] (10)

Is obtained.

From the values calculated in the above, the illuminances E ₁ , E ₂ , E ₃ of the light on the irradiation object irradiated with light of the luminous intensity I ₁ , I ₂ , I ₃ from the upper light source 16 and the lower light source 18 are made uniform. In order to obtain illuminance (E ₁ = E ₂ = E ₃ ), when the luminous intensity I ₂ is 1 [cd], the luminous intensity I ₁ is 0.25 [cd] and the luminous intensity I ₃ is 0.625 [cd]. Therefore, the light intensity I ₁ , I ₂ , I ₃ may be irradiated so that the ratio is I ₁ : I ₂ : I ₃ = 0.25: 1: 0625.

In the light irradiation apparatus 10 by this Embodiment, light irradiation is performed to an irradiation target object using the luminous intensity calculated by said method.

In addition, as described above, in the light irradiation device 10 according to the present embodiment, the distance d from the light source to the irradiation target object is the three-dimensional modeling data at the time of modeling the irradiation target object by the three-dimensional modeling apparatus. The distance d may be determined based on this.

  A method for determining the illuminance of light irradiated on the irradiation object and the light irradiation processing will be described with reference to a flowchart showing the processing contents of the light irradiation processing performed by the light irradiation apparatus 10 shown in FIG.

  First, the irradiation object modeled in the three-dimensional modeling apparatus is attached to the table unit 14b of the light irradiation apparatus 10 while being placed on the stage unit 14a.

  At this time, the stage unit 14a and the table unit 14b are aligned.

When the irradiation object is arranged in the light irradiation apparatus 10, the light irradiation process shown in FIG. 6 is started.

  First, in step S602, processing for reading the three-dimensional modeling data of the irradiation object is performed.

Here, the three-dimensional modeling data used when the irradiation object is formed in the three-dimensional modeling apparatus is read into the light irradiation apparatus 10.

  Next, in step S604, the distance between the upper light source 16 and the lower light source 18 with the irradiation object is acquired using the three-dimensional modeling data read in step S602.

  Then, in step S606, using the distance acquired in step S604, the light intensity of the upper light source 16 and the lower light source 18 having uniform or substantially uniform illuminance on the surface of the irradiation object is calculated.

  In step S608, the light of the luminous intensity calculated in step S606 is irradiated from the upper light source 16 and the lower light source 18 onto the irradiation object at the same timing.

Thereby, light is irradiated to the irradiation object surface with uniform or substantially uniform illuminance.

As described above, in the light irradiation apparatus 10 according to the present invention, the upper light source emits light having a light intensity calculated so that the illuminance of light irradiated to the irradiation object is uniform or substantially uniform on the surface of the irradiation object. 16 and the lower light source 18 were used for irradiation.

  Thereby, in the light irradiation apparatus 10 by this invention, dispersion | variation does not arise in the illumination intensity of the light irradiated to an irradiation target object, but it is possible to prevent the curvature by the difference in hardening degree, a deformation | transformation, and a crack.

Moreover, in the light irradiation apparatus 10 by this invention, it is possible to make the finish of gloss etc. in the irradiation target object surface uniform.

  The embodiment described above can be modified as shown in the following (1) to (7).

(1) In the above-described embodiment, the method of calculating the luminous intensity using the three-dimensional modeling data when calculating the distance between the upper light source and the lower light source and the irradiation object has been described. Of course, it is not a thing, and the method of calculating the distance between the upper light source and the lower light source and the irradiation object using the scan data may be used, or the 3D modeling data of the irradiation object and the scan data may be used. You may make it calculate the distance of an irradiation target object with an upper light source and a lower light source combining both.

When calculating the luminous intensity using the scan data, instead of reading the three-dimensional modeling data shown in step S602 in the flowchart shown in FIG. 6, the scan data of the irradiation object obtained by the scanner 20 is acquired, and step S604 is executed. As a process corresponding to the above, the distances between the upper light source and the lower light source and the irradiation object may be acquired from the scan data, and then the processes shown in step S606 and step 608 may be performed.

  Moreover, when calculating a luminous intensity using 3D modeling data and scan data, it is performed by the method shown in FIG. 7, for example.

  Here, it demonstrates below, showing the schematic structure perspective explanatory drawing explaining the procedure which determines the distance d using the three-dimensional modeling data and scan data which are shown to Fig.7 (a) (b) (c) (d). To do.

  First, the irradiation object is placed on a stage unit having an alignment unit, and the stage unit is aligned and mounted on the alignment reference of the table unit (see FIG. 7A).

  Next, the irradiation object is scanned by the scanner 20 to obtain scan data (see FIG. 7B).

  And in the light irradiation apparatus 10, it is possible to obtain the information regarding the detailed shape of an irradiation target object by collating the three-dimensional modeling data used at the time of modeling with the scan data acquired in FIG.7 (b). . Note that information regarding the detailed shape of the irradiation object acquired by collating the three-dimensional modeling data and the scan data is appropriately referred to as “detailed shape data”.

  By using such detailed shape data, a more accurate distance from the upper light source 16 and the lower light source 18 to the irradiation object can be obtained.

  Since the technique for obtaining detailed shape data is a known technique, the description thereof will be omitted. For example, JP-A-11-101603, JP-A-2007-40940, and JP-A-2007-40940 are described above. The techniques disclosed in 2009-210509, JP2011-133327A, and JP2011-133328A can be used.

  That is, in the case shown in FIG. 7C, the three-dimensional modeling data and the scan data are collated, the position and the angle are recognized in the three-dimensional modeling data, and detailed shape data of the irradiation object is acquired.

  Next, using the detailed shape data, the distance between the upper light source 16 and the lower light source 18 from the irradiation object is acquired, and the upper light source 16 having uniform or substantially uniform illuminance on the surface of the irradiation object from the distance. And the luminous intensity of the light of the lower light source 18 is calculated.

  Then, as shown in FIG. 7 (d), the irradiation object is irradiated with light of the calculated luminous intensity from the upper light source 16 and the lower light source 18 at the same timing.

  Thereby, light is irradiated to the irradiation object surface with uniform or substantially uniform illuminance.

  (2) In the above-described embodiment, the acrylic resin is used as the transparent material constituting the stage 14. However, the present invention is not limited to this, and light can be transmitted. Any material that has a clear light attenuation factor value may be used.

  (3) In the above-described embodiment, only the light that travels perpendicularly to the irradiation object is considered as the light that is irradiated to the irradiation object from the upper light source and the lower light source of the light irradiation device. Of course, the present invention is not limited to this, and a light source that emits diffused light may be used.

  Note that the case of using diffused light is disclosed in, for example, a method for obtaining an illuminance value in a texel when creating an illuminance map in a computer graphic disclosed in Japanese Patent No. 411577, or disclosed in Japanese Patent Application Laid-Open No. 2011-84401. The ray-tracing method, which is a calculation method that virtually simulates physical phenomena in the real world by tracing the propagation path of the light rays traveling through the three-dimensional space. Illuminance can be obtained based on a method for obtaining an illuminance distribution given to an object from each light source disclosed in 2012-79537.

  (4) In the above-described embodiment, the LED array is used as the light source of the light irradiation device. However, the present invention is not limited to this, and a UV projector or LEDs arranged in a matrix are used. Also good.

  As shown to Fig.8 (a), when irradiating light with a UV projector, you may make it irradiate the light according to the shape of the irradiation target object.

  In addition, as shown in FIG. 8B, when using LEDs arranged in a matrix, the light intensity of light emitted from each LED is controlled by pulse width modulation in accordance with the shape of the irradiation target. It is desirable to use light sources that can be individually controlled.

  (5) In the above-described embodiment, the light source of the light irradiation device is arranged at two places on the upper side and the lower side of the irradiation object, but it is of course not limited to this, In addition to the upper side and the lower side, a light source may be arranged on each side of the housing to irradiate light from the six sides, and a spherical body in which the light source is arranged around the irradiation object May be formed and arranged.

  (6) In the above-described embodiment, when the stage part that has been subjected to three-dimensional modeling is placed on the table part of the light irradiation device, the irradiation object is aligned so that each has an uneven shape. Of course, the present invention is not limited to this. In addition to the method exemplified in the above embodiment, the irradiation object is scanned by the scanner, and the acquired scan data is used as the position of the irradiation object. You may make it use for matching.

