公开(公告)号：JPH0593602A

公开(公告)日：1993-04-16

申请号：JP5002992

申请日：1992-03-06

Applicant: ESSILOR INT

Inventor： ARAN SHIYANSABOAARU

IPC: G01B7/28 ,  B23Q33/00 ,  B24B9/14 ,  B24B17/02 ,  G01B7/012 ,  G01B21/00 ,  G02C5/00

Abstract: PURPOSE: To avoid the pre-deformation of a spectacle rim metal etc., by mathematically drawing the coordinate values at which the pressing force of a contact feeler becomes zero from two systematically read continuous coordinate values at which the pressing force of the feeler does not become zero. CONSTITUTION: The head 14 of a contact feeler 12 is pressed against the rear side of the rim metal or rim frill 10 of a spectacle frame 11 to be read for contour with a specific force F and the coordinate values of the feeler 12 are recorded whenever the feeler 12 is pressed. The local deformation of the rim metal or rim frill 10 inevitably occurs when the feeler 12 is pressed against the rim metal or rim frill 10 with the force F. It is presumed that the local deformation stays within the elastic limit of the rim metal or rim frill 10. By systematically reading two continuous coordinate values, a first set value F1 at which the pressing force F does not become zero and a second set value F2 at which the force F does not become zero and which is different from the first value F1 are obtained. The coordinates of the set value F0 at which the force F of the feeler 12 becomes zero is mathematically drawn from the two read coordinate values.