A projection distortion correction method for a light-curing 3D printer
A 3D printer and light curing technology, applied in the field of 3D printing, can solve the problems of deformed projection pattern, unsatisfactory, final result of deformation, etc., to achieve the effect of overcoming deformity
Active Publication Date: 2020-04-07
BOOMING TECH LTD
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Problems solved by technology
However, in practical applications, due to the error of the projector itself and the error of equipment installation, it is difficult to keep the projection optical axis perpendicular to the forming table, that is, the image plane, and the projection pattern is prone to distortion and deformation, resulting in irregular surface exposure molding results. The deformation of the final result is unsatisfactory
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[0024] This embodiment provides a method for correcting projection distortion of a photocuring 3D printer, the flow chart of the method is as follows figure 1 As shown, first, an original model is printed out by using a light-curing 3D printer based on DLP technology, such as figure 2 As shown; then use precision instruments to measure the size data in the original model, the size data includes the vertical distance and horizontal distance of the four corner points of the original model relative to the center of the model; as image 3 As shown, R1, R2, R3, and R4 are the four corner points of the original model, because the square in the middle is found to have the smallest deformation in the observation of the actual printing results, and it can be used as a reference point to accurately calculate each The coordinate value of the corner point. Take the corner point R1 as an example: R1.x=TH1-(TM1 / 2), R1.y=LH1-(LM1 / 2), the coordinate values of R2, R3 and R4 relative to the...
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The invention discloses a method for correcting projection distortion of a light-curing 3D printer. First, a light-curing 3D printer based on DLP technology is used to print an original model, and then the distances between four vertices in the original model and the center of the model are measured, and then according to the projection According to the resolution specifications of the instrument, the distance is converted into pixel coordinates in units of pixels, and the correlation calculation is carried out according to the coordinates of the four points measured and the coordinates of the corresponding four points in the target model, and the distance between the original model and the target model is obtained. The mapping relationship of each pixel in each slice pattern, that is, the homography matrix from the projection system to the printing platform, and then use the geometric transformation principle to perform geometric pre-distortion on the slice pattern of the original model and then print with the pre-distorted slice pattern. Whether the printing result is within the allowable range of error, otherwise repeat the above steps. The method is of great significance for realizing large-scale printing splicing and part printing assembly, and has high practical value.
Description
technical field [0001] The invention relates to the technical field of 3D printing, in particular to a method for correcting projection distortion of a photocuring 3D printer. Background technique [0002] A main branch of 3D printing technology is light-curing 3D printing technology, which uses the principle of curing liquid photosensitive resin after being irradiated with light beams, so that materials can be accumulated point by point or layer by layer. Stereolithography 3D printing technology is mainly divided into SLA and DLP projection technology, among which SLA is called stereolithography molding technology, which uses laser beams to quickly scan and irradiate the photosensitive resin point by point to make it solidify and shape. SLA technology can mold other materials other than photosensitive resin, and has the characteristics of wide application. DLP projection technology is to project the entire layer of image onto the photosensitive resin through the projection...
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IPC IPC(8): G06T5/00G06T7/70
CPCG06T7/70G06T2207/30204G06T5/80
Inventor 陈国大周绍林陈斌徐朔马旭刚
Owner BOOMING TECH LTD