  In addition, a mark is placed on the stage before the start of 3D modeling of the object to be irradiated, and a sensor is arranged in the light irradiation device so that the mark on the stage is detected by the sensor and 3D modeling is performed. Data alignment may be performed.

  In addition, a plane (overhead view) image of the irradiation object may be captured by an imaging camera, the position of the irradiation object may be specified from the obtained image, and the irradiation object may be aligned.

  Since such a technique is a known technique, a detailed description thereof will be omitted.

  (7) You may make it combine suitably the embodiment shown above and the modification shown in said (1) thru | or (6).

  The present invention can be used when light irradiation is performed on a three-dimensional structure such as a so-called post-cure process, which is a process performed on the three-dimensional structure.

  DESCRIPTION OF SYMBOLS 10 Light irradiation apparatus, 12 Case, 14 Stage, 14a Stage part, 14b Table part, 14aa Stage alignment convex part, 14ba Stage alignment concave part, 16 Upper light source, 18 Lower light source, 20 Scanner, 22-1, 22-2 rail, 24 microcomputer

Claims (4)

In the light irradiation device for irradiating predetermined light to the irradiation object produced by the three-dimensional modeling based on the three-dimensional modeling data representing the shape of the irradiation object,
A plate-like body made of a transparent material, and a stage used for producing an irradiation object;
Positioning means for specifying the position of the irradiation object produced on the stage;
A plurality of light sources disposed on at least an upper side and a lower side of the irradiation object and irradiating light to the irradiation object;
Reading means for reading the three-dimensional modeling data of the irradiation object into the light irradiation device;
For each light source of the plurality of light sources, obtaining means for obtaining the distance between each light source and the irradiation object from the three-dimensional modeling data read by the reading means;
The plurality of light sources according to the distances obtained by the acquisition means so that the light emitted from the light sources has uniform or substantially uniform illuminance on the surface of the irradiation object. Calculating means for calculating the luminous intensity of the light emitted by each of the light sources;
Control means for performing control so that light emitted from the light sources of the plurality of light sources to the irradiation object has a light intensity calculated by the calculation means, and is emitted at the same timing. A light irradiation apparatus comprising: In the light irradiation apparatus of Claim 1,
The alignment means is a plate-like body made of a transparent material disposed in the light irradiation device, and has a table on which the stage is placed,
The stage has stage position fixing means for fixing the position with respect to the table,
The table has an alignment reference corresponding to the stage position fixing means;
When the stage is placed on the table together with the irradiation object, the position of the irradiation object on the stage can be specified by adjusting the stage position fixing means to the alignment reference. A light irradiation device characterized. In the light irradiation apparatus of Claim 1,
The light irradiation device has a scanner that reads the entire shape of the irradiation object placed on the stage and obtains scan data of the irradiation object,
The position alignment means specifies the position of the irradiation object produced on the stage using the scan data. In a light irradiation method performed using a light irradiation device that irradiates predetermined light to an irradiation object created by three-dimensional modeling based on three-dimensional modeling data representing the shape of the irradiation object,
A plate-like body made of a transparent material, wherein a position of the irradiation object produced on the stage is specified on a stage used for producing the irradiation object, and at least above the irradiation object And a light irradiation method for irradiating light to the irradiation object from a plurality of light sources arranged on the lower side,
An alignment step for specifying the position of the irradiation object created on the stage;
A reading step of reading the three-dimensional modeling data of the irradiation object;
For each light source of the plurality of light sources, an obtaining step of obtaining the distance between each light source and the irradiation object from the three-dimensional modeling data read by the reading unit;
The plurality of light sources according to the distances obtained by the acquisition means so that the light emitted from the light sources has uniform or substantially uniform illuminance on the surface of the irradiation object. A calculation step of calculating the luminous intensity of the light emitted by each of the light sources;
A control step of performing control so that light emitted from the light sources of the plurality of light sources to the irradiation object has a light intensity calculated in the calculation step and is irradiated at the same timing. A light irradiation apparatus comprising: