Optical Front Shell Primer Layer Impact Resistance
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Solution Overview
Problem
Existing electrically-controlled optical devices are prone to shattering upon impact, which can cause eye damage due to limitations in material choice and coatings that compromise impact resistance.
Innovation Solution
An electrically-controlled optical device with a primer layer between the functional layer and the slab, designed to withstand impact energies of at least 200 mJ, enhancing mechanical resistance without significantly increasing thickness or weight, and including features like a thin primer layer, high-temperature resistance, and specific materials such as mineral glass and sol-gel materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mineral glass is used for the optical element, then impact resistance is improved, but weight and thickness increase
Solution Approach 1:
The patent applies composite materials by combining mineral glass slab with organic coating layers (primer layer and functional layers). This composite structure allows the device to achieve the impact resistance of mineral glass while the thin organic coatings minimize additional weight and thickness, resolving the contradiction between strength and weight.
2Adaptability or versatility
If coatings are applied on the optical element surface, then functional properties are improved, but impact resistance deteriorates
Solution Approach 1:
The patent applies local quality by creating a specific layered structure where the primer layer is positioned at the critical interface between the slab and functional layers. This localized structural design ensures that the primer layer provides impact resistance at the most vulnerable point, while functional layers maintain their optical properties on the surface, thus resolving the contradiction between functional properties and impact resistance.
Solution Approach 2:
The patent uses composite materials by combining the primer layer (with adhesion promoters) and functional layers in a layered composite structure. This composite design allows each layer to perform its specific function while collectively providing both functional properties and impact resistance, resolving the contradiction between adaptability and strength.
3Weight of moving object
If the front shell thickness is reduced, then weight is decreased, but mechanical resistance to impact deteriorates
Solution Approach 1:
The patent applies composite materials by incorporating a primer layer with adhesion promoters between the slab and functional layers. This composite structure enhances the interfacial bonding strength, allowing the thin front shell (less than 1.7 mm thick) to maintain high impact resistance despite reduced thickness and weight.
4Strength
If a primer layer is added between the functional layer and slab, then impact resistance is improved, but device complexity increases
Solution Approach 1:
The patent applies the intermediary principle by introducing a primer layer as a mediator between the slab and functional layers. This primer layer contains adhesion promoters that enhance bonding at the interface, providing improved impact resistance while maintaining a simple and integrated device structure, thus resolving the contradiction between strength and device complexity.
Data Source
AI summary
An electrically-controlled optical device intended to be placed in front of a user's eye, the electrically-controlled optical device being an ophthalmic device, the electrically-controlled optical device comprising: a front shell defining a front surface and a back surface opposed to the front surface, the front shell comprising a slab, at least one functional layer arranged on the back surface and one primer layer, said primer layer being arranged between the at least one functional layer and the slab; and an electrically-controlled object facing the back surface of the front shell wherein the primer layer is conformed such that the electrically-controlled optical device is mechanically resistant to an impact energy of at least 200 mJ.