Patent ID: 7670541

Claim:
An optical shaping apparatus configured to irradiate light according to the cross-sectional shape data of a three-dimensional model on the surface of a light hardening resin to form a hardening layer, and layer said hardening layer to shape said three-dimensional model, comprising: data generating means configured to divide the cross-sectional shape data of said three-dimensional model according to work small areas obtained by dividing a work entire area where optical shaping work is performed into a plurality of areas, and generate work small area data which is cross-sectional shape data corresponding to said work small areas; enlarging means configured to enlarge said work small area data with offset width based on the contracting ratio of said light hardening resin; and one-shot exposing means configured to subject areas, which are wider than said work small areas on the surface of said light hardening resin by said offset width, to one-shot exposure based on said work small area data enlarged by said enlarging means to form said hardening layer for each of said work small areas.