CN115742304B - Opto-mechanical correction system and method for 3D printing device - Google Patents
Opto-mechanical correction system and method for 3D printing device Download PDFInfo
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- CN115742304B CN115742304B CN202310015177.8A CN202310015177A CN115742304B CN 115742304 B CN115742304 B CN 115742304B CN 202310015177 A CN202310015177 A CN 202310015177A CN 115742304 B CN115742304 B CN 115742304B
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Abstract
The invention discloses an optical machine correction system and method for 3D printing equipment, and relates to the technical field of 3D printing. The optical machine correction system comprises an adjusting device, a camera device, an image processing device, a rack, a printing platform arranged on the rack, a moving device and an optical machine; the optical machine is positioned below the printing platform, and the mobile device is positioned above the printing platform and can move up and down relative to the printing platform; the adjusting device is detachably connected with the moving device; the camera device is arranged on the adjusting device and comprises a camera with a lens facing the printing platform; the adjusting device is used for driving the camera to horizontally move or lift, and the camera is used for shooting the actual pattern projected onto the printing platform by the optical machine; the image processing device is in communication connection with the camera and is used for acquiring the number of light spots and pixel values in the photo shot by the camera. The technical scheme of the invention can solve the problems of complex operation and low measurement precision of the existing optical machine correction method.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to an optical machine correction system and method for 3D printing equipment.
Background
The existing printers using the technical principle of DLP (Digital Light Processing ) all face the problem of installation and calibration, and the DLP optical machine has an optimal design working distance, when the actual installation working distance is equal to the design working distance, the projected light spots and the light spot array size reach the design value. In a small range near the designed working distance (beyond the range, focusing can not be performed), the focusing ring on the optical machine lens can be adjusted by rotating, and the optical machine can still be projected onto the upper surface of the release film. However, when the projection working distance deviates from the design working distance, a rectangular pattern with the maximum size no longer being the design value can be projected, and the projection size of a single light spot or pixel no longer accords with the design value.
Such dimensional deviations in projection due to the installation distance may not only result from assembly, but also from the dimensions of the mechanical parts used for fixing, clearances, etc.; another reason is that the projected pattern is required to be focused on the upper surface of the release film, and light is inevitably slightly refracted after passing through the glass and the release film, and the change of the optical path length may cause a slight deviation of the working distance. The actual projected size of the pattern needs to be detected to correct the mounting position of the optical machine to be at the design working distance. However, since the projected size of each spot is small, high-precision measurement is required; and the UV light is inconvenient to directly observe and measure by naked eyes, so that the conventional optical-mechanical correction method has the problems of complex operation and low measurement accuracy when detecting the actual projection size of the pattern.
Disclosure of Invention
The invention mainly aims to provide an optical machine correction system for 3D printing equipment, which aims to solve the problems of complex operation and low measurement precision of the existing optical machine correction method.
To achieve the above object, an optical-mechanical correction system for a 3D printing device according to the present invention includes:
the device comprises a frame, a printing platform, a moving device and an optical machine, wherein the printing platform is arranged on the frame, the optical machine is arranged below the printing platform, the moving device is arranged above the printing platform, the moving device can move up and down relative to the printing platform, and the moving device can be used for installing a forming platform of the 3D printing equipment;
the adjusting device is detachably connected to the moving device;
the camera device is arranged on the adjusting device and comprises a camera, and a lens of the camera faces the printing platform; the adjusting device is used for driving the camera to horizontally move or lift, and the camera is used for shooting the actual pattern projected onto the printing platform by the optical machine;
and the image processing device is in communication connection with the camera and is used for acquiring the number of light spots and pixel values in the photo shot by the camera.
In an embodiment, the image pickup device further comprises a telecentric lens, wherein the telecentric lens is installed at the lens of the camera and extends towards the printing platform, and a UV light filter layer is arranged on one side of the telecentric lens towards the printing platform.
In an embodiment, the adjusting device comprises a first switching part, an adjusting part and a second switching part which are sequentially connected, the first switching part is used for being connected with the moving device, the second switching part is used for being connected with the camera device, the adjusting part comprises a first sliding table and a second sliding table which are arranged in a stacked mode, the first sliding table is used for driving the camera device to move vertically or move horizontally, and the second sliding table is used for driving the camera device to move vertically.
