Importance

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Abstract

A three-dimensional object is constituted by successive solid layers each formed by selectively exposing an unexposed layer of a photohardenable composition to actinic radiation. The unexposed layer of the photohardenable composition is formed on the flexible sheet belt. The flexible sheet belt is brought into close and parallel relationship with a flat support surface of a base plate member facing downwardly, thereby laminating the unexposed layer of the photohardenable composition to the flat support surface of the base plate member of the solid layer previously formed. A positioning plate member is positioned in such a manner that the positioning plate member faces the base plate member through the flexible sheet belt and is brought into contact with the flexible sheet belt, so that the unexposed layer of the photohardenable composition is supported and positioned by the positioning plate member through the flexible sheet belt. The laminated unexposed layer of the photohardenable composition is selectively exposed to the actinic radiation through the positioning plate member and the flexible sheet belt to form a new solid layer and an unhardened layer of the photohardenable composition. After the positioning plate member is removed from the flexible sheet belt, the flexible sheet belt with the unhardened layer of the photohardenable composition is separated from the newly formed solid layer.

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First Claim