Method and apparatus for producing a three-dimensional object
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United States of America Patent
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May 19, 1998
Grant Date -
N/A
app pub date -
Oct 23, 1996
filing date -
May 13, 1994
priority date (Note) -
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Abstract
When producing an object by subsequent solidification of material layers 1 at places corresponding to the object there is a problem of limited production speed because the scanning speed or laser power of the light beam scanning the material layer 1 cannot be increased at will, if the light beam 4 used for solidification is focused as required for exact resolution. According to the invention this problem is solved by providing a variable focusing device 8 in the light beam 4, whereby the focus of the light beam 4 can be varied during the solidification of the layer 1. Thus, a different focus, laser power and scanning speed can be used in different regions of the layer 1.
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