Optical sensing techniques for calibration of an additive fabrication device and related systems and methods
First Claim
1. An additive fabrication device configured to fabricate an object by forming layers of solid material on a build platform, the solid material being formed from a liquid photopolymer, the additive fabrication device comprising:
- at least one light source;
at least one sensor;
a container configured to hold the liquid photopolymer during said fabrication of the object, wherein a surface of the container includes at least a first calibration pattern;
a dispenser configured to dispense the liquid photopolymer into the container;
a build platform arranged above the container and configured to be raised and lowered into and out of the container; and
at least one processor configured to;
direct the at least one light source to the first calibration pattern;
measure, via the at least one sensor, an intensity of light scattered from the first calibration pattern; and
determine a position of the container based at least in part on the measured intensity of light.
3 Assignments
0 Petitions
Accused Products
Abstract
Techniques of optically sensing fiducial targets, such as calibration patterns, within an additive fabrication device are provided. In some embodiments, fiducial targets may be disposed on a structure configured to contact source material of the additive fabrication device, the source material being a material from which the device is configured to fabricate solid objects. Indirect sensing means may be employed such that light emitted from a light source of the additive fabrication device scatters from the surface of a fiducial target. At least some of this scattered light can be measured by a sensor and used to determine a position of the fiducial target. In some embodiments, the fiducial target may be configured to move relative to the light source and/or sensor to provide additional information on the target'"'"'s position via the light scattered from its surface.
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Citations
12 Claims
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1. An additive fabrication device configured to fabricate an object by forming layers of solid material on a build platform, the solid material being formed from a liquid photopolymer, the additive fabrication device comprising:
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at least one light source; at least one sensor; a container configured to hold the liquid photopolymer during said fabrication of the object, wherein a surface of the container includes at least a first calibration pattern; a dispenser configured to dispense the liquid photopolymer into the container; a build platform arranged above the container and configured to be raised and lowered into and out of the container; and at least one processor configured to; direct the at least one light source to the first calibration pattern; measure, via the at least one sensor, an intensity of light scattered from the first calibration pattern; and determine a position of the container based at least in part on the measured intensity of light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification