Plastic and nonmetallic article shaping or treating: processes – Stereolithographic shaping from liquid precursor
Patent
1994-04-25
1997-01-28
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Stereolithographic shaping from liquid precursor
118429, 118620, 118712, 156 64, 1562733, 1562735, 1562755, 1563071, 156378, 1563796, 2504921, 264 401, 264308, 36446827, 365106, 365107, 395119, 425135, 4251744, 427 8, 427510, 427512, 427553, 427554, 427555, B29C 3508, B29C 4102, B29C 4152
Patent
active
055975208
ABSTRACT:
A method and apparatus for making high resolution objects by stereolithography utilizing low resolution materials which are limited by their inability to form unsupported structures of desired thinness and/or their inability to form coatings of desired thinness. Data manipulation techniques, based on layer comparisons, are used to control exposure in order to delay solidification of the material on at least portions of at least some cross-sections until higher layers of material are deposited so as to allow down-facing features of the object to be located at a depth in the building material which is equal to or exceeds a minimum cure depth that can effectively be used for solidifying these features. Similar data manipulations are used to ensure minimum reliable coating thicknesses exist, above previously solidified material, before attempting solidification of a next layer. In addition, horizontal comparison techniques are used to provide enhanced cross-sectional data for use in forming the object.
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Hull Charles W.
Manners Chris R.
Smalley Dennis R.
VanDorin Stacie L.
Vorgitch Thomas J.
Smalley Dennis R.
Tentoni Leo B.
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