CN211105636U - Optical calibration tool and 3D printing equipment - Google Patents
Optical calibration tool and 3D printing equipment Download PDFInfo
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- CN211105636U CN211105636U CN201921543686.3U CN201921543686U CN211105636U CN 211105636 U CN211105636 U CN 211105636U CN 201921543686 U CN201921543686 U CN 201921543686U CN 211105636 U CN211105636 U CN 211105636U
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Abstract
The utility model provides a frock and 3D printing apparatus are markd to optics, wherein, the frock is markd to optics includes: an illumination section; the calibration plate comprises a calibration plate substrate and calibration points, wherein the calibration plate substrate is provided with a first surface and a second surface which are opposite to each other, the calibration points are arranged on the first surface of the calibration plate substrate, and the second surface of the calibration plate substrate faces the illumination part; and the coating covers the first surface of the calibration plate substrate, and the surface roughness of the coating is higher than that of the calibration plate substrate. Through the tectorial membrane is solved the reflection of light and the refraction problem of calibration board, through illumination portion makes the calibration point of calibration board forms images on the tectorial membrane for the image that the camera was shot is clear, and the demarcation effect that obtains is accurate, thereby improves 3D printing apparatus's printing precision.
Description
Technical Field
The utility model relates to a 3D prints technical field, especially relates to an optics is markd frock and 3D printing apparatus.
Background
3D printing is one of the rapid prototyping technologies, which is a technology for constructing an object by using bondable materials such as powdered metal, plastic, and resin, etc. in a layer-by-layer printing manner, based on a digital model file. The 3D printing apparatus manufactures a 3D object by performing such a printing technique. The 3D printing equipment has wide application in the fields of dies, customized commodities, medical jigs, prostheses and the like due to high forming precision.
In order to realize high-precision printing of the 3D printing equipment, the 3D printing equipment needs to be subjected to optical calibration, the principle of the optical calibration is to compare the difference between the mark points projected by the 3D printing equipment and the calibration points on the calibration plate, and the mark points projected by the 3D printing equipment are corrected according to the difference, so that the precision of the calibration plate directly determines the precision of the 3D printing.
At present, 3D printing equipment generally uses metal, ceramic or glass's calibration plate, but the calibration point precision of metal and ceramic calibration plate is not high, and reflection of light and refraction problem appear easily in the glass calibration plate, and when using the camera to shoot the mark point that 3D printing equipment throwed and the calibration point on the calibration plate, the condition that can't shoot or shoot the unsharpness appears easily.
Therefore, under the condition of ensuring the precision of the calibration point, the problems of light reflection, refraction and ambient light interference of the calibration plate in the 3D printing calibration process are urgently needed to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide an optics are markd frock and 3D printing apparatus, can solve 3D and print the problem of demarcation in-process calibration plate reflection of light, refraction and ambient light interference.
In order to solve the above technical problem, an embodiment of the utility model provides an optics calibration tool, include: an illumination section; the calibration plate comprises a calibration plate substrate and calibration points, wherein the calibration plate substrate is provided with a first surface and a second surface which are opposite to each other, the calibration points are arranged on the first surface of the calibration plate substrate, and the second surface of the calibration plate substrate faces the illumination part; and the coating covers the first surface of the calibration plate substrate, and the surface roughness of the coating is higher than that of the calibration plate substrate.
Optionally, the method further includes: the supporting part comprises a bottom plate and a supporting part perpendicular to the bottom plate, an accommodating space is formed by the supporting part and the bottom plate, the top of the accommodating space is in an opening shape, and the opening faces to the second surface of the calibration plate substrate.
Optionally, the supporting member includes a plurality of side plates or columns having the same height, the side plates or columns are used for supporting the calibration plate, and the calibration plate is parallel to the bottom plate of the supporting portion.
Optionally, the illumination portion is installed in the accommodating space, and an illumination range of the illumination portion at least covers the calibration point.
Optionally, the illumination portion comprises a plurality of L ED lamps.
Optionally, the illumination portion further comprises a plurality of light strips, and the L ED lights are fixed on the light strips.
Optionally, a light equalizing plate is further disposed between the illumination portion and the calibration plate, and the light equalizing plate enables light emitted by the illumination portion to be uniformly diffused onto the calibration plate.
Optionally, the calibration plate substrate is made of glass, resin or plastic.
Optionally, the cover film comprises a coloured plastic or paper film.
Optionally, the material of the light homogenizing plate includes polycarbonate or polymethyl methacrylate.
Optionally, the method further includes: the leveling mechanism is arranged on the supporting part and enables the calibration plate to be parallel to the horizontal plane.
Optionally, the illumination portion further has a control device for controlling a switch state of the illumination portion.
Optionally, the control device may be further configured to adjust the brightness of the illumination portion.
The embodiment of the utility model provides a still provide a 3D printing apparatus, include: the optical calibration tool is used; the objective table is used for placing the optical calibration tool; a light projector for projecting a marker point on the cover film.
Compared with the prior art, the utility model discloses technical scheme has following beneficial effect:
the method comprises the steps that a first surface of a calibration plate substrate is covered with a layer of coating, because a calibration point is arranged on the first surface, the surface covered by the coating is the surface for acquiring an image of the calibration point, and the surface roughness of the coating is higher than that of the calibration plate substrate, when a camera is used for shooting the calibration point on the calibration plate or a mark point projected by 3D printing equipment, a light source of the 3D printing equipment or other ambient light irradiates the coating to generate diffuse reflection instead of directly irradiating the calibration plate substrate to generate mirror reflection, so that the interference of reflection or refraction of the calibration plate substrate on image acquisition can be weakened, and clear images of the calibration point and the mark point can be acquired; in addition, the lighting part enables the calibration point on the calibration plate to form an image on the coating film, the definition of the calibration point cannot be influenced due to the existence of the coating film, and the image of the calibration point of the calibration plate can still be clearly shot, so that the problem that the camera cannot clearly shoot due to reflection, refraction and ambient light interference of the calibration plate in the calibration process is solved.
Drawings
Fig. 1 is an exploded view of an optical calibration tool according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a calibration plate in the optical calibration tool provided in fig. 1.
Detailed Description
As known from the background art, in order to ensure the precision of 3D printing, optical correction needs to be performed on a 3D printing device before printing, and a commonly used optical correction method at present is to photograph a mark point projected by the 3D printing device and a calibration point on a calibration plate with a camera and compare the mark point and the calibration point.
Because the calibration point precision of the glass calibration plate is higher, the cost of the glass material is lower, and the glass calibration plate is usually used for optical calibration. Generally, a glass calibration plate comprises a glass calibration plate substrate and a calibration point, wherein the glass calibration plate substrate comprises a first surface and a second surface which are opposite to each other, the calibration point is located on the first surface of the glass calibration plate substrate, and the first surface is a surface for acquiring an image. When the camera is used for optical calibration, the camera is used for shooting the image of the calibration point, but the surface of the glass material is smooth, so that mirror reflection is easy to occur, and when an external light source irradiates the glass, strong reflected light or refracted light can be generated, so that the shooting of the camera is interfered, and the camera cannot shoot or can not clearly shoot the calibration point on the glass calibration plate; similarly, when the mark points projected by the 3D printing device are shot, the mark points are projected on the first surface of the glass calibration plate substrate by the light source of the 3D printing device, and the strong reflection and refraction phenomena can also occur when the light source of the 3D printing device irradiates on the glass, so that the mark points projected by the 3D printing device cannot be shot clearly by the camera, the precision of optical correction is not high, and the precision of the 3D printing device is influenced.
