Spectacle Lens Edging Size Correction via Parameter Adjustment
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Solution Overview
Problem
Existing lens edging systems face challenges in accurately adjusting spectacle lens sizes without collapsing the outer shape, as current methods like adjusting axis distance can only correct sizes in units of the edging tool, failing to respond to individual lens materials and leading to precision issues.
Innovation Solution
A system that uses three-dimensional edging locus data and a measurement device to adjust spectacle lens sizes by correcting calculation parameters based on measured and theoretical values, storing correction values specific to lens materials and edging tools, and updating these values based on edging history data to maintain precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If axis distance adjustment is performed to correct edging size, then edging size can be corrected in unit of edging tool, but the outer shape of the spectacle lens collapses
Solution Approach 1:
The invention segments the correction approach by separating size adjustment from shape preservation. Instead of adjusting the axis distance which affects the entire lens geometry, the system uses calculation parameter correction that specifically targets size deviations while maintaining the original outer shape characteristics. This is achieved by storing and applying correction values for calculation parameters (like tool diameter) rather than physically adjusting the axis position.
Solution Approach 2:
The invention changes the parameters used for calculation rather than the physical setup. By storing correction values for calculation parameters (tool diameter, radius of curvature) and applying them during the calculation of edging locus data, the system achieves size correction without altering the physical axis distance or lens holder configuration, thereby preserving the outer shape.
2Productivity
If axis distance adjustment is performed per edging tool, then size correction is applied to all lenses, but the adjustment cannot respond to individual lens material variations
Solution Approach 1:
The invention applies local quality by creating material-specific correction values. Different correction values are stored and applied based on the lens material type (resin, glass, etc.), allowing each material to receive customized correction tailored to its specific edging characteristics. This enables precise response to individual lens material variations while maintaining efficient batch processing capabilities.
3Ease of manufacture
If edging is performed without calculation parameter correction, then edging process is simple, but edging size deviates from desired range due to tool wear or clogging
Solution Approach 1:
The invention implements self-service through automatic correction value application. The edging size management device automatically retrieves the appropriate correction value based on lens material and edging tool type, and applies it to the calculation parameters without requiring manual intervention. This maintains process simplicity while ensuring continuous precision despite tool wear or clogging.
Solution Approach 2:
The system incorporates feedback mechanisms where edging history data is stored and used to determine appropriate correction values. By referencing previous edging results and tool performance data, the system dynamically adjusts calculation parameters to compensate for tool wear or clogging, maintaining precision without complicating the edging process.
Data Source
AI summary
A lens edging system includes: an edger configured to perform edging to a spectacle lens in accordance with three-dimensional edging locus data obtained from edging shape data by calculation; a three-dimensional circumferential length measurement device configured to measure a circumferential length of the spectacle lens edged by the edger; and an edging size management device configured to correct a calculation parameter used for calculating the edging locus data, based on a difference between a measured circumferential length obtained by a three-dimensional circumferential length measurement device, and a theoretical circumferential length obtained by calculation.