KR20170118398A - Auto correction method of the size and arrangement of image projected through a DLP 3D Printer - Google Patents

Auto correction method of the size and arrangement of image projected through a DLP 3D Printer Download PDF

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Publication number
KR20170118398A
KR20170118398A KR1020160046117A KR20160046117A KR20170118398A KR 20170118398 A KR20170118398 A KR 20170118398A KR 1020160046117 A KR1020160046117 A KR 1020160046117A KR 20160046117 A KR20160046117 A KR 20160046117A KR 20170118398 A KR20170118398 A KR 20170118398A
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South Korea
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dlp
light
size
projected
printer
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KR1020160046117A
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Korean (ko)
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조길완
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주식회사 하나올테크
조길완
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Priority to KR1020160046117A priority Critical patent/KR20170118398A/en
Publication of KR20170118398A publication Critical patent/KR20170118398A/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/0037—Production of three-dimensional images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/204—Image signal generators using stereoscopic image cameras
    • H04N13/254—Image signal generators using stereoscopic image cameras in combination with electromagnetic radiation sources for illuminating objects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3188—Scale or resolution adjustment

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)

Abstract

The present invention relates to a method and apparatus for automatically adjusting the size and position of an image screen projected from a DLP type 3D printer, and more particularly, In DLP type 3D printers where photosensors are mounted on the upper and lower corners of one corner of the photocurable resin reservoir where the light is projected, the DLP projector of the DLP type 3D printer detects the projection pattern slope correction mode ; ≪ / RTI > And performing a size correction mode of the projection pattern according to a control signal of the computer, wherein the tilt correction mode of the projection pattern includes: outputting the rightmost vertical line in the vertical direction at the end of the image output pattern; ; Moving the vertical line to the left by one pixel if light is not detected by the upper photo sensor and storing the upper position value of the vertical line in the storage space Nt when light is sensed; Moving the vertical line by one pixel to the left if light is not detected by the lower photo sensor and storing the lower position value of the vertical line in the storage space Nb if light is sensed; And determining the degree of inclination of the output screen of the DLP projector by the number of pixels (Nt-Nb) and correcting the tilted projection pattern to coincide with the position of the normally output screen.

Description

[0001] The present invention relates to a DLP 3D printer, and more particularly,

More particularly, the present invention relates to a method for automatically correcting a size and an arrangement of an image displayed on a DLP type 3D printer, and more particularly, The present invention relates to a method of automatically adjusting the size and layout of an image screen projected from a DLP type 3D printer capable of solving the problem of overlapped projection and inclination of an image and overlapping of projected images of two DLP projectors by using a photo sensor will be.

A typical printer is a device for printing characters or graphics on a paper to be printed, which is a type of two-dimensional printing in which a fine ink is sprinkled while moving in a predetermined direction. However, recently, a three- Printers have been developed and released.

In such a 3D printer, a SLA system (Stereo Lithography Apparatus) which uses a principle in which a scanned portion is cured by scanning laser light with a photocurable resin, and a functional polymer or metal powder in place of a photocurable resin in an SLA system, (SLS) method, FDM (Fused Deposition Modeling) method using the principle of forming by curing by scanning a light beam, and a method of irradiating light to the lower part of the storage tank in which the photo- There is DLP method (Digital Light Processing) using principle.

DLP type 3D printers have been disclosed in U.S. Patent No. US8110135 "PROCESS AND FREEFORM FABRICATION SYSTEM FOR PRODUCING A THREE-DIMENSIONAL OBJECT".

1 is a schematic view schematically showing a configuration of a conventional DLP 3D printer 10.

As shown in the drawing, the conventional 3D printer 10 irradiates the DLP projector 11 to the lower part of the storage tank 13 in which the photocurable resin A is stored.

A region where the molding stage 12 is inserted into the reservoir 13 of the transparent material and the region irradiated with light is cured and a cured layer corresponding to the sectional shape of the molded article is formed on the stage 12.

The molding stage 12 gradually rises and the cured layers are laminated in multiple layers to form a three-dimensional molded product.

On the other hand, in the case of a DLP type 3D printer, the size of the output result must exactly match the design size on the drawing.

However, if correction is not performed due to an assembly error or an error of an optical system generated during the process of assembling a DLP type 3D printer, the output result may be formed to be larger or smaller than the design size, and the output result may be distorted .

