Patent ID: 11919228
Assignee: FORMLABS, INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method of detecting a contaminated region of a film in an additive fabrication device, the method comprising:
emitting light from a light source included in a movable stage, wherein the movable stage is configured to move in a first direction with respect to the additive fabrication device;
directing the emitted light by an optical scanning device included in the movable stage to a plurality of locations on a film of a liquid container, wherein the film corresponds to a curing plane for the additive fabrication device;
detecting, by a light sensor, different intensities of light reflected from the film for each of the plurality of locations on the film;
detecting one or more contaminants on the film by comparing the different intensities of the reflected light from the film;
in response to detecting the one or more contaminants on the film, calculating respective locations of the one or more contaminants on the film; and
moving the container relative to a build platform of the additive fabrication device during a layer curing process, said moving being based on the calculated location of at least one of the one or more contaminants on the film.