In order to solve the above problems, the inventor provides an optical calibration tool, wherein a calibration point is arranged on a first surface of a calibration plate substrate, a second surface of the calibration plate substrate faces to an illumination part, and a film covers the first surface. The mark points projected by the 3D printing equipment are directly projected onto the film, the mark points in the calibration plate can clearly form images on the film through the illumination part, when the optical calibration is carried out, the film covering surface is shot by the camera, and the surface roughness of the film covering is higher than that of the substrate of the calibration plate due to the film covering, the diffuse reflection can be generated when the light source irradiates the film covering, no strong reflected light can be generated, the light source of the 3D printing equipment and other external light sources can not directly irradiate the calibration plate, the problems of light reflection and refraction of the calibration plate are weakened, the mark points projected by the 3D printing equipment and the calibration points of the calibration plate can be clearly shot by the camera, and the accuracy of the optical calibration is ensured.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 is an exploded view of an optical calibration fixture according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a calibration plate in the optical calibration tool provided in fig. 1, wherein arrows indicate the light irradiation direction emitted by the light irradiation part.
With reference to fig. 1 and 2, the optical calibration tool 1 includes: an illumination unit 10; the calibration plate 20, the calibration plate 20 includes a calibration plate substrate 21 and a calibration point 22, wherein the calibration plate substrate 21 has a first surface 211 and a second surface 212 opposite to each other, the calibration point 22 is disposed on the first surface 211 of the calibration plate substrate 21, and the second surface 212 of the calibration plate substrate 21 faces the illumination portion 10; and the coating 30 covers the first surface 211 of the calibration plate substrate 21, and the surface roughness of the coating 30 is higher than that of the calibration plate substrate 21.
The calibration board 20 is used for optical calibration of the 3D printing apparatus, and the calibration points 22 in the calibration board 20 are used as calibration references in the optical calibration. The calibration point 22 is disposed on the first surface 211 of the calibration plate substrate 21, and during the optical calibration of the camera, the first surface 211 is used as a camera shooting surface, and since the first surface 211 is covered with the coating film 30, a surface of the coating film 30, which faces away from the calibration plate 20, is a camera shooting surface.
In this embodiment, the calibration plate substrate 21 is a glass substrate, the calibration points 22 are planar two-dimensional patterns, and the calibration points with high precision can be obtained by engraving in the glass substrate with laser, so that the precision of optical calibration is improved, and the printing precision of the 3D printing device is improved. In addition, the glass substrate is low in price, so that the cost can be saved.
In other embodiments, the calibration plate substrate 21 may also be made of resin, plastic, or the like.
In this embodiment, the calibration point 22 is a colored color block, is an opaque structure, and is disposed on the first surface 211 of the calibration plate substrate 21.
In this embodiment, the illumination portion 10 includes a plurality of L ED (light Emitting Diode) lamps, in other embodiments, the illumination portion 10 may further include other lamps capable of Emitting a stable light source, such as incandescent lamps, and the L ED lamps have the advantages of high brightness, long projection, energy saving, and the like, and can better project the calibration point 22 on the coating.
In this embodiment, the illumination portion 10 further includes a plurality of lamp strips, and the L ED lamps are fixed on the lamp strips, so that the L ED lamps are fixed by the lamp strips, which facilitates the assembly of the illumination portion 10, and the light emitted by the illumination portion 10 in the optical calibration process is relatively stable.
In other embodiments, the illuminating portion 10 may not include a light strip, and the L ED lights may be directly fixed at a desired position.
In this embodiment, the illumination portion 10 further includes a control device (not shown), and the control device can control the on/off of the illumination portion 10.
Because the lighting part 10 mainly functions to enable the calibration point on the calibration plate to form an image on the coating, when the calibration point on the calibration plate is shot, the lighting part is opened to emit light, and the lighting part can be closed in other processes, so that energy is saved.
In this embodiment, the control device may control the brightness of the illumination unit 10. When different cameras are used for calibration, the required light intensity is different, so that the brightness of the illumination part 10 can be adjusted through the control device to adapt to different cameras, the shooting effect of the cameras is better, and the calibration precision is improved.