In an embodiment, the first sliding table includes first slide, second slide and the third slide of range upon range of setting, and connects the horizontal adjust knob of first slide and second slide, connect the vertical adjust knob of second slide and third slide, first slide is connected first switching portion, horizontal adjust knob is used for driving the second slide carries out lateral shifting relative to first slide, vertical adjust knob is used for driving the vertical shift of third slide relative to second slide.
The invention also provides an optical machine correction method based on the optical machine correction system for the 3D printing equipment, which comprises the following steps of:
step one: acquiring an actual physical size A corresponding to a unit pixel in a photo focused by the camera;
step two: adjusting the mobile device so that the camera device focuses on the printing platform;
step three: adjusting the optical machine to enable the pattern projected by the optical machine to be focused on the printing platform;
step four: the adjusting device is adjusted, so that the image pickup device focuses on the actual pattern projected onto the printing platform and shoots;
step five: acquiring a pixel value corresponding to a unit light spot in the photographed actual pattern photo by the image processing device, and combining the actual physical size A corresponding to the unit pixel in the first step to obtain an actual physical size B corresponding to the unit light spot in the photographed actual pattern photo; if the actual physical size B corresponding to the unit light spot is smaller than the set physical size C corresponding to the unit light spot, the distance between the optical machine and the printing platform is adjusted; if the actual physical size B corresponding to the unit light spot is larger than the set physical size C corresponding to the unit light spot, the distance between the optical machine and the printing platform is adjusted;
step six: repeating the third step to the fifth step until the actual physical size B corresponding to the unit light spot is consistent with the set physical size C corresponding to the unit light spot.
In an embodiment, the step of obtaining the actual physical size a corresponding to the unit pixel in the photograph focused by the image capturing device specifically includes:
focusing a standard sample with the shooting length of D by using the shooting device;
acquiring a pixel value E corresponding to the length of a standard sample in a shot photo of the standard sample by the image processing device;
the actual physical size a=d/E for the unit pixel is calculated.
In an embodiment, the resolution of the optical engine is F, the actual pattern size projected to the printing platform by the optical engine at the set distance is H, and the set physical size c=h/F corresponding to the unit light spot.
In an embodiment, in the fifth step, the process of obtaining the actual physical dimension B corresponding to the unit light spot in the photographed actual pattern photo specifically includes:
acquiring the number X of light spots on any straight line and the pixel value Y corresponding to the straight line in an actual pattern photo through the image processing device;
the actual physical size b= (y×a/X) of the unit spot is calculated.
In an embodiment, in the step of obtaining the pixel value Y corresponding to the straight line, the start point and the end point of the straight line are regarded as a complete unit pixel.
In an embodiment, in the sixth step, when the difference between the actual physical size B corresponding to the unit light spot and the set physical size C corresponding to the unit light spot is not greater than 1% of the set physical size C corresponding to the unit light spot, the actual physical size B corresponding to the unit light spot is considered to be consistent with the set physical size C corresponding to the unit light spot.
According to the technical scheme, the camera shooting device is adjusted to focus on the printing platform, the optical machine is focused on the printing platform, and after an actual pattern projected onto the printing platform by the optical machine falls into the visual field range of the camera, the camera shoots a photo containing part or all of the actual pattern; after the number of the light spots and the pixel values in the photo are measured by the image processing device, the pixel value corresponding to the unit light spot can be calculated, and then the actual physical size corresponding to the unit light spot in the photographed actual pattern photo can be obtained by combining the actual physical size corresponding to the unit pixel in the photo photographed by the known camera. Comparing the two dimensions to measure the deviation between the actual working distance and the designed working distance of the optical machine; after comparing the two dimensions and adjusting the working distance of the optical machine, the optical machine can be enabled to be closer to the set working distance, and correction of the installation position of the optical machine is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of an optical-mechanical calibration system for a 3D printing device;
FIG. 2 is a schematic diagram illustrating an embodiment of an optical-mechanical correction system for a 3D printing apparatus according to the present invention in which an adjusting device is mounted on a rack;
FIG. 3 is an exploded view of an adjustment device in an embodiment of an opto-mechanical correction system for a 3D printing apparatus according to the present invention;
fig. 4 is a schematic structural view of the first sliding table in fig. 3;
FIG. 5 is a cross-sectional view of the second slide table of FIG. 3;
fig. 6 is a flowchart of an optical-mechanical correction method of an optical-mechanical correction system for a 3D printing device according to an embodiment of the invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the |
| 10 | Optical |
100 | |
| 110 | |
111 | |
| 112 | |
200 | |
| 300 | |
400 | Adjusting |
| 410 | |
420 | Adjusting |
| 421 | |
4211 | |
| 4212 | |
4213 | |
| 4214 | |
4215 | |
| 422 | Second sliding table | 4221 | |
| 4222 | |
4223 | Longitudinal adjusting |
| 4224 | |
430 | |
| 500 | |
510 | |
| 520 | Telecentric lens |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides an optical machine correction system for 3D printing equipment, which can conveniently realize accurate correction of the installation position of an optical machine in the 3D printing equipment.
