Plastic and nonmetallic article shaping or treating: processes – Stereolithographic shaping from liquid precursor
Patent
1999-02-08
2000-11-28
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Stereolithographic shaping from liquid precursor
264 406, 264308, 264406, 264409, 264410, B29C 3508, B29C 4102
Patent
active
061531421
ABSTRACT:
A rapid prototyping and manufacturing (e.g. stereolithography) method and apparatus for making three-dimensional objects with enhanced control of the temperature of the build environment. A modulated control signal is supplied to a heating element based on a difference between a desired build temperature and a detected temperature. The modulated signal result in the heater supplying, on average, more energy to the build chamber when the temperature difference is large and supplying, on average, less energy to the build chamber when the difference is small. The detection of the build chamber temperature may occur at one or more locations. If multiple locations are used, the detected temperatures may be averaged, or otherwise combined, to derive a single difference value that will be used to control the heater. Alternatively, the multiple detected temperatures may be used to produce multiple difference values that can in turn be used to control the quantity of heat applied directly to different locations in the build environment by either using multiple heaters or multiple controllable ducts.
REFERENCES:
patent: 5427733 (1995-06-01), Benda et al.
Bishop Raymond J.
Chari Arvind
Schoelen Joseph F.
3-D Systems, Inc.
D'Alessandro Ralph
Smalley Dennis R.
Tentoni Leo B.
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