Optical Lens Surface Determination for Spectacle Frame Fit
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Solution Overview
Problem
The existing methods for determining the surface of optical lenses to fit spectacle frames often result in deformation of the frame, which can alter its size, introduce mechanical stress, and affect the aesthetics, as they do not adequately consider the shape of the frame's contour, leading to suboptimal fitting and increased risk of lens damage.
Innovation Solution
A method that uses computer means to determine the surface of an optical lens by providing contour data and target curvature data, minimizing the difference between the frame's contour and the lens's periphery contour, ensuring a precise fit while considering both optical and esthetic criteria, through a process involving contour and curvature data analysis and optimization techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens surface is determined based on optical criteria and frame measurements, then the lens can be edged and beveled to fit the frame, but the frame may be deformed altering its size and aesthetics
Solution Approach 1:
The patent applies preliminary action by determining the lens surface in advance with consideration of the frame contour before edging and beveling operations. The method calculates the optimal lens surface geometry beforehand, incorporating frame shape data into the surface determination process, so that subsequent edging and beveling can be performed without deforming the frame.
Solution Approach 2:
The patent utilizes parameter changes by modifying the lens surface parameters (curvature, asphericity) based on the frame contour parameters. The method adjusts the lens surface geometry to match the specific frame shape, allowing the lens to fit the frame without requiring frame deformation. This involves changing the surface curvature distribution to accommodate the frame's specific contour characteristics.
2Adaptability or versatility
If the lens contour is adjusted to fit the frame, then the lens can be mounted in the frame, but mechanical stress is introduced increasing the risk of lens damage
Solution Approach 1:
The patent applies preliminary action by calculating the optimal lens contour and surface geometry before the edging process. The method determines the lens parameters in advance based on frame measurements, ensuring that the lens is pre-configured to fit the frame without requiring excessive force or deformation during mounting, thereby reducing mechanical stress and maintaining lens integrity.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the lens contour parameters and surface curvature distribution to match the frame geometry. By adjusting these parameters beforehand, the lens achieves better adaptability to the frame shape without introducing harmful mechanical stress during the mounting process.
3Ease of manufacture
If traditional edging and beveling methods are used, then the lens can be fitted to the frame, but the process is time-consuming and may deform the frame
Solution Approach 1:
The patent applies preliminary action by determining the lens surface and contour parameters before the edging and beveling operations. This pre-calculation of optimal lens geometry based on frame measurements allows for more efficient manufacturing processes, reducing the time required for edging and beveling while minimizing frame deformation risks.
Solution Approach 2:
The patent replaces traditional mechanical trial-and-error fitting methods with a computational approach. By using computer-based calculations to determine the optimal lens surface and contour, the method eliminates time-consuming manual adjustments and frame deformation issues associated with traditional mechanical fitting processes.
Data Source
AI summary
Method for determining a surface of a face of an optical lens to be mounted to a spectacle frame, the method comprising: a contour data providing step (S1), during which contour data representing a contour of the spectacle frame is provided, a target curvature data providing step (S2) during which target curvature data representing the target curvature of the surface to be determined over an evaluation zone of said surface is provided, an optical surface determining step (S3), during which a surface is determined so as to minimize: the difference between the target curvature and average curvature of the surface over the evaluation zone, and the difference between the contour of the spectacle frame and the periphery contour of the surface, the periphery contour of the surface corresponding to the contour of the surface to be determined of the optical lens after the optical lens has been edged to be mounted in the spectacle frame.