In order to improve the output size of the DLP optical module, the arrangement of the optical modules is very important when the two are arranged in parallel. At this time, the two screens must not overlap each other, and the distance between the two screens must not be reduced. Due to the error of the optical system, a difference in magnification occurs, and the size of the output unit should not be changed for each optical module for the same design size. That is, there is a problem that when the output result is exceeded due to the error of the optical system and does not match the actual size, and when the output result is inclined, the output result may not be vertical and horizontal.

Korean Registered Patent No. 10-1533374 (registered on June 26, 2015)

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a photosensor in the upper and lower portions of one corner of a lower projection surface of a photocurable resin reservoir on which light irradiated from a DLP projector is projected, And an object of the present invention is to provide a method of automatically correcting the size and layout of an image screen projected from a DLP type 3D printer capable of overcoming projection and tilting and overlapping of projected images of two DLP projectors.

In order to accomplish the object of the present invention, there is provided a method of automatically adjusting the size and arrangement of an image screen projected in a DLP type 3D printer, A DLP type 3D printer in which photosensors are installed on upper and lower portions of one corner of a lower projection surface of a light curing resin reservoir to which light irradiated from a DLP projector is projected, a DLP projector of a DLP type 3D printer, Performing a tilt correction mode of; And performing a size correction mode of the projection pattern according to a control signal of the computer.

The tilt correction mode of the projection pattern of the present invention includes the steps of outputting the rightmost vertical line in the vertical direction at the end of the image output pattern; Moving the vertical line to the left by one pixel if light is not detected by the upper photo sensor and storing the upper position value of the vertical line in the storage space Nt when light is sensed; Moving the vertical line by one pixel to the left if light is not detected by the lower photo sensor and storing the lower position value of the vertical line in the storage space Nb if light is sensed; And determining the degree of inclination of the output screen of the DLP projector by the number of pixels (Nt-Nb) and correcting the tilted projection pattern to coincide with the position of the normally output screen.

The size correction mode of the projection pattern of the present invention may include: projecting one line horizontally at an upper end of an output screen projected on a lower projection surface of a storage tank; Vertically moving the horizontal line downward until it is photo sensed by the upper photo sensor; And a step of calculating the number of pixels exceeding the actual projection amount by an amount corresponding to the number of vertically shifted pixels when the light is sensed by the upper photo sensor, .

The size correction mode of the projection pattern of the present invention may include: projecting one line horizontally at a lower end of an output screen projected on a lower projection surface of a storage tank; Vertically moving the horizontal line upwards until the lower photo sensor detects light; And when the light is sensed by the lower photo sensor, it is determined that the actual projection is projected in the downward direction by the number of vertically moved pixels, and the number of pixels exceeded is calculated and reduced to fit the normal projection area. And further comprising:

The photo sensor of the present invention is arranged in the direction toward the DLP projector and is arranged inwardly and horizontally at 5% in the maximum screen size of the output screen of the DLP project.

As described above, in order to solve the technical problem pursued by the present invention, the present invention provides a photosensor installed at the upper and lower portions of one corner of the lower projection surface of the photocurable resin reservoir on which the light irradiated from the DLP projector is projected, There is an advantage that over projection and tilting and overlapping of the projected images of the two DLP projectors can be solved.

1 is a schematic view schematically showing a configuration of a conventional DLP 3D printer.
FIG. 2 is a view schematically showing the construction of a DLP type 3D printer according to the present invention.
3 is a flowchart illustrating a tilt correction mode of a projection screen in a DLP type 3D printer according to the present invention.
FIG. 4 is a diagram illustrating a screen in which a tilt correction mode of a projection screen is executed in a DLP-based 3D printer according to the present invention.
FIG. 5 is a flowchart illustrating a size correction mode of a projection screen in a DLP type 3D printer according to the present invention.
FIGS. 6 to 8 are diagrams illustrating screens in which the size correction mode of the projection screen is executed in the DLP-based 3D printer according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding the reference numerals to the constituent elements of the drawings, it is to be noted that the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Further, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be practiced by those skilled in the art.

FIG. 2 is a view schematically showing the construction of a DLP type 3D printer according to the present invention.

2, the DLP type 3D printer 10 for implementing the method of the present invention includes a DLP projector 11 which irradiates light to a lower portion of a storage tank 13 in which a photocurable resin A is stored, A photosensor 15 is provided on the upper and lower portions of one corner of the lower projection surface 13a of the photocurable resin (A) storage tank 13 from which the light irradiated from the DLP projector 11 is projected.

