Patent ID: 7483807
Filing Date: 2009-01-27
Classification: G01B,G06T

Abstract:
1. A form measuring device comprising: a measuring section having two straightedge rules for pairing either one of the straightedge rules with any of edges of an object to be measured, which has a flat polygonal form, so as to oppose to each other, and measuring the space therebetween at a plurality of sampling points to obtain measurement data, said measuring section having a length measuring sensor for measuring a space between each straightedge rule and an edge of said object to be measured, said length measuring sensor including a function value setting section for setting form-function values, which indicates distances from references lines respectively set for each edge of said object to be measured and said straightedge rules to said straightedge rules and the edges of said object to be measured at sampling points, and angle-function values, which indicates internal angles of said object to be measured and an angle formed by said straightedge rules; a simultaneous equation deriving section for deriving simultaneous equations for pairs of said straightedge rules and any edge of said object to be measured using an angle formed by the reference lines for said two straightedge rules and an internal angle of said object to be measured and assuming that the distance from each straightedge rule to an edge of said object to be measured is equal to the sum of a distance from a reference line for each straightedge rule to a reference line for the edge of the object to be measured and said form-function values and also that a relation between one of the straightedge rules and an edge of said object to be measured is expressed by a relation between the other of said straightedge rules and another edge of said object to be measured; and a simultaneous equation processing section for processing the derived simultaneous equations.