Optical Lens Surface Positioning via Marking Error Compensation
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Solution Overview
Problem
The manufacturing of optical lenses faces challenges in accurately positioning the surfaces, leading to optical errors due to the obstruction of engraved markings by adhesive tape, which hinders precise alignment on blockers.
Innovation Solution
A method that involves providing second markings on the lens surface to account for positioning errors between engraved and second markings, allowing for accurate relative positioning of the surfaces during manufacturing, using a blocker with a reference system to compensate for these errors, and configuring machining tool parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive tape is placed on the finished surface to protect it during blocking, then the lens surface is protected from damage, but the engraved markings become difficult to view and align
Solution Approach 1:
A transparent or translucent tape is used as an intermediary protective layer that allows optical transmission. This mediator protects the lens surface while permitting the engraved markings to remain visible through the tape, thus resolving the contradiction between surface protection and marking visibility.
2Strength
If the lens is blocked on the blocker using conventional materials, then the lens is securely maintained, but positioning accuracy is reduced due to inability to accurately determine lens position
Solution Approach 1:
The method implements feedback by continuously monitoring the position of engraved markings relative to blocker markings during the blocking process. This feedback mechanism allows for real-time adjustment and verification of lens positioning, ensuring accurate alignment while maintaining secure blocking.
Solution Approach 2:
Positioning adjustments are made preliminarily before final blocking is completed. The lens position is pre-adjusted based on visible marking alignment, and then secured in that position, preventing positioning errors from occurring during the blocking process.
3Strength
If conventional blocking materials are used to secure the lens, then the lens is firmly held, but optical errors are created due to inaccurate surface positioning
Solution Approach 1:
The positioning feedback system allows verification of correct lens alignment on the blocker before firm blocking is applied. By monitoring marking positions and making adjustments, the system ensures optical accuracy is achieved while maintaining secure blocking.
Solution Approach 2:
Positioning verification and adjustment are performed as preliminary actions before final secure blocking. This ensures that the lens is correctly positioned relative to the blocker markings before the blocking material is applied, preventing optical errors.
Data Source
AI summary
A method of manufacturing an optical lens, comprising: providing a lens member comprising a first surface and a first reference system identified by engraved markings on the first surface, providing surface data corresponding to a second surface of the optical lens to be manufactured, providing second markings on the lens member defining a second reference system, providing marking positioning error between the second markings and the engraved markings, providing an adhesive tape on the first surface of the lens member, and a manufacturing step during which the second surface of the optical lens is manufactured according to the surface data and the marking positioning error such that the relative position of the first and second surfaces is respected.