The photosensors 15 are arranged in the direction toward the DLP projector 11 and the positions are arranged vertically and horizontally within 5% in the maximum screen size of the output screen 14 of the DLP project 11, respectively. For example, if the projection screen is 200mm * 100mm, the sensor is placed 190mm horizontal, 95mm vertical, 10mm horizontal, 5mm vertical.

The DLP 3D printer 10 according to the present invention forms a desired molded article B in the form of a stereoscopic image. To this end, design drawing data corresponding to the three-dimensional shape of the molded product B is stored in a computer (not shown), and when a computer (not shown) applies an output signal to the DLP projector 11, And the output screen 14 is projected onto the lower projection surface 13a of the storage tank 13 in which the photopolymerizable resin A is stored.

Due to the error of the optical system in the output process and the distance error between the output of the DLP projector 11 and the output of the DLP projector 11, the actual output is in conformity with the drawing, unless the size of the design drawing data is 200 mm * It may not be output to the actual size. At this time, the DLP projector 11 detects the size of the actual projected area in accordance with the drawing, and thereafter scales down the image in accordance with the actual size in an image processing circuit (not shown) of the electronic circuit, Up (scale up) to automatically output the same output as the actual size.

FIG. 3 is a flowchart for explaining a tilt correction mode of a projection screen in a DLP type 3D printer according to the present invention. FIG. 4 is a diagram illustrating a screen in which a tilt correction mode of a projection screen is executed in a DLP- .

3 and 4, when DLP 3D printer 10 for implementing the tilt correction method of the present invention receives design drawing data corresponding to a three-dimensional shape stored in a computer (not shown) The optical output of the DLP projector 11 is controlled to project the output screen 14 onto the lower projection surface 13a of the storage tank 13 in which the photopolymerizable resin A is stored. Here, the dotted line and the solid line outside the output screen 14 indicate the outline of the screen which is out of the size of the normal output screen.

The DLP projector 11 of the DLP type 3D printer 10 performs the tilt correction mode of the projection pattern according to the control signal of the computer and transmits the image data through the image processing circuit (not shown) (S11). When the photosensor 15 is installed on the upper corner of one corner of the lower projection surface 13a of the storage tank 13, When light is detected in the storage unit 15, the upper position value is stored in the storage space Nt (S12).

Then, if light is not detected in the photosensor 15 installed at the lower portion, the vertical line is moved to the left by one pixel, If light is detected in the photosensor 15 installed at the lower position after the re-execution of the step S13, the lower position value is stored in the storage space Nb (S15).

If no light is detected in the upper photosensor 15 in step S11, whether or not light is detected in the photosensor 15 installed in the lower part is checked in step S16, If the vertical line is not detected, the vertical line is shifted to the left by one pixel to re-execute the step S11 (S17).

If light is detected in the photosensor 15 installed in the lower part in the step S16, the lower position value is stored in the storage space Nb not shown (S18). If light is detected in the photosensor 15 installed in the upper part (S19). If no light is detected in the upper photosensor 15, the vertical line is moved to the left by one pixel (S20). After the step S19 is executed again, When light is detected in the photosensor 15, the upper position value is stored in the storage space Nt (not shown) (S21).

If light is detected in the upper photosensor 15 in step S11, the upper position value is stored in the storage space Nt (S14), and the light is detected by the photosensor 15 installed on the upper side (S15). When no light is detected in the photosensor 15 installed on the upper side, the vertical line is shifted to the left by one pixel and the step S15 is performed again. 15), the upper position value is stored in the storage space Nt (not shown) (S17).

The DLP projector 11 determines the degree of tilt by the number of moving pixels (Nt-Nb) (S122) and performs the tilt correction algorithm (S23). Here, the tilt correction algorithm proceeds to the tilt correction mode initially set in the DLP projector 11. [

For example, when the projector is a DLP projector of ultraviolet light source, the resolution is 1920 * 1080, the size of the pixel is 10um, and the mechanical assembly error of the 3D printer causes the projection surface to tilt in the reverse triangle direction .

1. Project a light in the form of a vertical line with a length of 1920 pixels (192mm) vertically with a thickness of 10um, which is 1 pixel wide at the right edge of the vertical direction (1920 pixel side).

