US 12,420,486 B2
Multi-scale system for projection micro stereolithography
Chunguang Xia, San Diego, CA (US); and Jiawen Xu, Shenzhen (CN)
Assigned to BMF Material Technology Inc., Shenzhen (CN)
Appl. No. 18/033,405
Filed by BMF Material Technology Inc., Shenzhen (CN)
PCT Filed Oct. 21, 2021, PCT No. PCT/IB2021/059731
§ 371(c)(1), (2) Date Apr. 24, 2023,
PCT Pub. No. WO2022/084921, PCT Pub. Date Apr. 28, 2022.
Claims priority of provisional application 63/104,867, filed on Oct. 23, 2020.
Prior Publication US 2023/0398739 A1, Dec. 14, 2023
Int. Cl. B29C 64/277 (2017.01); B29C 64/124 (2017.01); B29C 64/393 (2017.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B33Y 50/02 (2015.01)
CPC B29C 64/277 (2017.08) [B29C 64/124 (2017.08); B29C 64/393 (2017.08); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 50/02 (2014.12)] 18 Claims
OG exemplary drawing
 
1. A method for 3D printing, the method comprising:
generating, on a computer, a 3D digital model of a sample to be printed, slicing the 3D digital model into a sequence of images, wherein each image of the sequence of images represents a layer of the 3D digital model, and transferring a first image from the sequence of images from the computer to a micro display chip of an optical light engine comprising the micro display chip and a light source;
projecting the first image along with light from the optical light engine through a projection lens of a multi-projection lens complex onto a printing material; and
causing the printing material in bright areas of the first image as projected to be polymerized while dark areas of the first image as projected to remain liquid; wherein
the optical light engine comprises the micro display chip and the light source; and
the multi-projection lens complex comprises two or more projection lenses with different imaging ratios, wherein the first image and the light are projected through only one projection lens at a time.