The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 1995
Filed:
Jun. 28, 1994
Miwa Ooka, Tokyo, JP;
Tetsuzo Kuragano, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
Methods for generating free curves and sculptured surfaces illustratively for use with a computer aided design/computer aided manufacturing (CAD/CAM) apparatus whereby Bezier curves and surfaces are readily generated with reference to point sequences, point groups and surfaces. In operation, a starting point and an end point for a sequence of points are set as nodes, and a free curve is temporarily established thereby. Then control points are repeatedly established to minimize the shortest distances between the points in the sequence and the free curve. By use of the coordinates of a plurality of points, the shortest distance is found between each of these points and a reference patch. The internal control points are set so as to minimize the total sum of these shortest distances. When a patch is generated whose external shape is represented by a plurality of points, with another plurality of points also set on the reference patch for modification, a Bezier surface is generated with respect to these point groups and surfaces.