Referring to fig. 1 and 2, in the present embodiment, the optical-mechanical correction system 10 includes an adjusting device 400, an image capturing device 500, an image processing device (not shown), a frame 100, and a printing platform 200, a moving device 110 and an optical-mechanical device 300 disposed on the frame 100. The optical machine 300 is located below the printing platform 200, the mobile device 110 is located above the printing platform 200, the mobile device 110 can move up and down relative to the printing platform 200, and the mobile device 110 can be used for installing a forming platform of the 3D printing device; the adjusting device 400 is detachably connected to the mobile device 110; the image capturing device 500 is mounted on the adjusting device 400, the image capturing device 500 includes a camera 510, and a lens of the camera 510 faces the printing platform 200; the adjusting device 400 is configured to drive the camera 510 to perform horizontal movement or lifting movement, and the camera 510 is configured to capture an actual pattern projected onto the printing platform 200 by the optical machine 300; the image processing device is communicatively connected to the camera 510, and is configured to obtain the number of light spots and the pixel value in the photograph taken by the camera 510.
The optical engine 300 has an optimal design working distance, and when the working distance actually installed is equal to the design working distance, the projected light spot and the light spot array size reach the design values. That is, it is known that the optical bench 300 projects a set physical size corresponding to a unit spot in an actual pattern of the print platform 200 at a set distance. The image capturing device 500 may obtain the actual physical size corresponding to the unit pixel in the photo taken by focusing the image, no matter the image capturing device includes the telecentric lens 520 or only the camera 510. Adjusting to make the image capturing device 500 focus on the printing platform 200, and make the optical machine 300 focus on the printing platform 200, and after the actual pattern projected onto the printing platform 200 by the optical machine 300 falls within the field of view of the camera 510, the camera 510 captures a photo containing part or all of the actual pattern. After the number of the light spots and the pixel values in the photo are measured by the image processing device, the pixel value corresponding to the unit light spot can be calculated, and then the actual physical size corresponding to the unit light spot in the photographed actual pattern photo can be obtained by combining the known actual physical size corresponding to the unit pixel. Comparing the two dimensions, the deviation between the actual working distance and the designed working distance of the optical machine 300 can be measured. Specifically, if the actual physical size corresponding to the unit light spot is smaller than the set physical size corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted; if the actual physical size corresponding to the unit light spot is greater than the set physical size corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted. After comparing the two dimensions and adjusting the working distance of the optical bench 300, the optical bench 300 can be made to be closer to the set working distance, so as to realize the correction of the installation position of the optical bench 300.
The 3D printing apparatus generally includes a molding platform mounted on the mobile device 110, and before the 3D printing apparatus runs a printing job, the optical machine correction system 10 corrects the mounting position of the optical machine 300; after the correction is completed, the adjusting device 400 is detached, and the forming platform is mounted on the moving device 110, so that the 3D printing apparatus can sequentially perform printing work. And because adjusting device 400 and camera device 500 are located the mounted position of shaping platform, camera device 500 when shooing the projection pattern on the print platform 200, do not receive the jam of shaping platform for shooting process is more convenient.
Further, in an embodiment, the image capturing apparatus 500 further includes a telecentric lens 520, where the telecentric lens 520 is mounted at the lens of the camera 510 and extends toward the printing platform 200, and a UV light filtering layer is disposed on a side of the telecentric lens 520 toward the printing platform 200.
