Eyeglass Lens Step Processing via Image Boundary Detection
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Solution Overview
Problem
The existing methods for attaching prescription lenses with refractive power to eyeglass frames are inefficient due to the difficulty in accurately specifying the step processing position, leading to time-consuming and error-prone processing, especially when compared to the uniform thickness of original lenses.
Innovation Solution
An eyeglass lens processing method and apparatus that involves obtaining the outline of the original lens, attaching a mark along the inner boundary of the rim, photographing the lens to extract the outline and rim boundary, and using image processing to determine the step processing shape of the prescription lens, allowing for precise processing without interference with the rim.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the step processing position is specified by measuring the groove of the rim with vernier calipers, then the measurement can be obtained, but the process is considerably time-consuming and the measurement result is easily incorrect
Solution Approach 1:
The patent replaces the mechanical measurement system (vernier calipers) with an optical imaging system. A camera captures images of the rim and lens, and image processing algorithms automatically determine the step processing position based on the captured images, eliminating manual measurement and significantly reducing processing time while improving accuracy.
Solution Approach 2:
The patent creates a digital copy of the rim and lens geometry through image capture. Instead of physically measuring the groove, the system captures an image of the rim's inner boundary and the lens outline, then processes these images to determine the step processing position, replacing physical measurement with digital image analysis.
2Ease of operation
If the step processing is performed by trial and error to insert the lens into the groove, then the lens can be attached, but the process is considerably time-consuming
Solution Approach 1:
The patent performs preliminary calculation of the step processing position before actual processing. The system calculates the optimal step position based on image data of the rim and lens, then uses this pre-calculated position to guide the step processing, eliminating the need for trial and error adjustments during the actual attachment process.
Solution Approach 2:
The patent implements a feedback mechanism where the image processing system continuously monitors the lens and rim geometry, calculates the appropriate step processing position, and adjusts the processing parameters accordingly. This closed-loop approach ensures the lens can be attached correctly without repeated trial and error attempts.
3Manufacturing precision
If the width of the peripheral edge portion of the prescription lens is greater than the width of the original lens, then the prescription lens can provide the required refractive power, but it cannot be inserted into the groove of the rim without step processing
Solution Approach 1:
The patent applies segmentation to the lens edge by creating a stepped structure. The peripheral edge portion is divided into different levels: a thicker portion that provides the required refractive power and a thinner portion that fits into the rim groove. This segmentation allows the lens to maintain its optical properties while being compatible with the rim structure.
Solution Approach 2:
The patent applies local quality by creating a step structure at specific locations on the lens periphery. The step processing is applied locally at the edge portion that interfaces with the rim, while the central and optical portions of the lens maintain their original thickness to preserve refractive power. This localized modification enables both insertion into the groove and maintenance of optical properties.
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
This method enables accurate and efficient determination of the step processing shape for prescription lenses, reducing the time and error associated with attaching them to eyeglass frames by automating the process and ensuring precise alignment.
Implementation Method 1
obtaining a lens image by photographing the detached original lens
Implementation Method 2
the outline of the lens is obtained by performing an image processing of the lens image
Implementation Method 3
a brightness change of the lens image is detected to obtain the outline of the lens based on the detected brightness change
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3C
AI summary
An eyeglass lens processing shape obtaining method for attaching a prescription lens having an edge thicker than an original lens and having refractive power to a rim of an eyeglass frame, in place of the original lens attached to the rim, the method includes: obtaining an outline of the original lens; obtaining an inner boundary of the rim on a surface of the original lens in a state where the original lens is attached to the rim; obtaining an external form processing shape of the prescription lens based on the outline of the lens; and obtaining a step processing shape of the prescription lens based on the inner boundary of the rim.