Virtual Representation Data for Spectacle Lens Contour Accuracy
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Solution Overview
Problem
Conventional methods for tracing and glazing spectacle lenses are prone to errors, leading to mechanical tension and misfitting implementation of refractive power, resulting in poor customer satisfaction and increased manufacturing costs.
Innovation Solution
A method and device for generating a set of virtual representation data of a spectacle lens using a laser scanner to scan the edge surface and a camera to take images, allowing for accurate characterization of the lens's contour, bevel, and other parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tactile tracing methods are used to determine lens shape and size, then the process is simple and equipment is basic, but the accuracy is limited and substantial uncertainty remains for determined size and shape
Solution Approach 1:
The patent replaces tactile tracing methods with optical scanning systems (laser scanners, structured light scanners, or white light scanners) to measure lens edge surfaces. This substitution eliminates mechanical contact, reducing measurement uncertainty while maintaining operational simplicity through automated digital processes.
Solution Approach 2:
The patent creates virtual copies (digital models) of the physical lens through optical scanning. These virtual representation data sets include contour information, bevel parameters, and edge surface geometry, allowing accurate measurement and validation without physical manipulation that limits tactile methods.
2Loss of information
If conventional tactile tracing is used, then equipment cost is low, but the method only provides contour information and cannot retrieve edge surface profile information
Solution Approach 1:
The patent transitions from 2D contour measurement to 3D edge surface profiling using optical scanning. The virtual representation data sets capture complete geometric information including contour, bevel height, bevel angle, and edge surface profile, providing comprehensive lens characterization in multiple dimensions simultaneously.
3Reliability
If blocking and tactile scanning processes are used, then the measurement can be performed with basic equipment, but errors are prone and mechanical tension occurs in the lens
Solution Approach 1:
The patent replaces mechanical blocking and tactile scanning with contactless optical scanning methods. Laser scanners, structured light scanners, or white light scanners capture lens geometry without physical contact, eliminating mechanical tension and blocking-related errors while maintaining measurement reliability through precise optical detection.
Solution Approach 2:
The patent creates accurate virtual copies of the lens through optical scanning, generating virtual representation data sets that preserve complete geometric information. This digital copying approach eliminates physical manipulation errors while maintaining measurement reliability through precise digital modeling.
4Measurement precision
If virtual representation data is generated through optical scanning, then measurement precision and completeness are improved, but device complexity and initial cost increase
Solution Approach 1:
The patent employs optical scanning systems that serve multiple functions: contour measurement, bevel parameter determination, and edge surface profiling. This multi-functionality consolidates what would otherwise require separate measurement devices, reducing overall system complexity despite the advanced capabilities of individual components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables precise characterization of the spectacle lens's fit for the intended frame, reduces mechanical tension, and improves manufacturing efficiency by allowing for virtual validation and predictive maintenance.
Implementation Method 1
scanning an edge surface of the spectacle lens using a laser scanner to obtain a set of scanning data of a profile of the edge surface
Implementation Method 2
taking at least one image of the spectacle lens using a camera facing a back surface or a front surface of the spectacle lens
Data Source
AI summary
Provided are a method and a device for generating a set of virtual representation data of a spectacle lens. A set of scanning data of a profile of an edge surface of the spectacle lens is obtained by scanning the edge surface using an optical scanner. Further, a set of imaging data is obtained with a camera facing a front or a back surface of the spectacle lens. Additionally, generating a set of virtual representation data of the spectacle lens is based on the set of scanning data and the set of imaging data. Further, a set of virtual representation data is provided, its use for characterizing an accuracy of fit of the spectacle lens, and/or for monitoring a manufacturing process, as well as a method for manufacturing a spectacle lens. The optical scanner is a laser scanner for scanning a height profile of the edge surface.