Double Lens Goggle Antifogging via Segmented Polycarbonate Design
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Solution Overview
Problem
Conventional goggles and face shields with single lenses or double lenses using acryl cellulose for the inner lens suffer from inadequate antifogging properties, leading to fogging issues due to moisture absorption and permeability, especially in varying temperatures and during sports or industrial activities.
Innovation Solution
A double lens system with polycarbonate or polyurethane/polyester/polyamide resins for both lenses, where the back lens is treated with an antifogging agent and a gasket with pressure adjusting holes and breathable materials is used to maintain a controlled environment, reducing fogging and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lens structure is used, then the device complexity is reduced, but the antifogging function is insufficient
Solution Approach 1:
The single lens is divided into two separate lenses (front lens and back lens) that are arranged in parallel. The back lens specifically addresses antifogging requirements while the front lens provides protection, allowing each component to specialize in its function and thereby improving overall antifogging performance without requiring the entire system to be overly complex
Solution Approach 2:
The back lens is specifically designed with antifogging properties (using acyl cellulose resin or antifogging coating) to address the localized fogging problem that occurs on the inner surface, while the front lens maintains general protective functions. This localized application of specialized properties resolves the contradiction by targeting the specific area where antifogging is needed
2Reliability
If acyl cellulose resin is used for the back lens, then the antifogging function is improved, but the moisture permeability increases causing fogging on the front lens
Solution Approach 1:
A gasket is introduced as an intermediary component between the front lens and back lens. This gasket creates a sealed space that prevents moisture absorbed by the acyl cellulose back lens from permeating to the front lens, thereby mediating the conflict between antifogging performance and moisture permeability
Solution Approach 2:
The lens system is segmented into two independent lenses with a sealed space between them. This segmentation isolates the moisture absorption function of the back lens from the visibility function of the front lens, allowing the back lens to use hygroscopic materials without compromising front lens clarity
3Strength
If polycarbonate resin is used for the lens, then the damage-preventing function is improved, but the antifogging function is insufficient
Solution Approach 1:
Different materials are assigned to different lenses based on their specific functions. The front lens uses polycarbonate resin for impact resistance and protection, while the back lens uses acyl cellulose resin specifically for its moisture absorption and antifogging properties. This localized material assignment resolves the contradiction by allowing each lens to optimize for its primary function
Solution Approach 2:
The system uses a composite approach by combining two different resin materials (polycarbonate and acyl cellulose) in a dual-lens configuration. Each material contributes its superior properties to the overall system, creating a composite protective device that achieves both impact resistance and antifogging functionality
4Reliability
If a double lens structure is used, then the antifogging function is improved, but the device complexity increases
Solution Approach 1:
The protective device is segmented into two lenses with distinct functions. The back lens handles moisture absorption and antifogging, while the front lens provides protection. This segmentation improves antifogging performance while keeping each individual lens component relatively simple in structure
Solution Approach 2:
The two lenses are merged into a single integrated protective device with a common frame and gasket structure. This merging allows the complex dual-lens system to function as a unified whole, managing the complexity through integrated design rather than separate components
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 effectively prevents fogging in the double lens system even in cold environments and maintains high durability, ensuring clear visibility during sports and industrial activities.
Implementation Method 1
the space formed by the two lenses and the gasket functions as a temperature buffer zone, so that the cooling inside of the goggle can be moderated even if it is exposed to the cold outside air
Implementation Method 2
since they are absorbed in the propyl cellulose, fogging of the lens facing to the eyes of the double lens is less generated
Implementation Method 3
The pressure adjusting hole may be covered with a breathable member which is permeable to water vapor but impermeable to water
Data Source
AI summary
A protective device for eyes, for example, goggles of a shield, includes a double lens member, a frame member and a face fixation member. The double lens member includes a front lens, a back lens and a gasket. The front lens and the back lens are made of polycarbonate resins, polyurethane resins, polyester resins or polyamide resins. The front lens and the back lens are disposed in parallel with the gasket therebetween in order to form a space surrounded with the front lens, the back lens and the gasket. This device is excellent in the antifogging property in the double lens.