The telecentric lens 520 has a depth of field function, and can allow a certain range of deviation based on the focusing of the camera 510, ensure that the patterns in the photographed photo are not distorted, and compensate the situation that the camera 510 is not installed in place to a certain extent. On the other hand, the telecentric lens 520 may improve the accuracy of photographing the photo by the camera 510, for example, when the magnification of the telecentric lens 520 is 2 times, the actual physical size corresponding to the unit pixel is half of the original sensor of the camera 510 when the pixel value of the photo photographed by the camera 510 is unchanged, thereby improving the quality of photographing, and also improving the accuracy of measuring the actual size of the projection pattern of the optical machine 300, and finally enabling the adjustment of the installation position of the optical machine 300 to be more accurate. Correspondingly, the field of view of the camera 510 is reduced by half, and when the camera 510 is used to capture the actual pattern projected onto the printing platform 200 by the optical machine 300, the position of the camera 510 needs to be adjusted by the adjusting device 400, so that the actual pattern is located within the field of view of the camera 510.
The DLP digital light processing technology is one working principle of a 3D printing device, and the light engine 300 located below the printing platform 200 emits UV light and projects the UV light on the printing platform 200 to form a set pattern. The sensor of the camera 510 may be a CCD sensor or a COMS sensor, and whether the sensor is a CCD sensor or a COMS sensor, some UV light bands may interfere with the optical signal formed by the sensor, so that when the camera 510 captures an actual pattern projected by the optical machine 300, irregular shadow spots appear around a bright spot forming the actual pattern, and the state of the shadow spots is unstable, and irregular flicker may appear, which affects the observation of the bright spot forming the actual pattern. By providing the UV filter layer on the side of the telecentric lens 520 facing the printing platform 200, the UV light band that generates interference can be filtered, and the error of observing the actual pattern can be reduced. Specifically, the UV light filtering layer may be uniformly coated with an anti-UV coating on the outer side of the telecentric lens 520, or may be added with a UV light filter, such as a UV light filter sheet, on the outer side of the telecentric lens 520. It is to be understood that, when the image capturing apparatus 500 does not include the telecentric lens 520, the UV light filtering layer disposed outside the lens of the camera 510 may have the same effect, which is not described in detail herein.
Referring to fig. 2 to 5, in an embodiment, the adjusting device 400 includes a first switching portion 410, an adjusting portion 420, and a second switching portion 430 sequentially connected, the first switching portion 410 is used for connecting the moving device 110, the second switching portion 430 is used for connecting the image capturing device 500, the adjusting portion 420 includes a first sliding table 421 and a second sliding table 422 that are stacked, the first sliding table 421 is used for driving the image capturing device 500 to move vertically or laterally, and the second sliding table 422 is used for driving the image capturing device 500 to move longitudinally.
Specifically, the first sliding table 421 includes a first sliding plate 4211, a second sliding plate 4212, and a third sliding plate 4213 that are stacked, a lateral adjustment knob 4214 that connects the first sliding plate 4211 and the second sliding plate 4212, and a vertical adjustment knob 4215 that connects the second sliding plate 4212 and the third sliding plate 4213, where the first sliding plate 4211 is connected to the first adapting portion 410, the lateral adjustment knob 4214 is used to drive the second sliding plate 4212 to move laterally relative to the first sliding plate 4211, and the vertical adjustment knob 4215 is used to drive the third sliding plate 4213 to move vertically relative to the second sliding plate 4212.
The second sliding table 422 includes a fourth sliding plate 4221, a fifth sliding plate 4222, a longitudinal adjustment knob 4223, and a transmission member 4224, where the fourth sliding plate 4221 and the fifth sliding plate 4222 are stacked, the fourth sliding plate 4221 is connected to the third sliding plate 4213, the fifth sliding plate 4222 is connected to the second adapting portion 430, the longitudinal adjustment knob 4223 is connected to the fourth sliding plate 4221, the transmission member 4224 is rotatably connected to the fourth sliding plate 4221 and is located between the fourth sliding plate 4221 and the fifth sliding plate 4222, the transmission member 4224 includes a first transmission portion and a second transmission portion that are connected at an angle, the first transmission portion abuts against the longitudinal adjustment knob 4223, the second transmission portion abuts against the fifth sliding plate 4222, and when the longitudinal adjustment knob 4223 abuts against the first transmission portion, the transmission member 4224 rotates and the second transmission portion abuts against the fifth sliding plate 4222, so that the fifth sliding plate 4222 moves away from the fourth sliding plate 21 in a longitudinal direction. When the longitudinal adjustment knob 4223 is adjusted in a direction away from the transmission member 4224, the transmission member 4224 rotates the second transmission portion in a direction away from the fifth sliding plate 4222 by using its own torque, the second transmission portion releases the blocking of the fifth sliding plate 4222, and the fifth sliding plate 4222 moves toward the fourth sliding plate 4221.