In this embodiment, the control device is connected to the illuminating unit 10 by an electric wire, and controls the on/off state or the brightness of the illuminating unit by controlling the on/off state of the circuit and the magnitude of the current.
In this embodiment, the surface roughness of the coating film 30 is higher than the surface roughness of the calibration plate substrate 22.
Light is diffusely reflected on the surface of an object with high surface roughness, and is specularly reflected on the surface of a smooth object with low surface roughness, so that the reflected light is strong. The surface roughness of the covering film 30 is high, the light source of the 3D printing equipment or the external light source irradiates on the covering film to generate diffuse reflection, so that the strong reflection phenomenon is avoided, and the adverse effect caused by the reflection problem of the calibration plate substrate 22 on camera shooting is weakened.
In this embodiment, the coating film 30 should have a certain light transmittance, because the calibration point 22 of the calibration plate 20 is projected onto the coating film 30 through the illumination portion 10, if the coating film is made of a material having poor light-proof or light-transmittance, the image of the calibration point 22 on the coating film 30 cannot be displayed on the surface of the coating film 30 opposite to the calibration plate 20, and the camera cannot clearly capture the image of the calibration point 22. However, the light transmittance of the coating film 30 is not so high, and the light transmittance is so high that the effect of reducing the reflection phenomenon of the calibration plate substrate 21 is poor.
The cover film 30 is a material on the surface of which light is diffusely reflected, and includes a colored plastic film or a paper film.
In this embodiment, the calibration point 22 is disposed on the first surface 211 of the calibration plate substrate 21, the illumination portion 10 faces the second surface 212 of the calibration plate substrate 21, the coating film 30 covers the first surface 211, and light is irradiated from the second surface 212, so that when passing through the calibration plate substrate 21, since the distance between the calibration point 22 and the coating film 30 is close, an image of the calibration point 22 on the coating film 30 can be clearer.
In this embodiment, when the optical calibration tool performs optical calibration, the illumination portion 10 illuminates the second surface of the calibration plate substrate 21, and projects the calibration point 22 in the calibration plate 20 onto the coating film 30 covering the first surface of the calibration plate substrate 21, and since the coating film 30 has light transmittance, the calibration point 22 can clearly form an image on the coating film 30; when the 3D printing device projects the mark points, the mark points are directly projected on the covering film 30, because the covering film 30 is made of a material whose surface is diffusely reflected, there is no strong reflection and refraction effect, and the light source of the 3D printing device or other ambient light will not interfere with the shooting of the camera, the camera can clearly shoot the mark points 22 imaged on the covering film 30 by the calibration plate 20 and the mark points projected by the 3D printing device, and compare the mark points to correct the 3D printing device, thereby improving the printing precision of the 3D printing device.
With continuing reference to fig. 1, the optical calibration tool 1 further includes: a support part 40, the support part 40 including a base plate 41 and a support 42 perpendicular to the base plate 41.
In this embodiment, the bottom plate 41 and the supporting member 42 form an accommodating space 43, and a top of the accommodating space 43 is open, and the opening faces the second surface 212 of the calibration plate substrate 21.
In this embodiment, the illuminating unit 10 is installed in the accommodating space 43, specifically, the illuminating unit 10 is installed on the bottom plate 41 of the accommodating space 43, and an opening at the top of the accommodating space 43 allows the light emitted from the illuminating unit 10 to irradiate a calibration plate.
In this embodiment, a control device for controlling the light irradiation part 10 is mounted on the support part 40.
Since all the calibration points 22 need to be imaged on the coating film 30 during calibration, the illumination range of the illumination section 10 covers at least all the calibration points 22, and therefore the size of the opening accommodates at least all the calibration points 22.
