Displacement Prevention Coating for Lens Processing Stability
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Solution Overview
Problem
High-functionality lenses with low dynamic frictional coefficients pose challenges in lens processing due to difficulty in adhering adhesive tapes, leading to potential displacement during cutting operations, and existing solutions do not adequately address the need for a water-soluble, transparent, and non-staining coating that maintains water repellency.
Innovation Solution
A displacement prevention coating agent composed of an aqueous solution with a hydrophilic resin, a surfactant having a perfluoro group, and a particulate transparent resin composition, which forms a membrane that enhances holding stability and elasticity, preventing lens displacement during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-repellent coating layer with low dynamic frictional coefficient is formed on the lens, then water repellency and ease of wiping are improved, but adhesive tape adhesion deteriorates causing lens displacement during processing
Solution Approach 1:
A displacement prevention coating layer is formed on the lens surface before the water-repellent coating layer. This preliminary coating layer provides a base that allows adhesive tape to adhere properly while the upper water-repellent layer maintains its low friction properties. The multi-layer structure resolves the contradiction by preparing the surface in advance to accept both the adhesive tape and the water-repellent functionality.
Solution Approach 2:
The invention uses a composite coating structure with at least two layers: a displacement prevention coating layer (hydrophilic resin-based) and a water-repellent coating layer (fluorine-containing). Each layer performs its specific function - the lower layer provides adhesion for holding means while the upper layer provides water repellency and low friction, thus resolving the contradiction through material composition.
2Manufacturing precision
If a displacement prevention coating layer is formed on the lens, then holding position stability is improved, but the lens surface may become stained or opaque
Solution Approach 1:
The displacement prevention coating layer uses specific hydrophilic resins (polyvinyl alcohol, carboxymethyl cellulose, or methyl cellulose) with controlled molecular weights and saponification degrees. By carefully selecting these parameters, the coating provides sufficient adhesion for holding means while maintaining transparency and avoiding staining. The coating is also designed to be removable after processing.
Solution Approach 2:
The displacement prevention coating is applied only to specific areas of the lens where holding means will contact (typically the periphery or specific zones), rather than uniformly across the entire surface. This localized application maintains optical quality in the visual area while providing holding stability where needed.
3Ease of manufacture
If the displacement prevention coating is made water-soluble, then ease of removal after processing is improved, but coating stability during processing may deteriorate
Solution Approach 1:
The displacement prevention coating uses hydrophilic resins that are water-soluble, allowing the coating to transition from a stable film during processing to a removable state when exposed to water after processing. The coating maintains its structural integrity during the lens shaping process but can be easily washed away with water afterward, resolving the contradiction between stability and ease of removal.
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 coating agent effectively prevents lens displacement during processing by forming a stable, transparent, and water-soluble membrane that maintains water repellency and transparency, ensuring accurate lens shaping without compromising the lens's optical properties.
Implementation Method 1
A surface tension on a water-repellent lens surface is lowered to show sufficient wettability
Implementation Method 2
A surface tension on a water-repellent lens surface is lowered to show sufficient wettability
Implementation Method 3
an aqueous solution whose main components are a hydrophilic resin
Implementation Method 4
a particulate transparent resin composition that is insoluble in water and exhibits a transparent appearance at least after the formation of the membrane
Data Source
AI summary
[Problem to be Solved] A displacement prevention coating agent is provided which can prevent a displacement in lens processing, which is soluble in water and which exhibits a transparent appearance at least after being cured. [Solution] There is provided a displacement prevention coating agent with which the front and rear surfaces of a lens are coated so that when cutting processing is performed on an end surface of the lens where, for example, a water-repellent coat layer is formed as a membrane such that the end surface has a shape corresponding to a frame, a holding position of the front and rear surfaces of the lens held by a chuck device is prevented from being displaced, where the displacement prevention coating agent is formed of an aqueous solution whose main components are a hydrophilic resin, a surfactant having a perfluoro group and an emulsion and exhibits a transparent appearance at least after the formation of the membrane. Such a displacement prevention coating agent is used when the front and rear surfaces of a lens where for example, a water-repellent coating layer is formed as a membrane are chucked and held with a chuck device to which an adhesive tape is adhered, and thus when the lens is processed, a holding position held by the adhesive tape of the lens is unlikely to be displaced.