Multifocal Spectacle Lens with Overlapping Near-Lens Positioning
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Solution Overview
Problem
Existing spectacle lenses with joined near and distance lenses at their cross sections suffer from reduced wearability due to a conspicuous joint, limited segment positioning freedom, increased inventory, and impaired appearance, necessitating separate semi-finished lenses with segments.
Innovation Solution
A multifocal spectacle lens design featuring a first lens covering an opening in a second lens, allowing for high freedom in positioning a near portion and reducing inventory by overlapping lenses in the optical axis direction without conventional segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If near and distance lenses are joined at their cross sections, then the spectacle lens can provide both near and distance vision, but the joined portion becomes conspicuous and impairs appearance
Solution Approach 1:
The patent transitions from joining lenses laterally (in the horizontal plane) to stacking lenses in the optical axis direction (vertical dimension). This dimensional change allows the near lens to be positioned behind the distance lens, making the junction invisible from the front view while maintaining both near and distance vision capabilities.
2Adaptability or versatility
If segments are formed in advance on semi-finished lenses, then near portions can be realized, but the position of segments cannot be changed and inventory increases
Solution Approach 1:
The patent divides the multifocal lens into separate distance lens and near lens components that can be independently manufactured and then combined. This segmentation allows flexible positioning of the near portion after manufacturing without requiring pre-formed segments, thereby maintaining positioning freedom while simplifying inventory management.
Solution Approach 2:
The patent enables dynamic repositioning of the near portion by using a modular design where the near lens can be adjusted along the optical axis and horizontally after manufacturing. This dynamic capability eliminates the need for multiple pre-configured semi-finished lens types with fixed segments.
3Adaptability or versatility
If lenses are joined at cross sections, then multifocal vision is achieved, but the joined portion is present along the light beam traveling direction reducing wearability
Solution Approach 1:
The patent repositions the lens junction from the horizontal plane (affecting light path) to the vertical dimension along the optical axis. This places the joining portion behind the pupil plane, making it invisible to the wearer and eliminating the visual disruption that reduces wearability.
Data Source
AI summary
A spectacle lens in which a region with a specific optical function has a high degree of freedom, and that has a better appearance and a better field of view compared to those achieved when lenses are joined at their cross sections. A spectacle lens and a technique associated therewith, the spectacle lens including a first lens and a second lens that are arranged overlapping each other in an optical axis direction, wherein the second lens has an opening, and the first lens covers the opening.