US 12,263,648 B2
Techniques for contamination detection in additive fabrication and related systems and methods
Shane Wighton, Raleigh, NC (US); Andrew M. Goldman, Stow, MA (US); Henry Whitney, Weymouth, MA (US); and Justin Keenan, Lexington, MA (US)
Assigned to Formlabs, Inc., Somerville, MA (US)
Filed by Formlabs, Inc., Somerville, MA (US)
Filed on Jun. 20, 2023, as Appl. No. 18/337,650.
Application 18/337,650 is a continuation of application No. 16/811,567, filed on Mar. 6, 2020, granted, now 11,679,561.
Claims priority of provisional application 62/815,728, filed on Mar. 8, 2019.
Prior Publication US 2023/0405938 A1, Dec. 21, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B29C 64/393 (2017.01); B29C 64/129 (2017.01); B29C 64/236 (2017.01); B29C 64/245 (2017.01); B29C 64/268 (2017.01); B29C 64/286 (2017.01); B29C 64/386 (2017.01); B33Y 10/00 (2015.01); B33Y 30/00 (2015.01); B33Y 50/00 (2015.01); B33Y 50/02 (2015.01); G01N 21/94 (2006.01); G01N 21/958 (2006.01)
CPC B29C 64/393 (2017.08) [B29C 64/129 (2017.08); B29C 64/236 (2017.08); B29C 64/245 (2017.08); B29C 64/268 (2017.08); B29C 64/286 (2017.08); B29C 64/386 (2017.08); B33Y 50/00 (2014.12); G01N 21/94 (2013.01); G01N 21/958 (2013.01); B33Y 10/00 (2014.12); B33Y 30/00 (2014.12); B33Y 50/02 (2014.12); G01N 2021/945 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An additive fabrication device configured to form layers of solid material on a build surface, the additive fabrication device comprising:
a container;
a movable stage arranged below the container and configured to move in a first direction below the container, the movable stage comprising:
an optical window;
a light source below the optical window arranged to direct light towards the optical window; and
at least one light sensor below the optical window arranged to receive light emitted by the light source and reflected through the optical window;
at least one processor; and
at least one computer readable medium comprising instructions that, when executed by the at least one processor:
control the light source to direct light through the optical window; and
detect a failure mode of the additive fabrication device based at least in part on the light received by the at least one light sensor.