The moving device 110 includes a sliding rail 111 disposed in a vertical extending manner, and a sliding block 112 slidably connected to the sliding rail 111, where the sliding block 112 can move up and down along the sliding rail 111. Corresponding screw holes are formed in the first adapting portion 410 and the slider 112, and the first adapting portion 410 is matched with the screw holes through bolts or screws to achieve detachable connection with the slider 112. The adjusting device 400 realizes the lifting movement relative to the printing platform 200 through the sliding block 112, and the image pickup device 500 is mounted on the adjusting device 400, so as to finally realize the lifting movement of the image pickup device 500 relative to the printing platform 200.
Similarly, corresponding screw holes can be formed in the third sliding plate 4213 and the fourth sliding plate 4221, and the third sliding plate 4213 and the fourth sliding plate 4221 are connected through matching of bolts or screws with the screw holes; corresponding screw holes may be formed in the fifth sliding plate 4222 and the second adapting portion 430, and the fifth sliding plate 4222 and the second adapting portion 430 are connected by matching bolts or screws with the screw holes.
It can be appreciated that the first, second, third, fourth and fifth sliding plates 4211, 4212, 4213, 4221, 4222 are stacked, the second switching portion 430 is connected to the fifth sliding plate 4222, the image capturing device 500 is connected to the fifth sliding plate 4222 through the second switching portion 430, and when the second sliding plate 4212 moves relative to the first sliding plate 4211 and the third sliding plate 4213 moves relative to the second sliding plate or the fifth sliding plate 4222 moves relative to the fourth sliding plate 4221, the image capturing device 500 is driven to move correspondingly, so as to implement horizontal movement or lifting movement of the image capturing device 500.
The invention also proposes an opto-mechanical correction method based on the opto-mechanical correction system 10 for a 3D printing device as described above.
Referring to fig. 6, in the present embodiment, the optical-mechanical correction method for a 3D printing apparatus includes the following steps:
step one S100: acquiring an actual physical size A corresponding to a unit pixel in a photo focused by the camera 500;
step two S200: adjusting the mobile device 110 such that the camera device 500 is focused on the printing platform 200;
step three S300: adjusting the optical bench 300 so that the pattern projected by the optical bench 300 is focused on the printing platform 200;
step four, S400: adjusting the adjusting device 400 so that the image capturing device 500 focuses on the actual pattern projected onto the printing platform 200 and captures the image;
step five S500: acquiring a pixel value corresponding to a unit light spot in the photographed actual pattern photo by the image processing device, and combining the actual physical size A corresponding to the unit pixel in the first step to obtain an actual physical size B corresponding to the unit light spot in the photographed actual pattern photo; if the actual physical size B corresponding to the unit light spot is smaller than the set physical size C corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted; if the actual physical size B corresponding to the unit light spot is greater than the set physical size C corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted;
step six S600: and repeating the steps from the third step S300 to the fifth step S500 until the actual physical size B corresponding to the unit light spot is consistent with the set physical size C corresponding to the unit light spot.
The principle of the optical machine calibration method is as follows: the optical engine 300 has an optimal design working distance, and when the working distance actually installed is equal to the design working distance, the projected light spot and the light spot array size reach the design values. That is, it is known that the optical bench 300 projects a set physical size C corresponding to a unit spot in an actual pattern of the print platform 200 at a set distance. However, the image capturing apparatus 500 may include the telecentric lens 520 or only the camera 510, so as to obtain the actual physical size a corresponding to the unit pixel in the photo focused by the camera. Adjusting to make the image capturing device 500 focus on the printing platform 200, and make the optical machine 300 focus on the printing platform 200, and after the actual pattern projected onto the printing platform 200 by the optical machine 300 falls within the field of view of the camera 510, the camera 510 captures a photo containing part or all of the actual pattern. And measuring a pixel value corresponding to the unit light spot in the photo by the image processing device, and combining the known actual physical size A corresponding to the unit pixel to obtain the actual physical size B corresponding to the unit light spot in the photographed actual pattern photo. Comparing the B value with the C value, the deviation between the actual working distance and the designed working distance of the optical machine 300 can be measured. Specifically, if the actual physical size B corresponding to the unit light spot is smaller than the set physical size C corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted; if the actual physical size B corresponding to the unit light spot is greater than the set physical size C corresponding to the unit light spot, the distance between the optical machine 300 and the printing platform 200 is adjusted. After comparing the B value and the C value and adjusting the working distance of the optical bench 300, the optical bench 300 can be made to be closer to the set working distance, so as to realize the correction of the installation position of the optical bench 300.
