Loupe Tube Framework Acetone Resistance UV Adhesive Bonding
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Solution Overview
Problem
Current loupe systems for medical professionals face issues with aged deterioration and acetone resistance, leading to misalignment and insufficient holding force due to materials like polycarbonate and ABS, which are not suitable for medical applications due to water absorption and anisotropic shrinkage.
Innovation Solution
A loupe system with a tube framework made from materials like polycarbonate or ABS, coated with a two-component acrylic urethane paint and an acetone-resistant UV paint, ensuring durability and easy readjustment by applying a UV adhesive that can be removed with acetone without damaging the framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polycarbonate or ABS materials are used for tube framework, then acetone resistance is improved, but aged deterioration increases due to material solubility
Solution Approach 1:
The patent uses a composite structure combining polycarbonate or ABS tube framework with a UV-cured adhesive coating. The framework material provides acetone resistance while the UV-cured adhesive layer prevents aged deterioration by creating a protective barrier that maintains bonding strength over time, resolving the contradiction between acetone resistance and aging resistance through material composition.
2Object-affected harmful factors
If PPS or PBT materials are used for tube framework, then acetone resistance is improved, but water absorption increases causing dimensional variation
Solution Approach 1:
The patent changes the material parameter from PPS/PBT to polycarbonate or ABS, which have lower water absorption characteristics. This parameter change maintains acetone resistance while significantly improving dimensional stability, preventing the warping and optical axis deviation that occur with high water absorption materials during sterilization processes.
3Object-affected harmful factors
If PPS or PBT materials are used for tube framework, then acetone resistance is improved, but manufacturing precision decreases due to anisotropic shrinkage
Solution Approach 1:
The patent changes the material parameter from PPS/PBT to polycarbonate or ABS, which exhibit isotropic or near-isotropic shrinkage characteristics during molding. This parameter change eliminates the anisotropic shrinkage problem, enabling high-precision manufacturing of the tube framework while maintaining acetone resistance.
4Object-affected harmful factors
If PPS material is used for tube framework, then acetone resistance is improved, but bonding strength decreases with UV adhesive
Solution Approach 1:
The patent creates a composite system where polycarbonate or ABS tube framework is bonded with UV-cured adhesive. This combination provides superior bonding strength compared to PPS, while the UV-curing process creates a strong chemical bond that maintains holding force even after prolonged use and exposure to cleaning agents.
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 provides a loupe system with improved acetone resistance and reduced aged deterioration, allowing for precise alignment and secure bonding without compromising the material's integrity, enabling reliable and long-lasting performance in medical settings.
Implementation Method 1
The UV adhesive, which is cured by irradiation with UV light, enables the processing time to be reduced compared to instant adhesives.
Implementation Method 2
In order to completely remove the solidified UV adhesive, acetone is often used as a stripper. Although the UV adhesive is effectively removed by acetone wiping, some resins are soluble in acetone.
Data Source
AI summary
A loupe is bonded to a glasses-type holder to be worn around a head of a user. The loupe includes: a tube framework inserted into a hole or a cutout formed in the glasses-type holder and bonded with a UV adhesive; and a lens held in the tube framework. At least a portion at which the UV adhesive is applied in the tube framework is made of a resin not resistant to acetone and is covered with a paint resistant to acetone.