Spectacle Lens Surfacing Fixed Rotation Speed Control
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Solution Overview
Problem
Current surfacing processes for spectacle lenses, particularly those with complex surfaces combining toroidal and prismatic components, face challenges in achieving optimal productivity and conformity due to varying rotation speeds and scanning parameters, which are often determined through trial and error, leading to inefficiencies.
Innovation Solution
A process that determines a fixed rotation speed for surfacing spectacle lenses by calculating the largest difference in altitude geometric values and incorporating a cylinder geometric value at a far-vision control point, allowing for the determination of adequate surfacing parameters that balance productivity and conformity, independent of surface complexity, using standard optical calculation tools and a simple calibration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a very low surfacing speed is used, then the conformity of complex surfaces is improved, but the productivity deteriorates
Solution Approach 1:
The patent changes the rotation speed parameter from variable to fixed based on surface complexity classification. By categorizing surfaces into complexity levels (A, B, C, D) and assigning fixed rotation speeds to each level, the system achieves both high conformity for complex surfaces and maintained productivity through optimized fixed speeds, eliminating the need for trial-and-error parameter adjustment.
2Productivity
If a high surfacing speed is used, then the productivity is improved, but the conformity of the surface deteriorates
Solution Approach 1:
The patent optimizes rotation speed parameters by establishing fixed speeds corresponding to different surface complexity levels. This parameter standardization allows high productivity through optimized speeds while ensuring conformity is maintained through the fixed speed selection based on pre-assessed surface complexity, eliminating the trade-off between speed and precision.
3Manufacturing precision
If trials are carried out to determine optimal surfacing speed, then the conformity is improved, but the time consumption increases
Solution Approach 1:
The patent performs preliminary classification of surface complexity before the actual surfacing operation. By pre-categorizing surfaces into complexity levels (A, B, C, D) and pre-determining the corresponding fixed rotation speeds, the system eliminates the need for time-consuming trials during production, achieving both optimal conformity and reduced time consumption.
4Device complexity
If the rotation speed is fixed based on largest difference between mean sphere geometric values, then the process is simplified, but it cannot account for prismatic components and other complex surface features
Solution Approach 1:
The patent enhances the parameter basis for rotation speed determination by incorporating multiple geometric characteristics including prismatic components, toroidal components, and other complex surface features. The system calculates the largest difference between altitude geometric values across these diverse surface features and uses this comprehensive parameter, along with cylinder geometric values, to determine fixed rotation speeds that adapt to various surface complexities while maintaining process simplicity.
Data Source
AI summary
A method of surfacing a surface of a spectacle lens, includes a step of determining a fixed rotation speed (Vrot) of the lens based on geometric characteristics of the surface, wherein the step of determining the rotation speed (Vrot) includes the following steps: generating (102), based on the geometric characteristics of the surface (12), a file of geometric altitude values of the surface, the file being centered on a zero geometric altitude value at a predetermined reference point; determining (103) a value representative of the greatest difference (MaxHk) in geometric altitude values on the surface; deducing (107) the rotation speed (Vrot) from the value of the greatest difference (MaxHk) in geometric altitude values on the surface and from a geometric value of the cylinder at a predetermined far-vision control point.