US 12,064,918 B2
Stereolithography apparatus for preventing adhesion of a 3D-object to the vat through oscillatory excitations
Thomas Hasenzahl, Darmstadt (DE)
Assigned to DENTSPLY SIRONA INC., York, PA (US)
Appl. No. 17/435,597
Filed by DENTSPLY SIRONA inc., York, PA (US)
PCT Filed Mar. 11, 2020, PCT No. PCT/EP2020/056500
§ 371(c)(1), (2) Date Sep. 1, 2021,
PCT Pub. No. WO2020/182881, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 19020125 (EP), filed on Mar. 14, 2019.
Prior Publication US 2022/0152915 A1, May 19, 2022
Int. Cl. B29C 64/124 (2017.01); B29C 64/30 (2017.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B33Y 40/00 (2020.01)
CPC B29C 64/124 (2017.08) [B29C 64/30 (2017.08); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 40/00 (2014.12)] 5 Claims
OG exemplary drawing
 
1. A stereolithography apparatus for generating a three-dimensional object from a photocurable substance, comprising: a vat for storing the photocurable substance; a platform for supporting the three-dimensional object, wherein the platform is movable relative to the vat; an optical unit for sequentially projecting layered images towards the photocurable substance for hardening the photocurable substance deposited between the three-dimensional object and the bottom of the vat; an oscillation unit and a control unit configured to control the oscillation unit to horizontally oscillate the vat concomitantly with the projection of the layered images with an amplitude that is smaller than the pixel size of the layered images in the horizontal direction for preventing adhesion of the three-dimensional object to the bottom of the vat,
wherein the control unit is further configured to control the oscillation unit to oscillate with the vat with a frequency which is equal to or higher than the exposure frequency of the layered images such that a blurring of the 3D object is reduced relative to a blurring obtained without oscillating the vat with the frequency.