Eyeglass Frame Bezel Shape Determination Method
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Solution Overview
Problem
Existing methods for determining the shape of eyeglass frame bezels are not accurate enough, leading to potential mechanical interference between lenses and frames, which can cause deformation or make lens mounting impossible.
Innovation Solution
A method that involves acquiring the shape of the longitudinal contour of the bezel and feeling at least a part of its cross-section, with the orientation of the cross-section calculated or pointed out along the longitudinal contour, allowing for a better approximation of the 3D shape of the bezel, particularly by measuring height differences between the front and rear sides, to machine a non-uniform bevel that avoids interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reader appliance with a feeler is used to measure the bezel shape, then the measurement process can be performed, but the measurement precision is not accurate enough to make a perfect lens bevel
Solution Approach 1:
The bezel measurement is divided into multiple cross-sections along the longitudinal contour. Instead of measuring the entire bezel at once, the method selects and measures at least one cross-section (preferably two or more) at specific locations, then uses these segmented measurements to reconstruct the overall bezel shape. This segmentation allows for more accurate capture of the 3D geometry while simplifying the measurement process.
Solution Approach 2:
The method transitions from measuring only the 2D longitudinal contour to measuring the 3D cross-sectional shape of the bezel. By adding the cross-sectional dimension and measuring the height differences between front and rear sides at multiple points along the contour, the system achieves comprehensive 3D characterization of the bezel, enabling precise lens bevel machining.
2Ease of operation
If the cross-section of the bezel is measured at the bottom of the rim, then the measurement is easier to perform, but the measurement accuracy is insufficient to avoid mechanical interference
Solution Approach 1:
The method identifies and measures cross-sections at specific critical locations along the longitudinal contour where the bezel shape is most relevant for lens engagement. By selecting cross-sections at strategic positions (such as where the bezel height varies significantly), the system captures the essential geometric features needed for precise lens beveling while maintaining measurement simplicity.
Solution Approach 2:
The method performs preliminary identification and selection of the most characteristic cross-sections before actual measurement. By pre-determining which cross-sections are most important based on the longitudinal contour analysis, the system can focus measurement resources on the critical areas that will most impact lens engagement, avoiding unnecessary measurements in less critical regions.
3Device complexity
If a simple feeler device is used to measure the bezel, then the device complexity is reduced, but the measurement accuracy is limited
Solution Approach 1:
The method creates a digital model or representation of the bezel shape by measuring multiple cross-sections and longitudinal contour points. This digital copy allows for complex 3D shape analysis and lens bevel calculation without requiring complex physical measurement devices. The simplified feeler device collects sufficient data points to construct an accurate digital representation, achieving high measurement precision through computational rather than mechanical complexity.
Data Source
AI summary
The invention relates to a method for determining the shape of a bezel (16) of an eyeglass frame rim (11), comprising: —a step of acquiring the shape of a longitudinal contour of the bezel, —a step of calculating or pointing out a position (θj) of one cross-section (Sj) to be felt along said longitudinal contour, and —a step of feeling at least a part of said cross-section (Sj) by moving a mobile feeler in said bezel.