Eyeglass Lens Bevel Locus Adjustment for High Curve Frames
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Solution Overview
Problem
Existing methods for setting bevels on eyeglass lenses are not suitable for high curve frames, resulting in poor appearance and difficulty in forming bevels that consider the tilt state of these frames.
Innovation Solution
An eyeglass lens processing apparatus that includes an edge position detector, mode selector, bevel locus setting unit, and controller to determine and adjust the bevel apex positions and slopes for both the front and rear surfaces of the lens, ensuring a balanced and aesthetically pleasing bevel formation by shifting the bevel apex positions based on the frame's tilt angle and edge thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional bevel setting methods are used for high curve frames, then the bevel can be formed following standard procedures, but the bevel appearance becomes poor due to excessive bevel slopes on front or rear surfaces
Solution Approach 1:
The patent changes the bevel locus parameters by tilting the curve based on frame tilt angle. The bevel locus is adjusted from a standard curve to a tilted curve that compensates for the frame's high curve degree, ensuring balanced bevel slopes on both front and rear surfaces. This parameter adjustment resolves the contradiction by maintaining ease of manufacture while improving bevel appearance quality.
Solution Approach 2:
The patent performs preliminary calculation of the tilted bevel locus before actual bevel formation. The control unit calculates the appropriate bevel locus that accounts for frame tilt angle and high curve degree in advance, then guides the beveling tool along this pre-calculated path. This preliminary action ensures the bevel is formed correctly from the start, avoiding the need for corrective adjustments and ensuring good appearance.
2Manufacturing precision
If the known method of tilting the bevel locus is applied to high curve frames, then some adjustment can be made to excessive lens edge portions, but it is still not possible to appropriately form the bevel considering the tilt state and it becomes troublesome to form the bevel
Solution Approach 1:
The patent creates a universal bevel locus calculation method that automatically adapts to different frame types including high curve frames. The control unit uses the same basic calculation procedure but adjusts parameters based on input frame characteristics. This multi-functional approach allows the system to handle various frame types without requiring separate complex procedures, reducing operational complexity while maintaining precision.
Solution Approach 2:
The patent incorporates feedback by using the measured frame tilt angle and high curve degree information to automatically adjust the bevel locus. The operator inputs frame characteristics, and the control unit uses this feedback to calculate the appropriate tilted bevel locus. This closed-loop approach ensures accurate bevel formation without requiring manual trial and error, reducing complexity while maintaining precision.
3Ease of operation
If standard bevel setting is used without considering frame tilt angle, then the bevel can be formed following simple procedures, but the bevel slopes appear excessive on front or rear surfaces resulting in poor appearance
Solution Approach 1:
The patent performs preliminary calculation of the tilted bevel locus based on frame tilt angle before the actual beveling operation. The control unit calculates the adjusted bevel path that compensates for tilt, then guides the tool along this pre-determined path. This preliminary action maintains ease of operation by automating the calculation while ensuring precise bevel slope balance on both surfaces.
Solution Approach 2:
The system performs self-adjustment by automatically calculating the tilted bevel locus based on input frame parameters. The operator simply inputs frame characteristics, and the control unit self-adjusts the bevel locus without requiring manual intervention or complex operator skills. This self-service approach maintains ease of operation while achieving precise bevel slope balance.
Data Source
AI summary
An eyeglass lens processing apparatus includes: an edge position detector which detects front and rear edge positions of an eyeglass lens based on target lens shape data; a bevel locus setting unit which includes: a) a provisional bevel locus calculator which obtains a provisional bevel locus by obtaining a bevel curve substantially equal to a frame curve; b) a nose-side bevel position determining unit which determines a corrected bevel apex position at a nose-side edge position; c) an ear-side bevel position determining unit which determines a corrected bevel apex position at an ear-side edge position; and d) a corrected bevel locus calculator which obtains a corrected bevel locus which has a curve value equal to the bevel curve; and a processing controller which obtains beveling information based on the corrected bevel locus and controls an operation of the apparatus according to the beveling data.