Eyeglass Lens Shaft Alignment Positioning to Avoid Hole Overlap
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Solution Overview
Problem
Existing shaft alignment apparatuses for eyeglass lenses often result in defects due to interference between the lens holding shaft and the hole forming device, particularly when the shaft alignment position is at the geometric center, leading to inappropriate hole formation due to overlapping with processing inappropriate regions.
Innovation Solution
A shaft alignment apparatus that sets the shaft alignment position based on acquired hole arrangement information and processing inappropriate region data, ensuring the position is not at the geometric center if the inappropriate region overlaps with the hole, thereby preventing interference and ensuring accurate hole formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the shaft alignment position is set at the geometric center of the target lens shape, then the lens holding shaft is positioned at the center for stable processing, but the processing inappropriate region overlaps with the hole formation position causing defects
Solution Approach 1:
The patent applies asymmetry by deliberately positioning the shaft alignment position off-center relative to the geometric center of the target lens shape. The controller calculates a shaft alignment position that intentionally creates asymmetric positioning to ensure the processing inappropriate region does not overlap with the hole formation position, thereby resolving the contradiction between central stability and hole formation precision.
Solution Approach 2:
The patent changes the positional parameter of the shaft alignment position from the conventional geometric center to a calculated optimal position. The controller computes the shaft alignment position based on lens shape information and processing inappropriate region data, dynamically adjusting the position parameters to avoid overlap with the hole formation position while maintaining processing stability.
2Manufacturing precision
If the shaft alignment position is shifted from the geometric center to avoid the processing inappropriate region, then hole formation precision is improved, but the shaft alignment position becomes asymmetric requiring complex calculation
Solution Approach 1:
The system performs self-service by automatically calculating the optimal shaft alignment position through the controller. The controller acquires lens shape information and processing inappropriate region data, then autonomously computes the appropriate shaft alignment position without requiring manual intervention or complex external calculations, simplifying the overall system operation.
Solution Approach 2:
The patent applies preliminary action by calculating and determining the optimal shaft alignment position before the actual hole formation process begins. The controller pre-computes the shaft alignment position based on the lens shape and processing constraints, ensuring that the position is optimized in advance to prevent overlap with the hole formation position, thereby simplifying the subsequent processing steps.
Data Source
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AI summary
A shaft alignment apparatus sets a shaft alignment position (45), which is a mounting position with respect to an eyeglass lens (LE), of a lens holding shaft that holds the eyeglass lens (LE) interposed therein during the processing of the eyeglass lens (LE). A controller of the shaft alignment apparatus sets a shaft alignment position (45), other than at a geometric center (GC)of a target lens shape (60) to be processed, at which a processing inappropriate region (50) in the vicinity of the shaft alignment position (45) and the position of a hole (43) to be formed do not overlap each other, in at least a portion of cases where the shaft alignment position (45) is set with respect to the eyeglass lens (LE) having a hole formed through a lens surface thereof.