Patent ID: 11934743
Assignee: MLOPTIC CORP.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for measuring the surface shape of a toric mirror, said method comprising:
(a) establishing a Computer-Aided Design (CAD) model of the toric mirror using three-dimensional (3D) modeling software according to parameter information of the toric mirror, wherein said establishing step comprises modeling the toric mirror, the curvature radii of two curved surfaces of the toric mirror are R1 and R2, the corresponding axes of the two curved surfaces are perpendicular to each other, a circular arc with a radius of R2 is constructed in a 3D modeling software, the circular arc is rotated 360° around the axis of a distance of R1 to obtain the CAD model of the toric mirror according to the size of the toric mirror and stretching and cutting the toric mirror in the 3D modeling software to obtain the CAD model of the toric sub-mirror;
(b) importing the CAD model into a three-coordinate machine software based on a three-coordinate machine to measure and construct geometric characteristics of the toric mirror;
(c) establishing the workpiece coordinate system consistent with the CAD model coordinate system, wherein said step (b) and said establishing step of said step (c) comprise taking the geometric center point of the toric sub-mirror as the coordinate origin, establishing a new coordinate system and outputting the toric sub-mirror CAD model in the new coordinate system, importing the toric sub-mirror CAD model into the three-coordinate machine software based on the three-coordinate machine system, measuring the geometric characteristics of the solid toric mirror using the three-coordinate machine, establishing the workpiece coordinate system and the workpiece coordinate system is consistent with the coordinate system of the CAD model;
(d) performing scanning measurement on the toric mirror using the three-coordinate machine to yield a scanning result and to measure the surface of the toric mirror to obtain the X, Y, Z data and the ΔX, ΔY and ΔZ data by comparison with the toric sub-mirror CAD model and performing a two-dimensional plane fitting to the ΔZ data using a data processing software and subtracting the fitting plane from the ΔZ data and displaying a graph of surface difference data to obtain the surface error distribution of the toric mirror; and
(e) comparing said scanning result with theoretical values to obtain measurement result data.