Cemented Lens Adhesive Exposure for Light Shielding Film Curing
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Solution Overview
Problem
Cemented lenses face optical defects due to low-temperature curing of light shielding films, leading to solvent infiltration, inadequate curing, and moisture issues, which affect adhesion and optical performance.
Innovation Solution
A cemented lens design where the adhesive layer is exposed between the light shielding films, allowing high-temperature curing of the films and preventing solvent infiltration and moisture buildup, thereby enhancing adhesion and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light shielding film is thermally cured at a lower temperature to prevent peeling at the cemented interface, then the adhesion between the light shielding film and the lens is improved, but the solvent in the light shielding film does not volatilize sufficiently and infiltrates the bonding adhesive layer causing discoloration and optical performance deterioration
Solution Approach 1:
The patent divides the surface into two distinct regions: a light shielding film formation region and a bonding adhesive layer formation region. By applying the light shielding film only to the peripheral region and leaving the central region exposed for adhesive application, the patent enables the light shielding film to be cured at higher temperatures without causing solvent infiltration into the adhesive layer, thus resolving the contradiction between adhesion and optical performance
Solution Approach 2:
The patent applies different properties to different regions: the peripheral region has a light shielding film with specific adhesion properties, while the central region has a bonding adhesive layer with bonding properties. This local differentiation allows each region to be optimized independently - the light shielding film can be cured at high temperature for complete solvent removal while the adhesive layer remains protected from solvent infiltration
2Manufacturing precision
If the light shielding film is thermally cured at a higher temperature, then the solvent volatilization is sufficient and adhesion is improved, but the cemented interface is easily peeled off due to difference in linear expansion coefficient between glass lens and bonding adhesive layer
Solution Approach 1:
The patent segments the surface treatment into two distinct zones: the light shielding film is applied only to the peripheral region while the central region is reserved for the bonding adhesive layer. This segmentation allows the light shielding film to undergo high-temperature curing for complete solvent removal and optimal adhesion, while the bonding adhesive layer is protected from thermal stress and solvent infiltration, preventing cemented interface peeling
Solution Approach 2:
The patent introduces a spatial separation as an intermediary solution between the light shielding film and the bonding adhesive layer. By positioning these two functional layers in different regions rather than allowing them to overlap or be in direct contact, the patent eliminates the harmful interaction between high-temperature curing and the bonding interface, thus preventing peeling while maintaining optical performance
3Object-affected harmful factors
If the light shielding film is formed to cover the end portion, then the light shielding function is improved, but moisture released from the bonding adhesive layer is hindered and dew condensation occurs at the interface causing whitening and optical performance deterioration
Solution Approach 1:
The patent segments the surface coverage into two regions: the light shielding film covers the peripheral region to provide light shielding function, while the central region remains exposed to allow moisture release pathways. This segmentation ensures that the light shielding function is maintained in the periphery while the central exposed region prevents moisture accumulation and dew condensation at the cemented interface
Solution Approach 2:
The patent applies different functional qualities to different regions: the peripheral region has light shielding properties while the central region has moisture ventilation properties. This local quality differentiation allows the light shielding film to be effective where needed without interfering with moisture release, thus preventing whitening and maintaining optical performance
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 optical defects by ensuring complete curing and adhesion of the light shielding films, maintaining optical performance even under high humidity and cleaning conditions.
Implementation Method 1
a bonding adhesive is applied to an optical effective region of the convex lens and a concave lens is bonded to the convex lens with the bonding adhesive interposed therebetween
Implementation Method 2
a black opaque light shielding layer (black coating film) is formed in a non-optical effective region (flange portion) in order to reduce internal reflection that causes ghost, flare, and the like
Implementation Method 3
in the low-temperature curing, volatilization of the solvent contained in the light-shielding film is not sufficient
Data Source
AI summary
In a cemented lens according to one aspect of the present invention, a first optical element provided with a first light shielding film and a second optical element provided with a second light shielding film are cemented by an adhesive layer, and the adhesive layer is exposed from between the first light shielding film and the second light shielding film.