Method and apparatus for producing a stepless 3-dimensional obje

Details Method and apparatus for producing a stepless 3-dimensional obje Method and apparatus for producing a stepless 3-dimensional obje

1992-02-13

1993-06-08

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 401, 4251744, 21912125, 21912128, B05D 306, B29C 3508

Patent

active

052176533

ABSTRACT:
A method and apparatus for producing a stepless 3-dimensional object by stereolithography, wherein a mathematical representation of the object is stored and dissected so as to generate a mathematical representation of a first laminate thereof, and a representative slope of the side wall surface of the first laminate at a plurality of different coordinates along the side wall surface is determined. The height of the first laminate is optimized by increasing the height whilst minimizing any deviation between the representative slope and the mathematical representation of the side wall surface. The liquid medium is irradiated with a beam of radiation at an angle representative of the uniform slope, and the irradiated liquid medium is allowed to polymerize and harden. The cured laminate is displaced relative to a surface of the liquid, and the process is repeated as required in respect of subsequent contiguous laminates. The apparatus includes a carriage having four degrees of freedom of movement for directing an optical fiber towards the liquid medium at a predetermined angle equal to the representative slope of the side wall.

REFERENCES:
patent: 4575330 (1986-03-01), Hull
patent: 4801477 (1989-01-01), Fudim
patent: 5014207 (1991-05-01), Lawton
patent: 5093552 (1992-03-01), Torii et al.
"Automatic Method for Fabricating a Three-Dimensional Plastic Model with Photo-Hardening Polymer" by H. Kodama, Am. Institute of Physics, No. 11, 1981, pp. 1770-1773.
"Solid Object Generation " by A. J. Herbert, Journal of Applied Photographic Engineering, vol. 8, No. 4, 1982.

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