Specifically, the resolution of the optical engine 300 is F, the actual pattern size projected onto the printing platform 200 by the optical engine 300 at the set working distance is H, and the set physical size c=h/F corresponding to the unit light spot. For example, the resolution of the optical engine 300 is 1920×1080, and the actual pattern size projected onto the printing platform 200 at the set working distance is 96×54mm, and the set physical size corresponding to the unit light spot is 50×50 μm.
It will be appreciated that the actual pattern projected by the optical engine 300 is actually located on the release film of the printing platform 200, and the release film is generally provided with unavoidable lines such as scratches, and in the step of adjusting the moving device 110 so that the image capturing device 500 focuses on the printing platform 200, when the camera 510 can observe the scratches until the scratches are clear in the field of view, we consider that the camera 510 focuses on the surface of the release film.
The step of adjusting the optical bench 300 to focus the pattern projected by the optical bench 300 on the printing platform 200 specifically includes: the optical engine 300 projects any pattern above the release film, and adjusts the focusing ring of the lens of the optical engine 300 so that the projected pattern reaches the clearest or maximum contrast on the release film, and at this time, the pattern projected by the optical engine 300 is considered to be projected on the upper surface of the release film and focused.
Specifically, in an embodiment, the step S100 of obtaining the actual physical size a corresponding to the unit pixel in the photo focused by the image capturing device 500 includes:
focusing a standard sample with a shooting length D by using the camera 500;
acquiring a pixel value E corresponding to the length of a standard sample in a shot photo of the standard sample by the image processing device;
the actual physical size a=d/E for the unit pixel is calculated.
Further, in the fifth step S500, the process of obtaining the actual physical size B corresponding to the unit light spot in the photographed actual pattern photo specifically includes:
acquiring the number X of light spots on any straight line and the pixel value Y corresponding to the straight line in an actual pattern photo through the image processing device;
the actual physical size b= (y×a/X) of the unit spot is calculated.
Specifically, in the step of obtaining the pixel value Y corresponding to the straight line, the start point and the end point of the straight line are regarded as a complete unit pixel. Considering that when the pixel value corresponding to the straight line is measured, the starting point and the end point of the straight line of the light spot are not necessarily a complete unit pixel, but the integral multiple of the unit pixel of the measured value of the pixel value is required to be estimated and read at the starting point and the end point of the straight line of the light spot, and the starting point and the end point of the straight line of the light spot are regarded as a complete unit pixel. At this time, there is a theoretical error of at most two unit pixels, and the smaller the actual physical size a corresponding to the unit pixels is, the smaller the theoretical error caused by the two unit pixels is.
