Porous-Coated Cemented Lens for Moisture-Resistant Light Shielding
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Solution Overview
Problem
Cemented lenses with light shielding layers formed at low temperatures are prone to moisture absorption and condensation, leading to peeling and scattering of the cementing resin layer due to drastic temperature changes, which deteriorates optical characteristics.
Innovation Solution
A cemented lens design incorporating a light shielding layer covered by a porous layer that allows moisture to be emitted into the atmosphere, preventing condensation and peeling by maintaining a stable moisture balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light shielding layer is formed by thermally curing a curable resin on a cemented lens, then stray light can be absorbed and flare/ghost can be reduced, but the cemented interface is easily peeled off due to difference in linear expansion coefficient between cementing resin and glass lens
Solution Approach 1:
The patent applies a porous layer on the light shielding layer to enable moisture emission. The porous structure allows water molecules to escape from the cemented lens system, preventing condensation and peeling of the cemented interface while maintaining the light shielding function. This resolves the contradiction by adding a moisture management function without compromising the bonding strength.
Solution Approach 2:
The patent changes the physical structure of the outer layer from dense to porous, altering its permeability parameter. This allows the system to maintain light shielding properties while enabling moisture transmission, thus preventing the peeling issue caused by thermal expansion differences and moisture accumulation.
2Manufacturing precision
If the curable resin is thermally processed and cured at high temperature for a single lens, then proper curing is achieved, but the cemented interface peels off due to thermal expansion mismatch
Solution Approach 1:
The porous layer is introduced to allow moisture emission during and after the curing process. This prevents moisture accumulation that would cause peeling at the cemented interface, enabling proper curing at elevated temperatures without compromising bonding strength.
Solution Approach 2:
The porous layer acts as an intermediary between the light shielding layer and the external environment, facilitating moisture emission. This mediator function allows the system to undergo thermal processing for complete curing while preventing the harmful effects of moisture accumulation on the cemented interface.
3Reliability
If moisture is absorbed and condensation occurs in the cemented lens, then the cementing resin layer peels and scatters, but adding a sealed structure would prevent moisture emission
Solution Approach 1:
The porous layer provides a passive moisture emission mechanism that maintains optical performance stability. The porous structure naturally allows moisture to escape without requiring active sealing or complex moisture management systems, thus maintaining reliability while keeping manufacturing simple.
Solution Approach 2:
The porous layer enables the cemented lens to self-regulate moisture content by allowing passive emission of water molecules. This self-service function maintains optical performance stability without requiring external intervention or complex manufacturing processes.
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 design enhances durability against environmental changes, preventing scattering and maintaining optical performance by ensuring the cementing resin layer remains intact.
Implementation Method 1
a porous layer covering at least a part of the light shielding layer... allowing moisture to be emitted into the atmosphere
Data Source
AI summary
A cemented lens includes a first optical element, a second optical element, a third optical element sandwiched between the first optical element and the second optical element and containing resin, a light shielding layer covering a surface of the third optical element that is in contact with neither the first optical element nor the second optical element, and a porous layer covering at least a part of the light shielding layer.