Spectacle Lens Edge Simulation Tool for Frame Groove Fitment

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Existing methods for measuring the fitment of a lens edge profile with respect to a frame groove profile in spectacle frames are complex, require specific and costly machines, and often result in deficient products due to inaccuracies in measuring the offset between the lens edge and the frame groove.

Innovation Solution

A lens edge simulation tool with a defined edge profile and a moveable probe is used to simulate the lens edge profile and directly measure the offset between the lens edge and the frame groove, allowing for accurate compensation and alignment without the need for additional calibration steps or complex machines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a mechanical probe tracer is used to measure the frame groove periphery, then the frame groove data can be retrieved, but the measurement precision is insufficient due to the offset between measuring the bottom of the groove and the top of the bevel

Engineering Contradiction:
Improveframe groove measurement precisionVSAvoidlens edge fitment precision
Core Design Contradiction:
Measurement precisionVSManufacturing precision

Solution Approach 1:

The patent creates a digital copy (3D model) of the frame groove profile from physical measurements, then uses this digital model to simulate and calculate the precise positioning of the lens bevel relative to the groove bottom. This copying approach allows the system to overcome the physical limitation of probe measurement by performing virtual measurements and offset calculations on the digital model, thereby achieving precise fitment without requiring direct physical measurement at the exact bevel location.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The patent replaces the purely mechanical probe measurement system with a hybrid system that combines mechanical data collection with computer-based simulation and calculation. The physical tracer collects raw data, but the precise positioning is achieved through software algorithms that simulate the lens-bevel interaction and calculate the required offset, substituting mechanical measurement limitations with computational precision.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If physical or digital methods with V-shaped measuring tools are used to define lens edge positioning, then the most protruding area can be positioned, but additional calibration steps and reference surfaces are required

Engineering Contradiction:
Improvelens edge positioning precisionVSAvoidmeasurement system complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent makes the measurement system self-sufficient by integrating all necessary measurement and calculation functions into a unified software platform. The system automatically performs the offset calculations between groove bottom and bevel top positions using the 3D model, eliminating the need for separate calibration steps and reference surfaces. The software handles the complex geometric relationships internally, making the process self-contained and reducing external dependencies.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent creates a universal measurement and simulation system that can handle various frame groove geometries and lens types through a single integrated platform. The 3D modeling and simulation software can accommodate different groove profiles, bevel angles, and lens configurations without requiring dedicated calibration procedures for each case, making the system multi-functional and adaptable to diverse applications.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Measurement precision

If special machines with additional features are used to measure frame groove profile, then accurate offset measurement is possible, but the device cost and complexity increase significantly

Engineering Contradiction:
Improveoffset measurement precisionVSAvoidmachine complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts the complex calculation and simulation functions from the physical measurement machine and places them in a separate computer-based software environment. The measurement machine itself remains relatively simple, collecting only the basic geometric data, while the sophisticated offset calculations, 3D modeling, and fitment simulation are performed by standalone software, separating measurement from complex processing.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a computer-based simulation environment as an intermediary between the simple physical measurement and the final lens manufacturing. This intermediary software layer processes the raw measurement data, creates 3D models, performs offset calculations, and generates manufacturing instructions, acting as a mediator that bridges the gap between simple measurement and precise manufacturing without requiring the measurement hardware itself to be complex.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS12287534B2Spectacle lens edge simulation tool and method for defining a lens shape with said tool
Publication Date: 2025.04.29 MEI SRL
  • US12287534B2 patent drawing
  • US12287534B2 patent drawing
  • US12287534B2 patent drawing

AI summary

The present invention relates to a lens edge simulation tool (10) for measuring the fitment of a lens edge profile (LEP) with respect to a frame groove profile (FGP) of a spectacle frame (20), the lens edge simulation tool (10) having a defined edge profile (STP) like a lens edge profile (LEP) of a lens (6) being machined by a defined edger machine (4), the defined edge profile (STP) comprising a bevel portion (11) protruding towards a protrusion direction (A), wherein the lens edge simulation tool (10) further comprises a probe (15) provided at a distal end tip portion (14) of the bevel portion (11) and being moveable (M) along the protrusion direction (A) between a retracted position in which the probe (15) does not protrude from the defined edge profile (STP) and an extension position in which the probe (15) protrudes from the distal end tip portion (14). The present invention further relates to a system (1) and method for defining a lens shape for a machined lens (6) adapted to fit into a frame groove (21) of a spectacle frame (20).