Title:
【発明の名称】三次元物体の形成方法および装置
Document Type and Number:
Japanese Patent JP2963478
Kind Code:
B2
Abstract:
An improved stereolithography system for generating a three-dimensional object by creating a cross-sectional pattern of the object to be formed at a selected surface of a fluid medium capable of altering its physical state in response to appropriate synergistic stimulation by impinging radiation, particle bombardment or chemical reaction, information defining the object being structurally specified to reduce curl, stress and distortion in the ultimately formed object, the successive adjacent laminae, representing corresponding successive adjacent cross-sections of the object, being automatically formed and integrated together to provide a step-wise laminar buildup of the desired object, whereby a three-dimensional object is formed and drawn from a substantially planar surface of the fluid medium during the forming process. A stereolithographic distortion known as curl is defined, and several techniques to eliminate or reduce curl are described, including dashed line, bent line, secondary structure, rivets, and multi-pass techniques. In addition, a quantitative measurement of curl known as the curl factor, and a test part known as a quarter cylinder are described, which together can be used to measure the effectiveness of the above techniques in reducing curl.
Inventors:
HULL CHARLES WILLIAM (US)
LEWIS CHARLES WILLIAM (US)
FREED RAYMOND SAMUEL (US)
SPENCE STUART THOMAS (US)
VINSON WAYNE ALLAN (US)
SMALLEY DENNIS ROLLETTE (US)
LEWIS CHARLES WILLIAM (US)
FREED RAYMOND SAMUEL (US)
SPENCE STUART THOMAS (US)
VINSON WAYNE ALLAN (US)
SMALLEY DENNIS ROLLETTE (US)
Application Number:
JP50850189A
Publication Date:
October 18, 1999
Filing Date:
April 17, 1989
Export Citation:
Assignee:
3D SYSTEMS INC (US)
International Classes:
B29C35/08; B29C67/00; B44B1/00; G03F7/00; G03F7/20; G06F17/50; B29K105/24; (IPC1-7): B29C67/00
Domestic Patent References:
| JP1237122A | ||||
| JP63145015A |
Other References:
【文献】米国特許4575330(US,A)
【文献】欧州公開250121(EP,A2)
【文献】欧州公開250121(EP,A2)
Attorney, Agent or Firm:
Seiji Yanagida (1 person outside)