Adjustable Power Lens Assembly With Reduced Edge Distraction
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Solution Overview
Problem
Existing glasses with adjustable optical power lenses do not effectively minimize distraction and provide optimal centration for near and distant vision, often exposing visible edges of movable lens elements, and lack efficient mechanisms for cleaning and assembly.
Innovation Solution
The glasses feature two superposed lens elements with one being slidably mounted and the other immovable, aligned to minimize visible edges during power adjustment, and a detachable frame part for easy cleaning, using spring-loaded guides and alignment features for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical power of the lens is increased for near vision, then the corrective power for near vision is improved, but the lens edges become more visible and distracting
Solution Approach 1:
The lens elements are made movable relative to each other along the optical axis, allowing dynamic adjustment of the lens configuration. When optical power is increased for near vision, the lens elements can be positioned to reduce edge visibility, and when optical power is decreased, the elements return to a position that minimizes distortion. This dynamic positioning resolves the contradiction between providing high corrective power and minimizing visual distraction from lens edges.
2Reliability
If the lens elements are positioned to maximize optical power, then near vision correction is improved, but the centration distance does not align with the user's interpupillary distance
Solution Approach 1:
The system allows continuous adjustment of the relative position of lens elements along the optical axis, changing the optical parameters to match the user's specific interpupillary distance. By varying the centration distance parameter independently of the optical power, the system can achieve both high corrective power and precise alignment with the user's anatomical features, resolving the contradiction between maximizing optical power and maintaining proper centration alignment.
3Ease of manufacture
If a fixed lens design is used, then the manufacturing process is simplified, but the lens cannot adapt to different viewing distances and user needs
Solution Approach 1:
The lens is divided into multiple separate lens elements that can be independently manufactured and then assembled. This segmentation allows each element to be optimized for specific optical functions while maintaining relative simplicity in individual element manufacturing. The modular design provides adaptability for different viewing distances through the adjustable mechanism, resolving the contradiction between manufacturing simplicity and functional versatility.
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
The solution provides minimal edge distraction during power adjustment, optimal centration for near and distant vision, and facilitates easy cleaning and assembly, enhancing user experience and functionality.
Implementation Method 1
the lens elements being slidable relative to each other in a direction transverse the optical axis of the lens under the control of the optical power adjuster
Implementation Method 2
having respective lens surfaces that are shaped to act together to form a corrective lens, the power of which varies according to the relative disposition of the two lens elements
Data Source
AI summary
A method of fabricating a lens element for an adjustable power lens of the kind comprising two lens elements that are slidable relative to one other in a direction transverse the optical axis of the lens and have respective lens surfaces that are shaped to act together to form a corrective lens, the power of which varies according to the relative disposition of the two lens elements, the method comprising the steps of forming a lens puck having two opposite faces, which are shaped to form opposite lens surfaces of one of the lens elements of the adjustable power lens, the puck having at least one alignment feature, and thereafter edging the puck to a desired eye shape with reference to the alignment feature.