In this embodiment, the supporting member 42 includes a plurality of side plates with the same height, and the side plates are disposed along the periphery of the bottom plate 41 and perpendicular to the bottom plate 41.
The side plates and the bottom plate 41 may be detachable or integrally formed, and when the side plates and the bottom plate 41 are integrally formed, the supporting portion 40 is integrally formed as a box body with an opening at the top.
In this embodiment, the side plates are used to support the calibration plate 20, the calibration plate 20 is directly placed on the side plates, and since the heights of the side plates are the same, the calibration plate 20 and the bottom plate 41 of the support portion 40 are parallel.
The advantage of the direct contact between the calibration plate 20 and the support portion 40 is that, on the one hand, the calibration plate is closer to the illumination portion, and the light intensity emitted by the illumination portion is sufficient, so that the imaging of the calibration point is clearer; on the other hand, in the actual calibration process, the calibration plate needs to be adjusted to be parallel to the horizontal plane, and the state of the calibration plate can be adjusted by directly adjusting the supporting part.
In other embodiments, the supporting member 42 may be a plurality of columns (not shown) with the same height, and the columns may be disposed at corner positions of the bottom plate 41, and support the calibration plate 20 through the columns.
With continued reference to fig. 1, a light uniformizing plate 11 is further provided between the illuminating section 10 and the calibration plate 20.
The light homogenizing plate 11 can uniformly diffuse the light emitted from the illuminating part 10 to the calibration plate 20, thereby improving the shooting quality of the camera. Due to the arrangement of the light homogenizing plate 11, the position distribution of the illumination part 10 in the accommodating space 43 does not need to be particularly limited, and only the illumination range can cover all the calibration points 22.
In this embodiment, the light homogenizing plate 11 is made of polycarbonate; in other embodiments, the material of the light homogenizing plate 11 may also be polymethyl methacrylate.
In this embodiment, the light homogenizing plate 11 is directly placed on the supporting member 42, and then the calibration plate 20 is placed on the light homogenizing plate 11.
With continued reference to fig. 1, the optical calibration tool 1 further includes a leveling mechanism 50, and the leveling mechanism 50 is used for making the calibration plate 20 parallel to the horizontal plane.
Since the 3D printing apparatus needs the calibration plate and the printing surface of the 3D printing apparatus to be located on the same horizontal plane when operating, the calibration plate 20 needs to be adjusted to be parallel to the printing surface of the 3D printing apparatus.
In this embodiment, the leveling mechanism 50 is installed on the bottom plate 41 of the supporting portion 40, and since the calibration plate 20 is parallel to the bottom plate 41, the bottom plate 41 is adjusted to be parallel to the horizontal plane, and correspondingly, the calibration plate 20 is parallel to the horizontal plane, and the printing surface of the 3D printing apparatus is always in a horizontal state, so that the calibration plate 20 is parallel to the printing surface of the 3D printing apparatus.
In this embodiment, the leveling mechanism 50 includes a plurality of columns with adjustable height.
In addition, a space for placing a level is left in the bottom plate 41 of the support portion 40. When leveling operation is performed, a level meter is placed on the bottom plate 41, the whole optical calibration tool 1 is placed on a workbench of 3D printing equipment, and when the level meter displays a level, the bottom plate 41 is parallel to the level by adjusting the height of a cylinder of the leveling mechanism 50.
Through the leveling mechanism 50, the optical calibration tool 1 can also be used in 3D printing equipment with uneven working surfaces or low levelness, and the problem of low calibration precision caused by the fact that a calibration plate is not parallel to a printing surface due to the fact that the working surfaces are uneven is solved.
Correspondingly, the embodiment of the present invention further provides a 3D printing apparatus (not shown), where the 3D printing apparatus includes: the optical calibration tool shown in fig. 1 and 2; the objective table is used for placing the optical calibration tool; a light projector for projecting a marker point on the cover film. The optical calibration tool has high calibration precision, so that the printing precision of the 3D printing equipment is improved.