2. Move the vertical line to the left by 1 pixel (10um), and check if the upper sensor 15 detects light.

3. Repeat step 2 until light is detected by the upper sensor 15.

4. Repeat step 2 n times until light is detected by the lower sensor (15). If light is detected after n pixel moves to the bottom sensor, it can be found that the projection screen is tilted by n x pixel size (10 um). That is, if moving the vertical line 10 and detecting light in the lower sensor 15, the projection screen is tilted by 10 x 10 um = 100 um.

5. In the screen processing program of the DLP projector 11, the tilt is corrected so as to be tilted backward by -100 um.

6. As a result of the above processing, a physically inclined projection screen is constituted as a projection screen which is inclined reversely in the screen processing, so that the correction is performed and the inclination is canceled, so that a non-inclined projection can be obtained.

7. If the projection screen is tilted in the opposite direction, the above procedure is the same, but the detection sequence of the sensor, upper and lower, is changed.

FIG. 5 is a flowchart for explaining a size correction mode of a projection screen in a DLP type 3D printer according to the present invention. FIGS. 6 to 8 are views illustrating a DLP type 3D printer according to the present invention, Fig.

5 to 8, when a design drawing data corresponding to a three-dimensional shape stored in a computer (not shown) is transmitted, the DLP-type 3D printer 10 for implementing the method of the present invention transmits a DLP projector 11 so that the output screen 14 is projected onto the lower projection surface 13a of the storage tank 13 in which the photopolymerizable resin A is stored. Here, the dotted line and the solid line outside the output screen 14 indicate the outline of the screen which is out of the size of the normal output screen.

The DLP projector 11 of the DLP type 3D printer 10 performs a size correction mode of a projection pattern according to a control signal of a computer and outputs a top horizontal line of an image output pattern through an image processing circuit (not shown) (S30 , It is detected whether or not light is sensed by the photosensor 15 installed at the upper part of one corner of the projection surface 13a of the storage tank 13 (S31), and if light is not detected in the photosensor 15 installed at the upper part , The upper horizontal line is shifted down to one pixel (S32). If the light is detected in the photosensor 15 installed at the upper part after the step S31 is performed again, the pixel shift value is not shown In the storage space Nh (S33).

The DLP projector 11 outputs a lowermost horizontal line of the image output pattern through an image processing circuit (S34) and a photosensor (not shown) provided at a lower portion of one corner of the projection surface 13a of the storage tank 13 (S35). If no light is detected in the photosensor 15 installed in the lower portion, the lower horizontal line is moved down by one pixel (S36). In S35, When light is detected in the photosensor 15 installed at the lower part, the pixel shift value is stored in the storage space Ni (S37).

Thereafter, the DLP 3D printer 10 performs a reduction calculation process on the output screen 14 based on the upper and lower pixel shift values through the screen processing program of the DLP projector 11 (S38).

For example, assuming that the projection screen is projected larger than the normal projection screen due to a magnification error of the optical lens or a mechanical assembly error of the 3D printer, assuming that the actual projection pattern is projected larger than the normal projection area, : DLP projector of ultraviolet light source, resolution: 1920 * 1080, size of pixel: 10um.

1. Outputs one horizontal line type light having a thickness of 10um and a length of 108mm which is 1080 pixels horizontally on the upper part of the image output unit.

2. Vertically move the horizontal line downward by n times in 1 pixel unit until the upper photosensor (15) detects light. In this case, an image processing circuit (not shown) computes the number of pixels exceeding that of the actual projection by the number of shifted n pixels in the upward direction, , The pixel size (10um) = 100um is over projected at 10x Pixels, and the projected area is reduced by -100um in the image processing, so that it is corrected to the size of the ortho projected screen.

3. In the same manner as in steps 1 and 2, one horizontal line type light is projected to the lower end, and then the upper end of the lower end photo sensor 15 is vertically moved until the light is sensed, Find it and correct it in the same way.

