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:
Nov. 18, 2003
Filed:
Dec. 05, 2001
Hiroshi Sakai, Nagano, JP;
Kabushiki Kaisha Sankyo Seiki Seisakusho, Nagano, JP;
Abstract
The surface shape measuring apparatus comprises a polar coordinate conversion portion for converting the orthogonal coordinate data representing the surface shape of a measurement object into the polar coordinate data, an approximate expression calculating portion for calculating an approximate expression on the basis of the polar coordinate data employing the Zernike's polynomial, an angle calculating portion for calculating angles representing the generating line and principal directions, a first approximate sectional shape calculating portion for calculating approximate sectional shapes in the generating line and principal line directions based on the calculated angles, a second approximate sectional shape calculating portion for calculating the center coordinates and the radiuses of curvature for the approximate sectional shapes, and a sectional shape data calculating portion for calculating the numerical data of approximate sectional shapes in the generating line and principal line directions on the basis of the center coordinates and the radiuses of curvature.