Convex Electrochromic Cell for Ophthalmic Glare Reduction
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Solution Overview
Problem
Ophthalmic electrochromic devices with flat front faces suffer from lateral luminous flux issues, limiting visual comfort, imposing unsightly frame choices, and sub-optimal performance due to inability to comply with wearer prescriptions.
Innovation Solution
An ophthalmic device featuring an electrically controllable amplitude variation cell with a convex main surface on the front face, allowing for efficient lateral light filtering and curvature to match frame shapes, ensuring optimal visual comfort and aesthetic appeal while accommodating prescriptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cell has a flat front face, then the manufacturing is simpler, but lateral luminous flux disturbs visual comfort
Solution Approach 1:
The patent applies curvature to the front face of the electrochromic cell by making the transparent layer convex. This curved surface redirects lateral luminous flux away from the wearer's eyes, eliminating glare and improving visual comfort while maintaining manufacturing feasibility through standard curving processes for ophthalmic lenses.
2Ease of manufacture
If the cell has a flat front face, then the frame choice is limited to flat shapes, but this imposes unsightly aesthetic constraints
Solution Approach 1:
The convex transparent layer can be manufactured with various curvature radii to match different frame shapes. This allows the cell to be aesthetically pleasing in curved or rounded frames while maintaining the same optical functionality, expanding frame compatibility beyond flat designs.
3Device complexity
If the cell has a flat front face, then the structure is simpler, but it cannot comply with certain ophthalmic prescriptions
Solution Approach 1:
By making the transparent layer convex with adjustable curvature, the cell can provide the necessary optical power to comply with various ophthalmic prescriptions including myopia, hyperopia, and astigmatism corrections, while adding only minimal structural complexity compared to flat designs.
4Object-affected harmful factors
If the transparent layer has convex curvature, then visual comfort is improved, but the manufacturing becomes more complex
Solution Approach 1:
The convex curvature is achieved through standard manufacturing processes for ophthalmic lenses, including curving glass or plastic substrates and applying electrochromic coatings to pre-curved surfaces. These are established industrial processes that add minimal complexity while delivering the visual comfort benefits.
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
Enhances visual comfort by reducing glare, improves aesthetics, and optimizes performance by providing a wide range of frame options and precise optical power to meet wearer prescriptions.
Implementation Method 1
a cell of the electrochromic type, connected to an amplitude variation control circuit, for example transmission in the visible spectrum
Implementation Method 2
at least one transparent layer having a convex main surface on the front face... makes it possible to increase the wearer's visual comfort... process a lateral flow RP
Data Source
Figure 1~2A
Figure 2B~3B
Figure 4~6
AI summary
The invention relates to an ophthalmic device including an electrically controllable amplitude variation cell, in particular an electrochromic transmission variation cell. More particularly, the cell (3) comprises a main convex surface on the front. This arrangement makes it possible for the cell to process a lateral luminous flux (RP), unlike cells in the prior art (1AA).