초록 ▼

An improved stereolithographic process is provided in which the formation of a thin walled three-dimensional object in a reservoir of liquid ultraviolet-curable ethylenically unsaturated material using a support is positioned immediately beneath the upper surface of the liquid reservoir with that up

An improved stereolithographic process is provided in which the formation of a thin walled three-dimensional object in a reservoir of liquid ultraviolet-curable ethylenically unsaturated material using a support is positioned immediately beneath the upper surface of the liquid reservoir with that upper surface being exposed to ultraviolet light in a pattern to solidify the liquid at and near the upper surface in a series of cross-sections of the desired three-dimensional object, one atop the other. In this way there is formed a series of superposed layers which adhere to one another to build the desired three-dimensional object within the liquid reservoir. The improvement comprises, stopping the exposure at any portion of the surface in the formation of said layers and then repeating the exposure at least once again in the production of each surface layer so that the strength and solvent resistance of the formed object are increased and its distortion is minimized. The ultraviolet exposure of each surface layer is preferably carried out as a series of rapid repeated scans of a computer-directed focused laser.

대표청구항 ▼

In a method for the formation of a thin walled three-dimensional object in a reservoir of liquid ultraviolet-curable ethylenically unsaturated material and in which a support is positioned immediately beneath the upper surface of the liquid reservoir with said upper surface being exposed to ultravio

In a method for the formation of a thin walled three-dimensional object in a reservoir of liquid ultraviolet-curable ethylenically unsaturated material and in which a support is positioned immediately beneath the upper surface of the liquid reservoir with said upper surface being exposed to ultraviolet light in a pattern of line exposures to solidify the liquid at and near said upper surface in a series of cross-sections of the desired three-dimensional object, one atop the other, and thus form a series of superposed layers which adhere to one another to build said three-dimensional object within the liquid reservoir, the improvement comprising, stopping the line exposure at any portion of the surface in the formation of said series of superposed layers and then repeating the line exposure at least once again in the production of each said superposed layer so that the strength and solvent resistance of the formed object are increased and its distortion is minimized. In a method for the formation of a three-dimensional object in a reservoir of liquid ultraviolet-curable ethylenically unsaturated material and in which a support is positioned immediately beneath the upper surface of the liquid reservoir with said upper surface being exposed to light effective to polymerize said ehtylenically unsaturated material in a pattern of line exposures to solidify the liquid at and near said upper surface in a series of cross-sections of the desired three-dimensional object, one atop the other, and thus form a series of superposed layers which adhere to one another to build said three-dimensional object within the liquid reservoir, the improvement comprising, stopping the line exposure at any portion of the surface in the formation of said series of superposed layers and then repeating the line exposure at least once again in the production of each said superposed layer so that the strength and solvent resistance of the formed object are increased and its distortion is minimized.