Adjustable Eyeglass Tracking Device for Precise Morpho-Geometric Measurement
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Solution Overview
Problem
Existing tracking devices for spectacle frames have a fixed geometry, making them inflexible and prone to significant errors in measuring morpho-geometric parameters, as they cannot accurately adapt to frames of different shapes and sizes, leading to imprecise positioning and measurements.
Innovation Solution
A tracking device with movable fixing members and adjustable lateral lever arms that can adapt to various frame geometries, ensuring precise positioning close to the lens plane, and featuring visible markers for easy identification on images or films, allowing for accurate representation of the frame in space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tracking device with fixed geometry is used, then the device structure is simple, but the device cannot adapt to frames of different shapes and sizes, leading to significant positioning errors
Solution Approach 1:
The tracking device incorporates movable fixing members that can slide along guideways on the transverse bar, allowing the device to dynamically adjust its geometry to match different frame shapes and sizes. This dynamic adjustment capability enables the device to maintain proper positioning on various frames without requiring multiple fixed-geometry devices
Solution Approach 2:
The fixing members are separated into independent components that can move relative to each other along the transverse bar. This segmentation allows each fixing member to independently adjust to the specific geometry of the frame, providing versatility while keeping each individual component relatively simple
2Measurement precision
If a tracking device with fixed connection means is used, then the device is easy to manufacture, but the device ends up offset with respect to the frame, inducing substantial measurement errors
Solution Approach 1:
The movable fixing members allow the tracking device to be precisely positioned on the frame by sliding to the correct location, ensuring accurate measurement positioning. The guideways constrain the movement to ensure proper alignment while allowing adjustment to different frame geometries
Solution Approach 2:
The fixing members are designed to self-adjust to the frame geometry through the sliding mechanism, reducing the need for complex precision manufacturing. The guideways provide natural alignment constraints that simplify the manufacturing requirements while ensuring accurate positioning
3Ease of operation
If a tracking device is used to facilitate three-dimensional tracking, then the measurement process is improved, but the device must be precisely positioned at pupil level, which is difficult with fixed geometry
Solution Approach 1:
The movable fixing members enable operators to easily adjust the tracking device to different frame geometries and sizes, simplifying the setup process. The sliding mechanism allows quick repositioning to achieve accurate pupil-level alignment without requiring complex calibration procedures for each different frame type
Data Source
Figure 1~2b
Figure 2c~4
Figure 5a~5c
AI summary
The invention relates to a referencing device (1, 100) intended to be fixed to an eyeglass frame in order to spatially reference said frame, said device (1, 100) having a transverse bar (2, 102), a central extension (5), two lateral markers (3) and a central marker (4), each marker (3, 4) consisting of a light area (12) and a darker area (11). The main characteristic of a clip according to the invention is that it comprises at least one mobile fastening member (7, 8) which is able to move along at least one slide (9, 10) of the bar (2, 102).