In an embodiment, in the step S600, when the difference between the actual physical size B corresponding to the unit light spot and the set physical size C corresponding to the unit light spot is not greater than 1% of the set physical size C corresponding to the unit light spot, the actual physical size B corresponding to the unit light spot is considered to be consistent with the set physical size C corresponding to the unit light spot.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (9)
1. An optomechanical correction method for an optomechanical correction system of a 3D printing device, the optomechanical correction system comprising:
the device comprises a frame, a printing platform, a moving device and an optical machine, wherein the printing platform is arranged on the frame, the optical machine is arranged below the printing platform, the moving device is arranged above the printing platform, the moving device can move up and down relative to the printing platform, and the moving device can be used for installing a forming platform of the 3D printing equipment;
the adjusting device is detachably connected to the moving device;
the camera device is arranged on the adjusting device and comprises a camera, and a lens of the camera faces the printing platform; the adjusting device is used for driving the camera to horizontally move or lift, and the camera is used for shooting the actual pattern projected onto the printing platform by the optical machine;
the image processing device is in communication connection with the camera and is used for acquiring the number of light spots and pixel values in the photo shot by the camera;
the optical machine correction method comprises the following steps:
step one: acquiring an actual physical size A corresponding to a unit pixel in a photo focused by the camera;
step two: adjusting the mobile device so that the camera device focuses on the printing platform;
step three: adjusting the optical machine to enable the pattern projected by the optical machine to be focused on the printing platform;
step four: the adjusting device is adjusted, so that the image pickup device focuses on the actual pattern projected onto the printing platform and shoots;
step five: acquiring a pixel value corresponding to a unit light spot in the photographed actual pattern photo by the image processing device, and combining the actual physical size A corresponding to the unit pixel in the first step to obtain an actual physical size B corresponding to the unit light spot in the photographed actual pattern photo; if the actual physical size B corresponding to the unit light spot is smaller than the set physical size C corresponding to the unit light spot, the distance between the optical machine and the printing platform is adjusted; if the actual physical size B corresponding to the unit light spot is larger than the set physical size C corresponding to the unit light spot, the distance between the optical machine and the printing platform is adjusted;
step six: repeating the third step to the fifth step until the actual physical size B corresponding to the unit light spot is consistent with the set physical size C corresponding to the unit light spot.
2. The optomechanical correction method of claim 1, wherein the image pickup device further comprises a telecentric lens mounted at a lens of the camera and extending toward the printing platform, and a UV light filter layer is disposed on a side of the telecentric lens toward the printing platform.
3. The optomechanical correction method of claim 1, wherein the adjusting device comprises a first switching part, an adjusting part and a second switching part which are sequentially connected, the first switching part is used for connecting the moving device, the second switching part is used for connecting the image pickup device, the adjusting part comprises a first sliding table and a second sliding table which are arranged in a stacked mode, the first sliding table is used for driving the image pickup device to vertically move or transversely move, and the second sliding table is used for driving the image pickup device to longitudinally move.
4. The optomechanical correction method of claim 3, wherein the first sliding table includes a first sliding plate, a second sliding plate, and a third sliding plate that are stacked, and a lateral adjustment knob that connects the first sliding plate and the second sliding plate, and a vertical adjustment knob that connects the second sliding plate and the third sliding plate, the first sliding plate is connected to the first adapter, the lateral adjustment knob is used for driving the second sliding plate to move laterally with respect to the first sliding plate, and the vertical adjustment knob is used for driving the third sliding plate to move vertically with respect to the second sliding plate.
5. The method for optical-mechanical correction of optical-mechanical correction system of 3D printing apparatus according to claim 1, wherein the step of obtaining the actual physical size a corresponding to the unit pixel in the photograph focused by the image capturing device specifically comprises:
focusing a standard sample with the shooting length of D by using the shooting device;
acquiring a pixel value E corresponding to the length of a standard sample in a shot photo of the standard sample by the image processing device;
the actual physical size a=d/E for the unit pixel is calculated.
6. The method according to claim 1, wherein the resolution of the optical engine is F, the actual pattern size projected onto the printing platform by the optical engine at the set distance is H, and the set physical size c=h/F corresponding to the unit light spot.
7. The optomechanical correction method of claim 1, wherein in the fifth step, the process of obtaining the actual physical size B corresponding to the unit light spot in the photographed actual pattern photo specifically includes:
acquiring the number X of light spots on any straight line and the pixel value Y corresponding to the straight line in an actual pattern photo through the image processing device;
the actual physical size b= (y×a/X) of the unit spot is calculated.
8. The method according to claim 7, wherein in the step of obtaining the pixel value Y corresponding to the straight line, the start point and the end point of the straight line are regarded as a complete unit pixel.
9. The optomechanical correction method of claim 1, wherein in the sixth step, when the difference between the actual physical size B corresponding to the unit light spot and the set physical size C corresponding to the unit light spot is not greater than 1% of the set physical size C corresponding to the unit light spot, the actual physical size B corresponding to the unit light spot is considered to coincide with the set physical size C corresponding to the unit light spot.
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| US20180029309A1 (en) * | 2016-07-29 | 2018-02-01 | Young Optics Inc. | Method for a 3-d projection printing system and system thereof |
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| CN106827515B (en) * | 2017-02-20 | 2018-12-28 | 大族激光科技产业集团股份有限公司 | Calibration method and system is imaged in 3D printing |
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