公开(公告)号：US20230302730A1

公开(公告)日：2023-09-28

申请号：US17702153

申请日：2022-03-23

Applicant: DENTSPLY SIRONA Inc.

Inventor： Christian STAHL ,  Johannes KRUG

IPC: B29C64/277 ,  G02B26/08 ,  G02B27/09 ,  B33Y10/00 ,  B33Y30/00 ,  B29C64/135

CPC classification number: B29C64/277 ,  G02B26/0833 ,  G02B27/0905 ,  G02B27/0977 ,  B33Y10/00 ,  B33Y30/00 ,  B29C64/135 ,  B29L2031/753

Abstract: A 3D printing system that includes a first light source and a second light source. The first light source emits a first light beam having a first wavelength that initiates polymerization of a photosensitive resin and the second light source emits a second light beam having a second wavelength that inhibits polymerization of the photosensitive resin. A dichroic mirror is placed in an optical path of the 3D printing system to superimpose the first and second beams, a digital micromirror device (DMD) spatially structures the superimposed first and second light beams into a spatial pattern as a spatially structured superimposed light beam, and a single optical system in the optical path projects the spatially structured superimposed light beam onto the photosensitive resin.