When the optical calibration tool provided by the embodiment of the utility model is used, the optical calibration tool is firstly placed on the objective table, and the optical calibration tool is adjusted to enable the calibration plate to be parallel to the horizontal plane; opening the illumination part to enable the calibration point to form an image on the covering film; shooting an image of the calibration point on the covering film to obtain a calibration point image; turning off the illumination part, the light projector projecting a marker point of a 3D printing device on the coating; shooting the image of the mark point on the covering film to obtain a mark point image; and comparing the calibration point image with the marking point image to realize the calibration of the 3D printing equipment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (14)
1. The utility model provides an optics calibration frock which characterized in that includes:
an illumination section;
the calibration plate comprises a calibration plate substrate and calibration points, wherein the calibration plate substrate is provided with a first surface and a second surface which are opposite to each other, the calibration points are arranged on the first surface of the calibration plate substrate, and the second surface of the calibration plate substrate faces the illumination part;
and the coating covers the first surface of the calibration plate substrate, and the surface roughness of the coating is higher than that of the calibration plate substrate.
2. The optical calibration tool of claim 1, further comprising: the supporting part comprises a bottom plate and a supporting part perpendicular to the bottom plate, an accommodating space is formed by the supporting part and the bottom plate, the top of the accommodating space is in an opening shape, and the opening faces to the second surface of the calibration plate substrate.
3. The optical calibration tool of claim 2, wherein the supporting member comprises a plurality of side plates or columns with the same height, the side plates or columns are used for supporting the calibration plate, and the calibration plate is parallel to the bottom plate of the supporting portion.
4. The optical calibration tool of claim 2, wherein the illumination portion is installed in the accommodating space, and an illumination range of the illumination portion at least covers the calibration point.
5. The optical calibration tool of claim 1, wherein the illumination portion comprises a plurality of L ED lamps.
6. The optical calibration tool of claim 5, wherein the illumination portion further comprises a plurality of light strips, and the L ED lights are fixed on the light strips.
7. The optical calibration tool of claim 1, wherein a light homogenizing plate is further disposed between the illuminating portion and the calibration plate, and the light homogenizing plate uniformly diffuses light emitted from the illuminating portion onto the calibration plate.
8. The optical calibration tool of claim 1, wherein the calibration plate substrate is made of glass, resin or plastic.
9. The optical calibration tool of claim 1, wherein the cover film comprises a colored plastic film or a paper film.
10. The optical calibration tool of claim 7, wherein the light homogenizing plate is made of polycarbonate or polymethyl methacrylate.
11. The optical calibration tool of claim 2, further comprising: the leveling mechanism is arranged on the supporting part and enables the calibration plate to be parallel to the horizontal plane.
12. The optical calibration tool of claim 1, wherein the illumination portion further comprises a control device for controlling the on/off state of the illumination portion.
13. The optical calibration tool of claim 12, wherein the control device is further configured to adjust the brightness of the illumination portion.
14. A3D printing apparatus, comprising:
the optical calibration tool of any one of claims 1 to 13;
the objective table is used for placing the optical calibration tool;
a light projector for projecting a marker point on the cover film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921543686.3U CN211105636U (en) | 2019-09-17 | 2019-09-17 | Optical calibration tool and 3D printing equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921543686.3U CN211105636U (en) | 2019-09-17 | 2019-09-17 | Optical calibration tool and 3D printing equipment |
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| CN211105636U true CN211105636U (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110625936A (en) * | 2019-09-17 | 2019-12-31 | 上海联泰科技股份有限公司 | Optical calibration tool, 3D printing equipment and 3D printing optical calibration method |
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2019
- 2019-09-17 CN CN201921543686.3U patent/CN211105636U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110625936A (en) * | 2019-09-17 | 2019-12-31 | 上海联泰科技股份有限公司 | Optical calibration tool, 3D printing equipment and 3D printing optical calibration method |
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