As described above, according to the present invention, a photosensor is installed at the upper and lower portions of one corner of a lower projection surface of a photocurable resin reservoir on which light emitted from a DLP projector is projected, It is possible to automatically correct the overlapping of the projected images of the projector.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be possible. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

10: DLP-based 3D printer 11: DLP projector
12: molding stage 13: storage tank
13a: Lower projection surface
14: Output screen 15: Photo sensor

Claims (5)

In a method for automatically adjusting the size and arrangement of an image screen projected from a DLP-type 3D printer,
In a DLP type 3D printer in which a photosensor is installed on the upper and lower portions of one corner of the lower projection surface of the photocurable resin reservoir on which the light irradiated from the DLP projector is projected,
The DLP projector of the DLP type 3D printer performs the tilt correction mode of the projection pattern in accordance with the control signal of the computer;
And performing a size correction mode of the projection pattern in accordance with a control signal of the computer.
The method according to claim 1,
Wherein the tilt correction mode of the projection pattern includes:
Outputting the rightmost vertical line in the vertical direction at the end of the image output pattern,
Moving the vertical line to the left by one pixel if light is not detected by the upper photo sensor and storing the upper position value of the vertical line in the storage space Nt when light is sensed;
Moving the vertical line by one pixel to the left if light is not detected by the lower photo sensor and storing the lower position value of the vertical line in the storage space Nb if light is sensed; And
(Nt-Nb) by the number of pixels of the output image of the DLP projector and correcting the tilted projection pattern so as to coincide with the position of the normally output screen. How to calibrate screen size and placement automatically.
The method according to claim 1,
The size correction mode of the projection pattern includes:
Projecting one line horizontally at an upper end of an output screen projected on a lower projection surface of the storage tank;
Vertically moving the horizontal line downward until it is photo sensed by the upper photo sensor; And
If the upper photo sensor senses light, it is determined that the actual projection is projected in an upward direction by the number of vertically moved pixels, and the number of exceeded pixels is calculated and reduced to fit the normal projection area And automatically adjusting the size and arrangement of the image of the image projected on the DLP type 3D printer.
The method according to claim 1,
The size correction mode of the projection pattern includes:
Projecting one line horizontally at a lower end of an output screen projected onto a lower projection surface of the storage tank;
Vertically moving the horizontal line upwards until the lower photo sensor detects light; And
When the light is sensed by the lower photo sensor, it is determined that the actual projection is projected excessively downward by the number of vertically moved pixels, and the number of exceeded pixels is calculated and reduced to fit the normal projection area And automatically corrects the size and arrangement of the projected image on the DLP type 3D printer.
The method according to claim 1,
The photo-
And the DLP projector is arranged in a direction toward the DLP projector, and the DLP projector is disposed in the maximum screen size of the DLP projector in the vertical and horizontal directions by 5%, respectively. .
KR1020160046117A 2016-04-15 2016-04-15 Auto correction method of the size and arrangement of image projected through a DLP 3D Printer KR20170118398A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
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CN110884127A (en) * 2019-12-28 2020-03-17 上海唯视锐光电技术有限公司 Splicing type 3D printing device and printing method
CN113393567A (en) * 2021-05-31 2021-09-14 深圳市创想三维科技有限公司 3D printing method and device, computer equipment and storage medium
CN113977949A (en) * 2021-11-01 2022-01-28 深圳市纵维立方科技有限公司 3D printer and control method thereof
CN114559653A (en) * 2022-01-07 2022-05-31 宁波智造数字科技有限公司 Photocuring 3D printing uniformity adjusting process method utilizing cube matrix

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110884127A (en) * 2019-12-28 2020-03-17 上海唯视锐光电技术有限公司 Splicing type 3D printing device and printing method
CN110884127B (en) * 2019-12-28 2024-05-07 上海唯视锐光电技术有限公司 Spliced 3D printing device and printing method
CN113393567A (en) * 2021-05-31 2021-09-14 深圳市创想三维科技有限公司 3D printing method and device, computer equipment and storage medium
CN113393567B (en) * 2021-05-31 2024-05-17 深圳市创想三维科技有限公司 3D printing method, device, computer equipment and storage medium
CN113977949A (en) * 2021-11-01 2022-01-28 深圳市纵维立方科技有限公司 3D printer and control method thereof
CN113977949B (en) * 2021-11-01 2024-06-04 深圳市纵维立方科技有限公司 3D printer and control method thereof
CN114559653A (en) * 2022-01-07 2022-05-31 宁波智造数字科技有限公司 Photocuring 3D printing uniformity adjusting process method utilizing cube matrix
CN114559653B (en) * 2022-01-07 2024-01-19 宁波智造数字科技有限公司 Photo-curing 3D printing uniformity adjustment method using cube matrix

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